CN204058259U - A kind of take coal dust as the roasting assembly of fuel - Google Patents
A kind of take coal dust as the roasting assembly of fuel Download PDFInfo
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- CN204058259U CN204058259U CN201420424225.5U CN201420424225U CN204058259U CN 204058259 U CN204058259 U CN 204058259U CN 201420424225 U CN201420424225 U CN 201420424225U CN 204058259 U CN204058259 U CN 204058259U
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- combustion chamber
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- coal dust
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
It take coal dust as the roasting assembly of fuel that the utility model relates to a kind of, comprises combustion chamber, cyclonic separator, calcining stove, waste heat boiler and generating set.Combustion chamber is provided with burner, secondary air entrance, high-temperature flue gas outlet, molten slag bath and slag notch.Burner is positioned at top or the sidepiece of combustion chamber, and secondary air entrance is positioned at the sidepiece of combustion chamber, and secondary air entrance is tangentially installed or radial installation.Waste heat boiler is provided with steam coils, and steam coils is connected with generating set.The exhanst gas outlet of combustion chamber is divided into two-way, and cyclonic separator of leading up to is connected to calcining stove, and another road is connected to waste heat boiler.The combustion chamber wall of combustion chamber is that laying fireproof bricks structure or laying fireproof bricks add water wall structure.The utility model is combined with calcining stove and generating set by external combustion chamber, make full use of the heating object material in the high-temperature flue gas heating and calcining stove that coal dust produces in combustion processes, efficiency utilization heat, reduces energy expenditure, improves the thermo-efficiency of device and the quality of calcination product.
Description
Technical field
The utility model belongs to chemical materials production unit technical field, relates to a kind of device of indirect heating calcining materials, and being specifically related to a kind of take coal dust as the roasting assembly of fuel.
Background technology
The firing system function singleness of prior art, a kind of calcining or heating of material can only be used for, existing burning boiler generally comprises body of heater, burner hearth, feeding unit, fire grate, is divided into upper lower combustion chamber and ash-falling chamber by fire grate, and fuel burns after entering combustion chamber above burner hearth.The shortcoming adopting this combustion system to exist is that thermo-efficiency is low, burning can not Thorough combustion, energy utilization is abundant not, and fuel is transported to combustion chamber from top to bottom, causes fuel pellet to burn insufficient, produce a large amount of cigarette, cause environmental pollution, and because the dirt fusing point of coal dust is lower, easy fouling, sticks on tank body, affect the thermal conduction of tank body, heat utilization efficiency be low, general without coal dust as fuel.
Authorization Notice No. is the Chinese utility model patent of 202869227U open a kind of " a kind of pulverized coal combustion system being applied to the external combustion chamber of sleeve kiln; comprise Pulverized Coal Bin; coal powder distribation gauger is installed in the below of Pulverized Coal Bin; coal powder distribation gauger is connected with fluidized air blower by fluidization air pipeline; coal powder distribation gauger is connected with the coal burner be arranged in the external combustion chamber of sleeve kiln by power transportation pipe, one end that power transportation pipe is positioned at coal powder distribation gauger is connected with coal dust conveying fan by conveying air line ".This utility model patent can realize coal dust single fire or coal dust, gas mixed burning, solve sleeve kiln and utilize the difficult problem that external combustion chamber and coal dust are fuel lime kilning, enter the coal dust amount of coal burner to reach the object regulating external burning room temp by adjustment simultaneously.But this patent can not adapt to the object that other type of furnace uses Pulverized Coal calcining materials.
Utility model content
It take coal dust as the roasting assembly of fuel that the purpose of this utility model is to provide a kind of, to adapt to various indirect heating calcining materials stove, reduces roasting assembly energy expenditure, improves thermo-efficiency, improve the thermo-efficiency of device and the quality of calcination product.
