CN108224464A - It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device - Google Patents
It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device Download PDFInfo
- Publication number
- CN108224464A CN108224464A CN201810161961.9A CN201810161961A CN108224464A CN 108224464 A CN108224464 A CN 108224464A CN 201810161961 A CN201810161961 A CN 201810161961A CN 108224464 A CN108224464 A CN 108224464A
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- China
- Prior art keywords
- flue
- heat primary
- air
- primary air
- duct
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- 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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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
- F23J3/026—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses it is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, including the vertical flue of economizer exit, air supply duct, heat primary air pipe, air preheater and the ash bucket for being arranged on economizer exit horizontal flue end；External bypass air duct, bypass air duct are connected by air supply duct with the vertical flue of economizer exit on heat primary air pipe；Heat primary air pipe and inlet flue duct are connected with air preheater.The present invention picks out an other wind pipeline on air preheater outlet heat primary air pipeline, heat primary air is sprayed by being arranged in the rectangular jet of the easy dust stratification position flue of economizer exit, the heat primary air of penetrating can cause the gas flow rate in dry and soft dust stratification region to increase, strength is carried at the ash bucket at dry ash to follow-up flue, dust stratification occurs from that can prevent economizer exit vertical section from turning horizontal segment corner.Structure size of the present invention is smaller, is easy to install in narrow space, while performance is safe and reliable；Construction volume and investment are smaller.
Description
Technical field
The invention belongs to boiler technology fields, and in particular to one kind prevents tail portion dust deposit in flue after coal-burning boiler denitration transformation
Device.
Background technology
Active service coal unit is ensures coal-burning boiler NO at presentxDischarge reaches national environmental standard, all uses substantially in pot
Stove back-end ductwork increases the technological means of denitrification apparatus.But due to the cloth that denitrification apparatus is not considered during active service unit initial design
It between emptying, therefore carries out usually arranging one section longer of horizontal straight tube section flue in economizer exit during denitration transformation, then
Flue is turned highly enters back into denitrification apparatus to the preceding paragraph.The entrance of denitrification apparatus will be generally higher by more than horizontal straight tube section 10m,
Therefore when being turned to or being flowed up by horizontal segment, coarse grained ash branch detaches down the ash content in flue gas under gravity
Come, so as to fall in flue.Therefore the dust stratification amount in the horizontal segment flue greatly increases, generally can be to clear up this part dust stratification
Turn to install ash bucket below the bend of vertical section additional close to the horizontal segment of denitrification apparatus, to reduce the dust stratification in horizontal flue, but in portion
It is found in point power plant's actual motion, it is more that economizer exit vertical section turns dust stratification in the elbow of horizontal segment, such as is fired in certain 600MW
Coal compressor emergency shutdown finds dust stratification up to 300~400t at this during overhauling, and leads to unit economizer exit to denitration inlet flue gas
Resistance increases, while artificial deashing workload is larger during maintenance down, and working space is narrow causes deashing difficulty larger.Needle
The processing mode traditional to the problem is to install ash bucket additional at the flue position of easy dust stratification, but which generally existing is following two
Shortcoming：(1) difficult arrangement since the air flue horizontal section turns to have installed ash bucket additional below the bend of section straight up before, causes
Arrange that the construction space that ash bucket and ash tube road need is insufficient herein；(2) construction volume needed for new ash bucket and investment are larger,
It needs to design the facilities such as new storehouse pump and ash conveying pipe.Therefore, it is not conform to using traditional processing mode for the dust stratification in this region
Reason.
Invention content
The shortcomings that it is an object of the invention to overcome the above-mentioned prior art, provide one kind prevent coal-burning boiler denitration be transformed after
The device of back-end ductwork dust stratification, boiler economizer outlet vertical section turns level after which can solve coal unit denitration transformation
The problem of section corner dust stratification is more.
In order to achieve the above objectives, the present invention is achieved by the following scheme：
It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, including the vertical flue of economizer exit,
Air supply duct, heat primary air pipe, air preheater and the ash bucket for being arranged on economizer exit horizontal flue end；Heat primary air
External bypass air duct, bypass air duct are connected by air supply duct with the vertical flue of economizer exit on pipe；Heat primary air
Pipe and inlet flue duct are connected with air preheater.
Further improve of the invention is：
The pneumatic control valve for the heat primary air flow for entering air supply duct to be adjusted is provided on bypass air duct.
Close to horizontal flue on the vertical flue of economizer exit, and row's rectangle is disposed in furnace chamber width
Spout, heat primary air spray into the corner that vertical flue turns horizontal flue by rectangular jet.
The length b of each rectangular jet is 10~20mm, and length c is 50~80mm.
Angle D between air supply duct and vertical plane is 10 °~40 °.
