CN204783094U - Harmless liquid nitrogen system that administers coal field fire district - Google Patents
Harmless liquid nitrogen system that administers coal field fire district Download PDFInfo
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- CN204783094U CN204783094U CN201520333257.9U CN201520333257U CN204783094U CN 204783094 U CN204783094 U CN 204783094U CN 201520333257 U CN201520333257 U CN 201520333257U CN 204783094 U CN204783094 U CN 204783094U
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 57
- 239000003245 coal Substances 0.000 title abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000010248 power generation Methods 0.000 abstract description 14
- 238000007605 air drying Methods 0.000 abstract description 10
- 230000002265 prevention Effects 0.000 abstract description 7
- 230000001066 destructive effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 206010035148 Plague Diseases 0.000 description 1
- 238000010795 Steam Flooding Methods 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000007613 slurry method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Separation By Low-Temperature Treatments (AREA)
Abstract
一种无损治理煤田火区的液氮系统，空气过滤器(1)、空气压缩机(2)、空气冷却器(3)、油水分离器(4)、空气干燥净化器(5)、空分塔(6)、液氮贮槽(7)、增压泵(8)通过管路顺序连接，液氮罐车(9)和地面钻孔(10)的接入端与增压泵(8)的输出端连接，底面钻孔(10)和地热井(12)位于煤田火区，地热发电设备(11)通过地热井(12)提供的高温蒸汽发电供应上述设备。本实用新型利用煤田火区产生的废弃热能进行地热发电，减少能源浪费；采用液氮防灭火技术治理煤田火，快速降温、惰化火区，且液氮来源自空气中的氮气，重新回到空气，循环利用制取液氮，既不会造成环境破坏，又实现资源的循环再利用。
A liquid nitrogen system for non-destructive treatment of coalfield fire areas, air filter (1), air compressor (2), air cooler (3), oil-water separator (4), air drying purifier (5), air separation The tower (6), the liquid nitrogen storage tank (7), and the booster pump (8) are sequentially connected through pipelines, and the access end of the liquid nitrogen tank truck (9) and the ground borehole (10) is connected to the booster pump (8) The output end is connected, the bottom surface drilling (10) and the geothermal well (12) are located in the fire area of the coal field, and the geothermal power generation equipment (11) supplies the above-mentioned equipment through the high temperature steam provided by the geothermal well (12). The utility model utilizes the waste heat energy generated in the coalfield fire area to perform geothermal power generation, reducing energy waste; the utility model adopts liquid nitrogen fire prevention and extinguishing technology to control the coalfield fire, quickly cools down and inerts the fire area, and the liquid nitrogen comes from the nitrogen in the air, and returns to the Air is recycled to produce liquid nitrogen, which will not cause environmental damage and realize the recycling of resources.
Description
技术领域technical field
本实用新型涉及一种无损治理煤田火区的液氮系统，属于煤矿安防领域。The utility model relates to a liquid nitrogen system for non-destructive treatment of fire areas in coal fields, which belongs to the field of coal mine security.
背景技术Background technique
煤炭是我国的主体能源，能源安全关系到国家稳定和发展的命脉。但中国却是受煤田火灾威胁最大的国家，美国媒体将中国的地火列为“世界5大持续性灾难”之一，自燃煤火每年烧掉的煤炭相当于美国全部能源消费的20％。20世纪60年代内蒙古的地下煤火至今仍困扰着我国，这场煤火每年约消耗2000万吨煤炭资源，超过德国全年煤炭产出量。而且，煤田火灾还会威胁采矿安全、浪费大量的热能资源、严重破坏生态环境。Coal is the main energy source in our country, and energy security is related to the lifeline of national stability and development. However, China is the country most threatened by coal field fires. The American media listed China's land fires as one of the "top 5 persistent disasters in the world". Spontaneous coal fires burn 20% of the total energy consumption of the United States every year. . The underground coal fire in Inner Mongolia in the 1960s still plagues my country. This coal fire consumes about 20 million tons of coal resources every year, which exceeds the annual coal output of Germany. Moreover, coalfield fires will threaten mining safety, waste a large amount of thermal energy resources, and seriously damage the ecological environment.
