DEAR Air separation equipment.For all kinds of heat exchangers in air separation unit, the heat transfer area has been determined. However, if a part of the channel of plate heat exchanger or a part of the tube (or coil) of tube heat exchanger is blocked due to leakage in use, the heat transfer area will be reduced and the heat transfer will be reduced.DEAR Air separation equipment.In the third stage of passing through the CO2 freezing zone, when the outlet temperature of expander drops below - 150 ℃ to - 165 ℃, more CO2 is released. Therefore, when the temperature does not drop to this value, the bypass valve can be opened; when the temperature reaches - 150 ℃, the bypass valve and circulating current can be closed, so that it can quickly pass through the carbon dioxide freezing zone without blocking the expander.If the effective energy of the environmental state is zero, the air is separated into oxygen and nitrogen, that is, in an unbalanced state with the environment, it needs to consume energy, that is, the separated product has effective energy. Because the raw air is in the environmental state, its effective energy is zero.
When the main cold liquid level reaches the normal level, the infusion can be stopped, and the air separation column can enter the purification stage. With this infusion technology, the starting time can be shortened by more than 12 hours. The source of the liquid can be provided by another air separation unit in operation; the liquid can be discharged into the storage tank for standby during shutdown; the liquid can also be introduced by pressurizing the low temperature liquid oxygen storage tank.DEAR Air separation equipment.The heat removed from the unit is (H ′ 4-h ′ 2), which is the cooling capacity of throttling effect at that time. This shows that the cooling capacity of throttling effect still exists in non isothermal compression, but it does not exist in the compression process. The compression process is to create conditions for throttling and cooling.DEAR Air separation equipment.When the heat flow is out of date, the heat (cold) storage body releases cold capacity (or heat storage), the temperature increases, and the temperature of the heat flow body decreases due to heat release. The cold fluid and the hot fluid do not contact each other, but indirectly transfer the cold quantity from the cold fluid to the hot fluid through the heat storage body as the medium.
DEAR Air separation equipment.Neon and helium occupy part of the condenser, so the heat exchange area can not be fully utilized. The more neon and helium are accumulated, for example, about 6m3 of neon and helium are accumulated at the top of the main cooling system of 6000m3 / h oxygen generator in 8h. So many non condensable gases will seriously affect the normal operation of the condensing evaporator.DEAR Air separation equipment.The water injection hole of the chilled water distributor is blocked, which causes the water level in the chilled water return tank to overflow to the orifice of the riser, and part of the water is carried into the purifier by air; too much spray water or poor separation effect of the water separation device (including the water capture layer on the top of the tower or the separate water separator) will also cause water entrainment;The temperature difference between hot end and cold end should be well controlled in operation. When adjusting, it is necessary to keep the temperature difference between the cold end and the hot end within the maximum allowable temperature difference range of self-cleaning, and not only reduce the temperature difference between the hot end and the cold end.
