CN102840577B - Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger - Google Patents
Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger Download PDFInfo
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Abstract
The present invention discloses a circulation fluidized bed boiler having a compact type external dual fluidized bed heat exchanger, and relates to a large-scale fluidized bed technology. The circulation fluidized bed boiler comprises a wind chamber for providing fluidized wind, a hearth, a cyclone separator connected with a flue gas outlet on the upper part of the hearth, and an external dual fluidized bed heat exchanger arranged inside a hot material circulation loop, wherein the external dual fluidized bed heat exchanger comprises a solid particle outer circulation channel, a solid particle inner circulation channel, an outer circulation fluidized bed heat exchange chamber and an inner circulation fluidized bed heat exchange chamber, and various wind chambers of the external dual fluidized bed heat exchanger and the wind chamber of the hearth are closely arranged in parallel. According to the circulation fluidized bed boiler having the compact type external dual fluidized bed heat exchanger in the present invention, heat of a large amount of high temperature adherence particle flow in the dense phase region of the hearth is adopted so as to substantially increase heat exchange capacity of the external dual fluidized bed heat exchanger under different loads, solve problems of bed temperature stability and steam temperature stability under a low load, achieve independent adjustment and control according to requirements, and meet steam parameter requirements with a high level.
Description
Technical field
The present invention relates to circulating fluidized bed technique, particularly large circulating fluidized bed boiler.
Background technology
Along with the increase of CFBB capacity, the unbalanced increase of heat release and heat absorption will cause the Layout Problem of heating surface.In order to make heat release and balanced growth harmoniously of absorbing heat, the temperature of main circulation loop is controlled within normal range (NR), current effective method arranges external heat exchanger (Fluid Bed Heat Exchangers outward at burner hearth, FBHE), added the runing adjustment means of bed temperature and steam temperature by external heat exchanger, make boiler more easily adapt to varying load condition requirement.The external heat exchanger that Lurgi and Alstom company adopts, regulated by ash control valve and enter external heat exchanger and the circulating ash quantity directly returning burner hearth, thus reach the object regulating bed temperature and steam temperature, but ash control valve requirement on machining accuracy is high, main dependence on import, and expensive, this brings certain difficulty with popularization to the maintenance of external heat exchanger.Chinese patent CN00238546.5 discloses a kind of outer circulation compact splitting-type returning ash heat exchanger being applied to large circulating fluidized bed boiler, regulate high temperature to return ash quantity and low temperature by regulating Fluidization wind rate and return ratio between ash quantity, whole heat exchanger mechanical moving component, operation and maintenance is simplified, but this heat exchanger only adopts the fluid-bed heat exchanger of outer circulation, the demand of more elevated steam conditions grade is subject to certain restrictions.
When Boiler Steam parameter needs to reach higher parameter level, as supercritical parameter 460MW (27.5MPa/560 DEG C/580 DEG C) or ultra supercritical parameter 800MW (30.9MPa/604 DEG C/621 DEG C), if still adopt conventional single external external circulation fluidized bed heat exchanger cannot meet the requirement of elevated steam conditions grade, now need to design novel external fluid-bed heat exchanger, to provide sufficiently high exchange capability of heat to ensure the demand of elevated steam conditions grade.International monopoly WO2007/128883 discloses a kind of fluidized bed exchanger for CFBB and has the CFBB of fluidized bed exchanger, superheater and reheater is arranged in two heat-exchanging chambers up and down of connecting in main circulation loop, in utilizing, the heat of outer circulation solid particle obtains higher overheating steam temperature and reheat steam temperature, this heat-exchanging chamber arrangement is that the maximization of CFBB provides advantage, but because two heat-exchanging chambers misplace layout up and down, make the volume of two heat-exchanging chambers too huge, thus harsher requirement is proposed to the arrangement space of heat-exchanging chamber.
Summary of the invention
The object of the invention is to overcome the existing deficiency being applied to the external fluid-bed heat exchanger of large circulating fluidized bed boiler, a kind of CFBB with the external Double fluodized-bed heat exchanger of close-coupled is provided, there is provided more high-grade steam parameter by utilizing the heat of inside and outside cyclic high-temperature solid particle and realize the real integrated design of burner hearth and built-in fluid bed heat exchanger, providing a kind of close-coupled novel furnace structure for the maximization of CFBB and high parameterization develop.
