LNG gasification heating control system and control method

By adjusting the parameters of the circulating water pump and liquid supply valve in real time, the problem of unstable gas supply temperature and pressure of the LNG gasifier is solved, ensuring that the engine receives a constant concentration of fuel gas, thereby achieving stable operation of the engine.

CN115523061BActive Publication Date: 2025-03-28GUANGZHOU DESIGN & RES INST OF SHIPS & MARINE ENG
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Patent Information

Application Number
CN202211161499.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-22
Publication Date
2025-03-28
Estimated Expiration
2042-09-22

AI Technical Summary

Technical Problem

On ships, the supply temperature and pressure of the LNG gasifier cannot be stable, resulting in the engine's fuel gas concentration not constant, affecting the stable operation and speed regulation of the engine.

Method used

The circulating water pump frequency conversion control box and liquid supply valve controller are used to receive the air supply temperature and pressure values ​​in real time, adjust the speed of the circulating water pump and the opening of the liquid supply valve, and ensure the dynamic stability of the heat exchange between the circulating water and LNG and the LNG liquid supply.

Benefits of technology

By dynamically adjusting the flow rate of circulating water and LNG, keeping the supply gas temperature and pressure stable, avoiding changes in fuel gas concentration, and ensuring stable operation of the engine.

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Abstract

The present invention discloses an LNG gasification heating control system and control method, including: a circulating water pump frequency conversion control box, which is used to receive the gas supply temperature value in real time during the operation of the engine, and adjust the speed of the circulating water pump in real time according to the gas supply temperature value, so as to adjust the flow of circulating water flowing from the expansion water tank into the LNG gasifier through the circulating water pump; a liquid supply valve controller, which is used to receive the gas supply pressure value in real time during the operation of the engine, and adjust the opening of the liquid supply valve in real time according to the gas supply pressure value, so as to adjust the flow of the LNG to be processed flowing into the LNG gasifier through the liquid supply valve; the LNG gasifier is used to control the heat exchange between the circulating water and the LNG to be processed to obtain the corresponding fuel gas. The present invention adjusts the circulating water pump speed and the liquid supply valve opening in real time according to the gas supply temperature value and gas supply pressure value obtained in real time, so as to avoid changes in the concentration of the fuel gas delivered to the running engine.
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