Effects of liquid nitrogen washing on methane
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During liquid nitrogen washing production, what impact does a significant increase in the CH4 and Ar contents in the system’s feed gas have on the long-term operation of the cryogenic tank?
It depends on the methane concentration; if it is higher than the saturated vapor pressure of methane at the minimum operating temperature, then methane may condense into a solid, causing blockages in the heat exchanger. Ar generally comes from upstream gasification; its most fundamental source is air separation. Its concentration is usually not very high, so it has almost no impact on liquid nitrogen washing.
Is the original poster trying to ask what effect the level of methane has on the cooling capacity of the cryogenic tank?
With all other components remaining unchanged, an increase in methane levels will inevitably lead to a rise in system temperature. The condensation of methane requires cooling energy, so it is necessary to increase the amount of nitrogen used for cooling or adjust the cooling balance
Is a methane content of 13% in the feed gas normal?