CN106969348B - Wall-attached wind box capable of preventing dust deposit - Google Patents
Wall-attached wind box capable of preventing dust deposit Download PDFInfo
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- CN106969348B CN106969348B CN201710347792.3A CN201710347792A CN106969348B CN 106969348 B CN106969348 B CN 106969348B CN 201710347792 A CN201710347792 A CN 201710347792A CN 106969348 B CN106969348 B CN 106969348B
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- box body
- air
- body plate
- bellows
- box
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- 239000000428 dust Substances 0.000 title description 4
- 238000010926 purge Methods 0.000 claims abstract description 18
- 230000008021 deposition Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract 4
- 238000007664 blowing Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 241000274582 Pycnanthus angolensis Species 0.000 claims 8
- 239000011087 paperboard Substances 0.000 claims 8
- 230000002265 prevention Effects 0.000 claims 4
- 238000009825 accumulation Methods 0.000 abstract description 9
- 230000001464 adherent effect Effects 0.000 abstract description 6
- 239000002956 ash Substances 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000004071 soot Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/008—Flow control devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
- F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
-
- 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
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
Abstract
The invention discloses an ash accumulation preventing adherent wind box, which comprises a wind box body and a wind box air inlet arranged on the body, wherein the body consists of an upper box body plate, a lower box body plate, a left box body plate, a right box body plate, a front box body plate and a rear box body plate, the rear box body plate is connected to a boiler water-cooling wall, an air outlet is arranged on the rear box body plate, the air outlet is communicated with adherent wind nozzles distributed on the boiler water-cooling wall, the adherent wind box also comprises a purging device and a flow equalizing device, and an included angle alpha between the lower box body plate and the rear box body plate is 20-60 degrees; the purging device is arranged at the clamping angle of the lower box body plate and the front box body plate and is a cavity connected with a high-pressure air source, and the cavity is provided with an air nozzle of which the nozzle direction is directed to the rear box body plate and the air flow direction is parallel to the lower box body plate; the air inlets of the bellows are multiple and distributed on the front box body plate; the flow equalizers are of a plurality of V-shaped structures distributed in the bellows body, each flow equalizer is respectively opposite to the bellows air inlet, and the V-shaped tip points to the bellows air inlet. The device can effectively solve the problem of ash deposition of the wall-attached wind box.
Description
Technical Field
The invention belongs to the technical field of electric power and power engineering, relates to an adherence wind technology for preventing high-temperature corrosion of a boiler water wall of a coal-fired power plant, and in particular relates to an adherence wind box for preventing dust accumulation.
Background
In order to meet the increasingly strict environmental protection requirements, the domestic coal-fired power plants are all modified by adopting a NOx control technology, and the main technical route adopted is a low-nitrogen combustion technology and an SCR flue gas denitration technology. The low-nitrogen combustion technology can effectively reduce the generation of NOx by adopting measures such as graded air distribution and the like, but brings serious high-temperature corrosion to the boiler. The high-temperature corrosion of the water-cooled wall of the boiler becomes a difficult problem to be solved in the safe operation of the coal-fired generator set at present. In order to relieve the high-temperature corrosion of the water-cooled wall, the design of a boiler plant, a design institute and related scientific research institutions provides an adherence wind device capable of improving the atmosphere of a water-cooled wall corrosion area. A small amount of wind is led from the secondary wind and is sent into the hearth through a nozzle arranged in a high-temperature corrosion serious area of the water-cooled wall, so that the oxygen content of a near-wall area of the water-cooled wall is improved, and the high-temperature corrosion of the water-cooled wall is prevented.
In order to cover the water-cooled wall corrosion area as large as possible and avoid the influence on the combustion structure, the wall-attached wind generally has the characteristics of small wind quantity and more nozzles. In order to provide air sources for a plurality of nozzles, the conventional wall-mounted air box is generally designed to have a large coverage, and is typically arranged as shown in fig. 1 and 2, wherein the wall-mounted air box is arranged on the back fire side of the water-cooled wall, and hot air enters from the two ends or the middle of the air box. Due to low air volume and small pressure head of the wall-attached air, the air flow velocity in the wall-attached air box is extremely unevenly distributed, so that the ash deposition phenomenon with different characteristics of the air box occurs (see fig. 1 and 2). In addition, due to the characteristics of small air volume of the adherence air, low air speed of a nozzle, small differential pressure between the air box and a hearth and the like, when slight positive pressure occurs in the hearth in the operation process, a large amount of coal ash and unburnt carbon particles can enter the air box, so that ash accumulation of the adherence air box is aggravated.
