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Device and process for preparing methane by coal chemical looping catalytic gasification based on calcium oxide

A chemical chain catalytic gas, calcium oxide technology, applied in gasification process, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low methane yield and large catalyst usage and other problems, to achieve the effect of realizing self-heating balance, speeding up the gasification reaction rate and facilitating separation

Inactive Publication Date: 2020-04-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is suitable for a wide range of coal types, low cost, and environmentally friendly, but it also faces many problems, such as low methane production rate and large catalyst usage

Method used

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  • Device and process for preparing methane by coal chemical looping catalytic gasification based on calcium oxide
  • Device and process for preparing methane by coal chemical looping catalytic gasification based on calcium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A calcium oxide-based coal chemical looping catalytic gasification methane production process, comprising the following steps:

[0038]1) Put coal, catalyst, and calcium oxide reaction raw materials 11 of different particle sizes into the fluidized bed gasification reactor 3 sequentially through the balance lock hopper 1 and the feed hopper 2, and the superheated steam 14 and the circulating methane-lean gas 21 are fed into the fluidized bed gasification reactor 3. The bottom of the fluidized bed gasification reactor 3 is passed through, and catalytic gasification, water vapor shift, and methanation reactions occur in the fluidized bed gasification reactor 3 to generate gas rich in methane; Carbon dioxide undergoes carbonation reaction to generate calcium carbonate, and the released reaction heat supplements the heat required for gasification reaction to achieve the self-heating balance of the system;

[0039] 2) The methane-enriched gas carries calcium carbonate and se...

Embodiment 2

[0047] use figure 1 Shown technological process, operation steps are as embodiment 1.

[0048] Ningxia lignite is used, and the particle size of pulverized coal is 3-5 mm. The particle size of calcium oxide is 100-200 μm. The catalyst is an alumina-supported catalyst, its mass percentage is: K: 20%, Ca: 5%, Fe: 15%, and the particle size of the catalyst is 600-800 μm.

[0049] The operating pressure is 3.0 MPa, the operating temperature of the gasification reactor is 700 °C, and the operating temperature of the calcination reactor is 1000 °C.

Embodiment 3

[0051] use figure 1 Shown technological process, operation steps are as embodiment 1.

[0052] Shenmu bituminous coal is used, and the coal powder particle size is 3-5 mm. The particle size of calcium oxide is 200-300 μm. The catalyst is an alumina-supported catalyst, its mass percentage is: K: 25%, Ca: 5%, Fe: 10%, and the particle size of the catalyst is 600-800 μm.

[0053] The operating pressure is 6.0 MPa, the operating temperature of the gasification reactor is 850 °C, and the operating temperature of the calcination reactor is 950 °C.

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Abstract

The invention discloses a device and process for preparing methane by coal chemical looping catalytic gasification based on calcium oxide, and belongs to the field of energy and chemical industry. Thedevice is composed of a feeding device, a fluidized bed gasification reactor, a calcination reactor and a gas purification and separation device. Coal, a catalyst and calcium oxide undergo a methanation reaction in a fluidized bed gasification reactor, calcium oxide and carbon dioxide react to generate calcium carbonate, balance is promoted to move to methane generation, and meanwhile heat neededby the gasification reaction is supplemented, calcium carbonate is decomposed into calcium oxide and carbon dioxide in a calcining reactor, calcium oxide is returned to the fluidized bed gasificationreactor for cyclic utilization, and coal gas generated in the fluidized bed gasification reactor is purified and separated so that high-purity methane is obtained. The process has the advantages of simple technological process, self-heating balance of the system, low carbon and high efficiency.

Description

technical field [0001] The invention relates to a coal chemical chain catalytic gasification methane production device and process based on calcium oxide, which belongs to the field of energy and chemical industry. Background technique [0002] Using efficient and clean coal gasification technology to convert coal into natural gas is an energy technology approach in line with my country's national conditions. The traditional coal-to-natural gas process is the "two-step process". Coal is first gasified to generate synthesis gas, and the synthesis gas enters the methane synthesis unit after water-gas shift. This process technology is relatively mature and has become the most advanced coal-to-natural gas project at home and abroad The main application technology. However, due to the existence of air separation unit, steam-oxygen gasifier and catalytic methanation reactor, the technology has high investment per unit output and low process efficiency. [0003] Coal-to-synthetic...

Claims

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Application Information

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IPC IPC(8): C10J3/56C10J3/84C10J3/86C10L3/08B01J23/78
CPCB01J23/78C10J3/56C10J3/84C10J3/86C10J2300/093C10J2300/0966C10J2300/0976C10L3/08Y02P20/129Y02P20/52
Inventor 李春玉周兴赵建涛黄戒介房倚天宋双双张永奇余钟亮冀少华
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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