CN113188120A - Air quantity and rotational flow double-regulation burner - Google Patents
Air quantity and rotational flow double-regulation burner Download PDFInfo
- Publication number
- CN113188120A CN113188120A CN202110602982.1A CN202110602982A CN113188120A CN 113188120 A CN113188120 A CN 113188120A CN 202110602982 A CN202110602982 A CN 202110602982A CN 113188120 A CN113188120 A CN 113188120A
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- Prior art keywords
- secondary air
- air duct
- rotational flow
- burner
- adjusting device
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 239000003245 coal Substances 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 4
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 238000010304 firing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
A double-regulation burner with air volume and rotational flow comprises a primary air duct, a central air duct, a primary air duct, a central air duct and a secondary air duct, wherein outlets of the primary air duct and the central air duct are connected with the burner; the secondary air duct comprises an inner secondary air duct and an outer secondary air duct, an inner secondary air duct air quantity adjusting device and an inner secondary air duct rotational flow strength adjusting device are arranged in the inner secondary air duct, and an outer secondary air duct air quantity adjusting device and an outer secondary air duct rotational flow strength adjusting device are arranged in the outer secondary air duct. The invention can realize independent adjustment of the secondary air quantity and the secondary air swirl strength without mutual influence, and can adjust the secondary air quantity and the secondary air swirl strength to optimal values under various working conditions so as to obtain stable combustion and a good in-furnace air dynamic field and avoid the defect that the secondary air swirl strength of the traditional burner can not be adjusted or the air quantity and the swirl strength can only be reversely adjusted.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to an air volume and rotational flow double-regulation burner.
Background
The combustion modes of the large-scale thermal power generating unit mainly include tangential circle combustion and opposed firing. The burner of the opposed firing boiler is a cyclone burner, and the guarantee of proper primary and secondary air volume and cyclone strength is of great importance. When the burner operates, the secondary air generates rotational flow with certain strength, so that high-temperature flue gas can be effectively sucked, the mixing of pulverized coal and flue gas is enhanced, and the rapid ignition and stable combustion of the pulverized coal are facilitated. For coal types with different volatile matters, the swirl strength and the air volume need to be properly adjusted in order to control a proper ignition point. Not only the burning loss and slag bonding of the burner caused by too close firing distance are avoided, but also the burning loss and unstable burning caused by the fire dropping of the burner caused by too far firing distance are avoided. When the combustor stops operating, ventilation cooling is needed, at the moment, the entrainment effect of the rotational flow secondary air can generate negative influence, and the key is enough secondary air quantity. If the swirl strength and the air volume can not be adjusted or can not be independently adjusted, one parameter is increased or decreased, the other parameter can be fixedly changed, which is not favorable for the flexible adjustment of the operation and standby of the burner. In a thermal power generating unit in service, the cyclone burner often has the defect of the design. The swirl strength of part of the burners cannot be adjusted, and the burners have poor adaptability to coal types and are easy to burn. The secondary air quantity and the swirl of part of the burner are adjusted by changing the distance between the adjusting element and the burner nozzle, when the adjusting element is closest to the burner nozzle, the secondary air quantity is minimum, and the swirl strength of the secondary air is strongest; when the adjusting element is farthest away from the outer secondary air inlet, the air quantity of the outer secondary air is the largest, and the swirling intensity of the outer secondary air is the weakest. Namely, the combination mode of the air volume and the rotational flow strength is limited, and flexible and independent adjustment cannot be achieved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide an air volume and rotational flow double-regulation burner, which can solve the problem that the air volume and the rotational flow strength cannot be independently regulated, can respectively and independently regulate the air volume and the rotational flow strength of secondary air according to different working conditions of a boiler so as to obtain a good air power field in the boiler, avoid a series of problems of slag bonding, high-temperature corrosion, large smoke temperature deviation and the like, and provide an effective regulation means for safe and stable operation of the boiler.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-regulation burner with air volume and rotational flow comprises a primary air duct, a central air duct, a primary air duct, a central air duct and a secondary air duct, wherein outlets of the primary air duct and the central air duct are connected with the burner;
the secondary air duct comprises an inner secondary air duct and an outer secondary air duct, an inner secondary air duct air quantity adjusting device and an inner secondary air duct rotational flow strength adjusting device are arranged in the inner secondary air duct, and an outer secondary air duct air quantity adjusting device and an outer secondary air duct rotational flow strength adjusting device are arranged in the outer secondary air duct.
The invention is further improved in that the primary air pipe inlet is provided with a primary air pipe inlet isolation door.
The invention is further improved in that a central air pipe air quantity adjusting device is arranged in the central air pipe.
The invention is further improved in that the air quantity adjusting device of the inner secondary air duct and the air quantity adjusting device of the outer secondary air duct are baffles or gate doors.
