A brief overview of the application status and energy-saving and emission-reduction trends of adsorption dryers without energy consumption
Currently, the power consumption of various compressors in use in China accounts for nearly 10% of the country's total power generation, and the accompanying Heatless regenerative adsorption dryer Mainly uses non-thermal regeneration and micro-thermal regeneration, with regeneration energy consumption as high as 15%~20%. Energy-saving blowers and heat-compression dryers, which have been vigorously promoted in recent years, also have certain application limitations and need to be improved and modified according to different regions and uses. In order to further pursue energy saving and emission reduction, some new technologies and processes have been developed and applied, such as zero emissions.
1. Heatless regeneration of heatless regenerative adsorption dryers: Also known as self-heating regeneration. Advantages: simple structure, low manufacturing cost, convenient operation and maintenance. Disadvantages: Energy consumption is as high as 15~20% (regeneration gas 14%, switching displacement 2%, no-load adjustment loss 3~5%), and all are compressed air products, generally limited to small-scale applications, such as less than 10m3 per minute for single units abroad, and applications in air compressor stations above 40m3 should be restricted.
2. Micro-thermal regeneration of heatless regenerative adsorption dryers: This type has been differentiated into two levels in the market. One type has basically the same external dimensions and adsorbent filling amount as the non-thermal regeneration type, but with an added small heater, heating temperature 70~90℃, and a slightly longer adsorption cycle than non-heated regeneration (generally about 5 minutes for non-heated regeneration, and about 10~15 minutes for this type of micro-heating), so it can also be simply called "short-process micro-heating". The amount of regeneration gas for this type remains at around 15%.
Heatless regenerative adsorption dryer Manufacturers indicate that due to the need to increase cooling time and further consume regeneration gas and heater energy consumption, the total energy consumption is generally about 10% higher than that of the non-heated regeneration type. Heatless regenerative adsorption dryer manufacturers indicate that from the perspective of energy saving and consumption reduction, there is nothing to recommend. However, high-pressure and cold-drying adsorption is another matter, as the starting points are different. Opposite to "short process, small micro-heating", it is another type of micro-thermal regeneration dryer with overall size, loading capacity, adsorption cycle, and heating power close to external heating.
Theoretically, its energy consumption is half that of non-thermal regeneration gas and half that of external thermal regeneration. If the design and control are fully optimized, the total energy consumption may be about 10% less than that of non-thermal regeneration. Micro-thermal regeneration still consumes a large amount of product gas, while other types with heat recovery have a more significant advantage in energy saving and consumption reduction, and therefore have been eliminated first abroad.
3. Heatless regenerative adsorption dryer External heating: High-pressure blowers (centrifugal or vortex type) are mostly used to provide power, and are sucked into the atmosphere to heat for regeneration, and the decompressed product gas is used for air cooling. The energy consumption is about 50% lower than that of non-heated and micro-heated air compressors, and it can adapt to various types of air compressors. The regeneration energy can be adjusted according to the changes in air compressor load, further achieving energy saving and emission reduction.
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