CN111189328A - Kiln tail low-ammonia combustion equipment and implementation method thereof - Google Patents
Kiln tail low-ammonia combustion equipment and implementation method thereof Download PDFInfo
- Publication number
- CN111189328A CN111189328A CN201811355669.7A CN201811355669A CN111189328A CN 111189328 A CN111189328 A CN 111189328A CN 201811355669 A CN201811355669 A CN 201811355669A CN 111189328 A CN111189328 A CN 111189328A
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- pipe
- kiln
- coal
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- kiln tail
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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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
Abstract
The invention discloses kiln tail low-ammonia combustion equipment which comprises a kiln, wherein a smoke exhaust pipe is fixed at the top of the kiln, a kiln body is fixed above the inside of the kiln, a kiln tail is arranged below the kiln body, the kiln tail is fixedly connected with the kiln, a base is fixed at the bottom of the kiln, a coal feeding main pipe is fixed on the outer side wall of the base, a feeding pipe is arranged on the outer side wall of the kiln, and the feeding pipe penetrates through one end of the kiln and is fixedly connected with the kiln body; the invention also discloses a method for realizing the kiln tail low-ammonia combustion equipment, the kiln tail low-ammonia combustion equipment is formed by combining the coal injection pipe, the gate valve and the tee joint, the investment is small, the reconstruction is fast, the effect is good, the operation is stable and reliable, the combustor is changed from the original high-oxygen area combustion into the low-oxygen area combustion, the coal is decomposed into carbon monoxide and the like, the carbon monoxide and the like are used as reducing agents to generate reduction reaction with nitrogen oxides in the kiln, and the ammonia water consumption is saved by 30 to 50 percent on the original basis after the use.
Description
Technical Field
The invention belongs to the technical field of kiln equipment, and particularly relates to kiln tail low-ammonia combustion equipment and an implementation method thereof.
Background
NOx mainly discharged by the kiln is discharged into air and is easily oxidized to form NO2 with stable properties, so that the content of nitrogen oxide in the atmosphere is increased, the NOx not only directly causes primary pollution to the atmosphere, but also harms the respiratory system of animals and destroys the stratospheric ozone layer of the atmosphere, is an important substance formed by photochemical smog and acid rain, is also one of main greenhouse gases, and has great harm to the natural environment.
The original reduction of kiln tail nitrogen oxide adopts aqueous ammonia as reductant, and aqueous ammonia quantity is too high thereupon when nitrogen oxide content is too high in the kiln, directly causes the problem that manufacturing cost rises, lacks the equipment and the method that can solve the ammonia volume that the SOx/NOx control process caused big, manufacturing cost is high.
Disclosure of Invention
The invention aims to provide kiln tail low-ammonia combustion equipment to solve the problems in the background technology. The kiln tail low-ammonia combustion equipment provided by the invention has the characteristic of saving the using amount of ammonia water.
The invention also aims to provide a method for realizing the kiln tail low-ammonia combustion equipment.
In order to achieve the purpose, the invention provides the following technical scheme: a kiln tail low ammonia combustion device comprises a kiln, wherein a smoke exhaust pipe is fixed at the top of the kiln, a kiln body is fixed above the inside of the kiln, a kiln tail is arranged below the kiln body, the kiln tail is fixedly connected with the kiln, a base is fixed at the bottom of the kiln, a coal feeding main pipe is fixed on the outer side wall of the base, an inlet pipe is arranged on the outer side wall of the kiln, one end of the inlet pipe penetrating through the kiln is fixedly connected with the kiln body, a main pipe gate valve is fixed at one end of the coal feeding main pipe close to the base, a main pipe tee is fixed at the output end of the main pipe gate valve, two coal feeding branch pipes are fixed at the output end of the main pipe tee, a branch pipe tee is fixed at one end of the coal feeding branch pipe far away from the main pipe tee, a coal injection pipe is arranged on the branch pipe tee, a branch pipe gate valve is arranged on the coal injection pipe, and the, and a burner is arranged on the outer side wall of the kiln tail, and the burner and the branch pipe tee joint are fixedly connected through the coal injection pipe.
In the invention, the two coal feeding branch pipes are correspondingly arranged on the two transmission pipes outside the connection part of the main pipe tee joint and the main pipe gate valve.
In the invention, the two coal feeding branch pipes communicated with the two conveying pipes on the main pipe tee joint are mounted in the same structure.