The technical solution of the utility model is: the roasting assembly taking coal dust as fuel, comprises combustion chamber, cyclonic separator, calcining stove, waste heat boiler and generating set.Combustion chamber is provided with burner, secondary air entrance, high-temperature flue gas outlet, molten slag bath and slag notch.Burner is positioned at top or the sidepiece of combustion chamber, and secondary air entrance is positioned at the sidepiece of combustion chamber, and secondary air entrance is tangentially installed or radial installation.Waste heat boiler is provided with steam coils, and steam coils is connected with generating set.The exhanst gas outlet of combustion chamber is divided into two-way, and cyclonic separator of leading up to is connected to calcining stove, and another road is connected to waste heat boiler.The combustion chamber wall of combustion chamber is that laying fireproof bricks structure or laying fireproof bricks add water wall structure.
Calcining stove is beam type kiln, sleeve kiln, rotary kiln, ring kiln or partition calcining furnace.Be divided into preheating zone, calcining zone and cooling zone in the kiln body of beam type kiln, preheating zone is provided with suction bar, calcining zone is provided with smoke inlet or air inlet beam, and cooling zone is provided with lower suction bar.Upper suction bar outlet is connected with exhaust emission system, and the entrance of smoke inlet or air inlet beam is connected with the outlet of cyclonic separator, and lower suction bar is connected with interchanger.
Partition calcining furnace is provided with calcining compartment and smoke chamber, and calcining compartment setting alternate with smoke chamber, separates with heat conduction brick between calcining compartment and smoke chamber.Smoke chamber is provided with inlet mouth and air outlet, and inlet mouth is connected with Cyclone outlet, and air outlet is connected with waste heat boiler.Calcining compartment is provided with charging opening, discharge port, decomposition gas outlet and tapping channel, and charging opening is communicated with charging vehicle, and discharge port is connected with tapping channel.Be provided with fan in calcining compartment, fan is connected with fan shaft.Device is provided with decomposition gas processing unit, and decomposition gas processing unit is provided with decomposition gas treating plant, decomposition gas cooling apparatus Sum decomposition gas storage tank, and decomposition gas treating plant, decomposition gas cooling apparatus Sum decomposition gas storage tank connect successively.Decomposition gas outlet is connected with decomposition gas treating plant.Tapping channel is provided with heat-eliminating medium entrance, and heat-eliminating medium entrance is connected with cooling medium circulation system.
Combustion chamber is vertical cylindrical structure or horizontal cylinder body structure, and the burner of vertical cylindrical structure combustion chamber is positioned at the top of combustion chamber, and high-temperature flue gas outlet is positioned at the bottom of combustion chamber.The burner of horizontal cylinder body structure combustion chamber is positioned at the side of combustion chamber, and high-temperature flue gas outlet is positioned at the opposite side of combustion chamber.Combustion chamber is provided with tertiary air entrance, and the tertiary air entrance of vertical cylindrical structure combustion chamber is positioned at the bottom of high-temperature flue gas outlet, and the tertiary air entrance of horizontal cylinder body structure combustion chamber is positioned at the top of high-temperature gas outlet.Secondary air entrance and/or tertiary air ingress are provided with assisted fuel nozzle, and assisted fuel nozzle is gas fuel nozzle, liquid fuel nozzle or solid fuel nozzle.First air entrance is connected with gas blower, oxygen enrichment pipeline or oxygen pipeline, and secondary air entrance is connected with gas blower, oxygen enrichment pipeline or oxygen pipeline, and tertiary air entrance is connected with gas blower, oxygen enrichment pipeline or oxygen pipeline.
Generating set is provided with steam turbine and generating set, and steam turbine is connected with generating set, and steam coils is connected with steam turbine.
The utility model is applicable to rubbish destructive distillation, coking, lime, forges the multiple uses such as white production and direct-reduced iron.Combustion chamber of the present utility model can slag tap, also can dry ash extraction.
