CN113983456A - CFB air distribution plate bell-type hood with adjustable resistance characteristic - Google Patents
CFB air distribution plate bell-type hood with adjustable resistance characteristic Download PDFInfo
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- CN113983456A CN113983456A CN202111461826.4A CN202111461826A CN113983456A CN 113983456 A CN113983456 A CN 113983456A CN 202111461826 A CN202111461826 A CN 202111461826A CN 113983456 A CN113983456 A CN 113983456A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
The invention discloses a CFB wind distribution plate bell-type hood with adjustable resistance characteristics, which comprises a hood inner core, wherein the top end of the hood inner core is inserted into a hood outer cover from the bottom end of the hood outer cover, a plurality of hood outer cover small holes are formed in the side wall of the bottom end of the hood outer cover, the top of the hood inner core is of a conical structure, a hood inner core top small hole is formed in the center of the top of the hood inner core, a plurality of spacing modules with uniform intervals are arranged at the top of the hood inner core, a plurality of rows of hood inner core small holes are formed in the lower side of the conical structure of the hood inner core, a hood resistance adjusting slide block is covered on the top end of the hood inner core, the inner side of the hood resistance adjusting slide block is of a pointed cone structure or a hemispherical structure and is inserted into the hood inner core top small holes, and the side wall of the hood resistance adjusting slide block is arranged between the hood outer cover and the hood inner core. The bell-type hood solves the problems that the bed layer of the circulating fluidized bed is easy to have uneven and unstable fluidization under low load, so that coking, hood burning and the like are easy to occur in a hearth.
Description
Technical Field
The invention relates to the technical field of circulating fluidized bed power generation, in particular to a CFB air distribution plate bell-type hood with adjustable resistance characteristics.
Background
The circulating fluidized bed boiler (CFB) combustion technology is a new clean coal combustion technology developed in the early 70 s internationally, and is more and more widely applied to the industries of electric power, heat supply chemical production and the like due to the characteristics of wide fuel adaptability, good load regulation performance, large regulation range, superior environmental protection indexes and the like. The air distribution plate and the air cap thereof are important combustion devices of the circulating fluidized bed boiler, and the design quality of the air distribution plate is closely related to the flowing, combustion and heat transfer processes in a hearth. Therefore, the blast cap structure with excellent design should meet the requirements of ensuring uniform fluidization; secondly, the resistance is moderate; and slight abrasion.
At present, circulating fluidized bed boilers are rapidly developing towards large-scale, high-parameter and supercritical (supercritical) directions, and the air distribution uniformity on the air distribution plate becomes more important along with the continuous increase of the boiler capacity. The hood is an important component of the air distribution plate, and the resistance characteristic of the hood determines the resistance characteristic of the air distribution plate in a certain installation mode. With the development of the circulating fluidized bed boiler, the bell-type hood has the advantages of good fluidization effect, difficult slag leakage, good resistance and the like due to the unique structure, and is widely used in various domestic large circulating fluidized bed power stations. On the other hand, in recent years, the installed capacity of renewable energy power generation is increased year by year and the running has strong randomness, so in order to promote the development of renewable energy, a higher peak regulation requirement is put forward to a coal-fired boiler unit in China, and part of boilers are required to realize stable combustion under low load frequently or for a long time. When the circulating fluidized bed boiler operates at low load, the resistance of a material layer is increased along with the reduction of the fluidized air quantity, on the contrary, the pressure drop of the air distribution plate is reduced along with the reduction of the fluidized air quantity, the pressure drop of the air distribution plate accounts for less than 20 percent of the total pressure drop (the resistance of the material layer and the pressure drop of the air distribution plate) of the whole bed layer, and the stable operation of the bed layer can be maintained only when the pressure drop of the air distribution plate is 25 to 30 percent of the resistance of the whole bed layer according to a large amount of operation experience. Operation practice shows that the bed layer is easy to have the phenomena of uneven and unstable fluidization under low load, so that the phenomena of coking, burning-out of blast caps and the like are easy to occur in a hearth.
Therefore, there is a need for a CFB wind distribution plate bell hood with adjustable resistance characteristics to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem that the problems of coking, hood burning and the like easily occur in a hearth due to the fact that a circulating fluidized bed layer is easy to have uneven and unstable fluidization under low load, and provides a CFB air distribution plate bell-type hood with adjustable resistance characteristics.
