Desiccant Dehumidifier Industrial

DESICCANT DEHUMIDIFIER INDUSTRIAL

Analysis of the development status of the rotary dehumidifier

The development of rotary dehumidifiers abroad began in Sweden in the 1960s, and domestic development began in the 1980s. In a few developed countries such as the United States, Japan, and Sweden, a single lithium chloride dehumidification wheel has been developed to a variety of dehumidification runners such as active silica gel, molecular sieves, and organic synthetic materials. However, domestic limited to many reasons, only The lithium chloride dehumidification runner tends to be mature, and the silica gel and molecular sieve materials are extremely immature.

According to the production and sales of dehumidification runners and the whole machine accumulated experience: in normal use (by 300 days a year, 8 hours per day, temperature requirements 20-45% range), the use of domestic dehumidification runners The life span is two to three years. With the increase of the use time, the moisture absorbent will gradually attenuate or fall off until the temperature of the dry air outlet reaches the user's demand. At this time, the dehumidification runner needs to be replaced.

The hygroscopic material of the domestic dehumidification runner is lithium chloride. As for the active silica gel and molecular sieve, the immature products are all immature. Any synthetic dehumidification wheel that promotes domestic active silica gel and molecular sieve or the above three moisture absorbents has the concept of hype and misleading. The suspicion of consumers is not worthy of scientific scrutiny. As a very simple example, the regeneration temperatures of the three materials are different after moisture absorption, especially when lithium chloride is separated by a temperature of 140 ° C, and the active silica gel and molecular sieve The regeneration temperature must be 140~C and 160'C respectively, what is the regeneration temperature of the three materials combination? Adsorption separation technology and nanomaterials, genetic engineering, membrane technology, supercritical fluid Extraction technology is also the category of high technology in today's world. Rotary dehumidification is an adsorption separation technology. At present, Japan, the United States, Sweden and other countries have successively developed non-corrosive active silicon limbs and molecular sieve dehumidification runners to replace lithium chloride. Dehumidification runners, and domestic research in this area can be said to be a blank.

At normal temperature, ie 20-25C, the active silica gel dehumidification wheel is used in a wide range of applications where the humidity requirement is 10%-50%, while the molecular sieve dehumidification wheel is used in the temperature requirement of 1%-10%. Craft occasions. The service life of imported active silica gel and molecular sieve dehumidification runners is generally more than five years. Compared with domestic dehumidification runners, the initial investment is higher, but considering the future maintenance cost and service life, the performance price is compared with domestic chlorine. High lithium. Furthermore, the moisture absorbing material of the imported active silica gel and the molecular sieve dehumidification runner is directly burned in the inside of the special ceramic fiber, which is not peeling off and is not corrosive. The moisture-absorbing agent of the domestic active silica gel dehumidification runner is adhered to the surface of the glass fiber paper, and the moisture absorption effect is extremely poor and easily falls off; the lithium chloride dehumidification runner causes the regeneration fan and the exhaust gas pipeline due to the corrosive characteristic of the lithium chloride. Extremely corrosive; lithium chloride dehumidification wheel and the disadvantage of not being able to contact with supersaturated air for a long time.

Because lithium chloride is very soluble in water. Corrosive and short service life is the direct cause of the elimination of the lithium chloride dehumidification runner. During the normal service life, after several actual tests, the dehumidification performance of the domestic lithium chloride dehumidification runner (thickness 400mm) and the imported active silica gel dehumidification runner (thickness 200mm) of the same diameter are almost the same. Because of the difference between the domestic and imported manufacturing processes, the diameter of the domestic honeycomb hole is larger than that of the imported one. In order to increase the moisture absorption surface area, the thickness of the domestic dehumidification runner has to be increased.

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