CN102095197B - Hearth of circulating fluidized bed boiler with bottom slag cooling and central air supply integrated design - Google Patents
Hearth of circulating fluidized bed boiler with bottom slag cooling and central air supply integrated design Download PDFInfo
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- CN102095197B CN102095197B CN2011100549246A CN201110054924A CN102095197B CN 102095197 B CN102095197 B CN 102095197B CN 2011100549246 A CN2011100549246 A CN 2011100549246A CN 201110054924 A CN201110054924 A CN 201110054924A CN 102095197 B CN102095197 B CN 102095197B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention provides a hearth of a circulating fluidized bed boiler with a bottom slag cooling and central air supply integrated design, which comprises a hearth body, an air supply device, a bottom slag cooling and air supply cover and a slag discharging channel, wherein the air supply device is arranged at the bottom of the hearth body; the bottom slag cooling and air supply cover is arranged in the hearth body and installed above the air supply device, and comprises a slag inlet formed at the lower part of the side wall of the bottom slag cooling and air supply cover and a return air inlet formed at the upper part of the side wall of the bottom slag cooling and air supply cover and/or on a top cap; and the upper end of the slag discharging channel extends to the interior of the bottom slag cooling and air supply cover, and the lower end of the slag discharging channel extends to the exterior of the hearth body. The bottom slag cooling and air supply cover provided with the slag inlet and the return air inlet is utilized according to the hearth of the circulating fluidized bed boiler provided by the invention to simultaneously realize the purposes of cooling bottom slag and supplementing oxygen in the central region of the hearth body; and the bottom slag cooling and air supply cover and the hearth body of the boiler are integrally designed, thus the structure is simple, and the problem of differential expansion between the hearth and the bottom slag cooling and air supply cover is easy to solve.
Description
Technical field
The present invention relates to the combustion apparatus field, relate in particular to the boiler hearth of circulating fluidized bed of slag cooling of a kind of end and center air feed integration design.
Background technology
CFBB is to use at present boiler plant comparatively widely, because it has flameholding, clean environment firendly, efficiently characteristics such as low dirt and the extremely favor of power-generating enterprise.Along with the increase of the development of technology and the market demand, the big capacity high parameter of CFBB forward direction develops, and the CFBB of existing considerable 300 MW class is put into commercial operation at present.
CFBB generally with high ash content colm as main fuel; Can produce a large amount of end slags at furnace bottom after the burning; Because these end slags have characteristics such as temperature height (about 900 ℃), flowability and poor controllability, it is cooled off and the bigger technical difficulty of existence when discharge.In the prior art; Generally, realize the cooling discharging of end slag, wherein through special cold slag equipment is set; Use the widest cold slag equipment and comprise roller slag cooler and spent-bed cooler; These equipment all and separate between the boiler hearth of circulating fluidized bed need design respectively, have increased the cost of CFBB.In addition, all there are shortcomings such as limited, poorly sealed, the operation maintenance difficulty of exerting oneself usually in existing slag cooler, when also being difficult to satisfy the CFBB day-to-day operation end slag is cooled off the needs of discharging.
On the other hand; Increase along with the CFBB capacity; The cross-sectional area of burner hearth increases thereupon, makes the overfire air port arranged on the sidewall around the burner hearth reach several meters and even tens meters apart from the distance at burner hearth center, and the secondary wind that causes feeding through overfire air port is difficult to rely on sprays and diffusion arrives the burner hearth central area; And then make the burner hearth central area be in the state of severe depletion of oxygen, just make the center of burner hearth have oxygen-depleted zone A as shown in Figure 1.The fuel that is positioned at oxygen-depleted zone A can not be fully burned, and makes that the fly ash combustible material in the burner hearth increases, and has reduced the operating efficiency of CFBB widely.
Situation for the burner hearth center anoxic of improving large circulating fluidized bed boiler; The general employing reduced furnace width; Perhaps increase the penetration capacity measures such as (as improving secondary wind flow velocity or momentum of impinging jet) of secondary wind; But these methods all receive the restriction of factors such as chamber structure, and effect is also very limited.China introduces the burner hearth that ALSTOM company adopts " pants " leg structure as shown in Figure 2; Secondary wind feeds through " pants " leg central neutral gear zone of making a slit or vent; Shortened the distance of overfire air port, improved the situation of oxygen undersupply in the burner hearth significantly apart from the burner hearth center.A large amount of pipelines, valve have been arranged in central neutral gear zone but it is made a slit or vent, complex structure, and manufacturing cost is high, and operational reliability is poor, and can bring a series of new technical problems such as tilting table.
