Working Principles of Dryair Products

1.Dehumidifying Principle:

In production processes, the passive effect of moisture on products has always been problematic…

Air dehumidification is a viable resolution and can be achieved by several methods: The first method is cooling the air below its dew point and removing moisture by condensation. This method is effective under conditions where the dew point is 8 – 10oC or more; the second method is absorbing the moisture by a desiccant material. Ceramic fibers of impregnated porous hygroscopic agents are processed into honeycomb-like runners. The dehumidification structure is simple, and can reach -60oC or less through special combination of desiccant materials. The cooling method is effective for small applications or where the humidity level is moderately controlled; for larger applications, or where the humidity level must be controlled to a very low level, desiccant dehumidification is required.

DRYAIR Systems utilize cooling method technology, as well as desiccant wheels of cellular structure. As shown in the figure, the motor drives the desiccant wheel to rotate 8 to 18 times per hour, and repeatedly absorbs moisture through a regeneration action, to provide dry air. The desiccant wheel is divided into the moisture area and the regeneration area; after the moisture in the air is removed in the moisture area of the wheel, the blower sends the dry air into the room. The wheel having absorbed water rotates to the regeneration area, and then regenerated air (hot air) is sent over the wheel from the reverse direction, expelling the water, so that the wheel can continue to work.

The regenerated air is heated with either steam heaters or electric heaters. Due to the special properties of super silicone gel and molecular-sieve in the desiccant wheel, DRYAIR dehumidifiers can realize continuous dehumidification under large amounts of air volume, and meet the requirements of very low moisture content. Through matching and combination, the moisture content of treated air can be less than 1g/kg of dry air (equal to dew point temperature -60oC). DRYAIR dehumidifiers deliver excellent performance is even better manifested in low humidity environments. To maintain a stable temperature of the dry air, it is advisable to cool down or heat up the dehumidified air by installing air-conditioning equipment or a heater.


2.Principle of VOC treatment equipment:

What is VOC concentrator?

VOC concentrator can effectively purify and concentrate VOCs laden air stream exhausted from industrial factories. By being combined with incinerator or solvent recovery equipment, both initial and operating costs of the entire VOC abatement system can be drastically reduced.

 VOC concentration rotor is made of honeycomb inorganic paper as a substrate, in which the High-Silica zeolite (Molecular Sieve) is impregnated. The rotor is divided into 3 zones such as process, desorption and cooling zones by the casing structure and heat resistance air sealing. The rotor is constantly rotated at the optimum rotation speed by a geared motor.

Principal of VOC concentrator:

When VOC laden exhaust gas passes through the process zone of the rotor which is continuously rotated, the incombustible zeolite in the rotor absorbs VOCs and purified gas is exhausted to the ambient; VOC absorbed part of the rotor is then rotated to the desorption zone, where the absorbed VOCs can be desorbed with small amount of high temperature desorption air and be concentrated to the high concentration level (1 to 10 times). Then, the high concentrated VOC gas is transferred to appropriate post treatment systems such as incinerators or recovery systems;the desorbed part of the rotor is further rotated to the cooling zone, where the zone is cooled by the cooling gas. A part of VOC laden exhaust gas from the factory passes through the cooling zone and is transferred to a heat exchanger or a heater to be heated and utilized as desorption air. 

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