CN109631027B - Circulating fluidized bed boiler return ash conveying structure - Google Patents
Circulating fluidized bed boiler return ash conveying structure Download PDFInfo
- Publication number
- CN109631027B CN109631027B CN201910084474.1A CN201910084474A CN109631027B CN 109631027 B CN109631027 B CN 109631027B CN 201910084474 A CN201910084474 A CN 201910084474A CN 109631027 B CN109631027 B CN 109631027B
- Authority
- CN
- China
- Prior art keywords
- ash
- outlet
- tank
- tank body
- fluidized bed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002956 ash Substances 0.000 description 84
- 239000000571 coke Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012546 transfer Methods 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
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention relates to a circulating fluidized bed boiler returned ash conveying structure, which comprises a material returning device, wherein the lower part of the material returning device is connected with the inlet end of an ash cooling machine, and the outlet end of the ash cooling machine is connected with an ash tank; the ash tank comprises a tank body, an ash inlet is formed in one side of the tank body, a coarse ash outlet is formed in the lower portion of the tank body, and a fine ash outlet is formed in the upper portion of the tank body; the fine ash outlet is connected with an ash hopper at the outlet of the air preheater. And a lower gate valve is arranged on the coarse ash outlet. The automatic conveying device is simple in structure, automatic conveying of the returned ash can be completed without adding any power equipment, maintenance is quite simple, and the device is safe, reliable and practical. More importantly, the method completely solves the problem of difficult environmental protection during the transportation of the returned ash.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a circulating fluidized bed boiler return ash conveying structure.
Background
In the prior art, the circulating fluidized bed boiler is an environment-friendly boiler with high combustion efficiency, relatively low pollutant generation rate and easy control. Particularly, the low nitrogen and low bed pressure technology is produced, and the original emission concentration of nitrogen oxides is greatly reduced by improving the separation efficiency of the separator. However, after the efficiency of the separator is improved, the amount of returned ash is increased, so that the ash concentration and the differential pressure of the hearth are increased, the heat transfer coefficient of the hearth is increased, and the temperature of the flue gas of the hearth is reduced too much and deviates from the design value. At present, a general boiler factory requires users to manually discharge part of circulating ash in a material returning device, so that the amount of returned ash entering a hearth is reduced to improve the temperature of hearth smoke, ensure that fuel is combusted sufficiently and reduce the carbon content of slag and fly ash; in addition, after the temperature of the hearth flue gas is increased, the boiler shows better adaptability when the boiler burns fuel deviating from the designed fuel. There are 2 modes of discharging and returning ash, one is purely manual ash discharging, and the ash discharging is eliminated gradually because of great danger to life safety; the other is to use a cold ash machine to discharge ash, which not only reduces the operation danger of workers, but also recovers the heat of Wen Fanliao ash, so that the method is gradually favored by users. However, the ash from the ash cooler is particularly fine, and if exposed to air, a large amount of dust is generated, which severely pollutes the environment. Especially, the general users adopt the open belt conveying device, the conveying distance is long, the time is long, and a large amount of dust emission brings great influence to the body and mind of operators and the environment.
Disclosure of Invention
The invention aims to provide a circulating fluidized bed boiler returned ash conveying structure which can solve the problems, is quite simple in maintenance, and is safe, reliable and practical.
According to the technical scheme provided by the invention: the circulating fluidized bed boiler returned ash conveying structure comprises a material returning device, wherein the lower part of the material returning device is connected with the inlet end of an ash cooling machine, and the outlet end of the ash cooling machine is connected with an ash tank; the ash tank comprises a tank body, an ash inlet is formed in one side of the tank body, a coarse ash outlet is formed in the lower portion of the tank body, and a fine ash outlet is formed in the upper portion of the tank body; the fine ash outlet is connected with an ash hopper at the outlet of the air preheater.
As a further improvement of the invention, a lower gate valve is arranged on the coarse ash outlet.
As a further improvement of the invention, a gate valve is arranged on the fine ash outlet.
As a further improvement of the invention, the ash cooler, the ash tank, the lower gate valve, the upper gate valve and the ash hopper at the outlet of the air preheater are connected through pipeline welding.
As a further improvement of the invention, the ash can is a miniature ash can.
As a further development of the invention, the ash can may be manufactured from carbon steel or alloy steel.
As a further improvement of the present invention, the pipe diameter is not less than 133mm.
Compared with the prior art, the invention has the following advantages:
1. the invention has simple structure and small occupied space; the automatic conveying of the returned ash can be completed without adding any power equipment, and the automatic conveying device is quite simple in maintenance, safe and reliable in equipment and very practical. More importantly, the method completely solves the problem of difficult environmental protection during the transportation of the returned ash.
2. According to the invention, the ash tank is used as a device for separating coarse ash or small coke blocks from fine ash, so that the coarse ash or the small coke blocks sink at the bottom of the miniature ash tank and are discharged intermittently or continuously through the gate valve; the fine ash is sucked out by high negative pressure at the ash hopper at the outlet of the air preheater, so that the sealed automatic transportation of the fine ash is completed.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the ash can of the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
As shown in fig. 1-2: comprises a material returning device 1, an ash cooling machine 2, an ash tank 3, an ash inlet 3.1, a coarse ash outlet 3.2, a fine ash outlet 3.3, a tank body 3.4, a lower gate valve 4, an upper gate valve 5, an air preheater outlet ash bucket 6 and the like.