Furthermore, four coal injection pipes are communicated with the two coal feeding branch pipes through two branch pipe tee joints, and four branch pipe gate valves with the same specification are arranged on the four coal injection pipes.
Further, a burner support is arranged at the bottom of the burner connected with the coal injection pipe, and the kiln tail and the burner are fixedly connected through the burner support.
In the invention, an air duct pipe is fixed inside the combustor, one end of the air duct pipe is fixed with the coal injection pipe, and the other end of the air duct pipe is fixed with a combustion chamber.
In the invention, a flame nozzle is arranged at one end of the combustion chamber far away from the air duct pipe.
In the invention, the coal feeding main pipe and the bottom of the feeding pipe are correspondingly provided with a support which is a steel pipe member.
Further, the method for realizing the kiln tail low-ammonia combustion equipment comprises the following steps:
the method comprises the following steps: installing the burner within the kiln tail of the kiln through the burner mount; changing the burner from high-oxygen combustion to low-oxygen combustion
Step two: the coal is transmitted to the coal injection pipe through the coal feeding branch pipe connected with the coal feeding main pipe, the coal injection pipe controls the opening and closing of the coal feeding branch pipe through the main pipe gate valve in the transmission process, materials conducted by the coal feeding branch pipe connected with the main pipe tee joint are separated through the branch pipe tee joint, and the conduction of coal to the burner in the coal injection pipe is controlled through the branch pipe gate valve;
step three: the combustor is used for mixing coal materials in the coal injection pipe through the air duct pipe inside, the coal materials are combusted in the combustion chamber and are combusted to enable coal to decompose carbon monoxide and the like, substances such as carbon monoxide and the like are used as reducing agents to generate reduction reaction with nitrogen oxides in the kiln, the problem that the ammonia water consumption is large due to reduction of the nitrogen oxides is solved, and the ammonia water consumption is saved by 30% -50% on the original basis.
In the method for realizing the kiln tail low-ammonia combustion equipment, two coal conveying branch pipes are correspondingly arranged on two conveying pipes outside the connection part of the main pipe tee joint and the main pipe gate valve; the two coal feeding branch pipes communicated with the two transmission pipes on the main pipe tee joint are mounted in the same structure; four coal injection pipes are communicated with the two coal conveying branch pipes through two branch pipe tee joints, and four branch pipe gate valves with the same specification are arranged on the four coal injection pipes; a burner support is arranged at the bottom of the burner connected with the coal injection pipe, and the kiln tail is fixedly connected with the burner through the burner support; an air duct pipe is fixed inside the combustor, one end of the air duct pipe is fixed with the coal injection pipe, and the other end of the air duct pipe is fixed with a combustion chamber; one end of the combustion chamber, which is far away from the air duct pipe, is provided with a flame nozzle; the coal feeding main pipe and the bottom of the feeding pipe are correspondingly provided with a support, and the support is a steel pipe member.
Compared with the prior art, the invention has the beneficial effects that:
1. the kiln tail low-ammonia combustion equipment is formed by combining the coal injection pipe, the gate valve and the tee joint, and has the advantages of small investment, quick modification, good effect and stable and reliable operation;
2. the burner is changed from the original high-oxygen combustion into the low-oxygen combustion, so that coal is decomposed into carbon monoxide and the like, and the carbon monoxide and the like are used as reducing agents to generate reduction reaction with nitrogen oxides in the kiln, and the using amount of ammonia water is saved by 30 to 50 percent on the original basis after the burner is used;
3. the coal injection pipe connected with the kiln tail burner is improved from two to four, and a main pipe tee joint, a main pipe gate valve, a branch pipe tee joint and a branch pipe gate valve are arranged on a coal feeding main pipe and a coal feeding branch pipe which are connected with the coal injection pipe, so that the use adjustment and switching of different coal injection pipes can be carried out;
4. the burner is overheated after being used for a long time, the burner on the coal feeding branch pipe is switched to be used for replacing combustion, the burner used for a long time is cooled, the switching equipment keeps the burner to stably burn, and the service life of different coal injection pipe connecting burners is prolonged;