The utility model is that the roasting assembly of fuel is combined with calcining stove and generating set by external combustion chamber with coal dust, make full use of the heating object material in the high-temperature flue gas heating and calcining stove that coal dust produces in combustion processes, efficiency utilization heat, reduce energy expenditure, improve the thermo-efficiency of device and the quality of calcination product.Adopt partition type of heating, make flue gas and material to be machined separately, reduce the objectionable impuritiess such as sulfureous in flue gas to the pollution of material to be machined, be conducive to improving the quality of products and collect decomposition gas by product.Partition calcining furnace is combined with steam driven generator, with waste heat generation steam, uses steam driven steam turbine, and steam turbine drive electrical generators generates electricity, and waste heat is utilized efficiently, is conducive to improving the economic and social benefits.Secondary air entrance, tertiary air entrance and assisted fuel nozzle are set and are conducive to overheavy firing effect, improve flue-gas temperature, improve the quality of calcination product.
Accompanying drawing explanation
The schematic flow sheet of Fig. 1 to be the utility model with coal dust be roasting assembly of fuel;
Fig. 2 is the structural representation of horizontal combustion chamber;
Fig. 3 is the schematic flow sheet of the utility model another program;
Fig. 4 is the A-A figure of Fig. 3.
Wherein:
1-fuel inlet, 2-First air entrance, 3-burner, 4-secondary air entrance, 5-combustion chamber, 6-molten slag bath, 7-slag notch, 8-combustion chamber wall, 9-high-temperature flue gas exports, 10-cyclonic separator, 11-valve, 12-upper suction bar, 13-beam type kiln, 14-air inlet beam, 15-lower suction bar, 16-exhanst gas outlet, 17-steam coils, 18-waste heat boiler, 19-inlet mouth, 20-smoke chamber, 21-air outlet, 22-partition calcining furnace, 23-blower fan, 24-calcining compartment, 25-fan, 26-tapping channel, 27-charging vehicle, 28-charging opening, 29-decomposition gas exports, 30-heat conduction brick, 31-discharge port, 32--heat-eliminating medium entrance, 33--decomposition gas processing unit, 34-tertiary air entrance, 35-assisted fuel nozzle.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in detail.The utility model protection domain is not limited to embodiment, and those skilled in the art make the scope that any change also belongs to the utility model protection in the scope that claim limits.
Embodiment 1
The utility model with coal dust be the roasting assembly of fuel as shown in Figure 1, comprise combustion chamber 5, cyclonic separator 10, beam type kiln 13, waste heat boiler 18 and generating set.Combustion chamber 5 is vertical cylindrical structure, and the combustion chamber wall 8 of combustion chamber adds water wall structure for laying fireproof bricks.Combustion chamber is provided with burner 3, secondary air entrance 4, high-temperature flue gas outlet 9, tertiary air entrance 34, molten slag bath 6 and slag notch 7, and burner is positioned at the top of combustion chamber, and high-temperature flue gas outlet 9 and slag notch are positioned at the bottom of combustion chamber.Burner is provided with fuel inlet 1 and First air entrance 2, and fuel inlet is connected with coal dust transfer line, and First air entrance is connected with gas blower.Secondary air entrance 4 is positioned at the sidepiece of combustion chamber, and secondary air entrance is tangentially installed, and tertiary air entrance is positioned at the bottom of high-temperature flue gas outlet 9, and secondary air entrance is connected with gas blower respectively with tertiary air entrance.Secondary air entrance and tertiary air ingress are provided with assisted fuel nozzle 35, and the assisted fuel nozzle of secondary air ingress is liquid fuel nozzle, and the assisted fuel nozzle of tertiary air ingress is gas fuel nozzle.Beam type kiln 13 is provided with opening for feed, discharge port and cooling air inlet.Be divided into preheating zone, calcining zone and cooling zone in the kiln body in limestone kiln, preheating zone is provided with suction bar 12, calcining zone is provided with air inlet beam 14, cooling zone is provided with lower suction bar 15.Lower suction bar is connected with air heat exchanger, and upper suction bar outlet is connected with exhaust emission system, and exhaust emission system comprises fuel heat exchangers, fly-ash separator, induced draft fan and chimney.The exhanst gas outlet of combustion chamber is divided into two-way, and cyclonic separator of leading up to is connected to the air inlet beam entrance of calcining stove, and another road is connected to waste heat boiler, and two-way connecting pipeline is provided with valve 11.Generating set is provided with steam turbine and generating set, and steam turbine is connected with generating set, and steam coils 17 is connected with steam turbine.Waste heat boiler is provided with steam coils 17, and steam coils is connected with steam turbine by vapour line.
