Symbolic gas detecting, regulating and controlling method for underground coal gasification

An underground gasification and gas technology, which is applied in the fields of measurement, production of fluids, and earthwork drilling, can solve the problems of low gas calorific value, short service time, unstable gas production, etc., and achieve high gas calorific value and long service time. , Combustible components and stable effect of gas production

Inactive Publication Date: 2005-09-14
LIAONING TECHNICAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0006] 1. There is no control method or the control method is backward, which often makes the gasification process out of control; 2. The scale of the gasification furnace is small, the gas production of a single furnace is small, and the service time is short; 3. The content of combustible components in the mixed gas is low; 4. 1. The calorific value of coal gas in the mixed gas is low, and it is difficult to form a commercial development; 5. The concentration, composition and calorific value of the combustible gas are different from the gasification of the ground gasifier; 6. The oxidation zone and reduction in the gasification working face The range of the combustion zone and the retort zone (abbreviation: three zones) changes with the advancement of the combustion zone, coupled with the fluctuation of the combustible gas concentration and calorific value, resulting in unstable gas production

Method used

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  • Symbolic gas detecting, regulating and controlling method for underground coal gasification
  • Symbolic gas detecting, regulating and controlling method for underground coal gasification
  • Symbolic gas detecting, regulating and controlling method for underground coal gasification

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Embodiment Construction

[0027] Refer to attached figure 1 , an underground coal gasification system consisting of oxidant inlet borehole 1, gas outlet borehole 3, rock and soil cover layer 4, roof and floor rock layers 5, 7, and underground coal seam 6, which is characterized in that the thickness of the underground coal seam 6 and inclination angle to ensure the continuous and stable gasification space for underground coal gasification, determine the length L of the gasification channel 13 in the underground coal gasification system q :

[0028] L q ≥ L y +L h +V s t

[0029] In the formula: L y - regulate the length of the oxidation zone, m;

[0030] L h - regulate the length of the reduction zone, m;

[0031] V s -Propelling speed of the burning face, m / d;

[0032] t-gasification one-way operation time, day;

[0033] L y =16Re 0.16 d n

[0034] In the formula: Re-Reynolds number; d-fluid equivalent value;

[0035] d=2hw / (h+...

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Abstract

The invention relates to a detecting and controlling method for coal underground gasification indicating gas that belongs to underground coal developing. The invention supplies an enforceable controlling method for coal underground gasification producing. And a new aspect is supplied for the developing of coal industry.

Description

technical field [0001] The invention belongs to a method for developing and utilizing underground coal, in particular to a method for detecting and controlling a marker gas of underground coal gasification. technical background [0002] Underground coal gasification was first conceived by German chemist William Simmons in 1868. Russian chemist Mendeleev and others formally proposed the process idea of ​​underground coal gasification in 1888 and implemented field experiments. In the 1930s, the former Soviet Union established the first well-type experimental gasification station and the well-free experimental gasification station; in 1935, five experimental gasification stations were built in the suburbs of Moscow, Donbass and Kuzbass. In 1936, it entered the industrial test stage from the experimental stage; in 1940, two UCG stations in Donbass and the suburbs of Moscow were put into production. In 1941, the gasification station in the suburbs of Moscow technically solved the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B49/08
Inventor 张彬孙宝铮许振良姜福川
Owner LIAONING TECHNICAL UNIVERSITY
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