CN107806633A - CFB boiler air film Wear-proof water cooled wall structure - Google Patents
CFB boiler air film Wear-proof water cooled wall structure Download PDFInfo
- Publication number
- CN107806633A CN107806633A CN201610812570.XA CN201610812570A CN107806633A CN 107806633 A CN107806633 A CN 107806633A CN 201610812570 A CN201610812570 A CN 201610812570A CN 107806633 A CN107806633 A CN 107806633A
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- wind chamber
- water
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- wind
- cooling wall
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Classifications
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- 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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- 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
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
Abstract
The present invention is a kind of CFB boiler air film Wear-proof water cooled wall structure, water-cooling wall is provided with CFB boiler, it is made up of the fin between pipeline and pipeline, at least one is set to chamber group of drying to fiery side in water-cooling wall, every group comprising upper, lower 2 layers of wind chamber, therebetween two-way wind chamber also can be set, on, the air outlet of lower floor's wind chamber and two-way wind chamber is oppositely arranged to be formed to blowing film, also comprising logical air feed branch pipe and air feed main pipe on water-cooling wall fin, the present invention to be formed air film and prevent abrasion of the gas-solid two-phase flow to water-cooling wall by two-way to blowing, extend the service life of water-cooling wall, the trouble frequently repaired and change water-cooling wall is also saved while reaching abrasionproof effect, reduce and spend cost.
Description
Technical field
The invention belongs to CFB boiler air film Wear-proof water cooled wall structure, belong to field of dynamic engineering.
Background technology
CFB（circulating fluidized bed）CFBB, because it has, fuel tolerance is wide, fires
Burn that efficiency high, Load Regulation ability are strong, direct desulfurization and can realize that low NOx drainage, fuel preparation system are simple in bed, are easy to
The many merits such as ash comprehensive utilization are realized, are widely adopted in power engineering.
Though CFB boiler, which compares other type of furnaces, many merits as described above, its existing inadequate natural endowment --- in stove by
Abrasion of the hot face under the effect of gas-solid two-phase flow, the transition region waterwall tube cracking being particularly between emulsion zone and dilute-phase zone are asked
Topic, the reliability of boiler operatiopn is had a strong impact on, early stage boiler is and famous with " week stove " because continuous operating time is short.
Central gas stream moves upwards in CFB boiler burner hearth, and surrounding sticking wall flow flows downward, contained solid in sticking wall flow
Grain, after the beginning that flows downward, by Action of Gravity Field, flow velocity is cumulative, and water-cooling wall is caused to wear.It can be seen that waterwall tube cracking is due to
In stove caused by gas-solid bidirectional flow operation mechanism.
According to long-term observation and summary, the rate of depreciation on ash to heating surface, the understanding of general regularity is formd,
I.e. rate of depreciation is relevant with ash concentration, grey granularity and grey speed, with ash concentration, grey granularity square and grey speed cube into just
Than.
The wear problem for solving heating surface at present is also exactly to set about from this several respect.Such as by the pot for using gangue design entirely
Stove, which is only partly mixed burning or abandoned, burns spoil to reduce ash concentration；Along water-cooling wall short transverse, multilayer abrasionproof dividing plate or abrasionproof beam are set,
Wish to reduce adherent ash concentration and flow velocity by dividing plate or abrasionproof beam.
Made moderate progress using waterwall tube cracking effect after above-mentioned measure, as certain power plant 240t/h CFB boilers use abrasionproof beam
（Effect is better than abrasionproof dividing plate）After technology, the continuous cycle of operation extended to 8 ~ 10 months from 3 ~ 4 months.
The Precautionary Measure used in addition is high temperature or the surface spraying of other forms, to improve boiler heating surface wear resistence,
This method is costly, also fails to solve the problems, such as waterwall tube cracking at all.
The existing mode also having using air film isolation, but because air-flow is inevitable after water screen tube point, by tangent line
Burner hearth is flowed to, water screen tube is most easily ground region and is not only generated without film, two-way vortex can be formed on the contrary, the vortical pressure is relatively
It is low, soot particle can be sucked, so as to form wind wheel, cause the serious problems of directly cutting water-cooling wall.
The content of the invention
Technical problem solved by the invention is prevented in a kind of CFB boiler air film that can effectively prevent waterwall tube cracking of offer
Grind water wall structure.
The technology used in the present invention means are as follows.
