CN105484787A - Coal-mine liquid-nitrogen fire-prevention cooling system and method - Google Patents
Coal-mine liquid-nitrogen fire-prevention cooling system and method Download PDFInfo
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- CN105484787A CN105484787A CN201511017235.2A CN201511017235A CN105484787A CN 105484787 A CN105484787 A CN 105484787A CN 201511017235 A CN201511017235 A CN 201511017235A CN 105484787 A CN105484787 A CN 105484787A
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- Prior art keywords
- liquid nitrogen
- nitrogen
- liquid
- supervisor
- cooling system
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 472
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 244
- 238000001816 cooling Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 11
- 239000007788 liquid Substances 0.000 claims abstract description 188
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 26
- 230000002265 prevention Effects 0.000 claims abstract description 26
- 238000009834 vaporization Methods 0.000 claims description 38
- 230000008016 vaporization Effects 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 32
- 239000006200 vaporizer Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 10
- 230000006641 stabilisation Effects 0.000 claims description 8
- 238000011105 stabilization Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007261 regionalization Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F3/00—Cooling or drying of air
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
Abstract
The invention discloses a coal-mine liquid-nitrogen fire-prevention cooling system. The coal-mine liquid-nitrogen fire-prevention cooling system comprises a liquid-nitrogen tank car, wherein the liquid-nitrogen tank car is connected with a main liquid-nitrogen delivery pipe, the main liquid-nitrogen delivery pipe is connected with a main direct liquid-nitrogen injection pipe and a liquid-nitrogen gasifying and cooling device respectively, the main direct liquid-nitrogen injection pipe is used for injecting liquid nitrogen into a high-temperature oxidation area, the liquid-nitrogen gasifying and cooling device is used for gasifying liquid nitrogen into gaseous nitrogen, and a gaseous nitrogen pipe for filling the gaseous nitrogen into the high-temperature oxidation area is connected onto the liquid-nitrogen gasifying and cooling device. The invention further discloses a coal-mine liquid-nitrogen fire-prevention cooling method adopting the coal-mine liquid-nitrogen fire-prevention cooling system to perform fire-prevention cooling. The coal-mine liquid-nitrogen fire-prevention cooling method and the coal-mine liquid-nitrogen fire-prevention cooling system achieve dual fire extinguishment effects by integrating the two fire prevention and fire extinguishment modes of liquid-nitrogen injection and gaseous nitrogen injection.
Description
Technical field
The present invention relates to underground coal mine falling temperature technique, particularly relate to a kind of colliery liquid nitrogen cooling fire prevention system and method.
Background technology
Along with the coal mine depth of excavation constantly increases, underground thermal pollution problem manifests gradually, according to field measurement, under work plane, corner and return observed temperature are generally 31 DEG C-34 DEG C, and calculate when the face degree of depth reaches underground 800m accordingly, work plane temperature even can reach 37 DEG C, and underground thermal pollution adds the danger of spontaneous combustion in goaf, has had a strong impact on the safety in production of mine and the health of staff.
In order to prevent and treat mine fire, generally adopt nitrogen, slurry and water as fire extinguishing medium at present, wherein liquid nitrogen has the features such as volume is little, easy storing, liquid nitrogen is filled in the high-temperature oxydation district in mine, reduction zoneofoxidation temperature, displacement rapidly can be reached and go out the multiple effect such as toxic and harmful, inerting high-temperature oxydation district.But liquid nitrogen fire extinguishing device mostly is single fire-fighting pipeline at present, can not utilize the function of liquid nitrogen cooling and fire extinguishing completely.
Summary of the invention
The object of the invention is to overcome defect of the prior art, provides a kind of colliery liquid nitrogen fire prevention cooling system and method.
The invention provides a kind of colliery liquid nitrogen fire prevention cooling system, comprise liquid nitrogen tank car, described liquid nitrogen tank car is connected with liquid nitrogen conveying supervisor, described liquid nitrogen conveying supervisor connects liquid nitrogen respectively and directly notes supervisor and liquid nitrogen vaporization heat sink, described liquid nitrogen directly notes supervisor for liquid nitrogen is filled into high-temperature oxydation district, described liquid nitrogen vaporization heat sink is used for liquid nitrogen vaporization to become gas nitrogen, and described liquid nitrogen vaporization heat sink is connected with the gas nitrogen pipe for gas nitrogen being filled into described high-temperature oxydation district.
