Introduction to the working principle of heating adsorption dryer

　　Although the working principle of heated adsorption dryer is different from that of heatless regeneration, there is no significant difference between the two processes. The heat required for heating and regeneration is provided by an external heat source. In addition, a set of air supply equipment is required to send the heat to the adsorption bed.
　　The function of the heated adsorption dryer is to dry the water in the compressed air, so that the quality of the compressed air can reach the standard.When the effect of the dryer is not good, we should find out the cause in time and solve the problem from the root cause. Pollution caused by adsorbent degrades performance: the intake filter oil is not completely soiled, the filter element should be replaced and the adsorbent should be replaced at the same time. Excessive processing capacity: It should be adjusted according to the rated processing capacity of the dryer.Intake air temperature is too high: Check the cooling effect of the cooler at the rear of the air compressor to make the temperature of the air entering the dryer ≤40 ° C. Inlet air pressure is too low: Check if there is something wrong with the air compressor, adjust to the outlet pressure to 0.7MPa.The regeneration effect is not good: the regeneration gas volume is small, the regeneration time is appropriately extended, the regeneration exhaust resistance is large, and the muffler is cleaned. The electrical system is faulty and the valve action is inaccurate: check that the PLC performs the prescribed action.
　　The program controller of the heated adsorption dryer not only needs to orderly switch the action sequence of each valve, but also controls the heating temperature. The temperature is too low to desorb and desorb the adsorbent. If the temperature is too high, the adsorbent is liable to deteriorate and deteriorate.In addition, a cooling program must be set up. It is most convenient for the cooling air to be provided by the dryer itself, which is very important in the process control process. The amount of cooling gas and cooling duration will directly affect the regeneration energy consumption of the dryer and the dew point index of the finished gas, which is obviously different from the athermal regeneration process.
　　When the compressed air to be dried is in full contact with the adsorbent, water molecules in the air diffuse onto the adsorbent and are adsorbed due to van der Waals' gravity. When the temperature and pressure change, the amount of water absorbed changes accordingly. When the compressed air passes through the adsorbent layer, the water molecules in the compressed air are dried by being adsorbed by the adsorbent.
　　The heated adsorption dryer uses part of the dried air to expand to atmospheric pressure and heat under reduced pressure. This pressure change and temperature change make the air drier, and then let it flow through the desiccant layer that needs to be regenerated without being connected to the air stream. The regeneration gas removes the water from the desiccant and takes it out of the dryer.