CN109827169B - Boiler low-temperature flue gas recirculation combustion system and application method thereof - Google Patents
Boiler low-temperature flue gas recirculation combustion system and application method thereof Download PDFInfo
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- CN109827169B CN109827169B CN201910209169.0A CN201910209169A CN109827169B CN 109827169 B CN109827169 B CN 109827169B CN 201910209169 A CN201910209169 A CN 201910209169A CN 109827169 B CN109827169 B CN 109827169B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention provides a boiler low-temperature flue gas recirculation combustion system and an application method thereof, wherein the boiler low-temperature flue gas recirculation combustion system comprises a boiler, a flue gas exhaust pipe of the boiler is connected with an air preheater, a flue gas output end of the air preheater is connected with an electric dust collector, an output air duct of the electric dust collector is connected with a low-temperature flue gas recirculation fan, and an output pipe of a hot secondary air bellows of the air preheater is combined with an output pipe of the low-temperature flue gas recirculation fan through a heat secondary air flow adjusting baffle and then is connected with a central air nozzle of a boiler pulverized coal burner through a nonmetallic expansion joint. The invention can effectively control the ignition point of pulverized coal at the outlet of the pulverized coal burner, and avoid the condition of coking or burning loss of the burner nozzle caused by too close ignition point; a central negative pressure area is formed between the central air and the primary air, so that the problems of large-area coke hanging of a sanitation burning belt and a water cooling wall around the pulverized coal burner are solved; the oxygen content and the wind speed of the central wind are changed, so that the problems of large-area coking and burning loss of the burner of the high-sodium metal coal boiler can be effectively restrained.
Description
Technical Field
The invention relates to the technical field of heat energy engineering research, in particular to a boiler low-temperature flue gas recirculation combustion system and an application method thereof.
Background
At present, the western region in China has ascertained that the high sodium metal coal resources with very abundant reserves are extremely strong in slagging and contamination characteristics, and when the high sodium metal coal is blended or fully burned in a large proportion, the water-cooled wall, the screen, the high-speed area and the high-speed area in the furnace form large-area dust deposit with relatively strong cohesiveness, and meanwhile, the water-cooled wall around the burner nozzle and the inside of the burner are also large-area coke hanging, so that the burner is burnt, and the safe and stable operation of the power station boiler is seriously influenced. On the premise of ensuring the safety of equipment, in order to burn high-sodium metal coal, domestic power plants alleviate the safety risk of the boiler caused by the high-sodium coal by adopting large-proportion blending combustion of coal types which are not easy to coke, adding high-melting-point flux resistance or reducing unit load, but under the running condition of the mode, the utilization ratio of the high-sodium coal is very low, the economic benefit of the power plants is sacrificed, and the development of the coal-electricity industry is seriously influenced.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a boiler low-temperature flue gas recirculation combustion system and an application method thereof.
The invention adopts the following technical scheme to realize the aim:
the low-temperature smoke recirculation combustion system of boiler includes boiler, smoke exhaust pipe of the boiler is connected with air preheater, smoke output end of the air preheater is connected with electric dust collector, the output air channel of the electric dust collector is divided into two paths, one path is conventional smoke output pipe, the other path is low-temperature smoke recirculation eduction pipe, the low-temperature smoke recirculation eduction pipe is connected with low-temperature smoke recirculation fan,
the air output end of the air preheater is connected with a hot secondary air box, the output air channel of the hot secondary air box is divided into two paths, one path is connected with the hot secondary air nozzles of a plurality of pulverized coal burners of the boiler through a hot secondary air pipe, the other path is combined with the output pipe of the warm flue gas recirculation fan through a hot secondary air outlet pipe, the hot secondary air outlet pipe is provided with an outlet hot secondary air volume adjusting baffle, the output pipe of the low-temperature flue gas recirculation fan is combined with the hot secondary air outlet pipe and then is connected with the central air nozzles of the pulverized coal burners through a central air pipe, and a nonmetallic expansion joint is arranged on the central air pipe.
Preferably, the air quantity adjusting baffle for leading out the hot secondary air is driven by a motor.
Preferably, the conventional flue gas output pipe is connected with a chimney through a draught fan.
