The mixed refrigerant undergoes a phase change process through the J-T valve
Thread Content
Will the liquid refrigerant vaporize when passing through a J-T valve? The main refrigerants include methane, propane, isopentane, ethylene, and nitrogen
Before entering the cold box, the refrigerant is in liquid form (mainly isopentane, propane, and ethylene)； (The main function lies in the pre-cooling section; in this section, the coolant is in liquid form before the JT valve, and it vaporizes after throttling. However, improper operation can also lead to the accumulation of backflow coolant.) ； Gaseous refrigerants (methane, nitrogen, some ethylene ； Its main function is in the deep-cold section at the bottom of the cryogenic box); the gaseous refrigerant becomes liquefied as it enters the bottom of the cryogenic box and reaches the JT valve, and it vaporizes again after passing that valve – especially nitrogen. Subsequently, the various components of the refrigerant vaporize one after another due to the temperature gradient. Controlling the temperature of the cryogenic box relies primarily on adjusting the composition of the refrigerant and the opening degree of the JT valve
Yes, the reason was explained clearly upstairs; it’s just that simple.