CN106195993B - A kind of outlet method of river diversion of tower boiler, mechanism and boiler - Google Patents
A kind of outlet method of river diversion of tower boiler, mechanism and boiler Download PDFInfo
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- CN106195993B CN106195993B CN201610540883.4A CN201610540883A CN106195993B CN 106195993 B CN106195993 B CN 106195993B CN 201610540883 A CN201610540883 A CN 201610540883A CN 106195993 B CN106195993 B CN 106195993B
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- inclined plate
- burner hearth
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- flue
- tower boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles
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Abstract
The invention discloses a kind of outlet method of river diversion of tower boiler, mechanism and boilers, specially：By existing tower boiler front wall close to roof of the furnace and rear wall close to the position of horizontal flue the deviation certain angle into stove, then be connected with horizontal flue, and then form outlet deflector.The mechanism makes the flue gas of upper furnace heat exchanger zones have to pass through steering and could enter horizontal flue, residence time of the flue gas in stove accordingly increases on the left of burner hearth, smoke distribution is also more uniform, to effectively reduce the gas temperature windage of burner hearth left and right side and forward and backward side；Outlet deflector prevents the flue gas of upper furnace heat exchanger zones to the serious deflection of wall after burner hearth simultaneously, reduces abrasion of the ash particle to exchanger tube wall near rear wall in flue gas, is conducive to the safe operation of unit.
Description
Technical field
The invention belongs to Utility Boiler Technology fields, and in particular to a kind of outlet method of river diversion of tower boiler, mechanism and pot
Stove.
Background technology
Process In A Tangential Firing is the most common type of furnace of domestic coal unit, and burner arrangement is in boiler quadrangle, four strands of gas
Stream is sprayed into from outlet in stove, and impact, volume are inhaled mutually, are centrally formed imaginary circle in burner hearth, air-flow is made to be rotated strongly in stove.Cause
And furnace flame degree of filling is preferable, air and coal dust are uniformly mixed, and advantageously form good catch fire and burning condition.Exist simultaneously
Under the tractive force of air-introduced machine, air-flow rises in the shape of a spiral in stove until furnace outlet, extends pulverized coal particle in stove
Residence time is conducive to the after-flame of coal dust.
There are two types of arrangements, i.e. π types arrangement and tower arrangement for Process In A Tangential Firing.π types arrange Process In A Tangential Firing
Flue gas flow channel is in π types, is mainly made of updraught flue, horizontal flue and down pass three parts, and different be heated is respectively arranged
Face.It is equipped with furnace arch, furnace nose at the turning of updraught flue to horizontal flue, to improve flow field when high-temperature flue gas rocket motor so that
Each heat exchanger can be by stronger radiation heat transfer and heat convection.But since the Process In A Tangential Firing flue gas of π types arrangement is upper
Still have strong residual rotation at row flue and horizontal flue, the steering of flue gas is added, so as to cause flue arranged on left and right sides
Flue gas flow field is unevenly distributed, and gas temperature windage is more serious.Larger gas temperature windage can not only cause superheater, reheater tube wall super
Temperature, longtime running, which also results in the phenomenon that booster etc. seriously endangers safe operation of the boiler, to be occurred.With domestic capacity of power unit
Increase and constantly expand, the phenomenon that π type boiler gas temperature windages, is also increasingly severe.Thus many Large-scale machine sets in recent years, especially
It is that 1000MW extra-supercritical units start to gradually adopt tower arrangement.
Each heating surface of tower boiler is arranged in a updraught flue, is connected straight with burner hearth, flue gas enters convection current
There is no the steerings of flue gas when the heating surface of flue arrangement.Tower boiler height is higher, shields the flue-gas temperature at bottom and to be generally less than
The π type boilers of equivalent capability, thus the slagging risk of heating surface is reduced to a certain extent.On the other hand, since flue gas is passing through
It is not turned to when crossing heating surface, would not also generate secondary vortices, while the Multi-layer exchanging heat device arranged in updraught flue can also be cut significantly
Spin intensity of the weak flue gas in uphill process so that flue gas is uniform in the area distribution, and heating surface is heated also more uniform, energy
Effectively reduce gas temperature windage.
