CN205535720U - Circulating fluidized bed furnace of area extension water -cooling wall - Google Patents
Circulating fluidized bed furnace of area extension water -cooling wall Download PDFInfo
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- CN205535720U CN205535720U CN201620277543.2U CN201620277543U CN205535720U CN 205535720 U CN205535720 U CN 205535720U CN 201620277543 U CN201620277543 U CN 201620277543U CN 205535720 U CN205535720 U CN 205535720U
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- cooling wall
- extension water
- water
- burner hearth
- wall
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Abstract
The utility model discloses a circulating fluidized bed furnace of area extension water -cooling wall, including boiler furnace and extension water -cooling wall, furnace's upper portion is equipped with furnace and exports, the extension water -cooling wall links to each other with furnace's inner wall, can avoid expanding the vibrations that the water -cooling wall probably arouses. The width of extension water -cooling wall is less than or equal to 1 meter, and the heat transfer area of extension water -cooling wall is corresponding with furnace's inner wall lateral area. The utility model discloses an increase the extension water -cooling wall: 1. Increase CFB boiler furnace's heat transfer area, play and reduce and the balanced effect of furnace temperature down, 2. Make the bed temperature more even, reduce the original volume of giving birth to of NOx, play promoting effect to realizing that ultralow NOx discharges, 3. The material granule flows with the flue gas in the extension water -cooling wall guide furnace, even flow field with prevent that the side direction from wearing and tearing, application scope is wide for this extension water -cooling wall, can use in various CFB boilers, especially large capacity CFB boiler and overcritical CFB boiler to and large -scale CFB boiler improvement is used.
Description
Technical field
This utility model relates to a kind of CFBB, particularly relates to the recirculating fluidized bed of a kind of band extension water-cooling wall
Boiler furnace, belongs to circulating fluidized bed technique field.
Background technology
At present, recirculating fluidized bed (CFB) combustion technology is a kind of novel clean coal combustion technology, and it is mainly characterized by fuel
In fluidisation state burning in burner hearth.Fuel is sent into burner hearth by coal feeder, takes burner hearth bottom out of and enter under high pressure First air effect
Row Matter Transfer, participates in burning and heat transfer in cyclic process.Along with maximization, the capacity of CFBB increase, for
Ensure appropriate flue gas fluidizing velocity, the most proportional increase of burner hearth cross-sectional area of boiler.Owing to area of section increase is square
Level increases, and the water-cooling wall area being centered around burner hearth surrounding is linearly increasing, and therefore water-cooling wall area compares boiler capacity increases
Aobvious deficiency.
Not enough in order to make up surrounding water-cooling wall area, had arrange in burner hearth different additional heat exchange area patent and
Document.
If patent publication No. is the Chinese utility model patent of CN101067490A, it discloses a kind of supercritical steam cycle stream
Fluidized bed boiler furnace heating surface, it includes water-cooled distributor and water-cooling wall, it is characterised in that also include that extension screen, extension screen are L
Shape membrane type screen, extends screen bottom and lays high-abrasive material, and extension screen lower header is working medium import header, and it is working medium that upper collecting chamber is shielded in extension
Outlet header；Extension screen is positioned at inside water-cooling wall；Water-cooling wall lower header is working medium import header, and water-cooling wall upper collecting chamber is that working medium goes out
Mouth header, water-cooling wall upper collecting chamber is connected by being connected pipeline with extension screen lower header.This device is ensureing hydrodynamic force safety
Under premise, in burner hearth, add screen formula extended surface, reduce water wall surface and amass, make supercritical circulating fluidized bed pot
Stove size of burner hearth can be the least, particularly can reduce furnace height, thus reduce boiler cost and manufacture difficulty.
But the cascaded structure that water-cooling wall upper collecting chamber is connected by being connected pipeline with extension screen lower header is to the steam that water-cooling wall exports
Mass dryness fraction has strict demand, and " under boiler 30% load condition, working medium mass dryness fraction wants >=80% " " under boiler 50% load condition, water-cooling wall 2
Working medium is heated to be saturated vapor ".Above-mentioned requirements makes water-cooling wall still must have enough areas so that furnace height reduces
Limited extent.In addition water-cooling wall 2 and extension screen 3 series connection, water screen system mass velocity is the highest, especially the quality of extension screen 3
Flow velocity.The temperature action that mass velocity increases reducing tube wall is limited, but the resistance of water-cooling wall can be made to increase, and increases boiler feedwater
The energy consumption of pump, reduces the economy of power plant.This kind of mode extends shields in the middle and upper part of burner hearth, does not has for Large CFB Boiler
Increase the effect of lower hearth heat exchange area, do not have reduction lower hearth temperature, the purpose of the generation of suppression nitrogen oxides.
