CN115163166A - Deep well mining relay air supply refrigeration system with cyclone separator - Google Patents
Deep well mining relay air supply refrigeration system with cyclone separator Download PDFInfo
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- CN115163166A CN115163166A CN202210826724.6A CN202210826724A CN115163166A CN 115163166 A CN115163166 A CN 115163166A CN 202210826724 A CN202210826724 A CN 202210826724A CN 115163166 A CN115163166 A CN 115163166A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 33
- 238000005065 mining Methods 0.000 title claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000005641 tunneling Effects 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 241000668854 Howardia biclavis Species 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
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Classifications
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- 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
- E21F5/20—Drawing-off or depositing dust
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- 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 provides a deep well mining relay air supply refrigeration system with a cyclone separator, which comprises an air cooler, a fan, the cyclone separator, an air wall and an air inlet and outlet pipeline; the system is arranged in a quarry tunnel near a stope or a driving working face in a deep well, a small-sized closed air reservoir is formed in the space of the quarry tunnel by using an air wall, non-fresh air introduced into a tunnel in the middle of a mine enters a cyclone separator for filtering, and air for discharging particles is introduced into the closed air reservoir; the fan sucks clean air in the wind storehouse and leads the clean air into the air cooler; and air is subjected to heat exchange with the refrigerant in the air cooler and then is conveyed to the working surface, so that the temperature of the working surface is reduced. The tunnel blocking relay air supply mode fully utilizes the space of the deep well, and the cyclone separator is arranged, so that the damage of particles in the air to the refrigeration equipment is reduced.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a relay air supply refrigeration system for deep well mining, which is provided with a cyclone separator.
Background
With the continuous development and utilization of mineral resources, shallow layer mine resources are continuously consumed, so that the mining scale is continuously enlarged, and the mining depth of the mine is increased year by year. Hitherto, the metal mine resource exploitation in China has been shifted to deep parts, and along with the continuous increase of the exploitation depth and the improvement of the exploitation mechanization degree, the mine thermal damage is increasingly serious, which will have serious influence on safe and efficient production, and becomes an important scientific and technological problem to be solved urgently in the metal mine industry. The underground environment of a deep mine is complex, the ventilation of a working face is extremely poor, the problem of heat damage is prominent, the working efficiency of the mine is seriously influenced, and even the physical health of workers can be threatened. Effective ventilation and refrigeration of mines become one of the current technical difficulties in deep mining. The "metallic and non-metallic mine safety regulations" of China stipulate: the air temperature of the working face of the production mine is not more than 26 ℃, the air temperature of the electromechanical equipment chamber is not more than 30 ℃, and the operation must be stopped when the air temperatures of the two working places are more than 30 ℃ and 34 ℃. Taking a gold mine as an example, the existing deep well operation area (the depth is more than 500 m) mainly takes ventilation cooling as main, the underground temperature is high (29 ℃), the relative humidity is high (more than 96%), the cooling effect is poor, and the thermal environment is very severe. In order to ensure the safe production of mines and the health of workers, effective measures must be taken pertinently to reduce the environmental temperature and control the high-temperature heat damage.
Deep well cooling technology adopted at home and abroad comprises: arranging a ventilation system and cooling clothes for workers, and additionally arranging a refrigerator on the ground or in the pit. There are problems that: the ventilation system has a worse effect with the increase of the operation depth; the cooling clothes cost of workers is high, and the operation process is inconvenient; the underground refrigerator has the problems of difficult heat extraction, poor cooling effect, high operating cost and the like caused by taking air as a heat dissipation medium.
The mode of passively strengthening heat exchange is to strictly prevent the fluid vibration induction in the heat exchanger from being changed into effective utilization of vibration, so that the convective heat transfer coefficient of the transmission element at low flow speed is greatly improved, dirt on the surface of the heat transfer element is restrained by vibration, the thermal resistance of the dirt is reduced, and the composite strengthened heat transfer is realized.
