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• External circulation evaporator structure and working principle

  2024 / 03 / 15

  External circulation evaporator is also called external heat evaporator, its heater is directly placed on the outside of the evaporator, and the long diameter of the heating tube is relatively large, so the material liquid circulation flow rate is high. The external circulation evaporator is mainly applicable to the evaporation of the material liquid with large concentration, large viscosity and easy to be scaled and coked. This kind of evaporator in chemical industry, medicine, food and other industries have application. Due to the material liquid in the tube liquid column is higher, improve the lower part of the liquid The boiling point of the body, so the heating error is required to be larger, limiting the use of multi-effect. This evaporator raw steam (primary steam) heating temperature are higher. 1, feed: the liquid to be treated feed into the evaporator. 2, evaporation: in the external circulation evaporator, to be treated liquid from the feed pipe into a heater, and then be heated, so that part of it into a vapor state. 3.Condensation: The vapor passes through the condenser inside the evaporator, which is usually a tube bundle or heat exchanger, in which the cooling medium is transferred to condense the vapor into liquid. 4.Separation: Inside the evaporator, liquid and vapor are separated by a separation device. Commonly used separation devices include gravity separators, centrifuges and cartridges. 5.Recirculation: The separated liquid is recirculated inside the evaporator. Usually, part of the liquid will flow back to the bottom of the evaporator through a return tube to maintain the stable work of the evaporator. 6.Vapor discharge: The vapor that is not condensed is discharged from the evaporator through an exhaust port to enter the subsequent treatment or recycling. Throughout the process, the external circulation ev

• Reflux methods and applications in distillation operations

  2024 / 02 / 24

  We know that a distillation tower generally consists of a tower kettle, tower section, condenser, discharge pipeline, output pipeline, reflux pipeline, etc. Why do we need a return line? Let's first talk about the main role of reflux in distillation towers: Firstly, provide cold reflux on the tray to remove excess heat inside the tower and maintain heat balance inside the tower; Secondly, provide a cold fluid on the tray, where the gas-liquid phases come into reverse contact. The heavy components in the upward gas condense, while the light components in the downward liquid absorb heat and vaporize. This repeated condensation and vaporization process fills the entire tower section with light components The components, the lower part is the recombinant component, further improving the separation purity of the product. Therefore, reflux liquid is a necessary condition for distillation purification. 1. Common reflux methods in distillation operations Firstly, according to the different reflux methods, it can be divided into "natural reflux" and "forced reflux". Natural reflux refers to the condenser of the tower located above the distillation tower section, with a certain height. The liquid storage outlet of the condenser is higher than the reflux outlet of the tower section and has a certain distance. The reflux liquid flows back into the tower under the action of gravity. Natural reflux operation is simple and does not require a reflux pump, saving power consumption. However, the reflux rate varies with the pressure inside the tower, and the reflux ratio is not strict. When production is abnormal, the adjustment is relatively slow. Natural reflux is widely used in small distillation units, requiring sufficient height and space. Forced reflux is the installation of a pump on the reflux pipeline, and the reflux liquid is pumped into the tower for reflux. The reflux flow rate of forced reflux is stable and easy to adjust. When p

• Steps, Applications, and Efficiency Improvement Measures for Thin Film Evaporators

  2024 / 01 / 24

  Thin film evaporator is a type of evaporator, characterized by material flowing in a film like manner along the heating tube wall for heat transfer and evaporation. It has high heat transfer efficiency, fast evaporation speed, and short material residence time, making it suitable for the evaporation of heat sensitive substances. According to the reasons for film formation and flow direction, it can be divided into three types: rising film evaporator, falling film evaporator, and scraping film evaporator. Below are the steps, applications, and efficiency improvement measures for using thin film evaporators. Steps for using a thin film evaporator 1. Preparation before driving (1) General products have undergone water pressure testing and trial operation before leaving the factory, and the indicators meet the requirements. (2) Start the motor and observe if the direction of operation is correct. It should rotate clockwise and not reverse. (3) Measure whether the radial swing and axial string momentum of the shaft meet the requirements, and check whether the sealing is tightly sealed. (4) Whether the oil level of the gearbox is in a normal state and whether the cooling water of the mechanical seal is kept unobstructed. 2. Normal driving (1) Turn on the circulating cooling water pump and put the condenser in operation. Then open the concentrated solution container and vacuum the valve. (2) Open the feed valve and pump in the feed liquid. Connect the power, start the motor, and observe if the direction of rotation of the motor is correct. (3) Slowly open the steam valve and connect the steam trap, so that the steam pressure is around 0.15MPa. (4) Observe the discharge of the evaporator and wait for the equipment to run stably for 5 minutes before sampling and analyzing the concentration of the concentrated solution. If the concentration does not meet the standard, make adjustments. When t