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Brief introduction of LG series centrifugal scraper thin film evaporator
2022 / 04 / 21
Overview The scraped film evaporator is a high-efficiency evaporation and distillation equipment that uses high-speed rotation to distribute the liquid into a uniform film for evaporation or distillation. It can also perform unit operations such as deodorization, defoaming reaction, heating and cooling. , Western pharmaceutical, food, light industry, petroleum, chemical, environmental protection and other industries. Performance and Features LG series centrifugal scraper thin film evaporator adopts centrifugal sliding groove rotor. It is a new structure evaporator in foreign countries. It can also form a thin film under the condition of small flow rate. The material can be quickly removed by the movable scraper. Compared with the fixed-gap scraper evaporator, the evaporation can be increased by 40-69%. It has the following performance and characteristics: 1. LG series centrifugal scraper thin film evaporator has high heat transfer coefficient value, large evaporation capacity, evaporation intensity can reach 200kg/m2·hr, and high thermal efficiency. 2. The heating time of the material is short, about 5 seconds to 10 seconds, and it works under vacuum conditions, which is more beneficial to heat-sensitive materials, keeping various components without any decomposition, and ensuring product quality. 3. Adapt to a wide range of viscosity changes, both high and low viscosity materials can be processed, and the material viscosity can be as high as 100,000 centipoise (CP) 4. Changing the rotation direction of the scraper groove can adjust the treatment time of the material in the evaporator. 5. The inner wall of the cylinder of the evaporation section is precisely boring and polished, and the surface is not easy to produce coking and scaling. 6. Easy to operate, easy to adjust product indicators, under closed conditions, it can carry out continu
A brief introduction to the float valve
2022 / 04 / 20
The floating valve can float on the tray and change its opening degree with the change of gas flow. There are many types of float valves, such as round valves and strip angle valves. China mainly uses the circular valve. Among them, the most commonly used is the F1 type, which has been issued by the domestic ministry of standards (JB1118). The standard stipulates that the material of the valve body can be carbon steel, stainless steel or acid-resistant steel; the thickness of the light valve is 1.5mm and the weight is about 25g, and the thickness of the heavy valve is 2mm and the weight is about 33g. The float valve is fixed at the desired height on the vessel wall and connected to the supply line. When the liquid level rises, the float rises and closes the valve through the lever arm. When the liquid level drops, the supply line opens and the medium flows in until the respective liquid level is reached again. Application areas: industrial water treatment, chemical processing industry In some practical applications, the strip type float valve is better than the F1 type float valve for the following reasons: 1. The strip type float valve has been widely used, and the similar ones are also the guide float valve, etc. 2. The separation efficiency is relatively high 3. The most practical advantages for users: compared with traditional float valves, it is not easy to fall off and not easily get stuck 4. The processing capacity is more than 20% higher than that of the F1 type float valve 5. The leakage, pressure drop and efficiency of the tray are comparable to those of the F1 type float valve
Introduction to the split cylinder
2022 / 04 / 19
The sub-cylinder, also known as the sub-air bag, is widely used in petrochemical, power generation, steel, cement, construction and other industries, and is an indispensable auxiliary equipment for steam boilers. Sub-cylinder performance structure The sub-cylinder is the key supporting facility equipment of the heating furnace, which is used to distribute the steam that needs to be generated during the operation of the boiler to each pipeline. The main function of the sub-cylinder is to distribute steam, which is a high-pressure container, and the sub-cylinder is a pressure-bearing mechanical equipment. Therefore, the sub-cylinder is equipped with several high-pressure gate valves to connect the main steam valve and the steam gate valve of the heating furnace, so that the steam of the sub-cylinder can be distributed to the required places. The main pressure components of the sub-cylinder are: steam distribution valve seat, relief valve seat, pressure gauge valve seat and thermometer valve seat. Shell, head and flange material Q235-A/B, 20g, 16MnR, working pressure 1-2.5MPa, specification ф159-ф1500, working temperature 0-400℃, working medium is hot and cold water, steam and compressed air. Sub-cylinder technical indicators According to the design of the "Pressure Vessel Regulations", when the medium is steam, determine the material, thickness and diameter of the cylinder. Generally, it can be determined according to the flow rate of the fluid in the cylinder. The diameter of the cylinder should be 2-2.5 times the maximum diameter of the connecting pipe. 16MnR sheet should be rolled up, 10-20# seamless pipe, Q235B, 20g, the number of connecting pipes is determined by engineering design. Equipment specifications: The specifications of the cylinders are DN200-DN1200, and the actual vessel capacity is determined by the customer. The design concept temperature is less than 350 ℃, the design concept working pressure is usually 1.43
Classification and brief introduction of flanges
2022 / 04 / 19