A kind of CFB boiler air film Wear-proof water cooled wall structure, be provided with CFB boiler water screen tube and adjacent water screen tube it
Between water-cooling wall fin, water-cooling wall to fiery side set at least one to dry chamber group, every group includes upper and lower 2 layers of wind chamber, upper and lower
The air outlet of layer wind chamber is oppositely arranged, and also comprising air feed branch pipe, its one end is logical to be located at corresponding to wind chamber on water-cooling wall fin, another
End connection air feed main pipe.
The upper strata wind chamber includes wind chamber side plate and the wind chamber top plate for closing upper strata Feng Qiang tops, the upper strata wind
The bottom of the wind chamber side plate of chamber is in the contraction-like of water-cooling wall direction, and air-out under arc is formed between its bottom and water-cooling wall
Mouthful；Lower floor's wind chamber includes wind chamber side plate and the wind bottom of chamber plate for closing lower floor's wind chamber bottom, the wind chamber of lower floor's wind chamber
The top of side plate is in the contraction-like of water-cooling wall direction, and air outlet on arc is formed between its upper end and water-cooling wall.
Wind chamber top plate and wind bottom of chamber plate are welded in water-cooling wall and water-cooling wall fin, the bottom of the wind chamber side plate of upper strata wind chamber with
It is tack-weld between water-cooling wall fin, between the upper end of the wind chamber side plate of lower floor's wind chamber and water-cooling wall fin, at spot welding
Side exports for fin wind film.
The two-way wind chamber of at least one can be provided between the fin not upper and lower layer wind chamber of abrading section, the two-way wind chamber includes
Wind chamber side plate, its upper and lower part are in the shape between the upper and lower end of wind chamber side plate and water-cooling wall to the contraction-like of water-cooling wall direction
Air outlet, the upper and lower end of wind chamber side plate are welded and fixed with water-cooling wall fin under air outlet and arc on camber, the arc
Air outlet is relative with air outlet under the arc of upper strata wind chamber in shape, air outlet and air outlet phase on the arc of lower floor wind chamber under arc
It is right, lead to the one end for setting air feed branch pipe, the other end connection air feed main pipe of air feed branch pipe corresponding to two-way wind chamber on water-cooling wall fin.
The air feed main pipe horizontal annular or single hop are set, and air feed main pipe is fixed by type steel support.
The wind chamber is set along water-cooling wall ring week, or is arranged at intervals.
Described pair of blowing chamber group can single group setting up and down or multigroup.
The air feed branch pipe of the upper and lower layer wind chamber is arranged at the close wind chamber top plate or wind bottom of chamber Ban Chu of water-cooling wall fin,
The air feed branch pipe of the two-way wind chamber is arranged at the position corresponded on water-cooling wall fin among wind chamber side plate.
The wind chamber is metal wind chamber, and wind chamber applies high-temperature wearable protective layer to fiery side.
The present invention also includes air film air feed system, and it includes main air duct, and it is pre- to set gradually primary air fan, air on main air duct
Hot device, total hot blast adjust valve, check-valves, main air duct shut-off valve, automatic temperature-control electric heater；Before the entrance of air preheater, always
Hot blast is parallel with cold wind circuit after adjusting valve outlet, and it sets gradually cold wind shut-off valve and cold wind adjusts valve；The entrance of check-valves it
Before, total hot blast be parallel with supercharged circuit after adjusting valve outlet, it sets gradually supercharging air inlet duct shut-off valve, booster fan and supercharging
Exhaust passage shut-off valve；After the outlet of automatic temperature-control electric heater, main air duct is divided into some branch's wind for leading to each layer air feed main pipe
Road, air feed is equipped with each branch air channel and adjusts valve and flowmeter.
Had the beneficial effect that caused by the present invention.
1st, CFB boiler using the present invention air film abrasion-proof structure, with it is two-way to film-blowing type wind formed air film mode, in ash
Gas-insulated layer is formed between particle and water-cooling wall metal wall, air film all standing is formed in fire surface setting regions, makes particle
The chance of pipe outer wall is not in contact with, reaches and thoroughly protects tube wall from the purpose of abrasion, effectively extends the service life of water-cooling wall,
It is set to fully achieve the degree to be compared favourably with coal-powder boiler.
2nd, in annular water-cooling wall to fiery side position（Settable windbreak, forced draft turn to）, the wind after blowing is turned
To burner hearth center, direction will not stably cause eddy flow, and running is safe and effective.
3rd, structure of the present invention and uncomplicated, cost and operating cost bottom, can also be saved while reaching abrasionproof effect frequently
The trouble for changing water-cooling wall is repaired, reduces and spends cost.
Brief description of the drawings
Fig. 1 is the structural representation of embodiments of the invention 1.
Fig. 2 is the horizontal cross-section schematic diagram of embodiments of the invention 1.