For achieving the above object, technical solution of the present invention is as follows:
A kind of CFBB with the external Double fluodized-bed heat exchanger of close-coupled, comprise the burner hearth 2, cyclone separator 3 and the back-end ductwork that is connected with cyclone separator 3 exhanst gas outlet that connect successively, wherein be provided with air compartment 1 bottom burner hearth 2, it also comprises at least one external Double fluodized-bed heat exchanger 200
External Double fluodized-bed heat exchanger 200 is arranged in boiler hot Matter Transfer loop, comprising: external circulation fluidized bed Heat Room 7, ICFB Heat Room 9, solid particle first outer circulation passage 8 or solid particle second outer circulation passage 8 ', solid particle inner cycle channel 10;
Be provided with heat exchanger second wind transmission room 102 bottom external circulation fluidized bed Heat Room 7, in it, be provided with heat exchanger 71; Be provided with heat exchanger first class air compartment 101 bottom ICFB Heat Room 9, in it, be provided with heat exchanger 91; Solid particle first outer circulation passage 8 or solid particle second outer circulation passage 8 ' bottom are provided with heat exchanger the 3rd fluidisation air compartment 103, are provided with heat exchanger the 4th fluidisation air compartment 104 bottom described internal solids recirculation path 10;
External circulation fluidized bed Heat Room 7 is communicated with solid particle first outer circulation passage 8 by bottom through-hole 87, or is communicated with solid particle second outer circulation passage 8 ' by the second bottom through-hole 78 ';
ICFB Heat Room 9 is communicated with between burner hearth 2 by upper guide streaming blade feed arrangement 21; And be communicated with external circulation fluidized bed Heat Room 7 by upper through-hole 79, or be communicated with solid particle second outer circulation passage 8 ' by upper through-hole 98 ';
Solid particle inner cycle channel 10 is communicated with ICFB Heat Room 9 by bottom through-hole 92, is communicated with burner hearth 2 by overfall in top 22;
Heat exchanger first class air compartment 101, heat exchanger second wind transmission room 102, heat exchanger the 3rd fluidisation air compartment 103, heat exchanger the 4th fluidisation air compartment 104 are close to burner hearth fluidisation air compartment 1 horizontal alignment and arrange.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, external Double fluodized-bed heat exchanger 200 described in it also comprises a material shunting device 6, and material shunting device 6 comprises feeding-passage 61, first returning charge passage 62 and the second returning charge passage 63; Feeding-passage 61 is communicated with the first returning charge passage 62 by bottom through-hole, be communicated with the second returning charge passage 63 by upper through-hole, feeding-passage 61 top is communicated with cyclone separator 3 solid outlet, first returning charge passage 62 is communicated with burner hearth 2 or ICFB Heat Room 9 by top overflow through hole 23, and the second returning charge passage 63 is communicated with between external circulation fluidized bed Heat Room 7 or solid particle first outer circulation passage 8.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, it also comprises material returning device 4, and feeding-passage 61 top of the material shunting device 6 of described external Double fluodized-bed heat exchanger 200 is communicated with material returning device 4.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, it also comprises material returning device 4, and the external circulation fluidized bed Heat Room 7 of external Double fluodized-bed heat exchanger 200 is communicated with material returning device 4.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, described in it, guide vane formula feed arrangement 21 comprises at least two group guide vanes 210, guide vane 210 each other parallel side-by-side and be close to inboard wall of burner hearth arrange, form elongate slot 211 between adjacent, parallel guide vane 210;
Elongate slot 211 is the passage of upper and lower two end openings, and its upper end is communicated with burner hearth 2, and lower end is communicated with ICFB Heat Room 9;
Clear distance d≤40mm between two groups of adjacent, parallel guide vanes 210, feed arrangement 21 upper surface BC projector distance L is in the horizontal direction 1/8 ~ 3/4 of ICFB Heat Room 9 width W, feed arrangement 21 upper surface BC and guide vane 210 by burner hearth sidewall to the downward-sloping setting of burner hearth center position, guide vane 210 tilt angle alpha is 10 ° ~ 30 °, and upper surface BC downtilt angles β is 10 ° ~ 45 °.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, external Double fluodized-bed heat exchanger 200 solid particle first outer circulation passage 8 top described in it or external circulation fluidized bed Heat Room 7 feed side external wall of upper portion have horizontally disposed crosswind pipe 6 ', bypass channel 11 is furnished with on external circulation fluidized bed Heat Room 7 top, by bypass channel 11, solid particle first outer circulation passage 8 is communicated with between ICFB Heat Room 9, bypass channel 11 cross sectional shape is circle hole shape, ellipse or slit shape, bypass channel 11 by material inlet M side direction material outlet N side to the setting that is inclined upwardly, angle of inclination δ is 5 ° ~ 20 °, lower surface, bypass channel 11 material outlet N side is connected with deflector or mozzle OP, material particles is dirty in ICFB Heat Room 9 in the guide effect of deflector or mozzle OP, bypass channel 11 material inlet M side centre-height and crosswind pipe 6 ' center remain on sustained height level.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, described in it, external Double fluodized-bed heat exchanger 200 external circulation fluidized bed Heat Room 7 top is communicated with ICFB Heat Room 9 by outer overfall 72, outer overfall 72 is arranged by external circulation fluidized bed Heat Room 7 side direction ICFB Heat Room 9 side direction surface thereof, outer overfall 72 is 10 ° ~ 30 ° with the angle of inclination of horizontal direction, and outer overfall 72 center and crosswind pipe 6 ' center remain on sustained height level.