Further, described colliery liquid nitrogen fire prevention cooling system also comprises slurrying pond, the water inlet in described slurrying pond is connected with water pipe, and described water pipe is wrapped in described liquid nitrogen and directly notes on supervisor, described slurrying pond is connected with the Grouting Pipe for slurry being circulated into described high-temperature oxydation district.
Further, described liquid nitrogen vaporization heat sink comprises for liquid nitrogen vaporization being become the liquid nitrogen vaporizer of gas nitrogen and being used for accelerating the fan of interchange of heat between described liquid nitrogen vaporizer and air.
Further, described fan connects air line, and described air line is used for providing power for described fan.
Further, described liquid nitrogen vaporizer comprises fin.
Further, described liquid nitrogen tank car and described liquid nitrogen are disposed with booster pump, the first pressure-control valve and the first pressure meter between carrying and being responsible for.
Further, voltage stabilization and current stabilization pump, the second pressure-control valve and the second pressure meter is disposed with between described liquid nitrogen conveying supervisor and described liquid nitrogen vaporizer.
Present invention also offers a kind of above-mentioned colliery liquid nitrogen fire prevention cooling system that uses to prevent fires the colliery liquid nitrogen fire prevention cool-down method of cooling, comprise the following steps:
Step 1, the liquid nitrogen in described liquid nitrogen tank car is transported to described liquid nitrogen conveying supervisor;
Step 2, by described liquid nitrogen conveying supervisor, liquid nitrogen is transported to liquid nitrogen respectively and directly notes supervisor and liquid nitrogen vaporization heat sink;
Step 3, described liquid nitrogen are directly noted supervisor, through surface drilling, liquid nitrogen are filled into high-temperature oxydation district; And
Liquid nitrogen vaporization is become gas nitrogen by step 4, described liquid nitrogen vaporization heat sink, and gas nitrogen is filled into described high-temperature oxydation district by the described gas nitrogen pipe then by being connected with described liquid nitrogen vaporizer.
Further, also comprise step 5, directly noted supervisor's cooling by described liquid nitrogen and be wrapped in water in the water pipe that described liquid nitrogen directly notes on supervisor; And step 6, described water pipe by cooling after water be transported in slurrying pond, slurry is filled into described high-temperature oxydation district by Grouting Pipe by described slurrying pond.
Further, the described liquid nitrogen vaporization heat sink in described step 2 comprises liquid nitrogen vaporizer and fan, by liquid nitrogen vaporizer, liquid nitrogen vaporization is become gas nitrogen, accelerates the interchange of heat between described liquid nitrogen vaporizer and air by fan.
The present invention, by integrated fluid injection nitrogen, these two kinds of fireproof fire-extinguishing modes of gas injection nitrogen, achieves dual extinguishing effect.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation according to a kind of colliery of the present invention liquid nitrogen fire prevention cooling system;
Fig. 2 is the course of work flow chart according to a kind of colliery of the present invention liquid nitrogen fire prevention cooling system.
In figure:
1, liquid nitrogen tank car; 21, the first snap joint; 22, the second snap joint; 23, the 3rd snap joint; 31, switching control pilot; 32, the first pressure-control valve; 33, the second pressure-control valve; 41, liquid nitrogen conveying supervisor; 42, water pipe; 43, liquid nitrogen directly notes pipe; 44, Grouting Pipe; 45, gas nitrogen pipe; 51, supply channel; 52, air line; 61, booster pump; 62, voltage stabilization and current stabilization pump; 63, kinetic pump; 71, the first pressure meter; 72, the second pressure meter; 73, the 3rd pressure meter; 74, the 4th pressure meter; 8, fan; 9, liquid nitrogen vaporizer; 10, slurrying pond.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention; technical scheme in the embodiment of the present invention is clearly and completely described; obviously; described embodiment is only a part of embodiment of the present invention; based on the inventive concept in the present invention; the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
As shown in Figure 1, one embodiment of the invention provides a kind of colliery liquid nitrogen fire prevention cooling system, comprise liquid nitrogen tank car 1, liquid nitrogen tank car 1 is connected with liquid nitrogen conveying supervisor 41, liquid nitrogen conveying supervisor 41 connects liquid nitrogen respectively and directly notes supervisor 43 and liquid nitrogen vaporization heat sink, liquid nitrogen directly notes supervisor 43 for liquid nitrogen is filled into high-temperature oxydation district, and liquid nitrogen vaporization is become gas nitrogen by liquid nitrogen vaporization heat sink, and liquid nitrogen vaporization heat sink is connected with the gas nitrogen pipe 45 for gas nitrogen being filled into high-temperature oxydation district.