Fig. 3 a are the structure for amplifying longitudinal cross-section schematic diagram of upper strata wind chamber.
Fig. 3 b are the structure for amplifying longitudinal cross-section schematic diagram of lower floor's wind chamber.
Fig. 4 is the structural representation of embodiments of the invention 3.
Fig. 5 is the horizontal cross-section schematic diagram of two-way wind chamber.
The structure for amplifying side schematic view of the two-way wind chambers of Fig. 6.
Fig. 7 is the connection relationship diagram of air film air feed system.
Embodiment
A kind of CFB boiler air film Wear-proof water cooled wall structure having to chamber of drying of present invention protection.
Fin panel casing is provided with CFB boiler, it includes the water between plural water screen tube 11 and adjacent water screen tube
Cold wall fin 12, fin panel casing to fiery side set at least one to dry chamber group, every group includes upper and lower 2 layers of wind chamber 21,22,
Wind chamber can be set along the ring of water-cooling wall 1 week, or be arranged at intervals, and be designed according to the boiler demand of reality.
With reference to shown in Fig. 1 to Fig. 3, upper strata wind chamber 21 includes wind chamber side plate 213 and for closing upper strata Feng Qiang21 tops
Wind chamber top plate 212, the bottom of above-mentioned wind chamber side plate 213 is in the contraction-like of water-cooling wall direction, the bottom of wind chamber side plate 213
Form air outlet 211 under arc between 214 and water screen tube 11, the bottom 214 of wind chamber side plate 213 and water-cooling wall fin 12 it
Between can be connected by way of tack-weld, at spot welding side for fin wind film export.
Lower floor's wind chamber 22 includes wind chamber side plate 223 and the wind bottom of chamber plate 222 for closing the bottom of lower floor's wind chamber 22, above-mentioned
The top of wind chamber side plate 223 is in the shape between the upper end 224 of wind chamber side plate 223 and water-cooling wall to the contraction-like of water-cooling wall direction
Air outlet 221 on camber, can be by way of tack-weld between the upper end 224 of wind chamber side plate 223 and water-cooling wall fin 12
It is connected, side is fin wind film outlet 225 at spot welding.
221 corresponding setting of air outlet on air outlet 211 and arc under above-mentioned arc, make the membrane type of two arc air outlets
Wind is formed to entering burner hearth after blowing, i.e., forms air film to fiery side in water-cooling wall, prevent the abrasion of water-cooling wall.Wind chamber uses metal material
Matter is made, and is optimal by welded steel plate.High-temperature wearable protective layer 10 is applied outside metal wind chamber, it selects existing high-temperature wearable material
Matter.
Above-mentioned wind chamber top plate 212 and wind bottom of chamber plate 222 edge is all welded on water screen tube 11 and water-cooling wall fin 12,
Ensure the function of the upper and lower unidirectional air-out of layer wind chamber.Bottom 214 and upper end 224 respectively with relative water-cooling wall fin 12
Line tack-weld.
Said structure also includes the air feed branch pipe 3 of aweather intracavitary air feed, the logical water-cooling wall fin located at wind intracavitary of its one end
On 12, other end connection air feed main pipe 4.Every layer of wind chamber is correspondingly arranged the air feed main pipe 4 that 1 horizontal annular is set, and it can lead to
The support of shaped steel 5 is crossed to fix.
According to the different abrasionproof needs of boiler, above-mentioned 2 groups or multigroup up and down settable to blowing chamber group.Or it can also enter one
Step is provided with the two-way wind chamber 23 of at least one between upper and lower layer wind chamber.
Two-way wind chamber 23 includes wind chamber side plate 233, likewise, its upper and lower part is in contraction-like, the wind to water-cooling wall direction
Air outlet 232, wind chamber under air outlet 231 and arc are formed on arc between the upper and lower end of chamber side plate 233 and water screen tube 11
The upper and lower end 234 of side plate 233 is welded and fixed with water-cooling wall fin 12, air outlet 231 and upper strata wind chamber 21 on the arc
Arc under air outlet 211 it is relative, air outlet 232 is relative with air outlet 221 on the arc of lower floor's wind chamber 22 under arc, two-way wind
Lead to the one end for setting air feed branch pipe 3 corresponding to chamber 23 on water-cooling wall fin, the other end connection air feed main pipe 4 of air feed branch pipe 3, its is same
Sample can be supported by shaped steel 5 and fixed.