But since the outlet of tower boiler burner hearth is in the sides Hou Qiang, i.e., chamber structure is asymmetric, and exhaust pass area is smaller,
Under the action of air-introduced machine tractive force, the flue gases of upper furnace heat exchanger zones can wall deflection backward, lead to upper furnace heat exchanger flue gas
It is unevenly distributed, gas temperature windage occurs so as to cause burner hearth front and rear sides, on the other hand, since flue gas rotates clockwise in stove,
Flue gas on the left of upper furnace heat exchanger can be directly entered horizontal flue, the flue gas on right side then can due to residual rotation and first to
Burner hearth front wall moves, and enters back into horizontal flue, the gas residence time of such upper furnace heat exchanger zones left and right sides is different, heat release
Amount also can be different, and eventually gas temperature windage occurs in arranged on left and right sides.Tube Sheet of Heat Exchanger near wall after the deflection of flue gas can also aggravate simultaneously
The abrasion of wall is unfavorable for the safe operation of unit.
Invention content
The shortcomings that for existing tower boiler, a kind of tower boiler outlet method of river diversion of present invention offer, mechanism and boiler,
It is intended that upper furnace heat exchanger zones flue gas is made to have to pass through steering, without directly from the side close to rear wall it is direct
Into horizontal flue, smoke distribution can more uniformly, and residence time of the burner hearth arranged on left and right sides flue gas in stove is also more nearly,
So as to substantially reduce the gas temperature windage of upper furnace heat exchanger zones left and right side and forward and backward side, heat exchanger is heated more
It is even.Flue gas wall deflection backward can be prevented simultaneously, reduces abrasion of the ash particle to exchanger tube wall near rear wall in flue gas, favorably
In the safe operation of unit.
A kind of tower boiler outlet method of river diversion, in tower boiler burner hearth front wall, wall is close after roof of the furnace and burner hearth
The position of horizontal flue deviation certain angle into stove forms outlet deflector so that the flue gas of upper furnace heat exchanger zones
Horizontal flue could be entered after deflector turns to.
A kind of tower boiler outlet deflector for realizing the method, which is characterized in that the tower boiler outlet guide
Flow mechanism include two parts, be separately positioned on tower boiler burner hearth front wall after roof of the furnace and burner hearth wall close to horizontal flue
Position；Wherein, first part is the inclined plate for connecting burner hearth front wall, second part be after connecting burner hearth the level board of wall with it is oblique
Plate, the front wall and inclined plate, the rear angle between wall and inclined plate, level board and inclined plate are 40 °~50 °.
Further, the angle between the front wall and inclined plate, rear wall and inclined plate, level board and inclined plate is 45 °.
A kind of tower boiler reducing gas temperature windage, including furnace body, the level that is connected to positioned at furnace body upper end and with furnace body
Flue and the down pass being connected with horizontal flue, the furnace body include the dry bottom hopper installed successively from lower to upper, main combustion
Area and upper furnace heat exchanger zones, tower boiler burner hearth front wall after roof of the furnace and burner hearth wall close to the position of horizontal flue
Outlet deflector is installed, the flue gas of the upper furnace heat exchanger zones could enter water after outlet deflector turns to
Flat flue.
Deflector makes upper furnace heat exchanger zones flue gas have to pass through steering, burner hearth left side before entering horizontal flue
Residence time of the flue gas in stove accordingly increase, thermal discharge accordingly increases, reduce and burner hearth on the right side of flue gas thermal discharge
Gap.Air-flow wall deflection backward is simultaneously effective prevented, flue gas is also more uniform in the distribution of upper furnace heat exchanger, and such one
Aspect can substantially reduce the gas temperature windage of upper furnace heat exchanger zones so that heat exchanger is uniformly heated, on the other hand
The abrasion for reducing ash particle heat exchanging device tube wall in flue gas, is conducive to the safe operation of unit.
Compared with prior art, the present invention its advantageous effects is embodied in：
(1) compared to existing tower boiler, after arrangement outlet deflector, flue gas enter before horizontal flue have to through
Steering is crossed, to increase residence time of the flue gas on the left of burner hearth in stove, radiator also accordingly increases, and reduces and the right side
The gap of side flue gas thermal discharge, effectively improves the gas temperature windage of upper furnace heat exchanger zones arranged on left and right sides.