The rapid development of heat exchangers and related technologies over the last several decades has led to encouraging progress, however, some long-term unsolved problems have become more prominent. The fluid induced vibration and the heat transfer surface area dirt in the heat exchanger are the outstanding problems recognized in the world and urgently solved. The fluid-induced vibration can cause severe noise and damage to the heat transfer tube bundle, and fouling of the heat transfer tube bundle surface can result in significant energy and resource losses. It is not possible to completely prevent the tube bundle from vibrating within the heat exchanger, and it is not always effective to prevent the vibration by increasing the strength of the heat transfer tube bundle to avoid damage and noise of the tube bundle. The mode of passive heat transfer enhancement is to utilize the vibration of the fluid-induced heat transfer tube bundle to realize the heat transfer enhancement, and through the effective utilization of the vibration, the heat transfer enhancement can be realized while inhibiting the heat transfer surface scale deposit, the thermal resistance of the scale is reduced, and the composite heat transfer enhancement is realized.
Therefore, the invention provides a new deep metal mine stope refrigerating system aiming at the defects of the existing deep well underground refrigerating system, and simultaneously utilizes underground air and underground space to establish a refrigerating system suitable for a deep well, so that the stope cooling can be realized, the underground waste space is utilized, and the deep well deep metal mine stope refrigerating system has the advantages of compact equipment, good safety and convenience in overhauling and maintenance and is very suitable for deep well operation.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the following technical scheme:
a relay air supply and refrigeration system provided with a cyclone separator for deep well mining comprises an air cooler, a fan, the cyclone separator, an air wall, an air inlet pipeline and an air outlet pipeline, wherein the system is arranged in a quarry tunnel close to a stope or a driving working face in a deep well, the air wall is utilized to enable the space of the quarry tunnel to form a closed small air reservoir, non-fresh air introduced into a tunnel in the middle of a mine is enabled to enter the cyclone separator for filtration, and air for discharging particulate matters enters the closed air reservoir. The fan sucks clean air in the wind storehouse and introduces the clean air into the air cooler; after the air exchanges heat with the refrigerant in the air cooler, the air is sent to a nearby stope or a tunneling working face through a fan and a pipeline, and therefore the temperature of the working face is reduced.
Preferably, the air wall and the space of the roadway of the prospect area form a small air reservoir which is used as an air inlet source of the air cooler.
Preferably, the air cooler is arranged in a small-sized air warehouse formed by an air wall and a roadway space of the prospecting mine.
Preferably, the air cooler and the fan are uniformly distributed in the air wall and a small air reservoir which enables the roadway space of the prospecting mine to form a closed structure.
Preferably, the air cooler adopts a fin-tube heat exchanger.
Preferably, the fan is an axial flow fan.
Preferably, each refrigeration system individually provides cooling for one stope. The air outlet pipeline between the roadway of the prospecting mine pit and the stope or the tunneling working face is shorter, and the purpose is to refine the pipeline. The refrigerating system is placed in an exploratory circle roadway which is about 50-100 meters away from a stope or a driving working face. When the stope is changed, the cooling system and the pipeline corresponding to the stope can be quickly disassembled and reinstalled, so that the flexibility of the system is improved.
Preferably, a temperature sensor is arranged underground and used for detecting the underground environment temperature, a controller is arranged at the air cooler, and the controller performs reasonable power control according to the temperature of the temperature sensor.
Preferably, the air wall material for the mine is selected from light-weight and good-sealing-performance air wall materials for the mine.
Preferably, the cyclone separator adopts a lower air inlet mode, and due to the fact that the humidity of the introduced air is high, the lower air inlet can utilize the lower space of the equipment to pre-separate liquid drops with the diameter larger than 300-500 mu m so as to reduce the load of a cyclone part.
Preferably, cyclone arranges in being close to the wind wall department, and exhaust particulate matter sends into dust collecting device through the pipeline, and dust collecting device places in the wind wall outside, also convenient clearance when reducing internal environment pollution.
The invention has the following advantages:
1) The invention provides a novel refrigeration system for deep well mining, which makes full use of underground space, arranges the refrigeration system in a waste exploratory circle roadway, has high refrigeration power, does not need to consider the influence of the volume of an air cooler and a fan on the deep well mining, and is very suitable for the deep well operation.
