CN107487994B - Clinker cooler waste heat recovery rotary kiln oxygen supply system - Google Patents
Clinker cooler waste heat recovery rotary kiln oxygen supply system Download PDFInfo
- Publication number
- CN107487994B CN107487994B CN201710714709.1A CN201710714709A CN107487994B CN 107487994 B CN107487994 B CN 107487994B CN 201710714709 A CN201710714709 A CN 201710714709A CN 107487994 B CN107487994 B CN 107487994B
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- rotary kiln
- curing
- cylinder
- cement
- pulverized coal
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4492—Inhibiting the formation of or eliminating incrustations in the cement kiln
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
- C04B7/4415—Waste hot gases
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a clinker cooler waste heat recovery rotary kiln oxygen supply system, which comprises a curing rotary kiln cylinder and a gas combustion heating cylinder arranged in the curing rotary kiln cylinder, wherein the downstream end of the gas combustion heating cylinder is communicated with a pulverized coal air mixing pipeline, and the downstream end of the curing rotary kiln cylinder is communicated with a cement clinker cooling bin; the upstream end of the cement clinker cooling bin is communicated with a clinker cooling blast pipe, the downstream end of the cement clinker cooling bin is communicated with a dust input end of a cement clinker electric dust collector, and a tail gas discharge end of the cement clinker electric dust collector is communicated with the pulverized coal air mixing pipeline. The invention provides a clinker cooler waste heat recovery rotary kiln oxygen supply system which can uniformly heat cement raw materials, thereby reducing the energy consumption of a cement curing rotary kiln and fully recycling the waste heat of the calcination tail gas of the cement curing rotary kiln.
Description
Technical Field
The invention relates to the technical field of cement production process equipment, in particular to a clinker cooler waste heat recovery rotary kiln oxygen supply system.
Background
In the production process of cement, firstly, mixing cement raw materials according to a process proportion, then putting the cement raw materials into a cement rotary kiln, and calcining the cement mixed raw materials to prepare cement clinker; therefore, the cement curing rotary kiln is one of the core devices in the cement production process, and simultaneously, the cement curing rotary kiln is a process with the highest energy consumption in the cement production process. The rotary cement kiln in the prior art. In the prior art, the cement mixed raw material in the cement rotary kiln is easy to agglomerate and adhere in the calcining process, so that the cement calcining process has the condition of supersaturation of heating, the calcining heat consumption of the cement raw material is increased, the cement raw material is heated unevenly, and the energy consumption of the cement curing rotary kiln is increased.
In addition, the waste heat recycling of the calcining tail gas of the cement curing rotary kiln is also a main method and a key research project for reducing the energy consumption of the rotary kiln at present. Therefore, it is necessary to design a new cement curing rotary kiln, which can uniformly heat the cement raw meal, thereby reducing the energy consumption of the cement curing rotary kiln, and fully recycle the residual heat of the calcination tail gas of the cement curing rotary kiln.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a clinker cooler waste heat recovery rotary kiln oxygen supply system which can uniformly heat cement raw materials, thereby reducing the energy consumption of a cement curing rotary kiln and fully recycling the waste heat of the calcination tail gas of the cement curing rotary kiln.
The technical scheme adopted by the invention for solving the technical problems is as follows:
A clinker cooler waste heat recovery rotary kiln oxygen supply system comprises a curing rotary kiln cylinder and a gas combustion heating cylinder arranged in the curing rotary kiln cylinder, wherein the downstream end of the gas combustion heating cylinder is communicated with a pulverized coal air mixing pipeline, and the downstream end of the curing rotary kiln cylinder is communicated with a cement clinker cooling bin; the upstream end of the cement clinker cooling bin is communicated with a clinker cooling blast pipe, the downstream end of the cement clinker cooling bin is communicated with a dust input end of a cement clinker electric dust collector, and a tail gas discharge end of the cement clinker electric dust collector is communicated with the pulverized coal air mixing pipeline.
