Purging device and method for LNG (Liquefied Natural Gas) pipeline

• Main Authors: HU YUNYUE, BIAN YUAN, HE HONGRU, WANG GANG, LIN SUHUI, XU LEIHONG, MO SHAOBING, ZOU BIN, PI LIU, WU YUCHENG
• Format: Patent
• Language: Chinese; English
• Published: 21.06.2024
• Subjects: CLEANING; CLEANING IN GENERAL; PERFORMING OPERATIONS; PREVENTION OF FOULING IN GENERAL; TRANSPORTING

The invention provides a purging device and method for an LNG (liquefied natural gas) pipeline, and the device comprises a purging pipeline connected between an isolation valve and a blind plate in a high-pressure pump inlet pipeline, and a drain valve, a pressure detection assembly, a nitrogen injection assembly, an emptying valve and a gasifier which are sequentially connected to a main pipeline of the purging pipeline, and a first regulating valve connected with a BOG (boil-off gas) pipeline, the purging pipeline further comprises a bypass pipeline connected with the main pipeline in parallel, and a second adjusting valve is arranged on the bypass pipeline. In the implementation mode, when the gas pressure of the main pipeline exceeds the first preset threshold value, the main pipeline enters a discharging state, and the first adjusting valve is opened; if the gas pressure of the main pipeline is lower than a second preset threshold value, entering a pressure adjusting state, opening a second adjusting val