(2) since flue gas has to pass through steering, without being directly entered horizontal flue, thus cigarette from the side close to rear wall
Gas is more uniform in the distribution of upper furnace heat exchanger zones, effectively reduces the gas temperature windage of front and rear sides.
(3) outlet deflector prevents flue gas wall deflection backward, compared to existing tower boiler, can substantially reduce
Abrasion of the ash particle to exchanger tube wall near rear wall, is conducive to the safe operation of unit in flue gas.
Description of the drawings
Fig. 1 is existing tower boiler construction；
Fig. 2 (a) is the tower boiler construction figure for arranging outlet deflector, and Fig. 2 (b) is outlet water conservancy diversion mechanism structure
Figure.
Specific implementation mode
Below in conjunction with attached drawing, the present invention will be described in further detail.It should be appreciated that specific implementation described herein
Example is only used to explain the present invention, is not intended to limit the present invention.In addition, in the various embodiments of the present invention described below
Involved technical characteristic can be combined with each other as long as they do not conflict with each other.
Illustrate that existing tower boiler and a kind of tower boiler export deflector in conjunction with Fig. 1, Fig. 2.Tower boiler includes
Dry bottom hopper 1, primary zone 2, upper furnace heat exchanger zones 3, horizontal flue 4 and down pass 5.Primary zone uses low NOxCoaxial combustion
Burning system (LNCFS), be equipped with 12 layers totally 48 reinforcings catch fire (EI) coal nozzle.Upper furnace heat exchanger zones are from the bottom to top
It has been respectively arranged primary superheater 3-1, three-stagesuperheater 3-2, two level reheater 3-3, two-stage superheater 3-4, level-one reheater
3-5 and economizer 3-6.Horizontal flue is connected above economizer with down pass, and length is shorter, and flow area is that burner hearth is transversal
The 30% of face area.
The existing tower boiler horizontal flues of Fig. 1 and burner hearth angle are about 90 °.A kind of tower boiler outlet shown in Fig. 2
Deflector, it is characterized in that tower boiler front wall is inclined into stove close to the position of horizontal flue close to roof of the furnace and rear wall
Folding, then be connected with horizontal flue, and then form outlet deflector 6.Since angle is identical between the device and horizontal flue, because
And furnace height does not increase too much.Outlet deflector 6 better embodiment be：Including two parts, it is separately positioned on tower
Formula boiler furnace front wall after roof of the furnace and burner hearth wall close to the position of horizontal flue；Wherein, first part is connection stove
The inclined plate of thorax front wall, second part are the level board and inclined plate of wall after connecting burner hearth, the front wall and inclined plate, the Hou Qiang with tiltedly
Angle between plate, level board and inclined plate is 40 °~50 °, preferably 45 °.
Flue gas rotates in stove clockwise in existing tower boiler operation, thus the cigarette on the left of upper furnace heat exchanger
Gas can be directly entered horizontal flue, and the flue gas on right side can then be moved due to residual rotation and first to burner hearth front wall, and level is entered back into
Flue, the gas residence time on the left of such burner hearth upper furnace heat exchanger will be less than the flue gas on right side, and thermal discharge can also reduce,
For corresponding flue-gas temperature with regard to higher, there is gas temperature windage in final arranged on left and right sides；Simultaneously because burner hearth front and rear sides structure is not
Symmetrically, and horizontal flue and down pass flow area are smaller, thus upper furnace heat exchanger zones flue gas can leading because of air-introduced machine
Gravitation can the serious deflection of wall backward, cause smoke distribution uneven, thus the forward and backward side of boiler also will appear gas temperature windage.Smoke temperature is inclined
Difference can cause heat exchanger uneven heating, longtime running that can then lead to heat exchanger overtemperature.The generation of phenomena such as booster.In addition, existing
Under tower boiler the movement of particle also can wall deflection backward, since flue gas flow rate is very fast near rear wall, a large amount of ash particles wall backward
Deflection can cause the tube wall of heat exchanger near rear wall to be seriously worn, and substantially reduce the service life of heat exchanger.