Horizontal cylinder body structure can be selected in combustion chamber 5, and as shown in Figure 2, the burner 3 of horizontal cylinder body structure combustion chamber 5 is positioned at the side of combustion chamber, and high-temperature flue gas outlet 9 is positioned at the opposite side of combustion chamber.Secondary air entrance is positioned at the bottom of combustion chamber, and secondary air entrance radial direction is installed.Tertiary air entrance is positioned at the top of high-temperature gas outlet.
The utility model take coal dust as the operation scheme of the roasting assembly of fuel is that limestone material enters the preheating zone of beam type kiln 13 through opening for feed, after the preheating of preheating zone to calcining zone calcining, the lime be sintered into cooling zone cooling after through discharge port kiln discharge.Combustion chamber sprays into coal dust by the coal powder entrance of burner, and First air entrance enters air, blasts secondary air carry out combustion-supporting burning along combustion chamber wall high speed rotating with tangential way, makes coal dust firing efficiently abundant.Tertiary air entrance, as combustion air entrance for subsequent use, when the combustion air that First air entrance and secondary air entrance enter is not enough, enters supplementary combustion air from tertiary air entrance.The auxiliary fuel spout of secondary air ingress and tertiary air ingress sprays fuel as required, with overheavy firing effect, improves flue-gas temperature.The slag produced in process of coal combustion exists in liquid form in burner hearth, and molten slag flow to the bottom slag bath of burner hearth along furnace wall, discharged by slag notch 7.The high-temperature flue gas that combustion chambers burn produces 9 is divided into two-way through high-temperature flue gas outlet, and a road, after cyclonic separator 10 dedusting, enters the calcining zone of beam type kiln 13 through air inlet beam 14, another road through connecting pipeline to waste heat boiler 18.High-temperature flue gas at beam type kiln calcining zone calcined limestone material, then upwards with preheating zone Wingdale heat exchange after, discharge through upper suction bar 12.Enter the flue gas heating steam coils of waste heat boiler, steam occurs, steam drives steam turbine to rotate through vapour line, and drive electrical generators group generates electricity.Useless flue gas discharges to exhaust emission system through exhanst gas outlet 16.Two-way flue gas flow is regulated by the valve 11 on connecting pipeline.
Embodiment 2
Another embodiment of the utility model as shown in Figure 3, Figure 4, comprise combustion chamber 5, cyclonic separator 10, partition calcining furnace 22, decomposition gas processing unit 33 and generating set, partition calcining furnace is for the production of fat lime product and reclaim the high-pureness carbon dioxide gas of by-product.Combustion chamber 5 is vertical cylindrical structure, and the combustion chamber wall 8 of combustion chamber is laying fireproof bricks structure.Burner is provided with fuel inlet 1 and First air entrance 2, and fuel inlet is connected with coal dust transfer line, and First air entrance 2 is connected with gas blower with tertiary air entrance 34, and secondary air entrance 4 is connected with oxygen enrichment pipeline.The assisted fuel nozzle 35 of secondary air ingress is liquid fuel nozzle, and the assisted fuel nozzle of tertiary air ingress is gas fuel nozzle.Partition calcining furnace is provided with calcining compartment 24 and smoke chamber 20, and calcining compartment setting alternate with smoke chamber, separates with heat conduction brick between calcining compartment and smoke chamber.Smoke chamber is provided with inlet mouth 19 and air outlet 21, and calcining compartment is provided with charging opening 28, discharge port 31 Sum decomposition pneumatic outlet 29.Charging opening is communicated with charging vehicle 27, and discharge port is connected with tapping channel 26.Be provided with fan 25 in calcining compartment, fan is connected with blower fan 23 axle.Tapping channel 26 is provided with heat-eliminating medium entrance 32, and heat-eliminating medium entrance is connected with cooling medium circulation system, makes heat-eliminating medium with the carbonic acid gas decomposed.The exhanst gas outlet of combustion chamber is divided into two-way, and cyclonic separator of leading up to is connected to the inlet mouth 19 of partition calcining furnace, and partition calcining furnace air outlet 21 is connected with waste heat boiler 18, and another road is directly connected to waste heat boiler, and two-way connecting pipeline is provided with valve 11.Decomposition gas processing unit is provided with decomposition gas treating plant, decomposition gas cooling apparatus Sum decomposition gas storage tank, and decomposition gas treating plant, decomposition gas cooling apparatus Sum decomposition gas storage tank connect successively.Decomposition gas outlet 29 is connected with decomposition gas treating plant.