As a further improvement of the above technical scheme, the upstream end of the gas combustion heating cylinder is communicated with a heating tail gas discharge pipeline, the pulverized coal air mixing pipeline is connected with a pulverized coal fuel input funnel and a combustion-supporting blower, a pulverized coal fuel feeding screw rod is arranged in the pulverized coal fuel input funnel, and the pulverized coal fuel input funnel and the pulverized coal fuel feeding screw rod are both vertically arranged; one end of an air outlet of the combustion-supporting air blower is connected with the pulverized coal air mixing pipeline, and one end of an air inlet of the combustion-supporting air blower is communicated with a tail gas discharge end of the cement clinker electric dust collector.
as a further improvement of the technical scheme, the curing rotary kiln cylinder is provided with openings at two axial ends, the upstream end of the curing rotary kiln cylinder is provided with a rotary kiln upstream mounting seat, the downstream end of the curing rotary kiln cylinder is provided with a rotary kiln downstream mounting seat, the top of the rotary kiln upstream mounting seat is provided with a cement raw material feeding port, and the bottom of the rotary kiln downstream mounting seat is provided with a cement clinker discharging port.
As a further improvement of the technical scheme, a cement raw material feeding hopper is arranged above the cement raw material feeding port, and the cement clinker discharging port is communicated with the top of the upstream end of the cement clinker cooling bin; one end of the clinker cooling blast pipe is connected with the cement clinker cooling bin, and the other end of the clinker cooling blast pipe is connected with a clinker cooling blower.
As a further improvement of the technical scheme, a kiln cylinder rotary support ring is arranged on the outer side of the curing rotary kiln cylinder, the kiln cylinder rotary support ring is positioned between the rotary kiln upstream mounting seat and the rotary kiln downstream mounting seat, the kiln cylinder rotary support ring is coaxially sleeved on the curing rotary kiln cylinder, a plurality of kiln cylinder rotary driving wheels are arranged on the inner side of the kiln cylinder rotary support ring, the roller surfaces of the kiln cylinder rotary driving wheels are tightly attached to the outer side surface of the curing rotary kiln cylinder, and the axes of the kiln cylinder rotary driving wheels are parallel to the axis of the curing rotary kiln cylinder.
As a further improvement of the above technical solution, the gas combustion heating cylinder is coaxially arranged with the curing rotary kiln cylinder, the outer diameter of the calcining and conveying helical blade is equal to the inner diameter of the curing rotary kiln cylinder, the inner diameter of the calcining and conveying helical blade is equal to the outer diameter of the gas combustion heating cylinder, and the calcining and conveying helical blade is fixedly arranged on the inner side wall of the curing rotary kiln cylinder.
Compared with the prior art, the invention has the beneficial effects that:
According to the clinker cooler waste heat recovery rotary kiln oxygen supply system provided by the invention, the calcination conveying helical blade is arranged, and the calcination conveying helical blade synchronously rotates along with the curing rotary kiln cylinder, so that the phenomenon of caking and adhesion of cement mixed raw materials in the calcination process can be avoided, the calcination heat consumption of the cement raw materials is reduced, the cement raw materials are uniformly heated, and the energy consumption of the cement curing rotary kiln is reduced; and the tail gas discharge end of the cement clinker electric dust collector is communicated with the pulverized coal air mixing pipeline, so that the residual heat of the calcined tail gas of the cement curing rotary kiln can be fully recycled.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a clinker cooler waste heat recovery rotary kiln oxygen supply system.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the present invention.
As shown in fig. 1, the clinker cooler waste heat recovery rotary kiln oxygen supply system comprises a curing rotary kiln cylinder 1 and a gas combustion heating cylinder 2 arranged in the curing rotary kiln cylinder 1, wherein the downstream end of the gas combustion heating cylinder 2 is communicated with a pulverized coal air mixing pipeline 3, and the downstream end of the curing rotary kiln cylinder 1 is communicated with a cement clinker cooling bin 4; the upstream end of the cement clinker cooling bin 4 is communicated with a clinker cooling blast pipe 5, the downstream end of the cement clinker cooling bin 4 is communicated with a dust input end of a cement clinker electric dust collector 6, and a tail gas discharge end of the cement clinker electric dust collector 6 is communicated with the pulverized coal air mixing pipeline 3.
