CN209908563U - Multi-energy complementary coal mine ventilation air methane heat pump wellhead anti-freezing system - Google Patents
Multi-energy complementary coal mine ventilation air methane heat pump wellhead anti-freezing system Download PDFInfo
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- CN209908563U CN209908563U CN201920524469.3U CN201920524469U CN209908563U CN 209908563 U CN209908563 U CN 209908563U CN 201920524469 U CN201920524469 U CN 201920524469U CN 209908563 U CN209908563 U CN 209908563U
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Abstract
The utility model belongs to the technical field of coal mine heat energy utilization, in particular to a multi-energy complementary coal mine ventilation air heat pump wellhead anti-freezing system, which comprises a ventilation air heating box, a water source heat pump unit, an air source heat pump unit, an energy storage water tank, a wellhead heater and a cleaning defrosting device, wherein the ventilation air heating box is connected in series in a mine ventilation air pipe, and a heat exchanger arranged in the ventilation air heating box is communicated with an evaporator of the water source heat pump unit through a refrigerant pipeline; condenser ends of the water source heat pump unit and the air source heat pump are communicated with the energy storage water tank through pipelines; the energy storage water tank is communicated with the wellhead heater through a pipeline, and the wellhead heater is used for heating outdoor fresh air through hot water in the energy storage water tank and then sending the hot air to a wellhead; the cleaning and defrosting device is used for cleaning a heat exchanger in the ventilation air methane heating box. The utility model discloses can improve ventilation air methane waste heat energy utilization ratio, reduce well head anti-freezing system equipment cost, can wide application in the colliery field.
Description
Technical Field
The utility model belongs to the technical field of colliery heat utilization, concretely relates to complementary colliery ventilation air methane heat pump well head anti-freezing system of multipotency.
Background
The existing mine ventilation air methane waste heat recycling technology for coal mines mainly has three completely different technical routes.
The first is the spray-type ventilation air heat pump technology, namely, water or an antifreeze aqueous solution which is lower than the ventilation air temperature is utilized, spray rows are utilized to spray and return air is filled with air for heat exchange in a return air diffusion tower, and then a heat pump unit is utilized to prepare high-temperature hot water. The spraying type heat taking has the defects of small heat taking amount, easy accumulation of a large amount of dust, easy nozzle blockage, continuous addition of an antifreeze agent and the like when the temperature of ventilation air is lower than 10 ℃.
The other is a direct evaporation type heat pump technology, namely, a finned evaporator of an air source heat pump unit is directly placed in a ventilation air methane channel, and heat exchange is directly carried out between a refrigerant and ventilation air methane to prepare hot water or hot air. The direct evaporation type heat pump has the advantages that as more dust is mixed in ventilation air, a ventilation air heat collector (a finned evaporator) is easily blocked by the dust, and the like, the air resistance of a ventilation air heat exchanger (the finned evaporator) is large, meanwhile, the heat exchange area of the evaporator is small when the direct evaporation type heat pump is used for heat collection, the heating efficiency of the ventilation air source heat pump is influenced by the problem that the evaporator is frosted and defrosted when the ventilation air temperature is low, the distance between a heat collection device and a heat pump unit and the height difference are limited, and the application and popularization of the direct evaporation type ventilation air source heat pump are directly limited.
And thirdly, a heat pipe heat energy recovery technology is adopted, the fresh air and the return air pipeline are stacked up and down, the heat pipes are directly used for heat exchange, and the heat of the ventilation air is used for directly heating the fresh air. The heat pipe heat energy recovery technology is influenced by the distance between a fresh air shaft and an air exhaust shaft, and meanwhile, because a large amount of dust exists in the air exhaust, the dust can be accumulated on the surface of the evaporation end of the heat pipe, so that heat exchange can be influenced for a long time, the temperature of inlet air cannot be guaranteed, the heat pipe heat energy recovery technology is still in a test verification stage, other heat sources are required to be supplemented, and the final effect of well mouth freeze prevention can be guaranteed.
Meanwhile, the three ventilation air waste heat utilization technologies have the problems of high initial investment or high operating cost, belong to coal saving and energy saving when being used in partial coal mines, and only solve the problems of adoption of clean energy for replacement, unobvious energy-saving economic benefits, high popularization difficulty and the like.
