Answer: Regeneration gas is also called cleaning gas. Its function is to desorb the water adsorbed by the desiccant and take it out of the drying tower. Different regeneration methods determine the different regeneration gas reflux ratios selected. Heatless regeneration drying requires a large amount of regeneration gas because all the desorption energy it needs comes from the finished gas. This is based on the principle of equal volume flow rate in the adsorption and regeneration towers, that is, the total amount of desorbed water during regeneration and cleaning is equal to the total amount of adsorbed water during operation. About half of the desorption energy of micro-heat regeneration is taken from the finished gas, and half is taken from the electric heater. The required regeneration gas consumption (including waste heat regeneration and cooling) is about 7%. Most or all of the desorption energy of the hot dryer is taken from the heated ambient air, but the cooling stage still uses all product gas. The regeneration gas reflux ratio is about 4%~6%. There is also the so-called "zero emission", that is, both regeneration and cooling use ambient air, without any product gas loss.
It is worth noting that the instantaneous flow rate of the micro-heating regeneration gas cannot be too small, otherwise it will reduce the heat transfer efficiency of the regeneration gas as a heat carrier, causing local overheating and large-scale heatlessness, destroying the adsorbent structure and performance. At the same time, if the flow rate is too small, the flow rate will be too low, which is easy to form a "flue effect" due to the short circuit of the airflow through the adsorption layer, resulting in uneven heat transfer and effective desorption.
