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Classification of compression hot air dryers
The principle of compressed air reducing the pressure dew point (PDP) of the compressed air environment is used in practical applications for drying and dehydration to measure the performance of the dried product. Currently, the measurement standard for the compressed air quality and water content in all related industries and applications is ISO 8573-1:2010. This standard specifies 6 levels of compressed air pressure dew point (PDP) from -70 ℃ to 10 ℃. The lower the pressure dew point (PDP) value, the higher the compressed air quality requirements, and the drier the compressed air. Let's take a look at the classification of compressed air dryers!
The principle of reducing the pressure dew point (PDP) of compressed air is used in practical applications for drying and dehydration to measure the performance of dried products. Currently, the measurement standard for compressed air quality and water content in all related industries and applications is ISO 8573-1:2010. This standard specifies 6 levels of compressed air pressure dew point (PDP) from -70 ℃ to 10 ℃. The lower the pressure dew point (PDP) value, the higher the compressed air quality requirements, and the drier the compressed air. Let's take a look at Compressed Heat Dryers Classification!
Types and Selection of Compressed Heat Dryers
According to the different basic principles and technologies of drying work, compressed heat dryers are usually classified into refrigeration dryers, adsorption dryers, and membrane dryers. Water below 0℃ will change from liquid to solid state, which is freezing. Therefore, for refrigeration dryers, it is not only necessary to achieve drying treatment effect below 0℃, but also to continuously improve the drying method with pressure dew point temperature below 0℃. We can choose adsorption dryers and membrane dryers.
Refrigeration dryers: Cool the compressed air to a dew point of 3-10 °C (different brands of refrigeration dryers have different exhaust pressure dew points; the lower the exhaust pressure dew point, the better the performance of the refrigeration dryer), and the water vapor in the compressed air condenses into liquid water and is discharged separately, thus achieving the purpose of drying compressed air;
Adsorption compressed heat dryers: When humid compressed air passes through different adsorbents (usually silica gel, molecular sieve, activated alumina), the moisture in the air is adsorbed, thus drying the air. To obtain compressed air with a pressure dew point significantly below 0℃, according to the ISO8753 standard, the main design parameters usually include -20℃, -40℃, and -70℃ specifications. After the adsorbent adsorbs water vapor, it needs to be regenerated periodically to restore its drying capacity. According to the regeneration method of the adsorbent, adsorption dryers can be classified into the following categories:
- Non-heat regeneration dryer
- Heating (micro-heating) regeneration dryer
- Blower heat regeneration dryer
- Compressed heat regeneration dryer
Membrane compressed heat dryers: Membrane dryers are equipped with thousands of small hollow polymer fiber tubes with inner coatings. These fiber tubes have selective permeability. When compressed air flows through these small fiber tubes, the water vapor in the compressed air will penetrate the membrane wall, while the compressed air continues to pass through, thus effectively achieving the purpose of water separation.
Compression hot air dryer
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