Though; Also there are at present some patents to propose to solve the scheme of technical problem of end slag cooling discharging and the burner hearth center anoxic of ciculation fluidized boiler; But these technology all only can solve the problem of an aspect, and can't solve the technical problem of above-mentioned two aspects and complex structure simultaneously; Manufacturing cost is higher, can't really improve the operating efficiency of CFBB.
Summary of the invention
The object of the invention is to provide the boiler hearth of circulating fluidized bed of slag cooling of a kind of end with center air feed integration design; Chamber structure to solve existing CFBB is complicated, manufacturing cost is high, and can't realize the technical problem of end slag cooling discharging and burner hearth Central oxygen-supply function simultaneously.
For realizing above-mentioned purpose; The invention provides the boiler hearth of circulating fluidized bed of slag cooling of a kind of end and center air feed integration design; Comprise burner hearth body and the air supply device that is arranged at the bottom of burner hearth body; This burner hearth also comprises: end slag cooling air feed cover, and be arranged on the inside of burner hearth body and be installed in the top of air supply device, end slag cooling air feed cover comprises the slag inlet that is arranged at its lower sidewall and is arranged at the return air inlet on its side wall upper part and/or the top cover; And slagging channel, its upper end extends to the inside of end slag cooling air feed cover, and its lower end extends to the outside of burner hearth body.
Further, end slag cooling air feed cover is positioned at the base of burner hearth body.
Further, the horizontal cross-section of end slag cooling air feed cover is a rectangle, trapezoidal or circular, and end slag cooling air feed cover is variable section structure or uiform section structure.
Further, end slag cooling air feed cover is built by laying bricks or stones by castable refractory and refractory brick and is formed.
Further, end slag cooling air feed cover is surrounded by the membrane type heated surface bundle, is laid with abrasion-proof and refractory pouring material on the surfaces externally and internally of membrane type heated surface bundle.
Further, end slag cooling provided by the invention comprises at least one end slag cooling air feed cover with the boiler hearth of circulating fluidized bed of center air feed integration design.
Further, comprise at least one slag inlet and at least one return air inlet on the end slag cooling air feed cover.
Further, be provided with heated surface bundle in the end slag cooling air feed cover, heated surface bundle has cooling fluid and flows into end and cooling fluid outflow end.
Further, heated surface bundle is intrafascicular a kind of of light pipe formula, membrane type, H type or Ω type heating surface tube.
Further, the end provided by the invention slag cooling also comprises with the boiler hearth of circulating fluidized bed of center air feed integration design: the cooling fluid service tank is arranged at the below or the both sides of air supply device and flows into end with cooling fluid and links to each other; The cooling fluid collection box is arranged at below or the both sides of air supply device and flows into end with cooling fluid and links to each other.
Further, air supply device comprises: air distribution plate is arranged at the bottom of the air distribution plate under the slag cooling air feed cover; Air compartment, its sidewall and/or bottom surface are provided with the inlet air channel and are arranged at the below of air distribution plate.
Further, air distribution plate is provided with the air feed structure, and wherein, first air distribution plate is positioned at outside the end slag cooling air feed cover institute region covered; Second air distribution plate is positioned at end slag cooling air feed cover institute region covered; Air compartment comprises: first air compartment is arranged at the below of first air distribution plate; Second air compartment is arranged at the below of second air distribution plate, is communicated with first air compartment.
Further, the air feed structure is the blast cap array that a plurality of blast caps form.
Further, the position near slag inlet is provided with wind cap or purging air port towards slag inlet on first air distribution plate.
Further, air distribution plate is steel plate or is formed by fin panel casing bending.
Further, be provided with Fire and abrasion resistant material on inner wall surface, outer wall surface and the air distribution plate of end slag cooling air feed cover.
