CN108343948B - Beam type air distribution slag discharging device for circulating fluidized bed boiler - Google Patents
Beam type air distribution slag discharging device for circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN108343948B CN108343948B CN201810282014.5A CN201810282014A CN108343948B CN 108343948 B CN108343948 B CN 108343948B CN 201810282014 A CN201810282014 A CN 201810282014A CN 108343948 B CN108343948 B CN 108343948B
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- air
- air distribution
- slag
- fluidized bed
- circulating fluidized
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- 238000009826 distribution Methods 0.000 title claims abstract description 62
- 239000002893 slag Substances 0.000 title claims abstract description 56
- 238000007599 discharging Methods 0.000 title claims description 16
- 239000002956 ash Substances 0.000 claims description 27
- 239000010884 boiler slag Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 14
- 239000002028 Biomass Substances 0.000 description 7
- 238000005243 fluidization Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- F23C10/24—Devices for removal of material from the bed
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a beam type air distribution and slag discharge device of a circulating fluidized bed boiler, which comprises an air distribution beam, an air inlet pipe, an air box, an ash bucket and a primary air channel, wherein the beam type air distribution and slag discharge device of the circulating fluidized bed boiler is positioned below a hearth, the air distribution beam is positioned above the beam type air distribution and slag discharge device of the circulating fluidized bed boiler, the beam type air distribution and slag discharge device is connected with the air box through the air inlet pipe, the lower part of the air box is connected with the primary air channel, a slag chute is formed by every two middle spaces of the air box, and the lower part of the slag chute is connected with the ash bucket. The beam type air distribution and slag discharge device of the circulating fluidized bed boiler can enable air distribution plates to be uniform in air distribution, slag discharge is smooth, and air distribution plate resistance is reduced.
Description
Technical Field
The invention relates to the field of circulating fluidized bed boilers, in particular to a beam type wind distribution slag discharge device of a circulating fluidized bed boiler, which is applied to biomass and garbage power generation equipment.
Background
With the continuous rapid development of society, the world demand for energy is increasing, and fossil fuels have failed to meet the increasing energy demand. And, therefore, the development of renewable energy sources has become a focus of worldwide attention. The biomass fuel and garbage fuel power generation technology is applied in a large scale. Because biomass fuel and refuse fuel have the characteristics of various shapes, different sizes, multiple sundries and the like, when the fuel is burnt, the phenomena of sundry aggregation, coking of air distribution plates, blockage of slag dropping pipes and the like easily occur in the conventional circulating fluidized bed boiler, uneven bed temperature distribution, uneven fluidization, insufficient combustion, further the thermal efficiency of the boiler is reduced, and even the conditions of emergency shutdown of the boiler and the like occur.
The beam type air distribution slag discharging device of the circulating fluidized bed boiler is one of effective ways for solving the problems, is designed aiming at biomass fuel and garbage fuel, can fundamentally solve the problems of unsmooth slag discharging of the boiler, blockage of a slag discharging pipe and the like, is suitable for treating agricultural wastes and urban garbage, and has wide market application prospect.
Disclosure of Invention
The beam type air distribution slag discharging device of the circulating fluidized bed boiler can lead air distribution plates to be uniform, slag discharge to be smooth and air distribution plate resistance to be reduced.
The invention adopts the following technical scheme:
the utility model provides a circulating fluidized bed boiler beam type wind distribution sediment device, includes wind distribution roof beam, air-supply line, bellows, ash bucket, a wind channel, and circulating fluidized bed boiler beam type wind distribution sediment device is located the furnace below, and the wind distribution roof beam is located circulating fluidized bed boiler beam type wind distribution sediment device top links to each other with a plurality of bellows through the air-supply line, and the bellows below links to each other with a wind channel, and a plurality of bellows every two middle interval space constitutes a slag chute, and slag chute below links to each other with the ash bucket.
Preferably, the wind distribution beams are arranged in the hearth in a segmented and parallel manner, the materials are cast steel, the arrangement quantity is determined by a designer according to design parameters, the quantity is between ten and tens, the section shape of the wind distribution beams is trapezoid with narrow upper part and wide lower part, an included angle of 15-30 degrees is formed between a trapezoid inclined plane and the vertical direction, small holes are formed in the inclined plane, primary wind is sprayed out through fluidization of the small holes, and the primary wind is used as fluidization wind of a circulating fluidized bed boiler.