The CFBB of the described external Double fluodized-bed heat exchanger of band close-coupled, the wall of external circulation fluidized bed Heat Room 7 described in it, ICFB Heat Room 9, solid particle first outer circulation passage 8 or solid particle second outer circulation passage 8 ' and solid particle inner cycle channel 10 is that water-cooled, vapour are cold, carbonated drink associating membrane wall or adiabatic fire-resistant lining.
Feature of the present invention is:
Compared with the prior art, the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled provided by the invention, in inciting somebody to action at burner hearth bottom, outer circulation external Double fluodized-bed heat exchanger and burner hearth carry out integrated design, do not adopt expansion joint, chamber structure is simplified with maintenance, all built-in fluid bed heat exchangers carry out the heat exchange power of fine adjustment fluid-bed heat exchanger by Fluidization wind rate, realize independent regulating and control function on demand, make full use of a large amount of adherent high-temperature particle stream of burner hearth emulsion zone, increase substantially the heat-exchange capacity of external fluid-bed heat exchanger under different load, solve the bed temperature under underload and steam temperature stable problem, meet more high-grade steam parameter requirement, adapt to growth requirement that is overcritical or ultra supercritical large circulating fluidized bed boiler technology.
Accompanying drawing explanation
Fig. 1 is the section front elevational schematic of the CFBB embodiment 1 of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 2 is the close-up schematic view of CFBB embodiment 1 burner hearth bottom of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 3 is the close-up schematic view of the guide vane formula feed arrangement 21 of the CFBB embodiment 1 of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 4 is the A-A sectional view of the CFBB embodiment 1 guide vane formula feed arrangement 21 of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 5 is the close-up schematic view of CFBB embodiment 2 burner hearth bottom of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 6 is the section front elevational schematic of the CFBB embodiment 3 of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 7 is the close-up schematic view of CFBB embodiment 3 bypass channel 11 of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention;
Fig. 8 is the close-up schematic view of CFBB embodiment 4 burner hearth bottom of the external Double fluodized-bed heat exchanger of band close-coupled of the present invention.
Detailed description of the invention
The know-why of the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled provided by the invention is as follows:
On the basis of routine single external external circulation fluidized bed heat exchanger, the most high heat flux of recirculating fluidized bed is utilized to appear at the feature of burner hearth bottom emulsion zone, add an external ICFB heat exchanger at burner hearth bottom emulsion zone, fully reclaimed a large amount of high-temperature particle stream heats flowed downward along inboard wall of burner hearth by external ICFB heat exchanger.Because the solid particle temperature entering fluid-bed heat exchanger from Inner eycle is higher than the outer circulation solid particle temperature separated from cyclone separator, thus enough large grain flux and sufficiently high article inlet temperature can be provided for ICFB heat exchanger, superheated steam and reheat steam temperature can be high as much as possible, the setting of two external fluid-bed heat exchanger simultaneously, add heat exchange area and the grain flux and the particle temperature that participate in heat exchange, thus significantly improve the heat-exchange capacity of different load fluidized bed at elevated heat exchanger, thus more high-grade steam parameter requirement can be met, particularly can meet growth requirement that is overcritical or ultra supercritical CFBB steam parameter.