In order to solve the above technical problem, an embodiment of the present invention provides a CFB air distributor bell jar hood with adjustable resistance characteristics, where the CFB air distributor bell jar hood with adjustable resistance characteristics includes: the top end of the hood inner core is inserted into the hood outer cover from the bottom end of the hood outer cover, a plurality of hood outer cover small holes 2 are formed in the side wall of the bottom end of the hood outer cover, the top of the hood inner core is of a conical structure, a plurality of hood inner core top small holes are formed in the center of the top of the hood inner core, a plurality of spacing modules with uniform intervals are arranged at the top of the hood inner core, a plurality of rows of hood inner core small holes are formed in the lower side of the conical structure of the hood inner core, the side wall of the hood outer cover is thickened from the top end of the highest row of hood inner core small holes to the top of the hood outer cover corresponding to the highest row of hood inner core small holes, the hood resistance adjusting sliding block is covered on the top end of the hood inner core, the inner side of the center of the hood resistance adjusting sliding block is arranged in a pointed cone structure or a hemispherical structure and inserted into the small holes in the top of the hood inner core, the side wall of the hood resistance adjusting sliding block is arranged between the hood outer cover and the hood inner core, and at most, the rest of the exhaust hood inner core pores except the bottom row of the exhaust hood inner core pores are covered, a sliding block annular gap is formed between the exhaust hood resistance adjusting sliding block and the exhaust hood inner core, and an exhaust hood annular gap is formed among the exhaust hood outer cover, the exhaust hood inner core and the exhaust hood resistance adjusting sliding block and is communicated with the sliding block annular gap.
Wherein, the blast cap dustcoat aperture number is 8 ~ 16, evenly divide at the interval and locate on the lateral wall of blast cap dustcoat, and the area of every blast cap dustcoat aperture is 200 ~ 600mm2。
Wherein the diameter of the small hole of the inner core of the blast cap is
The number of the blast cap inner core holes is 30-80, the blast cap inner core holes in each row are distributed on the blast cap inner core at equal intervals along the circumferential direction, and the blast cap inner core holes in two adjacent rows are arranged in staggered rows in a crossed manner.
Wherein, the inner diameter of the thickened section of the hood outer cover is 0.5-2mmm larger than the outer diameter of the hood resistance adjusting slide block, and the uniform thickness of the rest parts of the hood outer cover except the thickened section is 5-15 mm.
Wherein, the side wall of the conical section of the conical structure at the top of the inner core of the hood is a straight line or a curve, the inclination angle of the conical section is 0-60 degrees from the vertical direction, and the area of the small hole at the top of the inner core of the hood is 0.5-20 cm2。
The inner top end of the air cap resistance adjusting sliding block is arranged to be of a conical structure, the center of the top end of the air cap resistance adjusting sliding block is arranged to be of a pointed cone structure or a hemispherical structure, and the inner diameter of the conical section of the conical structure of the air cap resistance adjusting sliding block is not smaller than the outer diameter of the conical section of the top of the air cap inner core.
The thickness of the rest part of the air cap resistance adjusting sliding block except the conical section is 3-10 mm, the inner diameter of the air cap resistance adjusting sliding block is larger than the outer diameter of the rest part of the air cap inner core except the conical section by 1-5 mm, and the surface roughness of the air cap resistance adjusting sliding block at least meets Ra3.2.
The sliding block annular gap comprises a horizontal and inclined gap between the inner wall of the air cap resistance adjusting sliding block and the outer wall of the air cap inner core.
The limiting module is arranged on the top of the inner core of the hood in a threaded connection, welding or embedding manner; the pointed cone structure of the air cap resistance adjusting sliding block is a smooth cone with the downward direction, and the outer diameter of the pointed cone at the top height of the air cap inner core is not larger than the diameter of the small hole at the top of the air cap inner core.
