CN210485788U - Primary air mixing device for pulverized coal boiler of power station - Google Patents

Primary air mixing device for pulverized coal boiler of power station Download PDF

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Publication number
CN210485788U
CN210485788U CN201921269364.4U CN201921269364U CN210485788U CN 210485788 U CN210485788 U CN 210485788U CN 201921269364 U CN201921269364 U CN 201921269364U CN 210485788 U CN210485788 U CN 210485788U
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pipeline
air
boiler
primary air
coal
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CN201921269364.4U
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张小弟
李冬阳
赵春辉
任立立
邸艳龙
赵桐
于晶
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Beijing Guodian Longgaoke Environment Engineering & Technology Co ltd
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Beijing Guodian Longgaoke Environment Engineering & Technology Co ltd
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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

Abstract

A primary air mixing device and a boiler system for a pulverized coal boiler of a power station belong to the technical field of boilers and aim to solve the problems that the existing power station boiler can only be suitable for high-quality single coal types and cannot give consideration to the high-quality single coal types, and the existing power station boiler can cause NO (nitric oxide) due to the fact that the coal types with poor combustion quality can cause the poor combustion qualityXThe problem of high emission. The utility model comprises a mixing bellows, a high temperature flue gas pipeline, a cold air pipeline, an exhaust gas pipeline, a cold air blower, a primary air blower and a primary air pipeline; the mixed air box is communicated with an air preheater at the tail part of the boiler through a high-temperature flue gas pipeline, and a cold air pipeline is connected with the mixed air boxAnd the cold air pipeline is provided with a cold air fan, the mixing air box is communicated with an air outlet at the tail part of the powder making device through an exhaust air pipeline, and a discharge port of the powder making device is communicated with the primary air pipeline. The utility model discloses satisfy the demand that the coal pulverizer can grind other coal types, improve the compatibility that the coal pulverizer can grind other coal types to reduce NO when making the boiler burn inferior varietyXThe emission of (2) and the cost are reduced.

