CN209101827U - A kind of rotary kiln residual neat recovering system - Google Patents
A kind of rotary kiln residual neat recovering system Download PDFInfo
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- CN209101827U CN209101827U CN201821730459.7U CN201821730459U CN209101827U CN 209101827 U CN209101827 U CN 209101827U CN 201821730459 U CN201821730459 U CN 201821730459U CN 209101827 U CN209101827 U CN 209101827U
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Abstract
The utility model provides a kind of rotary kiln residual neat recovering system, including rotary kiln, heat exchanger and heat exchanger tube；Wherein, rotary kiln has kiln hood and kiln tail, and kiln tail is equipped with the gas outlet for exhaust gas to be discharged, and kiln hood is equipped with clinker outlet and combustion-supporting gas import；The zone of heat liberation of heat exchanger is connected to the gas outlet of kiln tail, and the cold fluid outlet of heat exchanger is equipped with the drying air piping for connecting with dry kiln air inlet.Heat exchanger tube is equipped with feed inlet, air inlet and exhaust outlet, and feed inlet and the clinker outlet of heat exchanger tube connect, and the gas outlet of heat exchanger tube passes through hot air duct and combustion-supporting gas inlet communication.Rotary kiln residual neat recovering system disclosed by the utility model reduces the operating power consumption of rotary kiln using the sensible heat of heat exchanger tube recycling kiln hood high temperature chamotte；Simultaneously using the waste heat of heat exchanger recycling kiln tail high-temp waste gas, the energy consumption of dry kiln is reduced, realizes recycling thermal energy, energy-saving and environment-friendly effect.
Description
Technical field
The utility model relates to mineral technical field of smelting, more specifically to a kind of rotary kiln residual neat recovering system.
Background technique
Rotary kiln can calcine the materials such as active lime, have a wide range of applications in industries such as cement, metallurgy.It returns
Rotary kiln usually has the kiln body of tubular, and kiln body both ends are respectively kiln hood and kiln tail, and the height of kiln tail is higher than the height of kiln hood.
During the work time, raw material enter kiln body from kiln tail, and material is mobile to kiln hood inside kiln body, while combustion-supporting gas
Continuously enter kiln body from kiln hood, provides oxygen for the burning of material.After the completion of calcining, clinker is discharged from kiln hood, and combustion-supporting gas
It is changed into high-temp waste gas after combustion, is discharged from kiln tail.Rotary kiln carries out in calcination process material, and kiln hood can be distributed to outside
A large amount of radiant heat, while kiln tail also can not only exacerbate greenhouse effects to outside drain high-temp waste gas, also create the wave of the energy
Take.
In conclusion the heat of rotary kiln running generation how is recycled, thus it is energy saving, it is current those skilled in the art
Member's urgent problem to be solved.
Utility model content
In view of this, the purpose of the utility model is to provide a kind of rotary kiln residual neat recovering system, it can be to revolution firer
As when the heat that generates be recycled, reduce the consumption of the energy.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of rotary kiln residual neat recovering system, comprising:
Rotary kiln with kiln hood and kiln tail, the kiln tail are equipped with the gas outlet for exhaust gas to be discharged, and the kiln hood is equipped with
Clinker outlet and combustion-supporting gas import；
Heat exchanger, the zone of heat liberation of the heat exchanger are connected to the gas outlet of the kiln tail, the cold flow of the heat exchanger
Body outlet is equipped with the drying air piping for connecting with dry kiln air inlet.
Heat exchanger tube, the heat exchanger tube be equipped with feed inlet, air inlet and exhaust outlet, the feed inlet of the heat exchanger tube with it is described ripe
The gas outlet of material outlet connection, the heat exchanger tube passes through hot air duct and the combustion-supporting gas inlet communication.
Preferably, hot precipitator is equipped between the gas outlet of the kiln tail and the hot fluid inlet of the heat exchanger.
Preferably, the hot precipitator is metal film hot precipitator；And/or the heat exchanger is board-like air preheater.