The domestic part of enterprises also put forward the mode of directly utilizing return air and new trend to carry out the heat transfer through wind-air heat exchanger, recycling air source heat pump and carrying out the concurrent heating, because the heat transfer area that wind-air heat exchanger needs is great, and investment cost is high, still has the problem that a large amount of dusts are gathered on the surface of heat exchanger in the ventilation air in addition, and the heat transfer effect is difficult to guarantee the scheduling problem.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the current coal mine ventilation air methane waste heat utilization process and the mine air heating mode on exist not enough, the utility model aims at providing an operation windage is little, can long-term stable operation not influence the ventilation air methane waste heat utilization system of ventilation air methane normal work simultaneously.
In order to solve the technical problem, the utility model discloses a technical scheme be: a multi-energy complementary coal mine ventilation air methane heat pump wellhead anti-freezing system comprises a ventilation air methane heat-taking box, a water source heat pump unit, an air source heat pump unit, an energy storage water tank, a wellhead heater and a cleaning and defrosting device, wherein the ventilation air methane heat-taking box is connected in series in a ventilation air pipe of a mine, a heat exchanger is arranged in the ventilation air methane heat-taking box, the heat exchanger in the ventilation air methane heat-taking box is communicated with an evaporator of the water source heat pump unit through a cold carrier pipeline, and is used for taking heat from coal mine ventilation air methane through the heat exchanger arranged in the ventilation air methane heat-taking box and conveying the heat to the evaporator; condenser ends of the water source heat pump unit and the air source heat pump are communicated with the energy storage water tank through pipelines and are used for heating water in the energy storage water tank; the energy storage water tank is communicated with the wellhead heater through a pipeline, and the wellhead heater is used for heating outdoor fresh air through hot water in the energy storage water tank and then sending the hot air to a wellhead; the cleaning and defrosting device is used for cleaning a heat exchanger in the ventilation air methane heating box.
A first heat exchanger, a second heat exchanger, a first spray row and a second spray row are arranged in the ventilation air methane heat-taking box; the cleaning and defrosting device is communicated with the energy storage water tank through a water supply pump and is used for pumping hot water from the energy storage water tank; the first spraying row and the second spraying row are connected with the cleaning and defrosting device through cleaning pumps and are used for cleaning the first heat exchanger and the second heat exchanger through hot water in the cleaning and defrosting device.
The water source heat pump unit comprises a first water source heat pump and a second water source heat pump, a heat exchanger in the ventilation air heating box and a secondary refrigerant pipeline between the first water source heat pump and an evaporator of the second water source heat pump are provided with a first secondary refrigerant circulating pump and a second secondary refrigerant circulating pump which are connected in parallel, condensers of the first water source heat pump and the second water source heat pump and a pipeline between the energy storage water tanks are provided with a first hot water circulating pump and a second hot water circulating pump which are connected in parallel, and the air source heat pump unit is connected at two ends of the water source heat pump unit in parallel.
The air source heat pump unit comprises a first low-temperature air source heat pump, a second low-temperature air source heat pump and a third low-temperature air source heat pump, wherein the first low-temperature air source heat pump, the second low-temperature air source heat pump and the third low-temperature air source heat pump are connected in series or in parallel.
The wellhead heater is internally provided with a first dividing wall type heat exchanger, a second dividing wall type heat exchanger and a blower, the first dividing wall type heat exchanger and the second dividing wall type heat exchanger are communicated with the energy storage water tank through pipelines, and a first heat supply circulating pump and a second heat supply circulating pump which are connected in parallel are arranged on the pipelines between the first dividing wall type heat exchanger and the energy storage water tank and between the second dividing wall type heat exchanger and the energy storage water tank.
The water source heat pump unit comprises 1 ~ 4 water source heat pumps, and the water source heat pumps are flooded water source heat pumps, dry water source heat pumps or falling film water source heat pumps.
The number of the ventilation air methane heating boxes is 1 ~ 4.
The number of the wellhead heaters is 1 ~ 4.