Description

Primary air mixing device for pulverized coal boiler of power station
Technical Field
The utility model relates to an air mixing arrangement for power plant pulverized coal boiler belongs to boiler technical field.
Background
The coal pulverizing system is an important component of a combustion system of a pulverized coal boiler of a power station, and is mainly used for preparing and conveying pulverized coal and providing a pulverized coal mixture with qualified fineness and air-powder mixture with proper temperature for the boiler. The pulverized coal boiler can be divided into a lean coal boiler, an anthracite boiler and a bituminous coal boiler and a lignite boiler according to different pulverized coal fuel properties, and a proper pulverizing system is selected according to different designed coal types. Typically, a coal pulverizing system is suitable for only one type of coal. The conventional intermediate storage bin type steel ball coal mill system is reliable in operation and high in coal adaptability, anthracite and lean coal can be milled, a hot air powder feeding mode with high primary air-powder mixture temperature is generally selected for a lean coal and anthracite boiler, an exhaust gas powder feeding mode with low primary air-powder mixture temperature is generally selected for a bituminous coal boiler, once the powder feeding mode is selected, the bituminous coal boiler can only be suitable for one type of coal, and along with the increasing environmental protection requirement, the existing power station boiler can cause NO due to the fact that the coal type with poor combustion quality can cause the generation of NOXThe emission is higher, therefore, the combustion boiler of the existing power station can only burn coal with higher quality, and cannot give consideration to other coal types, so that the operation cost of the power station is higher.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the relatively poor coal type of current power plant boiler burning quality and can cause NOXHigh discharge, noThe method can solve the problems of other coal types and provides a primary air mixing device for a pulverized coal boiler of a power station.
The utility model discloses a solve the technical scheme that above-mentioned technical problem took and be:
a primary air mixing device for a pulverized coal boiler of a power station comprises a mixing air box, a high-temperature flue gas pipeline, a cold air pipeline, an exhaust air pipeline, a cold air fan, a primary air fan and a primary air pipeline;
the mixing air box is communicated with an air preheater at the tail part of the boiler through a high-temperature flue gas pipeline, the cold air pipeline is communicated with the mixing air box, a cold air fan is arranged on the cold air pipeline, the mixing air box is communicated with an air outlet at the tail part of the powder making device through an exhaust gas pipeline, a discharge outlet of the powder making device is communicated with a primary air pipeline, one end of the primary air pipeline is communicated with a boiler burner, the other end of the primary air pipeline is communicated with the mixing air box, and a primary air fan is arranged on the primary air.
Furthermore, the high-temperature flue gas pipeline is communicated with a high-speed OFA nozzle on the boiler through a pipeline, and an air adjusting door is arranged on the pipeline between the high-temperature flue gas pipeline and the high-speed OFA nozzle on the boiler.
Furthermore, the powder making device comprises a coal mill, a coarse powder separator, a fine powder separator, a coal feeder and a powder bin;
the discharge port of the coal feeder is connected with the feed inlet of the coal mill, the ash hopper of the coarse powder separator and the discharge port of the coal feeder are respectively connected with the feed inlet of the coal mill through pipelines, the discharge port of the coarse powder separator is connected with the feed inlet of the fine powder separator through a pipeline, the discharge port of the fine powder separator is connected with the feed inlet of the powder bin, and the discharge port of the powder bin is communicated with the boiler burner through the primary air pipeline.
Furthermore, the high-temperature flue gas pipeline and the cold air pipeline are respectively communicated with an air inlet of the coal mill through a mixing pipeline, and the mixing pipeline is communicated with a smoke exhaust pipe on the air preheater through a low-temperature smoke exhaust pipeline.
Furthermore, a low-temperature smoke exhaust fan and an air adjusting door are arranged on the low-temperature smoke exhaust pipeline.
Furthermore, air doors are arranged at the high-temperature flue gas inlet and the cold air inlet of the mixed air box which are respectively connected with the high-temperature flue gas pipeline and the cold air pipeline.
Compared with the prior art, the utility model following beneficial effect has:
one, the utility model discloses a sneak into high temperature flue gas and low temperature flue gas in with the coal pulverizer to change the temperature of mixing the flue gas through air damper, the rethread mixes the oxygen content that the air changes the mixed flue gas into, can grind the demand of other coal types with satisfying the coal pulverizer, improve the compatibility that the coal pulverizer can grind other coal types.