Preferably, the cross section of the upper part of the air box is trapezoid with a narrow upper part and a wide lower part, the trapezoid inclined plane and the vertical direction form an included angle of 15-30 degrees, a plurality of air boxes are arranged in the depth direction of the boiler according to the size and design parameters of the hearth, and the air boxes are integrated in the width direction of the boiler and are formed by splicing carbon steel plates. The surface of the material is laid with refractory wear-resistant castable, so that the material is prevented from being damaged by high temperature and is prevented from being worn by bed materials.
Preferably, the slag dropping groove is composed of a space formed between every two air boxes, and ash is introduced into the ash bucket below the slag dropping groove. The cross section of the slag drop groove is trapezoid with wide upper part and narrow lower part, the size of the narrowest part in the depth direction is 300-500 mm, the size in the width direction is the width clearance size of the hearth, and sundries with different shapes and sizes and clusters in the fuel are discharged from the slag drop space with a large-size cross section.
Preferably, the ash bucket is of an inverted triangle structure, an inclined plane of the ash bucket forms an included angle of 30-50 degrees with the vertical direction, the upper part of the ash bucket is connected with a slag falling groove formed by the air box, and the lower part of the ash bucket is connected with a boiler slag cooler and is used for discharging ash slag out of a hearth. The primary air sequentially passes through the primary air duct, the air box, the air inlet pipe and the air distribution beam and finally enters the hearth to be used as the primary air for fluidization required by the boiler.
The invention can be effectively applied to the circulating fluidized bed boiler for burning biomass fuel or garbage fuel, and compared with the traditional circulating fluidized bed boiler, the invention mainly has the following differences: first: hundreds of wind caps with complex structures are arranged on a wind distribution plate of a traditional circulating fluidized bed boiler, wind distribution beams (1) adopted by the invention are of a trapezoid structure, are uniformly distributed along the width of the boiler, the number of the wind distribution beams (1) of the boiler with the same capacity level is about twenty times that of the traditional wind caps according to the capacity of the boiler, primary wind is sprayed out from small holes on inclined planes at two sides of the wind distribution beams after passing through the inner space of the wind distribution beams, the flowing resistance of the primary wind can be obviously reduced, and the wind distribution is more uniform; second,: the slag discharging pipe of the traditional circulating fluidized bed boiler is generally formed by opening 2-3 holes on an air distribution plate, wherein the diameters of the holes are about phi 219mm, and the slag discharging groove (I) formed by the space between every two air boxes (3) thoroughly changes the form, wherein the minimum dimension of the slag discharging groove in the depth direction of the boiler is about 300-500 mm, and the dimension of the slag discharging groove in the width direction of the boiler is equivalent to the width of a hearth, so that a slag discharging space with a large cross section area is formed, and impurities with larger shape and dimension and clusters in biomass fuel or garbage fuel can be smoothly discharged without blocking the slag discharging pipe.
The beneficial effects of the invention are as follows: (1) The primary air fluidization resistance is reduced, the air distribution is more uniform, the pressure head of the primary air blower is reduced, the equipment investment cost is saved, the operation cost of the boiler is reduced, and the thermal efficiency of the power plant is improved. (2) The slag discharging space is increased, the problem of blocking of a slag discharging pipe is solved, and the long-term continuous and stable operation of the boiler is ensured. (3) The slag discharge space is composed of an air box which is of a steel plate structure, so that the manufacturing difficulty and the field installation difficulty of a factory are reduced, and the equipment investment cost can be effectively reduced. (4) The wind distribution beam has simple structure, less quantity and more convenient overhaul and maintenance.
Drawings
Fig. 1 is a front view of an example of the present invention.
Fig. 2 is a left side view of an example of the present invention.
Fig. 3 is a detailed view of the air distribution beam and the air inlet pipe.
In the figure, 1, an air distribution beam, 2, an air inlet pipe, 3, an air box, 4, an ash bucket, 5, a primary air channel, 6, a hearth, I and a slag chute.
