Composite dehumidifying method based on film and its apparatus and application

Abstract

The composite dehumidifying process based on membrane includes the following steps: the heat and humidity exchange between fresh air and indoor exhaust via membrane and the deeply dehumidifying in the second stage dehumidifier. The apparatus for said process consists of membrane exchanger and second stage dehumidifier connected together, and the second stage dehumidifier is turning wheel dehumidifier, compression dehumidifier or liquid absorbing dehumidifier. The present invention can recover afterheat and surplus humidity and moves the second stage dehumidifier to low temperature and low humidity area to lower the dew point of exhausted air, and can save power and realize high efficiency and low dew point dehumidifying. The present invention may be used widely.

Description

technical field [0001] The invention relates to composite dehumidification technology, in particular to a membrane-based composite dehumidification method and its equipment and application. Background technique [0002] In recent years, with the development of my country's society and economy, people's living standards have been continuously improved, and higher requirements have been put forward for the comfort of the living environment, among which the demand for dehumidification has become stronger and stronger; in some special departments, such as archives, Tobacco, military industry, medicine, etc., as well as underground or semi-underground buildings, etc., also have higher dehumidification requirements according to different uses. Air conditioning includes the adjustment of temperature and humidity, among which dehumidification is a high energy consumption work, the water vapor content in the air is very small, only a few tens of grams of water ...

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Problems solved by technology

[0003] The current dehumidification methods include compressor refrigeration method, liquid absorption method and rotor adsorption method. These methods consume relatively high energy consumption and cannot recover the waste heat and humidity in the exhaust air.

The Chinese Utility Model Patent No. 00227043.9 discloses a wheel dehumidification technology. The fresh air is directly dehumidified through the dehumidification wheel, and the regeneration fan is connected to the outlet of the regeneration air through the regeneration air duct and the 1 / 4 area of ​​the dehumidification wheel. The regenerative heating The device is connected to the regeneration area of ​​the dehumidification wheel assembly through the regeneration air channel. In this technology, the waste heat and humidity of the exhaust air cannot be utilized, resulting in waste of energy.

The Chinese utility model patent No. 97214969.4 discloses a household circulating liquid hygroscopic agent air dehumidifier, which is mainly provided with a moisture absorption grid vertically arranged by several pieces of superabsorbent fabrics in the moisture absorption chamber, and its lower and upper parts are respectively storage The liquid tank and the moisture absorption spray head are provided with several electric heating elements in the concentration chamber, and the concentration tank and the concentration spray head are respectively arranged on the lower part and the upper part, and the concentration tank and the liquid storage tank are connected by a return pipe. The residual heat and humidity in the indoor exhaust air are not utilized, and the energy consumption of these dehumidification technologies is relatively high

The Chinese utility model patent CN2593094Y announced on December 17, 2003, "air dehumidification and cooling device with heat recovery" can realize the continuous recovery of heat and humidity from exhaust air, but it adopts the method of continuous circulation of hygroscopic solution. Although the system is complicated, But it can't achieve deep dehumidification, the dehumidification capacity is limited, and it can't achieve low dew point dehumidification

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