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Methanation reaction process using oven gas to prepare substitute natural gas

A technology for synthesizing natural gas and methanation reactors, which is applied in the petroleum industry, gas fuels, fuels, etc., can solve problems such as unfavorable methanation reactions, and achieve the effects of reducing energy consumption, reducing product gas volume, and reducing costs

Active Publication Date: 2009-08-19
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO+CO in coke oven gas by dilution method 2 The concentration is diluted to 1 / 3 with the mixed gas that has been methanized, that is, the circulation ratio is 2 (the circulation ratio refers to the ratio of the amount of methanated gas used for dilution to the amount of coke oven gas), and the two-stage conversion is adopted due to the import CO, CO 2 The concentration is high, and the outlet temperature of the first stage is as high as 600°C, which is still unfavorable to the methanation reaction

Method used

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  • Methanation reaction process using oven gas to prepare substitute natural gas
  • Methanation reaction process using oven gas to prepare substitute natural gas
  • Methanation reaction process using oven gas to prepare substitute natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, the methanation process for producing synthetic natural gas from coke oven gas is as follows: figure 1 Shown:

[0036] First, the coke oven gas is purified to remove benzene and naphthalene, hydrogenate, and remove oxygen and desulfurization. The composition of the purified coke oven gas (vol%, dry basis, the same below) is H 2 57.6, CH 4 26.9, CO 7.2, CO 2 2.1,N 2 4.1, CnHm 2.1. The purified raw gas volume is 1000kmol / h (22400Nm 3 / h), as the raw coke oven gas for the following methanation reaction.

[0037] then follow figure 1 As shown in the process flow, a 2-stage methanation reaction is carried out using a 2-stage methanation reactor:

[0038] The raw coke oven gas is divided into two parts (400kmol and 600kmol respectively) and enters the first-stage and second-stage methanation reactors respectively:

[0039] 400kmol of raw coke oven gas 0 enters pipeline 1 at a temperature of 120°C and a pressure of 1.25MPa, and is mixed with 800km...

Embodiment 2

[0044] In this example, the methanation process for producing synthetic natural gas from coke oven gas is as follows: figure 2 Shown:

[0045] First, the coke oven gas is purified to remove benzene and naphthalene, hydrogenate, and remove oxygen and desulfurization. The composition (vol%) of the purified coke oven gas is: H 2 57.6, CH 4 26.9, CO 7.2, CO 2 2.1,N 2 4.1, CnHm 2.1. The purified raw gas volume is 1000kmol / h (22400Nm 3 / h), as the raw coke oven gas for the following methanation reaction.

[0046] then follow figure 2 As shown in the process flow, a 3-stage methanation reaction is carried out using a 3-stage methanation reactor:

[0047] The raw material coke oven gas is divided into three parts (respectively 250kmol, 350kmol and 400kmol) into the first-stage, second-stage and third-stage methanation reactors respectively:

[0048] The first part of 250kmol raw coke oven gas 0 enters pipeline 1 at a temperature of 120°C and a pressure of 1.25MPa, and i...

Embodiment 3

[0054] In this example, the methanation process for producing synthetic natural gas from coke oven gas is as follows: image 3 Shown:

[0055] First, the coke oven gas is purified to remove benzene and naphthalene, hydrogenate, and remove oxygen and desulfurization. The composition (vol%) of the purified coke oven gas is: H 2 57.6, CH 4 26.9, CO 7.2, CO 2 2.1,N 2 4.1, CnHm 2.1. The purified raw gas volume is 1000kmol / h (22400Nm 3 / h), as the raw coke oven gas for the following methanation reaction.

[0056] then follow image 3 As shown in the process flow, a 4-stage methanation reaction is carried out using a 4-stage methanation reactor:

[0057] Raw coke oven gas is divided into four parts (respectively 150kmol, 200kmol, 300kmol and 350kmol) into the first-stage, second-stage, third-stage and fourth-stage methanation reactors:

[0058] The first part of 150kmol raw coke oven gas 0 enters pipeline 1 at a temperature of 120°C and a pressure of 1.25MPa, and is mixe...

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Abstract

The invention discloses a methanation reaction technique using oven gas for preparing synthetic natural gas. A multilevel methanation reactor is adopted to control the temperature of gas at the inlet of every level of methanation reactor and the total content of CO+CO2 in the gas at the inlet to be less than or equal to 3.5%, so as to ensure the temperature of gas at the outlet of every level of methanation reactor to be less than or equal to 450 DEG C after methanation. By adopting the technique, the quantity of the gas used for diluting CO+CO2 in the oven gas of the raw materials can be greatly reduced, and the energy consumption is remarkably lowered; meanwhile, the gas temperature at the outlet of the methanation reactor can be effectively controlled, thus being beneficial to methanation reaction and the selection of the materials of the reactor.

Description

technical field [0001] The invention relates to the technical field of preparing synthetic natural gas by utilizing coke oven gas, in particular to a methanation reaction process for preparing synthetic natural gas by utilizing coke oven gas. Background technique [0002] my country is a big country of coke production, with an annual production capacity of more than 300 million tons, and coke oven gas produced by each ton of coke is about 400m 3 . In addition to self-use, domestic and commercial fuels, more than 20 billion m of gas is released every year 3 . [0003] The composition of coke oven gas is relatively complex, among which CH 4 , CO, CO 2 , CnHm volume fraction nearly 40%, and high hydrogen content (volume fraction 54%-59%, the same below), through the methanation reaction, namely: [0004] CO+3H 2 =CH 4 +H 2 o [0005] and CO 2 +4H 2 =CH 4 +2H 2 o [0006] Can convert most of CO, CO 2 converted to methane, so that the coke oven gas becomes mainly C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 陶鹏万古共伟周耀冉崇慧杨宽辉卿涛
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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