Preferably, the thermal radiation collection case for wrapping up the kiln hood, the thermal radiation collection case are equipped with outside the rotary kiln
Equipped with gas outlet；The cold fluid inlet of the heat exchanger is connect by air inducing pipeline with the gas outlet of the thermal radiation collection case.
Preferably, the gas passage of the air inducing pipeline is equipped with the first air-introduced machine；And/or the hot fluid of the heat exchanger
The gas passage of outlet is successively arranged the second air-introduced machine and the chimney for discharge gas.
Preferably, the heat exchanger tube includes horizontal segment heat exchanger and vertical section heat exchanger, vertical section heat exchanger one end
Connect with the kiln hood, the other end is connect with the end of the horizontal segment heat exchanger, the horizontal segment heat exchanger far from it is described hang down
One end of straight section heat exchanger is equipped with air blower.
Preferably, the horizontal segment heat exchanger is rotatable tubular structure, and the inner sidewall of the tubular structure is equipped with
Helical blade for overturning material uniformly.
Preferably, the feed inlet of the heat exchanger tube and gas outlet are set to the same end of the vertical section heat exchanger, described
The discharge port and air inlet of heat exchanger tube are set to the same end of the horizontal segment heat exchanger.
Preferably, high temperature draught fan is equipped in the gas passage of the hot air duct.
Preferably, cyclone dust collectors are equipped between the heat exchanger tube and the high temperature draught fan.
Rotary kiln residual neat recovering system provided by the utility model includes rotary kiln, heat exchanger and heat exchanger tube；Wherein, it turns round
Kiln furnitures have kiln hood and kiln tail；The zone of heat liberation of heat exchanger is connected to the gas outlet of kiln tail and cold fluid outlet is equipped with dry wind
Pipeline；The feed inlet of heat exchanger tube and the clinker of kiln hood are exported and are connected, the gas outlet of heat exchanger tube and combustion-supporting gas inlet communication.
During the work time, kiln tail discharge exhaust gas temperature it is higher, exhaust gas as heat exchanger hot fluid in heat exchanger
It exchanges heat, dry kiln can be entered by dry air piping after gas medium heat absorption, reduce the energy consumption of dry kiln, realize
Recycling to waste-gas heat.Meanwhile air and the high temperature chamotte of kiln tail carry out heat exchange in heat exchanger tube, it can after air heat absorption
Combustion-supporting gas as rotary kiln uses, the energy needed for reducing rotary kiln heated material.
Rotary kiln residual neat recovering system provided by the present application carries out the thermal energy of kiln hood clinker sensible heat and kiln tail gas waste heat
Recycling, reduces the energy consumption of rotary kiln and dry kiln, realizes recovery waste heat, energy-saving and environment-friendly effect.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the structural schematic diagram of rotary kiln residual neat recovering system provided by the utility model.
Appended drawing reference in Fig. 1 are as follows:
Thermal radiation collection case 1, the first air-introduced machine 2, rotary kiln 3, air inducing pipeline 4, smoke pipe 5, hot precipitator 6, dry wind
Pipeline 7, heat exchanger 8, the second air-introduced machine 9, chimney 10, feeder pipe 11, air blower 12, horizontal segment heat exchanger 13, vertical section heat exchange
Device 14, cyclone dust collectors 15, high temperature draught fan 16, hot air duct 17.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The core of the utility model is to provide a kind of rotary kiln residual neat recovering system, generates when can work rotary kiln
Heat is recycled, and efficiently solves the problem of rotary kiln heat recovery effect difference.
Referring to FIG. 1, Fig. 1 is the structural schematic diagram of rotary kiln residual neat recovering system provided by the utility model, wherein
Arrow in figure indicates the flow direction of medium.
The utility model provides a kind of rotary kiln residual neat recovering system, including rotary kiln 3, heat exchanger 8 and heat exchanger tube；Its
In, rotary kiln 3 has kiln hood and a kiln tail, and kiln tail is equipped with gas outlet for exhaust gas to be discharged, and kiln hood is equipped with clinker outlet and combustion-supporting
Gas feed；The zone of heat liberation of heat exchanger 8 is connected to the gas outlet of kiln tail, the cold fluid outlet of heat exchanger 8 be equipped with for
The drying air piping 7 of dry kiln air inlet connection.Heat exchanger tube is equipped with feed inlet, discharge port, air inlet and exhaust outlet, heat exchanger tube
Feed inlet and clinker outlet connect, and the gas outlet of heat exchanger tube passes through hot air duct 17 and combustion-supporting gas inlet communication.