Flange basic introduction Flange, also known as flange flange or flange. Flanges are the interconnected parts between shafts and are used for the connection between pipe ends; they are also used as flanges on the inlet and outlet of equipment for the connection between two equipment, such as reducer flanges. Flange joint is an appliance used for flange sealing. 1. Application: Flange joint is a kind of component that is extremely commonly used in engineering design and involves a wide range of surfaces. It is an essential part of piping design, pipe fittings and valves, and an essential component of equipment and equipment parts (such as manholes, sight glass level gauges, etc.). In addition, other professions such as industrial furnaces, thermal engineering, water supply and drainage, heating and ventilation, automatic control, etc., also often use flange joints. 2. Material: Forged steel, WCB carbon steel, stainless steel, 316L, 316, 304L, 304, 321, chrome molybdenum steel, chrome molybdenum vanadium steel, molybdenum titanium, rubber-lined, fluorine-lined material. 10 Flange Types and Features 1. Plate flat welding flange Plate type flat welding flange (chemical standard HG/T20592, national standard GB/T9119, mechanical JB/T81). advantage: The material is convenient to obtain, the manufacture is simple, the cost is low, and the utility model is widely used. shortcoming: The rigidity is poor, so it should not be used in chemical process piping systems with supply and demand, flammable, explosive and high vacuum requirements and in highly and extremely hazardous occasions. 2. Flat welding flange with neck Flat welding flange with neck belongs to the national standard flange standard system. It is one of the manifestations of national standard flange (also known as GB flange). advantage: On-site installation is more convenient, and the
Introduction to vacuum distillation column
2022 / 04 / 18
Vacuum distillation is a very common unit operation used in the petrochemical and pharmaceutical chemical industries. A distillation column capable of vacuum distillation operation is called a vacuum distillation column. Vacuum distillation is a very common unit operation used in the petrochemical and pharmaceutical chemical industries. Vacuum operation can reduce the bubble point and dew point of the operating materials in the tower, and reduce the chances of some materials, especially heat-sensitive materials, chemically reacting at high temperatures to produce impurities. For example, the separation of ethylbenzene and styrene under normal pressure is easy to produce heavy tar in the tower still. Vacuum distillation can reduce impurities and improve the product purity of styrene. Another example is the vacuum distillation of crude oil, which can reduce the thermal decomposition of residual oil and improve the quality of gas oil. The reduction of the bubble point of the column still helps to choose a conventional heating method to heat the column still. At low pressure, the relative volatility of some materials will also increase, which will improve the separation effect. Through the use of vacuum distillation column, compared with atmospheric distillation, the difference in boiling point and relative volatility of materials under different vacuum degrees can be used to improve the separation effect. Vacuum distillation technology can also be applied to the separation of azeotropes, high efficiency and energy saving. Compared with atmospheric distillation, the disadvantage of vacuum distillation is that the investment and operating costs are larger, especially with the increase of vacuum degree, the investment cost will even increase exponentially. Through the rational design of the vacuum system at the top of the distillation column, including the selection of vacuum equipment, the design of condenser, pressure control and p
A brief introduction to the distillation column
2022 / 04 / 16
Distillation tower is a chemical equipment made of rare metal titanium and other materials and its alloy materials. It has the characteristics of high strength, high toughness, high temperature resistance, corrosion resistance and light specific gravity. Therefore, it is widely used in chemical industry, petrochemical industry, metallurgy, light industry, textile industry, etc. , alkali production, pharmaceuticals, pesticides, electroplating, electronics and other fields. Principle and Classification There are many kinds of tower equipment, and the distillation tower is a tower-type gas-liquid contact device for distillation. There are two main types of tray towers and packed towers. The comparison between tray towers and packed towers is a complex issue, involving many factors. Material properties, operating conditions, performance of tower equipment, and towers should be considered when selecting models. Manufacture, installation, operation and maintenance of equipment. The principle of distillation in a distillation column is to partially vaporize the liquid mixture, and use the characteristics of different volatility of each component to achieve separation. The column still is liquid, and the gas is distilled from the top of the column. The working principle of the distillation column is not limited to the purification of alcohol. The function of the distillation column is mainly to separate the mixed liquid, and use different liquids to separate liquids under different conditions, such as different temperatures and different volatility (boiling points), so as to achieve the purification effect. Distillation towers are mainly divided into plate towers and thin film towers. The plate column is more common, and its structure can be divided into three parts: plate, reboiler, and condenser.