5. the coal injection pipes connected with the different coal feeding branch pipes through the branch pipe tee joints are controlled to be opened and closed through the branch pipe gate valves, so that the coal material required by the combustion of the combustor can be conveniently conveyed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a coal conveying pipeline according to the present invention;
FIG. 3 is a schematic view of the burner configuration of the present invention;
in the figure: 1. a kiln; 2. a kiln body; 3. a kiln tail; 4. a base; 5. a burner; 6. a smoke exhaust pipe; 7. a coal delivery main pipe; 8. a feed pipe; 9. a main pipe gate valve; 10. a main pipe tee joint; 11. a coal feeding branch pipe; 12. a branch pipe tee joint; 13. branch pipe gate valves; 14. a coal injection pipe; 15. an air duct pipe; 16. a combustion chamber; 17. a burner mount.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1-3, the present invention provides the following technical solutions: a kiln tail low ammonia combustion device comprises a kiln 1, a smoke exhaust pipe 6 is welded at the top of the kiln 1, a kiln body 2 is welded at the upper part inside the kiln 1, a kiln tail 3 is arranged below the kiln body 2, the kiln tail 3 is welded with the kiln 1, a base 4 is screwed at the bottom of the kiln 1, a coal feeding main pipe 7 is connected to the outer side wall of the base 4 through a flange, a feeding pipe 8 is arranged on the outer side wall of the kiln 1, one end of the feeding pipe 8 penetrating through the kiln 1 is connected with the kiln body 2 through a flange, a main pipe gate valve 9 is fixed at one end of the coal feeding main pipe 7 close to the base 4, a main pipe tee 10 is fixed at the output end of the main pipe gate valve 9, two coal feeding branch pipes 11 are fixed at the output end of the main pipe tee 10, a branch pipe tee 12 is fixed at one end of the coal feeding branch pipe 11 far away from the main pipe tee 10, a coal injection pipe 14 is, the outer side wall of the kiln tail 3 is provided with a burner 5, the burner 5 is fixedly connected with a branch pipe tee joint 12 through a coal injection pipe 14, a coal feeding main pipe 7, a main pipe gate valve 9, a main pipe tee joint 10, a coal feeding branch pipe 11, a branch pipe tee joint 12, a branch pipe gate valve 13 and the coal injection pipe 14 are fixedly connected through flange plates in sequence, and a sealing ring is bonded at the joint for sealing.
In this embodiment, the main pipe gate valve 9 and the branch pipe gate valve 13 are both gate valves of type Z41 sold by shanghai le hui pump valve manufacturing ltd; the burner 15 is a model LT-rsq burner sold by Zibonong Tai kiln science and technology Limited.
Further, two coal feeding branch pipes 11 correspond to two conveying pipes which are arranged outside the connection part of the main pipe tee joint 10 and the main pipe gate valve 9.
Furthermore, the two coal feeding branch pipes 11 communicated with the two conveying pipes on the main pipe tee joint 10 are installed in the same structure.
In this embodiment, the transmission pipe is used for transmitting coal materials, and the transmission pipe is inserted between the main pipe tee joint 10 and the coal conveying branch pipe 11.
Furthermore, four coal injection pipes 14 are communicated with the two coal feeding branch pipes 11 through two branch pipe tee joints 12, and four branch pipe gate valves 13 with the same specification are arranged on the four coal injection pipes 14.
In this embodiment, the hand wheel on the top of the branch pipe gate valve 13 is screwed to control the coal injection pipe 14 to be opened, when the combustion time of the burner 5 connected with two coal injection pipes 14 is too long, the hand wheel on the top of the branch pipe gate valve 13 is screwed reversely to control the coal injection pipe 14 to be closed, the burner 5 in combustion is extinguished, the branch pipe gate valves 13 on the other two coal injection pipes 14 are simultaneously rotated to control the other burner 5 to be opened, the combustion of coal materials is continued, and carbon monoxide is generated to assist the reduction reaction of nitrogen oxide in the kiln 1.
Further, a burner support 17 is arranged at the bottom of the burner 5 connected with the coal injection pipe 14, and the kiln tail 3 and the burner 5 are fixedly connected through the burner support 17.
Further, an air duct pipe 15 is fixed inside the combustor 5, a coal injection pipe 14 is fixed to one end of the air duct pipe 15, and a combustion chamber 16 is fixed to the other end.
Further, a burner is provided at an end of the combustion chamber 16 remote from the air duct 15.
In this embodiment, the burner structure is the toper, welds the output in combustion chamber 16, sprays the flame of burning in combustion chamber 16 to the hypoxemia area in kiln tail 3.
Furthermore, the coal feeding main pipe 7 and the feeding pipe 8 are correspondingly provided with supports at the bottoms, and the supports are steel pipe members.