Detailed Description
The technical scheme of the invention is further specifically described by the following specific embodiments with reference to the accompanying drawings:
examples: as shown in the accompanying drawings 1, 2 and 3, the beam type air distribution and slag discharge device of the circulating fluidized bed boiler comprises an air distribution beam 1, an air inlet pipe 2, an air box 3, an ash bucket 4 and a primary air duct 5, wherein the beam type air distribution and slag discharge device of the circulating fluidized bed boiler is positioned at the lower part of a boiler furnace 6, the air distribution plate consists of three air boxes 3, the three air boxes are connected with the upper air distribution beam 1 through the air inlet pipe 2, a group of air distribution devices are formed by the three air distribution beams 1 along the depth direction of the boiler, and thirteen groups of air distribution devices are uniformly arranged along the width direction of the boiler. The lower part of the bellows 3 is connected with a primary air duct 5. In the system, the space between every two air boxes 3 forms two slag falling grooves I, the lower parts of the slag falling grooves I are respectively connected with ash hoppers 4, and in the example, 4 ash hoppers are arranged in the hearth. In the system, the cross section of the bellows 3 is trapezoidal, is formed by splicing steel plates, is arranged along the width direction of the boiler, and the air inlet pipe 2 is arranged on the inclined plane of the bellows 3 and is used for supporting the air distribution beam 1 above and serving as a communicated air pipe. The cross section of the air distribution beam 1 is trapezoid, and small holes are formed in the inclined plane of the air distribution beam and serve as fluidized air outlets, and the effect of the air distribution beam is the same as that of a hood of a traditional circulating fluidized bed boiler.
When the boiler operates, primary air enters the air box 3 in 3 paths from the primary air channel 5 at the bottom of the boiler, then enters the air distribution beam 1 through the air inlet pipe 2, and enters the hearth from the small holes at the inclined surface of the air distribution beam to serve as boiler fluidization air. Compared with the traditional circulating fluidized bed boiler, the air distribution device has the advantages of reduced number, simple construction and simple air flow, so that the flow resistance of primary air is reduced, the resistance of an air distribution plate can be effectively reduced, the investment cost of a fan and the operation cost of the boiler are reduced, and the thermal efficiency of a power plant is improved. Ash slag generated by combustion enters 4 ash hoppers positioned at the bottom of a hearth through 2 slag dropping grooves I respectively, and then is discharged out of a boiler to enter a slag cooler. The smallest section size of the slag drop groove I is 300-500 mm, which is far larger than the slag drop pipe with the diameter phi 219mm of the traditional circulating fluidized bed boiler, so that ash can be smoothly discharged, and the slag drop groove I is particularly suitable for circulating fluidized bed boilers for burning biomass fuel or garbage fuel, and the situation of blocking of the slag drop pipe can not occur. Meanwhile, refractory castable is laid on the outer surface of the bellows 3 to prevent the air duct from being burnt out and worn by high-temperature ash, and meanwhile, the inner primary air is used for cooling, so that the device is protected from running safely.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (1)
1. The beam type air distribution and slag discharge device of the circulating fluidized bed boiler is characterized by comprising an air distribution beam (1), an air inlet pipe (2), an air box (3), an ash bucket (4) and a primary air duct (5), wherein the beam type air distribution and slag discharge device of the circulating fluidized bed boiler is positioned below a hearth (6), the air distribution beam (1) is positioned above the beam type air distribution and slag discharge device of the circulating fluidized bed boiler, the air distribution beam is connected with a plurality of air boxes (3) through the air inlet pipe (2), the lower parts of the air boxes (3) are connected with the primary air duct (5), a slag falling groove (I) is formed by the interval spaces between every two of the plurality of air boxes (3), and the lower parts of the slag falling grooves (I) are connected with the ash bucket (4);
