How to determine whether a warped plate heat exchanger is leaking?
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This air separation unit features high and low pressure heat exchangers, which are difficult to control, resulting in frequent heating during shutdowns?
When pressure leaks from high to low, the change in oxygen purity in the low-pressure pipeline can be observed: for example, there are purity measurement points both at the inlet and outlet of the heat exchanger for contaminated nitrogen and low-pressure nitrogen. Also, regarding parking, we should consider whether pressure retention is possible; let’s see if it’s feasible to maintain the pressure. If pressure leaks out immediately, I’m not sure what to do.
Agree with the person above; pressure can be maintained after sand removal. Test it with soapy water – internal leakage indicates the purity level
Main identification methods: 1. Internal leakage definitely involves flow from high pressure to low pressure; check the purity of the low-pressure fluid. If there is a large leakage, the flow rate of the high-pressure fluid will also change. 2. Judgment is made based on the temperature difference across each heat exchanger. 3. If the leakage is from the heat exchanger outward into the pearlescent sand, check whether there is ice formation on the walls of the cold box. At the same time, check the pressure changes inside the cryogenic tank (the pressure after filling it with nitrogen or an inert gas); if low-temperature fluid leaks into the perlite, the temperature will rise and the pressure will increase as well. Analyze the gas composition in the gaps of the cold-direction internal pearlescent sand to determine the location of the leak.