2) The tunnel blocking relay air supply mode adopted by the invention does not need to be designed in a moisture-proof way, and only needs to be provided with the cyclone separator, the fan and the air cooler, thereby realizing the technical effects of compact equipment, simple structure, convenient control and high refrigeration efficiency.
3) The invention utilizes the non-fresh air of the middle roadway in the well, does not need to introduce fresh air, and has flexible pipeline arrangement.
4) The refrigerating systems are placed in the stope roadway close to the stope, each refrigerating system independently supplies cold for one stope, and the pipeline sent to the working face of the stope is short, so that the pipeline is refined. When the stope is changed, the refrigeration system and the pipeline corresponding to the stope can be quickly disassembled and reinstalled, and the equipment of the stope which does not need refrigeration can be quickly transferred to a newly excavated stope along with the change of the mining stope in the face of complex mine internal environment, so that the flexibility of the system is improved.
5) The cyclone separator is used for filtering introduced non-fresh air, so that particles in the air are effectively and greatly reduced, the damage to mechanical equipment is fundamentally reduced, and the service life of a refrigeration system is prolonged.
Drawings
FIG. 1 is a schematic diagram of the inventive structure of a refrigeration system;
FIG. 2 is a schematic structural diagram of a closed space formed by a roadway and a wind wall of the prospecting mine circle;
FIG. 3 is a top view of the enclosure formed by the mine exploring lane and the air wall of the present invention;
in the figure: 1. air cooler, 2, fan, 3, wind wall, 4, condenser tube, 5, air inlet pipeline, 6, air outlet pipeline, 7, cyclone.
Detailed Description
The invention is further described below with reference to specific embodiments and the accompanying drawings.
Fig. 1 shows a relay air supply refrigeration system for deep well mining with a cyclone separator 7, as shown in fig. 1, the refrigeration system for deep well mining comprises two parts, namely an air reservoir part and a refrigeration part, wherein the air reservoir part is a larger closed space formed by an exploratory circle roadway and an air wall 34, the exploratory circle roadway is a waste roadway in a mine, and the air wall 3 is arranged at the entrance of the exploratory circle roadway, so that a closed small air reservoir is formed. The refrigeration part is arranged in a closed air warehouse, and the main equipment is an air cooler 1, a fan 2, a cyclone separator 7, an air inlet pipeline 5, an air outlet pipeline 6 and a cooling water pipe 4. The air inlet source of the system is mainly non-fresh air in the underground middle roadway, the temperature and the humidity of the air inlet source are lower than those of the air inlet source of the underground middle roadway, and the air inlet source has better quality. The non-fresh air is firstly filtered by the cyclone separator 7, so that the content of dust and particulate matters in the air is greatly reduced. And a large closed space is formed by the roadway of the prospecting ore zone and the air wall 3, so that the air filtered by the cyclone separator 7 can be closed, and the pollution to the air is avoided. And clean air introduced into the air storage by the fan 2 is introduced into the air cooler 1. After being cooled in the air cooler 1, the filtered air enters a working stope or a driving face through the air outlet pipeline 6, so that the temperature of the working face is reduced.
The invention provides a deep well mining refrigeration system arranged in a deep well waste area, namely, a waste exploratory circle roadway in a deep well is utilized, a closed air reservoir is formed by arranging an air wall 3, a cyclone separator 7 is arranged in the air reservoir, and particulate matters in air are reduced to the greatest extent after being filtered by the cyclone separator 7, so that the damage to equipment such as a fan 2, an air cooler 1 and the like is effectively reduced, the service life of the equipment is prolonged, and the reliability of the system is enhanced. And corresponding refrigeration equipment is arranged in a closed prospect roadway, so that the underground abandoned space of the deep well is fully utilized, more refrigeration equipment can be arranged on the premise of not interfering stopes or tunneling work, the temperature of a working face is reduced, the underground temperature control is realized, and the aim of safe mining is fulfilled. The mode can realize cold end stope cooling, has the advantages of long service life, simple system structure, convenient control and high refrigeration efficiency, and is very suitable for deep well operation.