Liquid nitrogen tank car 1 for storing and transporting liquid nitrogen, and liquid nitrogen tank car 1 is provided with the first snap joint 21, can supervisor 41 be carried to be connected with liquid nitrogen fast by the first snap joint 21 liquid nitrogen tank car 1.Liquid nitrogen is transported to liquid nitrogen and directly notes supervisor 43 and liquid nitrogen vaporization heat sink by liquid nitrogen conveying supervisor 41 respectively, and liquid nitrogen is directly noted supervisor 43, through surface drilling, liquid nitrogen is filled into high-temperature oxydation district, such as goaf.Liquid nitrogen vaporization is become gas nitrogen by liquid nitrogen vaporization heat sink, and by gas nitrogen pipe 45, gas nitrogen is filled into high-temperature oxydation district.Native system utilizes the gentle nitrogen of liquid nitrogen to put out a fire simultaneously, achieves dual extinguishing effect.
In a preferred embodiment, described colliery liquid nitrogen fire prevention cooling system also comprises slurrying pond 10, the water inlet in slurrying pond 10 is connected with water pipe 42, and water pipe 42 is wrapped in liquid nitrogen and directly notes on supervisor 43, slurrying pond 10 is connected with the Grouting Pipe 44 for slurry being circulated into high-temperature oxydation district.Water pipe 42 is connected with the supply channel 51 existed in mine by the second snap joint 22, water transport is passed to slurrying pond 10.Grouting Pipe 44 is arranged by kinetic pump 63, kinetic pump is used for the low temperature slurries made in slurrying pond 10 to be pumped into high-temperature oxydation district.Directly note on supervisor 43 by water pipe 42 being wrapped in liquid nitrogen, liquid nitrogen directly notes low temperature liquid nitrogen in supervisor 43 can water in cooling water pipe 42, thus reduce the temperature of the slurry in slurrying pond 10, improves the fireproof fire-extinguishing performance of slurry.
In a preferred embodiment, liquid nitrogen vaporization heat sink comprises for liquid nitrogen vaporization being become the liquid nitrogen vaporizer 9 of gas nitrogen and being used for the fan 8 of the interchange of heat accelerated between liquid nitrogen vaporizer 9 and air.Liquid nitrogen vaporization heat sink can be arranged on Climatic regionalization district, such as working space, and in liquid nitrogen vaporizer 9, the hot air in liquid nitrogen and Climatic regionalization district carries out interchange of heat, and lower the temperature to hot air, meanwhile, liquid gas is nitrided into gas nitrogen.
Fan 8 connects air line 52, and air line 52 is for providing power for fan 8.Wherein, fan 8 is connected with air line 52 by the 3rd snap joint 23, and air line 52 exists in mine, utilizes air line 52 to provide power to make full use of existing resource to fan 8, thus energy conservation.Liquid nitrogen vaporizer 9 comprises fin, and fin increases the heat exchange area between nitrogen vaporizer 9 and air.Preferably, liquid nitrogen vaporizer 9 adopts aluminium alloys to make, and aluminium alloys radiating effect is better.
Liquid nitrogen tank car 1 and liquid nitrogen are carried between supervisor 41 and are disposed with booster pump 61, the first pressure-control valve 32 and the first pressure meter 71.First pressure meter 71 preferably digital display type, booster pump 61 is low temperature increase pump.Liquid nitrogen flows out after booster pump 61 supercharging from liquid nitrogen tank car 1, utilizes the first pressure-control valve 32 and the first pressure meter 71 to control liquid nitrogen output quantity and liquid nitrogen output pressure.Also be provided with switching control pilot 31 between first snap joint 21 and booster pump 61, switching control pilot 31 flows to liquid nitrogen conveying supervisor 41 for controlling liquid nitrogen from liquid nitrogen tank car 1.
Be disposed with voltage stabilization and current stabilization pump 62, second pressure-control valve 33 and the second pressure meter 72 between liquid nitrogen conveying supervisor 41 and liquid nitrogen vaporizer 9, therefore native system can the stable liquid nitrogen of output pressure.
Liquid nitrogen is directly noted on pipe 43 and gas nitrogen pipe 45 and is respectively arranged with the 4th pressure meter 74 and the 3rd pressure meter 73.The pressure of the gentle nitrogen of liquid nitrogen to the perfusion of high-temperature oxydation district directly can be read by the 4th pressure meter 74 and the 3rd pressure meter 73.
