Why are desiccant regenerative adsorption dryers energy-efficient?
Zero-purge regenerative adsorption dryer It can only be used when a lower dew point temperature is required. Depending on the regeneration method of the adsorption dryer, it can be divided into non-thermal regeneration dryers, micro-thermal regeneration dryers, blower heating regeneration dryers, and compressed heat regeneration dryers.
The working principle of a zero-purge regenerative adsorption dryer is to compare the energy consumption of various dryers based on engineering examples. This article mainly discusses the problems existing in the engineering application of zero-purge regenerative adsorption dryers and solves the problems from two aspects: engineering design optimization and equipment process transformation.
I. Zero-purge regenerative adsorption dryer Working principle
Adsorption dryers generally adopt a dual-tower structure, one for gas drying and the other for adsorbent regeneration. Commonly used adsorption materials include activated alumina and molecular sieves. Activated alumina is very sensitive to the temperature of the working medium. When the ambient temperature of the adsorbent reaches above 130℃, the water content of the adsorbent is only about 1%, and it is almost completely desorbed. At the same temperature, the adsorption capacity of molecular sieves for water is higher than that of activated alumina, and the desorption is not as complete as that of activated alumina.
The adsorbent regeneration process is divided into four stages: heating-depressurization-cold blowing-pressure equalization. The adsorption tower and regeneration tower switch according to the control signals given by the dryer PLC.
High-temperature compressed air (above 110℃) enters the dryer and then directly flows into the regeneration tower. Because the high-temperature compressed air is unsaturated, it will evaporate the water stored in the adsorbent. The vaporized water is adsorbed by the unsaturated high-temperature compressed air, enters the subsequent setting cooler of the dryer, and is cooled to about 40℃. At this time, the compressed air is in a supersaturated state and releases a large amount of liquid water, which is discharged through the gas-liquid separator. After cooling, the compressed air enters the drying tower. After reaching the dew point requirement, most of it is output to the compressed air network for use by the workshop and various gas stations. A small part flows into the regeneration tower through the adsorbent cold blowing control valve. In this stage, the consumed compressed air accounts for about 2% of the total gas volume. Since the compressed air used for cold blowing is dry compressed air, the adsorbent can be desorbed. After the cold blowing process is completed, this part of compressed air is discharged through the silencer.
The regeneration tower and the adsorption tower need to go through a pressure equalization process before switching. This process is controlled by the dryer PLC control program. Each switch means that the dryer goes through a complete working cycle. The control methods generally include dew point control and time control.
The compressed air entering and leaving the dryer is a continuous process, while the dual-tower switching of the dryer is an intermittent process, so the two are not synchronized. During the cold blowing process of the regeneration tower, the high-temperature compressed air entering the dryer bypasses and directly enters the aftercooler and gas-liquid separator, and then enters the drying tower. These processes are realized through the dryer control program.
II. Power Consumption Comparison of Zero-Purge Regenerative Adsorption Dryers
In order to compare the energy consumption of several commonly used adsorption dryers, this article briefly introduces the regeneration process of other dryers.
Zero-purge regenerative adsorption dryer The regeneration process does not require heating. After the purified compressed air treatment section is depressurized, it flows into the regeneration tower. The adsorbent is desorbed by the principle of pressure swing adsorption. The regenerated compressed air carries away the moisture in the adsorbent and is discharged through a silencer.
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