Automatic control method and system for liquid level of after-condenser of liquefied natural gas receiving station

By maintaining the bottom pressure stability in the recondenser of the liquefied natural gas receiving station, calculating and setting operating temperature and liquid-gas ratio R value, and automatically controlling the mass flow of LNG, the stability and parking risk problems of automatic liquid level control of the recondenser are solved, and higher operational safety and production efficiency are achieved.

CN119668311AActive Publication Date: 2025-03-21PETROCHINA CO LTD +2
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Patent Information

Application Number
CN202311213898.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-19
Publication Date
2025-03-21
Estimated Expiration
2043-09-19

AI Technical Summary

Technical Problem

The existing automatic liquid level control method for recondenser recondenser at liquefied natural gas receiving stations has high liquid level impacts on upstream and downstream pressure fluctuations, many control parameters and poor stability, resulting in unstable operation and high parking risks.

Method used

By maintaining the bottom pressure of the recondenser, the set operating temperature is calculated, and the required liquid-gas ratio R value is calculated based on the numerical values ​​of multiple parameters, and the required LNG mass flow is calculated to achieve automatic control of the liquid level.

Benefits of technology

Effectively control the stability of the recondenser liquid level, reduce the impact on upstream and downstream pressure fluctuations, improve the stability of operating temperature and the stability of control parameters, and reduce parking risks and operator monitoring intensity.

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Abstract

The invention provides an automatic liquid level control method and system for an after-condenser of a liquefied natural gas receiving station. The automatic liquid level control method for the after-condenser of the liquefied natural gas receiving station comprises the steps that S1, the bottom pressure of the after-condenser is kept stable, and the bottom pressure of the after-condenser is obtained; s2, according to the bottom pressure of the after-condenser, the set operation temperature of the after-condenser is calculated; s3, obtaining a plurality of parameter values and BOG mass flow which influence the liquid-gas ratio R value for controlling the recondenser to operate at the set operation temperature; s4, according to the set operation temperature of the recondenser and the multiple parameter values, the liquid-gas ratio R value required by the set operation temperature of the recondenser is calculated; s5, according to the liquid-gas ratio R value required by the re-condenser at the set operating temperature and the BOG mass flow, the LNG mass flow required by feeding of the re-condenser is calculated; and S6, feeding according to the LNG mass flow rate required by feeding of the re-condenser.
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