System and method for producing synthesis gas from carbon dioxide enhanced coal-bed methane

Abstract

The invention discloses a system and a method for producing synthesis gas from carbon dioxide enhanced coal-bed methane. The system comprises a carbon dioxide trapping system, wherein power plant flue gas is connected to a carbon dioxide storage tank by virtue of the carbon dioxide trapping system; the outlet of the carbon dioxide storage tank is divided into two paths, wherein one path is connected to a carbon dioxide pressure-injection system and the other path is connected to a third flow controller; the carbon dioxide pressure-injection system is connected to an extracted gas storage tank sequentially by virtue of an injection well, an extraction well and an extracted gas purifying device; the outlet of the extracted gas storage tank is divided into two paths, wherein one path is connected to a second flow controller and the other path is connected to a first flow controller; the first flow controller and the third flow controller, after being connected, are connected to the reaction channel of a methane catalytic reforming reactor by virtue of a gas composition analysis device; synthesis gas H2 and CO can be generated by the reaction channel; the second flow controller is connected to the heating channel of the methane catalytic reforming reactor; and the heating channel is connected to the carbon dioxide trapping system, so that the efficient utilization of carbon dioxide and coal-bed gas is achieved.

Description

technical field [0001] The invention belongs to the technical field of greenhouse gas emission reduction and coal-bed methane development and utilization, and in particular relates to a system and method for producing synthesis gas by displacing coal-bed methane with carbon dioxide. Background technique [0002] Injecting carbon dioxide into the coal seam can increase the recovery rate of coal bed methane gas. While methane gas is produced, carbon dioxide is stored in the coal seam. This technology is called carbon dioxide displacement coal bed methane recovery technology (CO2 2 -ECBM). The main component of coalbed methane recovered by CO2 flooding is methane CH 4 and carbon dioxide CO 2 , the ratio of the two is closely related to factors such as carbon dioxide injection intensity, coal seam pressure, and coal seam gas content, and there may also be a small amount of oxygen. Generally, in order to obtain methane gas with higher purity, it is necessary to remove and rein...

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Problems solved by technology

The carbon dioxide removal process of coalbed methane increases the energy consumption of the system operation

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