Specifically, rotary kiln 3 can accommodate material and burning needed for combustion-supporting gas, while rotary kiln 3 is equipped with can
The heating component that material is calcined.Kiln hood and kiln tail are located at turn around the both ends of kiln 3, and kiln hood is used for defeated to 3 inside of rotary kiln
It send combustion-supporting gas while the clinker that calcining is completed is discharged, be provided with combustion-supporting gas import and clinker outlet；Kiln tail be used for return
3 delivered inside of rotary kiln raw material to be calcined, while the exhaust gas of combustion process generation is discharged, it is provided with raw material entrance and discharge is useless
The gas outlet of gas.
The clinker temperature of kiln hood discharge is higher, and heat exchanger tube is connect by feeder pipe 11 with the clinker exit seal of kiln hood, into
And clinker is made to enter heat exchanger tube and exchange heat with air, to recycle the thermal energy of clinker.During the work time, air and high temperature
Clinker is delivered to the combustion-supporting gas import of kiln hood by hot air duct 17 after being exchanged heat, the combustion-supporting gas as rotary kiln 3 makes
With the thermal efficiency of raising rotary kiln 3 reduces the energy consumption of rotary kiln 3；Heat exchanger tube can also cool down to high temperature chamotte simultaneously,
The energy needed for further saving cooling clinker.
Heat exchanger 8 be using gas as the heat-exchanger rig of medium, specifically, heat exchanger 8 using gas medium as cold fluid, with kiln
Tail exhaust gas is that hot fluid carries out heat transfer process, and temperature increases after gas medium absorbs heat energy from waste gas, and passes through the hot-fluid of heat exchanger 8
Body outlet enters dry air piping 7.Heat exchanger 8 can specifically use board-like air preheater or other kinds of heat exchanger, specific
Structure can refer to the prior art.
Dry air piping 7 and the cold fluid outlet of heat exchanger 8 are tightly connected, for that will absorb the gas conduct of heat energy from waste gas
Dry wind is passed through inside dry kiln and uses.
Rotary kiln residual neat recovering system provided by the present application is provided with heat exchanger tube and heat exchanger 8, during the work time, heat exchange
Gas medium after heat absorption and is passed through dry kiln as dry wind and made by device 8 using the thermal energy of gas medium recycling kiln tail gas
With the energy that reduction dry kiln is expended when heat drying is gases used；Heat exchanger tube can recycle the high temperature of kiln hood discharge simultaneously
The thermal energy of clinker, and be passed through using the air after heat absorption as combustion-supporting gas the combustion-supporting gas import of kiln hood, reduce rotary kiln 3 plus
The energy needed for hot combustion-supporting gas.Therefore, rotary kiln residual neat recovering system provided by the present application is to kiln hood high temperature chamotte and kiln tail
The thermal energy of high-temp waste gas is recycled, and recovery waste heat, energy-saving and environment-friendly effect are realized.
Further, it is contemplated that be mingled with a large amount of impurity in the exhaust gas of kiln tail, may cause the abrasion of heat exchanger 8, therefore
Hot precipitator 6 is equipped in the present embodiment between the gas outlet of kiln tail and the hot fluid inlet of heat exchanger 8.Hot precipitator 6 is used
It is dusted, can be connect with the waste gas outlet of kiln tail by smoke pipe 5 in high-temp waste gas.Hot precipitator 6 can be to exhaust gas
It is purified, reaches discharge standard；It is also able to extend the service life of heat exchanger 8 simultaneously.