Preferably, the upstream end of the gas combustion heating cylinder 2 is communicated with a heating tail gas discharge pipeline 7, the pulverized coal air mixing pipeline 3 is connected with a pulverized coal fuel input funnel 8 and a combustion-supporting blower 9, a pulverized coal fuel feeding screw 10 is arranged in the pulverized coal fuel input funnel 8, and the pulverized coal fuel input funnel 8 and the pulverized coal fuel feeding screw 10 are both vertically arranged; one end of an air outlet of the combustion-supporting air blower 9 is connected with the pulverized coal air mixing pipeline 3, and one end of an air inlet of the combustion-supporting air blower 9 is communicated with a tail gas discharge end of the cement clinker electric dust collector 6. The axial both ends opening of curing rotary kiln section of thick bamboo 1, just the upstream end of curing rotary kiln section of thick bamboo 1 is provided with rotary kiln upper reaches mount pad 11, the downstream end of curing rotary kiln section of thick bamboo 1 is provided with rotary kiln lower reaches mount pad 12, the top of rotary kiln upper reaches mount pad 11 is provided with cement raw material dog-house 13, the bottom of rotary kiln lower reaches mount pad 12 is provided with cement clinker bin outlet 14. The pulverized coal fuel feeding screw 10 is arranged, so that the feeding speed of pulverized coal can be controlled, and simultaneously, gas in the pulverized coal air mixing pipeline 3 can be prevented from leaking out of the pulverized coal fuel input funnel 8.
Preferably, a cement raw material feeding hopper 15 is arranged above the cement raw material feeding port 13, and the cement clinker discharging port 14 is communicated with the top of the upstream end of the cement clinker cooling bin 4; one end of the clinker cooling blast pipe 5 is connected with the cement clinker cooling bin 4, and the other end of the clinker cooling blast pipe 5 is connected with a clinker cooling blower 16. The outer side of the curing rotary kiln cylinder 1 is provided with a kiln cylinder rotary support ring 17, the kiln cylinder rotary support ring 17 is positioned between the rotary kiln upstream mounting seat 11 and the rotary kiln downstream mounting seat 12, the kiln cylinder rotary support ring 17 is coaxially sleeved on the curing rotary kiln cylinder 1, the inner side of the kiln cylinder rotary support ring 17 is provided with a plurality of kiln cylinder rotary driving wheels 18, the roller surfaces of the kiln cylinder rotary driving wheels 18 are tightly attached to the outer side surface of the curing rotary kiln cylinder 1, and the axes of the kiln cylinder rotary driving wheels 18 are parallel to the axis of the curing rotary kiln cylinder 1.
Preferably, the device further comprises a calcining and conveying helical blade 19 arranged between the curing rotary kiln cylinder 1 and the gas combustion heating cylinder 2, the gas combustion heating cylinder 2 and the curing rotary kiln cylinder 1 are coaxially arranged, the outer diameter of the calcining and conveying helical blade 19 is equal to the inner diameter of the curing rotary kiln cylinder 1, the inner diameter of the calcining and conveying helical blade 19 is equal to the outer diameter of the gas combustion heating cylinder 2, and the calcining and conveying helical blade 19 is fixedly arranged on the inner side wall of the curing rotary kiln cylinder 1.
In operation, cement raw materials are firstly fed into the rotary kiln upstream mounting seat 11 through the cement raw material feeding hopper 15, are carried into the curing rotary kiln barrel 1 through the calcining conveying helical blade 19 and are calcined into clinker, then enter the rotary kiln downstream mounting seat 12, are discharged from the cement clinker discharging port 14, and enter the cement clinker cooling bin 4 for cooling.