The air feed branch pipe of upper and lower layer wind chamber is arranged at close wind chamber top plate or wind bottom of chamber Ban Chu on water-cooling wall fin 12,
And the air feed branch pipe of two-way wind chamber is arranged at water-cooling wall fin and corresponds to position among wind chamber side plate, so that upper and lower air quantity is uniform
Distribution.
The air feed main pipe 4 of above layers is also connected with air film air feed system.As illustrated, it includes main air duct, on main air duct
Set gradually primary air fan 61, air preheater 62, total hot blast and adjust valve 63, check-valves 64, main air duct shut-off valve 65, automatic temperature-control
Electric heater 66, i.e., provide First air by primary air fan 61 and form abrasionproof air film.Before the entrance of air preheater 62, total heat
Wind is parallel with cold wind circuit after adjusting the outlet of valve 63, and it sets gradually cold wind shut-off valve 71 and cold wind adjusts valve 72, and it is used to control
Regulation passes through the temperature of First air after preheater.Before the entrance of check-valves 64, total hot blast adjust valve 63 outlet after be parallel with increasing
Line ball road, it sets gradually supercharging air inlet duct shut-off valve 73, booster fan 74 and supercharging exhaust passage shut-off valve 75.By foregoing control
After gentle pressurized treatment, main air duct is divided into lead to each air feed main pipe some points after the outlet of automatic temperature-control electric heater 66
Branch air duct, air feed is equipped with each branch air channel and adjusts valve 8 and flowmeter 9.It is water-cooling wall abrasionproof wind by air film air feed system
Chamber provides the First air of preference temperature and enough pressure, ensures the formation to film of drying.
In general, air film Wear-proof water cooled wall structure of the invention can be applied to CFB boiler abrasion condition it is relatively tight
The region such as emulsion zone and transition region of weight.
It is the embodiments different to blowing chamber group and two-way wind chamber below.
Embodiment 1：As shown in figure 1,1 group of annular is set to chamber of drying on fin panel casing.
Embodiment 2：As shown in figure 4,1 group of annular is set to chamber of drying, to being provided with 1 between blowing chamber on fin panel casing
The two-way wind chamber of annular.
2 embodiments are only enumerated above, but are not limited thereto, and, every layer set-up mode different from above-mentioned wind chamber group number is not
Together, but wind cavity configuration identical is within protection scope of the present invention.
Claims (10)
- Be provided with 1. a kind of CFB boiler air film Wear-proof water cooled wall structure, in CFB boiler water screen tube 11 and adjacent water screen tube it Between water-cooling wall fin（12）, it is characterised in that water-cooling wall to fiery side set at least one to dry chamber group, every group comprising it is upper, Lower 2 layers of wind chamber（21、22）, the air outlet of upper and lower layer wind chamber（211、221）It is oppositely arranged, also comprising air feed branch pipe（3）, one End is logical to be located at water-cooling wall fin corresponding to wind chamber（12）On, other end connection air feed main pipe（4）.
- 2. CFB boiler air film Wear-proof water cooled wall structure as claimed in claim 1, it is characterised in that：The upper strata wind chamber（21）Include wind chamber side plate（213）And for closing upper strata wind chamber（21）The wind chamber top plate on top （212）, the wind chamber side plate（213）Bottom be in the contraction-like of water-cooling wall direction, wind chamber side plate（213）Bottom and water cooling Air outlet under arc is formed between wall（211）；Lower floor's wind chamber（22）Include wind chamber side plate（223）And for closing lower floor's wind chamber（22）The wind bottom of chamber plate of bottom （222）, above-mentioned wind chamber side plate（223）Top be in the contraction-like of water-cooling wall direction, wind chamber side plate（223）Upper end and water cooling Air outlet on arc is formed between wall（221）.
- 3. CFB boiler air film Wear-proof water cooled wall structure as claimed in claim 2, it is characterised in that wind chamber top plate（212）And wind Bottom of chamber plate（222）It is welded in water screen tube（11）And water-cooling wall fin（12）, wind chamber side plate（213）Bottom（214）With water cooling Wall fin（12）Between, wind chamber side plate（223）Upper end（224）With water-cooling wall fin（12）Between be tack-weld, point Side exports for fin wind film at weldering.
- 4. CFB boiler air film Wear-proof water cooled wall structure as claimed in claim 2, it is characterised in that between upper and lower layer wind chamber Provided with the two-way wind chamber of at least one（23）, the two-way wind chamber（23）Include wind chamber side plate（233）, its upper and lower part is in water-cooling wall Contraction-like, the wind chamber side plate in direction（233）Upper and lower end and water screen tube（11）Between formed arc on air outlet（231） With air outlet under arc（232）, wind chamber side plate（233）Upper and lower end with water-cooling wall fin（12）It is welded and fixed, the arc Air outlet in shape（231）With upper strata wind chamber（21）Arc under air outlet（211）Relatively, air outlet under arc（232）With lower floor Wind chamber（22）Arc on air outlet（221）Relatively, two-way wind chamber（23）Lead on corresponding water-cooling wall fin and set air feed branch pipe One end, the other end connection air feed main pipe of air feed branch pipe（4）.
