Problems with refrigerant heat exchange
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Our plant is a facility that converts coke oven gas into liquefied natural gas. The refrigerants used include nitrogen, methane, ethylene, propane, and isopentane. When the temperature of the refrigerant entering the cold box rises, the temperature at the upper part of the cold box actually decreases. The temperatures before and after the liquid-phase throttle valve both show a downward trend, while there is no significant change in the temperatures before and after the gas-phase throttle valve. The temperature of the refrigerant exiting the cold box increases. I would like to ask what causes this phenomenon – why does the temperature at the top of the cold box drop?
When the pressure in the cold box is high, the temperature also rises, as the compressor does more work; with high pressure, the throttling effect is significant and the temperature decreases
There’s no significant change in the refrigerant pressure