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Method and system for anti-scaling and descaling of membrane evaporator

A film evaporator and anti-scaling technology, which is applied in the direction of cleaning heat transfer devices, flushing, lighting and heating equipment, etc., can solve the problems of slow material flow, scaling, and affecting production efficiency, so as to slow down the speed of scaling , Strengthen heat transfer efficiency, improve the effect of descaling efficiency

Active Publication Date: 2018-12-18
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The horizontal tube falling film evaporator has high heat exchange efficiency, but the material flows slowly on the surface of the heat exchange tube, which is easy to scale on the surface of the heat exchanger. Frequent shutdowns are required to clean the scale to ensure heat exchange efficiency and affect production efficiency.

Method used

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  • Method and system for anti-scaling and descaling of membrane evaporator
  • Method and system for anti-scaling and descaling of membrane evaporator
  • Method and system for anti-scaling and descaling of membrane evaporator

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Embodiment

[0037] refer to figure 1 , the present invention adopts two kinds of flow rate fluids to pass through the heat exchange surface. One is the main fluid pumped by the second circulation pump 2, which is the same as the existing film evaporator, with large flow rate and low flow rate; the other is the secondary fluid pumped by the first circulation pump 3, with small flow rate and low flow rate. The flow rate is high, and the high-speed fluid sprays the surface of the heat exchange tube to wash away the scale that has just formed on the heat exchange surface. The auxiliary fluid is sprayed out after being pressurized by the first circulation pump 3. The power consumption per unit mass of the fluid is higher than that of the main fluid, but the flow of the auxiliary fluid is less, generally only accounting for 2-4% of the main fluid, so the overall energy consumption increases little.

[0038] The auxiliary fluid is pressurized by the first circulation pump 3 and enters the injec...

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Abstract

The invention discloses a method and a system for the scale prevention and descaling of a film type evaporator. Two fluids sequentially pass a heat exchange surface at different flow rates, one is a main fluid with a relatively larger flow but a low flow rate, and the other is an auxiliary fluid with a relatively smaller flow but a high flow rate. First, the main fluid is sprayed on the heat exchange surface. Then, the auxiliary fluid is jet on the heat exchange surface at the high flow rate so as to scour off scale formed on the heat exchange surface. The method and the system have the beneficial effects that scaling speed is reduced, and descaling efficiency is increased; and under the condition of normal evaporation, the whole heat exchange surface is strongly interfered by the fluid which is jet at the high rate, and at a result of strong interference, the heat exchange efficiency of the main fluid is enhanced.

Description

technical field [0001] The invention relates to the technical field of anti-scaling and descaling of heat exchangers, in particular to a method and system for anti-scaling and descaling of a membrane evaporator. Background technique [0002] Evaporation and concentration system is to evaporate the solvent and leave the solution by heating, and the non-volatile solute is still dissolved in the remaining liquid solvent to realize the separation of solvent and solute; generally such evaporation and concentration process is completed in the evaporator. The heat exchanger is usually a partitioned wall heat exchanger, that is, one side is the heat source, and the other side is the evaporated and concentrated solution that needs to be processed. Since the solution contains solutes, such as salt, calcium ions, magnesium ions, organic matter, etc., as the solution evaporates and becomes thicker, solutes may precipitate on the surface of the heat exchanger and adhere to the surface of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28G9/00
Inventor 黄冲何世辉杨承志宋文吉冯自平
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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