- 5. the CFB boiler air film Wear-proof water cooled wall structure as described in Claims 1-4 is any, it is characterised in that the air feed is female Pipe（4）Horizontal annular is set, and air feed main pipe（4）Pass through shaped steel（5）Support is fixed.
- 6. the CFB boiler air film Wear-proof water cooled wall structure as described in Claims 1-4 is any, it is characterised in that the wind chamber edge Water-cooling wall（1）Ring week is set, or is arranged at intervals.
- 7. the CFB boiler air film Wear-proof water cooled wall structure as described in Claims 1-4 is any, it is characterised in that described pair of blowing Chamber group can be 2 groups setting up and down or multigroup.
- 8. CFB boiler air film Wear-proof water cooled wall structure as claimed in claim 4, it is characterised in that the upper and lower layer wind chamber Air feed branch pipe is arranged at water-cooling wall fin（12）Close wind chamber top plate or wind bottom of chamber Ban Chu, the air feed branch pipe of the two-way wind chamber It is arranged at and position among wind chamber side plate is corresponded on water-cooling wall fin.
- 9. the CFB boiler air film Wear-proof water cooled wall structure as described in Claims 1-4 is any, it is characterised in that the wind chamber is Metal wind chamber, wind chamber apply high-temperature wearable protective layer to fiery side.
- 10. the CFB boiler air film Wear-proof water cooled wall structure as described in Claims 1-4 is any, it is characterised in that also comprising gas Film air feed system, it includes main air duct, primary air fan is set gradually on main air duct（61）, air preheater（62）, total hot blast adjusts Valve（63）, check-valves（64）, main air duct shut-off valve（65）, automatic temperature-control electric heater（66）；Air preheater（62）Entrance before, total hot blast adjust valve（63）Cold wind circuit is parallel with after outlet, it sets gradually Cold wind shut-off valve（71）Valve is adjusted with cold wind（72）；Check-valves（64）Entrance before, total hot blast adjust valve（63）Supercharged circuit is parallel with after outlet, it sets gradually supercharging Air inlet duct shut-off valve（73）, booster fan（74）With supercharging exhaust passage shut-off valve（75）；Automatic temperature-control electric heater（66）After outlet, main air duct is divided into some branch air channels for leading to each layer air feed main pipe, often Air feed is equipped with individual branch air channel and adjusts valve（8）And flowmeter（9）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812570.XA CN107806633A (en) | 2016-09-09 | 2016-09-09 | CFB boiler air film Wear-proof water cooled wall structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812570.XA CN107806633A (en) | 2016-09-09 | 2016-09-09 | CFB boiler air film Wear-proof water cooled wall structure |
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| Publication Number | Publication Date |
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| CN107806633A true CN107806633A (en) | 2018-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610812570.XA Pending CN107806633A (en) | 2016-09-09 | 2016-09-09 | CFB boiler air film Wear-proof water cooled wall structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060801A (en) * | 2021-11-05 | 2022-02-18 | 国家能源集团内蒙古电力有限公司 | Method and device for preventing heated surface in furnace of circulating fluidized bed boiler from being abraded |
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| CN206037020U (en) * | 2016-09-09 | 2017-03-22 | 中国电力工程顾问集团华北电力设计院有限公司 | CFB boiler air film abrasionproof water -cooling wall structure |
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Patent Citations (6)
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| CH699406A2 (en) * | 2008-08-26 | 2010-02-26 | Mokesys Ag | Ventilated refractory wall, in particular for an incinerator. |
| CN102721043A (en) * | 2012-07-10 | 2012-10-10 | 烟台龙源电力技术股份有限公司 | Pulverized coal fired boiler with wall-attachment secondary air and grid burning-out air |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114060801A (en) * | 2021-11-05 | 2022-02-18 | 国家能源集团内蒙古电力有限公司 | Method and device for preventing heated surface in furnace of circulating fluidized bed boiler from being abraded |
| CN114060801B (en) * | 2021-11-05 | 2023-09-29 | 国家能源集团内蒙古电力有限公司 | Method and device for preventing abrasion of heating surface in circulating fluidized bed boiler |
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