If patent publication No. is the Chinese utility model patent of CN1714255A, it discloses a kind of normal pressure using circulation
The continuous steam generator of fluidized bed combustion, it includes a turbulence chamber, and wherein, turbulence chamber is the most comprehensively by bag
Leg restriction and the tube wall being made up of airtight, to utilize perpendicular piping form, and have at least one in bottom
Individual funnel；And turbulence chamber constitute have at least one perpendicular arrange and be provided with vertical piping add hot surface,
Wherein add hot surface to be made up of the pipe contact pin pipe combination of a kind of welding；And surround wall and add the piping of hot surface by water/
Steam working media flows through, and wherein, whole pipe of encirclement wall and heater is configured to carburator and adds hot surface and in order to logical
Flow working media the most to be vaporized and be together in parallel；The whole pipe surrounding wall has smooth inner tube surface, and adds
Hot surface extends between combustor bottom surface or funnel top edge and combustion chamber lid.Described in patent CN1714255A, heating surface can only
It is arranged in the centre position of burner hearth, to meet " identical heated length ".But, the furnace height of circulating fluidized bed boiler is the highest
Reaching 40 ~ 50 meters the highest, heating surface is arranged in the middle of burner hearth, is very easy to cause vibrations, or flexural deformation, is boiler fortune
The potential safety hazard of row.Secondly, heating surface is arranged in the middle of burner hearth and can hinder flow of flue gas in circulating fluidized bed boiler burner hearth, unfavorable pot
Inner flue gas of the stove, material concentration are uniform.Add hot surface and be also difficult to the heated length identical with surrounding wall.
Such as the utility model patent of Publication No. CN101558265A, it discloses a kind of has following of evaporator surface structure
Circulation fluidized bed boiler, it mainly arranges a vaporizer, and vaporizer is mainly made up of two cross-coupled vertical water tube panels.
This vaporizer is that decussate texture is arranged, is not connected with boiler furnace inwall, and its structure is complicated, cross vaporizer volume
Greatly, can hinder flow of flue gas in circulating fluidized bed boiler burner hearth, unfavorable pot inner flue gas of the stove, material concentration are uniform, and flexible arrangement is poor.
The furnace height of circulating fluidized bed boiler is typically up to 40 ~ 50 meters the highest, and cross vaporizer there is also the hidden danger of vibrations.
The method of the additional heat exchange area of above-mentioned difference, in not having or seldom using ciculation fluidized burner hearth, sinking granule is dense
Degree height, the feature that heat exchange is strong, the heat exchange efficiency of the most additional heat exchange area is the lowest.
Utility model content
The purpose of this utility model is: provide the recirculating fluidized bed burner hearth of a kind of band extension water-cooling wall, with prior art
The structure difference of middle increase vaporizer or water-cooling wall is: this extension water wall structure is very simple, owing to being connected with burner hearth,
Therefore can be the most vertically arranged, reduce the difficulty installed, and its set-up mode is flexible, diversified, applied widely, can have
The above-mentioned problems of the prior art of solution of effect.
The purpose of this utility model is to be realized by following technical proposals: the recirculating fluidized bed of a kind of band extension water-cooling wall
Burner hearth, including boiler furnace and extension water-cooling wall, the top of burner hearth is provided with furnace outlet, and described extension water-cooling wall is interior with burner hearth
Wall is connected, it is possible to avoid extending the vibrations that water-cooling wall may cause.The width of extension water-cooling wall, less than or equal to 1 meter, extends water
The heat exchange area of cold wall is corresponding with the inwall lateral area of burner hearth.
As preferably, extension water-cooling wall is vertically arranged, and its width is less than the width declining granular layer.Recirculating fluidized bed burner hearth
In material, the feature of circulation is: at burner hearth center, carrying flue gas, under air-flow drag force effect, granule entirety flows up, i.e.
Flow to ceiling from air distribution plate, near the wall of burner hearth, particle aggregation under gravity, vertical downflow, formed dense
Spend high decline granular layer.In sinking granular layer, the coefficient of heat transfer of extension water-cooling wall is high, and the utilization rate of heat-transfer surface is high.And
And as a rule, the width of sinking granular layer is less than 1 meter, extension water-cooling wall width, will not without departing from declining granular layer
Hinder and affect burner hearth centrophyten and flue gas entirety flows up, therefore extending the position of water-cooling wall flexibly, Ke Yi
Burner hearth wall flexible arrangement.The extension water-cooling wall being vertically arranged can guide and retrain sinking granule vertical downflow, subtracts
Few granule horizontal bias current erosive wear to burner hearth wall.
As preferably, extension water-cooling wall includes water screen tube and junction steel plate, and water screen tube passes through junction steel plate and burner hearth
Inwall be connected.Junction steel plate is slab construction, it is simple to manufactures and installs.
