Sewage source self-cleaning dry type evaporator and control method

Abstract

The invention relates to a sewage source self-cleaning dry type evaporator which comprises a shell body and a pipe body. The pipe body penetrates in the shell body in a connected mode to form a pipe pass. A shell pass is formed between the inner wall of the shell body and the pipe body. The two ends of the pipe body are provided with an inlet and an outlet of the pipe pass. The two ends of the shell body are provided with an inlet and an outlet which communicate with the shell pass correspondingly. The inlet and the outlet of the shell pass are provided with electromagnetic valves correspondingly. The inlet of the shell pass is connected with a chilled water pump. Flow splitting plates are installed in the shell body in the length direction of the pipe body and divide the shell pass into a broken line channel. The top of the shell body is provided with at least one row of water supply valve connection bases arranged at intervals in the length direction of the shell body. The water supply valve connection bases are provided with water supply electromagnetic valves correspondingly. The input ends of the water supply electromagnetic valves are connected with water supply pipes. A row of sewage drainage valve connection bases are correspondingly arranged at the bottom of the shell body and provided with sewage drainage electromagnetic valves. The output ends of the sewage drainage electromagnetic valves are connected with sewage drainage pipes.

Description

technical field [0001] The invention relates to the field of air-conditioning evaporators, in particular to a clean dry evaporator from which sewage comes and a control method. Background technique [0002] In recent years, due to the vigorous implementation of the coal-to-electricity policy, in the Yangtze River Basin, especially the Huaihe River Basin and the Yellow River Basin, household and commercial winter heating equipment has been changed from coal-fired, oil-fired, and gas-fired boilers to air-source and water-source heat pump air-conditioning units. Boiler heating system has remarkable environmental benefits, high efficiency and energy saving, stable and reliable operation, one machine with multiple functions can be used in a wide range of applications (heating and heating in winter, heat exhaust and cooling in summer, heating and supplying domestic hot water throughout the year), and low investment and operation costs. Since a considerable part of it uses urban se...

AI Technical Summary

Problems solved by technology

Sewage source dry evaporators are prone to fouling on the surface of heat exchange tubes due to the foul characteristics of the shell-side medium, which will affect the normal use of equipment, including failure of refrigeration and air conditioning equipment, decline in refrigeration (heat) efficiency, and increase in energy consumption. In severe cases, it will cause the device to alarm and shut down, or even cause serious accidents, so it is necessary to clean the shell-side medium flow channel frequently

[0005] For the straight heat exchange tube dry evaporator, since the tube sheet and the cylinder are permanently connected by welding, physical or mechanical cleaning tools cannot enter the shell-side medium flow channel for cleaning, and generally only chemical cleaning agents can be used, but The use of chemical cleaning agents will cause secondary pollution to the shell-side medium (most of the chemical cleaning agents are toxic and harmful, they are either alkaline or acidic, or contain carcinogens, fluorides, or cause COD ( increase in chemical oxygen demand)

[0006] For the U-shaped heat exchange tube dry evaporator, since the tube sheet and the cylinder are non-permanently connected by fasteners, the core can be pulled out from the shell, and the core can be removed from the shell by using physical or mechanical cleaning tools to enter the shell-side medium flow channel for cleaning. Cleaning, but the main body of the evaporator needs to be disassembled, and the refrigerant inlet and outlet of the evaporator tube side and the liquid supply port and air return port of the refrigeration and air-conditioning unit need to be separated, which leads to the discharge of Freon refrigerant in the refrigeration and air-conditioning equipment, causing secondary pollution (Freon refrigerants will cause damage to the atmospheric ozone layer and aggravate the greenhouse effect)

[0007] Therefore, the conventional dry evaporator cannot clean the shell-side medium channel without causing secondary pollution

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