Device and method for directly preparing methane based on coal chemical chain gasification

A chemical chain and coal methane technology, applied in chemical instruments and methods, organic chemistry, carbon compound catalysts, etc., can solve the problems of complex catalyst recovery process, slow reaction speed, low carbon conversion rate, etc., and achieve low cost and high production volume Less carbon dioxide and high carbon utilization efficiency

Active Publication Date: 2016-12-14
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The reaction is an exothermic reaction and does not require a large amount of external heat to maintain the temperature of the reaction system. The thermal efficiency can be close to 80%, but the source of hydrogen in the reactants is the main problem; the catalytic steam gasification method uses alkali metal carbon Hydroxide or alkali metal hydroxide is used as a catalyst, and water vapor is used as a gasification agent to couple low-temperature catalytic gasification of coal and methanation of syngas in one reactor to directly generate methane-enriched gas, but this process has a slow reaction rate. , low carbon conversion rate, complex catalyst recovery process, greenhouse gas CO 2 Disadvantages such as large amount of generation

Method used

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  • Device and method for directly preparing methane based on coal chemical chain gasification
  • Device and method for directly preparing methane based on coal chemical chain gasification

Examples

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Embodiment 1

[0033] The main structure of the device for directly producing methane based on coal chemical looping gasification described in this embodiment includes a solid feeder 1, a chemical looping gasification reactor 2, a regeneration reactor 4, a first flow control device 3, and a second flow control device. Device 7, first gas pre-distribution chamber 6, second gas pre-distribution chamber 8, third gas pre-distribution chamber 10, first gas distribution plate 5, second gas distribution plate 9, third gas distribution plate 11, cyclone separation device 12, gas separation unit 13, gas purification unit 14, and slag outlet 15; the diameter ratio of the upper and lower parts of the chemical looping gasification reactor 2 is 1.2 to 5, and the lower part of the chemical looping gasification reactor 2 is the hydrogen generation section III , the flow pattern is a fast fluidized bed flow pattern, and the fluidized medium is water vapor or carbon dioxide; the upper part is respectively fro...

Embodiment 2

[0057] On the basis of Example 1, this embodiment adds a separate solid pyrolysis device 16 and dipleg 17, and the solid pyrolysis device 16 communicates with the chemical looping gasification reactor 2 through the dipleg 17. When preparing methane, first Send coal powder particles of 0.1 to 1mm into the solid pyrolysis device 16 for coal pyrolysis reaction to obtain coal tar, and the generated semi-coke enters the coal chemical looping gasification reactor 2 through the dipleg 17, and the remaining steps are the same as in Example 1 , the device and method can realize the graded utilization of coal and the graded utilization of heat.

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Abstract

The invention belongs to the technical field of preparation of substitutive natural gas from coal, and relates to a device and method for directly preparing methane based on coal chemical chain gasification. Pulverized coal particles pass through the upper portion of a chemical chain gasification reactor and enter a chemical chain gasification reactor, oxidation state multifunctional composite oxygen carrier particles and unreacted carbon in the pulverized coal particles enter a regeneration reactor on the upper portion of a coal methanation section through a first flowing control device, coal slag obtained after reacting is discharged through a slag discharging opening, gas separated by a cyclone separator sequentially passes through a gas purifying unit and a gas separation unit, methane gas is obtained, and coal ash obtained after separation of the cyclone separator, part of unreacted carbon and the oxidation state multifunctional composite oxygen carrier particles return to the chemical chain gasification reactor or the regeneration reactor again to be recycled. The device is simple in structure and convenient to operate, the process theory is scientific, the raw materials are easy to obtain, cost is low, thermal efficiency is high, the carbon utilization efficiency is high, fewer pollutants are generated, and environmental friendliness is achieved.

Description

Technical field: [0001] The invention belongs to the technical field of replacing natural gas with coal, and relates to a device and method for directly preparing methane based on coal chemical chain gasification, and is also applicable to other solid fuels such as coal coke, biomass and solid waste. Background technique: [0002] The characteristics of my country's fossil energy reserves are "rich in coal, poor in oil, and low in gas". For a long time to come, my country's primary energy consumption will be dominated by coal. In my country's energy production structure, coal accounts for 3 / 4, and in the energy consumption structure, coal accounts for 2 / 3. In the next 10-30 years, my country's primary energy will be dominated by coal. At present, the proportion of natural gas in primary energy consumption in my country is low, only 4.4% in 2012; while the proportion of primary energy consumption of natural gas in the world is 24%, and it reaches 34% in European and American ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/04C07C1/00
CPCC07C1/00C07C1/0405C07C2527/232C10J3/00C07C9/04
Inventor 刘永卓郭庆杰刘涛岳永强燕希敏张秀丽汪合龙
Owner QINGDAO UNIV OF SCI & TECH
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