At present, related technology is proposed in China for solving the problem of dust accumulation in a wind box and a flue of a coal-fired boiler. Patent CN202709168U proposes a pulverized coal boiler wind box with a self-ash discharging function, patent CN203116049U proposes a boiler hot air wind box soot blowing system, patent CN101672479B proposes a soot blowing device for flue dust deposition, patent CN104180379B proposes a soot blowing method and device for a horizontal flue of a pi-shaped boiler, and patent CN105299667a proposes a soot blowing device for a circular flue of a coal-fired power plant. All of these techniques use high pressure gas to purge the deposited fly ash in the flue or duct to fluidize it and fly it, which is then carried by the flue gas stream or air stream and flows out of the flue or windbox. Unlike other wind boxes and flues of the boiler, the wall-attached wind box has low air speed and small wall-attached wind nozzle, and the low-flow-rate air flow cannot carry fly ash particles disturbed by the back blowing of high-pressure air out of the wind box. In addition, because the particles deposited in the bellows are relatively large, the particles contain unburned coke pieces with large particle sizes and multiple pores, and the high-pressure gas blowback can not effectively disturb the large-particle coke pieces.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an ash accumulation preventing adherent wind box.
The above purpose is achieved by the following technical scheme:
the wall-attached wind box for the boiler water-cooled wall comprises a wind box body and a wind box air inlet arranged on the body, wherein the wind box body consists of an upper box body plate, a lower box body plate, a left box body plate, a right box body plate, a front box body plate and a rear box body plate, the rear box body plate is connected to the boiler water-cooled wall, an air outlet is arranged on the rear box body plate and is communicated with wall-attached wind nozzles arranged on the boiler water-cooled wall, the wall-attached wind box also comprises a blowing device and a flow equalizing device, and an included angle alpha between the lower box body plate and the rear box body plate is 20-60 degrees; the purging device is arranged at the clamping angle of the lower box body plate and the front box body plate and is a cavity connected with a high-pressure air source, and the cavity is provided with an air nozzle of which the nozzle direction is directed to the rear box body plate and the air flow direction is parallel to the lower box body plate; the air inlets of the bellows are arranged in a plurality and distributed on the front box body plate; the flow equalizers are of a plurality of V-shaped structures distributed in the bellows body, each flow equalizer is respectively opposite to the bellows air inlet, and the V-shaped tip points to the bellows air inlet.
Preferably, the air nozzle of the purging device is composed of a plurality of circular nozzles or is a strip-shaped slit nozzle.
Preferably, the diameter of the circular nozzle is 8-12mm, and the interval is 50-150mm; the height of the strip-shaped gap nozzle is 5-15mm, and the width of the strip-shaped gap nozzle is the same as that of the front box body plate.
Preferably, the V-shaped included angle r of the flow equalization device is 110-150 degrees.
Preferably, the center height of the flow equalizing device is identical with that of the air inlet of the air box, the length of the V-shaped bottom edge L of the flow equalizing device is 1.2-1.8 times of the width of the air inlet of the air box, and the thickness of the flow equalizing device is 1.2-1.8 times of the height of the air inlet of the air box.
Preferably, the number of the air inlets of the bellows is 3, and the air inlets of the bellows are respectively arranged at 1/6, 1/2 and 5/6 of the width direction of the front box body plate.
Preferably, in order to control the air quantity of the adherence air, an electric regulating valve is arranged at the air inlet of the bellows.
Preferably, in order to adjust the air inlet amount of the air inlet of the air box, a flowmeter is arranged outside the valve of the air inlet of the air box.
Preferably, in order to control the purge frequency of the purge device, an electromagnetic valve is arranged at the air source inlet of the purge device.
The invention has the beneficial effects that:
1. according to the invention, a multi-inlet mode is adopted, and the flow equalization device is arranged, so that the uniformity of distribution of the flow field in the bellows can be effectively improved, the uniform entering of the wall-attached wind into the furnace is facilitated, and the problem of ash accumulation caused by too low local speed is prevented;
2. the lower box plate of the air box is designed to be of an inclined structure, and the blowing device capable of blowing the surface of the lower box body is arranged, so that the problem of ash accumulation of the wall-attached air box is effectively solved.