The air source heat pump unit comprises a plurality of low-temperature air source heat pumps which are connected in series or in parallel.
The heat exchanger fins in the ventilation air methane heat-taking box are made of stainless steel or red copper or anticorrosive hydrophilic aluminum foil.
Compared with the prior art, the utility model following beneficial effect has: the utility model discloses heat in the make full use of colliery ventilation air methane through as the heat source at the mine return air, utilizes low temperature water source heat pump, carries the heat in the ventilation air to the technology hot-water aquatic, when ventilation air heat pump heating capacity is not enough, can open low temperature type air source heat pump as the replenishment simultaneously, realizes multipotency complementary. The energy storage water tank is used for storing energy, the fluctuation of the thermal load of the system is balanced, and the peak clipping and valley filling functions are achieved. The hot water in the energy storage water tank is heated by the ventilation air source heat pump and the low-temperature air source heat pump, the hot water in the energy storage water tank is used as a heat source of the wellhead heater, fresh air outside the heating chamber is heated, the overall operation efficiency of the wellhead anti-freezing system is improved, the energy is saved, the environment is protected, and the coal-fired boiler can be completely replaced.
The utility model discloses combine together ventilation air methane heat transfer technique and low temperature water source heat pump technique, low temperature type air source heat pump technique, water heat accumulation technique and air heating technique, the defect that probably appears in avoiding current ventilation air methane waste heat utilization system or heat pipe heat transfer technology system to move completely, it is obvious to compare energy-conserving advantage with traditional well head mode of preventing frostbite.
When the wellhead is in anti-freezing operation, the heat load and the air temperature synchronously fluctuate because the outdoor air temperature fluctuates. In the actual operation of well head anti-freezing, the water source heat pump unit can be selected to operate independently according to the outdoor air temperature, and the water source heat pump unit and the low-temperature air source heat pump unit can also be selected to operate jointly. The type and the number of the heat pump units which are put into operation are selected according to the change of the outdoor environment temperature, so that the operation cost of the heat pump equipment can be reduced, the operation time of the heat pump units is reduced, the energy consumption is reduced obviously, the operation is reliable, the energy is saved remarkably, the coal reduction and emission reduction of a coal mine can be realized, the operation cost is saved, clean energy is adopted, the environmental pollution is reduced, the ventilation air waste heat resource is effectively utilized, the energy is saved, the environment is protected, and the.
Drawings
Fig. 1 is a system schematic diagram of a multi-energy complementary coal mine ventilation air heat pump wellhead anti-freezing system provided by the embodiment of the utility model.
In the figure: the system comprises a ventilation air methane heating box 1, a first water source heat pump 2, a wellhead heater 3, an energy storage water tank 4, a first low-temperature air source heat pump 5, a second low-temperature air source heat pump 6, a third low-temperature air source heat pump 7, a first heat supply circulating pump 8, a second heat supply circulating pump 9, a water supply pump 10, a first hot water circulating pump 11, a second hot water circulating pump 12, a second water source heat pump 13, a first secondary refrigerant circulating pump 14, a second secondary refrigerant circulating pump 15, a cleaning pump 16, a cleaning defrosting device 18, a first heat exchanger 21, a first spray row 22, a second spray row 23, a second heat exchanger 24, a first partition wall type heat exchanger 31, a second partition wall type heat exchanger 32 and a blower 33.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the embodiment of the utility model provides a complementary colliery ventilation air methane heat pump well head anti-freezing system of multipotency, including ventilation air methane heat-taking box 1, water source heat pump unit, air source heat pump unit, energy storage water tank 4, well head heater 3 and washing defrosting device 18, ventilation air methane heat-taking box 1 establishes ties in the mine ventilation air pipe, and its inside is provided with the heat exchanger, the heat exchanger in ventilation air methane heat-taking box 1 communicates with the evaporimeter of water source heat pump unit through the refrigerant pipeline for heat is got from the colliery ventilation air methane through the heat exchanger that the inside set up, and carry the heat in the evaporimeter of water source heat pump unit through the secondary refrigerant; condenser ends of the water source heat pump unit and the air source heat pump are communicated with the energy storage water tank 4 through pipelines and are used for heating water in the energy storage water tank 4; the energy storage water tank 4 is communicated with the wellhead heater 3 through a pipeline, and the wellhead heater is used for heating outdoor fresh air through hot water in the energy storage water tank 4 and then sending the hot air to a wellhead; the cleaning and defrosting device is used for cleaning a heat exchanger in the ventilation air methane heating box.