Utilize partition calcining furnace to produce fat lime product and reclaim high-pureness carbon dioxide gas process and be, limestone material enters calcining compartment 24 through charging vehicle 27 and charging opening 28, the high-temperature flue gas produced by combustion chamber 5 coal dust firing enters smoke chamber 20 after cyclonic separator 10 dedusting, by the material of heat conduction brick 30 partition heating and calcining room, Wingdale pyrolytic decomposition becomes lime and carbonic acid gas, carbonic acid gas rises gradually, materials downward is penetrated by the fans drive at top, produce the airflow circulation of carbonic acid gas at material burner hearth, increase the heating efficiency of partition kiln.Lime enters tapping channel 26 through discharge port 31, and heat-eliminating medium carbonic acid gas warp-heat-eliminating medium entrance 32 enters tapping channel cool lime, and cooled lime is come out of the stove.High temperature carbon dioxide after cool lime enters calcining compartment with decomposing together with the carbonic acid gas that produces and export 29 to decomposition gas processing unit processes through decomposition gas, and heat-eliminating medium is made in the carbonic acid gas part continuation circulation after process, a part of as secondary providing device.Another road of combustion chamber high temperature flue gas directly enters waste heat boiler 18 through connecting pipeline and steam occurs, and drives power generation, according to need of production, is regulated the flow of two-way flue gas by the valve 11 on connecting pipeline.The structure of combustion chamber 5 is identical with embodiment 1 with operation.
Claims (10)
1. one kind take coal dust as the roasting assembly of fuel, comprise combustion chamber (5), cyclonic separator (10), calcining stove, waste heat boiler (18) and generating set, it is characterized in that: described combustion chamber is provided with burner (3), secondary air entrance (4), high-temperature flue gas outlet (9), molten slag bath (6) and slag notch (7), described burner is positioned at top or the sidepiece of combustion chamber, described secondary air entrance is positioned at the sidepiece of combustion chamber, and secondary air entrance is tangentially installed or radial installation; Described waste heat boiler is provided with steam coils (17), and described steam coils is connected with generating set; The high-temperature flue gas outlet of described combustion chamber is divided into two-way, and cyclonic separator of leading up to is connected to calcining stove, and another road is connected to waste heat boiler; The combustion chamber wall (8) of described combustion chamber adds water wall structure for laying fireproof bricks structure or laying fireproof bricks.
2. according to claim 1 take coal dust as the roasting assembly of fuel, it is characterized in that: described calcining stove is beam type kiln (13), sleeve kiln, rotary kiln, ring kiln or partition calcining furnace (22).
3. according to claim 2 take coal dust as the roasting assembly of fuel, it is characterized in that: in the kiln body of described beam type kiln (13), be divided into preheating zone, calcining zone and cooling zone, described preheating zone is provided with suction bar (12), described calcining zone is provided with smoke inlet or air inlet beam (14), and described cooling zone is provided with lower suction bar (15); Described upper suction bar outlet is connected with exhaust emission system, and the entrance of described smoke inlet or air inlet beam is connected with the outlet of cyclonic separator, and described lower suction bar is connected with interchanger.