The invention is further improved in that the number of the inner secondary air duct air quantity adjusting devices and the number of the outer secondary air duct air quantity adjusting devices are multiple.
The invention is further improved in that the inner secondary air duct rotational flow intensity adjusting device and the outer secondary air duct rotational flow intensity adjusting device are guide vanes or cyclones.
The invention is further improved in that the number of the inner secondary air duct swirl strength adjusting devices and the number of the outer secondary air duct swirl strength adjusting devices are multiple.
The invention has the further improvement that when the burner is operated, if the volatile content of the coal as fired is increased, the swirl strength of the secondary air is reduced by the inner secondary air swirl strength adjusting device and the outer secondary air swirl strength adjusting device, so that the burner is prevented from being burnt and damaged due to the over-close ignition distance of the pulverized coal; if the load of the boiler is changed, the secondary air quantity is changed through the outer secondary air duct air quantity adjusting device and the outer secondary air duct air quantity adjusting device so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
The invention has the further improvement that when the burner is operated, if the volatile content of the coal as fired is reduced, the swirl strength of the secondary air is increased by the inner secondary air duct swirl strength adjusting device and the outer secondary air duct swirl strength adjusting device; if the load of the boiler is changed, the secondary air quantity is changed through the outer secondary air duct air quantity adjusting device and the outer secondary air duct air quantity adjusting device so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
The invention is further improved in that when the burner is out of service, the swirl strength is adjusted to zero by the inner secondary air duct swirl strength adjusting device and the outer secondary air duct swirl strength adjusting device.
Compared with the prior art, the invention has the beneficial effects that: the invention can realize independent adjustment of the secondary air quantity and the secondary air swirl strength without mutual influence, and can adjust the secondary air quantity and the secondary air swirl strength to optimal values under various working conditions so as to obtain stable combustion and a good in-furnace air dynamic field and avoid the defect that the secondary air swirl strength of the traditional burner can not be adjusted or the air quantity and the swirl strength can only be reversely adjusted.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure, 1 is a primary air duct, 2 is a central air duct, 3 is a secondary air duct, 4 is an inner secondary air duct air quantity adjusting device, 5 is an inner secondary air duct rotational flow intensity adjusting device, 6 is an outer secondary air duct air quantity adjusting device, 7 is an outer secondary air duct rotational flow intensity adjusting device, 8 is a central air duct air quantity adjusting device, and 9 is a primary air duct inlet isolation door.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the burner of the present invention is composed of a primary air pipe 1, a central air pipe 2, an air volume adjusting device and a swirl intensity adjusting device. The air quantity regulating device can be a baffle, a gate or other mechanical devices, and the rotational flow strength regulating device can be a guide vane, a cyclone or other mechanical devices. The outlets of the primary air pipe 1, the central air pipe 2 and the secondary air duct 3 are all connected with the burner.
Specifically, the secondary air duct 3 includes an inner secondary air duct and an outer secondary air duct, a plurality of inner secondary air duct air volume adjusting devices 4 and inner secondary air duct swirl intensity adjusting devices 5 are provided in the inner secondary air duct, and a plurality of outer secondary air duct air volume adjusting devices 6 and outer secondary air duct swirl intensity adjusting devices 7 are provided in the outer secondary air duct.
The inlet of the primary air pipe 1 is provided with a primary air pipe inlet isolation door 9, and the inside of the central air pipe 2 is provided with a central air pipe air quantity adjusting device 8.
When the burner is operated, if the volatile content of the coal as fired is increased, the swirl strength of the secondary air can be properly reduced through the inner secondary air channel swirl strength adjusting device 5 and the outer secondary air channel swirl strength adjusting device 7, so that the phenomenon that the secondary air quantity is unchanged when the pulverized coal is ignited at an excessively short distance and the burner is burnt is avoided. If the load is changed, the secondary air quantity can be changed through the inner secondary air duct air quantity adjusting device 4 and the outer secondary air duct air quantity adjusting device 6 so as to fit a load-oxygen quantity curve given by a combustion adjustment test, and at the moment, the rotational flow strength is unchanged. Therefore, the secondary air quantity and the swirl strength required by the burner can reach the optimal values under the working condition.
When the burner is out of service, secondary air is needed to cool the burner nozzle. At the moment, the rotational flow intensity is adjusted to be zero through the inner secondary air duct rotational flow intensity adjusting device 5 and the outer secondary air duct rotational flow intensity adjusting device 7, namely, the secondary air is direct-current air, so that the best cooling effect is obtained, and the deformation caused by burning loss of high-temperature flue gas during the shutdown is avoided.