Specifically, as shown in fig. 1, in the present embodiment, a first heat exchanger 21, a second heat exchanger 24, a first spray row 22 and a second spray row 23 are disposed in the ventilation air methane heat-extracting box 1; the cleaning and defrosting device 18 is communicated with the energy storage water tank through a water supply pump 10, and the cleaning and defrosting device 18 pumps hot water from the energy storage water tank 4 through the water supply pump 10; the first spray row 22 and the second spray row 23 are connected with the cleaning and defrosting device 18 through a cleaning pump 16, and are used for cleaning the first heat exchanger 21 and the second heat exchanger 24 through hot water in the cleaning and defrosting device 18. When the first heat exchanger 21 or the second heat exchanger 24 frosts or needs to be cleaned, the water supply pump 10 inputs hot water in the energy storage water tank 4 into the cleaning and defrosting device 18, the cleaning pump 16 sprays hot water to the first heat exchanger 21 by using the first spray row 22 for cleaning or defrosting, and sprays hot water to the second heat exchanger 24 by using the second spray row 23 for cleaning or defrosting.
Furthermore, the number of the ventilation air methane heat-taking boxes can be 1, and can also be 2 ~ 4 according to the requirement, and furthermore, the fin material of the heat exchanger 21 in the ventilation air methane heat-taking box 1 is stainless steel, red copper or anticorrosive hydrophilic aluminum foil.
Specifically, as shown in fig. 1, in this embodiment, the water source heat pump unit includes a first water source heat pump 2 and a second water source heat pump 13, a first coolant circulation pump 14 and a second coolant circulation pump 15 connected in parallel are disposed on a coolant pipeline between a heat exchanger in the ventilation air heating tank 1 and an evaporator of the first water source heat pump 2 and the second water source heat pump 13, a first hot water circulation pump 11 and a second hot water circulation pump 12 connected in parallel are disposed on a pipeline between the heat exchanger of the first water source heat pump 2 and the second water source heat pump 13 and the energy storage water tank 4, and the air source heat pump unit is connected in parallel at two ends of the water source heat pump unit. The first secondary refrigerant circulating pump 14 and the second secondary refrigerant circulating pump 15 are used for conveying secondary refrigerants to circulate between an evaporator of the water source heat pump unit and the ventilation air methane heat-taking box 1, the first hot water circulating pump 11 and the second hot water circulating pump 12 are used for conveying water in the energy storage water tank 4 to circulate between a condenser of the water source heat pump unit and the energy storage water tank 4, and the low-temperature air source heat pump unit is used for supplementing heat to the energy storage water tank 4.
Furthermore, the utility model discloses in, the quantity of the water source heat pump among the water source heat pump set can be 2, also can be 1 ~ 4, and its quantity can be set for according to actual need.
Specifically, as shown in fig. 1, in this embodiment, the air source heat pump unit includes a first low-temperature air source heat pump 5, a second low-temperature air source heat pump 6, and a third low-temperature air source heat pump 7, and the first low-temperature air source heat pump 5, the second low-temperature air source heat pump 6, and the third low-temperature air source heat pump 7 are connected in series. In addition, the low-temperature air source heat pumps may be connected in parallel. In addition, although the air source heat pump unit in the embodiment includes 3 air source heat pumps, it should be noted that the air source heat pump unit may include a plurality of low temperature type air source heat pumps, and the plurality of low temperature type air source heat pumps are connected in series or in parallel. The quantity of the air source heat pumps of the air source heat pump unit can be reasonably configured according to the anti-freezing heat load quantity and the limit air temperature of the wellhead, the air source heat pumps serve as important supplements of the ventilation air source heat pump system and are used for supplementing heat for the energy storage water tank 4, when the water temperature in the energy storage water tank is lower than a set value, the first low-temperature type air source heat pump 5, the second low-temperature type air source heat pump 6, the third low-temperature type air source heat pump 7 and other units are sequentially input, the ventilation air source heat pumps and the air source heat pumps can supplement each other, and the anti-freezing heat supply requirement of the wellhead is.