An application method of a boiler low-temperature flue gas recirculation combustion system comprises the following specific steps:
the central air oxygen content and the central air speed of the pulverized coal burner are adjusted by adjusting the output power of the low-temperature flue gas recirculation fan and the opening of the hot secondary air quantity adjusting baffle, so that the ignition point position of the pulverized coal burner and the rigidity of the air flow of the pulverized coal are adjusted.
Preferably, the specific steps are as follows: the central wind speed of the pulverized coal burner is improved by adjusting the output power of the low-temperature flue gas recirculation fan and the opening of the hot secondary wind quantity adjusting baffle, so that the central wind speed is far higher than the primary wind speed, and a central negative pressure area is formed between the primary wind and the central wind of the pulverized coal burner, so that the premature divergence of the primary wind and the pulverized coal flow and the wall brushing are avoided.
Preferably, the ignition point of the pulverized coal burner is far away from the nozzle of the pulverized coal burner by reducing the proportion of hot secondary air in the central air so as to avoid large-area coke hanging.
The beneficial effects of the invention are as follows: the central air of the burner consists of the low-temperature recirculated flue gas and the hot secondary air, and the pulverized coal ignition point at the outlet of the pulverized coal burner can be effectively controlled by adjusting the ratio of the low-temperature recirculated flue gas amount to the hot secondary air, so that the condition of coking or burning loss of a burner nozzle caused by too close ignition point is avoided. The central wind speed of the pulverized coal burner is improved by adjusting the output of the smoke recirculation fan and the opening of the hot secondary wind quantity adjusting baffle, so that the central wind speed is far higher than the primary wind speed, a central negative pressure area is formed between the central wind and the primary wind, the conditions of premature divergence and wall brushing of primary wind and powder airflow are avoided, the problems of large-area coke hanging of a sanitation burning belt and a water cooling wall around the pulverized coal burner are solved, and the problems of large-area coking and burning loss of the burner of the high-sodium metal coal boiler for burning are effectively inhibited.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: 1-a boiler; 2-an air preheater; 3-an electric dust collector; 4-a conventional flue gas output pipe; 5-a low-temperature flue gas recirculation eduction tube; 6-a low-temperature flue gas recirculation fan; 7, a hot secondary air quantity adjusting baffle is led out; 8-nonmetallic expansion joints; 9-pulverized coal burner;
the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples:
the low-temperature flue gas recirculation combustion system of the boiler comprises a boiler 1, a flue gas exhaust pipe of the boiler 1 is connected with an air preheater 2, a flue gas output end of the air preheater 2 is connected with an electric dust collector 3, an output air channel of the electric dust collector 3 is divided into two paths, one path is a conventional flue gas output pipe 4, the other path is a low-temperature flue gas recirculation eduction pipe 5, the low-temperature flue gas recirculation eduction pipe 5 is connected with a low-temperature flue gas recirculation fan 6,
the air output end of the air preheater 2 is connected with a hot secondary air box, the output air channel of the hot secondary air box is divided into two paths, one path is connected with the hot secondary air nozzles of a plurality of pulverized coal burners 9 of the boiler 1 through a hot secondary air pipe, the other path is combined with the output pipe of the warm flue gas recirculation fan 6 through a hot secondary air eduction pipe, the hot secondary air eduction pipe is provided with a heat secondary air quantity adjusting baffle 7 eduction air quantity adjusting baffle, the output pipe of the low-temperature flue gas recirculation fan 6 is combined with the hot secondary air eduction pipe and then is connected with the central air nozzles of the pulverized coal burners 9 through a central air pipe, and a nonmetallic expansion joint 8 is arranged on the central air pipe.
Preferably, the air quantity adjusting baffle 7 for leading out the hot secondary air is driven by a motor.
Preferably, the conventional flue gas output pipe 4 is connected with a chimney through a draught fan.
An application method of a boiler low-temperature flue gas recirculation combustion system comprises the following specific steps:
the oxygen content and the wind speed of the central wind of the pulverized coal burner 9 are regulated by regulating the output power of the low-temperature flue gas recirculation fan 6 and the opening of the hot secondary wind quantity regulating baffle 7, so that the ignition point position of the pulverized coal burner 9 and the rigidity of the air flow of the pulverized coal are regulated.
