Defrosting group control method for direct-cooling type deep-enthalpy heat removal air return heat pump system

Abstract

The invention discloses a defrosting group control method for a direct-cooling type deep-enthalpy heat removal air return heat pump system. The defrosting group control method comprises the followingsteps that a heat removal valve F<heat removal> on a heat removal heat exchanger is closed, and heat removal is stopped; a defrosting valve F<defrosting> on a defrosting heating pipe is opened, aftera period of set time defrosting is conducted, the defrosting valve F<defrosting> is closed, and defrosting is stopped; the air return pressure difference value between an air inlet end and an air outlet end of an air return heat removal box is measured and calculated; and when the air return pressure difference value is greater than a set value, a spraying valve F<spraying> is opened, the outer surface of the heat removal heat exchanger is cleaned, otherwise, the heat removal valve F<heat removal> is opened for heat removal. The defrosting group control method for the direct-cooling type deep-enthalpy heat removal air return heat pump system can smoothly remove frost on the surface of the air return heat removal box.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for recovering waste heat system of coal mine exhaust air (return air). Background technique [0002] The direct-cooling deep enthalpy exhaust air heat pump system includes a exhaust air heat extraction box, through which the heat in the exhaust air is extracted. Since the temperature of the exhaust air is extremely low after heat extraction, it usually reaches -10°C or even lower. And because the exhaust air contains water vapor, the water vapor will frost on the surface of the exhaust air heating box. If the frost is not removed in time, it will affect the heat extraction process. threaten. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a defrosting group control method for a direct-cooling deep enthalpy heat extraction exhaust air heat pump system that can smoothly remove the frost on the surface of the exhaus...

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Problems solved by technology

[0002] The direct-cooling deep enthalpy exhaust air heat pump system includes a exhaust air heat extraction box, which extracts heat from the exhaust air through the exhaust air heat extraction box. Since the temperature of the exhaust air is extremely low after heat extraction, it usually reaches -10°C or even lower. And because the exhaust air contains water vapor, the water vapor will frost on the surface of the exhaust air heating box. If the frost is not removed in time, the heat extraction process will be affected, and at the same time, the wind resistance of the exhaust air heating box will be increased, which will affect the safety of coal mine ventilation. threaten

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