The present invention has following beneficial effect:
The end provided by the invention slag cooling is cooled off the air feed cover and on this end slag cooling air feed cover, slag inlet and return air inlet is set through end slag is set in the burner hearth body with the boiler hearth of circulating fluidized bed that center air feed integration designs; Make this burner hearth can realize end slag is cooled off and replenishes the function of burner hearth body central area oxygen supply simultaneously; And the burner hearth body integrated design of end slag cooling air feed cover and boiler; Simple in structure, there is not mechanical component, install, move and overhaul simple and convenient; Practice thrift working space, be easy to handle the bloated poor problem between burner hearth and the end slag cooling air feed cover.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to figure below.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the boiler oxygen-depleted zone sketch map of prior art;
Fig. 2 is the boiler structure sketch map of prior art " pants " leg form;
Fig. 3 is the chamber structure sketch map of the preferred embodiment of the present invention;
Fig. 4 covers on the structural representation of the intrinsic first kind of arrangement of burner hearth along the B-B among Fig. 3 to the end of the preferred embodiment of the present invention of observing slag cooling air feed;
Fig. 5 covers on the structural representation of the intrinsic second kind of arrangement of burner hearth along the B-B among Fig. 3 to the end of the preferred embodiment of the present invention of observing slag cooling air feed;
Fig. 6 covers on the structural representation of intrinsic the third arrangement of burner hearth along the B-B among Fig. 3 to the end of the preferred embodiment of the present invention of observing slag cooling air feed;
Fig. 7 covers on the structural representation of intrinsic the 4th kind of arrangement of burner hearth along the B-B among Fig. 3 to the end of the preferred embodiment of the present invention of observing slag cooling air feed;
Fig. 8 covers on the structural representation of intrinsic the 5th kind of arrangement of burner hearth along the B-B among Fig. 3 to the end of the preferred embodiment of the present invention of observing slag cooling air feed;
Fig. 9 is along the first kind shape and structure sketch map of the C among Fig. 3 to the slag inlet of the end of the preferred embodiment of the present invention of observing slag cooling air feed cover;
Figure 10 is along the second kind shape and structure sketch map of the C among Fig. 3 to the slag inlet of the end of the preferred embodiment of the present invention of observing slag cooling air feed cover;
Figure 11 is along the third shape and structure sketch map to the slag inlet of the end of the preferred embodiment of the present invention of observing slag cooling air feed cover of the C among Fig. 3;
Figure 12 is along the first kind shape and structure sketch map of the D among Fig. 3 to the return air inlet of the end of the preferred embodiment of the present invention of observing slag cooling air feed cover;
Figure 13 is along the second kind shape and structure sketch map of the D among Fig. 3 to the return air inlet of the end of the preferred embodiment of the present invention of observing slag cooling air feed cover;
Figure 14 is along the third shape and structure sketch map to the return air inlet of the end of the preferred embodiment of the present invention of observing slag cooling air feed cover of the D among Fig. 3;
When Figure 15 is first kind of arrangement of end slag cooling air feed cover employing of the preferred embodiment of the present invention, the structural representation of the heated surface bundle that it is inner;
When Figure 16 is the third arrangement of end slag cooling air feed cover employing of the preferred embodiment of the present invention, the structural representation of the heated surface bundle that it is inner;
Figure 17 is first kind of structural representation of the blast cap of the preferred embodiment of the present invention;
Figure 18 is second kind of structural representation of the blast cap of the preferred embodiment of the present invention;
Figure 19 is the third structural representation of the blast cap of the preferred embodiment of the present invention;
Figure 20 is the 4th a kind of structural representation of the blast cap of the preferred embodiment of the present invention;
Figure 21 is the 5th a kind of structural representation of the blast cap of the preferred embodiment of the present invention; And
Figure 22 is the structural representation of wind cap at slag inlet place of the end slag cooling air feed cover of the preferred embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Fig. 3 is the structural representation of the burner hearth of the preferred embodiment of the present invention.As shown in Figure 3, the invention provides the boiler hearth of circulating fluidized bed that slag cooling of a kind of end and center air feed integration design, this burner hearth comprises: burner hearth body 10; Air supply device is arranged at the bottom of burner hearth body 10; End slag cools off air feed cover 20, is arranged on the top of air supply device, and the lower sidewall of slag cooling air feed cover 20 is provided with slag inlet 21 end of at, and the side wall upper part and/or the top cover of end slag cooling air feed cover 20 are provided with return air inlet 23; Slagging channel 30, its upper end, promptly the slag input end extends to the inside of end slag cooling air feed cover 20, its slag output end, promptly the deslagging end extends to the outside of burner hearth body 10, and specifically, the deslagging end of slagging channel 30 passes the outside that air supply device extends to burner hearth body 10.