Specifically, as shown in fig. 1, a first dividing wall type heat exchanger 31, a second dividing wall type heat exchanger 32 and a blower 33 are arranged in the wellhead heater 3, the first dividing wall type heat exchanger 31 and the second dividing wall type heat exchanger 32 are communicated with the energy storage water tank 4 through pipelines, and a first heat supply circulating pump 8 and a second heat supply circulating pump 9 which are connected in parallel are arranged on the pipelines between the first dividing wall type heat exchanger 31 and the energy storage water tank 4 and between the second dividing wall type heat exchanger 32 and the energy storage water tank 4. The wellhead heater 3 utilizes the first heat supply circulating pump 8 or the second heat supply circulating pump 9 to convey hot water from the energy storage water tank 4 to the dividing wall type heat exchanger, heats fresh air from the outdoor, and then under the action of the air feeder 33, the hot water is conveyed to the wellhead to be mixed with the fresh air from the outdoor, so that the inlet air temperature is ensured to be higher than 2 ℃, and the function of preventing the wellhead from freezing is realized.
Further, the number of the wellhead heaters 3 can be 1, and also can be provided with a plurality of heaters according to needs.
The utility model discloses combine together ventilation air methane heat transfer technique and low temperature water source heat pump technique, low temperature type air source heat pump technique, water heat accumulation technique and air heating technique, the defect that probably appears in avoiding current ventilation air methane waste heat utilization system or heat pipe heat transfer technology system to move completely, it is obvious to compare energy-conserving advantage with traditional well head mode of preventing frostbite. Furthermore, the utility model discloses quantity or total heating capacity that can rational configuration ventilation air methane source heat pump and air source heat pump reduces the well head and prevents frostbite system equipment initial investment. And according to the change of the environmental temperature, the air source heat pump and the ventilation air source heat pump can be put into the energy storage water tank to heat water for heat storage when the temperature is higher, and the energy storage water tank is put into the wellhead anti-freezing operation when the temperature is lower, so that the initial investment of a wellhead anti-freezing system can be reduced, the ventilation air waste heat resource is effectively utilized, the energy-saving and environment-friendly effects are achieved, and the practicability is good.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The multi-energy complementary coal mine ventilation air methane heat pump wellhead anti-freezing system is characterized by comprising a ventilation air methane heat-taking box (1), a water source heat pump unit, an air source heat pump unit, an energy storage water tank, a wellhead heater (3) and a cleaning and defrosting device (18), wherein the ventilation air methane heat-taking box (1) is connected in series in a ventilation air pipe of a mine, a heat exchanger is arranged in the ventilation air methane heat-taking box, the heat exchanger in the ventilation air methane heat-taking box (1) is communicated with an evaporator of the water source heat pump unit through a cold carrier pipeline, and is used for taking heat from coal mine ventilation air methane through the heat exchanger arranged in the ventilation air methane heat-taking box and conveying the heat to the evaporator of; condenser ends of the water source heat pump unit and the air source heat pump are communicated with the energy storage water tank (4) through pipelines and are used for heating water in the energy storage water tank (4); the energy storage water tank (4) is communicated with the wellhead heater (3) through a pipeline, and the wellhead heater is used for heating outdoor fresh air through hot water in the energy storage water tank (4) and then sending the hot air to a wellhead; the cleaning and defrosting device is used for cleaning a heat exchanger in the ventilation air methane heating box.
2. The multi-energy complementary coal mine ventilation air heat pump wellhead antifreeze system according to claim 1, characterized in that a first heat exchanger (21), a second heat exchanger (24), a first spray row (22) and a second spray row (23) are arranged in the ventilation air heat-extracting box (1); the cleaning and defrosting device (18) is communicated with the energy storage water tank through a water supply pump (10) and is used for pumping hot water from the energy storage water tank; the first spray row (22) and the second spray row (23) are connected with the cleaning and defrosting device (18) through a cleaning pump (16) and used for cleaning the first heat exchanger (21) and the second heat exchanger (24) through hot water in the cleaning and defrosting device (18).
