CN-122006432-A - Efficient treatment device and method for coal mine gas

Abstract

The invention relates to a coal mine gas efficient treatment device and a method, wherein the treatment device comprises a cooling section and a dehydration section which are sequentially connected through an air inlet pipeline, the cooling section is provided with a heat exchanger, the dehydration section is provided with a main steam-water separator, the air inlet end of the heat exchanger is provided with a bypass air circuit, the dehydration section is provided with a secondary steam-water separator, the bypass air circuit is connected with the air inlet end of the secondary steam-water separator, and the air outlet end of the secondary steam-water separator is connected to the air inlet end of the main steam-water separator. The invention can solve the problems of poor gas dehydration effect and low power generation efficiency caused by the water content of the gas source and pressure fluctuation by reasonably arranging the auxiliary steam-water separator.

Inventors

• DING JIAN
• JIN KE
• SHI PENGFEI
• JIN QIANG
• FAN TIANNAN
• XIN ZHIYUAN
• WANG XIAOMIN
• WU HAOXIN
• ZHANG LI
• CHANG YUNFEI

Assignees

• 焦作煤业（集团）有限责任公司

Dates

Publication Date

20260512

Application Date

20260306

Claims (8)

1. 1. The utility model provides a colliery gas high-efficient processing apparatus, includes cooling section and dehydration section that connects gradually through the air inlet line, and the cooling section is provided with the heat exchanger, and the dehydration section is equipped with main vapour-water separator, its characterized in that, the air inlet of heat exchanger is equipped with the bypass gas circuit, and the dehydration section is equipped with vice vapour-water separator, and the bypass gas circuit is connected with vice vapour-water separator's air inlet, and vice vapour-water separator's the end of giving vent to anger is connected to main vapour-water separator's air inlet.
2. 2. The efficient coal mine gas treatment device according to claim 1, wherein the main steam-water separator and the auxiliary steam-water separator are cyclone steam-water separators.
3. 3. The efficient coal mine gas treatment device according to claim 1, wherein a flow distribution valve is arranged at the joint of the bypass gas circuit and the gas inlet end of the heat exchanger.
4. 4. A coal mine gas efficient processing apparatus according to claim 3, wherein the secondary steam-water separator and the primary steam-water separator are respectively connected with a separate water tank provided with a liquid level meter.
5. 5. A coal mine gas efficient processing apparatus according to claim 3, wherein the heat exchanger air inlet end is provided with a pressure detection point, the pressure detection point being located upstream of the flow distribution valve.
6. 6. A coal mine gas high-efficiency treatment method is characterized in that the coal mine gas high-efficiency treatment device is used, and when the dehydration amount of a secondary steam-water separator is increased, the bypass gas path flow is increased.
7. 7. The efficient treatment method for the coal mine gas is characterized in that the bypass gas path flow rate is increased when the pressure detected by the pressure detection point is reduced by using the efficient treatment device for the coal mine gas according to claim 5.
8. 8. A method of efficiently treating coal mine gas as claimed in claim 6 or claim 7 wherein the flow of cooling water to the heat exchanger is increased when the bypass air path flow is increased.

Description

Efficient treatment device and method for coal mine gas Technical Field The invention belongs to the technical field of gas power generation, and particularly relates to a coal mine gas efficient treatment device and method. Background Low concentration gas typically refers to mine drainage gas having a concentration of between 6% and 30%. Such gases are traditionally difficult to directly utilize because of their relatively low concentration, flammability, and explosiveness. By employing multi-stage flame arresters and water mist delivery systems, low concentration gas has been widely used for power generation. The temperature and the water content of the gas have a great influence on the power generation efficiency of the gas, especially the water content of the gas. On one hand, the concentration of the gas-air mixed gas entering the engine cylinder is unstable and fluctuates due to the existence of moisture, so that the fuel supply is caused to be suddenly high and suddenly low, the combustion process cannot be fully and stably carried out, and the effective power generation power of the gas in unit volume is seriously weakened. In addition, continuous water-containing gas flows through the inside of the generator set, so that corrosion, abrasion and scaling of key components are aggravated, equipment maintenance frequency is increased, maintenance cost is increased, fault-free continuous operation time of equipment is shortened, and finally adverse effects are generated on the service life of the equipment. The circulating water cooling device adopted at present can better control the temperature of gas, and in addition, the water content of the gas can be reduced through a steam-water separator. The water in the gas source is derived from water existing in coal beds, water for drilling construction, water brought in by underground wet environment and water ring pump extraction, so that the problem of fluctuation of water content exists, and the problem of large fluctuation of daily dehydration amount of the steam-water separator can be particularly shown. Meanwhile, the gas source also has the problem of pressure fluctuation, and the fluctuation can have great influence on the dehydration rate of the steam-water separator, so that the dehydration effect of the gas is poor, and the gas power generation efficiency is further influenced. Disclosure of Invention Aiming at the defects existing in the prior art, the invention firstly provides a coal mine gas efficient treatment device, which comprises the following specific scheme: the utility model provides a colliery gas high-efficient processing apparatus, includes cooling section and dehydration section that connects gradually through the air inlet line, and the cooling section is provided with the heat exchanger, and the dehydration section is equipped with main vapour-water separator, the air inlet of heat exchanger is equipped with the bypass gas circuit, and the dehydration section is equipped with vice vapour-water separator, and the bypass gas circuit is connected with vice vapour-water separator's air inlet, and vice vapour-water separator's the end of giving vent to anger is connected to main vapour-water separator's air inlet. Further, the main steam-water separator and the auxiliary steam-water separator are both cyclone steam-water separators. The cyclone type steam-water separator is based on the principle that the air source rotates at high speed along the spiral direction after entering the separator, and water drops in the air are thrown to the wall of the separator under the action of centrifugal force and discharged by gravity, so that the gas-liquid separation is realized. The dewatering efficiency is affected by the gas flow rate and the water content. When the air source pressure is low, the air flow rate is small, the centrifugal acting force of water drops can be reduced, and the dehydration efficiency is reduced. If the water content of the air source is too large and exceeds the load, the thickness of the water film on the wall of the air source is large, and the water film is easily taken away again by the air flow, so that the dehydration efficiency is reduced. By arranging the auxiliary steam-water separator, a part of air source can be introduced into the auxiliary steam-water separator along the bypass air path for dehydration treatment. When the water content of the air source is too large, the scheme can reduce the work load of the main steam-water separator. In addition, in the prior art, the air source enters the steam-water separator for dehydration after being cooled by the heat exchanger, the pressure loss of 0.1-0.2MPa can be generated by the heat exchanger, and the bypass air path directly enters the auxiliary steam-water separator without the heat exchanger, so that the pressure loss can be avoided. Further, a flow distribution valve is arranged at the joint of the bypass gas circuit and the air inlet end of the he