CN210862210U - Cement system of firing based on pure oxygen burning - Google Patents
Cement system of firing based on pure oxygen burning Download PDFInfo
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- CN210862210U CN210862210U CN201921298022.5U CN201921298022U CN210862210U CN 210862210 U CN210862210 U CN 210862210U CN 201921298022 U CN201921298022 U CN 201921298022U CN 210862210 U CN210862210 U CN 210862210U
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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
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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
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/18—Carbon capture and storage [CCS]
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Abstract
The utility model provides a based on pure oxygenThe system comprises a pure oxygen preparation device, an oxygen delivery pipe, a rotary kiln, a tertiary air pipe, a decomposing furnace, a kiln tail preheater, a high-temperature fan, a tail gas treatment device, and CO2The device comprises a collecting device, a cooler, a blower, a cooler hot air pipe, a cooler residual air pipe, a residual heat recovery device and a heat exchanger. The utility model discloses a mode of heat exchange heats the pure oxygen of participating in the burning, improves combustion efficiency, simultaneously the utility model discloses the high temperature pure oxygen that will produce divides three routes to enter into combustion system, promotes combustion temperature, reduces the flue gas volume to reduce cement and burn the heat consumption.
Description
Technical Field
The utility model belongs to cement preparation field, in particular to cement system of firing based on pure oxygen burning.
Background
The cement is a powdery hydraulic inorganic cementing material; water is added and stirred to form slurry which can be hardened in the air or in water, and sand, stone and other materials can be firmly cemented together, and the slurry is generally used in the construction industry; during production of cement, various materials such as limestone, clay, iron ore and coal are mostly crushed and fired.
The existing cement burning system adopts the mode of blowing air during burning to provide the oxygen required by burning, the burning mode has low burning efficiency, simultaneously, in order to meet the burning requirement, a large amount of air needs to be blown, the relative energy consumption is large, and the huge flue gas volume can also increase the burden of a series of process flows such as flue gas dust removal, desulfurization, denitration and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a cement burning system based on pure oxygen combustion, which comprises,
a pure oxygen preparation device for producing high concentration oxygen;
the oxygen conveying pipe is connected with the pure oxygen preparation device;
the rotary kiln is connected with the oxygen conveying pipe, and the oxygen conveying pipe is used for conveying high-temperature pure oxygen into the rotary kiln; the end part of the rotary kiln is connected with a kiln head burner, the kiln head burner is connected with the oxygen conveying pipe, and the oxygen conveying pipe is used for conveying high-temperature pure oxygen into the kiln head burner;
the tertiary air pipe is communicated with the oxygen conveying pipe;
the decomposing furnace is connected with the tertiary air pipe, and the tertiary air pipe is used for conveying high-temperature pure oxygen into the decomposing furnace to supply fuel for combustion; the decomposing furnace is also connected with the rotary kiln, and the rotary kiln is used for calcining the hot raw meal discharged from the decomposing furnace;
the kiln tail preheater is connected with the decomposing furnace and is used for preheating raw materials;
the high-temperature fan is connected with the kiln tail preheater through a pipeline and used for carrying out traction conveying on flue gas generated after combustion;
the tail gas treatment device is connected with the high-temperature fan and is used for carrying out dust removal, desulfurization and denitration treatment on the conveyed flue gas;
a CO2 capturing device, wherein the CO2 capturing device is connected with the tail gas processing device, and the CO2 capturing device is used for capturing CO2 of the processed flue gas;
the cooler is connected with the rotary kiln and is used for cooling clinker output by the rotary kiln;
a blower provided at a side of the cooler, the blower for providing sufficient cooling wind into the cooler;
one end of the cooler hot air pipe is connected with the cooler, and the cooler hot air pipe is used for conveying hot air generated by the front half section of the cooler;
one end of the cooler exhaust pipe is connected with the cooler, and the cooler exhaust pipe is used for conveying hot air generated by the rear half section of the cooler; the cooler hot air pipe and the cooler residual air pipe are arranged at the top of the cooler;
the waste heat recovery device is connected with the tail ends of the hot air pipe of the cooler and the waste air pipe of the cooler and is used for recovering waste heat of the conveyed hot air;
the heat exchanger is connected with the oxygen conveying pipe and the hot air pipe of the cooling machine and used for carrying out heat exchange on pure oxygen and high-temperature waste heat air and preheating the pure oxygen into the high-temperature pure oxygen.
Further, the pure oxygen preparation device adopts a low-temperature air separation or pressure swing adsorption mode to produce high-concentration oxygen-containing gas, wherein the oxygen content in the oxygen-containing gas is 95% or more.
