Temperature and pressure regulation system for heating natural gas in ultra-low temperature environment based on recovery of incoming pressure energy

Abstract

A natural gas temperature and pressure regulation system for heat extraction in an ultra-low temperature environment based on the recovery of incoming pressure energy, which belongs to the field of natural gas, including pipeline natural gas, compressed natural gas, and liquefied natural gas. The invention belongs to the field of natural gas, including pipeline natural gas, compressed natural gas, and liquefied natural gas. The system uses a pressure-driven heating unit composed of a vortex tube, an air-temperature heat exchanger and an ejector to replace the existing heater (for LNG, a low-temperature liquid booster pump is installed between the storage tank and the air-temperature vaporizer , to increase the NG pressure at the outlet of the air-temperature vaporizer). Two pressure-driven devices, the ejector and the vortex tube, are used to pass the low-temperature NG at the outlet of the cold end of the vortex tube into the air-temperature heat exchanger to continuously absorb heat from the environment; at the same time, the temperature of the gas coming out of the hot end of the vortex tube is directly raised to The temperature requirements of the pipe network are met, thereby achieving the goal of eliminating the need for heaters to consume energy.

Description

technical field [0001] The invention belongs to the field of natural gas, including pipeline natural gas, compressed natural gas, and liquefied natural gas, and can recover the residual pressure energy of incoming flow to realize the system for obtaining heat compensation pressure adjustment in ultra-low temperature environment, and temperature adjustment heat demand. technical background [0002] Natural gas is a high-calorie, clean energy. With the increasingly serious problem of environmental pollution and the discovery and development of a large number of gas fields, the proportion of natural gas in the global energy market is increasing. Natural gas can be transported in a variety of ways, such as liquefied natural gas (LNG), canned compressed natural gas (CGN) and pipeline compressed natural gas (PNG), etc. The core is to increase the density (liquid or high-pressure gas) to improve transmission efficiency . [0003] Pipeline natural gas refers to the pipeline that tr...

AI Technical Summary

Problems solved by technology

According to different heat sources, heaters can be divided into combustion heating type, hot water heating type and electric heating type, etc. The existing natural gas gasification heating process needs to consume a lot of energy to heat low-temperature NG

[0007] To sum up, although the air-heated vaporizer is used to absorb the heat of the atmosphere in the gasification process of LNG in the existing process, it is still limited by the atmospheric temperature and cannot achieve effective heat absorption under the condition of lower ambient temperature; and The voltage regulation process of CGN / PNG at all levels uses electric heating more

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