Method of using methanol, carbon dioxide and water to prepare high-quality synthetic gas

Abstract

The invention provides a method of using methanol, carbon dioxide and water to prepare high-quality synthetic gas. The water generates oxygen and hydrogen in a water electrolytic cell at the same time; all or part of oxygen is mixed with methanol and carbon dioxide, and a mixture flows into a plasma catalytic reforming reactor to generate reforming product gas; the reforming product gas is mixed with hydrogen generated by a cathode of the water electrolytic cell to obtain the high-quality synthetic gas; methanol, carbon dioxide and the water are used as raw materials, so that the raw materialsare rich in resource and renewable, and emission reduction of CO2 is facilitated. The generated synthetic gas is high in concentration, meets a requirement that a molar ratio of methanol synthesis and Fischer-Tropsch synthesis (H2-CO2) / (CO+CO2) is equal to 2, and can be directly applied in methanol synthesis and Fischer-Tropsch synthesis without aftertreatment. Through plasma catalytic reformingand electrolytic water reaction coupling, electric energy is converted into chemical energy through a synthetic gas route, and a reaction system has the advantages of high energy efficiency, quick response and flexibility in regulation and is especially suitable for large-scale storage of regenerated electric energy.

Description

technical field [0001] The invention relates to a method for preparing synthesis gas, in particular to a method for preparing high-quality synthesis gas from methane, carbon dioxide and water. Background technique [0002] Syngas is a raw material gas used in the synthesis of liquid fuels and chemicals, with carbon monoxide and hydrogen as the main components. Among them, the syngas requirement (H 2 -CO 2 ) / (CO+CO 2 ) molar ratio is equal to 2 (no CO 2 , which simplifies to H 2 / CO molar ratio is equal to 2). [0003] Since methane has the highest H / C atomic ratio and is extremely abundant in natural and renewable resources, such as natural gas, shale gas, combustible ice, and biogas, it is an important raw material for industrial synthesis gas production. There are three basic reforming methods for producing synthesis gas from methane: steam reforming, CO 2 Reforming (dry reforming) and oxidative reforming (partial oxidation). The first two, steam reforming and CO ...

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Problems solved by technology

This will inevitably lead to a large amount of CO in the double whole product gas 2 and H 2 O, so the syngas concentration is very low, and (H 2 -CO 2 ) / (CO+CO 2 ) molar ratio does not meet the requirements

[0006] On the other hand, renewable energy such as wind power and photovoltaic power generation is inherently intermittent and unstable, and electric energy cannot be stored directly. Therefore, how to realize large-scale storage of renewable electric energy is a bottleneck problem restricting its application and development.

Water electrolysis is a mature technology for hydrogen production. Although renewable electricity can be converted into hydrogen energy on a large scale with high efficiency, it is hindered by the safety issues of hydrogen storage and transportation.

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