The embodiment of the invention has the following beneficial effects:
the CFB air distribution plate bell-type hood with adjustable resistance characteristics can effectively improve the phenomena of uneven fluidization and instability during low-load operation of the boiler, maintain the long-term stable operation of the CFB boiler under low load, and reduce the cost of maintaining the stability of the air distribution plate by increasing the air volume during low-load operation in the prior art; in addition, even and stable fluidization is realized at low load, and the abrasion of the hood can be reduced, so that the maintenance cost of the boiler is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic perspective structural view of a CFB air distributor bell hood with adjustable resistance characteristics according to the present invention;
FIG. 2 is a top view of a CFB air distribution plate bell hood with adjustable resistance characteristics according to the present invention;
FIG. 3 is a front view of a CFB air distribution plate bell hood with adjustable resistance characteristics according to the present invention;
FIG. 4 is a side view of a CFB air distribution plate bell hood with adjustable resistance characteristics according to the present invention;
FIG. 5 is a cross-sectional view A-A of FIG. 3;
FIG. 6 is a cross-sectional view B-B of FIG. 3;
FIG. 7 is a cross-sectional view C-C of FIG. 4;
fig. 8 is a cross-sectional view taken along line D-D of fig. 4.
In the figure: the wind cap comprises a wind cap outer cover 1, a wind cap outer cover small hole 2, a wind cap inner core 3, a wind cap inner core small hole 4, a wind cap annular seam 5, a wind cap resistance adjusting slide block 6, a wind cap inner core top small hole 7, a thickening section 8, a wind cap inner core top conical structure 9, a slide block annular gap 10, a conical structure 11, a limiting module 12 and a pointed conical structure 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, fig. 1 is a schematic perspective view of a CFB air distributor bell hood with adjustable resistance characteristics according to the present invention; FIG. 2 is a top view of a CFB air distribution plate bell hood with adjustable resistance characteristics according to the present invention; FIG. 3 is a front view of a CFB air distribution plate bell hood with adjustable resistance characteristics according to the present invention; FIG. 4 is a side view of a CFB air distribution plate bell hood with adjustable resistance characteristics according to the present invention; FIG. 5 is a cross-sectional view A-A of FIG. 3; FIG. 6 is a cross-sectional view B-B of FIG. 3; FIG. 7 is a cross-sectional view C-C of FIG. 4; fig. 8 is a cross-sectional view taken along line D-D of fig. 4.
This CFB air distributor bell jar hood that resistance characteristic is adjustable includes: the wind cap comprises a wind cap outer cover 1, a wind cap inner core 3, a wind cap resistance adjusting slide block 6 and a limiting module 12.
The top end of the blast cap inner core 3 is inserted into the blast cap outer cover 1 from the bottom end of the blast cap outer cover 1, and a plurality of blast cap outer cover small holes 2 are formed in the side wall of the bottom end of the blast cap outer cover 1.
The top of the blast cap inner core 3 is of a conical structure, the top center of the blast cap inner core is provided with a blast cap inner core top small hole 7, and the top end of the blast cap inner core 3 around the blast cap inner core top small hole 7 is provided with a plurality of spacing modules 12 with uniform intervals, and the number of spacing modules is preferably 3. The limiting module 12 is installed on the top of the inner core 3 of the hood in a threaded connection, welding or embedding mode. The lower side of the conical structure of the blast cap inner core 3 is provided with a plurality of rows of blast cap inner core small holes 4.
The side wall of the hood outer cover 1 is thickened from the top of the highest hood inner core pore 4 of the hood inner core 3 to the top of the hood outer cover 1. The hood resistance adjusting slide block 6 is covered on the top end of the hood inner core 3, and the inner side of the center of the hood resistance adjusting slide block is provided with a pointed cone structure 13 (which can also be a hemispherical structure or other insertable structures) which is inserted into a small hole 7 at the top of the hood inner core. The side wall of the hood resistance adjusting slide block 6 is arranged between the hood outer cover 1 and the hood inner core 3 and covers at most the rest of the exhaust hood inner core small holes 4 except the hood inner core small holes 4 at the bottom row.
The pointed cone structure 13 of the wind cap resistance adjusting slide block 6 is a smooth cone with a downward direction, and the outer diameter of the pointed cone at the top height of the wind cap inner core 3 is not larger than the diameter of the small hole 7 at the top of the wind cap inner core. A sliding block annular gap 10 is formed between the air cap resistance adjusting sliding block 6 and the air cap inner core 3, and comprises a horizontal and inclined gap between the inner wall of the air cap resistance adjusting sliding block 6 and the outer wall of the air cap inner core 3. An air cap annular gap 5 is formed among the air cap outer cover 1, the air cap inner core 3 and the air cap resistance adjusting slide block 6 and is communicated with a slide block annular gap 10.
