Fluidized bed and fixed bed combined methanation method

A methanation and fluidized bed technology applied in the field of methanation to achieve the effects of simplifying process flow and control, prolonging catalyst life and reducing instantaneous impact

Active Publication Date: 2016-01-20
CHINA NAT OFFSHORE OIL CORP +1
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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

Method used

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  • Fluidized bed and fixed bed combined methanation method
  • Fluidized bed and fixed bed combined methanation method

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Embodiment Construction

[0033] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0034] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0035] according to figure 1 The process scheme shown carries out the methanation of the feed gas.

[0036] The pressure is 3.5MPa, 100000Nm 3 / h of synthesis gas (for coal-based natural gas) and the total sulfur in the synthesis gas is less than 0.1ppm, f=(n H2 -n CO2 ) / (n CO +n CO2)=3.005 (n represents mole), and the composition (volume fraction, wet base) of concrete synthesis gas is: H 2 : 64.00, CH 4 : 14.30, CO: 20.10, CO 2 : 0.90, N 2 : 0.50, H 2 O: 0.30.

[0037] According to the volume ratio of 0.85 and 0.15, the above raw material gas is divided into two streams and enters the fluidized bed reaction system and the fixed bed reaction system respectively, wherein there are 2 parallel fluidized bed methanation ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 宋鹏飞侯建国姚辉超王秀林张瑜高振穆祥宇张勃李颖侯海龙
Owner CHINA NAT OFFSHORE OIL CORP
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