Example 1
Referring to fig. 1, when the burner is operated, if the volatile content of the coal as fired is increased, the swirl strength of the secondary air can be properly reduced by the inner secondary air swirl strength adjusting device 5 and the outer secondary air swirl strength adjusting device 7, so that the phenomenon that the burner is burnt and damaged due to too short ignition distance of the coal powder is avoided, and the secondary air volume is not changed. If the load of the boiler is changed, the secondary air quantity can be changed through the outer secondary air duct air quantity adjusting device 4 and the outer secondary air duct air quantity adjusting device 6 so as to fit a load-oxygen quantity curve given by a combustion adjustment test, and at the moment, the rotational flow strength is unchanged. Therefore, the secondary air quantity and the swirl strength required by the burner can reach the optimal values under the working condition.
When the burner is operated, if the volatile content of the coal as fired is reduced, the swirl strength of the secondary air can be properly increased through the inner secondary air duct swirl strength adjusting device 5 and the outer secondary air duct swirl strength adjusting device 7, so that the phenomenon that the burner is off fire due to the fact that the ignition distance of the coal powder is too far is avoided; meanwhile, the capability of secondary air for absorbing high-temperature flue gas is enhanced, enough heat is provided for the initial ignition and the middle and later period stable combustion of the pulverized coal, the stability of flame in the furnace is ensured, and the secondary air quantity is unchanged. If the load of the boiler is changed, the secondary air quantity can be changed through the outer secondary air duct air quantity adjusting device 4 and the outer secondary air duct air quantity adjusting device 6 so as to fit a load-oxygen quantity curve given by a combustion adjustment test, and at the moment, the rotational flow strength is unchanged. Therefore, the secondary air quantity and the swirl strength required by the burner can reach the optimal values under the working condition.
When the burner is out of service, secondary air is needed to cool the burner nozzle. At the moment, the rotational flow intensity is adjusted to be zero through the inner secondary air duct rotational flow intensity adjusting device 5 and the outer secondary air duct rotational flow intensity adjusting device 7, namely, the secondary air is direct-current air, so that the best cooling effect is obtained, and the deformation caused by burning loss of high-temperature flue gas during the shutdown is avoided.
Claims (10)
1. The burner with double regulation of air volume and rotational flow is characterized by comprising a primary air pipe (1), a central air pipe (2), the primary air pipe (1), the central air pipe (2) and a secondary air duct (3), wherein the outlets of the primary air pipe, the central air pipe and the secondary air duct are connected with the burner;
the secondary air duct (3) comprises an inner secondary air duct and an outer secondary air duct, an inner secondary air duct air quantity adjusting device (4) and an inner secondary air duct rotational flow strength adjusting device (5) are arranged in the inner secondary air duct, and an outer secondary air duct air quantity adjusting device (6) and an outer secondary air duct rotational flow strength adjusting device (7) are arranged in the outer secondary air duct.
2. An air volume and rotational flow double-regulation burner as claimed in claim 1, characterized in that the primary air duct (1) inlet is provided with a primary air duct inlet isolation door (9).
3. The burner with double regulation of air volume and rotational flow as claimed in claim 1, characterized in that the central air duct (2) is internally provided with a central air duct air volume regulation device (8).
4. The burner of claim 1, wherein the inner secondary air duct air volume adjusting device (4) and the outer secondary air duct air volume adjusting device (6) are baffles or gate doors.
5. The burner of claim 1, wherein the inner secondary air duct air volume adjusting device (4) and the outer secondary air duct air volume adjusting device (6) are plural.
6. The air volume and rotational flow double-regulation burner as claimed in claim 1, wherein the inner secondary air duct rotational flow intensity regulation device (5) and the outer secondary air duct rotational flow intensity regulation device (7) are guide vanes or cyclones.
7. The burner of claim 1, wherein the number of the inner secondary air duct swirl strength adjusting devices (5) and the outer secondary air duct swirl strength adjusting devices (7) is plural.
8. The burner with double regulation of air volume and rotational flow according to claim 1, characterized in that when the burner is operated, if the volatile matter of coal as fired is increased, the rotational flow intensity of the secondary air is reduced by the inner secondary air rotational flow intensity regulating device (5) and the outer secondary air rotational flow intensity regulating device (7), so that the burner is prevented from being burnt and damaged due to too close ignition distance of pulverized coal; if the load of the boiler is changed, the secondary air quantity is changed through the outer secondary air duct air quantity adjusting device (4) and the outer secondary air duct air quantity adjusting device (6) so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
9. The burner with double regulation of air volume and rotational flow as claimed in claim 1, wherein when the burner is operated, if the volatile matter of the coal as fired is reduced, the rotational flow intensity of the secondary air is increased by the inner secondary air duct rotational flow intensity regulating device (5) and the outer secondary air duct rotational flow intensity regulating device (7); if the load of the boiler is changed, the secondary air quantity is changed through the outer secondary air duct air quantity adjusting device (4) and the outer secondary air duct air quantity adjusting device (6) so as to fit a load-oxygen quantity curve given by a combustion adjustment test.