Optionally, since the exhaust gas temperature of kiln tail discharge is higher, and chlorine element is usually contained in exhaust gas, therefore the present embodiment
High temperature deduster 6 preferably uses metal film hot precipitator, on the one hand ensures the steady operation of equipment in the high temperature environment；Separately
On the one hand it can be dusted dechlorination to exhaust gas, avoids the corrosion of equipment, while reduce environmental pollution caused by discharge exhaust gas.It can
With understanding, hot precipitator 6 can also use other kinds of dust-extraction unit, and specific structure can refer to the prior art.
It should be noted that the prior art, when handling kiln tail gas, exhaust gas usually first passes through cooling stack and enters whirlwind
Dust-extraction unit, then using being discharged outward after the processing of wet scrubber；And in the present embodiment, first in exhaust gas circulation passage
High temperature section be dusted processing, then recycle waste gas residual heat using heat exchanger 8, finally carry out cooling discharge.Using this implementation
The rotary kiln residual neat recovering system that example provides can effectively recycle the waste heat of exhaust gas, and extend the service life of equipment.
Further, in order to reinforce waste heat recovering effect, on the basis of any one above-mentioned embodiment, outside rotary kiln 3
Portion is equipped with the thermal radiation collection case 1 of package kiln hood, and thermal radiation collection case 1 is equipped with gas outlet；The cold fluid inlet of heat exchanger 8 passes through
Air inducing pipeline 4 is connect with the gas outlet of thermal radiation collection case 1.
Specifically, thermal radiation collection case 1 is hot gas aggregation apparatus, the outside of kiln hood and rotary kiln 3 is set.Heat radiation is received
Header 1 can be provided with hatch frame using rectangular or other shapes the body structure of carbon steel material production, side wall.In reality
In the installation process of border, the hatch frame of thermal radiation collection case 1 can be fitted and connected with the lateral wall of rotary kiln 3, can also be with empty set
In the periphery of rotary kiln 3.
The kiln body of kiln hood and rotary kiln 3 is warm to external emitting radiant, the air absorptive thermal radiation inside thermal radiation collection case 1
And increase certain temperature.It should be understood that exchange heat since the gas of absorptive thermal radiation needs to continue into heat exchanger 8,
Therefore thermal radiation collection case 1 needs to offer the venthole for making gas circulate.
During the work time, the air inside thermal radiation collection case 1 absorbs radiant heat and heats up for the first time, is then used as cold flow
Body enters the thermal energy progress secondary temperature elevation that heat exchanger 8 absorbs high-temp waste gas, is passed through in dry kiln eventually by dry air piping 7.
Gas medium recycles the heat radiation of the waste heat and kiln hood, kiln body of kiln tail gas.
Optionally, the air inside thermal radiation collection case 1 is introduced to heat exchanger 8, the gas of air inducing pipeline 4 for convenience
Channel is equipped with the first air-introduced machine 2, i.e., the first air-introduced machine is arranged between thermal radiation collection case 1 and the cold fluid inlet of heat exchanger 8
2, to improve heat exchange efficiency.
Optionally, in order to facilitate the discharge of exhaust gas, the gas passage of the hot fluid outlet ports of heat exchanger 8 is successively arranged second and draws
Blower 9 and chimney 10.That is the second air-introduced machine 9 is tightly connected by the hot fluid outlet ports of corresponding pipeline and heat exchanger 8, and will be given up
Gas is delivered to chimney 10 and is discharged.
Optionally, in a kind of embodiment provided by the present application, heat exchanger tube includes horizontal segment heat exchanger 13 and vertical section heat exchange
Device 14,14 one end of vertical section heat exchanger connect with kiln hood, the end of the other end and horizontal segment heat exchanger 13 connects, horizontal segment heat exchange
Device 13 is equipped with air blower 12 far from one end of vertical section heat exchanger 14.Specifically, horizontal segment heat exchanger 13 and vertical section heat exchanger
14 be the device for making material and air directly exchange heat, and the L-shaped distribution of the two.During the work time, Cryogenic air is in air blast
Passed sequentially through under the action of machine 12 horizontal segment heat exchanger 13, vertical section heat exchanger 14 enter rotary kiln 3 in carry out it is combustion-supporting.
