Method and system for efficiently utilizing methane-rich gas

Abstract

The invention provides a method and a system for efficiently utilizing methane-rich gas. According to the method, the main component methane CH4 in natural gas and associated gas of an oil field is used as a raw material for producing carbon dioxide CO2, the CO2 source problem of a carbon dioxide capture oil displacement and burying and recovery ratio improving technology CCS-EOR is solved nearby, and the CO2 capture difficulty and capture cost in a system are reduced by using a membrane reactor and a flameless combustion technology. The conversion rate of CH4 in methane steam reforming is increased by using the membrane reactor, and the yield of hydrogen H2 is increased. In addition, nitrogen N2 generated during air separation and H2 are subjected to an ammonia synthesis process to synthesize an ammonia gas NH3 product, and the ammonia gas NH3 product can be used as a chemical raw material and can also be liquefied into liquid ammonia for long-distance transportation. The liquid ammonia is used as a chemical carrier during long-distance (more than or equal to 200km) transportation of H2, so that the problem of difficulty in long-distance (more than or equal to 200km) transportation of H2 is solved.

Description

technical field [0001] The invention belongs to the field of energy utilization, and in particular relates to a method and system for efficient utilization of methane-rich gas. Background technique [0002] Carbon dioxide capture, flooding and storage and enhanced oil recovery technology CCS-EOR refers to capturing carbon dioxide from industrial or energy production gas sources, transporting it to suitable oil fields through pipelines, tankers, etc., and injecting it as oil displacement medium technology to enhance oil recovery from underground reservoirs while sequestering carbon dioxide in the ground. Carbon dioxide has a high solubility in crude oil. When it is dissolved in a large amount in crude oil, it can expand the volume of crude oil, reduce the viscosity by 30% to 80%, and reduce the interfacial tension between oil and water. The above changes advantageously increase the oil recovery rate, improve the oil washing efficiency and collect residual oil. Compared with...

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Problems solved by technology

[0006] In view of the lack of carbon dioxide gas sources near the oil and gas fields, it is difficult to popularize carbon dioxide capture, oil displacement, storage and enhanced recovery technology CCS-EOR technology, the present invention adopts methane autothermal steam reforming + flameless combustion to solve the CCS-EOR technology To solve the problem of the source of carbon dioxide, at the same time prepare hydrogen and use ammonia as a chemical carrier to realize the long-distance economic transportation of hydrogen energy

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