Briefly introduce the application of distillation column in petrochemical industry
2022 / 04 / 16
Application in petrochemical industry process First, determine a plan. When determining the specific device process, it is necessary to pay attention to the three-stage vaporization method used in the whole process, so as to realize the rational setting of the initial distillation column, the atmospheric pressure column and the vacuum column. Second, determine the number of vaporization stages. Comprehensive reference to the corresponding characteristics of the crude oil of this enterprise, it is recommended to use the initial distillation column equipment, which is designed to better adapt to changes in various types of conditions. Among the crude oil materials, the high-boiling fraction with a temperature above 350 degrees Celsius can be regarded as the main raw material for catalytic cracking, distillate lubricating oil and hydrocracking and other corresponding equipment. After the analysis of the above reasons, it is necessary to implement the effective setting of the decompression tower equipment. Third, choose a heat exchange strategy. Combined with the actual refining situation and relevant experience of the enterprise, and various factors, the corresponding process content can be roughly obtained. Dehydration and desalination measures are taken for crude oil at 40 to 50 degrees Celsius, and then the heat exchange is completed in two ways; the gasoline components at the top of the tower are condensed and cooled, some of which will enter the top of the tower and play a good reflux role, and the other part It is output by the device after continuing to cool down. It should be noted here that whether the atmospheric distillation should use a two-stage vaporization process should comprehensively analyze the relevant factors according to the specific conditions. If the crude oil contains a lot of light fractions, the temperature of the crude oil will rise after a series of heat exchange The vaporization of the fraction will cause the pr
2022 / 04 / 15
The mold is a continuous steel casting equipment that accepts molten steel injected from the intermediate tank and solidifies it into a solid shell according to the specified cross-sectional shape. It is the most critical component of the continuous casting machine, and its structure, material and performance parameters play a decisive role in the quality of the slab and the production capacity of the casting machine. Introduce The crystallizer is a tank-shaped vessel with a jacket on the wall or a coiled tube in the vessel to heat or cool the solution in the tank. Crystallization tanks can be used as evaporative crystallizers or cooling crystallizers. In order to improve the strength of crystal production, a stirrer can be added in the tank. Crystallization tanks can be used for continuous operation or batch operation. The crystals obtained by intermittent operation are larger, but the crystals are easily connected into crystal clusters, and the mother liquor is entrained, which affects the purity of the product. The crystallizer has a simple structure and low production intensity, and is suitable for the production of small batches of products (such as chemical reagents and biochemical reagents, etc.). Classification There are two types of linear crystallizers on the inner wall of the section in the direction of billet drawing: arc and straight; according to their overall structure, whether arc or straight, there are two types of casing type and combined type. Casing The inner copper tube, the cooling water jacket composed of inner and outer water jackets and the foot roller are its main components. The outside of the straight or arc-shaped copper pipe is composed of a cooling water jacket, flanges and sealing elements to form a water supply and
The working Principle And Characteristics Of The Spiral Plate Heat Exchanger
2022 / 04 / 14
Characteristics It has the characteristics of compact structure, small footprint, high heat transfer efficiency, large operation flexibility, wide application range, small heat loss, and convenient installation and cleaning. The heat transfer channel is long, the distance between the channels is large, the heat resistance is high, and it is not easy to leak. Therefore, it has high heat exchange efficiency, and the temperature of the cold medium after heat exchange is easy to approach the temperature of the heat medium. It is suitable for heating or cooling treatment of viscous materials and granular materials, but it is not suitable for heat exchange of fibrous materials. Spiral plate heat exchanger is a kind of high-efficiency heat exchanger equipment, suitable for steam-steam, steam-liquid, liquid-liquid heat transfer, etc. Working principle For the two mediums for heat exchange, if they are both liquid, they should flow in a countercurrent manner in the flow channel of the spiral plate heat exchanger. The so-called countercurrent means that the two liquids in the two adjacent flow channels for heat exchange flow in the opposite directions of the spiral flow channels, so that a certain temperature difference can always be maintained between the two fluid media, so as to achieve a good heat transfer effect. For the two mediums for heat exchange, one is liquid and the other is gas, they should flow in a cross-flow manner in the spiral plate heat exchanger, that is, the liquid flows in the spiral direction in the heat exchanger, while the gas flows in the spiral direction. The axial direction of the heat exchanger passes directly, which is mainly due to the characteristics of the gas. The gas generally requires a large flow rate and a small resistance, or some are used for steam condensation, so the gas is generally not allowed to flow in the spiral direction.