Preferably, non-fresh air in a larger closed space formed by the laneway of the exploration mine and the air wall 3 is introduced, and the temperature is lower than 28 DEG C
Preferably, the water in the air cooler 1 is derived from mine water flush which flows into the air cooler 1 after being precipitated, chemically treated and cooled.
Preferably, a variable frequency pump is arranged on the cold side of the air cooler 1, a temperature sensor is arranged in the working face and used for detecting the air temperature of a mining area, the variable frequency pump and the temperature sensor are in data connection with a controller, and the controller controls the power of the variable frequency pump according to the detected temperature of the temperature sensor. When the temperature of the working surface is higher than a set value, the controller controls the power of the variable frequency pump to increase, and the flow of water flowing through the air cooler 1 is increased; when the temperature of the working surface is lower than a set value, the controller controls the power of the water pump to be reduced, and the flow of water flowing through the air cooler 1 is reduced; when the downhole work is not performed, the variable frequency pump is turned off. Through the power of intellectual detection system temperature and intelligent control inverter pump, can the temperature of intelligent control working face, avoid the high temperature or cross lowly, play fine intelligent control's effect.
Preferably, when the detected temperature is higher than a certain temperature, preferably higher than 25 ℃, the power of the variable frequency pump is increased to a larger extent along with the continuous rising of the detected temperature.
Preferably, when the detected temperature is lower than a certain temperature, preferably lower than 5 ℃, the power of the variable frequency pump is reduced more and more along with the continuous reduction of the detected temperature.
Preferably, the distance between the prospect roadway and the stope or the tunneling working face is about 50-100 meters.
Preferably, each refrigeration system individually provides cooling for one stope. The pipeline between the roadway of the prospecting ore circle and the stope or the driving working face is shorter, and the purpose is to refine the pipeline. The refrigerating system is arranged in a quarry roadway which is about 50-100 meters away from a stope or a driving working face. When the stope is changed, the cooling system and the pipeline corresponding to the stope can be quickly disassembled and reinstalled, so that the flexibility of the system is improved.
Preferably, the size of the tunnel of the prospecting mine is required to be more than or equal to 3.3 meters in width, more than or equal to 2.0 meters in height and more than or equal to 2.0 meters in depth, so that the arrangement of a system is convenient.
Preferably, the air inlet pipes are all arranged at the top of the roadway, so that relatively clean air is introduced, and the load of the system is reduced.
Preferably, the cyclone 7, the fan 2 and the air cooler 1 are arranged at the ground near the air wall 3.
Preferably, the cyclone separator 7 adopts a lower air inlet mode, and because the humidity of the introduced air is high, the lower air inlet can utilize the lower space of the equipment to pre-separate the liquid drops with the diameter of more than 300-500 μm so as to reduce the load of the cyclone part.
Preferably, the hot end of the hot water supply device can provide domestic hot water by arranging the heat storage water tank, and the hot water supply device has the advantages of high heat efficiency, long transmission distance, compact equipment and high safety, and is very suitable for deep well operation.
Preferably, the cold air pipeline leading into the working stope or the heading face is arranged at the center of the cold air pipeline and can be adjusted according to the actual situation of the site.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A deep well mining relay air supply refrigeration system with a cyclone separator comprises an air cooler, a fan, an air wall, an air inlet pipeline and an air outlet pipeline, and is characterized in that the system is arranged in a quarry tunnel near a stope or a driving working face in a deep well, the air wall is utilized to form a closed small air reservoir in the space of the quarry tunnel, non-fresh air introduced into a tunnel in the middle of a mine is filtered by the cyclone separator, and air with particles discharged is introduced into the closed air reservoir to be automatically precipitated; and after heat exchange is carried out between the precipitated non-fresh air and cooling water in the air cooler, the non-fresh air is sent to a stope or a tunneling working face through a fan and a pipeline, so that the temperature of the working face is reduced.
2. The deep well mining relay air supply refrigeration system as claimed in claim 1, wherein a small air reservoir formed by the air wall and the roadway space of the prospecting mine is used as an air inlet source of the air cooler.