Cooling air in the cement clinker cooling bin 4 is extracted from the outside air by the clinker cooling blast pipe 5 and the clinker cooling blower 16, the cooling air heated in the cement clinker cooling bin 4 enters the cement clinker electric dust collector 6 along with clinker dust, then the dust is separated from hot air, and the hot air enters the pulverized coal air mixing pipeline 3 through the combustion-supporting blower 9, so that waste heat in the cement clinker cooling bin 4 can be recycled.
While the preferred embodiments of the present invention have been illustrated and described, it will be appreciated that the invention may be embodied otherwise than as specifically described and that equivalent alterations and modifications, which may be effected thereto by those skilled in the art without departing from the spirit of the invention, are deemed to be within the scope and spirit of the invention.
Claims (4)
1. The utility model provides a grog cooler waste heat recovery revolves kiln oxygen system which characterized in that: the device comprises a curing rotary kiln cylinder (1) and a gas combustion heating cylinder (2) arranged in the curing rotary kiln cylinder (1), wherein the downstream end of the gas combustion heating cylinder (2) is communicated with a pulverized coal-air mixing pipeline (3), and the downstream end of the curing rotary kiln cylinder (1) is communicated with a cement clinker cooling bin (4); the upstream end of the cement clinker cooling bin (4) is communicated with a clinker cooling blast pipe (5), the downstream end of the cement clinker cooling bin (4) is communicated with a dust input end of a cement clinker electric dust collector (6), and a tail gas discharge end of the cement clinker electric dust collector (6) is communicated with the pulverized coal air mixing pipeline; the upper stream end of the gas combustion heating cylinder (2) is communicated with a heating tail gas discharge pipeline (7), the pulverized coal air mixing pipeline (3) is connected with a pulverized coal fuel input funnel (8) and a combustion-supporting blower (9), a pulverized coal fuel feeding screw (10) is arranged in the pulverized coal fuel input funnel (8), the pulverized coal fuel input funnel (8) and the pulverized coal fuel feeding screw (10) are both vertically arranged, and the pulverized coal fuel feeding screw (10) can control the feeding speed of pulverized coal and simultaneously can prevent gas in the pulverized coal air mixing pipeline (3) from leaking out of the pulverized coal fuel input funnel (8); one end of an air outlet of the combustion-supporting air blower (9) is connected with the pulverized coal air mixing pipeline (3), and one end of an air inlet of the combustion-supporting air blower (9) is communicated with a tail gas discharge end of the cement clinker electrical dust collector (6); curing rotary kiln section of thick bamboo (1) with be provided with between gas combustion heating section of thick bamboo (2) and calcine conveying helical blade (19), gas combustion heating section of thick bamboo (2) with curing rotary kiln section of thick bamboo (1) coaxial setting, just calcine conveying helical blade's (19) external diameter with curing rotary kiln section of thick bamboo's (1) internal diameter equals, calcine conveying helical blade's (19) internal diameter with gas combustion heating section of thick bamboo's (2) external diameter equals, calcine conveying helical blade (19) fixed set up in on the inside wall of curing rotary kiln section of thick bamboo (1).
2. The clinker cooler waste heat recovery rotary kiln oxygen supply system of claim 1, which is characterized in that: the axial both ends opening of a curing rotary kiln section of thick bamboo (1), just the upstream end of a curing rotary kiln section of thick bamboo (1) is provided with rotary kiln upper reaches mount pad (11), the low reaches end of a curing rotary kiln section of thick bamboo (1) is provided with rotary kiln low reaches mount pad (12), the top of rotary kiln upper reaches mount pad (11) is provided with cement raw material dog-house (13), the bottom of rotary kiln low reaches mount pad (12) is provided with cement clinker bin outlet (14).
3. The clinker cooler waste heat recovery rotary kiln oxygen supply system of claim 2, which is characterized in that: a cement raw material feeding hopper (15) is arranged above the cement raw material feeding port (13), and the cement clinker discharging port (14) is communicated with the top of the upstream end of the cement clinker cooling bin (4); one end of the clinker cooling blast pipe (5) is connected with the cement clinker cooling bin (4), and the other end of the clinker cooling blast pipe (5) is connected with a clinker cooling blower (16).
