A kind of methanation method combining fluidized bed and fixed bed

Abstract

The invention discloses a fluidized bed and fixed bed combined methanation method. The method comprises the steps that (1) a methanation feed gas is divided into two feed gases; one feed gas, water vapor and a recycle process gas from a fluidized bed methanation system enter the fluidized bed methanation system after being mixed to undergo methanation reaction under the action of a fluidized bed methanation catalyst; (2) a part of the outlet gas of the fluidized bed methanation system undergoes heat exchange, then is treated by a gas-liquid separator to separate condensed water and is mixed with the other feed gas; the gases enter a fixed bed methanation reaction system to undergo methanation reaction under the action of a fixed bed methanation catalyst; the other part of the outlet gas from the fluidized bed methanation system serves as the recycle process gas. Control of the temperature of the whole system is achieved by adding two system temperature control means, namely regulating the split ratio of the feed gases entering the two reactor systems and injecting the gas mixture of water vapor and the recycle process gas into the fluidized bed reaction system by an ejector.

Description

technical field [0001] The invention relates to a methanation method combining a fluidized bed and a fixed bed, and belongs to the field of methanation. Background technique [0002] Coal is the main source of fossil energy in my country, and the reserves of coal are extremely rich. The proven reserves are as high as 1.28 trillion tons. Oil and natural gas resources are relatively scarce, and the domestic oil and gas production is far from meeting the needs of the rapid development of the national economy. We must rely on a large amount of imports to support the development of our country's economy. my country's import of crude oil has increased from 70 million tons in 2000 to 250 million tons in 2011, and its dependence on foreign oil imports reached 55.2% in 2012. In 2009, my country's natural gas production was 830×10 8 N m 3 , an increase of 7.7% compared with 2008. The apparent consumption is 874.5×10 8 N m 3 , an increase of 11.5% year-on-year. Compared with dom...

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Problems solved by technology

There is no patent for combining a fluidized bed methanation reactor with a fixed bed methanation reactor

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