Fig. 4 is the structural representation that the end slag cooling air feed of the preferred embodiment of the present invention covers on the intrinsic first kind of arrangement of burner hearth; Fig. 5 is the structural representation that the end slag cooling air feed of the preferred embodiment of the present invention covers on the intrinsic second kind of arrangement of burner hearth, like Fig. 4 and shown in Figure 5.The quantity of end slag cooling air feed cover 20 can be one; Slag cooling air feed cover 20 at the bottom of can being provided with one in the burner hearth body 10; This air feed cover can be along the cross section that laterally or vertically runs through whole burner hearth body 10 of burner hearth body 10; Can not run through yet, and can be set to rectangle or shape such as trapezoidal.At this moment, the air supply device of burner hearth body 10 belows is separated into the two big zones that directly are not communicated with.
The quantity of end slag cooling air feed cover 20 also can be for a plurality of, and various ways also can be adopted in its shape and structure and the installation site in burner hearth body 10.Fig. 6 to Fig. 8 be respectively the end slag cooling air feed of the preferred embodiment of the present invention cover on burner hearth intrinsic the third, the 4th kind, and the structural representation of the 5th kind of arrangement.
As shown in Figure 6, it is slag cooling of foursquare end air feed cover 20 that two cross sections can be set in the burner hearth body 10, and each air feed cover can be arranged on the centre position of burner hearth body 10.As shown in Figure 7, two cross sections also can be arranged on burner hearth body 10 for the circular end 20, two air feed covers of slag cooling air feed cover centre position can also be set in the burner hearth body 10.Except above-mentioned installation site; End slag cooling air feed cover 20 can also be arranged on the perimeter of burner hearth body 10; As shown in Figure 8, when burner hearth body 10 when to be that the cross section is rectangular wait polygonized structure, can be provided with one at each drift angle place of burner hearth body 10 at the bottom of slag cooling air feed cover 20.For example, burner hearth body 10 is the rectangular structure in cross section, and an end slag cooling air feed cover 20 that the cross section is rectangular then can be set respectively at four drift angle places.In fact, the shape of burner hearth body 10 and end slag cooling air feed cover 20 can be designed to various ways, and the installation site of end slag cooling air feed cover 20 in burner hearth body 10 also can change according to the variation of actual working environment.Such as, both all can adopt shapes such as circle, trapezoidal, conical, truncated cone-shaped, and end slag cooling air feed cover 20 also can be provided with along the base of burner hearth body 10, adopts which kind of structure and arrangement not to receive the restriction of this specification.
End slag cooling air feed cover 20 can that is to say that end slag cooling air feed cover 20 can also be shapes such as truncated cone-shaped or taper for variable section structure or uiform section structure.The fluidisation cooling air that passes the inner chamber of air feed cover can be controlled in the scope of 0.5～10m/s at the superficial linear velocity in a column of each section.
In order to improve the performance of end slag cooling air feed cover 20 fireproof high-temperature resistants, this air feed cover can be built by laying bricks or stones by castable refractory and refractory brick and formed.In addition, in order to improve the anti-wear performance of end slag cooling air feed cover 20, on the inwall of air feed cover and outer wall surface, can also be provided with high-abrasive material.
In fact, end slag cooling air feed cover 20 can also be formed by the bending of membrane type heated surface bundle, and on the surfaces externally and internally of membrane type heated surface bundle, is laid with abrasion-proof and refractory pouring material.So just can utilize the surface of end slag cooling air feed cover 20 to realize end slag cooling purpose.
