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Coal underground gasification system and control method

A technology of underground gasification and control method, which is applied in coal gasification, underground mining, earthwork drilling and other directions, can solve the problems of cumbersome layout of underground gasification production units, impact on personnel safety, etc., and achieves improved stability, combustion quality and structure. The effect of stable strength and avoiding movement

Active Publication Date: 2015-04-29
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above-mentioned Chinese patent technology has the following two disadvantages: (1), the layout of the underground gasification production unit is relatively cumbersome, such as the setting and installation of sealing walls, pipelines, etc.; (2), underground work requires personnel to carry out underground operations, However, once an accident occurs, the safety of personnel will be greatly affected

Method used

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  • Coal underground gasification system and control method
  • Coal underground gasification system and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0051] with oxygen and CO 2 It is a gasification agent, and the initial intake air volume is 2500Nm 3 / h, the oxygen concentration is about 60%; and the calorific value of gas per unit volume is set to 1400Kcal / Nm 3 , the initial volume V1 is 300m 3 .

[0052] The real-time volume V of the burn-off zone 空 is monitored, when the real-time volume of the burn-out zone V 空 up to 300m 3 Around, and the calorific value per unit volume of gas falls within 1540-1680Kcal / Nm 3 interval, and there is still a downward trend, start filling.

[0053] The flow rate of the filling is converted according to the volume converted from the hourly coal consumption, for example, the hourly coal consumption is 3.5 tons, and the coal density is 1.43 tons / m 3, the amount of filler injected per hour is 2.45m 3 . Continue to monitor the gas composition and the real-time volume of the burn-up area. When the real-time volume of the burn-up area reaches the limit value of the burn-up area, for exa...

Embodiment 2

[0055] Oxygen and air are used as gasification agents, and the initial air intake is 2500Nm 3 / h, the oxygen concentration is about 60%; and the calorific value of gas per unit volume is set to 1000Kcal / Nm 3 , the initial volume V1 is 200m 3 .

[0056] The real-time volume V of the burn-off zone 空 is monitored, when the real-time volume of the burn-out zone V 空 up to 200m 3 Around, and the calorific value per unit volume of gas falls within 1100-1200Kcal / Nm 3 interval, and there is still a downward trend, start filling.

[0057] The flow rate of the filling is converted according to the volume converted from the hourly coal consumption, for example, the hourly coal consumption is 5 tons, and the coal density is 1.43 tons / m 3 , the amount of filler injected per hour is 3.49m 3 . Continue to monitor the gas composition and the real-time volume of the burn-off zone. When the real-time volume of the burn-off zone reaches the volume limit of the burn-off zone, it is the sam...

Embodiment 3

[0059] with oxygen and CO 2 It is a gasification agent, and the initial intake air volume is 2500Nm 3 / h, the oxygen concentration is about 60%; and the calorific value of gas per unit volume is set to 1400Kcal / Nm 3 , the initial volume V1 is 300m 3 .

[0060] The real-time volume V of the burn-off zone 空 is monitored, when the real-time volume of the burn-out zone V 空 up to 300m 3 Around, and the unit gas calorific value falls within 1540-1680Kcal / Nm 3 interval, and there is still a downward trend, start filling. Begin by quickly filling 20% ​​of the burn area with gravel, leaving 80% of the burn area for subsequent filling. Specifically, according to the measured bulk density of gravel is 1500kg / m 3 , then the calculation shows that the required rapid filling capacity is 300×1500×80%=360000kg. Then the remaining 80% of the combustion area is subsequently filled, and the flow rate of the filling is converted according to the volume converted from the hourly coal cons...

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Abstract

The invention relates to a coal underground gasification system and a control method. The coal underground gasification system comprises a bottom plate, a top plate, a first directional drill, a second directional drill and a vertical well, wherein the first directional drill penetrates through the top plate and a target coal layer, is bent, extends into a combustion area, and is communicated with the combustion area; the vertical well is communicated with the communication area; the second directional drill penetrates through the top plate, is bent, and is communicated with the communication area; an air inlet passage is arranged in the first directional drill and is communicated with the combustion area; a first filling material conveying pipeline is arranged in the second directional drill, a second filling material conveying pipeline is arranged in the vertical well, and the first filling material conveying pipeline and the second filling material conveying pipeline are communicated with the combustion area. The coal underground gasification system has the advantages that by filling the combustion area, the size of the combustion area is in a dynamic balance state, the fluctuating and insufficiency of a gasification agent caused by the expansion of the combustion space area are avoided, and the stability of combustion strength and the combustion quality are improved; the defects of movement, cracking damage and surface sinking of a coal rock layer above the combustion space area are avoided, and the production safety of a gasification furnace is improved.

Description

technical field [0001] The invention relates to the relevant technical fields for drilling or geological exploration, in particular to an underground coal gasification system and a control method. Background technique [0002] Underground coal gasification technology integrates the three major processes of well construction, coal mining and surface gasification. It directly burns underground coal in a controlled manner to obtain combustible gas. Underground coal gasification technology transforms traditional coal mining into chemical coal mining, eliminating the need for huge coal mining, transportation, washing, gasification and other processes and equipment, and has the advantages of good safety, low investment, high efficiency, and less pollution. advantage. [0003] In the process of underground coal gasification, the coal is burned and gasified leaving a burn-off zone. Moreover, during the gasification process, the coal above and on both sides of the burn-out zone wil...

Claims

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Application Information

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IPC IPC(8): E21B43/243E21F15/00
CPCE21B43/295E21F15/00
Inventor 王宁博
Owner ENN SCI & TECH DEV
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