DEAR Liquid air separation unit.When operating the steam heater, pay attention to: always check the condensate water level of the steam heater. High water level will affect the temperature of heat exchange; when the steam heat exchanger leaks, it will affect the effect of heating regeneration. Therefore, the moisture content in the gas after heat exchange should be checked frequently. Generally, the moisture content should be less than 1 × 10-6 (dew point temperature - 65 ℃).DEAR Liquid air separation unit.There is water in the pipe and it cracks. When the heating is not complete, especially when the small pipe is blocked and the accumulated water can not be blown away, the small pipe may freeze and crack when the water at low temperature freezes into ice and the volume expands. There was a slight local explosion in the main cooler.When the specific enthalpy of the expander inlet is H1 and the specific enthalpy of the expander outlet is H2, the refrigerating capacity of unit quantity of gas is h1-h2. Given the temperature and pressure of the gas at the inlet and outlet of the expander, the corresponding specific enthalpy can be found from the thermodynamic property diagram of the gas.
DEAR Liquid air separation unit.Generally, the temperature of air entering the tower is set at 30 ℃. When the tower inlet temperature is higher than the design index, the throttling cooling capacity of compressed air will be reduced, and the temperature difference and heat load at the hot end of the switching heat exchanger will be increased, resulting in the increase of cooling loss and energy consumption.DEAR Liquid air separation unit.Incomplete heat exchange loss Q2 (or Q2). The cooling capacity of low temperature gas is recovered by each heat exchanger in the device. Ideally, the low temperature backflow gas leaving the unit should be reheated to the same temperature as the positive flow gas entering the unit. That is to say, only when the temperature difference at the hot end reaches zero can all the cold energy be recovered. However, heat can only be transferred from high-temperature objects to low-temperature objects. In order to transfer heat from high temperature material to low temperature material in heat exchanger, there must be temperature difference. The temperature difference △ t at the hot end reflects that the temperature of the low temperature gas in the unit is lower than that of the air entering the unit, that is, the cooling capacity cannot be fully recovered, and the cooling capacity loss is called "incomplete heat exchange loss". It is proportional to the temperature difference.
When the refrigeration capacity needs to be increased in operation, it is difficult to increase the unit refrigeration capacity only by increasing the temperature in front of the expander without increasing the expansion capacity. When liquid products are produced, the liquid will move the cooling capacity Q0 directly out of the device, and the device needs to increase the same amount of cooling capacity to maintain the balance of cooling capacity.DEAR Liquid air separation unit.The working temperature range of molecular sieve is generally 8 ~ 15 ℃, which can work normally. Once beyond this range, the loading capacity will increase, the adsorption effect will decrease, and even the adsorption effect will lose. When the chiller fails, the temperature of the air entering the molecular sieve adsorber increases.Safety valve is an automatic valve, its function is to ensure that the machine or equipment will not be damaged due to overpressure. When the working pressure P ≥ 0.6MPa, the take-off pressure of the safety valve should be 1.05 ~ 1.1 times of the working pressure; when the working pressure P < 0.6MPa, it should be 1.2 ~ 1.25 times of the working pressure.
