A Brief Discussion on Adsorption Materials of Dehumidification Rotors

The dehumidification rotor is a highly efficient dehumidification equipment. The dehumidification rotor is divided into an adsorption zone and a regeneration zone. In the adsorption zone, the special adsorption material in the rotorabsorbs moisture in the air to dry the air. When the rotor rotates to the regeneration zone, the moisture in the adsorption material is released by heating and other methods, thereby realizing the regeneration of the adsorption material so that it can continue to perform dehumidification work. This article takes you to briefly discuss several common adsorption materials for dehumidification rotors.

The emergence of adsorption materials for dehumidification rotors is mainly to meet the need for efficient dehumidification. In industrial production, many processes have very strict requirements for air humidity. For example, in the electronics industry, excessive humidity may cause damage and short circuits to electronic components, affecting product quality and production efficiency. In the production and storage of food and drugs, inappropriate humidity will lead to product deterioration and mildew. Traditional dehumidification methods, such as condensation dehumidification, are less efficient in some low-temperature and low-humidity environments.And the adsorption material of dehumidification rotor can deal with these problems well. Its adsorption principle is based on the adsorption of water vapor by adsorbents (such as silica gel, molecular sieve, etc.). The rotor continuously rotates, so that the adsorption and regeneration processes can be carried out continuously, and the air humidity can be effectively and continuously reduced, so it has been widely used.

There are mainly the following common adsorption materials for dehumidification rotors:

I. Lithium chloride:

Advantages: It is a moisture-absorbing salt with a high moisture content, has high chemical stability and strong sterilization ability. It is widely used in the field of dehumidifiers, especially in the pharmaceutical, food and other industries with high requirements for air cleanliness and humidity.

Disadvantages: The dehumidification capacity is small and the dehumidification ability is low in the low humidity range. When it absorbs moisture, it is easy to form a liquid and escape from the matrix, which will corrode the metal around the dehumidification equipment. This largely limits its usage in dehumidifiers.

II. Silica gel:

Advantages: It is a solid adsorbent that has been studied and applied more after lithium chloride. It always remains solid during the adsorption and desorption processes and has good physical and chemical stability. When the dehumidification efficiency is affected by dust or oil stains on the surface of the rotor, it can be directly cleaned with clean water or detergent to restore it, and the maintenance is relatively convenient.

Disadvantages: In terms of moisture absorption capacity and regeneration energy consumption, it is slightly worse than lithium chloride.

III. Zeolite molecular sieve:

Advantages: It can still absorb moisture in a low humidity environment and is very suitable for deep dehumidification at low dew points. It can still maintain a good water absorption rate at a higher temperature. It is widely used in some cases where the humidity requirements are very low and the ambient temperature is relatively high, such as in electronics and precision instruments. The air dew point at the outlet of the rotor dehumidifier using molecular sieve can reach -60°C.

Disadvantages: Compared with silica gel and lithium chloride, the cost may be higher.

In addition, some new composite adsorption materials are constantly being developed and applied. These materials combine the advantages of multiple single adsorption materials to improve the performance of dehumidification rotors.