国内外主要的煤田火区灭火技术有直接剥离法、注水/浆法、注凝胶/泡沫法等。直接剥离法，就是直接用机械手段剥离、挖出火点，这种方法工程量巨大，耗时耗力，且破坏地表生态环境；灌水/浆灭火是通过钻孔灌注一定量的泥浆和水，能够起到隔绝氧气、降低煤层温度，从而达到阻止煤炭进一步氧化自燃的目的。但是因为无法准确定位火区高温点位置，且浆体扩散范围有限，因此灌水/浆效果不佳；凝胶及泡沫有一定的流动性，对采空区煤炭自燃效果较好，但成本较高，一旦泡沫破灭，防火效果会大打折扣。The main coalfield fire extinguishing technologies at home and abroad include direct stripping method, water injection/slurry method, gel/foam injection method, etc. The direct stripping method is to directly use mechanical means to strip and dig out the fire point. This method requires a huge amount of work, is time-consuming and labor-intensive, and damages the ecological environment on the surface; water/slurry fire extinguishing is to pour a certain amount of mud and water through drilling holes. It can isolate oxygen and reduce the temperature of coal seam, so as to prevent further oxidation and spontaneous combustion of coal. However, because it is impossible to accurately locate the high temperature point in the fire area, and the diffusion range of the slurry is limited, the water/slurry effect is not good; the gel and foam have certain fluidity, and the effect on the spontaneous combustion of coal in the goaf is better, but the cost is higher , once the bubble bursts, the fire prevention effect will be greatly reduced.
发明内容Contents of the invention
本实用新型的目的是提供一种无损治理煤田火区的液氮系统，在避免破坏生态环境的前提下实现对煤田火区的高效防控。The purpose of the utility model is to provide a liquid nitrogen system for non-destructive treatment of coalfield fire areas, and realize efficient prevention and control of coalfield fire areas under the premise of avoiding damage to the ecological environment.
为达到上述目的，本实用新型采用的技术方案是：For achieving the above object, the technical scheme that the utility model adopts is:
一种无损治理煤田火区的液氮系统，包括空气过滤器、空气压缩机、空气冷却器、油水分离器、空气干燥净化器、空分塔、液氮贮槽、增压泵、液氮罐车、地面钻孔、地热发电设备和地热井，所述的空气过滤器、空气压缩机、空气冷却器、油水分离器、空气干燥净化器、空分塔、液氮贮槽、增压泵通过管路顺序连接，液氮罐车和地面钻孔的接入端与增压泵的输出端连接，所述的底面钻孔位于煤田火区，所述的地热井位于煤田火区，地热发电设备通过地热井提供的高温蒸汽发电，所述的地热发电设备的电力输出端分别连接空气压缩机、空气冷却器、油水分离器、空气干燥净化器、空分塔、液氮贮槽和增压泵的电力输入端。A liquid nitrogen system for non-destructive treatment of coalfield fire areas, including air filters, air compressors, air coolers, oil-water separators, air drying purifiers, air separation towers, liquid nitrogen storage tanks, booster pumps, and liquid nitrogen tankers , ground drilling, geothermal power generation equipment and geothermal wells, the air filter, air compressor, air cooler, oil-water separator, air drying purifier, air separation tower, liquid nitrogen storage tank, booster pump through the pipe The roads are connected sequentially, the access end of the liquid nitrogen tanker and the ground borehole is connected with the output end of the booster pump, the bottom borehole is located in the coalfield fire area, the geothermal well is located in the coalfield fire area, and the geothermal power generation equipment passes through the geothermal The high-temperature steam power generation provided by the well, the power output terminals of the geothermal power generation equipment are respectively connected to the power of the air compressor, air cooler, oil-water separator, air drying purifier, air separation tower, liquid nitrogen storage tank and booster pump input.
进一步的，根据火区不同的地下地理环境和不同的火区特点，所述地面钻孔的类型包括有垂直钻孔、倾斜钻孔和曲线钻孔。Further, according to the different underground geographical environments and different characteristics of the fire area, the types of ground drilling include vertical drilling, inclined drilling and curved drilling.
