Improved type four-effect rising film evaporator and concentration method

Abstract

The invention relates to an improved type four-effect rising film evaporator and a concentration method, the evaporator comprises a four-effect heater and a separator, the material outlets in a three-effect heater and a three-effect separator are merged and connected to the four-effect separator through a three-effect charging pump, the material outlet of the four-effect separator is connected to the material outlet at the bottom of the four-effect heater through a pressure pump, and the material outlet at the top of the four-effect heater is connected to the four-effect separator through a pipeline. The material is orderly passed through the heater and the separator and then is directly sent to the four-effect separator, then the material in the four-effect separator is sent to a cavity at the bottom of the four-effect heater by the pressure pump from the bottom of the four-effect heater, so that the material flows from top to down by pressurizing, and flows back to the four-effect separator from the cavity at the top of the four-effect heater to form a complete cycle. According to the improved type four-effect rising film evaporator, through multitime cycle, the concentration of concentration limit can increase to 35-37%, heat energy utilization rate is increased, steam can be saved by 30%, and the consumption time is not changed.

Description

technical field [0001] The program relates to the technical field of four-effect falling film evaporators used in the pharmaceutical industry. Specifically, it is an improved four-effect falling film evaporator and its use method. Background technique [0002] The basic unit of the falling film evaporator generally includes a heater and a separator, and is used in conjunction with a subsequent condenser. The raw material liquid enters from the top of the evaporator and flows down along the tube wall with gravity. [0003] Its working principle is that the falling film evaporation is to add the feed liquid from the upper tube box of the heating chamber of the falling film evaporator, and distribute it evenly into each heat exchange tube through the liquid distribution and film forming device, and form a uniform film along the inner wall of the heat exchange tube. shed. In the process of flowing down, it is heated and vaporized by the shell-side heating medium, and the gener...

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Problems solved by technology

[0005] The falling film evaporator can be used to evaporate solutions with high viscosity (0.05-0.45Pa s) and high concentration, but it is not suitable for solutions that are easy to crystallize and scale easily, because this kind of solution is formed in the distributor. Uniform liquid film is difficult, and the heat transfer coefficient is not high

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