In this embodiment, 2 numbers of hood dustcoat apertures are 8 ~ 16, and the interval is evenly divided and is located on the lateral wall of hood dustcoat 1, and the area of every hood dustcoat aperture 2 is 200 ~ 600mm2. The diameter of the small hole 4 of the inner core of the wind cap is
The number of the blast cap inner core holes is 30-80, the blast cap inner core holes 4 in each row are distributed on the blast cap inner core 3 at equal intervals along the circumferential direction, and the blast cap inner core holes 4 in two adjacent rows are arranged in staggered rows in a crossed manner. The inner diameter of the thickened section 8 of the hood outer cover 1 is 0.5-2mmm larger than the outer diameter of the hood resistance adjusting slide block 6, and the uniform thickness of the rest parts of the hood outer cover 1 except the thickened section 8 is 5-15 mm. The side wall of the conical section of the conical structure 9 at the top of the inner core of the hood is a straight line, a curve or other lines, the inclination angle of the conical section is 0-60 degrees with the vertical direction, and the area of the small hole 7 at the top of the inner core of the hood is 0.5-20 cm2. The top end of the inner part of the wind cap resistance adjusting sliding block 6 is arranged to be a conical structure 11, and the center of the top end is arranged to be sharpThe inner diameter of the conical section of the conical structure 11 of the air cap resistance adjusting slide block 6 is not less than the outer diameter of the conical section of the conical structure 9 at the top of the air cap inner core. The rest parts of the air cap resistance adjusting sliding block 6 except the conical section are 3-10 mm thick, the inner diameter of the air cap resistance adjusting sliding block is larger than the outer diameter of the rest parts of the air cap inner core 3 except the conical section by 1-5 mm, and the surface roughness of the air cap resistance adjusting sliding block 6 at least meets Ra3.2.
The invention aims to change the resistance characteristic of a bell-type hood under the low-load operation of a circulating fluidized bed boiler, increase the pressure drop of an air distribution plate under the low-load operation of the circulating fluidized bed boiler and improve the phenomena of uneven and unstable fluidization of the air distribution plate under the low fluidization air quantity. In order to achieve the purpose, the CFB air distribution plate bell-type hood with adjustable resistance characteristics is invented. The bell-type hood is additionally provided with a resistance adjusting slide block device on the common bell-type hood structure, the resistance adjusting slide block device is arranged outside an inner core of the bell-type hood to block partial inner core pores, and the structure of the inner core of the hood and the outer cover of the hood of the common bell-type hood is correspondingly improved. The top of the inner core of the hood is provided with a small hole and a conical section, and then the outer cover of the bell-type hood with the thickened section is arranged outside the inner core of the hood and the resistance adjusting slide block. The whole bell-type hood is made of a high-strength hard material which is fire-resistant, high-temperature resistant and wear-resistant, and the wall surface of the bell-type hood is polished to be smooth.
Based on the structure of a typical bell-type hood, the rows of small holes of the inner core of the hood are increased in the vertical direction, the number of each row is reduced, and the variation range of the resistance characteristic is increased; determining a structure of the air cap resistance adjusting sliding block according to the positions of the conical section, the outer diameter, the small hole at the top and the small hole of the inner core of the air cap; finally, processing the thickening section of the hood outer cover; the upper corner of the outer wall of the air cap resistance adjusting sliding block can be smoothly polished to perform chamfering treatment, friction between the upper corner and an outer hood of the air cap is reduced, and flexibility of self movement is improved. When the circulating fluidized bed boiler operates, fluidized air enters from the bell-type hood inner core, mainly flows through the hood annular seam through the hood inner core small holes, and finally flows out from the hood outer cover to fluidize bed layer particles. Under different fluidization air quantities, the fluidization air has different air speeds in the hood, and a small part of the air can enter between the hood resistance adjusting slide block and the hood inner core through the small hole at the top of the hood inner core and then enters into the hood annular gap after passing through the slide block annular gap. The small part of wind enables the hood resistance adjusting slide block to bear upward pressure which changes due to height, when the differential pressure between the part of wind and the pressure borne by the upper surface is equal to the gravity of the hood resistance adjusting slide block, the wind cap resistance adjusting slide block is stabilized at the height, and the current hood resistance characteristic is determined. When low-load or no load, the height of hood resistance adjustment slider is in the lowest position, and the vertical height of slider can be stabilized to spacing module, and the horizontal position of slider can be stabilized to hood resistance adjustment slider pointed cone to can effectively avoid the dead condition of hood resistance adjustment slider and hood inner core card.