Further, the kiln tail preheater comprises a multi-stage arrangement cyclone cylinder, and the stage number of the multi-stage arrangement cyclone cylinder comprises four stages, five stages or six stages.
Furthermore, the rotary kiln is connected with the cooling machine through a feeding necking, and the feeding necking is funnel-shaped.
Further, the temperature of air in the hot air pipe of the cooler is 950-1000 ℃, and the air volume is 0.6-0.7 Nm 3/kg.cl; the air volume of the high-temperature pure oxygen is 0.2-0.25 Nm3/kg. cl, and the temperature is 760-800 ℃ after the heat exchange with the hot air is completed.
Furthermore, air quantity control valves are arranged at the joint of the oxygen conveying pipe and the tertiary air pipe, the joint of the oxygen conveying pipe and the kiln head burner and the joint of the oxygen conveying pipe and the rotary kiln.
Furthermore, the pouring material in the decomposing furnace is made of a high-temperature refractory material which can resist more than 1500 ℃.
The utility model discloses a mode of heat exchange heats the pure oxygen of participating in the burning, improves combustion efficiency, simultaneously the utility model discloses the high temperature pure oxygen that will produce divides three routes to enter into combustion system, promotes combustion temperature, reduces the flue gas volume to reduce cement and burn the heat consumption.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a schematic diagram of a cement firing system according to an embodiment of the present invention;
fig. 2 shows a schematic structural view of a cooling machine according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a kiln head burner according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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 work belong to the protection scope of the present invention.
The utility model provides a cement burning system based on pure oxygen combustion, which comprises, as an example, as shown in figure 1,
a pure oxygen preparation device 1, wherein the pure oxygen preparation device 1 adopts a low-temperature air separation or pressure swing adsorption mode to produce oxygen-containing gas, and the oxygen content in the oxygen-containing gas is 95% or more; the output end of the pure oxygen preparation device 1 is connected with an oxygen conveying pipe 3, and the oxygen conveying pipe 3 is used for conveying the pure oxygen prepared by the pure oxygen preparation device 1; the output end of the oxygen conveying pipe 3 is connected with the tertiary air pipe 12, the tertiary air pipe 12 is connected with the decomposing furnace 10, and the tertiary air pipe 12 conveys the produced pure oxygen into the decomposing furnace 10 for fuel combustion in the decomposing furnace 10 to provide heat for decomposition of raw materials; the decomposing furnace 10 is connected with the rotary kiln 9, and the rotary kiln 9 is used for calcining the thermal raw meal decomposed by the decomposing furnace 10; the rotary kiln 9 is connected with the oxygen conveying pipe 3, a kiln door cover 92 is arranged on the discharging side of the rotary kiln 9, the oxygen conveying pipe 3 is connected with the rotary kiln 9 through the kiln door cover 92, and the conveying pipe 3 conveys pure oxygen into the rotary kiln 9. A kiln head burner 91 is arranged at the discharge port of the rotary kiln 9, and the kiln head burner 91 is connected with the oxygen conveying pipe 3 and supplies oxygen required for forming the flame shape to the kiln head burner 91; the top end of the decomposing furnace 10 is connected with a kiln tail preheater 11, illustratively, the kiln tail preheater 11 adopts a multi-stage series cyclone preheater, and the kiln tail preheater 11 comprises four-stage or five-stage or six-stage cyclone cylinders which are arranged in series; compared with the preheater adopted by the conventional cement production line, the kiln tail preheater 11 configured by pure oxygen combustion of the utility model has the used specification reduced by 40 percent, because the total smoke volume produced is greatly reduced after the oxygen-enriched combustion is adopted; meanwhile, the specification of the kiln tail preheater 11 is reduced, more smoke heat can be recovered, and the firing heat consumption of the system is reduced.
The kiln tail preheater 11 realizes preheating of raw materials required for cement production, and heat used for preheating the kiln tail preheater 11 is from high-temperature flue gas generated by combustion of the decomposing furnace 10 and the rotary kiln 9The kiln tail preheater 11 is connected with a high-temperature fan 14, the high-temperature fan 14 is used for dragging and conveying the heat-exchanged flue gas, the high-temperature fan 14 is connected with a tail gas treatment device 13 through a pipeline, the tail gas treatment device 13 is used for realizing the process treatments of dedusting, desulfurization, denitration and the like on the flue gas, and the tail gas treatment device 13 and the CO are arranged2The trap 15 is connected to pass CO2The trapping device 15 realizes the trapping of CO in the treated flue gas2(ii) a For example, the tail gas treatment device 13 treats the flue gas finally discharged from the firing system through processes of dust removal, desulfurization, denitration and the like, so that the treated CO2The concentration is more than 80 percent to form high-purity flue gas, and then the high-purity flue gas is directly subjected to adsorption rectification to obtain CO with higher purity2Gas (concentration over 99%) and high-purity CO2The gas can be provided for other industrial fields.
