Method for utilizing low-concentration gas

Abstract

The invention discloses a method for utilizing low-concentration gas. The method comprises the steps that a gas pump house is utilized to provide gas with the methane concentration being lower than 30mole%; a low-concentration gas delivery guarantee unit is utilized to supply one part of the gas provided by the gas pump house to a mixing and blending device to be mixed with air; mixed gas is supplied to a gas heat-storage oxidation device for oxidation treatment, and high-temperature flue gas and oxidized tail gas are obtained; one part of the high-temperature flue gas is supplied to a refrigeration unit to prepare low-temperature water and refrigeration tail gas; the other part of the high-temperature flue gas is supplied to a heating unit to be subjected to heat exchange with cold water,and high-temperature steam and heat-exchanging tail gas are obtained; and the low-concentration gas delivery guarantee unit is utilized to supply the other part of the gas provided by the gas pump house to a gas generating set for burning power-generation, and burnt flue gas is generated. According to the method, on the one hand, the problems of environment polluting of coal burning and gas shortage of natural gas and high-concentration gas are solved, on the other hand, the low-concentration gas is efficiently utilized, and waste of the low-concentration gas is avoided.

Description

technical field [0001] The invention belongs to the technical field of gas utilization, and in particular relates to a method for utilizing low-concentration gas. Background technique [0002] At present, the combined cooling, heating and electricity supply scheme based on natural gas is the main distributed energy solution for office buildings, hospitals, hotels, shopping malls and other buildings. The triple supply scheme has a price advantage over pure electricity in areas rich in natural gas. [0003] The main technical approach of the combined cooling, heating and electricity supply scheme using natural gas as energy is as follows: natural gas enters the gas engine, the gas engine is connected to the generator to generate electric energy, and supplies power to the outside; the high-temperature flue gas of the gas engine is divided into two parts, and one part enters the steam boiler High-temperature steam is generated, which is used for heating in winter; part of it ent...

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose a method for utilizing low-concentration gas, which can use low-concentration gas to replace coal, natural gas and high-concentration gas, and realize combined supply of cold, heat and electricity. Environmental pollution and shortage of natural gas and high-concentration gas. On the other hand, realize efficient utilization of low-concentration gas and avoid waste of low-concentration gas

Images