An external ICFB Heat Room material material inlet is close to burner hearth emulsion zone inwall, be conducive to most a large amount of sticking wall flow particle heats reclaiming inboard wall of burner hearth like this, guide vane formula feed arrangement is adopted at ICFB Heat Room entrance, be conducive to sticking wall flow high-temperature particle enters Inner eycle external fluidized bed heat exchanger room smoothly under the guide functions of flight blade on the one hand, sticking wall flow high-temperature particle is avoided to enter outer circulation external fluidized bed heat exchanger room, affect particle flow and heat exchange, feed arrangement guide vane is in tilted layout to burner hearth center position by burner hearth sidewall, for making material particles charging smooth, blade pitch angle α is advisable with 10 ° ~ 30 °, by the spacing restriction of adjacent guide vanes, sorting is carried out to sticking wall flow bulky grain on the other hand, the spacing d of adjacent guide vanes is not more than 40mm, Inner eycle external fluidized bed heat exchanger room is entered to stop bulky grain, avoid the wearing and tearing that large granular materials inner loop external fluidized bed heat exchanger is restrained, ensure fluidization quality and the heat exchange efficiency of a material material in external ICFB Heat Room, the slightly downward-sloping layout in feed arrangement upper surface, for the bulky grain after ensureing sorting falls into burner hearth bottom from feed arrangement upper surface smoothly, upper surface downtilt angles β is advisable with 10 ° ~ 45 °, feed arrangement upper surface projector distance L is in the horizontal direction 1/8 ~ 3/4 of ICFB Heat Room width W, fully to reclaim the adherent grain flow heat of inboard wall of burner hearth.
By material shunting device, the high-temperature particle separated from cyclone separator is shunted: a part of high-temperature particle turns back to outer circulation external fluidized bed heat exchanger indoor by material shunting device and carries out heat exchange; Another part high-temperature particle is directly returned burner hearth by the overfall on material shunting device top or is turned back to Inner eycle external fluidized bed heat exchanger indoor by returning charge passage and carries out heat exchange, the high-temperature particle flow entering outer circulation external fluidized bed heat exchanger indoor is regulated by material shunting device, thus reach the heat exchange power regulating outer circulation external fluid-bed heat exchanger, to meet the heat exchange demand under different load.Between startup and low-load period, stop or reducing the fluidized wind that material shunting device returns to side, outer circulation external fluidized bed heat exchanger room, increase the fluidized wind directly returning to burner hearth or side, Inner eycle external fluidized bed heat exchanger room, high-temperature solid particle do not participated in or participates in the heat exchange of outer circulation external fluidized bed heat exchanger indoor less, thus ensureing to start and bed temperature stable between low-load period.When oepration at full load, material shunting device is stopped directly returning the fluidized wind of burner hearth or side, Inner eycle external fluidized bed heat exchanger room, what make outer circulation high temperature granular material all participate in outer circulation and Inner eycle external fluidized bed heat exchanger indoor changes exchange, to ensure the stable of steam temperature.By the input of material shunting device, solve the stable problem of steam temperature and bed temperature between startup and low-load period.
Between startup and low-load period, also the short circuit to outer circulation external fluidized bed heat exchanger room can ensure the stable of burner hearth bed temperature by bypass channel or overfall.Between startup and low-load period, stop the fluidized wind of outer circulation external fluidized bed heat exchanger indoor, simultaneously under sidewall horizontal wind action, directly enter Inner eycle external fluidized bed heat exchanger room from feeding-passage by bypass channel or overfall, make outer circulation high-temperature particle only participate in the heat exchange of Inner eycle external fluidized bed heat exchanger indoor or directly return burner hearth, thus ensure that burner hearth bed temperature maintains a higher level.Bypass channel or overfall adopt the arrangement that is inclined upwardly, and angle of inclination δ is advisable with 5 ° ~ 20 °, makes high-temperature particle only under sidewall horizontal wind action, just participate in short-circuit cycle.
External outer circulation and Inner eycle Double fluodized-bed heat exchanger and between solid particle circulation canal air compartment and burner hearth air compartment, adopt close-coupled arranged side by side to arrange, really realize the integrated design of external fluid-bed heat exchanger and burner hearth, thus eliminate external fluid-bed heat exchanger and be connected with the expansion joint between burner hearth, simplify chamber structure, save operation and maintenance cost.By the independent regulating and control of each air compartment fluidized wind, realize the independent regulating and control on demand of each Heat Room heat exchange power and the conveying of circulation canal solid particle.