Classification and role of storage tanks
2022 / 04 / 14
First, the use of storage tanks: steel storage tanks is the storage of various liquid (or gas) raw materials and finished products of special equipment, with dry storage of liquid or gas steel sealed Container, for many enterprises without storage tanks can not be normal production, especially the national strategic material reserves are inseparable from the various capacities and types of tanks. Second, the classification of storage tanks: by the different dry storage medium, the form of storage tanks are also varied. Classification by location: can be divided into above-ground storage tanks, underground storage tanks, semi-underground storage tanks, offshore storage tanks, submarine storage tanks, etc.. According to the classification of oil products: can be divided into crude oil storage tanks, fuel oil storage tanks, lubricating oil tanks, edible oil tanks, fire water tanks, etc. Classification by use: can be divided into production oil tanks, storage tanks, etc. China's oil storage facilities are mostly above-ground storage tanks, the purpose of the metal structure, so this site will focus on the use of domestic bragging vault storage tanks, internal floating roof storage tanks and horizontal storage tanks of some basic knowledge. According to the form of classification: can be divided into vertical tanks, horizontal tanks, etc. According to the classification of structure: can be divided into fixed-top tanks, floating-top tanks, spherical tanks, etc. (1) fixed-top storage tanks. Fixed-top tanks can be divided into cone-top tanks, arch-top tanks, self-supporting umbrella tanks. (2) momentless top storage tank (suspended chain momentless storage tank). Momentless top tank is based on the theory of suspension chain line, manufactured from thin steel plate. The longitudinal
Introduction to Cryogenic Concentration Technology
2022 / 04 / 13
Low temperature concentration technology is an innovative technology to separate salt water by simulating the natural evaporation and rainfall process; it is an important part of the sewage zero discharge project. Its working process is to use air or other gases to take out (humidify) the water molecules in the saline wastewater, and carry out wild knot (dehumidification) in another field, thus realizing the purpose of concentrating the saline wastewater. As we all know, concentration is a key step in the zero discharge of salty wastewater. Most of the traditional concentration devices use membrane concentration + evaporative concentration. The limit of membrane concentration is generally not more than 10%, and further concentration to saturation requires evaporative concentration. The energy consumption of the entire concentration process is huge, usually accounting for more than 80% of the total energy consumption, and more energy-efficient processes must be adopted to reduce operating costs. Traditional evaporation process Membrane concentration process: Calcium and magnesium ions must be removed in advance, and silicon ions can easily cause membrane blockage, which is difficult to remove. At the same time, it is necessary to ensure that the pH is weakly alkaline, otherwise it is easy to cause membrane poisoning and necrosis, and the pretreatment requirements are very high: even if the pretreatment reaches the standard , there are also work requirements for frequent cleaning and frequent replacement, and the labor intensity and maintenance costs are relatively high: due to the limitation of osmotic pressure, the membrane concentration can only be concentrated to about 10% at most, and the zero-emission scheme still needs to continue to be concentrated in the future. Evaporation and concentration process: high temperature operation, the stronger the corrosiveness of chloride ions, the higher the requirements for equipm
Introduction of Methanol Alcohol Recovery Tower
2022 / 04 / 12