10. An air volume and rotational flow double-regulation burner as claimed in claim 1, characterized in that when the burner is not used, the rotational flow intensity is adjusted to zero by the inner secondary air duct rotational flow intensity adjusting device (5) and the outer secondary air duct rotational flow intensity adjusting device (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602982.1A CN113188120A (en) | 2021-05-31 | 2021-05-31 | Air quantity and rotational flow double-regulation burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602982.1A CN113188120A (en) | 2021-05-31 | 2021-05-31 | Air quantity and rotational flow double-regulation burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113188120A true CN113188120A (en) | 2021-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110602982.1A Pending CN113188120A (en) | 2021-05-31 | 2021-05-31 | Air quantity and rotational flow double-regulation burner |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272711A (en) * | 1992-03-25 | 1993-10-19 | Kawasaki Heavy Ind Ltd | Low nox burner with fine coal |
| KR19990079053A (en) * | 1998-04-01 | 1999-11-05 | 이해규 | Pulverized coal burner |
| CN1477330A (en) * | 2003-06-23 | 2004-02-25 | 西安交通大学 | Radial gradient two air-controlled cyclone coal dust combustor |
| US20100018445A1 (en) * | 2007-07-18 | 2010-01-28 | Harbin Institute Of Technology | Low Nox Swirl Coal Combustion Burner |
| CN102434878A (en) * | 2011-09-09 | 2012-05-02 | 华中科技大学 | Three-layer secondary air low nitrogen oxide swirling burner |
| CN203718768U (en) * | 2014-01-20 | 2014-07-16 | 武汉奥杰科技发展有限责任公司 | High-efficiency and energy-saving adjustable-type multi-coal-type pulverized coal burner |
| CN104832918A (en) * | 2015-05-05 | 2015-08-12 | 集美大学 | Novel cyclone bias pulverized coal burner |
| CN105782967A (en) * | 2014-12-25 | 2016-07-20 | 黑龙江宏宇电站设备有限公司 | Burning method of concentrated-thin type dual channel swirl burner of power station boiler |
| CN112032711A (en) * | 2020-09-28 | 2020-12-04 | 西安热工研究院有限公司 | Stable combustion burner based on temperature control of precombustion chamber and operation method thereof |
| CN112325285A (en) * | 2020-11-23 | 2021-02-05 | 西安热工研究院有限公司 | System and method for protecting combustor |
| CN215174993U (en) * | 2021-05-31 | 2021-12-14 | 西安热工研究院有限公司 | Air quantity and rotational flow double-regulation burner |
-
2021
- 2021-05-31 CN CN202110602982.1A patent/CN113188120A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272711A (en) * | 1992-03-25 | 1993-10-19 | Kawasaki Heavy Ind Ltd | Low nox burner with fine coal |
| KR19990079053A (en) * | 1998-04-01 | 1999-11-05 | 이해규 | Pulverized coal burner |
| CN1477330A (en) * | 2003-06-23 | 2004-02-25 | 西安交通大学 | Radial gradient two air-controlled cyclone coal dust combustor |
| US20100018445A1 (en) * | 2007-07-18 | 2010-01-28 | Harbin Institute Of Technology | Low Nox Swirl Coal Combustion Burner |
| CN102434878A (en) * | 2011-09-09 | 2012-05-02 | 华中科技大学 | Three-layer secondary air low nitrogen oxide swirling burner |
| CN203718768U (en) * | 2014-01-20 | 2014-07-16 | 武汉奥杰科技发展有限责任公司 | High-efficiency and energy-saving adjustable-type multi-coal-type pulverized coal burner |
| CN105782967A (en) * | 2014-12-25 | 2016-07-20 | 黑龙江宏宇电站设备有限公司 | Burning method of concentrated-thin type dual channel swirl burner of power station boiler |
| CN104832918A (en) * | 2015-05-05 | 2015-08-12 | 集美大学 | Novel cyclone bias pulverized coal burner |
| CN112032711A (en) * | 2020-09-28 | 2020-12-04 | 西安热工研究院有限公司 | Stable combustion burner based on temperature control of precombustion chamber and operation method thereof |
| CN112325285A (en) * | 2020-11-23 | 2021-02-05 | 西安热工研究院有限公司 | System and method for protecting combustor |
| CN215174993U (en) * | 2021-05-31 | 2021-12-14 | 西安热工研究院有限公司 | Air quantity and rotational flow double-regulation burner |
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