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment 1
Referring to figs. 1 to Fig. 4, the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled provided by the invention, comprise air compartment 1, burner hearth 2, the cyclone separator 3 be connected with upper furnace exhanst gas outlet, the material returning device 4 of solid material carrying cyclone separator 3 to separate, the material shunting device 6 be connected with material returning device 4, with the external Double fluodized-bed heat exchanger 200 be connected bottom material shunting device 6 and burner hearth 2.Back-end ductwork is connected with the gas vent of cyclone separator 3, not shown in the drawings.
Material shunting device 6 is by feeding-passage 61 and the first returning charge passage 62, second returning charge passage 63 forms, first returning charge passage 62 is communicated with burner hearth 2 by overfall 23, second returning charge passage 63 is communicated with solid particle first outer circulation passage 8, external circulation fluidized bed Heat Room 7 is communicated with solid particle first outer circulation passage 8 by bottom through-hole 87, be communicated with ICFB Heat Room 9 by upper through-hole 79, ICFB Heat Room 9 is communicated with burner hearth 2 by the elongate slot 211 in top water conservancy diversion vane type feed arrangement 21, feed arrangement 21 adjacent guide vanes 210 spacing d is 30mm, guide vane 210 is 15 ° by burner hearth sidewall to burner hearth center position tilt angle alpha, feed arrangement upper surface BC downtilt angles β is 20 °, feed arrangement 21 projector distance L is in the horizontal direction 1/4 of ICFB Heat Room width W, ICFB Heat Room 9 is communicated with solid particle inner cycle channel 10 by bottom through-hole 92, solid particle inner cycle channel 10 is communicated with burner hearth 2 by overfall in top 22, burner hearth 2 air compartment 1 and external circulation fluidized bed Heat Room 7 air compartment 102, ICFB Heat Room 9 first class air compartment 101, solid particle first outer circulation passage 8, solid particle second outer circulation passage 8 ' and inner cycle channel 10 the 3rd fluidisation air compartment 103 and the 4th fluidisation air compartment 104 is compact is arranged in juxtaposition, external Double fluodized-bed heat exchanger 200 can be arranged symmetrically in bottom burner hearth about 2 side wall, also can be arranged in bottom burner hearth 2 lateral wall.
When boiler runs at full capacity, the high-temperature particle separated by cyclone separator 3 enters material shunting device 6 through material returning device 4, now, stop the wind transmission of material shunting device 6 burner hearth effluent, under high-temperature particle circulating fluidized bed heat exchanger effluent wind transmission effect outside, enter solid particle first outer circulation passage 8, enter in outer circulation external fluidized bed heat exchanger room 7 through the first outer circulation passage 8 bottom through-hole again and carry out heat exchange, solid particle after heat exchange enters in Inner eycle external fluidized bed heat exchanger room 9 through the overfall on top, outer circulation external fluidized bed heat exchanger room 7 and carries out heat exchange together with the Inner eycle high-temperature particle entered along feed arrangement 21 from inboard wall of burner hearth, the through hole of solid particle after heat exchange bottom ICFB Heat Room 9 enters inner cycle channel 10, in inner cycle channel 10 top, overfall 22 returns burner hearth 2 again.When boiler startup and underrun, stop the room 7 effluent wind transmission of material shunting device 6 external fluidized bed heat exchanger, start the wind transmission of burner hearth 2 effluent, make the heat exchange that high-temperature particle does not participate in external circulation fluidized bed Heat Room 7, directly return burner hearth 2 by the overfall 23 on material shunting device 6 top.
Embodiment 2
With reference to figure 5, the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled provided by the invention, its polycrystalline substance comprise the solid material that separates of conveying cyclone separator 3 material shunting device 6, respectively with the external fluid-bed heat exchanger 200 be connected bottom material shunting device 6 and burner hearth 2.Material shunting device 6 is by feeding-passage 61 and the first returning charge passage 62, second returning charge passage 63 forms, first returning charge passage 62 is communicated with ICFB Heat Room 9, second returning charge passage 63 is communicated with external circulation fluidized bed Heat Room 7, solid particle second outer circulation passage 8 ' is communicated with external circulation fluidized bed Heat Room 7 by bottom through-hole 78 ', be communicated with ICFB Heat Room 9 by upper through-hole 98 ', ICFB Heat Room 9 is communicated with burner hearth 2 by the elongate slot 211 in top water conservancy diversion vane type feed arrangement 21, feed arrangement 21 adjacent guide vanes 210 spacing d is the slit of 35mm, guide vane 210 is 20 ° by burner hearth sidewall to burner hearth center position tilt angle alpha, feed arrangement upper surface BC downtilt angles β is 20 °, feed arrangement 21 projector distance L is in the horizontal direction 1/4 of ICFB Heat Room 9 width W, ICFB Heat Room 9 is communicated with solid particle inner cycle channel 10 by bottom through-hole 92, solid particle inner cycle channel 10 is communicated with burner hearth 2 by overfall in top 22, interior overfall 22 to be inclined upwardly to burner hearth 2 direction layout by inner cycle channel 10, angle of inclination is 20 °, burner hearth 2 air compartment 1 and external circulation fluidized bed Heat Room 7 air compartment 102, ICFB Heat Room 9 first air compartment 101, solid particle first outer circulation passage 8, solid particle second outer circulation passage 8 ' air compartment 103 and inner cycle channel 10 air compartment 104 compact Layout arranged side by side.
