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A multi-functional sulfur-tolerant methanation conversion process suitable for coal-to-gas

A multi-functional and technological technology, applied in the petroleum industry, gas fuels, fuels, etc., can solve the problems of difficult desulfurization and decarbonization process, deactivation of shift catalysts, shallow shift depth, etc., so as to reduce production costs, equipment investment and operating costs. The effect of reduction and production cost reduction

Active Publication Date: 2016-06-15
青岛联信催化材料有限公司 +1
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AI Technical Summary

Problems solved by technology

[0003] Although the coal-to-natural gas technology is basically mature, it has exposed important problems restricting production in industrial applications: (1) Due to the different types of raw coal, the CO content in the raw gas produced by gasification is low, while that of synthetic natural gas Due to the limitation of H2 / CO, the conversion depth is shallow, and the heat released by the reaction is not enough to maintain the self-heating balance of the conversion device. It is necessary to add steam to maintain the operation of the device, resulting in a large waste of energy; (2) Due to the low conversion temperature, it is not conducive to The hydrolysis of organic matter in the raw gas and the formation of tar deposits easily deactivate the shift catalyst
(3) Most of the raw material gas directly enters the low-temperature methanol washing section, causing difficulties for the subsequent desulfurization and decarbonization process

Method used

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  • A multi-functional sulfur-tolerant methanation conversion process suitable for coal-to-gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Two-stage multifunctional sulfur-resistant methanation and transformation process

[0022] The first level of sulfur resistance-methanation: CO dry basis volume content is 20.63% (CH 4 The raw material gas with a volume content of 11.7% is firstly lowered to 150 degrees by heat exchanger, then enters the separator to separate excess water, enters the detoxification tank to remove dust and other impurities, and reacts with the first-stage multifunctional The gas is heat-exchanged to 450°C and enters the first reactor for the first-stage sulfur-resistant methanation, transformation and hydrolysis reactions. The hot spot temperature of the first-stage reactor bed is 580°C, and the reaction pressure is 3.0MPa. The first-stage reactor The dry basis content of CO in the outlet gas is 14.7%; CH 4 The dry basis content is 15.7%.

[0023] The gas after the first-stage reaction exchanges heat with the inlet raw material gas, and is cooled to 450°C by the medium-pressure steam p...

Embodiment 2

[0027] Two-stage multifunctional sulfur-resistant methanation and transformation process

[0028] The first stage of sulfur resistance-methanation: the raw material gas with a CO dry basis content of 22.3% (CH4 content of 8.7%) is first reduced to 150 degrees by a heat exchanger, and then enters a separator to separate excess water, and then enters a degasser. After removing dust and other impurities in the poison tank, the gas after the first-stage multifunctional reaction is exchanged with the gas to 430°C, and enters the first reactor for the first-stage sulfur-resistant methanation, transformation and hydrolysis reactions. The first-stage reactor bed The hot spot temperature is 650°C, the reaction pressure is 3.0MPa, and the dry basis content of CO in the outlet gas of the first stage reactor is 15.1%; the dry basis content of CH4 is 17.2%.

[0029] The gas after the first-stage reaction exchanges heat with the inlet raw material gas, and is cooled to 450°C by the medium-p...

Embodiment 3

[0033] Level 1 multifunctional sulfur-resistant methanation and transformation process

[0034] The first level of sulfur resistance-methanation: CO dry basis content is 14.5% (CH 4 9.4% raw material gas) first heat exchanger to reduce the temperature to 100 degrees, then enter the separator to separate excess water, enter the detoxification tank to remove dust and other impurities, and react with the first stage multifunctional The gas is heat-exchanged to 410°C and enters the first reactor for the first-stage sulfur-resistant methanation, transformation and hydrolysis reactions. The hot spot temperature of the first-stage reactor bed is 580°C, the reaction pressure is 3.2MPa, and the CO in the reactor outlet gas The dry basis content is 9.6%; CH 4 The dry basis content is 15.2%.

[0035] H after 1st order reaction 2 / CO≈3.5, organic sulfur hydrolysis rate 99.2%

[0036] Molybdenum-based multifunctional catalyst is used in the above process, and the volume space velocity ...

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Abstract

The invention provides a multifunctional sulfur-resistant methanation and transformation process adapting to coal gas. The process at least comprises two stages of multifunctional catalytic reactions. The process comprises the following steps: in a reactor, by adopting a multifunctional composite catalyst with integrated transformation, hydrolysis and methanation functions, performing reactions such as partial methanation, transformation and organic sulfur hydrolysis and hydrogenolysis to meet the self-heat balance of a system and regulate a reasonable ratio of hydrogen to carbon, wherein (H2-CO2) / (CO+CO2) is approximately equal to 3:1; enabling the transformation rate of organic sulfur to reach 99% so as to provide qualified raw material gas for a methanation synthesis section which is used for preparing natural gas or liquefied natural gas. The multifunctional sulfur-resistant methanation and transformation process provided by the invention has the advantages of steam conservation, low energy consumption, low equipment investment and low operation cost, can be used for solving the problems of raw material gas pre-treatment, difficultly-controllable transformation depth and unstable organic sulfur hydrolysis and operation before methanation synthesis at present, and has relatively good economic and environment-friendly benefits.

Description

technical field [0001] The invention provides a multi-functional sulfur-resistant methanation conversion process suitable for coal-to-gas, specifically a new process for sulfur-resistant methanation, conversion and organic sulfur hydrolysis using sulfur-containing CO raw material gas as raw material. craft. Background technique [0002] Coal, oil and natural gas are the three pillars of energy in the world today. my country is poor in oil and gas, but rich in coal resources. In recent years, with the rapid development of the national economy, natural gas, as a clean and efficient energy source, has rapidly increased its proportion in energy consumption. At present, the domestic demand for natural gas far exceeds the supply. Therefore, coal-to-natural gas technology can not only It meets the growing market demand, and is of great significance to my country's energy security, energy conservation and emission reduction. [0003] Although the coal-to-natural gas technology is b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 纵秋云李袖章刘博男荆宏建高辉肖杰飞张晋王利军杜卫东曲思秋孙波林彩虹何志灵袁红娟杨鹏飞郭栋
Owner 青岛联信催化材料有限公司
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