Method and device for preparing synthesized gas through CO2/H2O electrolysis assisted by low-concentration coal-bed gas

Abstract

The invention discloses a method and device system for preparing synthesized gas through CO2 / H2O electrolysis assisted by low-concentration coal-bed gas. On the basis of preparing the synthesized gas through original high-temperature co-electrolysis of an SOEC (Solid Oxide Electrolysis Cell), two reactions of oxidization of the coal-bed gas part and catalytic combustion of exhaust gas are coupled to assist the high-temperature co-electrolysis process of the SOEC, thus realizing treatment wastes through wastes. Compared with an originally conventional mode of feeding air into an anode, the method has the advantages that the coal-bed gas, which replaces the air, is fed into the anode, so that the working voltage can be effectively reduced; a galvanic pile even can realize spontaneous operation; in case of assistance of certain external voltage, efficient operation of a process can be realized, and the power consumption level of the galvanic pile is greatly decreased. Meanwhile, a low-quality product obtained by oxidizing part of the coal-bed gas passing through the galvanic pile can preheat raw material gas through catalytic oxidization, so that the energy consumption level of the original process is further decreased, and low-energy-consumption operation of the whole process is realized.

Description

technical field [0001] The invention belongs to the technical field of energy utilization, and relates to a method of using low-concentration coal bed gas to assist the electrolysis of CO 2 / H 2 O Preparation of synthesis gas method and device system, especially related to a solid oxide electrolytic cell (SOEC), thereby realizing low-concentration coal bed gas-assisted electrolysis of CO 2 / H 2 O Preparation of synthesis gas method and device system. Background technique [0002] Energy and the environment are currently the focus of attention of all countries in the world. The climate change characterized by global warming is mainly caused by the high emission of greenhouse gases such as carbon dioxide caused by the excessive use of fossil fuels by human beings. [0003] Solid oxide cell (Solid Oxide Cell, SOC) is an electrochemical device composed of ceramic oxide materials, which realizes efficient conversion and reversible storage between fuel chemical energy and elec...

AI Technical Summary

Problems solved by technology

Syngas is the basic raw material for the preparation of synthetic hydrocarbon fuels, and its production is mainly realized through coal gasification and natural gas reforming, both of which consume fossil energy and eventually lead to the greenhouse gas CO 2 A large amount of emissions, and the production process is complicated, the investment in equipment is large, and the reaction conditions are relatively high

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