Suitable for pharmaceutical, food, light industry, chemical and other industries of the Greek alcohol recovery. The corresponding adjustment of the equipment can also be distilled and recovered for other solvents such as toluene and methanol. Such as the distillation of about 30 ℃ Xi alcohol to 90 ℃ ~ 95 ℃ alcohol, the finished alcohol precision requirements and then high, you can increase the reflux ratio, but the output will be reduced accordingly. Our factory adopts high-efficiency metal stainless steel packing, and distillation tower is also generally made of stainless steel, thus preventing the phenomenon of iron chips blocking tower packing and extending the service life of the device. At the same time, all equipment in contact with the solvents, such as condensers, pressure stabilization tanks, cooling snake tubes, etc. are made of stainless steel to ensure that the finished solvents are not contaminated. The selection of equipment material can also be determined according to the material situation. The distillation kettle adopts the detachable U-shaped tube, which can be pulled out of the kettle during maintenance, so that the outer wall of the heating tube and the wall of the distillation kettle can be cleaned. This device can be produced intermittently or semi-continuously or continuously.
Under what circumstances does the stainless steel reactor need to be repaired
2022 / 04 / 12
Stainless steel reaction kettle is an indispensable anti-corrosion equipment in chemical manufacturing industry. In individual cases, the damage needs to be repaired. What specific stainless steel reaction kettle needs to be repaired? If the application of mechanical shock, temperature change and other factors often causes de-ceramic, cracks, bubbles, pores and other damage to the surface glaze, such defects are never allowed in the stainless steel reactor kettle. Once When this happens, it must be fixed. The repair of stainless steel reactor requires the selection of on-site repair glue of polymer composite material, which is a two-component composite material composed of polymer, carbon steel powder or industrial ceramic powder as the base material and epoxy curing agent. Compared with general epoxy resin repair adhesives, polymer composite materials rely on their own finer and more polymer structure, so that they have strong bonding force and excellent corrosion resistance, corrosion resistance indicators, polymer materials, and even Penetrates into the metal, making the protective layer of polymer composites tighter. Repair process: surface cleaning, anti-rust treatment, anhydrous ethanol cleaning, coating primer, coating surface repair glue, dry solidification, application. The maintenance of the stainless steel reactor should always pay attention to the performance of the entire equipment and the reducer. The reducer lubricating oil should be added enough. The electric heating medium oil should be replaced for half a year. Electric heating rods and electric instrument panels should be maintained regularly. If there is any problem, they should be replaced or repaired in time. When the equipment is not in use, it must be cleaned with warm water on the inner an
Introduction of fixed tube and plate heat exchanger
2022 / 04 / 11
Fixed tube plate heat exchanger is the tube bundle at both ends of the tube plate using welding methods and shell fixed connection of shell and tube heat exchanger. Tube plate and shell welding can also be used as a flange, and the flange of the tube box with bolted connections. Advantages are simple structure, in order to ensure equal heat transfer surface conditions required for the minimum shell inside diameter. The disadvantage is that the shell and tube process between the medium temperature difference will produce a large thermal stress, resulting in the combination of the tube and tube plate pull off the rupture and leakage or tube instability, etc., while maintenance, shell cleaning is not convenient, widely used in general applications, but also by the temperature limit. Heat exchangers can be divided into: fixed tube and plate heat exchanger, floating head heat exchanger; U-shaped tube heat exchanger; stuffing box heat exchanger according to the structure form. Fixed tube and plate heat exchanger is composed of tube plate and shell at both ends. Because of its simple structure, it is more widely used. Fixed tube and plate heat exchanger is an energy-saving equipment to realize heat transfer between materials, which is a process equipment commonly used in petroleum, chemical, petrochemical, metallurgy, electric power, light industry, food and other industries. In the refinery, chemical device heat exchanger accounts for about 40% of the total number of equipment, accounting for 30%-45% of the total investment. With the development of energy-saving technology, the application field is expanding, the use of heat exchangers for high and low temperature heat recovery has brought significant economic benefits.