It should be noted that the cooling material of the mode for generalling use water cooling in the prior art after obtaining clinker, in operation
When can generate a large amount of water mists, the waste for influencing production environment, also will cause cooling water.And the present embodiment is provided with air blower 12,
Clinker is exchanged heat and cooled down by air-cooled mode.Clinker can either be cooled down by the air of heat exchanger tube, can also be subtracted
The consumption of few cooling water, additionally it is possible to reduce rotary kiln energy consumption as combustion-supporting gas.
Further, in order to improve the heat exchange efficiency of clinker and air, in the present embodiment, horizontal segment heat exchanger 13 is that can turn
Dynamic tubular structure, and the inner sidewall of tubular structure is equipped with the helical blade for overturning material uniformly.Specifically, horizontal segment
The tubular structure preferably rounded using section of heat exchanger 13, while equipped with the transmission device that it can be driven to rotate；Tubular
The blade that the inner sidewall setting helical form of structure is arranged, overturns material uniformly, and then make what air contacted with clinker more to fill
Point, heat exchange efficiency is improved, while accelerating the cooling velocity of clinker.
It should be noted that horizontal segment heat exchanger 13 and/or vertical section heat exchanger 14 can be using made of carbon steel materials
Cylinder-like structure can also can make air directly contact progress with clinker using box typed structure or the structure of other forms
Heat exchange.In addition, the connection type of tubular structure and transmission device and control principle can refer to cooling circle in the prior art
Cylinder.
Optionally, the feed inlet of heat exchanger tube and gas outlet are set to the same end of vertical section heat exchanger 14, and heat exchanger tube goes out
Material mouth and air inlet are set to the same end of horizontal segment heat exchanger 13.That is, horizontal segment heat exchanger 13 and vertical section heat exchanger 14 are adopted
With the working method of counter-flow heat exchange, keep the heat exchange efficiency of clinker and air higher.
Optionally, the flow of gas is controlled for convenience, is equipped with high temperature draught fan 16 in the gas passage of hot air duct 17.
Optionally, cyclone dust collectors 15 are equipped between heat exchanger tube and high temperature draught fan 16.Specifically, cyclone dust collectors 15 are
Dust-extraction unit can reduce abrasion of the dust to upstream device and the pollution to environment, the specific structure of cyclone dust collectors 15
It can refer to the prior art.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Rotary kiln residual neat recovering system provided by the utility model is described in detail above.It is used herein
Specific case is expounded the principles of the present invention and embodiment, and the explanation of above example is only intended to help to manage
Solve the method and its core concept of the utility model.It should be pointed out that for those skilled in the art, not
Under the premise of being detached from the utility model principle, several improvements and modifications can be made to this utility model, these improve and repair
Decorations are also fallen into the protection scope of the utility model claims.
Claims (10)
1. a kind of rotary kiln residual neat recovering system characterized by comprising
Rotary kiln (3) with kiln hood and kiln tail, the kiln tail are equipped with the gas outlet for exhaust gas to be discharged, and the kiln hood is equipped with ripe
Material outlet and combustion-supporting gas import；
The zone of heat liberation of heat exchanger (8), the heat exchanger (8) is connected to the gas outlet of the kiln tail, the heat exchanger (8)
Cold fluid outlet is equipped with the drying air piping (7) for connecting with dry kiln air inlet；
Heat exchanger tube, the heat exchanger tube are equipped with feed inlet, air inlet and exhaust outlet, and the feed inlet of the heat exchanger tube goes out with the clinker
The gas outlet of mouth connection, the heat exchanger tube passes through hot air duct (17) and the combustion-supporting gas inlet communication.
2. rotary kiln residual neat recovering system according to claim 1, which is characterized in that the gas outlet of the kiln tail and described
Hot precipitator (6) are equipped between the hot fluid inlet of heat exchanger (8).
3. rotary kiln residual neat recovering system according to claim 2, which is characterized in that the hot precipitator (6) is gold
Belong to film high-temp. deduster；And/or the heat exchanger (8) is board-like air preheater.