4. according to claim 2 take coal dust as the roasting assembly of fuel, it is characterized in that: described partition calcining furnace (22) is provided with calcining compartment (24) and smoke chamber (20), calcining compartment setting alternate with smoke chamber, separates with heat conduction brick (30) between calcining compartment and smoke chamber; Described smoke chamber is provided with inlet mouth (19) and air outlet (21), and inlet mouth is connected with Cyclone outlet, and air outlet is connected with waste heat boiler; Described calcining compartment is provided with charging opening (28), discharge port (31), decomposition gas outlet (29) and tapping channel (26), and charging opening is communicated with charging vehicle (27), and discharge port is connected with tapping channel (26); Fan (25) is provided with in calcining compartment.
5. according to claim 4 take coal dust as the roasting assembly of fuel, it is characterized in that: described device is provided with decomposition gas processing unit (33), decomposition gas processing unit is provided with decomposition gas treating plant, decomposition gas cooling apparatus Sum decomposition gas storage tank, and decomposition gas treating plant, decomposition gas cooling apparatus Sum decomposition gas storage tank connect successively; Described decomposition gas outlet (29) is connected with decomposition gas treating plant.
6. according to claim 4 take coal dust as the roasting assembly of fuel, and it is characterized in that: described tapping channel (26) is provided with heat-eliminating medium entrance (32), described heat-eliminating medium entrance is connected with cooling medium circulation system.
7. according to claim 1 take coal dust as the roasting assembly of fuel, it is characterized in that: described combustion chamber (5) are vertical cylindrical structure or horizontal cylinder body structure, the burner (3) of described vertical cylindrical structure combustion chamber is positioned at the top of combustion chamber, and high-temperature flue gas outlet (9) is positioned at the bottom of combustion chamber; The burner of described horizontal cylinder body structure combustion chamber is positioned at the side of combustion chamber, and high-temperature flue gas outlet is positioned at the opposite side of combustion chamber.
8. according to claim 7 take coal dust as the roasting assembly of fuel, it is characterized in that: described combustion chamber (5) are provided with tertiary air entrance (34), the tertiary air entrance of vertical cylindrical structure combustion chamber is positioned at the bottom of high-temperature flue gas outlet (9), and the tertiary air entrance of horizontal cylinder body structure combustion chamber is positioned at the top of high-temperature gas outlet.
9. according to claim 8 take coal dust as the roasting assembly of fuel, it is characterized in that: described secondary air entrance (4) and/or tertiary air entrance (34) place are provided with assisted fuel nozzle (35), and described assisted fuel nozzle is gas fuel nozzle, liquid fuel nozzle or solid fuel nozzle; Described First air entrance (2) is connected with gas blower, oxygen enrichment pipeline or oxygen pipeline, and secondary air entrance is connected with gas blower, oxygen enrichment pipeline or oxygen pipeline, and tertiary air entrance is connected with gas blower, oxygen enrichment pipeline or oxygen pipeline.
10. according to claim 1 take coal dust as the roasting assembly of fuel, and it is characterized in that: described generating set is provided with steam turbine and generating set, and steam turbine is connected with generating set, described steam coils (17) is connected with steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424225.5U CN204058259U (en) | 2014-07-30 | 2014-07-30 | A kind of take coal dust as the roasting assembly of fuel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424225.5U CN204058259U (en) | 2014-07-30 | 2014-07-30 | A kind of take coal dust as the roasting assembly of fuel |
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| CN204058259U true CN204058259U (en) | 2014-12-31 |
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| CN201420424225.5U Active CN204058259U (en) | 2014-07-30 | 2014-07-30 | A kind of take coal dust as the roasting assembly of fuel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104129930A (en) * | 2014-07-30 | 2014-11-05 | 石家庄新华能源环保科技股份有限公司 | Calcining apparatus with powder coal as fuel |
| CN105776916A (en) * | 2016-03-13 | 2016-07-20 | 石家庄新华能源环保科技股份有限公司 | Low-carbon-emission cement production device |
-
2014
- 2014-07-30 CN CN201420424225.5U patent/CN204058259U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104129930A (en) * | 2014-07-30 | 2014-11-05 | 石家庄新华能源环保科技股份有限公司 | Calcining apparatus with powder coal as fuel |
| CN105776916A (en) * | 2016-03-13 | 2016-07-20 | 石家庄新华能源环保科技股份有限公司 | Low-carbon-emission cement production device |
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