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Features of adsorption dehumidification method

source:Plastic pellet dryer
Author:plastic dryer
time:2020年10月12日 10:34:59

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The characteristics of the adsorption dehumidification method:     
Dehumidification using the characteristics of low vapor partial pressure of the moisture absorbent, not easy to crystallize, stable performance after heating, and low viscosity. Hygroscopic agents generally use solutions such as lithium oxide, triethylene glycol, lithium chloride, and calcium chloride. The characteristic of this method is that by adjusting the concentration of the dehumidifier, the relative humidity of the treated air can be accurately controlled; it can continuously dehumidify and achieve good dehumidification effects even at low temperatures;

The dehumidifier has a sterilization effect and is generally suitable for systems with a large amount of dehumidification. The biggest disadvantage of liquid hygroscopic agent is that it is corrosive and the absorbing liquid is easily carried away by air. In order to overcome these shortcomings, a lithium chloride rotary wheel dehumidifier is derived, which is a special asbestos paper rolled into a honeycomb cylindrical paper core As a carrier, it is a dry dehumidification equipment that impregnates lithium chloride and a protective strengthening agent on a special asbestos paper carrier. The protective strengthening agent (refined polyaluminum) not only protects the moisture absorbent from being carried away by the air, but also improves the strength of the absorbent paper. The lithium chloride runner has a large moisture absorption area per unit volume and strong dehumidification ability. It can also obtain a better dehumidification effect at low temperatures. This is because the lower the temperature, the more crystal water contained in lithium chloride. At the same time, when the temperature is low At 0°C, the absorbent paper will not freeze and can still exchange with the surrounding air better, so it is easy to obtain dry air with low dew point. At room temperature, the partial pressure of water vapor of the moisture absorbent is lower than that of air, so it can absorb moisture in the air. The water vapor is absorbed and releases the latent heat of vaporization, so it passes through the runner
The air of an industrial dehumidifier becomes air whose temperature increases and humidity decreases. In order to prevent the moisture absorption capacity from decreasing as the moisture of the hygroscopic agent increases, the lithium chloride runner is divided into a moisture absorption zone and a regeneration zone through a separator. The air used for regeneration is filtered and heated to 120°C by a heater to enter the box regeneration zone. As the temperature of the moisture-absorbing paper core in the regeneration zone rises, the moisture contained in it vaporizes and is taken away by hot air and discharged outside. Moisture absorption and regeneration can be carried out at the same time, so continuous and stable dry air can be guaranteed. Lithium chloride rotary dehumidifier has a wide range of applications. It can be used in situations where the relative humidity is 10%-30%. It can be used in combination with freezing dehumidification to obtain a 40%. Dry air with C dew point temperature can be used in special occasions with low humidity requirements.
The use of dehumidification dryers can be divided into stand-alone type and centralized type. Stand-alone dehumidification dryers usually include a dryer host, a drying barrel, and a suction machine. The use of a single machine is suitable for a small amount of various drying, and its advantages are good drying efficiency and convenient and fast material change.   The centralized dryer includes a dryer host and several drying barrels. Each drying barrel has an independent heating controller, which can dry several different raw materials at the same time, and cooperates with the air volume control valve to control the air volume of each drying barrel.

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