Two, the utility model discloses boiler system sneaks into the mixed bellows through the exhaust steam of high temperature flue gas, air and the coal pulverizer with air heater exhaust to mix with the buggy and send into the combustor, make a wind buggy burning more stable through the mixture of this kind of high temperature hypoxemia, and reduce NOXAnd high-temperature flue gas is introduced into a high-speed OFA nozzle, so that the oxygen content of a main combustion area of the boiler is reduced, the reducing atmosphere of the main combustion area is increased, and NO is further reducedXSo that NO is generated at the tail of the boilerXThe environmental protection characteristic of the boiler is reduced and improved. The utility model discloses in using the boiler with a wind mixing arrangement, can make current power plant boiler can be applicable to burning the inferior coal kind to reduce NOXThe emission of (2) and the cost are reduced.
Thirdly, the utility model discloses air door on each pipeline carries the flue gas or all does not contain the buggy, avoids the wearing and tearing of air door, provides the life of air door.
Drawings
Fig. 1 is a schematic view of a primary air mixing device.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, and includes a mixed air bellow 1, a high-temperature flue gas pipeline 2, a cold air pipeline 3, an exhaust gas pipeline 4, a cold air fan 6, a primary air fan 7 and a primary air pipeline 8;
mix bellows 1 and communicate through the air heater 16 of high temperature flue gas pipeline 2 and boiler afterbody, cold air duct 3 and mixed bellows 1 intercommunication, be equipped with cold air fan 6 on the cold air duct 3, mixed bellows 1 communicates through the gas vent of exhaust pipe way 4 with powder process device 9 afterbody, powder process device 9's bin outlet and primary air pipeline 8 intercommunication, primary air pipeline 8's one end and boiler combustor intercommunication, primary air pipeline 8's the other end and mixed bellows 1 intercommunication, be equipped with primary air fan 7 on the primary air pipeline 8.
The inlet of the powder making device 9 is filled with exhaust gas (air with lower oxygen content), and finally the powder making device 9 is communicated with the mixing bellows 1 through an exhaust gas pipeline 4.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, the high-temperature flue gas duct 2 of the embodiment is further communicated with the high-speed OFA nozzles 17 on the boiler through a duct, and a damper B15 is arranged on the duct between the high-temperature flue gas duct 2 and the high-speed OFA nozzles 17 on the boiler.
So set up, can adjust a wind temperature, reduce the hot primary air amount of wind of main burning zone in the boiler, further reduce the oxygen content in main burning zone, improve the reducing atmosphere in main burning zone, reduce NOXEffective reduction of NOXThe environment-friendly performance of the boiler is improved.
Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 1, and the pulverizing device 9 of the embodiment comprises a coal mill 9-1, a coarse powder separator 9-2, a fine powder separator 9-3, a coal feeder 9-4 and a powder bin 9-5;
the discharge port of the coal feeder 9-4 is connected with the feed port of the coal mill 9-1, the ash hopper of the coarse powder separator 9-2 and the discharge port of the coal feeder 9-4 are respectively connected with the feed port of the coal mill 9-1 through pipelines, the discharge port of the coarse powder separator 9-2 is connected with the feed port of the fine powder separator 9-3 through a pipeline, the discharge port of the fine powder separator 9-3 is connected with the feed port of the powder bin 9-5, and the discharge port of the powder bin 9-5 is communicated with the boiler burner through the primary air pipeline 8.
Other components and connections are the same as in the first embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, in the embodiment, the high-temperature flue gas pipeline 2 and the cold air pipeline 3 are respectively communicated with an air inlet of the coal mill 9-1 through a mixing pipeline 10, and the mixing pipeline 10 is communicated with a smoke exhaust pipe 12 on the air preheater 16 through a low-temperature smoke exhaust pipeline 11.
The utility model discloses in getting into coal pulverizer 9-1 through hybrid piping 10 after mixing the high temperature flue gas of boiler afterbody, air and low temperature flue gas, improve coal pulverizer 9-1's coal type adaptability, finally let in hybrid bellows 1 through exhaust pipe 4 with the exhaust of mixing, in the hybrid bellows 1 with the high temperature flue gas, during mixed exhaust and air mix together and send into the boiler combustor through a primary air pipeline 8, the one-time wind that has the uniform temperature on the one hand can improve the stability of corresponding coal type burning in the boiler combustor, improve boiler combustion system's security. On the other hand, low-temperature furnace smoke is pumped to be used as part of powder making medium, and because the oxygen content of the exhaust gas is lower, the oxygen content of the mixed gas in the mixed wind box 1 is lower, so that the primary air mixture is in an anoxic state during combustion, a reducing atmosphere is formed, and NO in the initial stage of combustion is reducedXAnd (4) generating.
Other compositions and connection relations are the same as those of the third embodiment.
The fifth concrete implementation mode: referring to fig. 1, the embodiment will be described, and a low-temperature smoke exhaust fan 13 and a damper a14 are provided in the low-temperature smoke exhaust duct 11 according to the embodiment.
So set up, conveniently adjust the temperature of flue gas.
Other compositions and connection relations are the same as those of the fourth embodiment.
The sixth specific implementation mode: the present embodiment will be described with reference to fig. 1, and the high-temperature flue gas inlet and the cold air inlet of the mixing air box (1) connected to the high-temperature flue gas duct (2) and the cold air duct (3) respectively in the present embodiment are provided with air doors.
So set up, conveniently adjust the oxygen content of mixed flue gas and the temperature of mixed flue gas.
Other components and connections are the same as in the first embodiment.

