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How should adsorption dryers be configured and selected?


The accurate use of adsorption dryers is a prerequisite for obtaining the desired compressed air standard, reducing regeneration power consumption, and extending equipment life. Before using adsorption dryers, it is essential to understand how to select and configure them. The configuration of adsorption dryers and motor selection should be considered from the following aspects:

  The accurate use of adsorption dryers is a prerequisite for obtaining the desired compressed air quality standards, reducing regeneration energy consumption, and extending equipment life. Before using adsorption dryers, it is essential to understand how to select and configure them. The configuration of adsorption dryers and motor selection should be considered from the following aspects:

  1. Adsorption Dryer Configuration

  Generally, adsorption dryers are rarely used directly. In all air compressor systems, adsorption dryers are usually used in conjunction with filtration systems. This not only meets the requirements of air quality but also the normal operating requirements of adsorption dryers.

  2. Selection of Adsorption Dryers

  Select based on the company's compressed air requirements. Dew point is the standard for indicating the quality of compressed air. Generally, the lower the pressure dew point, the higher the quality. However, not every company needs high-quality compressed air. Some companies only need to use compressed air at -20°C for cleaning, while others need compressed air at -70°C to control pneumatic components and smart switches, etc.

  There are two ways to select adsorption dryers: finished air dew point and regeneration energy consumption are two major factors to consider when selecting adsorption dryers. Generally, these two cannot be considered together; that is, to obtain low-dew-point compressed air, more energy consumption is required.

  According to adsorption theory, the basic types of adsorption dryers are only heatless regeneration and heat regeneration. Since heatless regeneration dryers use a short-cycle operation system, their compressed air dew point is better than heat regeneration dryers in terms of depth and stability, and the regeneration energy consumption is very close to the theoretical minimum.

  The general working principle of an adsorption dryer is simple: moist air flows through a desiccant (usually silica gel, molecular sieve, activated alumina) and is dried there. Water vapor transfers from the moist compressed air to the desiccant or "adsorbent," gradually saturating the adsorbent with adsorbed water.

  Therefore, the adsorbent needs to be regenerated periodically to restore its drying capacity. Thus, adsorption dryers usually have two drying vessels: one vessel dries the incoming air, and the other is being regenerated. When one vessel "tower" is finished, the other vessel "tower" takes over. Typically achievable PDP is -40°C, and these dryers can provide sufficient dry air for more demanding applications.

Adsorption dryer

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