进一步的，为了提高增压效果和设备之间的匹配，所述增压泵是大流量往复式低温液体泵，增压范围0～10Mpa。Further, in order to improve the boosting effect and match between equipment, the booster pump is a high-flow reciprocating cryogenic liquid pump with a boosting range of 0-10Mpa.
进一步的，为了避免防控地下火灾与地热能源提取之间的干扰，所述地热井与地面钻孔之间的距离大于50米。Further, in order to avoid interference between underground fire prevention and control and geothermal energy extraction, the distance between the geothermal well and the ground borehole is greater than 50 meters.
与现有技术相比，本实用新型提供的技术方案在干旱恶劣的煤田火区现场，应用液氮的重气沉降效应、蒸汽雾化效应、膨胀驱氧效应的防灭火特性，将大气中的空气经过压缩净化、空气分离制取液氮，直接注入地面钻孔，或者装入液氮罐车，进行固定或移动式高效降温及灭火，避免巨大的开挖剥离工程所造成的大量的人力、物力、财力消耗和生态环境的破坏；液氮扩散范围大，全淹没覆盖，相对灌浆拉沟优势显著，液氮制取过程中用水量较少，特别适合干旱或半干旱地区的灭火工程；利用煤田火区产生的废弃热能进行地热发电，减少能源浪费；采用液氮防灭火技术治理煤田火，快速降温、惰化火区，实现高效灭火的效果，且液氮来源自空气中的氮气，重新回到空气，循环利用制取液氮，既不会造成环境破坏，又实现资源的循环再利用。Compared with the prior art, the technical solution provided by the utility model applies the anti-fire and extinguishing characteristics of the heavy gas settlement effect of liquid nitrogen, steam atomization effect, and expansion and oxygen displacement effect on the site of arid and harsh coalfield fire areas to reduce the The air is compressed and purified, and air is separated to produce liquid nitrogen, which is directly injected into the ground drilling, or loaded into a liquid nitrogen tanker, for fixed or mobile efficient cooling and fire extinguishing, to avoid a large amount of manpower and material resources caused by huge excavation and stripping projects , financial consumption and damage to the ecological environment; liquid nitrogen has a large diffusion range, full submerged coverage, and has significant advantages over grouting and trenching, and the water consumption in the process of liquid nitrogen production is less, especially suitable for fire-fighting projects in arid or semi-arid areas; using coal fields The waste heat generated in the fire area is used for geothermal power generation to reduce energy waste; liquid nitrogen fire prevention and extinguishing technology is used to control coalfield fires, quickly cool down and inert the fire area, and achieve efficient fire extinguishing effects. To the air, recycling to produce liquid nitrogen, will not cause environmental damage, but also realize the recycling of resources.
附图说明Description of drawings
图1为本实用新型的结构示意图；Fig. 1 is the structural representation of the utility model;
图中：1、空气过滤器，2、空气压缩机，3、空气冷却器，4、油水分离器，5、空气干燥净化器，6、空分塔，7、液氮贮槽，8、增压泵，9、液氮罐车，10、地面钻孔，11、地热发电设备，12、地热井。In the figure: 1. Air filter, 2. Air compressor, 3. Air cooler, 4. Oil-water separator, 5. Air drying purifier, 6. Air separation tower, 7. Liquid nitrogen storage tank, 8. Booster Pressure pump, 9. Liquid nitrogen tanker, 10. Ground drilling, 11. Geothermal power generation equipment, 12. Geothermal well.
具体实施方式Detailed ways
下面结合附图对本实用新型作进一步说明。Below in conjunction with accompanying drawing, the utility model is further described.