The principle and the working process of the invention are as follows:
according to a great amount of previous researches, the resistance pressure drop of the bell-type hood is approximately in a linear relation (delta P is xi Qm) with the fluidization air volume, namely the resistance pressure drop of the bell-type hood is linearly increased with the fluidization air volume. The resistance characteristic (resistance coefficient xi) of the bell-type hood is determined by the number and the area of the small holes of the hood outer cover, the thickness and the length of the circular seam between the hood outer cover and the hood inner core, the number and the area of the small holes of the hood inner core, the physical property of fluidized wind and the like, but the total flow area (the number multiplied by the area of a single small hole) of the small holes of the hood inner core has the largest influence on the resistance characteristic of the hood among the influence factors. Therefore, in the invention, a resistance adjusting slide block is arranged outside the inner core of the blast cap, and the flowing area of the fluidized air of the small holes of the inner core of the blast cap is reduced by changing the height position of the resistance adjusting slide block under low load, thereby changing the resistance characteristic of the blast cap.
And in the working process of the hood resistance adjusting slide block, each height corresponds to different fluidization air quantity. After a small part of fluidized wind enters from a small hole at the top of the inner core of the wind cap and passes through the annular gap of the sliding block, the wind cap resistance adjusting sliding block generates differential pressure to form force for lifting the sliding block due to the pressure of the fluidized wind below the wind cap resistance adjusting sliding block, when the applied lifting force is larger than the self weight of the sliding block, the sliding block is lifted, the flow cross section of the fluidized wind in the annular gap of the sliding block is increased, the flow velocity of fluid at the annular gap is reduced, the differential pressure of the upper end and the lower end of the sliding block is reduced, the lifting force applied to the sliding block is reduced, and the sliding block is stabilized at a certain height until the lifting force is equal to the self weight of the sliding block. Meanwhile, in the operation process, when a small part of fluidized wind passes through the annular gap of the sliding block, a certain cooling effect can be achieved on the top of the hood outer cover, and the service life of the hood is prolonged.
Therefore, when the fluidizing air quantity is increased, the pressure below the slide block is increased, the rising force formed by differential pressure is increased, the slide block moves upwards, the circulation sectional area of the fluidizing air in the annular gap of the slide block is increased, the flow rate of fluid is reduced, the rising force is reduced until the weight of the slide block is equal to the self weight of the slide block, the small holes of the inner cores of the air hoods blocked in different quantities are displayed through different suspension heights of the slide block, so that the circulation area of the small holes of the inner cores of the air hoods is increased, the resistance characteristic of the air hoods is changed, and the resistance pressure drop of the air hoods of the single bell-type air hoods under high load is reduced. On the contrary, the fluidizing air is reduced in low load, the sliding block moves downwards and finally stabilizes at a certain height or the lowest point position, the number of the small holes of the inner core of the hood which can work is small, the total flow area of the small holes of the inner core of the hood is small, the resistance pressure drop of a single bell-type hood is greatly increased, and the pressure drop of the air distribution plate is increased, so that the aim of improving the fluidizing uniformity and stability of the air distribution plate in low load of the boiler is fulfilled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A CFB air distribution plate bell-type hood with adjustable resistance characteristics is characterized by comprising: the top end of the hood inner core is inserted into the hood outer cover from the bottom end of the hood outer cover, a plurality of hood outer cover small holes are formed in the side wall of the bottom end of the hood outer cover, the top of the hood inner core is of a conical structure, a hood inner core top small hole is formed in the center of the top of the hood inner core, a plurality of limiting modules with uniform intervals are arranged at the top of the hood inner core, a plurality of rows of hood inner core small holes are formed in the lower side of the conical structure of the hood inner core, the side wall of the hood outer cover corresponds to the highest row of the hood inner core small holes from the top end to the top of the hood outer cover and is thickened, the hood resistance adjusting slider covers the top end of the hood inner core, the inner side of the center of the hood resistance adjusting slider is of a pointed cone structure or a hemispherical structure and is inserted into the hood inner core top small hole, the lateral wall of hood resistance adjustment slider set up in the hood dustcoat with between the hood inner core, and cover many remaining hood inner core apertures of airing exhaust except the hood inner core aperture of bottom row at most, hood resistance adjustment slider with form the slider annular gap between the hood inner core, the hood dustcoat, the hood inner core and form the hood annular gap between the hood resistance adjustment slider, communicate with the slider annular gap.
