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Method for preparing synthetic natural gas by coke oven gas in combination with straw gas

A technology for synthesizing natural gas and coke oven gas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems that the economic benefits cannot be increased to the maximum, and achieve the effects of facilitating industrial application and promotion, reducing investment, and improving economic benefits

Inactive Publication Date: 2012-07-18
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More than 90% of the electricity consumption in the entire methanation reaction process is used on the gas compressor, and the supplemented 1 volume of CO 2 with 4 volumes H 2 The reaction produces 1 volume of CH 4 and 2 volumes H 2 O, so whether the gas after the methanation reaction is returned to the first-stage methanation reaction for recycling, or the CO 2 Supplement to feed gas to neutralize excess H 2 Responses are unable to maximize economic benefits

Method used

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  • Method for preparing synthetic natural gas by coke oven gas in combination with straw gas
  • Method for preparing synthetic natural gas by coke oven gas in combination with straw gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Adjust the raw material gas composition: coke oven gas composition (mol%) is: H 2 56.5, CH 4 25.6, CO 7.6, CO 2 2.3, N 2 5.4、C n h m 2.2, O 2 0.4, total sulfur 380mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 , gas volume 535.7kmol / h;

[0035] The composition of straw gas (mol%) is: H 2 48.2 CH 4 3.9, CO 23.6, CO 2 22.7, N 2 0.7, C n h m 0.6, O 2 0.3, total sulfur 180mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 ,gas volume 750kmol / h;

[0036] After mixing in the gas cabinet, the composition of the mixed gas (mol%) is: H 2 51.8, CH 4 12.9, CO 17.0, CO 2 14.1, N 2 2.6, C m h n 1.3, O 2 0.3, total sulfur 261mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 ;

[0037] (2) Compression purification: Pressurize the gas mixed in step (1) to 2.0Mpa through a compressor, pass through an adsorption bed equipped with activated carbon through temperature-swing adsorption, and then remove the raw material g...

Embodiment 2

[0046] (1) Adjust the raw material gas composition: coke oven gas composition (mol%) is: H 2 56.5, CH 4 25.6, CO 7.6, CO 2 2.3, N 2 5.4、C m h n 2.2, O 2 0.4, organic sulfur 380mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 , gas volume 446.5kmol / h;

[0047] The composition of straw gas (mol%) is: H 2 50.0, CH 4 3.6, CO 24.1, CO2 20.7, N 2 0.6, C m h n 0.7, O 2 0.3, organic sulfur 184mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 ,gas volume 750kmol / h;

[0048] After mixing in the gas cabinet, the composition of the mixed gas (mol%) is: H 2 52.6, CH 4 11.8, CO 17.7, CO 2 13.9, N 2 2.4, C m h n 1.3, O 2 0.3, total sulfur 263mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 ;

[0049] (2) Compression purification: pressurize the gas mixed in step (1) to 1.6Mpa through a compressor, and then remove benzene, naphthalene, tar and organic sulfur in the raw material gas after passing through the adsorption bed layer...

Embodiment 3

[0057] (1) Adjust the raw material gas composition: coke oven gas composition (mol%) is: H 2 54.2, CH 4 26.2, CO 6.3, CO 2 2.7, N 2 4.1, C m h n 3.0, O 2 0.4, total sulfur 376mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 , gas volume 446.5kmol / h;

[0058] The composition of straw gas (mol%) is: H 2 50.0, CH 4 3.6, CO 24.1, CO 2 20.7, N 2 0.6, C m h n 0.7, O 2 0.3, total sulfur 184mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 , gas volume 669.6kmol / h;

[0059] After mixing in the gas cabinet, the composition of the mixed gas (mol%) is: H 2 52.5, CH 4 12.8, CO 17.2, CO 2 13.6, N 2 2.0, C m h n 1.6, O 2 0.3, total sulfur 264mg / Nm 3 , trace amounts of benzene and naphthalene, tar 3 ;

[0060] (2) Compression purification: pressurize the gas mixed in step (1) to 0.5Mpa through a compressor, and then remove benzene, naphthalene, tar and organic sulfur in the raw material gas after passing through the adsorption bed lay...

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Abstract

The invention discloses a method for preparing a synthetic natural gas by a coke oven gas in combination with a straw gas. The method comprises the following seven steps of: regulation of feed gas components, compression purification, pre-heating treatment and adding of water vapor, primary section of methanation reaction, secondary section of methanation reaction, gas-liquid separation, and pressure swing adsorption for purifying methanol to finally obtain the synthetic natural gas with CH4 concentration being more than 90%. According to the method for preparing the synthetic natural gas by the coke oven gas in combination with the straw gas, the coke oven gas and biomass renewable energy source straw gas are comprehensively used according to the characteristics of much hydrogen and less carbon in the coke oven gas and less hydrogen and much carbon in the straw gas to prepare the synthetic natural gas, energy exchange is fully utilized, circulating compression is reduced, energy is saved and emission is reduced, the economic benefit is improved, the environmental protection is facilitated, and the renewable biomass energy is developed to replace fossil energy.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of coke oven gas and straw gas, and in particular relates to a method for preparing synthetic natural gas by using coke oven gas combined with straw gas as raw materials. Background technique [0002] Coke oven gas is a by-product of the coke production process. my country is a major coke producer with an annual production capacity of more than 300 million tons. According to 1 ton of coke products, about 400m 3 The by-products of coke oven gas are generated, and the annual coke oven gas produced in my country is about 120 billion m 3 , in addition to the production of coke for self-use, heat generation, power generation, etc., there are about 20 billion m 3 not being properly utilized. In recent years, the use of coke oven gas has become more and more extensive, including hydrogen production, methanol production, deep purification or methanation reaction as city gas, etc. [0...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 钟娅玲曾启明钟雨明陈天洪高利梅
Owner SICHUAN TECHAIRS
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