Preferably, the specific steps are as follows: the central wind speed of the pulverized coal burner 9 is improved by adjusting the output power of the low-temperature flue gas recirculation fan 6 and the opening of the hot secondary wind quantity adjusting baffle 7, so that the central wind speed is far higher than the primary wind speed, and a central negative pressure area is formed between the primary wind and the central wind of the pulverized coal burner 9 so as to avoid the premature divergence of the primary wind and the powder airflow and the wall brushing.
Preferably, the ignition point of the pulverized coal burner 9 is far away from the nozzle of the pulverized coal burner 9 by reducing the proportion of hot secondary air in the central air so as to avoid large-area coke hanging.
The central air of the burner consists of the low-temperature recirculated flue gas and the hot secondary air, and the ignition point of the pulverized coal at the outlet of the pulverized coal burner 9 can be effectively controlled by adjusting the ratio of the low-temperature recirculated flue gas amount to the hot secondary air, so that the condition of coking or burning loss of a burner nozzle caused by too close ignition point is avoided. The central wind speed of the pulverized coal burner 9 is improved by adjusting the output of the smoke recirculation fan and the opening of the hot secondary wind quantity adjusting baffle 7, so that the central wind speed is far higher than the primary wind speed, a central negative pressure area is formed between the central wind and the primary wind, the conditions of early divergence and wall brushing of the primary wind and powder flow are avoided, the problems of large-area coke hanging of a sanitation burning zone and a water cooling wall around the pulverized coal burner 9 are solved, and the problems of large-area coking and burning loss of the high-sodium metal coal boiler burner for burning can be effectively restrained.
Example 1
The low-temperature flue gas recirculation combustion system of the boiler comprises a boiler 1, a flue gas exhaust pipe of the boiler 1 is connected with an air preheater 2, a flue gas output end of the air preheater 2 is connected with an electric dust collector 3, an output air channel of the electric dust collector 3 is divided into two paths, one path is a conventional flue gas output pipe 4, the other path is a low-temperature flue gas recirculation eduction pipe 5, the low-temperature flue gas recirculation eduction pipe 5 is connected with a low-temperature flue gas recirculation fan 6,
the air output end of the air preheater 2 is connected with a hot secondary air box, the output air channel of the hot secondary air box is divided into two paths, one path is connected with the hot secondary air nozzles of a plurality of pulverized coal burners 9 of the boiler 1 through a hot secondary air pipe, the other path is combined with the output pipe of the warm flue gas recirculation fan 6 through a hot secondary air eduction pipe, the hot secondary air eduction pipe is provided with a heat secondary air quantity adjusting baffle 7 eduction air quantity adjusting baffle, the output pipe of the low-temperature flue gas recirculation fan 6 is combined with the hot secondary air eduction pipe and then is connected with the central air nozzles of the pulverized coal burners 9 through a central air pipe, and a nonmetallic expansion joint 8 is arranged on the central air pipe.
Preferably, the air quantity adjusting baffle 7 for leading out the hot secondary air is driven by a motor.
Preferably, the conventional flue gas output pipe 4 is connected with a chimney through a draught fan.
An application method of a boiler low-temperature flue gas recirculation combustion system comprises the following specific steps:
the oxygen content of the central air and the wind speed of the pulverized coal burner 9 are regulated by regulating the output power of the low-temperature flue gas recirculation fan 6 and the opening of the hot secondary air quantity regulating baffle 7, and the ignition point of the pulverized coal burner 9 is far away from the nozzle of the pulverized coal burner 9 by reducing the proportion of the hot secondary air in the central air, so that the problems of large-area coking and burning loss of the high-sodium metal coal boiler burner are effectively inhibited, and the conditions of coal powder nozzle and internal coking and burning loss caused by the advanced ignition of the pulverized coal burner 9 in a boiler burning high-sodium metal coal are avoided.
Example two
The low-temperature flue gas recirculation combustion system of the boiler comprises a boiler 1, a flue gas exhaust pipe of the boiler 1 is connected with an air preheater 2, a flue gas output end of the air preheater 2 is connected with an electric dust collector 3, an output air channel of the electric dust collector 3 is divided into two paths, one path is a conventional flue gas output pipe 4, the other path is a low-temperature flue gas recirculation eduction pipe 5, the low-temperature flue gas recirculation eduction pipe 5 is connected with a low-temperature flue gas recirculation fan 6,
the air output end of the air preheater 2 is connected with a hot secondary air box, the output air channel of the hot secondary air box is divided into two paths, one path is connected with the hot secondary air nozzles of a plurality of pulverized coal burners 9 of the boiler 1 through a hot secondary air pipe, the other path is combined with the output pipe of the warm flue gas recirculation fan 6 through a hot secondary air eduction pipe, the hot secondary air eduction pipe is provided with a heat secondary air quantity adjusting baffle 7 eduction air quantity adjusting baffle, the output pipe of the low-temperature flue gas recirculation fan 6 is combined with the hot secondary air eduction pipe and then is connected with the central air nozzles of the pulverized coal burners 9 through a central air pipe, and a nonmetallic expansion joint 8 is arranged on the central air pipe.
