In the switching heat exchanger, moisture and carbon dioxide cannot be completely and thoroughly removed. Although the remaining amount is very small, it will gradually block the switching heat exchanger over time. In the production, it shows that the resistance of switching heat exchanger increases continuously, the free section of gas flow decreases, and the air volume cannot enter. In addition, in the cold section of the switching heat exchanger, carbon dioxide has been basically cleaned up theoretically, but due to the clamping effect of air flow, the amount of carbon dioxide brought into the tower is much more than the theoretical content. Apart from being partially cleared by the adsorption filter, the rest of the carbon dioxide will gradually accumulate in the tower and block the tower plates, pipelines and valves. In addition, the air also contains a small amount of acetylene and hydrocarbon. Although adsorbed by acetylene adsorber, its adsorption efficiency can only reach about 97%, and the rest will also threatenAir separation equipmentSafe production. In order to eliminate these accumulated impurities such as water, carbon dioxide and acetylene, whenAir separation equipmentWhen it runs to a certain period of time, it needs to stop the car for heating and blowing.
In addition, inAir separation equipmentDuring the operation, sometimes it is forced to stop for maintenance due to equipment or machine failure, in order to eliminate low temperature, it must be heated and blown off. Before all the installation of the air separation plant is completed and the commissioning is started, in order to remove the remaining impurities and moisture in the equipment, heating and blowing operations are also needed.
As for the equipment (such as liquid-air adsorber) used for monomer replacement, when the silica gel is saturated by acetylene and carbon dioxide, in order to recover its adsorption capacity, heat and regenerate it regularly. When the expansion filter and expansion machine are frozen by carbon dioxide, in order to thaw, monomer heating operation is also needed.