A brief introduction to the types and advantages and disadvantages of tubular heat exchangers
2022 / 04 / 09
Type 1 Fixed tube plate type Tube heat exchanger structure is relatively simple, compact, inexpensive, but outside the tube can not be mechanically cleaned. This type of heat exchanger tube bundle connected to the tube plate, the tube plate were welded to the ends of the shell, and connected to its top cover, the top cover and shell with fluid import and export receiver. Usually outside the tube device a series of baffles perpendicular to the tube bundle. At the same time both the tube and the tube plate are connected to the shell rigidly, while inside and outside the tube are two different temperatures of the fluid. Therefore, when the tube wall and shell wall temperature difference is large, due to the difference in thermal expansion between the two, resulting in a large temperature difference stress, so that the tube twist and bend or make the tube loose from the tube plate, or even destroy the heat exchanger. In order to overcome the temperature difference stress must have temperature compensation device, generally in the tube wall and shell wall temperature difference of more than 50 ℃, for safety reasons, the heat exchanger should be temperature compensation device. But the compensation device (expansion joint) can only be used in the shell wall and tube wall temperature difference of less than 60 ~ 70 ℃ and the shell process fluid pressure is not high. General shell pressure of more than 0.6Mpa due to the compensation ring is too thick, difficult to expand, lose the role of temperature compensation, should consider other structures. 2 floating head type Heat exchanger of a tube plate with a flange connected to the shell, another tube plate is not connected to the shell, in order to make the tube heat or cooling can be freely expanded, but in this tube plate connected to a top cover, called the "floating head", so this heat exchanger called floating head heat exchanger. Its advantages are: the tube bundle can be pull
Introduction of high temperature and high pressure reactor
2022 / 04 / 08
High-temperature autoclave is suitable for chemical and chemical reactions, which require simultaneous determination of temperature, addition of inert gas, pressure, PH value, conductivity, redox potential for precise chemical synthesis reactions. The material of high temperature and high pressure reaction kettle is mainly made of SS316L stainless steel, and titanium (TA2), nickel (Ni6) and composite steel plates can be made according to the requirements of different media. The structure of kettle body includes flat cover, convex cover and closed reaction kettle body with manhole. The heating methods are jacketed steam, jacketed thermal oil electric heating, etc. for customers to choose when ordering. For the inner surface of the kettle with polishing requirements, it can reach the above mirror polishing level, and for high viscosity materials, it is processed into conical bottom, which is easy to discharge and clean.
Classification and precautions of chemical storage tanks
2022 / 04 / 08
There are many varieties of storage tanks. Chemical storage tanks are very common and commonly used, and they are mainly used in the chemical industry, so they are called chemical storage tanks. So what are the classifications of chemical storage tanks, and what are the precautions? 1. Classification of chemical storage tanks Chemical storage tanks can be divided into three types: metal, non-metal and metal-non-metal composite. Among them, metals include stainless steel and aluminum, and non-metals include ceramics and glass fiber reinforced plastics. As for the third type, its typical representative is the raw material for steel lining. 2. Precautions for chemical storage tanks (1) If the chemical storage tank stores flammable, explosive or corrosive media, it should be operated in strict accordance with the relevant regulations. (2) If the chemical storage tank is to be overhauled and other operations, the power supply of the electrical equipment related to it should be cut off before proceeding. If necessary, the accounting procedures for the equipment should also be handled. (3) For in-tank operations in chemical storage tanks, corresponding operation permits shall be held. If there is a longer interruption, it must be processed from the beginning. (4) In the process of operation, if it is necessary to build scaffolding or lifting equipment, etc., make sure that it is firm and reliable, and then ensure that it can be operated safely. (5) When working in the tank, someone outside the tank must be supervised, and a reliable contact method should be selected, so that the personnel outside the tank can know the operation status in time. In t
2022 / 04 / 08