3. The deep well mining relay air supply refrigeration system as claimed in claim 1, wherein the air cooler is arranged in a small-sized air reservoir formed by an air wall and a roadway space of an exploratory pit.
4. The deep well mining relay air supply refrigeration system as claimed in claim 1, wherein the air cooler and the fan are uniformly distributed in an air wall and a small-sized air reservoir which enables a tunnel space of an exploratory pit to form a seal.
5. The deep well mining relay air supply refrigeration system as recited in claim 1, wherein the air inlet pipe in the prospect tunnel is arranged at the top of the tunnel.
6. The deep well mining relay air supply refrigeration system as recited in claim 1, wherein the cyclone separator adopts a lower air inlet mode to pre-separate liquid drops so as to reduce the load of the cyclone part.
7. The deep well mining relay air supply refrigeration system as recited in claim 1, wherein the cooling water is derived from mine gushing water, and the mine gushing water is sent into the air cooler after being precipitated, chemically treated and cooled.
8. The deep well mining relay air supply refrigeration system of claim 1, wherein no moisture protection design is required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210826724.6A CN115163166A (en) | 2022-07-14 | 2022-07-14 | Deep well mining relay air supply refrigeration system with cyclone separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210826724.6A CN115163166A (en) | 2022-07-14 | 2022-07-14 | Deep well mining relay air supply refrigeration system with cyclone separator |
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| CN115163166A true CN115163166A (en) | 2022-10-11 |
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| CN202210826724.6A Pending CN115163166A (en) | 2022-07-14 | 2022-07-14 | Deep well mining relay air supply refrigeration system with cyclone separator |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB102730A (en) * | 1915-12-10 | 1917-05-03 | Hugo Junkers | Improved Method and Apparatus for Cooling Mine Air. |
| GB222559A (en) * | 1923-07-02 | 1924-10-02 | Willis Haviland Carrier | A system for the cooling of mines or like chambers requiring ventilation |
| DE4442004C1 (en) * | 1994-11-28 | 1995-11-02 | Waermetechnik Gmbh | Working face air=conditioning method for underground mines |
| AU2018200880A1 (en) * | 2017-02-07 | 2018-08-23 | Zephyr Mine & Ag Services Pty Ltd | System and method for ventilating an underground mine |
| CN208534523U (en) * | 2018-06-04 | 2019-02-22 | 安徽工业大学 | A kind of metal mine underground heat disaster environment ventilation cooling system |
| CN114483151A (en) * | 2020-10-23 | 2022-05-13 | 山东高等技术研究院 | Deep stope ventilation and refrigeration system utilizing return air |
| CN115013030A (en) * | 2022-07-13 | 2022-09-06 | 山东琦瑞能源科技有限公司 | Relay air supply deep well mining refrigeration system |
-
2022
- 2022-07-14 CN CN202210826724.6A patent/CN115163166A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB102730A (en) * | 1915-12-10 | 1917-05-03 | Hugo Junkers | Improved Method and Apparatus for Cooling Mine Air. |
| GB222559A (en) * | 1923-07-02 | 1924-10-02 | Willis Haviland Carrier | A system for the cooling of mines or like chambers requiring ventilation |
| DE4442004C1 (en) * | 1994-11-28 | 1995-11-02 | Waermetechnik Gmbh | Working face air=conditioning method for underground mines |
| AU2018200880A1 (en) * | 2017-02-07 | 2018-08-23 | Zephyr Mine & Ag Services Pty Ltd | System and method for ventilating an underground mine |
| CN208534523U (en) * | 2018-06-04 | 2019-02-22 | 安徽工业大学 | A kind of metal mine underground heat disaster environment ventilation cooling system |
| CN114483151A (en) * | 2020-10-23 | 2022-05-13 | 山东高等技术研究院 | Deep stope ventilation and refrigeration system utilizing return air |
| CN115013030A (en) * | 2022-07-13 | 2022-09-06 | 山东琦瑞能源科技有限公司 | Relay air supply deep well mining refrigeration system |
Non-Patent Citations (1)
| Title |
|---|
| 曹佳馨等: "《化工机械技术辞典》", 华东化工学院出版社, pages: 146 * |
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