What other factors are relevant to the actual operation of LNG refrigerant mixing besides the specified mixing ratio?
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After all, the parameters for the refrigerant ratio are only for reference; then how is the temperature drop in the layout and that in the cold box controlled, and how is the temperature adjusted? Please ask an expert to explain
It is necessary to consider the temperature gradient in the cold box, as well as the temperature difference between the cold and hot ends of the plate heat exchanger. It’s important to understand the temperature range in which each refrigerant is most effective. Control is primarily achieved through throttle valves, in conjunction with the refrigerant compressor; return valves also play a role. Attention should also be paid to the resistance associated with the plate heat exchanger. The cooling capacity is determined by the compressor power, flow rate, throttling pressure difference (temperature and temperature difference), and the composition of the refrigerant
It’s covered very comprehensively. Anyway, there’s no fixed standard for this; what suits one person is the best
The throttle opening, as well as the refrigerant composition, have an impact on the cryogenic tank gradient
Could you explain the formula behind that?
In simple terms, the cooling capacity required for natural gas liquefaction is provided by the compressor, and this is achieved through throttling. The amount of cooling capacity is proportional to the flow rate of the refrigerant and the pressure difference before and after throttling; it also depends on the composition of the refrigerant
The refrigerant components primarily affect the temperature gradient and the useful work of the compressor; it is necessary to experiment to find components that suit one’s specific operating conditions