The output end of the rotary kiln 9 is connected with a cooler 8, the cooler 8 is used for cooling clinker output by the rotary kiln 9, and two sides of the cooler 8 are provided with blowers 7; the top end of the cooler 8 is connected with a cooler hot air pipe 4 and a cooler residual air pipe 5, and the cooler hot air pipe 4 and the cooler residual air pipe 5 are used for conveying hot air exhausted by the cooler 8; meanwhile, the hot air pipe 4 of the cooler indirectly exchanges heat with the oxygen conveying pipe 3 through the heat exchanger 2, the heat exchange between the high-temperature air and the pure oxygen generated by the pure oxygen preparation device 1 is realized through the heat exchanger 2, the pure oxygen is heated to form high-temperature pure oxygen, and the combustion efficiency can be improved; in order to realize the recovery of the waste heat of the cooler 8 and the reasonable utilization of resources, the cooler hot air pipe 4 connected with the cooler 8 and the cooler waste air pipe 5 are connected with the waste heat recovery device 6, and the waste heat recovery device 6 is used for recovering the waste heat of the high-temperature air generated by the cooler 8.
The utility model exchanges heat between the generated pure oxygen and the high temperature air of the cooler 8 through the heat exchanger 2, realizes the utilization of high temperature waste heat, and simultaneously improves the combustion temperature and efficiency; the high-temperature air is high-temperature hot air discharged after the clinker is cooled at the front half section of the cooler 8, the temperature of the high-temperature hot air is 950-1000 ℃, and the air volume is 0.6-0.7 Nm3/kg.cl(Nm3Means at 0 degree centigrade1 gas volume under standard atmospheric pressure, kg.cl represents kilogram clinker), about 1/3 of the total cooling air volume of the cooling machine 8, and the total oxygen air volume produced by the pure oxygen preparation device 1 is 0.2-0.25 Nm3Cl, the temperature of oxygen after heat exchange can reach 760-800 ℃; the oxygen after heat exchange is divided into three paths to enter a burning system, one path replaces secondary air, and directly enters the rotary kiln 9 through the kiln door cover 92, so that fuel burning in the rotary kiln 9 is met. One path of the air replaces tertiary air to enter the decomposing furnace 10, and combustion supporting is provided for combustion in the decomposing furnace 10. And the other path enters a kiln head burner 91 to be used as primary air to provide impulse for flame formed by combustion in the rotary kiln 9. Flue gas generated by combustion of the rotary kiln 9 enters the decomposing furnace 10 and is in contact with CO generated in the decomposing furnace 102The mixed raw materials enter a kiln tail preheater 11 to preheat the raw materials entering a decomposing furnace 10; the flue gas finally discharged from the firing system enters CO through a flue gas treatment device 132A capture system 15 in CO2The CO is obtained after the processes of dust removal, desulfurization, denitration and the like are carried out again in the trapping system 152The high-purity flue gas with the concentration of more than 80 percent can be directly subjected to adsorption rectification to obtain CO with higher purity (more than 99 percent)2Gas, higher purity (over 99%) CO2The gas can be provided for other industrial fields.
FIG. 2 shows a schematic construction of a cooling machine; as shown in fig. 2, one or more cooling blower chambers 81 are provided at the bottom end of the cooling blower 8, and blowers 7 are provided at both sides of the cooling blower chamber 81, and the blowers 7 are used for providing sufficient cooling air for the cooling blower 8; meanwhile, the cooler 8 is connected with the rotary kiln 9 through a blanking necking 93; the cooling air of the cooler 8 is provided by the blower 7, the oxygen-containing air of the rotary kiln 9 is provided by the pure oxygen preparation device 1, the air of the pure oxygen preparation device and the air of the pure oxygen preparation device are separated and do not interfere with each other, clinker discharged from the kiln falls into the cooler 8 through a discharging reducing port 93 for cooling, the discharging reducing port 93 can ensure that the clinker enters the cooler 8 from the rotary kiln 9, and the air blown into the cooler 8 cannot enter the rotary kiln 9. The cooling air blown into the cooler 8 is divided into two pipelines (the hot air pipe 4 of the cooler and the residual air pipe 5 of the cooler) after heat exchange with the clinker, but is not limited to two pipelines leaving the cooler 8. Wherein the cooling air of the hot air pipe 4 of the high temperature section cooler enters the heat exchanger 2 to exchange heat with the pure oxygen. And cooling air of the cooler residual air pipe 5 at the low temperature section and cooling air at the high temperature section after heat exchange are converged and enter the residual heat recovery device 6.