With reference to Fig. 2, one embodiment of the invention provide a kind of above-mentioned colliery liquid nitrogen fire prevention cooling system that uses and to prevent fires the colliery liquid nitrogen fire prevention cool-down method of cooling, comprise the following steps:
Step S01, the liquid nitrogen in liquid nitrogen tank car 1 is transported to liquid nitrogen conveying supervisor 41;
Step S02, liquid nitrogen is transported to liquid nitrogen respectively directly notes supervisor 43 and liquid nitrogen vaporization heat sink by liquid nitrogen conveying supervisor 41;
Step S03, liquid nitrogen are directly noted supervisor 43, through surface drilling, liquid nitrogen are filled into high-temperature oxydation district; And
Liquid nitrogen vaporization is become gas nitrogen by step S04, liquid nitrogen vaporization heat sink, and gas nitrogen is filled into high-temperature oxydation district by the gas nitrogen pipe 45 then by being connected with liquid nitrogen vaporizer 9.
In a preferred embodiment, described method is also comprised step S05, is directly noted supervisor 43 cooling be wrapped in water in the water pipe 42 that liquid nitrogen directly notes on supervisor 43 by described liquid nitrogen; And step S06, water pipe 42 by cooling after water be transported in slurrying pond 10, slurry is filled into high-temperature oxydation district by Grouting Pipe 44 by slurrying pond 10.
In a preferred embodiment, the liquid nitrogen vaporization heat sink in step S02 comprises liquid nitrogen vaporizer 9 and fan 8, by liquid nitrogen vaporizer 9, liquid nitrogen vaporization is become gas nitrogen, accelerates the interchange of heat between described liquid nitrogen vaporizer 9 and air by fan 8.The embody rule of this liquid nitrogen vaporization heat sink and advantage detailed earlier herein, do not repeat them here.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a colliery liquid nitrogen fire prevention cooling system, it is characterized in that: comprise liquid nitrogen tank car (1), described liquid nitrogen tank car (1) is connected with liquid nitrogen conveying supervisor (41), described liquid nitrogen conveying supervisor (41) connects liquid nitrogen respectively and directly notes supervisor (43) and liquid nitrogen vaporization heat sink, described liquid nitrogen directly notes supervisor (43) for liquid nitrogen is filled into high-temperature oxydation district, described liquid nitrogen vaporization heat sink is used for liquid nitrogen vaporization to become gas nitrogen, and the gas nitrogen pipe (45) described liquid nitrogen vaporization heat sink is connected with for gas nitrogen being filled into described high-temperature oxydation district.
2. colliery according to claim 1 liquid nitrogen fire prevention cooling system, it is characterized in that: described colliery liquid nitrogen fire prevention cooling system also comprises slurrying pond (10), the water inlet of described slurrying pond (10) is connected with water pipe (42), described water pipe (42) is wrapped in described liquid nitrogen and directly notes on supervisor (43), described slurrying pond (10) is connected with the Grouting Pipe (44) for slurry being circulated into described high-temperature oxydation district.
3. colliery according to claim 1 and 2 liquid nitrogen fire prevention cooling system, is characterized in that: described liquid nitrogen vaporization heat sink comprises for liquid nitrogen vaporization being become the liquid nitrogen vaporizer of gas nitrogen (9) and the fan (8) for accelerating interchange of heat between described liquid nitrogen vaporizer (9) and air.
4. colliery according to claim 3 liquid nitrogen fire prevention cooling system, it is characterized in that: described fan (8) connects air line (52), and described air line (52) is for providing power for described fan (8).
5. colliery according to claim 4 liquid nitrogen fire prevention cooling system, is characterized in that: described liquid nitrogen vaporizer (9) comprises fin.
6. colliery according to claim 5 liquid nitrogen fire prevention cooling system, is characterized in that: described liquid nitrogen tank car (1) and described liquid nitrogen are carried to be responsible between (41) and be disposed with booster pump (61), the first pressure-control valve (32) and the first pressure meter (71).
7. colliery according to claim 6 liquid nitrogen fire prevention cooling system, is characterized in that: be disposed with voltage stabilization and current stabilization pump (62), the second pressure-control valve (33) and the second pressure meter (72) between described liquid nitrogen conveying supervisor (41) and described liquid nitrogen vaporizer (9).