Fig. 9 to Figure 11 is respectively first kind, second kind and the third shape and structure sketch map that the end slag of the preferred embodiment of the present invention cools off the slag inlet of air feed cover.To shown in Figure 11, can be provided with one or more slag inlets 21 on the end slag cooling air feed cover 20 like Fig. 9, and each slag inlet 21 combined shaped that can constitute for one or more shapes in rectangle, trapezoidal, polygon, circle or the ellipse.For example, the quantity of the slag inlet 21 of each end slag cooling air feed cover 20 is two, each one of left-right symmetric, and its cross sectional shape is a rectangle.Also such as, the quantity of the slag inlet 21 of each slag cooling air feed cover 20 is four the end, each two of left-right symmetric, its cross sectional shape is an arch, promptly bottom rectangle, top are semicircle.
The base of slag inlet 21 can be higher than the air feed mouth of air supply device, also can with the air feed mouth coplane of air supply device.
Figure 12 to Figure 14 is first kind, second kind and the third shape and structure sketch map that the end slag of the preferred embodiment of the present invention cools off the return air inlet of air feed cover.To shown in Figure 14, can be provided with one or more return air inlets 23 on the end slag cooling air feed cover 20 like Figure 12, the shape of return air inlet 23 can be any or several kinds of combined shaped that shape constitutes in rectangle, S shape, T shape or the umbrella shape.For example, the quantity of return air inlet 23 is ten, each five of left-right symmetric, and it is Z-shaped that the shape of each return air inlet all is, and cross section is a rectangle.Also such as, the quantity of return air inlet 23 is six, each three of left-right symmetric, the shape of each return air inlet is straight-through shape, cross section is a rectangle, and the wind circulation passage that forms of a plurality of return air inlet can horizontal arrangement, also can be in tilted layout.
For the effect that end slag is realized better cool; In each end slag cooling air feed cover 20, be provided with heated surface bundle 40; This heated surface bundle 40 has cooling fluid and flows into end and cooling fluid outflow end; Wherein, cooling fluid flows into end can be through linking to each other with cooling fluid service tank 41, and the cooling fluid outflow end can link to each other with cooling fluid collection box 43.
When Figure 15 is first kind of arrangement of end slag cooling air feed cover employing of the preferred embodiment of the present invention; The structural representation of the heated surface bundle that it is inner; When Figure 16 is the third arrangement of end slag cooling air feed cover employing of the preferred embodiment of the present invention, the structural representation of the heated surface bundle that it is inner.Like Figure 15 and shown in Figure 16; When slag cooling of a plurality of ends air feed cover is set in the burner hearth body 10; A corresponding heated surface bundle 40 can be set respectively in each air feed cover; Each heated surface bundle can have cooling fluid service tank 41 and cooling fluid collection box 43 separately respectively, and cooling fluid service tank 41 can be set to same casing with cooling fluid collection box 43.When end slag cooling air feed cover 20 runs through burner hearth body 10; Can adopt a heated surface bundle 40 that also runs through burner hearth body 10, and the cooling fluid service tank of this heated surface bundle 40 41 and cooling fluid collection box 43 can be separately positioned on the both sides of burner hearth body 10.And, from Figure 15, also can find out, in order to improve end slag discharge capacity, can suitably increase or reduce the quantity of slagging channel 30 according to the area coverage of end slag cooling air feed cover 20, for example can adopt two slagging channels 30 shown in Figure 15.
In order to improve the service life of heated surface bundle 40; The zone easy to wear of heated surface bundle 40; Different abrasionproof measures can be adopted according to operating position in windward side, elbow, periptery that comprises pipe etc.; Protect watt, abrasionproof pin, abrasionproof spraying, adopt thick-walled pipe etc., like wear-resistant castable, abrasionproof to alleviate the wearing and tearing of particle to pipe.If do not adopt heated surface bundle 40, then the cooling of end slag is mainly realized by fluidized wind.
The source of the cooling medium in the heated surface bundle 40 can be make-up water, condensate, feedwater, saturation water, saturated vapor, superheated steam and the reheated steam etc. of boiler unit, also can be that other source is like industry water, hot net water etc.