The reaction kettle is usually used for material reaction, stirring, rectification, cooling, mixing, alkylation, sulfurization, nitration, polymerization, condensation and other functions. The reaction kettle is divided into normal pressure and pressure during use, so it is necessary to understand its performance when using it, and operate it according to the regulations: 1. Before the reactor works, the pipelines and valves related to the reaction should be checked first, and the materials can be fed only when the conditions for receiving materials are ensured. 2. Before starting the stirring part of the reactor, check whether the stirring motor, reducer, mechanical seal, etc. are normal, whether the oil level of the reducer is appropriate, and whether the cooling water supply of the mechanical seal is normal. In the case of ensuring no doubt, start the stirring and put in the material according to the specified amount. The reaction kettle or the reaction kettle stirring the bottom bearing is strictly prohibited from idling, and the stirring can be started only when the bottom bearing is immersed under the leaf surface. Strictly implement the process operation rules, pay close attention to the temperature and pressure in the reactor and the pressure of the jacket of the reactor, and strictly prohibit over-temperature and over-pressure. 3. During the reaction process, the reaction kettle should be inspected, and problems should be dealt with in time. 4. If the over temperature phenomenon occurs in the reaction kettle, immediately cool down with water, and the temperature after cooling should meet the technological requirements. 5. If overpressure occurs in the reactor, immediately open the emptying valve and release the pressure urgently. 6. If
Briefly describe the operation and shutdown steps of the distillation column
2022 / 04 / 07
The rectification tower is a tower type gas-liquid contact device for rectification. Taking advantage of the fact that each component in the mixture has different volatility, that is, the vapor pressure of each component is different at the same temperature, the light components (low boilers) in the liquid phase are transferred to the gas phase, while the vapor pressures in the gas phase are different. The heavy components (high boilers) are transferred to the liquid phase for separation purposes. Open tower operation: Heat the rectifying tower to make it close to the operating temperature; pressurize the tower to meet the normal operating pressure; add raw materials to the tower; open the heat source of the reboiler and each heater, open the top condenser and each cooling power to the device; make incremental adjustments to the operating conditions and parameters of the device. Tower Parking Gradually reduce the feeding; the steam will not be reduced in a short period of time; correspondingly reduce the amount of heating agent and coolant until it is completely stopped; discharge the liquid stored in the tower; implement the depressurization and cooling of the tower; clean the distillation tower with water.
2022 / 03 / 22
Introduction to the process of low temperature concentration + evaporation and crystallisation of centrifuged salt: The previous section describes how the brine is concentrated by low temperature evaporation to near saturation concentration (25-29%) and discharged to the next process. This article continues with the subsequent treatment process of the crystallised effluent salt. The highly concentrated brine enters a forced circulation evaporator after heat exchange and is heated with raw steam for evaporation, with the resulting secondary steam used as the heat source for low temperature evaporation. As evaporation proceeds, the concentration of salt in the waste water becomes higher and higher, and when it exceeds saturation, the salt precipitates out continuously, and after treatment, the solid sodium chloride is packaged and sold. In the salt crystallisation plant, our team uses a number of innovative technologies, such as the use of self-cleaning devices to effectively remove scaling and the adhesion of organic matter and salt to the inner walls of the plant, the installation of a rotating foam trap in the upper part of the evaporation chamber to reduce the phenomenon of salt carried by droplets, and the installation of a deflector plate in the salt sludge tank to promote the growth of crystal salt and improve product quality, which has resulted in improved product quality and continuous operation of the plant These innovations have improved the quality of the product and the continuous operation of the plant, reduced the labour intensity of the workers and lowered the overall operating costs. The low temperature concentration + evaporation and crystallisation process is very suitable for plants without low grade heat source, firstly, the low concentration salt-containing wastewater is concentrated to a higher concentration, then it enters the evaporation and crystallisation system to evaporate and crystallise, using the seconda
Introduction to low temperature concentration-evaporative crystallisation technology
2022 / 03 / 21
