A plugging experimental system for lng/ng pipeline leakage

Abstract

The invention discloses a leakage blockage experiment system for LNG (liquefied natural gas) / NG (natural gas) pipeline leakage. The system comprises an LNG Dewar flask, an LN2 Dewar flask, a casing pipe type low-temperature heat exchanger, a pressure water tank with a view window, a leakage module, a temperature sensor, a pressure sensor, a water tank with a temperature control device, a variable speed motor, a turbofan and the like. The leakage work medium temperature can be changed through the casing pipe type low-temperature heat exchanger; the leakage pressure is regulated by regulating the self pressurization valve arranged on the Dewar flask and an adjustable pressure back pressure valve arranged behind the leakage module; the leakage time of the LNG / NG is controlled through an electromagnetic valve; through the water tank with the temperature control device and a water pump, the temperature and the flowing speed of the water entering the pressure water tank with the view window are controlled; by changing the rotating speed of the speed regulating motor, the rotating speed of the turbofan is controlled, so that the influence of the eddy current agitation on the leakage blockage can be simulated; the LNG / NG flowing through a leakage pipeline is received through a low-temperature liquid containing tank and a gas storage tank; the generated waste gas is exhausted into the atmosphere through an exhaust pipeline and an exhaust mask; the safety of experiments is ensured.

Description

technical field [0001] The invention relates to a plugging experiment system for leakage of cryogenic liquid pipelines, more specifically, relates to a plugging experiment system for leakage of pipelines in LNG / NG water areas and land areas. Background technique [0002] Natural Gas (NG for short) is the least polluting energy among fossil energy sources, and its calorific value is correspondingly higher than that of coal and petroleum. my country is vigorously increasing the proportion of NG in the energy consumption structure. With the increase of transportation distance, the transportation volume of submarine pipelines and LNG (Liquid Natural Gas) ships is increasing rapidly. When the submarine pipeline ruptures, the LNG ship has a marine transportation accident, or the LNG terminal is loading and unloading, it may cause LNG water / land leakage. Through statistics of past LNG / NG leakage accidents, it is found that the vast majority of leakage accidents are Pipeline leakag...

AI Technical Summary

Problems solved by technology

However, due to the low-temperature characteristics and unsafety of LNG / NG, and considering the diversity of experimental conditions that the experimental platform can provide, special consideration and design of the experimental system is required

At present, there is no research and development of an experimental platform for leakage and plugging of cryogenic liquids / gases caused by pipeline ruptures under water / land conditions.

If the existing research platform is used for leak plugging experiments, the following problems will occur: 1) It is impossible to complete the low-temperature liquid / gas leakage control through the experimental platform; 2) It is impossible to complete the underwater plugging operation through the experimental platform; 3) Platform cannot be used in flammable and explosive test subjects

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