When boiler startup and underrun, stop the wind transmission of external circulation fluidized bed Heat Room 7 effluent, starting the wind transmission of burner hearth 2 effluent, making the heat exchange that high-temperature particle does not participate in external circulation fluidized bed Heat Room 7, by returning burner hearth by inner cycle channel 10 again after heat exchange in ICFB Heat Room 9.
Embodiment 3
With reference to figure 6 and Fig. 7, the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled provided by the invention, comprises air compartment 1, burner hearth 2, the cyclone separator 3 be connected with upper furnace exhanst gas outlet, is connected external Double fluodized-bed heat exchanger 200 bottom cyclone separator 3 and burner hearth 2, cyclone separator 3 down-comer sidewall is furnished with crosswind pipe 6 ' and bypass channel 11.External circulation fluidized bed Heat Room 7 is communicated with the first outer circulation passage 8 by bottom through-hole 87, communicated with ICFB Heat Room 9 by upper through-hole 79, ICFB Heat Room 9 is communicated with burner hearth 2 by the elongate slot 211 in top water conservancy diversion vane type feed arrangement 21, guide vane formula feed arrangement 21 adjacent guide vanes 210 spacing d is the slit of 30mm, flight blade is 20 ° by burner hearth 2 sidewall to burner hearth 2 center position tilt angle alpha, feed arrangement upper surface BC downtilt angles β is 30 °, feed arrangement 21 upper surface projector distance L is in the horizontal direction 1/4 of ICFB Heat Room width W, solid particle inner cycle channel 10 is communicated with ICFB Heat Room 9 by bottom through-hole 92, be communicated with burner hearth 2 by overfall in top 22, crosswind pipe 6 ' is horizontally disposed, and bypass channel 11 to be inclined upwardly layouts to Way out N by a material material inlet M, and angle of inclination δ is 10 °, and crosswind pipe 6 ' central horizontal is arranged and highly expected that material inlet center remains on sustained height level with bypass channel 11, burner hearth 2 air compartment 1 and external circulation fluidized bed Heat Room 7 second wind transmission room 102, ICFB Heat Room first class air compartment 101, solid particle outer circulation the 3rd fluidisation air compartment 103 and inner cycle channel the 4th fluidisation air compartment 104 compact Layout side by side.
When boiler startup and underrun, stop the fluidized wind of solid particle first outer circulation passage 8 and external circulation fluidized bed Heat Room 7 side, start crosswind pipe 6 ' fluidized wind, make the heat exchange that high-temperature particle does not participate in external circulation fluidized bed Heat Room 7, under the effect of crosswind pipe 6 ' fluidized wind, directly turned back in ICFB Heat Room 9 by bypass channel 11 and carry out heat exchange.
Embodiment 4
With reference to figure 8, the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled provided by the invention, its polycrystalline substance comprise the solid material that separates of conveying cyclone separator 3 material returning device 4, connect external Double fluodized-bed heat exchanger 200 bottom material returning device 4 and burner hearth 2.Solid particle second outer circulation passage 8 ' is communicated with external circulation fluidized bed Heat Room 7 by overfall 72 outside bottom through-hole 78 ' and top, communicated with ICFB Heat Room 9 by upper through-hole 98 ', ICFB Heat Room 9 is communicated with burner hearth 2 by the elongate slot 211 in top water conservancy diversion vane type feed arrangement 21, feed arrangement 21 adjacent guide vanes 210 spacing d is the slit of 40mm, flight blade 210 is 15 ° by burner hearth 2 sidewall to burner hearth 2 center position tilt angle alpha, feed arrangement 21 upper surface BC downtilt angles β is 30 °, feed arrangement 21 projector distance L is in the horizontal direction 1/4 of ICFB Heat Room 9 width W, solid particle inner cycle channel 10 is communicated with ICFB Heat Room 9 by bottom through-hole 92, communicated with burner hearth 2 by overfall in top 22, crosswind pipe 6 ' is horizontally disposed, arranges that height remains on sustained height level with overfall 72 outside external circulation fluidized bed Heat Room 7 top, burner hearth 2 air compartment 1 and external circulation fluidized bed Heat Room 7 air compartment 102, ICFB Heat Room 9 first class air compartment 101, solid particle outer circulation passage the 3rd fluidisation air compartment 103 and inner cycle channel the 4th fluidisation air compartment 104 compact Layout side by side.