如图1所示，一种无损治理煤田火区的液氮系统，包括空气过滤器1、空气压缩机2、空气冷却器3、油水分离器4、空气干燥净化器5、空分塔6、液氮贮槽7、增压泵8、液氮罐车9、地面钻孔10、地热发电设备11和地热井12，所述的空气过滤器1、空气压缩机2、空气冷却器3、油水分离器4、空气干燥净化器5、空分塔6、液氮贮槽7、增压泵8通过管路顺序连接，液氮罐车9和地面钻孔10的接入端与增压泵的输出端连接，所述的底面钻孔10位于煤田火区，所述的地热井12位于煤田火区，地热发电设备11通过地热井12提供的高温蒸汽发电，所述的地热发电设备11的电力输出端分别连接空气压缩机2、空气冷却器3、油水分离器4、空气干燥净化器5、空分塔6、液氮贮槽7和增压泵8的电力输入端。所述的地热发电设备11包括净化分离器、汽轮机、发电机。从地热井12取出的高温蒸汽，经过净化分离器，脱除井下带来的各种杂质，清洁的蒸汽推动汽轮机做功，并使发电机发电。As shown in Figure 1, a liquid nitrogen system for non-destructive treatment of coalfield fire areas includes an air filter 1, an air compressor 2, an air cooler 3, an oil-water separator 4, an air drying purifier 5, an air separation tower 6, Liquid nitrogen storage tank 7, booster pump 8, liquid nitrogen tank truck 9, ground drilling 10, geothermal power generation equipment 11 and geothermal well 12, the air filter 1, air compressor 2, air cooler 3, oil-water separation 4, air drying purifier 5, air separation tower 6, liquid nitrogen storage tank 7, and booster pump 8 are sequentially connected through pipelines, and the access end of the liquid nitrogen tank car 9 and the ground drilling 10 is connected with the output end of the booster pump connection, the bottom borehole 10 is located in the coalfield fire area, the geothermal well 12 is located in the coal field fire area, the geothermal power generation equipment 11 generates electricity through the high-temperature steam provided by the geothermal well 12, and the power output end of the geothermal power generation equipment 11 Connect the power input ends of the air compressor 2, the air cooler 3, the oil-water separator 4, the air drying purifier 5, the air separation tower 6, the liquid nitrogen storage tank 7 and the booster pump 8 respectively. The geothermal power generation equipment 11 includes a purification separator, a steam turbine, and a generator. The high-temperature steam taken out from the geothermal well 12 passes through the purification separator to remove various impurities brought down the well, and the clean steam drives the steam turbine to do work and the generator to generate electricity.
进一步的，根据火区不同的地下地理环境和不同的火区特点，所述地面钻孔14的类型包括有垂直钻孔、倾斜钻孔和曲线钻孔。Further, according to different underground geographical environments and different characteristics of the fire area, the types of the ground boreholes 14 include vertical boreholes, inclined boreholes and curved boreholes.
进一步的，为了提高增压效果和设备之间的匹配，所述增压泵9是大流量往复式低温液体泵，增压范围0～10Mpa。Further, in order to improve the boosting effect and match between equipment, the booster pump 9 is a high-flow reciprocating cryogenic liquid pump with a boosting range of 0-10Mpa.
进一步的，为了避免防控地下火灾与地热能源提取之间的干扰，所述地热井12与地面钻孔10之间的距离大于50米。Further, in order to avoid interference between prevention and control of underground fires and extraction of geothermal energy, the distance between the geothermal well 12 and the ground borehole 10 is greater than 50 meters.
一种无损治理煤田火区的方法，包括以下步骤：A method for non-destructively controlling coalfield fire areas, comprising the following steps:
A.从地热井12取出的高温蒸汽驱动地热发电设备11，为空气压缩机2、空气冷却器3、油水分离器4、空气干燥净化器5、空分塔6、液氮贮槽7和增压泵8供应电能；A. The high-temperature steam taken out from the geothermal well 12 drives the geothermal power generation equipment 11, which is an air compressor 2, an air cooler 3, an oil-water separator 4, an air drying purifier 5, an air separation tower 6, a liquid nitrogen storage tank 7 and a booster The pressure pump 8 supplies electric energy;
B.大气中的空气经空气过滤器1清除灰尘和机械杂质，然后进入空气压缩机2压缩至所需压力，送入空气冷却器3降低空气温度，再进入油水分离器4及空气干燥净化器5，除去空气中的水分、二氧化碳、乙炔及其他碳氢化合物，完成空气的压缩和净化；B. The air in the atmosphere passes through the air filter 1 to remove dust and mechanical impurities, then enters the air compressor 2 to compress to the required pressure, sends it to the air cooler 3 to reduce the air temperature, and then enters the oil-water separator 4 and the air drying purifier 5. Remove moisture, carbon dioxide, acetylene and other hydrocarbons in the air, and complete the compression and purification of the air;
C.净化后的空气进入空分塔6，完成空气分离，得到液氮，制取的液氮通过液氮输送管贮存在液氮贮槽7中；C. the purified air enters the air separation tower 6 to complete the air separation to obtain liquid nitrogen, and the prepared liquid nitrogen is stored in the liquid nitrogen storage tank 7 through the liquid nitrogen delivery pipe;
D.液氮贮槽7中的液氮经增压泵8增压后通过低温绝热管输送到指定位置后，通过注液氮管注入煤田火区的地面钻孔10中；D. After the liquid nitrogen in the liquid nitrogen storage tank 7 is pressurized by the booster pump 8, it is transported to the designated position through the low-temperature heat-insulating pipe, and then injected into the ground borehole 10 in the coalfield fire area through the liquid nitrogen injection pipe;
E.多余的液氮通过低温绝热管装入液氮罐车9，运送到煤田使用地点由压送设备注入火区。E. The excess liquid nitrogen is loaded into the liquid nitrogen tanker 9 through the low-temperature heat-insulating pipe, and transported to the coalfield use site and injected into the fire area by the pressure delivery equipment.