3. The multi-energy complementary coal mine ventilation air methane heat pump wellhead anti-freezing system according to claim 1, characterized in that the water source heat pump unit comprises a first water source heat pump (2) and a second water source heat pump (13), a first secondary refrigerant circulating pump (14) and a second secondary refrigerant circulating pump (15) which are connected in parallel are arranged on a secondary refrigerant pipeline between a heat exchanger in the ventilation air methane heat-taking box (1) and evaporators of the first water source heat pump (2) and the second water source heat pump (13), a first hot water circulating pump (11) and a second hot water circulating pump (12) which are connected in parallel are arranged on pipelines between condensers of the first water source heat pump (2) and the second water source heat pump (13) and the energy storage water tank (4), and the air source heat pump unit is connected in parallel at two ends of the water source heat pump unit.
4. The multi-energy complementary coal mine ventilation air methane heat pump wellhead anti-freezing system according to claim 3, wherein the air source heat pump unit comprises a first low-temperature type air source heat pump (5), a second low-temperature type air source heat pump (6) and a third low-temperature type air source heat pump (7), and the first low-temperature type air source heat pump (5), the second low-temperature type air source heat pump (6) and the third low-temperature type air source heat pump (7) are connected in series or in parallel.
5. The multi-energy complementary coal mine ventilation air heat pump wellhead anti-freezing system according to claim 1, characterized in that a first dividing wall type heat exchanger (31), a second dividing wall type heat exchanger (32) and a blower (33) are arranged in the wellhead heater (3), the first dividing wall type heat exchanger (31) and the second dividing wall type heat exchanger (32) are communicated with the energy storage water tank (4) through pipelines, and a first heat supply circulating pump (8) and a second heat supply circulating pump (9) which are connected in parallel are arranged on the pipelines between the first dividing wall type heat exchanger (31) and the second dividing wall type heat exchanger (32) and the energy storage water tank (4).
6. The multi-energy complementary coal mine ventilation air heat pump wellhead antifreeze system according to claim 1, wherein said water source heat pump unit comprises 1 ~ 4 water source heat pumps, said water source heat pumps being flooded, dry or falling film water source heat pumps.
7. The multi-energy complementary coal mine ventilation air methane heat pump wellhead antifreeze system according to claim 1, characterized in that the number of the ventilation air methane heat-taking boxes (1) is 1 ~ 4.
8. The multi-energy complementary coal mine ventilation air heat pump wellhead anti-freezing system as claimed in claim 1, characterized in that the number of wellhead heaters (3) is 1 ~ 4.
9. The multi-energy complementary coal mine ventilation air heat pump wellhead anti-freezing system according to claim 1, wherein the air source heat pump unit comprises a plurality of low-temperature air source heat pumps which are connected in series or in parallel.
10. The multi-energy complementary coal mine ventilation air heat pump wellhead antifreeze system according to claim 1, characterized in that the material of the heat exchanger fins in the ventilation air heat-extraction box (1) is stainless steel or red copper or anticorrosive hydrophilic aluminum foil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110043313A (en) * | 2019-04-18 | 2019-07-23 | 太原向明智能装备股份有限公司 | One kind is provided multiple forms of energy to complement each other coal mine methane heat pump wellhead anti-freezing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043313A (en) * | 2019-04-18 | 2019-07-23 | 太原向明智能装备股份有限公司 | One kind is provided multiple forms of energy to complement each other coal mine methane heat pump wellhead anti-freezing system |
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Address after: 030032 No.89, Tanghuai Road, Taiyuan Tanghuai Park, comprehensive reform demonstration zone, Taiyuan City, Shanxi Province Patentee after: Taizhong Xiangming Intelligent Equipment Co.,Ltd. Address before: 030000 No.89, Tanghuai Road, Taiyuan Tanghuai Park, Shanxi comprehensive reform demonstration zone, Taiyuan City, Shanxi Province Patentee before: TAIYUAN XIANGMING INTELLIGENT EQUIPMENT Co.,Ltd. |
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