Why is low-value control chosen for the BOG compressor tank pressure control and the operating condition correction of the recondenser?

2021-08-20View Original

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The BOG compressor is used to control the tank pressure; if the operating conditions of the condenser are unstable, it is necessary to adjust the load on the compressor. The bypass flow rate of the recondenser, the recondenser level, and the subcooling degree of the LNG in the high-pressure pump inlet manifold are compared using a signal low selector and a signal high selector for the pressures of the four LNG storage tanks; the lower of these values is then selected to adjust the load of the vapor compression compressor. I’m wondering why this low value is chosen here to control the load in the end. I’m seeking help from everyone; it’s been bothering me for a long time

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Why is low-value control chosen for the BOG compressor tank pressure control and the operating condition correction of the recondenser?

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