The invention discloses a circulating fluidized bed boiler returned ash conveying structure, which is shown in fig. 1, and comprises a returning device 1, wherein a separator is connected above the returning device 1, the lower part of the returning device 1 is connected with the inlet end of an ash cooling machine 2, the outlet end of the ash cooling machine 2 is connected with an ash inlet 3.1 of an ash tank 3 through a pipeline, as shown in fig. 2, the ash tank 3 comprises a tank body 3.4, one side of the tank body 3.4 is provided with the ash inlet 3.1, the lower part of the tank body 3.4 is provided with a coarse ash outlet 3.2, a lower gate valve 4 is arranged on the coarse ash outlet 3.2, coarse ash can be intermittently discharged when the coarse ash amount is small, and the opening of the gate valve 4 can be opened to be small when the coarse ash amount is large so as to facilitate continuous coarse ash discharge. The upper part of the tank body 3.4 is provided with a fine ash outlet 3.3, a gate valve 5 is arranged on the fine ash outlet 3.3, and the fine ash outlet 3.3 is connected with an ash hopper 6 at the outlet of the air preheater through a pipeline.
The ash tank 3 is a micro ash tank in this embodiment. The ash can 3 may be machined from carbon steel or alloy steel.
The ash cooling machine 2, the miniature ash tank 3, the lower gate valve 4, the upper gate valve 5 and the ash hopper 6 at the outlet of the air preheater are connected through pipeline welding, the pipeline adopts common or alloy steel pipes, and the diameter of the pipeline is not less than 133mm.
The working process of the invention is as follows: the device ingeniously utilizes the characteristic that the negative pressure at the ash hopper 6 at the outlet of the boiler air preheater can reach-3000 Pa when the circulating fluidized bed normally operates, and the micro ash tank 3 is used as a separating device of coarse ash or small coke blocks and fine ash, so that the coarse ash or small coke blocks are deposited at the bottom of the micro ash tank and are discharged intermittently or continuously by the lower gate valve 4; the fine ash is sucked out by high negative pressure at the ash hopper 6 at the outlet of the air preheater, so that the sealed automatic transportation of the fine ash is completed.
The automatic conveying device is simple in structure, automatic conveying of the returned ash can be completed without adding any power equipment, maintenance is quite simple, and the device is safe, reliable and practical. More importantly, the method completely solves the problem of difficult environmental protection during the transportation of the returned ash.
Claims (3)
1. The utility model provides a circulating fluidized bed boiler return ash conveying structure which characterized in that: the structure comprises a returning device (1), wherein the lower part of the returning device (1) is connected with the inlet end of an ash cooling machine (2), and the outlet end of the ash cooling machine (2) is connected with an ash tank (3); the ash tank (3) comprises a tank body (3.4), an ash inlet (3.1) is formed in one side of the tank body (3.4), a coarse ash outlet (3.2) is formed in the lower portion of the tank body (3.4), and a fine ash outlet (3.3) is formed in the upper portion of the tank body (3.4); the fine ash outlet (3.3) is connected with an ash hopper (6) at the outlet of the air preheater; a lower gate valve (4) is arranged on the coarse ash outlet (3.2); a gate valve (5) is arranged on the fine ash outlet (3.3); the ash cooling machine (2), the ash tank (3), the lower gate valve (4), the upper gate valve (5) and the ash hopper (6) at the outlet of the air preheater are connected through pipeline welding; the ash tank (3) is a miniature ash tank.
2. The circulating fluidized bed boiler return ash conveying structure of claim 1, wherein: the ash can (3) can be processed from carbon steel or alloy steel.
3. The circulating fluidized bed boiler return ash conveying structure of claim 1, wherein: the diameter of the pipeline is not smaller than 133mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910084474.1A CN109631027B (en) | 2019-01-29 | 2019-01-29 | Circulating fluidized bed boiler return ash conveying structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910084474.1A CN109631027B (en) | 2019-01-29 | 2019-01-29 | Circulating fluidized bed boiler return ash conveying structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109631027A CN109631027A (en) | 2019-04-16 |
| CN109631027B true CN109631027B (en) | 2024-05-17 |
Family
ID=66064138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910084474.1A Active CN109631027B (en) | 2019-01-29 | 2019-01-29 | Circulating fluidized bed boiler return ash conveying structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109631027B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06307606A (en) * | 1993-04-23 | 1994-11-01 | Ishikawajima Harima Heavy Ind Co Ltd | Grain size classifying-type ash recirculation device |
| CN104990071A (en) * | 2015-05-22 | 2015-10-21 | 四川省宜宾惠美线业有限责任公司 | Circulating fluidized bed boiler capable of adjusting circulating ash flow |
| CN206608948U (en) * | 2017-03-30 | 2017-11-03 | 德清县中能热电有限公司 | Environment-friendly type fluidized-bed combustion boiler |
| CN209763052U (en) * | 2019-01-29 | 2019-12-10 | 无锡华光工业锅炉有限公司 | Circulating fluidized bed boiler return ash conveying structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9192889B2 (en) * | 2007-09-13 | 2015-11-24 | The Babcock & Wilcox Company | Bottom ash injection for enhancing spray dryer absorber performance |
-
2019
- 2019-01-29 CN CN201910084474.1A patent/CN109631027B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06307606A (en) * | 1993-04-23 | 1994-11-01 | Ishikawajima Harima Heavy Ind Co Ltd | Grain size classifying-type ash recirculation device |
| CN104990071A (en) * | 2015-05-22 | 2015-10-21 | 四川省宜宾惠美线业有限责任公司 | Circulating fluidized bed boiler capable of adjusting circulating ash flow |
| CN206608948U (en) * | 2017-03-30 | 2017-11-03 | 德清县中能热电有限公司 | Environment-friendly type fluidized-bed combustion boiler |
| CN209763052U (en) * | 2019-01-29 | 2019-12-10 | 无锡华光工业锅炉有限公司 | Circulating fluidized bed boiler return ash conveying structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109631027A (en) | 2019-04-16 |
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