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What is the structure and working principle of the adsorption type dehumidifier?

Desiccant type dehumidifier is also known as adsorption type dehumidifier. This series of technologies absorb water through silica gel and other adsorbents.

The liquid desiccant type dehumidifier absorbs moisture directly from air by utilizing the low partial pressure of water vapor of some liquid desiccants at room temperature to achieve the purpose of dehumidification. The liquid hygroscopicants used in liquid dehumidifier are calcium chloride, lithium chloride, triethylene glycol and other aqueous solutions. Due to the strong corrosiveness of calcium chloride and lithium chloride aqueous solutions to metals, their application will be affected if they are not properly solved.

The common SC type adsorption dehumidifier is a tower type air dehumidifier with spray cooling contact. Its structure consists of absorption device, regeneration device, auxiliary device and control system.

The hygroscopicity device is composed of intake louvers, dust filters, nozzles, coolers, liquid storage tanks, mist eliminators, etc. The whole hygroscopicity device can be divided into several parts according to its functions, such as filtration and spraying, cooling contact, liquid storage and mist removal.

The regeneration device consists of an air inlet shutter, a dust filter, a nozzle, a heater, a packing layer, a defogging condenser and a defogger. The regeneration device is divided into nozzles, heating contacts, liquid storage, mist removal and cooling parts.

The auxiliary system and control system are mainly composed of solution circulation, cooling water system, steam supply system and electrical control.

Principle of desiccant type dehumidifier: Moisture air to be treated enters the hygroscopic device through shutters and filters, contacts and mixes with high concentration triethylene glycol liquid coming out of nozzles, and exchanges heat and humidity on the outer wall of the supercondenser in a film-like flow. That is, triethylene glycol liquid with low water vapor partial pressure absorbs moisture in the humid air, releases heat of solution and latent heat of vapor liquid, and reduces humidity. The air is cooled and defogged into the air conditioning room. The hygroscopic triethylene glycol liquid is cooled and then flowed into the storage tank. It is mixed with the regenerated concentrated liquid and then transported by the solution pump. In the regeneration device, triethylene glycol dilute solution is heated by spiral plate heat exchanger, sprayed uniformly on the surface wall of the heater contactor, and mixed with the regenerated air filtered. At this time, the triethylene glycol solution is a dilute solution after heating. The partial pressure of water vapor is higher than that of regenerated air. The dilute solution absorbs moisture into the regenerated air and becomes a concentrated solution, which collects at the bottom of the device. After cooling, it flows into the liquid storage tank for further use. The regenerated air after hygroscopicity is discharged out of the room after removing a small amount of triethylene glycol vapor and droplets from the fog cooler and dust collector.

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