Calculation method of liquid-gas ratio in recondenser of lng receiving station

Abstract

The invention relates to a calculation method of a liquid-gas ratio of a recondenser of a LNG (Liquefied Natural Gas) receiving station. The calculation method comprises the following steps: determining parameters which have influences on the liquid-gas ratio of the recondenser: temperature of BOG (Boil-Off Gas) to be treated, flow of the BOG to be treated, inner pressure of the recondenser, content of nitrogen gas in the recondenser and feeding density of the recondenser; giving a quantified calculation formula: R=TBOG*0.05+(FBOG-11)*0.207+(0.76-P)*10.5336+(0.6-d)*88+(N-0.1)*0.1+7.15. According to the calculation method provided by the invention, the factory automation degree can be improved, and the time and energy of operators are greatly saved; the BOG treatment effect and the safety of a receiving station technology can be effectively ensured; the economic loss caused by parking and equipment fault risks is reduced.

Description

technical field [0001] The invention relates to a process of receiving, storing and transporting liquefied natural gas, in particular to a method for calculating the liquid-gas ratio of a recondenser of an LNG receiving station. Background technique [0002] At present, most of the LNG receiving stations adopt the boil-off gas recondensation process to save operating costs. In the technological process of receiving, storing and exporting liquefied natural gas, the recondenser is undoubtedly the core equipment, and the most important condition for the stable operation of the recondenser is that the liquid inlet and inlet speed meet the requirements to ensure its liquid level Stable, so the operator is often required to carry out precise and labor-intensive manual liquid-gas balance control. If the operation is not timely or the emergency treatment experience is insufficient, it is likely to cause process shutdown and equipment damage risks, causing large economic losses to th...

AI Technical Summary

Problems solved by technology

In the technological process of receiving, storing and exporting liquefied natural gas, the recondenser is undoubtedly the core equipment, and the most important condition for the stable operation of the recondenser is that the liquid inlet and inlet speed meet the requirements to ensure its liquid level Stable, so the operator is often required to perform precise and labor-intensive manual liquid-gas balance control. If the operation is not timely or the emergency treatment experience is insufficient, it is very likely to cause process shutdown and equipment damage risks, causing greater economic losses to the receiving station