Claims (6)

1. The utility model provides a wind mixing arrangement for power plant pulverized coal boiler which characterized in that: the device comprises a mixed air box (1), a high-temperature flue gas pipeline (2), a cold air pipeline (3), an exhaust gas pipeline (4), a cold air fan (6), a primary air fan (7) and a primary air pipeline (8);
mix bellows (1) and air heater (16) intercommunication through high temperature flue gas pipeline (2) and boiler afterbody, cold air duct (3) and mixed bellows (1) intercommunication, be equipped with cold air fan (6) on cold air duct (3), mixed bellows (1) are through exhaust pipe (4) and the gas vent intercommunication of powder process device (9) afterbody, the bin outlet and the primary air pipeline (8) intercommunication of powder process device (9), the one end and the boiler combustor intercommunication of primary air pipeline (8), the other end and mixed bellows (1) intercommunication of primary air pipeline (8), be equipped with primary air fan (7) on primary air pipeline (8).
2. The primary air mixing device for a pulverized coal fired power plant boiler as claimed in claim 1, characterized in that: the high-temperature flue gas pipeline (2) is further communicated with a high-speed OFA nozzle (17) on the boiler through a pipeline, and an air adjusting door B (15) is arranged on the pipeline between the high-temperature flue gas pipeline (2) and the high-speed OFA nozzle (17) on the boiler.
3. The primary air mixing device for a pulverized coal fired power plant boiler as claimed in claim 1, characterized in that: the powder making device (9) comprises a coal mill (9-1), a coarse powder separator (9-2), a fine powder separator (9-3), a coal feeder (9-4) and a powder bin (9-5);
the discharge port of the coal feeder (9-4) is connected with the feed port of the coal mill (9-1), the ash hopper of the coarse powder separator (9-2) and the discharge port of the coal feeder (9-4) are respectively connected with the feed port of the coal mill (9-1) through pipelines, the discharge port of the coarse powder separator (9-2) is connected with the feed port of the fine powder separator (9-3) through a pipeline, the discharge port of the fine powder separator (9-3) is connected with the feed port of the powder bin (9-5), and the discharge port of the powder bin (9-5) is communicated with a boiler burner through the primary air pipeline (8).
4. The primary air mixing device for pulverized coal fired power plants as claimed in claim 3, characterized in that: the high-temperature flue gas pipeline (2) and the cold air pipeline (3) are respectively communicated with an air inlet of the coal mill (9-1) through a mixing pipeline (10), and the mixing pipeline (10) is communicated with a smoke exhaust pipe (12) on the air preheater (16) through a low-temperature smoke exhaust pipeline (11).
5. The primary air mixing device for pulverized coal fired power plants as claimed in claim 4, characterized in that: and the low-temperature smoke exhaust pipeline (11) is provided with a low-temperature smoke exhaust fan (13) and an air damper A (14).
6. The primary air mixing device for a pulverized coal fired power plant boiler as claimed in claim 1, characterized in that: the high-temperature flue gas inlet and the cold air inlet of the mixed air box (1) which are respectively connected with the high-temperature flue gas pipeline (2) and the cold air pipeline (3) are respectively provided with an air door.
CN201921269364.4U 2019-08-06 2019-08-06 Primary air mixing device for pulverized coal boiler of power station Active CN210485788U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921269364.4U CN210485788U (en) 2019-08-06 2019-08-06 Primary air mixing device for pulverized coal boiler of power station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921269364.4U CN210485788U (en) 2019-08-06 2019-08-06 Primary air mixing device for pulverized coal boiler of power station

Publications (1)

Publication Number Publication Date
CN210485788U true CN210485788U (en) 2020-05-08

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CN201921269364.4U Active CN210485788U (en) 2019-08-06 2019-08-06 Primary air mixing device for pulverized coal boiler of power station

Country Status (1)

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CN (1) CN210485788U (en)

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