Process and device for integrally producing substitute natural gas by coal gasification and methanation

Abstract

The invention relates to a process and a device for integrally producing substitute natural gas by coal gasification and methanation, which comprises the following steps: manufacturing the raw material coal into pulverized coal or coal water slurry; feeding the raw materials into a gasification furnace for partial oxidation reaction to generate a gas mixture; and enabling the gas mixture to enter a subsequent device for processing to obtain the substitute natural gas, wherein the gasification furnace and / or the subsequent device are subject to methanation catalysis and strengthen process, and the gas mixture generates a methanation reaction in the gasification furnace and / or the subsequent device. The devices comprise the following equipments: the gasification furnace, a dust filter, a gas chiller and / or a coal gas heat exchanger, wherein one or more of the devices are subject to the methanation catalysis and the strengthen process. The process and the device for integrally producing the substitute natural gas through the coal gasification and methanation provided by the invention has high cost efficiency and competitiveness.

Description

technical field [0001] The invention relates to a production process and device for a substitute natural gas, in particular to a process and a device for integrated production of a substitute natural gas by coal gasification and methanation. Background technique [0002] In 2009, China's natural gas accounted for less than 5% of primary energy consumption, while developed countries had reached about 25%. China is a country rich in coal but short of oil and gas. The use of coal gasification and methanation to produce substitute natural gas has great market potential. Many large energy companies have set foot in the field of coal-based natural gas. [0003] Coal-to-natural gas technology traditionally uses coal gasification to generate CO and H 2 of syngas, which is then desulfurized and deCO 2 After that, CO and H 2 The methanation reaction, the CO and H 2 Convert to CH 4 and H 2 O, so as to realize the production of substitute natural gas. Both the Great Plains Corpor...

AI Technical Summary

Problems solved by technology

The synthesis gas is used for methanation to produce substitute natural gas. Since coal gasification and methanation are separated, and methanation needs to be carried out in multiple stages, a large amount of reaction gas needs to be circulated, the equipment investment is large, the power consumption of the compressor is high, and the operating cost is much higher than that of Lugi Gasification technology, so the above-mentioned coal gasification technology is difficult to apply to coal-based natural gas production

[0008] To sum up, the Lurgi coal fixed-bed gasification technology, which is suitable for coal-to-substituting natural gas, is subject to various restrictions due to the difficulty in treating wastewater pollution and the high requirements of the fixed-bed technology itself on coal quality, while the widely popular Texaco water coal Slurry coal gasification technology, Shell pulverized coal gasification technology and similar and improved technologies, because the current methanation technology needs to be carried out in multiple stages and a large amount of circulating reaction gas, so the operating cost is too high and not economical

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