4. rotary kiln residual neat recovering system according to claim 1, which is characterized in that be equipped with outside the rotary kiln (3)
The thermal radiation collection case (1) of the kiln hood is wrapped up, the thermal radiation collection case (1) is equipped with gas outlet；The heat exchanger (8) it is cold
Fluid inlet is connect by air inducing pipeline (4) with the gas outlet of the thermal radiation collection case (1).
5. rotary kiln residual neat recovering system according to claim 4, which is characterized in that the gas of the air inducing pipeline (4)
Channel is equipped with the first air-introduced machine (2)；And/or the gas passage of the hot fluid outlet ports of the heat exchanger (8) is successively arranged second and draws
Blower (9) and chimney (10) for discharge gas.
6. rotary kiln residual neat recovering system described in any one according to claim 1~5, which is characterized in that the heat exchanger tube
Including horizontal segment heat exchanger (13) and vertical section heat exchanger (14), described vertical section heat exchanger (14) one end and the kiln hood connect
It connects, the other end is connect with the end of the horizontal segment heat exchanger (13), the separate vertical section of the horizontal segment heat exchanger (13)
One end of heat exchanger (14) is equipped with air blower (12).
7. rotary kiln residual neat recovering system according to claim 6, which is characterized in that the horizontal segment heat exchanger (13) is
Rotatable tubular structure, and the inner sidewall of the tubular structure is equipped with the helical blade for overturning material uniformly.
8. rotary kiln residual neat recovering system according to claim 7, which is characterized in that the feed inlet of the heat exchanger tube and go out
Port is set to the same end of the vertical section heat exchanger (14), and the discharge port and air inlet of the heat exchanger tube are set to the water
The same end of flat section heat exchanger (13).
9. rotary kiln residual neat recovering system according to claim 6, which is characterized in that the gas of the hot air duct (17)
High temperature draught fan (16) are equipped in channel.
10. rotary kiln residual neat recovering system according to claim 9, which is characterized in that the heat exchanger tube and the high temperature
Cyclone dust collectors (15) are equipped between air-introduced machine (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821730459.7U CN209101827U (en) | 2018-10-24 | 2018-10-24 | A kind of rotary kiln residual neat recovering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821730459.7U CN209101827U (en) | 2018-10-24 | 2018-10-24 | A kind of rotary kiln residual neat recovering system |
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| Publication Number | Publication Date |
|---|---|
| CN209101827U true CN209101827U (en) | 2019-07-12 |
Family
ID=67156444
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821730459.7U Active CN209101827U (en) | 2018-10-24 | 2018-10-24 | A kind of rotary kiln residual neat recovering system |
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| Country | Link |
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| CN (1) | CN209101827U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109099718A (en) * | 2018-10-24 | 2018-12-28 | 株洲火炬工业炉有限责任公司 | A kind of rotary kiln residual neat recovering system |
| WO2022166925A1 (en) * | 2021-02-07 | 2022-08-11 | 中国恩菲工程技术有限公司 | Molybdenum oxide roasting system |
-
2018
- 2018-10-24 CN CN201821730459.7U patent/CN209101827U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109099718A (en) * | 2018-10-24 | 2018-12-28 | 株洲火炬工业炉有限责任公司 | A kind of rotary kiln residual neat recovering system |
| CN109099718B (en) * | 2018-10-24 | 2024-04-12 | 株洲火炬工业炉有限责任公司 | Rotary kiln waste heat recovery system |
| WO2022166925A1 (en) * | 2021-02-07 | 2022-08-11 | 中国恩菲工程技术有限公司 | Molybdenum oxide roasting system |
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Effective date of registration: 20211230 Address after: No.2, Renmin North Road, Zhuzhou City, Hunan Province, 412001 Patentee after: ZHUZHOU TORCH INDUSTRIAL FURNACE CO.,LTD. Address before: No.2, Renmin North Road, Shifeng District, Zhuzhou City, Hunan Province 412000 Patentee before: ZHUZHOU TORCH INDUSTRIAL FURNACE CO.,LTD. Patentee before: Beijing mining and Metallurgy Technology Group Co., Ltd |