Liquefied natural gas storage, gas drive and cold energy utilization device and method

Abstract

The invention provides a liquefied natural gas storage, gas drive and cold energy utilization device and method. The liquefied natural gas storage, gas drive and cold energy utilization device comprises a gasification tank provided with a natural gas inlet and a natural gas outlet, and a liquid-gas storage tank, wherein the natural gas inlet communicates with a natural gas storage device, and the natural gas outlet communicates with oil-gas wells; and the liquid-gas storage tank is provided with a gas-liquid inlet and a gas-liquid outlet, wherein the gas-liquid inlet communicates with the oil-gas wells, the gas-liquid outlet communicates with a temporary storage tank, and the gasification tank is arranged in the liquid-gas storage tank and can exchange heat. According to the embodiment of the invention, the liquefied natural gas naturally absorbs heat energy in the storage and transportation process, so that the liquefied natural gas becomes gas, generates high pressure and is injected underground, and the purpose of storage is achieved; and the released cold energy is used for cooling the gas flowing out of the oil-gas wells, so that the gas is further separated, and the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to the field of liquefied natural gas, in particular to a device and method for storage, gas drive and cold energy utilization of liquefied natural gas. Background technique [0002] The main component of liquefied natural gas (LNG) is methane. The natural gas of this component is cooled at ultra-low temperature (-162°C) to obtain its liquid state. The volume of LNG is about 1 / 600 times the volume of the same gaseous state. It is suitable for tank cars , ships and other appliances for long-distance transportation. However, the biggest problem in LNG utilization is storage. The ground or underground storage is huge and occupies a large area of ​​land. Storage tanks require high heat insulation, large investment, long construction time, and high maintenance and operation costs. Therefore, in LNG storage capacity in many countries is far below actual needs, often causing seasonal gas shortages. [0003] At present, people make more...

AI Technical Summary

Problems solved by technology

In addition, the natural gas returned from the ground needs deep cooling to separate various alkanes and other components. The demand for cold energy is very large. At present, fuel is still consumed and power equipment is used for refrigeration. Therefore, production investment and energy are increased. consume more carbon emissions

Images