本实用新型提出的设计方案在恶劣的煤田火区现场，将大气中的空气经过压缩净化、空气分离制取液氮，直接注入地面钻孔，或者装入液氮罐车，进行固定或移动式高效降温及灭火，避免巨大的开挖剥离工程所造成的大量的人力、物力、财力消耗和生态环境的破坏；液氮制取过程中用水量较少，特别适合干旱或半干旱地区的灭火工程；利用煤田火区产生的废弃热能进行地热发电，减少能源浪费；采用液氮防灭火技术治理煤田火，快速降温、惰化火区，实现高效灭火的效果，且液氮来源自空气中的氮气，重新回到空气，循环利用制取液氮，既不会造成环境破坏，又实现资源的循环再利用。The design scheme proposed by the utility model is to compress and purify the air in the atmosphere, separate the air to produce liquid nitrogen, and directly inject it into the ground to drill holes, or put it into a liquid nitrogen tanker, and carry out fixed or mobile high-efficiency Cooling and extinguishing fires, avoiding a large amount of manpower, material and financial resources consumption and damage to the ecological environment caused by huge excavation and stripping projects; the water consumption in the process of liquid nitrogen production is less, especially suitable for fire extinguishing projects in arid or semi-arid areas; Utilize the waste heat energy generated in the coalfield fire area for geothermal power generation to reduce energy waste; use liquid nitrogen fire prevention and extinguishing technology to control coalfield fires, quickly cool down and inert the fire area, and achieve efficient fire extinguishing effects, and the liquid nitrogen comes from nitrogen in the air. Return to the air and recycle to produce liquid nitrogen, which will not cause environmental damage and realize the recycling of resources.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912585A (en) * | 2015-05-21 | 2015-09-16 | 中国矿业大学 | Liquid nitrogen system and method for nondestructively governing fire area in coal field |
| CN110307129A (en) * | 2019-07-05 | 2019-10-08 | 南京工程学院 | Geothermal power generation evaluation method for geothermal energy assisted coal-fired complementary power generation system |
| WO2022011934A1 (en) * | 2020-07-16 | 2022-01-20 | 中国矿业大学 | Mobile liquid nitrogen fire extinguishing system for comprehensive pipe gallery and fire extinguishing method therefor |
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2015
- 2015-05-21 CN CN201520333257.9U patent/CN204783094U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912585A (en) * | 2015-05-21 | 2015-09-16 | 中国矿业大学 | Liquid nitrogen system and method for nondestructively governing fire area in coal field |
| CN110307129A (en) * | 2019-07-05 | 2019-10-08 | 南京工程学院 | Geothermal power generation evaluation method for geothermal energy assisted coal-fired complementary power generation system |
| CN110307129B (en) * | 2019-07-05 | 2020-08-04 | 南京工程学院 | Evaluation method of geothermal energy generation capacity of geothermal energy-assisted coal-fired complementary power generation system |
| WO2022011934A1 (en) * | 2020-07-16 | 2022-01-20 | 中国矿业大学 | Mobile liquid nitrogen fire extinguishing system for comprehensive pipe gallery and fire extinguishing method therefor |
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