Fig. 3 shows a schematic structural view of the kiln head burner, and as shown in fig. 3, in order to satisfy pure oxygen combustion in the rotary kiln 9, a suitable kiln head burner 91 needs to be separately designed. The burner is used for combustion by pure oxygen, so that the combustion speed of fuel is greatly accelerated, and on the other hand, because the total combustion-supporting gas quantity is greatly reduced and the wind speed in the rotary kiln 9 is greatly reduced, the impulse of the burner is required to be utilized to form flame with enough length, thereby avoiding ultra-high-temperature ultrashort flame formed by too fast combustion of fuel; the utility model discloses a kiln head combustor 91's structure as follows:
the kiln head burner 91 comprises a cooling air duct 911, an axial flow air duct 912, a coal feeding air duct 913 and a rotational flow air duct 914 from outside to inside. When in use, the large primary air quantity (the primary air is pure oxygen in the oxygen conveying pipeline 3) is adopted, and the sufficient flame length and strength are formed by utilizing the primary air impulse of the kiln head burner 91. The outer shape of the kiln head burner 91 is a circular ring structure, and the air ducts are nested layer by layer from outside to inside. The cooling air channel 911 is arranged on the outermost side, and the cooling air wraps the whole flame, so that the contact between pure oxygen and fuel is slowed down, and the ignition of the fuel is controlled. The axial flow duct 912 is of a porous structure and controls the speed of pure oxygen entering the combustion core region, thereby controlling the combustion speed of the fuel, forming flame with sufficient length, and a low pressure roots blower is used for air supply, wherein the low pressure roots blower is the main source of flame length and impulse. The fuel inlet coal feed air duct 913 is of the same design as the coal feed air duct of a conventional burner head. The swirl air duct 914 is arranged at a small angle of 20-30 degrees, so that a certain effect is achieved on scattering of fuel, and the burnout rate of the fuel can be improved. In addition, in order to improve the combustion efficiency, the characteristic parameters of the kiln head burner 91 are set as follows:
primary air volume: about 0.05 to 0.08Nm3/kg.cl；
The air volume proportion of the cooling air, the axial flow air and the rotational flow air is as follows: 1:2: 1;
cooling wind speed: 50-100 m/s;
axial flow wind speed: 150-200 m/s;
rotating wind speed: 100 to 150 m/s.
The utility model discloses a mode of heat exchange heats the pure oxygen of participating in the burning, improves combustion efficiency, simultaneously the utility model discloses the high temperature pure oxygen that will produce divides three routes to enter into combustion system, promotes combustion temperature, reduces the flue gas volume to reduce cement and burn the heat consumption.
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 technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A cement burning system based on pure oxygen combustion is characterized by comprising a cement burning system,
a pure oxygen preparation device for producing high concentration oxygen;
the oxygen conveying pipe is connected with the pure oxygen preparation device;
the rotary kiln is connected with the oxygen conveying pipe, and the oxygen conveying pipe is used for conveying high-temperature pure oxygen into the rotary kiln; the end part of the rotary kiln is connected with a kiln head burner, the kiln head burner is connected with the oxygen conveying pipe, and the oxygen conveying pipe is used for conveying high-temperature pure oxygen into the kiln head burner;
the tertiary air pipe is communicated with the oxygen conveying pipe;
the decomposing furnace is connected with the tertiary air pipe, and the tertiary air pipe is used for conveying high-temperature pure oxygen into the decomposing furnace to supply fuel for combustion; the decomposing furnace is also connected with the rotary kiln, and the rotary kiln is used for calcining the hot raw meal discharged from the decomposing furnace;
the kiln tail preheater is connected with the decomposing furnace and is used for preheating raw materials;
the high-temperature fan is connected with the kiln tail preheater through a pipeline and used for carrying out traction conveying on flue gas generated after combustion;
the tail gas treatment device is connected with the high-temperature fan and is used for carrying out dust removal, desulfurization and denitration treatment on the conveyed flue gas;
a CO2 capturing device, wherein the CO2 capturing device is connected with the tail gas processing device, and the CO2 capturing device is used for capturing CO2 of the processed flue gas;
the cooler is connected with the rotary kiln and is used for cooling clinker output by the rotary kiln;
a blower provided at a side of the cooler, the blower for providing sufficient cooling wind into the cooler;
one end of the cooler hot air pipe is connected with the cooler, and the cooler hot air pipe is used for conveying hot air generated by the front half section of the cooler;
one end of the cooler exhaust pipe is connected with the cooler, and the cooler exhaust pipe is used for conveying hot air generated by the rear half section of the cooler; the cooler hot air pipe and the cooler residual air pipe are arranged at the top of the cooler;
the waste heat recovery device is connected with the tail ends of the hot air pipe of the cooler and the waste air pipe of the cooler and is used for recovering waste heat of the conveyed hot air;
the heat exchanger is connected with the oxygen conveying pipe and the hot air pipe of the cooling machine and used for carrying out heat exchange on pure oxygen and high-temperature waste heat air and preheating the pure oxygen into the high-temperature pure oxygen.