The advantages of the low temperature evaporation (LTE) concentration process, which allows the concentration of saline wastewater to be concentrated to 25% in one go, are enormous: 1. Low pre-treatment requirements for waste water 2. Lower labour intensity of personnel, can be unattended 3. The waste heat and latent heat of the plant can be fully utilized 4. Lower material requirements for equipment due to lower temperature 5. Online cleaning is possible 6. TDS in fresh water can be controlled within 200ppm The great advantages of this low temperature concentration + evaporation crystallisation plant are: 1. Reduced pre-treatment requirements for waste water 2. The unit can be started/stopped at the touch of a button, without intervention, greatly reducing the labour intensity of workers 3. Continuous operation of the plant, no need to stop for cleaning, greatly improving operating efficiency 4. Making full use of the waste heat and latent heat of the plant, reducing operating costs 5. Stable product quality and reliable TDS index in recovered fresh water 6. Low operating cost of the plant, equivalent to the energy consumption of evaporation of more than 10 effects
Introduction to low temperature concentration-evaporative crystallisation technology
2022 / 03 / 19
Introduction to low temperature concentration-evaporative crystallisation technology: In response to a series of problems with existing evaporation units, the engineering team has worked out the low temperature concentration technology through extensive experiments. Steam (which can be secondary steam from crystallisation or waste or latent heat from the plant) heats the low salt wastewater and enters the humidification tower, where heat and mass transfer exchange takes place. The water vapour nearing saturation enters the bottom of the dehumidification tower, while fresh air is drummed into the bottom of the humidification tower, and when the concentrated water is close to saturation, it is discharged to the next process. In the dehumidification tower, the cold water sprayed from the top prompts the water vapour to cool down and condense to produce fresh water, and the fresh water at the bottom of the tower is discharged to the standard.
Introduction to cryogenic concentration technology
2022 / 03 / 18
Introduction to cryogenic concentration technology: Cryogenic concentration is an innovative operation for separating brine by simulating the natural process of evaporation and rainfall and is an important part of the Zero Waste Water Disposal project. It works by using air or other gases to bring out the water molecules in the saline wastewater (humidification) and condense them at another place (de-humidification), thus achieving the purpose of concentrating the saline wastewater. It is well known that concentration is a key step in the reduction of saline wastewater discharge. Most of the traditional concentration devices choose membrane concentration + evaporation concentration, the limit of the concentration membrane generally does not exceed 10%, and then further concentration to saturation requires evaporation concentration, the energy consumption of the whole concentration process is huge, usually accounting for more than 80% of all energy consumption, and more energy-efficient processes must be used to reduce operating costs. In the traditional evaporation process: 1. membrane concentration process: calcium and magnesium ions must be removed in advance, silica ions are easy to cause membrane blockage, removal is difficult, while the PH needs to be ensured into a weak alkaline, otherwise it is easy to cause membrane poisoning and necrosis, the pre-treatment requirements are very high; even if the pre-treatment is up to standard, there are also the work requirements of diligent cleaning and replacement, personnel labor intensity and maintenance costs are high; limited by the osmotic pressure, membrane concentration can be concentrated to about 10% at most The zero discharge solution requires further concentration. 2. Evaporation and concentration process: high temperature operation, the stronger the chloride ion corrosiveness, higher requirements for equipment materials; the higher the concentration of brin
Introduction to the 3-in-1 filter washing machine
2022 / 03 / 17
Introduction to the 3-in-1 filter washing machine: The equipment consists of vertical container, stirring device, lifting mechanism, transmission mechanism, filtering device, washing device and other components, it is a multifunctional solid-liquid separation equipment integrating stirring, mixing, beating, filtering and washing in one. It is widely used in chemical, food, printing and dyeing, pharmaceutical and other industries. Its characteristics: 1. Completely sealed and filtered, no leakage, in accordance with GMP norms. 2. Operates under pressure or vacuum to achieve solid-liquid separation, with even distribution of the filter cake and good solid-liquid separation. 3. The spraying device measured inside the container enables the cleaning liquid to be evenly distributed to the container, which can achieve the cleaning of the inner wall of the container and the material. 4. By lifting and lowering the stirring paddle to fully mix the filter cake with the cleaning liquid, so that the slurry suspension filter cake is fully washed. 5. Solid materials are automatically discharged by reversing the stirring paddle.
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Ms. Lucy Liu
Tel:86--18556139427
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Mobile Phone:+8617558783303
Email:sunjiawei@yzcheequipt.com
Address:No. 9 Yangtes south Road (No. 1 Bonded Zone), Yangzhou, Jiangsu
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