4. The clinker cooler waste heat recovery rotary kiln oxygen supply system of claim 3, which is characterized in that: the outer side of the curing rotary kiln cylinder (1) is provided with a kiln cylinder rotary support ring (17), the kiln cylinder rotary support ring (17) is located between the rotary kiln upstream mounting seat (11) and the rotary kiln downstream mounting seat (12), the kiln cylinder rotary support ring (17) is coaxially sleeved on the curing rotary kiln cylinder (1), the inner side of the kiln cylinder rotary support ring (17) is provided with a plurality of kiln cylinder rotary driving wheels (18), the roller surfaces of the kiln cylinder rotary driving wheels (18) are tightly attached to the outer side surface of the curing rotary kiln cylinder (1), and the axis of the kiln cylinder rotary driving wheels (18) is parallel to the axis of the curing rotary kiln cylinder (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714709.1A CN107487994B (en) | 2017-08-19 | 2017-08-19 | Clinker cooler waste heat recovery rotary kiln oxygen supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714709.1A CN107487994B (en) | 2017-08-19 | 2017-08-19 | Clinker cooler waste heat recovery rotary kiln oxygen supply system |
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| Publication Number | Publication Date |
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| CN107487994A CN107487994A (en) | 2017-12-19 |
| CN107487994B true CN107487994B (en) | 2019-12-10 |
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| CN201710714709.1A Active CN107487994B (en) | 2017-08-19 | 2017-08-19 | Clinker cooler waste heat recovery rotary kiln oxygen supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108870990A (en) * | 2018-05-16 | 2018-11-23 | 江苏群达机械科技有限公司 | A kind of energy-saving environment protection air heater |
| CN108787117A (en) * | 2018-07-25 | 2018-11-13 | 安徽卓煌机械设备有限公司 | A kind of screw cement chamotte crushing device |
| CN108787121A (en) * | 2018-07-27 | 2018-11-13 | 安徽卓煌机械设备有限公司 | A kind of clinker scratch system |
| CN113149482A (en) * | 2021-05-25 | 2021-07-23 | 中国华能集团清洁能源技术研究院有限公司 | System for treating waste fan blade in rotary kiln and working method thereof |
| CN115010389B (en) * | 2022-08-01 | 2022-11-22 | 云南宜良西南水泥有限公司 | Cement production line capable of improving heat source utilization rate |
| CN116202313A (en) * | 2023-03-08 | 2023-06-02 | 江苏鹏飞集团股份有限公司 | Low-carbon lithium mineral roasting rotary kiln equipment with waste heat recovery |
| CN117146605A (en) * | 2023-10-27 | 2023-12-01 | 云南芒市西南水泥有限公司 | Cement clinker production waste heat recovery device |
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| CN202041081U (en) * | 2011-01-21 | 2011-11-16 | 江苏瑞泰重型机械有限公司 | Separate air channel structure for dry cement kiln |
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|---|---|---|---|---|
| CN201666725U (en) * | 2010-02-03 | 2010-12-08 | 吉林省建筑材料工业设计研究院 | Internal helical tube type rotary kiln |
| CN202041081U (en) * | 2011-01-21 | 2011-11-16 | 江苏瑞泰重型机械有限公司 | Separate air channel structure for dry cement kiln |
| CN103604304A (en) * | 2013-11-22 | 2014-02-26 | 中国矿业大学(北京) | Energy-efficient reduction rotary furnace |
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| CN107487994A (en) | 2017-12-19 |
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Effective date of registration: 20191114 Address after: 364100 Xikeng, Lianzhong village, Longtan Town, Yongding District, Longyan City, Fujian Province Applicant after: Fujian Yongding Minfu building materials Co., Ltd Address before: 241080 South of Wutong Road, Sanshan District, Wuhu City, Anhui Province Applicant before: Anhui Zhuohuang Machinery Equipment Co., Ltd. |
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