8. use the fire prevention of the colliery liquid nitrogen described in claim 1 cooling system to prevent fires the colliery liquid nitrogen fire prevention cool-down method of cooling, it is characterized in that: comprise the following steps:
Step S01, the liquid nitrogen in described liquid nitrogen tank car (1) is transported to described liquid nitrogen conveying supervisor (41);
Step S02, by described liquid nitrogen conveying supervisor (41), liquid nitrogen is transported to described liquid nitrogen respectively and directly notes supervisor (43) and described liquid nitrogen vaporization heat sink;
Step S03, described liquid nitrogen are directly noted supervisor (43), through surface drilling, liquid nitrogen are filled into high-temperature oxydation district; And
Liquid nitrogen vaporization is become gas nitrogen by step S04, described liquid nitrogen vaporization heat sink, and gas nitrogen is filled into described high-temperature oxydation district by the described gas nitrogen pipe (45) then by being connected with described liquid nitrogen vaporizer (9).
9. colliery according to claim 8 liquid nitrogen fire prevention cool-down method, is characterized in that: also comprise step S05, directly noted supervisor (43) cool the water be wrapped in water pipe (42) that described liquid nitrogen directly notes on supervisor (43) by described liquid nitrogen;
And step S06, described water pipe (42) by cooling after water be transported in slurrying pond (10), slurry is filled into described high-temperature oxydation district by Grouting Pipe (44) by described slurrying pond (10).
10. colliery according to claim 9 liquid nitrogen fire prevention cool-down method, it is characterized in that: the described liquid nitrogen vaporization heat sink in described step 2 comprises liquid nitrogen vaporizer (9) and fan (8), by described liquid nitrogen vaporizer (9), liquid nitrogen vaporization is become gas nitrogen, accelerate the interchange of heat between described liquid nitrogen vaporizer (9) and air by described fan (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511017235.2A CN105484787A (en) | 2015-12-29 | 2015-12-29 | Coal-mine liquid-nitrogen fire-prevention cooling system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511017235.2A CN105484787A (en) | 2015-12-29 | 2015-12-29 | Coal-mine liquid-nitrogen fire-prevention cooling system and method |
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| CN105484787A true CN105484787A (en) | 2016-04-13 |
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| CN201511017235.2A Pending CN105484787A (en) | 2015-12-29 | 2015-12-29 | Coal-mine liquid-nitrogen fire-prevention cooling system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222999A (en) * | 2018-01-26 | 2018-06-29 | 宁夏德大气体开发科技有限公司 | A kind of liquid carbon dioxide cooling fire extinguishing system |
| CN108843369A (en) * | 2018-05-24 | 2018-11-20 | 山东科技大学 | A kind of mining liquid CO2The straight injection system in ground and method |
| CN109236346A (en) * | 2018-08-09 | 2019-01-18 | 煤科集团沈阳研究院有限公司 | Coal mine down-hole refrigeration cooling and low temperature slip casting fireproof fire-extinguishing control system |
| CN110094207A (en) * | 2019-05-23 | 2019-08-06 | 王海霖 | A kind of artificial stratum freezing system and method for low temperature nitrogen circularly cooling |
| CN116427988A (en) * | 2023-05-31 | 2023-07-14 | 中煤科工集团重庆研究院有限公司 | Gas mine surface drilling fire extinguishing method based on liquid nitrogen filling |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108222999A (en) * | 2018-01-26 | 2018-06-29 | 宁夏德大气体开发科技有限公司 | A kind of liquid carbon dioxide cooling fire extinguishing system |
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| CN109236346A (en) * | 2018-08-09 | 2019-01-18 | 煤科集团沈阳研究院有限公司 | Coal mine down-hole refrigeration cooling and low temperature slip casting fireproof fire-extinguishing control system |
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| CN110094207B (en) * | 2019-05-23 | 2020-07-17 | 王海霖 | Artificial stratum freezing system and method for low-temperature nitrogen circulating refrigeration |
| CN116427988A (en) * | 2023-05-31 | 2023-07-14 | 中煤科工集团重庆研究院有限公司 | Gas mine surface drilling fire extinguishing method based on liquid nitrogen filling |
| CN116427988B (en) * | 2023-05-31 | 2024-01-23 | 中煤科工集团重庆研究院有限公司 | Gas mine surface drilling fire extinguishing method based on liquid nitrogen filling |
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Application publication date: 20160413 |