Abstract
Adsorption dehumidification and drying equipment is essential general equipment for domestic and industrial use. The most commonly used type in industry is the compressed air adsorption dryer. The analysis results show that the heat loss of the traditional heat air regeneration system of the compressor dryer is 39.4%, and the exhaust waste heat is 32.4%. The actual use of heat energy for desiccant regeneration is only 28.2%. Therefore, this study uses an innovative electrothermal adsorbent unit (ETAU) to regenerate the desiccant. By directly heating the adsorbent, heat loss can be effectively improved. On the other hand, the composite arrangement of zeolite and activated alumina is used. The inlet compressed air is firstly treated by the activated alumina, which has a high adsorption capacity in the high relative humidity condition, then a zeolite is used as a second part to make the dew point reach –40 °C. In the regeneration step, the airflow direction is reversed, whereby the zeolite is regenerated by the ETAU, and the waste heat of the exhaust air is used to regenerate the activated alumina, which reduces the temperature of the exhaust air. Compared with the traditional heat air compressed air system, the two technologies can save about 27% energy in total.
Highlights
Dry compressed air, one of the four primary dynamic sources in industrial plants, is used for various industrial applications, such as in high-tech cleaning processes, drying and cleanliness control, car panel beating and painting processes, food manufacturing, pharmaceutical manufacturing, and energy storage [1,2,3,4]
In the refrigeration dehumidification method, the operating temperature cannot be less than 0 ◦C; an adsorption dehumidification method unaffected by temperature constraints is necessary for compressed air drying processes
The other energy consumption problem of compressed air dryers is that exhaust air temperature is too high
Summary
One of the four primary dynamic sources in industrial plants, is used for various industrial applications, such as in high-tech cleaning processes, drying and cleanliness control, car panel beating and painting processes, food manufacturing, pharmaceutical manufacturing, and energy storage [1,2,3,4]. All desiccants tend to saturate after adsorption, and air with low relative humidity [8] or high temperature [9] must generally be used to regenerate adsorbents. The other energy consumption problem of compressed air dryers is that exhaust air temperature is too high This can be alleviated by replacing a portion of the zeolite desiccant packed-bed with activated alumina desiccants. It assumes the packing bed as a cylinder of porous medium with known dimensions and physical properties. It can be seen that at the end of the regeneration process, the air temperature drops to 86 °C at a position 30 cm downstream from the bed inlet, which indicates the limit length of the activated alumina packed-bed in our hy6borfi1d8 system. Ftiiognuprreoc7e.ssA. ir temperature distribution in the adsorbent packing bed at the end of the p3r.oEcleesctsr.othermal Adsorbent Unit (ETAU) Manufacture
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