System and method for preparing coal-based synthetic natural gas by using abandoned wind electricity or photo-electricity and industrial organic wastewater

Abstract

The invention discloses a system and method for preparing coal-based synthetic natural gas by using abandoned wind electricity or photo-electricity and industrial organic wastewater. The method comprises the following steps: by adopting large-scale abandoned wind electricity or abandoned photo-electricity as a working power supply of water electrolysis equipment, degrading or decomposing organic matters in industrial organic wastewater by virtue of an electrolysis mode, and respectively obtaining a large amount of by-products namely oxygen and hydrogen at two ends of an electrode, wherein oxygen is used as raw gas in a coal gasification process, hydrogen is directly used for reducing a large amount of carbon dioxide generated in coal gasification and adjusting the hydrogen-to-carbon ratio of refined gas in a mixer, and natural gas is prepared by virtue of methanation reaction. According to the system and method disclosed by the invention, a novel coal-based synthetic natural gas process is optimized and upgraded; and by virtue of combination and complementation of new and old energy industries, the yield of the coal chemical industry can be improved, the emission of carbon dioxide and energy consumption in a production process can be reduced, and the energy conservation, environmental protection and high benefits of a coal-based synthetic natural gas process can be achieved.

Description

technical field [0001] The invention relates to a method for collecting and utilizing renewable energy, in particular to a system and a method for using wind power, photovoltaic waste electricity and industrial organic waste water for coal-to-natural gas. Background technique [0002] my country's economy has maintained a steady and rapid growth momentum in recent years. Industry, agriculture, tertiary service industries and high-tech industries have developed rapidly, and people's living standards have continued to improve. At the same time, the demand for and use of traditional energy has also increased significantly. At present, my country is already the second largest oil consumer in the world, and its dependence on oil imports is also increasing year by year. my country is also a major contributor to coal production and consumption, with the total amount close to 1 / 2 of the world's total. This is also one of the main reasons for domestic environmental problems, especial...

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Problems solved by technology

However, there are obvious disadvantages in adjusting the ratio of hydrogen to carbon in this way: (1) According to the chemical reaction equation (2), the conversion reaction (sulfur tolerance wide temperature conversion) must consume a large amount of water and produce a large amount of greenhouse gases Carbon dioxide; (2) In order to generate more hydrogen, more carbon monoxide needs to be consumed, which reduces the effective conversion rate of carbon and affects the final methane yield; (3) The shift reaction requires at least 5MPa pressure and 300°C It can only be carried out well under high temperature and high pressure conditions of ~600°C, which consumes a lot of energy and is difficult to control

Hydrogen-oxygen production by electrolysis of water is already a very mature technology in the industry, which can provide oxygen and hydrogen. However, due to its high energy consumption, it has not been applied on a large scale in the industry.

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