As preferably, the inwall of burner hearth is mainly by being positioned at front face and rear surface, being positioned at the side wall wall of both sides, be positioned at the end
The air distribution plate in portion and be positioned at top ceiling composition, extension water-cooling wall at least with one of front face, rear surface or side wall surface phase
Even.Owing to extension water-cooling wall is connected with at least one inwall, therefore, it can simplify its installation difficulty, and alternative is installed
Higher.
One of it is preferred that, the heat exchange total length of extension water-cooling wall and front face, rear surface and the length of side wall surface
Sum is corresponding.
One of it is preferred that, the top of extension water-cooling wall passes the ceiling of burner hearth, and bottom passes near air distribution plate
Rear surface.
One of it is preferred that, the top of extension water-cooling wall passes the rear surface below furnace outlet, and bottom passes to be leaned on
The rear surface of nearly air distribution plate.
One of it is preferred that, the top of extension water-cooling wall passes ceiling, and bottom passes the middle part of rear surface.
One of it is preferred that, furnace outlet is arranged on rear surface, and extension water-cooling wall is connected with rear surface, and extension
Water-cooling wall is located at outside the extended line of furnace outlet inclined wall, and preventing extending water-cooling wall affects flue gas flow direction furnace outlet.
Compared with prior art, the beneficial effects of the utility model: this utility model boiler hearth of circulating fluidized bed passes through
Increase extension water-cooling wall and realize following effect:
1. increase the heat exchange area of CFB boiler burner hearth, play and reduce and the effect of equilibrium lower hearth temperature；
2. make bed temperature more uniform, reduce the original raw amount of NOx, play facilitation to realizing ultra-low NOx emission；
3. extension water-cooling wall guides material particles and flow of flue gas in burner hearth, uniform flow field and prevent side wear；
This extension water wall structure is simple, it is easy to manufactures and installs；It is applied widely, it is possible in various CFB boiler
Use, particularly Large Copacity CFB boiler and Supercritical CFB Boiler, and Large CFB Boiler transformation uses.
Accompanying drawing explanation
Fig. 1 is the structural representation of the recirculating fluidized bed burner hearth embodiment 1 of band extension water-cooling wall.
Fig. 2 is the layout schematic diagram extending water-cooling wall in Fig. 1.
Fig. 3 is the structural representation of embodiment 2.
Fig. 4 is the structural representation of embodiment 3.
Fig. 5 is the structural representation of extension water-cooling wall.
In figure: burner hearth-1, furnace outlet-2, extension water-cooling wall-3, water screen tube-3a, junction steel plate-3b, front face-
1a, rear surface-1b, side wall surface-1c, air distribution plate-1d, ceiling-1e, decline granular layer-4.
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is further described.
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Speciality and/or step beyond, all can combine by any way, unless specifically stated otherwise, all can by other equivalence or there is class
Replaced like the alternative features of purpose, i.e. unless specifically stated otherwise, in a series of equivalences of each feature or similar characteristics
Individual embodiment.
As Figure 1-5, the recirculating fluidized bed burner hearth of this utility model band extension water-cooling wall, it includes boiler furnace 1 He
Extension water-cooling wall 3, the top of burner hearth 1 is provided with furnace outlet 2.Extension water-cooling wall 3 includes water screen tube 3a and junction steel plate 3b, water
Cold wall pipe 3a is connected with the inwall of burner hearth 1 by junction steel plate 3b.Specifically, before and after the inwall of burner hearth 1 is mainly by being positioned at
Front face 1a and rear surface 1b, it is positioned at the side wall surface 1c of both sides, is positioned at the air distribution plate 1d of bottom and is positioned at the ceiling 1e group at top
Becoming, extension water-cooling wall 3 is at least connected with one of left wall face 1a, right wall 1b or positive wall 1c.The width of extension water-cooling wall 3 is little
In or equal to 1 meter, specifically, extension water-cooling wall 3 is vertically arranged, and its width is less than the width declining granular layer 4.Extension water-cooled
The heat exchange area of wall 3 is corresponding with the inwall lateral area of burner hearth 1.Specifically, the heat exchange gross area and the antetheca of water-cooling wall 3 are extended
Face 1a, rear surface 1b approximate in similar region (in the A B C region in such as Fig. 2) with the area sum of two side walls 1c
Equal.
Embodiment 1, as shown in Figure 1, 2:
In more than 300MWe large circulating fluidized bed boiler: by the quantity of furnace outlet, burner hearth is divided into sectional area phase
Deng region, tri-districts of A, B, C as shown in Figure 2.The wall heat exchange area of the extension water-cooling wall in tri-districts of A, B, C adds
A, B, C trizonal inboard wall of burner hearth face heat exchange area sum approximately equal.Two sides all heat exchange of extension water-cooling wall, calculate heat exchange
Should take in during area.This is advantageous particularly for homogeneous temperature in large-size circulating fluidized bed burner hearth.