the air distribution beam (1) is divided into a plurality of sections and is arranged in the hearth in parallel, the cross section of the air distribution beam (1) is trapezoid with the upper part narrow and the lower part wide, the inclined plane of the trapezoid forms an included angle of 15-30 degrees with the vertical direction, and small holes are formed in the inclined plane;
the cross section of the upper part of the bellows (3) is trapezoid with narrow upper part and wide lower part, and the inclined plane of the trapezoid forms an included angle of 15-30 degrees with the vertical direction;
the slag dropping grooves (I) are formed by spaces formed between every two of the air boxes (3), ash enters the ash hopper (4) below the slag dropping grooves from the ash hopper, the cross section of each slag dropping groove (I) is trapezoid with wide upper part and narrow lower part, and the size of the narrowest part in the depth direction is 300-500 mm;
the ash bucket (4) is of an inverted triangle structure, an inclined plane of the ash bucket forms an included angle of 30-50 degrees with the vertical direction, the upper part of the ash bucket is connected with a slag falling groove (I) formed by the air box (3), and the lower part of the ash bucket is connected with a boiler slag cooler and is used for discharging ash slag out of a hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810282014.5A CN108343948B (en) | 2018-04-02 | 2018-04-02 | Beam type air distribution slag discharging device for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810282014.5A CN108343948B (en) | 2018-04-02 | 2018-04-02 | Beam type air distribution slag discharging device for circulating fluidized bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108343948A CN108343948A (en) | 2018-07-31 |
| CN108343948B true CN108343948B (en) | 2023-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810282014.5A Active CN108343948B (en) | 2018-04-02 | 2018-04-02 | Beam type air distribution slag discharging device for circulating fluidized bed boiler |
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| Country | Link |
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| CN (1) | CN108343948B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020094224A1 (en) * | 2018-11-07 | 2020-05-14 | Sumitomo SHI FW Energia Oy | A combustor air bar grid for use within a fluidized bed reactor, and a fluidized bed reactor |
| CN111121008A (en) * | 2020-01-22 | 2020-05-08 | 杭州国祯伊泰克工程技术有限公司 | Air distribution device for biomass boiler |
| CN114151787B (en) * | 2021-12-17 | 2024-05-31 | 无锡华光环保能源集团股份有限公司 | Anti-blocking slag discharging structure of circulating fluidized bed boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203517778U (en) * | 2013-10-29 | 2014-04-02 | 冯长青 | Anti-blocking device of slag discharge pipe of circulating fluidized bed boiler |
| CN204901747U (en) * | 2015-03-24 | 2015-12-23 | 宁波悍马能源设备有限公司 | Fluidized bed cloth wind system all |
| CN106152119A (en) * | 2015-03-24 | 2016-11-23 | 宁波悍马能源设备有限公司 | A kind of fluid bed cloth wind system |
| CN107842850A (en) * | 2017-09-28 | 2018-03-27 | 青岛大学 | A kind of fluidized bed combustor |
| CN207999809U (en) * | 2018-04-02 | 2018-10-23 | 杭州锅炉集团股份有限公司 | Circulating fluidized bed boiler beam type cloth wind slag-draining device |
-
2018
- 2018-04-02 CN CN201810282014.5A patent/CN108343948B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203517778U (en) * | 2013-10-29 | 2014-04-02 | 冯长青 | Anti-blocking device of slag discharge pipe of circulating fluidized bed boiler |
| CN204901747U (en) * | 2015-03-24 | 2015-12-23 | 宁波悍马能源设备有限公司 | Fluidized bed cloth wind system all |
| CN106152119A (en) * | 2015-03-24 | 2016-11-23 | 宁波悍马能源设备有限公司 | A kind of fluid bed cloth wind system |
| CN107842850A (en) * | 2017-09-28 | 2018-03-27 | 青岛大学 | A kind of fluidized bed combustor |
| CN207999809U (en) * | 2018-04-02 | 2018-10-23 | 杭州锅炉集团股份有限公司 | Circulating fluidized bed boiler beam type cloth wind slag-draining device |
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| CN108343948A (en) | 2018-07-31 |
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Address after: 1216, danionggang Road, Jianggan District, Hangzhou City, Zhejiang Province, 310021 Applicant after: Xizi clean energy equipment manufacturing Co.,Ltd. Address before: 1216, danionggang Road, Jianggan District, Hangzhou City, Zhejiang Province, 310021 Applicant before: HANGZHOU BOILER GROUP Co.,Ltd. |
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