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Process and device for producing methane-rich coal gas by moving bed pressurized coal gasification

A technology of pressurized gasification and moving bed, which is applied in fixed bed gasification, chemical industry, sustainable manufacturing/processing, etc., to achieve the effect of extending the length of time period, improving thermal efficiency and increasing production rate

Inactive Publication Date: 2015-09-23
李宁
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  • Claims
  • Application Information

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Problems solved by technology

This case proposes a moving bed pressurized gasification process technical solution to solve it

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  • Process and device for producing methane-rich coal gas by moving bed pressurized coal gasification
  • Process and device for producing methane-rich coal gas by moving bed pressurized coal gasification
  • Process and device for producing methane-rich coal gas by moving bed pressurized coal gasification

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Embodiment Construction

[0070] The specific implementation method is described with the methane-enriched coal gas scale device required to produce 1 million Nm3 natural gas per day;

[0071] 4 Φ3.8m pressurized fixed-bed gasifiers, bed height-to-diameter ratio 1.5;

[0072] Gasification pressure 3.0MPa;

[0073] Gasification cycle T=240 seconds, T1=100 seconds, T2=10 seconds, T3=120 seconds, T4=10 seconds;

[0074] Raw coal contains 35% water; calorific value ~ 15MJ / kg; ash melting point T2 ~ 1200°C; lignite, volatile matter 48%; coal particle size 15mm ~ 70mm;

[0075] Oxygen 10000Nm per hour 3 / h (heat consumption 6MJ / Nm 3 ); Steam 50t / h (4MJ / kg); Hydrogen 60000Nm 3 / h(14MJ / Nm 3 ); isolation inert gas 100Nm 3 / h(3MJ / Nm 3 );

[0076] Raw coal consumption per hour is 140t / h, (15MJ / kg);

[0077] The composition and volume of methane-rich gas are shown in the table below:

[0078]

[0079] Total output of oil hydrocarbons per hour: ~8t / h (average calorific value 35MJ / kg);

[0080] The tot...

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Abstract

Provided are a process and device for producing methane-rich coal gas by moving bed pressurized coal gasification, and the height-to-diameter ratio of a coal gasification bed layer in a moving bed pressurized gasification furnace is improved to optimize gasification conditions for optimizing the methane production rate. On an oxygen-rich steam charging pipeline at the bottom of the gasification furnace, a hydrogen gasification agent adding pipeline is additionally arranged, an oxygen-rich steam gasification agent and a hydrogen gasification agent are respectively sent into the pressurized gasification furnace from the furnace bottom in turn, and a technological process for preparation of low-methane water coal gas through oxygen-rich steam and a technological process for preparation of high-methane hydrogen coal gas through hydrogen are cyclically repeatively performed on a furnace internal carbon layer. Before the two charging gasification agents are transformed with each other, an inert gas displacement process is designed, so as to prevent the two gasification agents from meeting with each other in the charging pipeline and the furnace bottom interior to prevent safety accident. Because the technological process for preparation of the high-methane hydrogen coal gas through hydrogen is increased in the moving bed pressurized coal gasification technology, the methane content in coal gas is substantially increased, not only can the coal gas heat value be improved but also the coal-to-gas thermal efficiency is improved.

Description

technical field [0001] The invention belongs to the field of coal gasification, and in particular relates to a process technology and flow device for producing methane-enriched coal gas by moving bed (fixed bed) pressurized coal gasification. Background technique [0002] One of the main methods of coal-to-natural gas (SNG) is to first produce coal gas containing more methane. At present, there are mainly three kinds of process methods, namely fixed bed (moving bed) pressurized coal gasification method, coal hydrogenation gasification method and coal steam catalytic gasification method. [0003] Fixed bed (moving bed) pressurized coal gasification can produce coal gas containing about 11% methane, such as the coal gasification process of coal-to-natural gas produced by Great Plains Company of the United States, China Datang Keqi and Fuxin, etc., all adopt moving bed (fixed bed ) pressurized coal gasification process device, that is, the Lurgi furnace pressurized coal gasifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/06C10J3/20C10J3/66C10J3/84
CPCY02P20/10
Inventor 李宁
Owner 李宁
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