Further, the method for realizing the kiln tail low-ammonia combustion equipment comprises the following steps:
the method comprises the following steps: the burner 5 is arranged in the kiln tail 3 of the kiln 1 through a burner bracket 17, and the burner 5 is changed from high-oxygen combustion to low-oxygen combustion;
step two: coal is transmitted to a coal injection pipe 14 through a coal feeding branch pipe 11 connected with a coal feeding main pipe 7, the coal injection pipe 14 controls the opening and closing of the coal feeding branch pipe 11 through a main pipe gate valve 9 in the transmission process, materials conducted by the coal feeding branch pipe 11 connected with a main pipe tee joint 10 are separated through a branch pipe tee joint 12, and the conduction of the coal to a combustor 5 in the coal injection pipe 14 is controlled through a branch pipe gate valve 13;
step three: the combustor 5 is mixed with the coal material in the coal injection pipe 14 through the air duct pipe 15 inside, the mixture is combusted in the combustion chamber 16, the coal is decomposed into carbon monoxide and the like through combustion, and substances such as the carbon monoxide and the like are used as reducing agents to generate reduction reaction with nitrogen oxides in the kiln 1, so that the problem that the ammonia water consumption is large due to reduction of the nitrogen oxides is solved, and the ammonia water consumption is saved by 30-50% on the original basis.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a low ammonia combustion apparatus of kiln tail, includes kiln (1), the top of kiln (1) is fixed with smoke exhaust pipe (6), just the inside top of kiln (1) is fixed with the kiln body (2), the below of the kiln body (2) is equipped with kiln tail (3), kiln tail (3) with kiln (1) fixed connection, the bottom of kiln (1) is fixed with base (4), the lateral wall of base (4) is fixed with send coal to be responsible for (7), the lateral wall of kiln (1) is equipped with inlet pipe (8), inlet pipe (8) run through the one end of kiln (1) with the kiln body (2) fixed connection, its characterized in that: coal feeding person in charge (7) are close to the one end of base (4) is fixed with person in charge gate valve (9), the output of person in charge gate valve (9) is fixed with person in charge tee bend (10), the output of being responsible for tee bend (10) is fixed with two coal feeding branch pipes (11), coal feeding branch pipe (11) are kept away from the one end of being responsible for tee bend (10) is fixed with branch pipe tee bend (12), be equipped with coal injection pipe (14) on branch pipe tee bend (12), be equipped with branch pipe gate valve (13) on coal injection pipe (14), branch pipe tee bend (12) with coal injection pipe (14) pass through branch pipe gate valve (13) fixed connection, the lateral wall of kiln tail (3) is equipped with combustor (5), combustor (5) with branch pipe tee bend (12) pass through coal injection pipe (14) fixed connection.
2. The kiln tail low ammonia combustion device as set forth in claim 1, wherein: the two coal conveying branch pipes (11) are correspondingly arranged on two conveying pipes outside the connection part of the main pipe tee joint (10) and the main pipe gate valve (9).
3. The kiln tail low ammonia combustion device as set forth in claim 2, wherein: the two coal feeding branch pipes (11) communicated with the two transmission pipes on the main pipe tee joint (10) are installed in the same structure.
4. The kiln tail low ammonia combustion device as set forth in claim 3, wherein: the two coal conveying branch pipes (11) are communicated with four coal injection pipes (14) through two branch pipe tee joints (12), and four branch pipe gate valves (13) with the same specification are arranged on the four coal injection pipes (14).
5. The kiln tail low ammonia combustion device as set forth in claim 4, wherein: the bottom of the combustor (5) connected with the coal injection pipe (14) is provided with a combustor support (17), and the kiln tail (3) is fixedly connected with the combustor (5) through the combustor support (17).
6. The kiln tail low ammonia combustion device as set forth in claim 5, wherein: an air duct pipe (15) is fixed inside the combustor (5), one end of the air duct pipe (15) is fixed with the coal injection pipe (14), and the other end of the air duct pipe is fixed with a combustion chamber (16).
7. The kiln tail low ammonia combustion device as set forth in claim 6, wherein: and one end of the combustion chamber (16) far away from the air duct pipe (15) is provided with a flame nozzle.
8. The kiln tail low ammonia combustion device as set forth in claim 7, wherein: the coal feeding main pipe (7) and the bottom of the feeding pipe (8) are correspondingly provided with a support, and the support is a steel pipe member.