When boiler startup and underrun, stop the fluidized wind of solid particle first outer circulation passage 8 and external circulation fluidized bed Heat Room 7, start crosswind pipe 6 ' fluidized wind, directly turned back in ICFB Heat Room 9 by the outer overfall 72 on external circulation fluidized bed Heat Room 7 top and carry out heat exchange, after heat exchange, return burner hearth by inner cycle channel 10 again.
Claims (8)
1. the CFBB with the external Double fluodized-bed heat exchanger of close-coupled, comprise the burner hearth (2), cyclone separator (3) and the back-end ductwork that is connected with cyclone separator (3) exhanst gas outlet that connect successively, wherein burner hearth (2) bottom is provided with air compartment (1), it is characterized in that:
Also comprise at least one external Double fluodized-bed heat exchanger (200),
External Double fluodized-bed heat exchanger (200) is arranged in boiler hot Matter Transfer loop, comprising: an external circulation fluidized bed Heat Room (7), an ICFB Heat Room (9), solid particle first outer circulation passage (8) or solid particle second outer circulation passage (8 '), a solid particle inner cycle channel (10);
External circulation fluidized bed Heat Room (7) bottom is provided with heat exchanger second wind transmission room (102), is provided with heat exchanger (71) in it; ICFB Heat Room (9) bottom is provided with heat exchanger first class air compartment (101), is provided with heat exchanger (91) in it; Solid particle first outer circulation passage (8) or solid particle second outer circulation passage (8 ') bottom are provided with heat exchanger the 3rd fluidisation air compartment (103), and described internal solids recirculation passage (10) bottom is provided with heat exchanger the 4th fluidisation air compartment (104);
External circulation fluidized bed Heat Room (7) is communicated with solid particle first outer circulation passage (8) by bottom through-hole (87), or is communicated with solid particle second outer circulation passage (8 ') by the second bottom through-hole (78 ');
ICFB Heat Room (9) is by being communicated with between upper guide streaming blade feed arrangement (21) with burner hearth (2); And be communicated with external circulation fluidized bed Heat Room (7) by upper through-hole (79), or be communicated with solid particle second outer circulation passage (8 ') by upper through-hole (98 ');
Solid particle inner cycle channel (10) is communicated with ICFB Heat Room (9) by bottom through-hole (92), is communicated with burner hearth (2) by overfall in top (22);
Heat exchanger first class air compartment (101), heat exchanger second wind transmission room (102), heat exchanger the 3rd fluidisation air compartment (103), heat exchanger the 4th fluidisation air compartment (104) are close to burner hearth fluidisation air compartment (1) horizontal alignment and arrange.
2. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 1, it is characterized in that, described external Double fluodized-bed heat exchanger (200) also comprises a material shunting device (6), and material shunting device (6) comprises feeding-passage (61), the first returning charge passage (62) and the second returning charge passage (63); Feeding-passage (61) is communicated with the first returning charge passage (62) by bottom through-hole, be communicated with the second returning charge passage (63) by upper through-hole, feeding-passage (61) top is communicated with cyclone separator (3) solid outlet, first returning charge passage (62) is communicated with burner hearth (2) or ICFB Heat Room (9) by top overflow through hole (23), and the second returning charge passage (63) is communicated with between external circulation fluidized bed Heat Room (7) or solid particle first outer circulation passage (8).
3. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 2, it is characterized in that, also comprise material returning device (4), feeding-passage (61) top of the material shunting device (6) of described external Double fluodized-bed heat exchanger (200) is communicated with material returning device (4).
4. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 2, it is characterized in that, also comprise material returning device (4), the external circulation fluidized bed Heat Room (7) of external Double fluodized-bed heat exchanger (200) is communicated with material returning device (4).
5. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 1, it is characterized in that, described guide vane formula feed arrangement (21) comprises at least two group guide vanes (210), guide vane (210) each other parallel side-by-side and be close to inboard wall of burner hearth arrange, form elongate slot (211) between adjacent, parallel guide vane (210);
Elongate slot (211) is communicated with burner hearth (2) for the passage of upper and lower two end openings, its upper end, and lower end is communicated with ICFB Heat Room (9);
Clear distance d≤40mm between two groups of adjacent, parallel guide vanes (210), feed arrangement (21) upper surface BC projector distance L is in the horizontal direction 1/8 ~ 3/4 of ICFB Heat Room (9) width W, feed arrangement (21) upper surface BC and guide vane (210) by burner hearth sidewall to the downward-sloping setting of burner hearth center position, guide vane (210) tilt angle alpha is 10 ° ~ 30 °, and upper surface BC downtilt angles β is 10 ° ~ 45 °.
6. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 1, it is characterized in that, described external Double fluodized-bed heat exchanger (200) solid particle first outer circulation passage (8) top or external circulation fluidized bed Heat Room (7) feed side external wall of upper portion have horizontally disposed crosswind pipe (6 '), bypass channel (11) is furnished with on external circulation fluidized bed Heat Room (7) top, be communicated with between solid particle first outer circulation passage (8) with ICFB Heat Room (9) by bypass channel (11), bypass channel (11) cross sectional shape is circle hole shape, ellipse or slit shape, bypass channel (11) by material inlet M side direction material outlet N side to the setting that is inclined upwardly, angle of inclination δ is 5 ° ~ 20 °, lower surface, bypass channel (11) material outlet N side is connected with deflector or mozzle OP, material particles is dirty in ICFB Heat Room (9) in the guide effect of deflector or mozzle OP, bypass channel (11) material inlet M side centre-height and crosswind pipe (6 ') center remain on sustained height level.
7. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 6, it is characterized in that, described external Double fluodized-bed heat exchanger (200) external circulation fluidized bed Heat Room (7) top is communicated with ICFB Heat Room (9) by outer overfall (72), outer overfall (72) is arranged by external circulation fluidized bed Heat Room (7) side direction ICFB Heat Room (9) side direction surface thereof, outer overfall (72) is 10 ° ~ 30 ° with the angle of inclination of horizontal direction, outer overfall (72) center and crosswind pipe (6 ') center remain on sustained height level.
8. by the CFBB of the external Double fluodized-bed heat exchanger of band close-coupled according to claim 1, it is characterized in that, the wall of described external circulation fluidized bed Heat Room (7), ICFB Heat Room (9), solid particle first outer circulation passage (8) or solid particle second outer circulation passage (8 ') and solid particle inner cycle channel (10) is that water-cooled, vapour are cold, carbonated drink associating membrane wall or adiabatic fire-resistant lining.
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| CN201110170116.6A CN102840577B (en) | 2011-06-23 | 2011-06-23 | Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger |
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| CN201110170116.6A CN102840577B (en) | 2011-06-23 | 2011-06-23 | Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger |
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| CN102840577B true CN102840577B (en) | 2015-03-25 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RS56057B1 (en) * | 2013-12-16 | 2017-09-29 | Doosan Lentjes Gmbh | Fluidized bed apparatus with a fluidized bed heat exchanger |
| EP2884169B1 (en) * | 2013-12-16 | 2016-07-27 | Doosan Lentjes GmbH | Fluidized bed apparatus |
| CN103672875A (en) * | 2013-12-17 | 2014-03-26 | 东方电气集团东方锅炉股份有限公司 | External heat exchanger |
| CN105276575A (en) * | 2014-06-12 | 2016-01-27 | 国网山西省电力公司电力科学研究院 | Boiler heating system |
| CN106838889B (en) * | 2017-02-09 | 2019-09-27 | 重庆大学 | A kind of circulating fluidized bed boiler of the interior circulation ash heat exchanger of band |
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Inventor after: Song Guoliang Inventor after: Sun Yunkai Inventor after: Wang Xiaofang Inventor after: Wang Haigang Inventor after: Wang Dongyu Inventor after: Lv Qinggang Inventor after: Gao Ming Inventor before: Song Guoliang Inventor before: Sun Yunkai Inventor before: Zhang Man Inventor before: Wang Xiaofang Inventor before: Wang Haigang Inventor before: Wang Dongyu Inventor before: Lv Qinggang Inventor before: Gao Ming |
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