Preferably; As shown in Figure 3; Air supply device comprises: air distribution plate and the air compartment that is arranged on the air distribution plate below; End slag cooling air feed cover 20 is arranged on the air distribution plate, and wherein, air distribution plate can comprise second air distribution plate 63 that is positioned at the first outer air distribution plate 61 of the end 20 region covered of slag cooling air feed cover and is positioned at 20 region covered of end slag cooling air feed cover; Air compartment can comprise first air compartment 62 and second air compartment 64 that lays respectively at first air distribution plate, 61 belows and second air distribution plate, 63 belows, and the sidewall of first air compartment 62 and second air compartment 64 or bottom surface can be respectively arranged with the first inlet air channel 65 and the second inlet air channel 67.
First air distribution plate 61 and second air distribution plate 63 can adopt the one design, also can design separately separately, and the height of two air distribution plates can be identical, also can have certain height poor, and second air distribution plate 63 can be arranged horizontally, and also tiltable is arranged.And second air distribution plate 63 also can constitute an integral body with end slag cooling air feed cover 20; Be installed in again on the air distribution plate of original burner hearth bottom; Perhaps directly with end slag cooling air feed cover 20 as one independently parts be installed on the air distribution plate of original burner hearth body 10 bottoms, improve the improved flexibility of CFBB.
When two air distribution plates adopted the one design, first air compartment 62 and second air compartment 64 also can adopt and be wholely set; When two air distribution plates adopted the split structural design, first air compartment 62 and second air compartment 64 also can adopt the split setting, and two air compartments can be isolated each other, have inlet air channel separately respectively, also can be interconnected, and utilize common inlet air channel.No matter slag cooling of several ends air feed cover 20 is set in the burner hearth body 10, and every air distribution plate zone that is covered by end slag cooling air feed cover 20 is second air distribution plate 63, and remainder is first air distribution plate 61.
No matter adopt the air compartment structure of which kind of form, cooling fluid service tank 41 and cooling fluid collection box 43 can be arranged on a side, both sides or the bottom of air compartment, and link to each other with cooling fluid inflow end and cooling fluid outflow end respectively through connecting line.
In order to play better air feed effect; Can on two air distribution plates, air feed structure 68 be set all, this air feed structure 68 can be a blast cap, also can only on first air distribution plate 61, blast cap be set; And blast cap is not set on second air distribution plate 63; At this moment, second air distribution plate 63 can adopt the air feed pipe to spray into or the air feed structure of other form, realizes carrying out air feed in the end slag cooling air feed cover 20.Need to prove at this, only show the structure that all adopts the blast cap of equal height on first air distribution plate 61 and second air distribution plate 63 among Fig. 3.
In addition, from Figure 16, it can also be seen that, when slag cooling of a plurality of ends air feed cover 20 is set in burner hearth; Can be only on second air distribution plate 63; On the air distribution plate that is just covered by end slag cooling air feed cover 20 blast cap is set, and on first air distribution plate 61, the air distribution plate top that is not just covered by end slag cooling air feed cover 20 is not provided with blast cap; And adopt other air feed structures, like air feed pipe etc.
Figure 17 to Figure 21 be respectively first kind, second kind of blast cap of the preferred embodiment of the present invention, the third, the 4th kind; And the 5th kind of structural representation; Shown in Figure 17 to 21, blast cap can adopt existing different fluid bed cap structures such as pigtail shape, T type, mushroom-shaped, bell jar type or orthotype.
The blast cap on first air distribution plate 61 or the air outlet of air feed pipe can be lower than the height of slag inlet 21, so that form certain space between end slag and the air distribution plate, prevent that the end slag from all dropping on the air distribution plate, are convenient to end slag and get into slag inlet.
Figure 22 is the structural representation of wind cap at slag inlet place of the end slag cooling air feed cover of the preferred embodiment of the present invention, and is shown in figure 22.For the ease of the migration of end slag, can on first air distribution plate 61, arrange wind cap 69 in the zone near slag inlet 21 or purge the air port.
Preferably, first air distribution plate 61 and second air distribution plate 63 can be formed by steel plate or fin panel casing bending one, also can adopt identical or different mode split to form respectively.
In order to improve the service life of boiler, can be the end of at inner wall surface, outer wall surface and the air distribution plate (also can only at second air distribution plate 63) of slag cooling air feed cover 20 go up and lay Fire and abrasion resistant material to prevent wearing and tearing.
