Application of auxiliary condensing evaporator in liquid air separation plant

The nitrogen from the top of the upper tower is piped through the nitrogen gas pipeline, reheated through the main heat exchanger of the colder tower, and a portion of the nitrogen is pumped out, then combined with the first pipeline and a portion of the nitrogen vaporised in the liquefier in the third pipeline before going to the main vessel. The first raw material air pipeline is heated up and out of the cold box in liquid air separation plant, then goes to the high pressure heat exchanger of ...

When the main condenser evaporator leaks seriously, a large amount of high-pressure nitrogen will leak to the low-pressure oxygen side, and the pressure of the upper and lower columns and the purity of the product will change significantly until normal production cannot be maintained. When the main condenser evaporator leaks slightly, the pressure of the upper and lower columns will not change significantly, and the purity of liquid oxygen in the main condenser evaporator will not decrease significantly. The common phenomenon is that the purity of the gas and liquid oxygen in the main condensing evaporator is very different, and the gas concentration is lower than that in equilibrium with liquid oxygen. For example, the concentration of liquid oxygen is 99% and that of gaseous oxygen is 96%, that 7 main cooling pipes were found to be leaking during maintenance. The common causes of leakage are as follows: 1. Pipes are worn due to mutual vibration. For long tube condensing evap