Increase export after deflector, left side flue gas can pass through before entering horizontal flue to be turned to, to increase its
Residence time in stove increases the thermal discharge between flue gas and heat exchanger, thus the gas temperature windage of arranged on left and right sides obtains
Significant to improve, on the other hand, the flue gas of upper furnace heat exchanger will not be directly entered horizontal flue from close to this side of rear wall,
But to pass through to turn to could enter horizontal flue, to effectively prevent flue gas wall deflection backward, reduce forward and backward side
Gas temperature windage, while the abrasion of ash particle heat exchanging device tube wall in flue gas can also be greatly reduced.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of tower boiler exports method of river diversion, which is characterized in that in tower boiler burner hearth front wall close to roof of the furnace and stove
Close to the position of horizontal flue, the deviation certain angle into stove forms outlet deflector to wall after thorax so that upper furnace heat exchanger
The flue gas in region could enter horizontal flue after deflector turns to.
2. a kind of tower boiler outlet deflector for realizing claim 1 the method, which is characterized in that the tower boiler
Export deflector include two parts, be separately positioned on tower boiler burner hearth front wall after roof of the furnace and burner hearth wall close to water
The position of flat flue；Wherein, first part is the inclined plate for connecting burner hearth front wall, and second part is the level board of wall after connecting burner hearth
With inclined plate, the front wall and inclined plate, the rear angle between wall and inclined plate, level board and inclined plate are 40 °~50 °.
3. a kind of tower boiler outlet deflector for realizing claim 2 the method, which is characterized in that the upper furnace changes
Angle between the front wall and inclined plate in hot device region, the rear wall and inclined plate, level board and inclined plate of upper furnace heat exchanger zones is
45°。
4. a kind of tower boiler reducing gas temperature windage, including furnace body, the horizontal cigarette that is connected to positioned at furnace body upper end and with furnace body
Road and the down pass being connected with horizontal flue, the furnace body include the dry bottom hopper installed successively from lower to upper, primary zone
With upper furnace heat exchanger zones, which is characterized in that tower boiler burner hearth front wall after roof of the furnace and burner hearth wall close to water
The position of flat flue is equipped with outlet deflector, and the flue gas of the upper furnace heat exchanger zones is after outlet deflector turns to
Horizontal flue could be entered.
5. a kind of tower boiler reducing gas temperature windage according to claim 4, which is characterized in that the tower boiler
Export deflector include two parts, be separately positioned on tower boiler burner hearth front wall after roof of the furnace and burner hearth wall close to water
The position of flat flue；Wherein, first part is the inclined plate for connecting burner hearth front wall, and second part is the level board of wall after connecting burner hearth
With inclined plate, the front wall and inclined plate, the rear angle between wall and inclined plate, level board and inclined plate are 40 °~50 °.
6. a kind of tower boiler reducing gas temperature windage according to claim 5, which is characterized in that the upper furnace changes
Angle between the front wall and inclined plate in hot device region, the rear wall and inclined plate, level board and inclined plate of upper furnace heat exchanger zones is
45°。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610540883.4A CN106195993B (en) | 2016-07-11 | 2016-07-11 | A kind of outlet method of river diversion of tower boiler, mechanism and boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610540883.4A CN106195993B (en) | 2016-07-11 | 2016-07-11 | A kind of outlet method of river diversion of tower boiler, mechanism and boiler |
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| CN106195993A CN106195993A (en) | 2016-12-07 |
| CN106195993B true CN106195993B (en) | 2018-09-07 |
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| CN109668625B (en) * | 2018-12-21 | 2020-04-21 | 浙江大学 | Boiler slag falling monitoring and controlling method based on cold ash hopper vibration signal |
| CN109579552B (en) * | 2018-12-26 | 2024-04-09 | 苏州海陆重工股份有限公司 | Transition flue of waste heat boiler of smelting furnace |
| CN110131700A (en) * | 2019-06-20 | 2019-08-16 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | A kind of asymmetric blaze-folding corner structure reducing boiler gas temperature windage |
| CN110779026A (en) * | 2019-11-08 | 2020-02-11 | 哈尔滨锅炉厂有限责任公司 | Rubbish exhaust-heat boiler optimizes flue gas flow field structure |
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| KR100444497B1 (en) * | 1997-05-09 | 2004-08-16 | 지멘스 악티엔게젤샤프트 | Continuous steam generator |
| CN102889570B (en) * | 2012-09-11 | 2014-11-12 | 上海锅炉厂有限公司 | Tower-type boiler with primary reheater and secondary reheater |
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