Method of preparing synthetic natural gas by coke oven gas

A technology for synthesizing natural gas and coke oven gas, which can be used in gas fuel, petroleum industry, fuel and other directions, and can solve the problems of low calorific value and high impurity content

Active Publication Date: 2007-02-28
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The calorific value of the product gas obtained by the above method is still low, all lower than 31.40MJ / m 3 ; and high impurity content

Method used

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  • Method of preparing synthetic natural gas by coke oven gas

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Experimental program
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Effect test

Embodiment 1

[0026] In this embodiment, the method for preparing synthetic natural gas by using coke oven gas is as follows, and the flow diagram is shown in Figure 1:

[0027] First, the coke oven gas is purified to remove benzene, naphthalene, heavy hydrocarbons, and sulfides, and the composition (vol%) of the purified coke oven gas is: H 2 58.6, CH 4 26,N 2 4, O 2 0.4, CO 7, CO 2 2,C m h n 2; the purified coke oven gas is treated with SiO 2 Under the action of the Ni catalyst system as the carrier, the methanation reaction is carried out to generate methane, and a mixed gas mainly composed of methane is obtained. The pressure of the methanation reaction is about 1.0MPa, and the temperature at the reactor inlet is about 250°C; part of the mixed gas is returned to To the feed gas before the methanation reaction to dilute CO and CO 2 concentration, the circulation ratio is about 1:1, and the raw material gas composition (vol%) after dilution is: H 2 50.4, CH 4 37.64,N 2 ...

Embodiment 2

[0032] In this embodiment, the method for preparing synthetic natural gas by using coke oven gas is as follows, and the flow diagram is shown in Figure 1:

[0033] First, the coke oven gas is purified to remove benzene, naphthalene, heavy hydrocarbons, and sulfides, and the composition (vol%) of the purified coke oven gas is: H 2 58.6, CH 4 26,N 2 4, O 2 0.4, CO 7, CO 2 2,C m h n 2; the coke oven gas after this purification, in Al 2 o 3 Under the action of the Ni catalyst system as the carrier, the methanation reaction is carried out to generate methane, and a mixed gas mainly composed of methane is obtained. The pressure of the methanation reaction is about 1.0MPa, and the temperature at the reactor inlet is about 250°C; part of the mixed gas is returned to To the feed gas before the methanation reaction to dilute CO and CO 2 concentration, the circulation ratio is about 2:1, and the raw material gas composition (vol%) after dilution is: H 2 48.23, CH 4 40.8...

Embodiment 3

[0038] In this embodiment, the method for preparing synthetic natural gas by using coke oven gas is as follows, and the flow diagram is shown in Figure 1:

[0039] First, the coke oven gas is purified to remove benzene, naphthalene, heavy hydrocarbons, and sulfides, and the composition (vol%) of the purified coke oven gas is: H 2 58.6, CH 4 26,N 2 4, O 2 0.4, CO 7, CO 2 2,C m h n 2; the purified coke oven gas is treated with SiO 2 Under the action of the Ni catalyst system as the carrier, the methanation reaction is carried out to generate methane, and a mixed gas mainly composed of methane is obtained. The pressure of the methanation reaction is about 3.0MPa, and the temperature at the reactor inlet is about 250°C; part of the mixed gas is returned to To the feed gas before the methanation reaction to dilute CO and CO 2 concentration, the circulation ratio is about 2:1, and the raw material gas composition (vol%) after dilution is: H 2 48.23, CH 4 40.82,N 2 ...

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Abstract

The invention discloses the method for producing natural gas with coking gas, comprising the following steps: purifying coking gas and removing benzene, naphthalene, hydrocarbon and sulphide, compressing, heat transferring, carrying out methanation reaction with catalyst, hydrogen in COG reacting with carbonic oxide and carbon dioxide to get methane; putting the mixture gas into pressure swing adsorbing device, and getting natural gas whose concentration is 90%. The natural gas has high caloric value, low impurity content.

Description

technical field [0001] The invention relates to a method for preparing synthetic natural gas by using coke oven gas. Background technique [0002] The annual production capacity of coke in my country is about 300 million tons, and the by-product coke oven gas is 400m3 for every ton of coke produced. 3 Counting around, in addition to coking for personal use, civil and commercial fuels, and power generation, the annual release of gas reaches 20 billion m 3 , not only wasting precious resources, but also polluting the environment. [0003] The composition of coke oven gas (COG) is relatively complex and varies widely, depending on the properties of the coking coal used, coking methods and operating conditions. Its main composition (vol) is as follows: H 2 54-59%, CH 4 23-28%, N 2 3-5%, O 2 0.3-0.7%, CO 5.5-7%, CO 2 1.2-2.5%, C m h n 1.5-3%. Its impurities include sulfide, benzene, naphthalene, and heavy hydrocarbons. It is characterized by high hydrogen content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 陶鹏万王晓东
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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