The lime-ash flow process of CFBB provided by the invention is:
The fuel of adding boiler hearth of circulating fluidized bed waits mixed combustion formation end slag in burner hearth body 10 with the bed material; Part end slag is at the bottom of slag inlet 21 inflows in the slag cooling air feed cover 20; Cool off the common cooling of the fluidized wind and the heated surface bundle 40 that Qi Nei arranges of air feed cover 20 through end slag; Reduce temperature, and discharged by slagging channel 30, the sub-fraction fine grained in the end slag returns burner hearth body 10 with fluidized wind through return air inlet 23.
According to another aspect of the present invention, a kind of CFBB is provided also, this CFBB comprises above-mentioned burner hearth.
The distinguished and admirable journey of CFBB provided by the invention is:
Fluidisation that temperature is lower and cooling air get into second air compartment 64 by the second inlet air channel 67; Second air distribution plate 63 and the blast cap of arranging on it; Get in the cavity of end slag cooling air feed cover 20; With the end solid impurity particle fluidisation cooling in the cover, and contact with the surface of heated surface bundle 40 and to carry out heat exchange, make end slag obtain cooling off.The fluidized wind that temperature is lower is heated by end slag, and carries the parts of fine particle, returns burner hearth body 10 through return air inlet 23.The fluidized wind that returns burner hearth body 10 use wind as the part burning of boiler, and the amount of oxygen of the central area in the middle part of the burner hearth is replenished, and improves the situation of burner hearth central area amount of oxygen undersupply.
Cooling medium in the heated surface bundle 40 can be water or steam etc., and the flow process of cooling medium is:
The cooling medium that temperature is lower flows into end from cooling fluid service tank 41 through cooling fluid and gets in the heated surface bundle 40; Flow through heated surface bundle 40; Carry out being heated after the surface-type heat exchange with slag at the bottom of the pipe high temperature outward, flow in the cooling fluid collection box 43 through the cooling fluid outflow end.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. the boiler hearth of circulating fluidized bed of slag cooling and center air feed integration design at the bottom of a kind comprises burner hearth body (10) and is arranged at the air supply device (60) of the bottom of said burner hearth body (10), it is characterized in that also comprising:
End slag cooling air feed cover (20); Be arranged on the inside of said burner hearth body (10) and be installed in the top of said air supply device (60), slag of said end cooling air feed cover (20) comprises the slag inlet (21) that is arranged at its lower sidewall and is arranged at the return air inlet (23) on its side wall upper part and/or the top cover; And slagging channel (30), its upper end extends to the inside of slag cooling air feed cover of the said end (20), and its lower end extends to the outside of said burner hearth body (10).
2. the end according to claim 1 slag cooling and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that slag of said end cooling air feed cover (20) is positioned at the base of said burner hearth body (10).
3. the boiler hearth of circulating fluidized bed of the end according to claim 1 slag cooling and center air feed integration design; It is characterized in that; The horizontal cross-section of slag cooling air feed cover of the said end (20) is a rectangle, trapezoidal or circular, and slag of said end cooling air feed cover (20) is variable section structure or uiform section structure.
4. according to the boiler hearth of circulating fluidized bed of each slag cooling of described end in the claim 1 to 3, it is characterized in that slag of said end cooling air feed cover (20) is built by laying bricks or stones by castable refractory and refractory brick and formed with center air feed integration design.
5. according to the boiler hearth of circulating fluidized bed of each slag cooling of described end in the claim 1 to 3 with center air feed integration design; It is characterized in that; Slag cooling air feed cover of the said end (20) is surrounded by the membrane type heated surface bundle, is laid with abrasion-proof and refractory pouring material on the surfaces externally and internally of said membrane type heated surface bundle.
6. the end according to claim 1 slag cooling and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that comprising at least one slag cooling of said end air feed cover (20).
7. the end according to claim 1 slag cooling and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that, comprise at least one said slag inlet (21) and at least one said return air inlet (23) on slag of the said end cooling air feed cover (20).
8. the boiler hearth of circulating fluidized bed of the end according to claim 1 slag cooling and center air feed integration design; It is characterized in that; Be provided with heated surface bundle in the slag cooling air feed cover of the said end (20), said heated surface bundle has cooling fluid and flows into end and cooling fluid outflow end.