2. The pure oxygen combustion-based cement burning system according to claim 1, wherein said pure oxygen producing means produces a high concentration oxygen-containing gas by means of low temperature air separation or pressure swing adsorption, wherein the oxygen content in said oxygen-containing gas is 95% or more.
3. The pure oxygen combustion based cement firing system as claimed in claim 1 or 2, wherein the kiln tail preheater comprises a multi-stage arrangement of cyclones having a number of stages comprising four stages, five stages or six stages.
4. The pure oxygen combustion-based cement burning system according to claim 1 or 2, wherein the rotary kiln is connected with the cooling machine through a feed throat, and the feed throat is funnel-shaped.
5. The pure oxygen combustion-based cement burning system according to claim 1 or 2, wherein the temperature of air in the hot blast pipe of the cooler is 950 to 1000 ℃, and the air volume is 0.6 to 0.7Nm 3/kg.cl; the air volume of the high-temperature pure oxygen is 0.2-0.25 Nm3/kg. cl, and the temperature is 760-800 ℃ after the heat exchange with the hot air is completed.
6. The pure oxygen combustion-based cement burning system as claimed in claim 1 or 2, wherein air volume control valves are installed at the connection of the oxygen delivery pipe and the tertiary air pipe, the connection of the oxygen delivery pipe and the kiln head burner, and the connection of the oxygen delivery pipe and the rotary kiln.
7. The pure oxygen combustion-based cement burning system according to claim 1 or 2, wherein the casting material in the decomposing furnace is a high temperature refractory material resistant to 1500 ℃.
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| CN201921298022.5U CN210862210U (en) | 2019-08-12 | 2019-08-12 | Cement system of firing based on pure oxygen burning |
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| CN201921298022.5U CN210862210U (en) | 2019-08-12 | 2019-08-12 | Cement system of firing based on pure oxygen burning |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284147A (en) * | 2020-10-29 | 2021-01-29 | 重庆迅华环境技术有限公司 | High-temperature preheating type oxygen-enriched combustion energy-saving emission-reducing system of sand regenerating furnace for casting |
| CN112393597A (en) * | 2019-08-12 | 2021-02-23 | 天津水泥工业设计研究院有限公司 | Cement firing system and method based on pure oxygen combustion |
| CN113735470A (en) * | 2021-09-16 | 2021-12-03 | 北京中投润天环保科技有限公司 | Cement kiln raw material preheating system |
| CN116332537A (en) * | 2023-03-23 | 2023-06-27 | 乌海市恒业煤化有限公司 | Production system for mixing and calcining cement clinker by using ammonia fuel instead of coal |
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2019
- 2019-08-12 CN CN201921298022.5U patent/CN210862210U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393597A (en) * | 2019-08-12 | 2021-02-23 | 天津水泥工业设计研究院有限公司 | Cement firing system and method based on pure oxygen combustion |
| CN112284147A (en) * | 2020-10-29 | 2021-01-29 | 重庆迅华环境技术有限公司 | High-temperature preheating type oxygen-enriched combustion energy-saving emission-reducing system of sand regenerating furnace for casting |
| CN113735470A (en) * | 2021-09-16 | 2021-12-03 | 北京中投润天环保科技有限公司 | Cement kiln raw material preheating system |
| CN113735470B (en) * | 2021-09-16 | 2022-04-12 | 北京中投润天环保科技有限公司 | Cement kiln raw material preheating system |
| CN116332537A (en) * | 2023-03-23 | 2023-06-27 | 乌海市恒业煤化有限公司 | Production system for mixing and calcining cement clinker by using ammonia fuel instead of coal |
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