The top of extension water-cooling wall 3 passes the ceiling 1e of burner hearth, and bottom passes the rear surface 1b near air distribution plate 1d.Burner hearth
Outlet 2 is arranged on rear surface 1b, and extension water-cooling wall 3 is connected with rear surface 1b, and extension water-cooling wall 3 is located at furnace outlet 2 times
Outside the extended line of inclined wall.Such layout can be effectively increased the heat exchange area of lower furnace portion, reduces lower furnace portion temperature,
Suitably temperature can suppress burning to produce the amount of nitrogen oxide NOx, improves the desulfuration efficiency of CFBB.
Embodiment 2, as shown in Figure 3:
The top of extension water-cooling wall 3 passes the rear surface 1b below furnace outlet 2, and bottom passes after air distribution plate 1d
Wall 1b.Extension water-cooling wall passes burner hearth from the lower section of furnace outlet, and preventing extending water-cooling wall affects flue gas flow direction furnace outlet.
Embodiment 3, as shown in Figure 4:
The top of extension water-cooling wall 3 passes ceiling 1e, and bottom passes the middle part of rear surface 1b.Thus will not with under burner hearth
The opening in portion influences each other.This embodiment is particularly suitable for boiler improvement and uses, and built CFBB, when fuel is sent out
Changing, or other reasons causes burner hearth heat exchange area not enough, uses during fire box temperature height.Built recirculating fluidized bed pot
Stove lower furnace portion is provided with feedback outlet, feed (coal, limestone) mouth, air port etc., and extension water-cooling wall needs to avoid these openings.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (9)
1. a recirculating fluidized bed burner hearth for band extension water-cooling wall, including boiler furnace (1), the top of burner hearth (1) is provided with burner hearth
Outlet (2), it is characterised in that: also including extending water-cooling wall (3), described extension water-cooling wall (3) is connected with the inwall of burner hearth (1),
The width of extension water-cooling wall (3), less than or equal to 1 meter, extends the heat exchange area of water-cooling wall (3) and the inwall lateral area of burner hearth (1)
Corresponding.
2. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 1, it is characterised in that: extension water-cooling wall (3)
Being vertically arranged, its width is less than the width declining granular layer (4).
3. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 1, it is characterised in that: extension water-cooling wall (3)
Including water screen tube (3a) and junction steel plate (3b), water screen tube (3a) is by the inwall phase of junction steel plate (3b) with burner hearth (1)
Even.
4. the recirculating fluidized bed burner hearth of the band extension water-cooling wall as described in arbitrary in claim 1,2 or 3, it is characterised in that:
The inwall of burner hearth (1) is mainly by being positioned at front face (1a) and rear surface (1b), being positioned at the side wall surface (1c) of side, be positioned at bottom
Air distribution plate (1d) and be positioned at top ceiling (1e) composition, extension water-cooling wall (3) at least with front face (1a), rear surface (1b) or
One of person's side wall surface (1c) is connected.
5. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 4, it is characterised in that: extension water-cooling wall (3)
The total length that is heated corresponding with the length sum of front face (1a), rear surface (1b) and side wall surface (1c).
6. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 5, it is characterised in that: extension water-cooling wall (3)
Top pass the ceiling (1e) of burner hearth, bottom passes the right wall (1b) near air distribution plate (1d).
7. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 5, it is characterised in that: extension water-cooling wall (3)
Top pass the right wall (1b) of furnace outlet (2) lower section, bottom passes the right wall (1b) near air distribution plate (1d).
8. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 5, it is characterised in that: extension water-cooling wall (3)
Top pass ceiling (1e), bottom passes the middle part of right wall (1b).
9. the recirculating fluidized bed burner hearth of band extension water-cooling wall as claimed in claim 5, it is characterised in that: furnace outlet (2) sets
Being placed on rear surface (1b), extension water-cooling wall (3) is connected with rear surface (1b), and furnace outlet (2) is located in extension water-cooling wall (3)
Beyond the extended line of inclined plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620277543.2U CN205535720U (en) | 2016-04-06 | 2016-04-06 | Circulating fluidized bed furnace of area extension water -cooling wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620277543.2U CN205535720U (en) | 2016-04-06 | 2016-04-06 | Circulating fluidized bed furnace of area extension water -cooling wall |
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| CN205535720U true CN205535720U (en) | 2016-08-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107339701A (en) * | 2017-08-16 | 2017-11-10 | 深圳市能源环保有限公司 | A kind of waste incinerator of low nitrogen burning |
-
2016
- 2016-04-06 CN CN201620277543.2U patent/CN205535720U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107339701A (en) * | 2017-08-16 | 2017-11-10 | 深圳市能源环保有限公司 | A kind of waste incinerator of low nitrogen burning |
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