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Method for quenching underground coal gasifier

A technology for underground gasification and coal, applied in coal gasification, underground mining, construction, etc., can solve the problems of unfeasible, difficult access for firefighters, etc., and achieve the effect of easy implementation, simple operation, and easy control.

Active Publication Date: 2012-07-18
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Eighth existing technology, the patent US005909777A "METHOD AND APPARATUS FORSTOPPING THE SPREAD OF A FH2E IN AN UNDERGROUND MINE" proposes a prefabricated movable water pipe and nozzle under the coal mine to solve the problem that it is difficult for firefighters to enter when an underground fire occurs
This patent is mainly a solution to the fire in the coal mine production or the re-ignition of the abandoned mine. Since it is difficult for people to go down the underground gasification furnace to operate it, it is basically not feasible to shut down the underground gasification furnace.

Method used

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  • Method for quenching underground coal gasifier
  • Method for quenching underground coal gasifier
  • Method for quenching underground coal gasifier

Examples

Experimental program
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Embodiment 1

[0039] figure 1 A schematic diagram of an underground coal gasifier in which the method of the present invention may be implemented is shown. Such as figure 1 As shown, a typical underground coal gasifier includes a number of gas inlet and outlet boreholes 1, 2 and 3, a coal seam 4 and a burnout area 5 distributed at different positions in the gasifier area. The gas inlet and outlet boreholes 1 , 2 and 3 extend from the surface 6 into the coal seam 4 via the formation 7 . During the coal gasification process, borehole 1 is used as an air intake channel for introducing various gasification agents that promote coal seam combustion and gasification, and borehole 2 or 3 is used as a gas outlet channel for discharging coal seam combustion and gasification. gas products. The other of boreholes 2 or 3 may also be a passage for other purposes such as observation.

[0040] During the gasification process, the burn-out zone 5 gradually formed in the coal seam with the combustion of ...

Embodiment 2

[0048] The furnace extinguishing method of embodiment 2 is basically the same as embodiment 1, only difference is, in figure 1 During the shutdown process of the shown underground coal gasifier, the gas in the burn-out area 5 is extracted in turn through the three inlet and outlet holes 1, 2 and 3. Outside the gas pipeline, other pipelines are closed. This method can also achieve rapid and uniform negative pressure extraction, thereby enabling rapid shutdown.

[0049] other embodiments

[0050] Embodiments 1 and 2 illustrate the shutdown method of an underground coal gasifier according to the present invention by taking a specific gasifier as an example. However, the present invention is not limited to specific examples. For example, according to the modified implementation of embodiment 1 or 2, it is also possible to draw air through only one or two air inlet and outlet holes, and at the same time close other air inlet and outlet holes to form a negative pressure in the bu...

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Abstract

Disclosed is a method for quenching an underground coal gasifier. The underground coal gasifier comprises a burned-out area and at least one pipe extending from the burned-out area to the ground. The method includes: connecting an exhaust fan to an outlet of each pipe; and operating the exhaust fans to pump out gas in the burned-out area to vacuum the burned-out area, and accordingly guiding water in a surrounding of the burned-out area into the burned-out area to quench the gasifier, wherein when at least one pipe is used for vacuuming, other pipes are sealed. The method is simple in operation, easy in control and easy in implementation, and the cost is low as no extra equipment is needed.

Description

technical field [0001] The invention relates to the field of underground coal gasification process control, in particular to a method for shutting down an underground coal gasification furnace. Background technique [0002] Underground coal gasification is a technology that converts underground coal into combustible gas in situ through thermochemical reactions. It is a new technology that integrates the three major processes of well construction, coal mining and conversion, and multidisciplinary development of energy and chemical raw materials. It transforms the physical coal mining method into chemical coal mining, abandons all the huge and heavy coal mining equipment and ground gasification equipment, and transforms the traditional ground combustion into underground controlled combustion, so it is a clean coal comprehensive Using technology, it has the advantages of good safety, low investment, high efficiency, low pollution and high benefit. [0003] Underground coal gas...

Claims

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Application Information

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IPC IPC(8): E21B43/295
Inventor 刘洪涛陈峰潘霞
Owner ENN SCI & TECH DEV
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