9. The method for realizing the kiln tail low-ammonia combustion equipment as claimed in any one of claims 1 to 8, is characterized by comprising the following steps:
the method comprises the following steps: installing the burner (5) in the kiln tail (3) of the kiln (1) through the burner support (17), and improving the combustion of the burner (5) from a high-oxygen region to a low-oxygen region;
step two: coal is transmitted to the coal injection pipe (14) through the coal feeding branch pipe (11) connected with the coal feeding main pipe (7), the coal injection pipe (14) is controlled to be opened and closed through the main pipe gate valve (9) in the transmission process, materials conducted by the coal feeding branch pipe (11) connected with the main pipe tee joint (10) are separated through the branch pipe tee joint (12), and the conduction of the coal to the combustor (5) in the coal injection pipe (14) is controlled through the branch pipe gate valve (13);
step three: combustor (5) through inside air duct pipe (15) with the coal charge in coal injection pipe (14) mixes the burning in combustion chamber (16), and the burning makes the coal decompose carbon monoxide etc. through material such as carbon monoxide as reductant with nitrogen oxide in kiln (1) produces the reduction reaction, and it is great to solve the reduction consumption aqueous ammonia quantity of nitrogen oxide, and the aqueous ammonia quantity saves 30% to 50% on former basis.
10. The method for realizing the kiln tail low-ammonia combustion equipment as claimed in claim 9, is characterized in that: the two coal feeding branch pipes (11) are correspondingly arranged on two transmission pipes outside the connection part of the main pipe tee joint (10) and the main pipe gate valve (9); the two coal feeding branch pipes (11) communicated with the two transmission pipes on the main pipe tee joint (10) are installed in the same structure; four coal injection pipes (14) are communicated on the two coal conveying branch pipes (11) through two branch pipe tee joints (12), and four branch pipe gate valves (13) with the same specification are arranged on the four coal injection pipes (14); a burner support (17) is arranged at the bottom of the burner (5) connected with the coal injection pipe (14), and the kiln tail (3) is fixedly connected with the burner (5) through the burner support (17); an air duct pipe (15) is fixed inside the combustor (5), one end of the air duct pipe (15) is fixed with the coal injection pipe (14), and the other end of the air duct pipe is fixed with a combustion chamber (16); one end of the combustion chamber (16) far away from the air duct pipe (15) is provided with a flame nozzle; the coal feeding main pipe (7) and the bottom of the feeding pipe (8) are correspondingly provided with a support, and the support is a steel pipe member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811355669.7A CN111189328A (en) | 2018-11-14 | 2018-11-14 | Kiln tail low-ammonia combustion equipment and implementation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811355669.7A CN111189328A (en) | 2018-11-14 | 2018-11-14 | Kiln tail low-ammonia combustion equipment and implementation method thereof |
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| Publication Number | Publication Date |
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| CN111189328A true CN111189328A (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811355669.7A Pending CN111189328A (en) | 2018-11-14 | 2018-11-14 | Kiln tail low-ammonia combustion equipment and implementation method thereof |
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| CN (1) | CN111189328A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203144299U (en) * | 2012-10-19 | 2013-08-21 | 安徽海螺建材设计研究院 | Novel dry-process cement kiln clinker production line employing denitration technology |
| CN205137439U (en) * | 2015-11-24 | 2016-04-06 | 山东卓昶节能科技有限公司 | Oxygendeficient steam hangs down ammonia combustion system |
| CN106066126A (en) * | 2016-07-27 | 2016-11-02 | 北京凯盛建材工程有限公司 | A kind of overall process low-NO_x combustion technology being applied to cement kiln reduction cement kiln NOx discharge |
-
2018
- 2018-11-14 CN CN201811355669.7A patent/CN111189328A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203144299U (en) * | 2012-10-19 | 2013-08-21 | 安徽海螺建材设计研究院 | Novel dry-process cement kiln clinker production line employing denitration technology |
| CN205137439U (en) * | 2015-11-24 | 2016-04-06 | 山东卓昶节能科技有限公司 | Oxygendeficient steam hangs down ammonia combustion system |
| CN106066126A (en) * | 2016-07-27 | 2016-11-02 | 北京凯盛建材工程有限公司 | A kind of overall process low-NO_x combustion technology being applied to cement kiln reduction cement kiln NOx discharge |
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Application publication date: 20200522 |
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| RJ01 | Rejection of invention patent application after publication |