2. The CFB air distribution plate bell-type hood with adjustable resistance characteristics according to claim 1, wherein the number of the hood outer cover small holes is 8-16, the air distribution plate small holes are evenly distributed on the side wall of the hood outer cover at intervals, and the area of each hood outer cover small hole is 200-600 mm2。
3. The CFB grid plate bell style hood with adjustable resistance characteristics of claim 1, wherein said hood core apertures have a diameter of
The number of the blast cap inner core holes is 30-80, the blast cap inner core holes are distributed in 3-10 rows, each row of the blast cap inner core holes are distributed on the blast cap inner core at equal intervals along the circumferential direction, and the blast cap inner core holes in two adjacent rows are arranged in staggered rows in a crossed mode.
4. The CFB air distribution plate bell type hood with adjustable resistance characteristics according to claim 1, wherein the inner diameter of the thickened section of the hood outer cover is 0.5-2mmm larger than the outer diameter of the hood resistance adjusting slide block, and the uniform thickness of the rest parts of the hood outer cover except the thickened section is 5-15 mm.
5. The CFB air distribution plate bell-type hood with adjustable resistance characteristics according to claim 1, wherein the side wall of the conical section of the conical structure at the top of the hood core is a straight line or a curve, the inclination angle of the conical section forms an included angle of 0-60 degrees with the vertical direction, and the area of the small hole at the top of the hood core is 0.5-20 cm2。
6. The CFB air distribution plate bell-type hood with adjustable resistance characteristics according to claim 1, wherein the inner top end of the hood resistance adjusting slide block is in a conical structure, the center of the top end is in a pointed cone structure or a hemispherical structure, and the inner diameter of the conical section of the conical structure of the hood resistance adjusting slide block is not smaller than the outer diameter of the conical section of the conical structure at the top of the hood inner core.
7. The CFB air distribution plate bell-type hood with adjustable resistance characteristics according to claim 7, wherein the rest part of the hood resistance adjusting slide block except the tapered section is 3-10 mm thick, the inner diameter of the hood resistance adjusting slide block is larger than the outer diameter of the rest part of the hood inner core except the tapered section by 1-5 mm, and the surface roughness of the hood resistance adjusting slide block at least meets Ra3.2.
8. The CFB grid bell style hood with adjustable resistance characteristics of claim 1, wherein said slider annulus comprises horizontal and angled clearances between the inner wall of the hood resistance adjustment slider and the outer wall of the hood core.
9. The CFB grid bell jar hood with adjustable resistance characteristics of claim 1, wherein the stop module is mounted on top of the hood core by screwing, welding or embedding; the tip cone structure of the air cap resistance adjusting sliding block is a smooth cone with the downward direction, and the outer diameter of the tip cone at the top height position of the air cap inner core is not larger than the diameter of the small hole in the top of the air cap inner core.
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| CN202111461826.4A CN113983456A (en) | 2021-12-02 | 2021-12-02 | CFB air distribution plate bell-type hood with adjustable resistance characteristic |
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| KR102153032B1 (en) * | 2019-11-13 | 2020-09-07 | 한전케이피에스 주식회사 | An air-nozzle of circulating fluidized bed boiler |
| CN110762519A (en) * | 2019-11-18 | 2020-02-07 | 中国华能集团清洁能源技术研究院有限公司 | Resistance adjustable circulating fluidized bed boiler hood |
| CN113137599A (en) * | 2020-01-17 | 2021-07-20 | 北京航天石化技术装备工程有限公司 | Fluidized bed hood capable of automatically adjusting resistance drop |
| CN111336505A (en) * | 2020-04-03 | 2020-06-26 | 中国华能集团清洁能源技术研究院有限公司 | Variable-resistance energy-saving hood |
| CN215294895U (en) * | 2020-11-26 | 2021-12-24 | 大唐武安发电有限公司 | Resistance self-adaptive CFB air distribution plate bell-type hood structure |
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