9. the boiler hearth of circulating fluidized bed of the end according to claim 8 slag cooling and center air feed integration design is characterized in that, said heated surface bundle (40) is intrafascicular a kind of of light pipe formula, membrane type, H type or Ω type heating surface tube.
10. the end according to claim 9 slag cooling and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that also comprising:
Cooling fluid service tank (41) is arranged at below or the both sides of said air supply device and flows into end with said cooling fluid and links to each other;
Cooling fluid collection box (43) is arranged at below or the both sides of said air supply device and links to each other with said cooling fluid outflow end.
11. cooling of the end according to claim 1 slag and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that said air supply device (60) comprising:
Air distribution plate (61,63) is arranged under the slag cooling air feed cover of the said end (20);
Air compartment (62,64), its sidewall and/or bottom surface are provided with inlet air channel (65,67) and are arranged at the below of said air distribution plate (61,63).
12. cooling of the end according to claim 11 slag and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that,
Said air distribution plate (61,63) comprises first air distribution plate (61) and second air distribution plate (63), is provided with air feed structure (68) on it, wherein:
Said first air distribution plate (61) is positioned at outside slag cooling air feed cover (20) the institute region covered of the said end;
Said second air distribution plate (63) is positioned at slag cooling air feed cover (20) institute region covered of the said end;
Said air compartment (62,64) comprising:
First air compartment (62) is arranged at the below of said first air distribution plate (61);
Second air compartment (64) is arranged at the below of said second air distribution plate (63), is communicated with said first air compartment (62).
13. cooling of the end according to claim 12 slag and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that, said air feed structure (68) is the blast cap array that a plurality of blast caps form.
14. the boiler hearth of circulating fluidized bed of cooling of the end according to claim 12 slag and center air feed integration design; It is characterized in that the position that said first air distribution plate (61) is gone up near said slag inlet (21) is provided with wind cap (69) or purging air port towards said slag inlet (21).
15. cooling of the end according to claim 11 slag and the boiler hearth of circulating fluidized bed that center air feed integration designs is characterized in that, said air distribution plate (61,63) forms for steel plate or by the fin panel casing bending.
16. the boiler hearth of circulating fluidized bed of cooling of the end according to claim 11 slag and center air feed integration design; It is characterized in that, be provided with Fire and abrasion resistant material on inner wall surface, outer wall surface and the said air distribution plate of slag of said end cooling air feed cover (20).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100549246A CN102095197B (en) | 2011-03-08 | 2011-03-08 | Hearth of circulating fluidized bed boiler with bottom slag cooling and central air supply integrated design |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100549246A CN102095197B (en) | 2011-03-08 | 2011-03-08 | Hearth of circulating fluidized bed boiler with bottom slag cooling and central air supply integrated design |
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| CN102095197A CN102095197A (en) | 2011-06-15 |
| CN102095197B true CN102095197B (en) | 2012-08-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109167A (en) * | 2011-03-24 | 2011-06-29 | 中色奥博特铜铝业有限公司 | Slagging and fluidifying device of circulating fluidized bed boiler |
| CN103411223A (en) * | 2013-08-21 | 2013-11-27 | 南通万达锅炉有限公司 | Slag falling system of garbage boiler |
| CN103900076B (en) * | 2014-03-24 | 2016-09-14 | 中国华能集团清洁能源技术研究院有限公司 | A kind of minimum discharge electricity generation system using low calorie fuels |
| CN107013904A (en) * | 2017-04-14 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of CFBB A types blast cap and its manufacture method |
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| US4227488A (en) * | 1978-10-03 | 1980-10-14 | Foster Wheeler Energy Corporation | Fluidized bed unit including a cooling device for bed material |
| US4330502A (en) * | 1980-06-16 | 1982-05-18 | A. Ahlstrom Osakeyhtio | Fluidized bed reactor |
| CN1404915A (en) * | 1995-11-15 | 2003-03-26 | 株式会社荏原制作所 | Fluidized-bed reactor |
| CN1916491A (en) * | 2006-08-10 | 2007-02-21 | 上海锅炉厂有限公司 | Method for cooling bottom dregs at fluid bed boiler |
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| CN102095197A (en) | 2011-06-15 |
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