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Process for preparing synthesis gas from coke-oven gas

A technology for synthesizing natural gas and coke oven gas, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of waste of resources, large equipment investment, emissions, etc., and achieve the effect of improving recovery rate, reducing equipment cost, and small equipment investment

Active Publication Date: 2013-10-30
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2010, my country's coke output was 388 million tons, and the surplus coke oven gas produced was about 77.6 billion Nm 3 , except that part is used for power generation and chemical production, most of the coke oven gas is not effectively utilized, but is directly discharged into the atmosphere, causing serious environmental pollution and waste of resources
[0005] The methane recovery rate obtained by these methods is low, and the equipment investment is relatively large

Method used

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  • Process for preparing synthesis gas from coke-oven gas

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Embodiment 1

[0028] In this embodiment, the process of preparing synthetic natural gas by using coke oven gas is as follows, and the schematic flow chart is as follows figure 1 Shown:

[0029] The dry basis flow rate of coke oven gas is 20000Nm 3 / h, first purify and compress the coke oven gas, the total sulfur in the compressed coke oven gas is less than 0.1ppm, the pressure is 1MPa, the composition (Vol%) of the compressed coke oven gas is: H 2 57.6, CO 8.3, CO 2 2.7, CH 4 25.2,N 2 3.6,C n h m 2, O 2 0.6.

[0030] Then the compressed coke oven gas is divided into three parts: the gas volumes of the first part, the second part and the third part are respectively: 4700Nm 3 / h, 9783Nm 3 / h and 5517Nm 3 / h. The first part of coke oven gas and circulating gas (temperature is 100°C, gas volume is 13500Nm 3 / h) for mixing, and then under the action of a catalyst, a methanation reaction is carried out to obtain a gas mainly composed of methane. The first-stage methanation reac...

Embodiment 2

[0037] In this embodiment, the process of preparing synthetic natural gas by using coke oven gas is as follows, and the schematic flow chart is as follows figure 1 Shown:

[0038] The dry basis flow rate of coke oven gas is 20000Nm3 / h, first purify and compress the coke oven gas, the total sulfur in the compressed coke oven gas is less than 0.1ppm, the pressure is 2.3MPa, the composition (Vol%) of the compressed coke oven gas is: H 2 57.6, CO 8.3, CO 2 2.7, CH 4 25.2,N 2 3.6,C n h m 2, O 2 0.6.

[0039] Then the compressed coke oven gas is divided into three parts: the gas volumes of the first part, the second part and the third part are respectively: 3678Nm 3 / h, 9783Nm 3 / h and 6539Nm 3 / h. The first part of coke oven gas and circulating gas (temperature is 160°C, gas volume is 2500Nm 3 / h) for mixing, and then under the action of a catalyst, a methanation reaction is carried out to obtain a gas mainly composed of methane. The first-stage methanation react...

Embodiment 3

[0046] In this embodiment, the process of preparing synthetic natural gas by using coke oven gas is as follows, and the schematic flow chart is as follows figure 1 Shown:

[0047] The dry basis flow rate of coke oven gas is 20000Nm 3 / h, first purify and compress the coke oven gas, the total sulfur in the compressed coke oven gas is less than 0.1ppm, the pressure is 6MPa, the composition (Vol%) of the compressed coke oven gas is: H 2 57.6, CO 8.3, CO 2 2.7, CH 4 25.2,N 2 3.6,C n h m 2, O 2 0.6.

[0048] Then the compressed coke oven gas is divided into three parts: the gas volumes of the first part, the second part and the third part are respectively: 5250Nm 3 / h, 8680Nm 3 / h and 6070Nm 3 / h. The first part of coke oven gas and circulating gas (temperature is 40°C, gas volume is 12500Nm 3 / h) for mixing, and then under the action of a catalyst, a methanation reaction is carried out to obtain a gas mainly composed of methane. The first-stage methanation react...

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Abstract

The invention discloses a process for preparing synthesis gas from coke-oven gas, which aims to solve the problems of lower methane recovery rate and larger equipment investment in the prior art. The process comprises the following steps of: firstly, the coke-oven gas is compressed and purified, and then is divided into three parts, wherein the first part of coke-oven gas is subjected to first-stage methanation reaction after being mixed with recycle gas to obtain a gas I; the second part of coke-oven gas enters into a separation device to be separated, and methane-rich gas obtained through the separation is taken as a gas II; the third part of coke-oven gas is subjected to second-stage methanation reaction with the gas I and the gas II, part of the gas obtained after the reaction enters into a cyclic compressor to be compressed, and the other part of the gas obtained after the reaction is subjected to third-stage methanation reaction; and a mixed gas mainly containing methane is obtained through the third-stage methanation reaction, and the mixed gas is cooled and dehydrated to obtain synthetic natural gas. The process has small separation gas quantity, high methane recovery rate and small equipment investment and can be used for effectively reducing equipment cost.

Description

technical field [0001] The invention relates to the field of natural gas preparation, in particular to a process for preparing synthetic natural gas from coke oven gas. Background technique [0002] my country is the world's largest coke producer, with a total production capacity of more than 400 million tons. Every ton of coke produced will produce about 400Nm 3 Coke oven gas, about half of which is used for coke oven heating. In 2010, my country's coke output was 388 million tons, and the surplus coke oven gas produced was about 77.6 billion Nm 3 , except that part is used for power generation and chemical production, most of the coke oven gas is not effectively utilized, but is directly discharged into the atmosphere, causing serious environmental pollution and waste of resources. [0003] As a high-quality clean energy, the proportion of natural gas in my country's energy consumption is increasing year by year. Over the years, the production of natural gas is far fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 张新波杨宽辉李泽军何洋郭雄
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND