CN209876904U - Boiler low-temperature flue gas recirculation combustion system - Google Patents
Boiler low-temperature flue gas recirculation combustion system Download PDFInfo
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- CN209876904U CN209876904U CN201920348306.4U CN201920348306U CN209876904U CN 209876904 U CN209876904 U CN 209876904U CN 201920348306 U CN201920348306 U CN 201920348306U CN 209876904 U CN209876904 U CN 209876904U
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- flue gas
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- gas recirculation
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- temperature flue
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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 utility model provides a boiler low temperature flue gas recirculation combustion system, including the boiler, the pipe of discharging fume of boiler even has air heater, and air heater's flue gas output end even has electrostatic precipitator, and electrostatic precipitator's output wind channel even has low temperature flue gas recirculation fan, and air heater's hot overgrate air bellows's output tube is through drawing forth hot overgrate air flow control baffle and low temperature flue gas recirculation fan's output tube merge the back and link to each other through non-metallic expansion joint and boiler pulverized coal burner's central wind spout. The utility model can effectively control the ignition point of the 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 problem of large-area coke hanging of a guard combustion zone and a water-cooled wall around the pulverized coal burner is 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 boiler burner burning the high-sodium metal coal can be effectively inhibited.
Description
Technical Field
The utility model relates to a heat energy engineering research technical field especially relates to a boiler low temperature flue gas recirculation combustion system.
Background
At present, the western regions in China have found that the high-sodium metal coal resource with rich reserves has extremely strong slagging and contamination characteristics, and when the high-sodium metal coal is burnt in a large proportion or is burnt completely, the water-cooled wall, the screen and the high-sodium metal coal in the boiler can form large-area ash deposit with strong cohesiveness in a high-temperature region, and meanwhile, the water-cooled wall around the nozzle of the burner and the inside of the burner can be hung with large area of coke, so that the burning loss of the burner is caused, 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 adopt a large proportion to mix and burn coal types which are difficult to coke, add a high-melting-point flux or reduce the load of a unit to relieve the safety risk of a boiler caused by the high-sodium coal, but under the operation 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 and electricity industry is seriously influenced.
Disclosure of Invention
The utility model aims at solving the defects of the prior art and providing a boiler low-temperature flue gas recirculation combustion system.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
a boiler low-temperature flue gas recirculation combustion system comprises a boiler, wherein a smoke exhaust pipe of the boiler is connected with an air preheater, the 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 divided into two paths, one path is a conventional flue gas output pipe, the other path is a low-temperature flue gas recirculation eduction pipe, the low-temperature flue gas recirculation eduction pipe is connected with a low-temperature flue gas recirculation fan,
the air output end of the air preheater is connected with a hot secondary air bellows, the 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 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 a leading-out 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 connected with the central air nozzle of the pulverized coal burners through a central air pipe, and the central air pipe is provided with a non-metal expansion joint.
Preferably, the air quantity adjusting baffle for the drawn hot secondary air is driven by a motor.
Preferably, the conventional flue gas output pipe is connected with a chimney through an induced draft fan.
The utility model has the advantages that: the utility model discloses a combustor central wind comprises low temperature recirculation flue gas and hot overgrate air jointly, through the ratio of adjustment low temperature recirculation flue gas volumn and hot overgrate air, can the effectual control pulverized coal burner export buggy ignition, avoids because the ignition leads to the condition of combustor spout coking or loss of burning too closely. The central air speed of the pulverized coal burner is improved by adjusting the output of the flue gas recirculation fan and the opening of the hot secondary air volume adjusting baffle, so that the central air speed is far higher than the primary air speed, a central negative pressure area is formed between the central air and the primary air, the situations of premature divergence and wall brushing of primary air and pulverized coal airflow are avoided, the problem of large-area coke hanging of a guard burning zone and a water cooling wall around the pulverized coal burner is solved, and the problem of large-area coking and burning loss of the burner of the high-sodium metal coal burning boiler is effectively suppressed.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-a boiler; 2-an air preheater; 3, an electric dust remover; 4-a conventional flue gas output pipe; 5-low temperature flue gas recirculation outlet pipe; 6-low temperature flue gas recirculation fan; 7-leading out a hot secondary air volume adjusting baffle; 8-non-metallic expansion joints; 9-pulverized coal burner;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention will be further described with reference to the following examples:
a boiler low-temperature flue gas recirculation combustion system comprises a boiler 1, a smoke 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 duct 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 bellows, the output air duct 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 a hot secondary air duct, the other path is combined with the output pipe of the warm secondary air lead-out pipe and the output pipe of the warm flue gas recirculation fan 6 through the hot secondary air lead-out pipe, the hot secondary air lead-out pipe is provided with a lead-out hot secondary air volume adjusting baffle 7, the output pipe of the low temperature flue gas recirculation fan 6 is combined with the hot secondary air lead-out pipe and then connected with a central air nozzle of the pulverized coal burners 9 through a central air duct.
Preferably, the hot secondary air outlet quantity adjusting baffle 7 is driven by a motor.
Preferably, the conventional flue gas output pipe 4 is connected with a chimney through an induced draft fan.
The utility model discloses during the use, concrete step is as follows:
the oxygen content of the central air and the air speed of the central air of the pulverized coal burner 9 are adjusted by adjusting the output power of the low-temperature flue gas recirculation fan 6 and the opening of the air quantity adjusting baffle 7 for leading out hot secondary air, so that the position of an ignition point of the pulverized coal burner 9 and the rigidity of air-powder airflow are adjusted.
Preferably, the specific steps are as follows: the central air 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 air led out regulating baffle 7, so that the central air speed is far higher than the primary air speed, and a central negative pressure area is formed between the primary air and the central air of the pulverized coal burner 9, so that the phenomenon that primary air airflow is diffused too early and walls are brushed is avoided.
Preferably, the ignition point of the pulverized coal burner 9 is far away from the pulverized coal burner 9 nozzle by reducing the proportion of hot secondary air in the central air, so as to avoid large-area coke hanging.
The utility model discloses a combustor central wind comprises low temperature recirculation flue gas and hot overgrate air jointly, through the ratio of adjustment low temperature recirculation flue gas volumn and hot overgrate air, can 9 export buggy ignition of effectual control pulverized coal burner, avoids because the ignition leads to the condition of combustor spout coking or loss of burning too closely. The central air speed of the pulverized coal burner 9 is improved by adjusting the output of the flue gas recirculation fan and the opening of the hot secondary air volume adjusting baffle 7, so that the central air speed is far higher than the primary air speed, a central negative pressure area is formed between the central air and the primary air, the situations of premature divergence and wall brushing of primary air and powder airflow are avoided, the problems of large-area coking and burning loss of a burning high-sodium metal coal burner in a large area around the pulverized coal burner 9 are solved, and the problems of large-area coking and burning loss of the burning high-sodium metal coal burner can be effectively suppressed.
Example one
The oxygen content of the central air and the air speed of the central air of the pulverized coal burner 9 are adjusted by adjusting the output power of the low-temperature flue gas recirculation fan 6 and the opening of the air quantity adjusting baffle 7 for leading out hot secondary air, 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 burning boiler burner are effectively inhibited, and the conditions of coking and burning loss of the pulverized coal nozzle and the inner part of the high-sodium metal coal burning boiler caused by the early ignition of the pulverized coal burner 9 are avoided.
Example two
The central air speed of the pulverized coal burner 9 is increased by adjusting the output power of the low-temperature flue gas recirculation fan 6 and the opening of the hot secondary air led out regulating baffle 7, so that the central air speed is far higher than the primary air speed, a central negative pressure area is formed between the primary air and the central air of the pulverized coal burner 9, the phenomenon that the primary air and the pulverized coal airflow are diffused too early and brushed on walls is avoided, and the problem that a burning protection belt and a water cooling wall around the burner are burnt in a large area is solved.
Before the system of the utility model is adopted, the boiler burning the high-sodium coal needs to be decoked more than twice per eight hours on average; adopt the utility model discloses behind the system, then need not to carry out artifical decoking, saved unit maintenance time, improved production efficiency.
The present invention has been described above with reference to the specific embodiments, and it is obvious that the present invention is not limited by the above-mentioned manner, and various improvements made by the method concept and technical solution of the present invention or directly applied to other occasions without improvement are all within the protection scope of the present invention.
Claims (3)
1. A boiler low-temperature flue gas recirculation combustion system comprises a boiler (1) and is characterized in that 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 duct 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 lead-out pipe (5), the low-temperature flue gas recirculation lead-out 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 bellows, the output air duct 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 a hot secondary air duct, the other path is combined with the output pipe of the warm flue gas recirculation fan (6) through an overheated secondary air eduction tube, the hot secondary air eduction tube is provided with a leading-out hot secondary air volume adjusting baffle plate (7), the output pipe of the low-temperature flue gas recirculation fan (6) is combined with the hot secondary air eduction tube and then connected with a central air nozzle of the pulverized coal burners (9) through a central air duct, and the central air duct is provided with a non-metal expansion joint (.
2. The boiler low-temperature flue gas recirculation combustion system according to claim 1, wherein the outlet hot secondary air volume adjusting baffle (7) is driven by a motor.
3. The boiler low-temperature flue gas recirculation combustion system according to claim 1, wherein the conventional flue gas output pipe (4) is connected with a chimney through an induced draft fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920348306.4U CN209876904U (en) | 2019-03-19 | 2019-03-19 | Boiler low-temperature flue gas recirculation combustion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920348306.4U CN209876904U (en) | 2019-03-19 | 2019-03-19 | Boiler low-temperature flue gas recirculation combustion system |
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| CN209876904U true CN209876904U (en) | 2019-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827169A (en) * | 2019-03-19 | 2019-05-31 | 中国能源建设集团华北电力试验研究院有限公司 | A kind of boiler low-temperature fume recycle burning system and its application method |
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2019
- 2019-03-19 CN CN201920348306.4U patent/CN209876904U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827169A (en) * | 2019-03-19 | 2019-05-31 | 中国能源建设集团华北电力试验研究院有限公司 | A kind of boiler low-temperature fume recycle burning system and its application method |
| CN109827169B (en) * | 2019-03-19 | 2023-09-26 | 中国能源建设集团华北电力试验研究院有限公司 | Boiler low-temperature flue gas recirculation combustion system and application method thereof |
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