Drawings
FIG. 1 is a schematic diagram of a conventional wall-mounted wind box arrangement 1 and its internal ash deposition and flow velocity distribution;
FIG. 2 is a schematic diagram of a conventional wall-mounted windbox arrangement 2 and its internal ash deposition and flow velocity distribution;
FIG. 3 is a schematic view of an adherent wind box structure and its internal flow velocity distribution;
FIG. 4 is a schematic cross-sectional view of an adherent wind box according to the present patent;
FIG. 5 is a schematic view of a bellows purge orifice;
FIG. 6 is a schematic view of flow equalizers in an attached windbox;
wherein 1 is a bellows body, 1-1 is an upper box plate, 1-2 is a front box plate, 1-3 is a rear box plate, 1-4 is a lower box plate, 1-5 is a right box plate, 1-6 is a left box plate, 2 is a bellows air inlet, 3 is a boiler water-cooled wall, 4 is an electric regulating valve, 5 is a purging device, 5-1 is an air nozzle, 6 is a flow equalizing device, 7 is an electromagnetic valve, and 8 is a flowmeter.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the accompanying drawings.
The wall-attached air box for the boiler water wall as shown in fig. 3 and 4 comprises an air box body 1 and an air box air inlet 2 arranged on the air box body, wherein the air box body consists of an upper box body plate 1-1, a lower box body plate 1-4, a left box body plate 1-6, a right box body plate 1-5, a front box body plate 1-2 and a rear box body plate 1-3, the rear box body plate 1-3 is connected to the boiler water wall 3, an air outlet is arranged on the rear box body plate and is communicated with wall-attached air nozzles arranged on the boiler water wall 3, the air box further comprises a purging device 5 and a flow equalizing device 6, and an included angle alpha between the lower box body plate 1-4 and the rear box body plate 1-3 is 20-60 degrees. The blowing device 5 is arranged at the included angle between the lower box body plate 1-4 and the front box body plate 1-2 and is a cavity connected with a high-pressure air source, and the cavity is provided with an air nozzle 5-1 with a nozzle direction pointing to the rear box body plate 1-3 and an air flow direction parallel to the lower box body plate 1-4. The number of the air inlets 2 of the bellows is 3, and the air inlets are respectively arranged at 1/6, 1/2 and 5/6 of the width direction of the front box body plate 1-2. The flow equalizers 6 are 3V-shaped structures distributed in the bellows body 1, the included angle r is 110-150 degrees, each flow equalizer is respectively opposite to the bellows air inlet 2, and the V-shaped tip points to the bellows air inlet 2. The center height of the flow equalizing device 6 is identical to that of the air inlet 2 of the air box, the length of the V-shaped bottom edge L of the flow equalizing device is 1.2-1.8 times of the width of the air inlet of the air box, and the thickness of the flow equalizing device is 1.2-1.8 times of the height of the air inlet of the air box. Wherein the air nozzle 5-1 of the purging device 5 is composed of a plurality of circular nozzles or a strip-shaped slit nozzle as shown in fig. 5. The diameter of the circular nozzle is 8-12mm, and the interval is 50-150mm. The height of the strip-shaped gap nozzle is 5-15mm, and the width of the strip-shaped gap nozzle is the same as that of the front box body plate.
In order to control the air quantity of the wall-attached air, an electric regulating valve 4 is arranged at the air inlet 2 of the bellows.
In order to adjust the air intake of the air box air inlet, a flowmeter 8 is arranged outside the valve of the air box air inlet 2.
In order to control the purge frequency of the purge device, a solenoid valve 7 is arranged at the air source inlet of the purge device 5.
According to the invention, a multi-inlet mode is adopted, and the flow equalization device is arranged, so that the uniformity of distribution of the flow field in the bellows can be effectively improved, the uniform entering of the wall-attached wind into the furnace is facilitated, and the problem of ash accumulation caused by too low local speed is prevented; meanwhile, the lower box plate of the air box is of an inclined structure, and the blowing device capable of blowing the surface of the lower box body is arranged, so that the problem of ash accumulation of the attached air box is effectively solved.
The above-described embodiments are only for illustrating the gist of the present invention, but are not intended to limit the scope of the present invention. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides an prevent adherence wind bellows of deposition, includes the bellows body and locates the bellows air intake on the body, and the bellows body comprises last box board, lower box board, left box board, right box board, preceding box board and back box board, and back box board is connected on boiler water-cooling wall, is equipped with the air outlet on the back box board, and the air outlet communicates its characterized in that with the adherence wind spout of arranging on boiler water-cooling wall: the device also comprises a blowing device and a flow equalizing device, wherein an included angle alpha between the lower box body plate and the rear box body plate is 20-60 degrees; the purging device is arranged at the clamping angle of the lower box body plate and the front box body plate and is a cavity connected with a high-pressure air source, and the cavity is provided with an air nozzle of which the nozzle direction is directed to the rear box body plate and the air flow direction is parallel to the lower box body plate; the air inlets of the bellows are arranged in a plurality and distributed on the front box body plate; the flow equalizers are of a plurality of V-shaped structures distributed in the bellows body, each flow equalizer is respectively opposite to the bellows air inlet, and the V-shaped tip points to the bellows air inlet;
the air nozzle of the purging device consists of a plurality of circular nozzles or is a strip-shaped gap nozzle;
the number of the air inlets of the bellows is 3, and the air inlets are respectively arranged at 1/6, 1/2 and 5/6 of the width direction of the front box body plate.