Preferably, the air quantity adjusting baffle 7 for leading out the hot secondary air is driven by a motor.
Preferably, the conventional flue gas output pipe 4 is connected with a chimney through a draught fan.
An application method of a boiler low-temperature flue gas recirculation combustion system comprises the following specific steps:
the central wind speed of the pulverized coal burner 9 is improved by adjusting the output power of the low-temperature flue gas recirculation fan 6 and the opening of the hot secondary wind quantity adjusting baffle 7, so that the central wind speed is far higher than the primary wind speed, a central negative pressure area is formed between the primary wind and the central wind of the pulverized coal burner 9, the problems of premature divergence and wall brushing of the primary wind and the pulverized coal airflow and large-area coke hanging of a sanitation burning belt and a water cooling wall around the burner are solved.
Before the system of the invention is adopted, the boiler burning high sodium coal needs to be decoked manually for more than two times in every eight hours on average; after the system of the invention is adopted, manual decoking is not needed, the overhaul time of a unit is saved, and the production efficiency is improved.
While the invention has been described above with reference to specific embodiments, it will be apparent that the invention is not limited to the above embodiments, but is intended to cover various modifications of the method concepts and technical solutions of the invention, or applications without modifications, in other applications.
Claims (2)
1. An application method of a boiler low-temperature flue gas recirculation combustion system is characterized in that,
the low-temperature flue gas recirculation combustion system of the boiler comprises a boiler (1), a flue gas exhaust pipe of the boiler (1) is connected with an air preheater (2), a flue gas output end of the air preheater (2) is connected with an electric dust collector (3), an output air channel of the electric dust collector (3) is divided into two paths, one path is a conventional flue gas output pipe (4), the other path is a low-temperature flue gas recirculation eduction pipe (5), the low-temperature flue gas recirculation eduction pipe (5) is connected with a low-temperature flue gas recirculation fan (6), an air output end of the air preheater (2) is connected with a hot secondary air bellows, an output air channel of the hot secondary air bellows is divided into two paths, one path is connected with hot secondary air nozzles of a plurality of pulverized coal burners (9) of the boiler (1) through the hot secondary air pipes, the other path is combined with an output pipe of the hot secondary air recirculation fan (6) through the hot secondary air eduction pipe, an output pipe of the low-temperature flue gas recirculation fan (6) is combined with the hot secondary air eduction pipe and then is connected with a central air nozzle of the pulverized coal burner (9) through a central air pipe, and a non-expansion motor is arranged on the central air outlet pipe (7) is connected with the conventional flue gas outlet pipe (4);
the specific steps in application are as follows: the output power of the low-temperature flue gas recirculation fan (6) and the opening of the hot secondary air quantity adjusting baffle (7) are adjusted to improve the oxygen content of the central air and the wind speed of the central air of the pulverized coal burner (9), so that the wind speed of the central air is far higher than that of the primary air, and a central negative pressure area is formed between the primary air and the central air of the pulverized coal burner (9) to prevent the primary air and the pulverized coal from being scattered prematurely and brushing the wall, thereby adjusting the ignition point position of the pulverized coal burner (9) and the rigidity of the pulverized coal.
2. The method for using a boiler low temperature flue gas recirculation combustion system according to claim 1, characterized by the specific steps of: the ignition point of the pulverized coal burner (9) is far away from the nozzle of the pulverized coal burner (9) by reducing the proportion of hot secondary air in the central air, so that large-area coke hanging is avoided.
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| CN112413562A (en) * | 2020-10-28 | 2021-02-26 | 重庆富燃科技股份有限公司 | Device and method for protecting water-cooled wall of boiler by introducing flue gas at tail of boiler |
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