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Underground coal gasification ignition system and method

An underground gasification and coal technology, applied in coal gasification, underground mining, earth drilling and mining, etc., can solve the problems of difficult control of the gasification process, interruption of the gasification process, unstable operation, etc., and achieve simple operation, good effect, low cost effect

Pending Publication Date: 2022-07-15
SHAANXI SHANMEI CHENGHE MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the operation of the gasifier, due to geological structures such as faults and folds in the formation, the directional horizontal well partially enters the top and bottom of the coal seam, and the coal seam of the gasification working face is discontinuous, resulting in the interruption of the gasification process; or, during the gasification During the process, due to operation, control and other reasons, the flame working surface of the gasifier is uncontrolled and far away from the gas injection point, which will also make the gasification process difficult to control and unstable in operation

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  • Underground coal gasification ignition system and method

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Embodiment 1

[0035] An underground coal gasification ignition system, such as figure 1 As shown, the UCG ignition system includes a retracted coiled tubing 1 and an oil storage pressure tank 2. In the coiled tubing, there are oxygen-enriched gas injection pipelines 101 and water injection pipelines 102, and oxygen-enriched gas injection pipelines 101 and water injection pipelines. The front end of 102 is connected to the coiled tubing nozzle, and the rear ends of the oxygen-enriched gas injection pipeline 101 and the water injection pipeline 102 are respectively connected to the oxygen-enriched gas transmission station 3 and the water transmission station 4 in the ground control room. The pipeline of the water injection pipeline 102 in the oil pipe 1 is sequentially provided with a high-pressure gas intake port 102-1, an oil storage pressure tank intake port 102-2, an oil storage pressure tank oil outlet port 102-3, and a high-pressure gas intake port 102-1 is connected to the high pressur...

Embodiment 2

[0041] A method for ignition of underground coal gasification is based on the ignition method of the ignition system for underground coal gasification of embodiment 1. Therefore, the content in embodiment 1 should be regarded as the content in this embodiment, and the gasifier is in normal operation. In the state, the first valve, the second valve and the third valve are opened, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve are closed. Detect the oxygen content in the gas at the outlet of the gasifier, monitor the temperature of the coiled tubing nozzle and the pressure in the gasifier; when the temperature of the coiled tubing nozzle is lower than 800 ℃ and continues to drop, the oxygen content in the outlet gas continues to be higher than 0.5% or more, It shows that the gasification and combustion in the furnace are unstable. At this time, the gasifier needs to be injected with oil for ignition, and the ignition method includes the...

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Abstract

The invention discloses a coal underground gasification ignition system and method.The system comprises a retreating type continuous oil pipe and an oil storage pressure tank, an oxygen-enriched gas injection pipeline and a water injection pipeline are arranged in the continuous oil pipe, and the oxygen-enriched gas injection pipeline and the water injection pipeline are connected with an oxygen-enriched gas transmission station and a water transmission station of a ground control room respectively; a high-pressure gas inlet connector, an oil storage pressure tank gas inlet connector and an oil storage pressure tank oil outlet connector are sequentially arranged in a pipeline from a water delivery station to a water injection pipeline in the coiled tubing, the high-pressure gas inlet connector is connected with a high-pressure gas source, and the oil storage pressure tank gas inlet connector and the oil storage pressure tank oil outlet connector are respectively connected with an oil storage pressure tank. The method comprises the steps of injecting diesel oil into the oil storage pressure tank and injecting oil into the gasification furnace, a fire area can be quickly led to the position near the spray head through the method, and the fire area can be clearly confirmed through temperature measurement of a thermocouple of the spray head; compared with processing measures adopted in the prior art, an operation system is simple, operation is easy and convenient, and repeated operation can be achieved.

Description

technical field [0001] The invention relates to an underground coal gasification ignition system and method, which can assist in adjusting the position and temperature of an oxidation zone of a gasifier, and is suitable for stable production of underground gasification gas. Background technique [0002] UCG technology can not only recover coal resources abandoned in mines, but also can be used to mine thin coal seams, deep coal seams, "three lower" coal pressing and high sulfur, high Ash and high gas coal seams; the ash and slag after underground gasification and combustion remain underground, reducing the surface subsidence, no solid matter emission, and the gas can be purified in a centralized manner, which greatly reduces the damage to the environment during coal mining and use; underground gas The coal gas can not only be used directly for civil use and power generation as fuel gas, but also can be used to extract pure hydrogen or be used as raw material gas for syntheti...

Claims

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Application Information

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IPC IPC(8): E21B43/295E21B34/06
CPCE21B43/295E21B34/066
Inventor 刘朝阳
Owner SHAANXI SHANMEI CHENGHE MINING