2. The ash deposit prevention wall-attached wind box according to claim 1, wherein: the diameter of the circular nozzle is 8-12mm, and the interval is 50-150mm; the height of the strip-shaped gap nozzle is 5-15mm, and the width of the strip-shaped gap nozzle is the same as that of the front box body plate.
3. The ash deposit prevention wall-attached wind box according to claim 1, wherein: v-shaped included angle of flow equalizing devicer110-150 degrees.
4. An ash deposition preventing wall-mounted wind box according to claim 3, wherein: the center height of the flow equalization device is identical with that of the air inlet of the air box, and the V-shaped bottom edge of the flow equalization deviceLThe length of the flow equalizing device is 1.2-1.8 times of the width of the air inlet of the air box, and the thickness of the flow equalizing device is 1.2-1.8 times of the height of the air inlet of the air box.
5. An ash deposit prevention wall-attached wind box according to any one of claims 1 to 4, characterized in that: the air inlet of the bellows is provided with an electric regulating valve.
6. The ash deposition preventing wall-attached wind box according to claim 5, wherein: a flowmeter is arranged outside the valve of the air inlet of the bellows.
7. An ash deposit prevention wall-attached wind box according to any one of claims 1 to 4, characterized in that: an electromagnetic valve is arranged at the air source inlet of the purging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710347792.3A CN106969348B (en) | 2017-05-17 | 2017-05-17 | Wall-attached wind box capable of preventing dust deposit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710347792.3A CN106969348B (en) | 2017-05-17 | 2017-05-17 | Wall-attached wind box capable of preventing dust deposit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106969348A CN106969348A (en) | 2017-07-21 |
| CN106969348B true CN106969348B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710347792.3A Active CN106969348B (en) | 2017-05-17 | 2017-05-17 | Wall-attached wind box capable of preventing dust deposit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101706110A (en) * | 2009-11-17 | 2010-05-12 | 西安交通大学 | Near-wall air device for preventing high-temperature corrosion of water-cooled wall of power station boiler |
| CN102966959A (en) * | 2012-11-29 | 2013-03-13 | 华南理工大学 | Wall-attached air system for preventing high temperature corrosion of water cooled wall of garbage incinerator |
| CN102961929A (en) * | 2012-11-17 | 2013-03-13 | 江苏康洁环境工程有限公司 | Internal filtering type vibration dust collector with arch breaking device |
| CN102980176A (en) * | 2012-11-29 | 2013-03-20 | 华南理工大学 | Adherence air device for preventing high-temperature corrosion of water cooling wall of refuse burning boiler |
| CN204355702U (en) * | 2014-11-28 | 2015-05-27 | 天瑞集团水泥有限公司 | A kind of powder band conveyor gas cleaning device |
| CN207006125U (en) * | 2017-05-17 | 2018-02-13 | 国电科学技术研究院 | A kind of adherent wind bellows of accumulatingdust |
-
2017
- 2017-05-17 CN CN201710347792.3A patent/CN106969348B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101706110A (en) * | 2009-11-17 | 2010-05-12 | 西安交通大学 | Near-wall air device for preventing high-temperature corrosion of water-cooled wall of power station boiler |
| CN102961929A (en) * | 2012-11-17 | 2013-03-13 | 江苏康洁环境工程有限公司 | Internal filtering type vibration dust collector with arch breaking device |
| CN102966959A (en) * | 2012-11-29 | 2013-03-13 | 华南理工大学 | Wall-attached air system for preventing high temperature corrosion of water cooled wall of garbage incinerator |
| CN102980176A (en) * | 2012-11-29 | 2013-03-20 | 华南理工大学 | Adherence air device for preventing high-temperature corrosion of water cooling wall of refuse burning boiler |
| CN204355702U (en) * | 2014-11-28 | 2015-05-27 | 天瑞集团水泥有限公司 | A kind of powder band conveyor gas cleaning device |
| CN207006125U (en) * | 2017-05-17 | 2018-02-13 | 国电科学技术研究院 | A kind of adherent wind bellows of accumulatingdust |
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| Publication number | Publication date |
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| CN106969348A (en) | 2017-07-21 |
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