Compared with prior art, the invention has the advantages that：
The present invention picks out an other wind pipeline on air preheater outlet heat primary air pipeline, by heat primary air by being arranged in
The rectangular jet of the easy dust stratification position flue of economizer exit sprays into, and the heat primary air of penetrating can lead to the gas in dry and soft dust stratification region
Flow velocity increases, and strength is carried at the ash bucket at dry ash to follow-up flue, turns horizontal segment from that can prevent economizer exit vertical section
There is dust stratification in corner.The present invention has simple in structure, safe and reliable, while does not need to often safeguard；Apparatus structure size compared with
It is small, it is easy to install in narrow space, while performance is safe and reliable；Construction volume and investment are smaller.
Further right, the present invention is equipped with 1 pneumatic control valve on bypass air duct, according to unit load and economizer exit
Air quantity is adjusted in the dust stratification situation that vertical flue turns horizontal flue corner.
Description of the drawings
Fig. 1 is the main view installation diagram of the present invention；
Fig. 2 is economizer exit vertical flue outer wall front view in A-A directions in Fig. 1.
Wherein, the vertical flues of 1-；2- air supply ducts；3- pneumatic control valves；4- bypasses air duct；5- heat primary air pipes；6- is empty
Air preheater；7- air preheater inlet flue ducts；8- ash buckets；9- rectangular jets.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Referring to Fig. 1, it is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, erected including economizer exit
Straight flue 1, air supply duct 2, pneumatic control valve 3, bypass air duct 4, heat primary air pipe 5, air preheater 6, air preheater import cigarette
Road 7, ash bucket 8 and rectangular jet 9.
On heat primary air pipe 5 it is external one bypass air duct 4, bypass air duct 4 on set a pneumatic control valve 3, into
The heat primary air flow for entering air supply duct 2 is adjusted；Close horizontal flue, burner hearth are wide on the vertical flue 1 of economizer exit
Degree arranges row's rectangular jet 9 on direction, and heat primary air sprays into the corner that vertical flue turns horizontal flue by rectangular jet,
So as to improve the gas flow rate in easy dust stratification region, using the rolling action of gas, mixed with flue gas, dry ash is follow-up
At the ash bucket of flue.
Each the angle D between air supply duct 2 and vertical plane is 10 °~40 °, is so designed that, can ensure to be sprayed by rectangle
The heat primary airs that mouth 9 sprays into can reach rapidly the corner that vertical flue turns horizontal flue, avoid the occurrence of air-flow dead zone, and then
Prevent corner from a large amount of dry ashes occur.
The length b of each rectangular jet 9 is 10~20mm, and length c is 50~80mm.It is so designed that, rectangular jet 9 is sent
Wind effect is more preferable.
The course of work of the present invention：
In unit normal operation constantly, by air supply duct 2, (about 10~30m/s) injects economizer to heat primary air at a high speed
The corner of vertical 1 turn of horizontal direction of flue is exported, since rectangular jet 9 is arranged intensive in furnace chamber width, heat is primary
Wind can reach rapidly the flue corner, avoid the occurrence of air-flow dead zone, since the flow velocity of heat primary air is not less than flue gas in flue
Flow velocity, therefore the heat primary air for spraying into the corner of the vertical 1 turn of horizontal direction of flue of economizer exit can be carried and be fallen at this
Dry ash move to backward at the ash bucket of follow-up flue, so as to complete the collection of dry ash, prevent flue corner at this from occurring
Dust stratification, and then unit operation economy is improved, artificial deashing amount during decreasing maintenance.
More than content is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within claims of the present invention
Protection domain within.
Claims (5)
1. it is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, which is characterized in that including economizer exit
Vertical flue (1), air supply duct (2), heat primary air pipe (5), air preheater (6) and it is arranged on the horizontal cigarette of economizer exit
The ash bucket (8) of road end；External bypass air duct (4), bypass air duct (4) pass through air supply duct (2) on heat primary air pipe (5)
It is connected with the vertical flue of economizer exit (1)；Heat primary air pipe (5) and inlet flue duct (7) with air preheater (6) phase
Even.
2. with it is described in claim 1 prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, which is characterized in that it is other
The pneumatic control valve (3) for the heat primary air flow for entering air supply duct (2) to be adjusted is provided on transportation work style road (4).
3. with it is described in claim 1 prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, which is characterized in that
Close to horizontal flue on the vertical flue of economizer exit (1), and row's rectangular jet is disposed in furnace chamber width
(9), heat primary air turns the corner of horizontal flue by the vertical flue of rectangular jet (9) penetrating.
4. with described in claim 3 prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, which is characterized in that it is every
The length b of a rectangular jet (9) is 10~20mm, and length c is 50~80mm.
5. with it is described in claim 1 prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device, which is characterized in that send
Angle D of the wind pipeline (2) between vertical plane is 10 °~40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161961.9A CN108224464A (en) | 2018-02-27 | 2018-02-27 | It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161961.9A CN108224464A (en) | 2018-02-27 | 2018-02-27 | It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device |
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| Publication Number | Publication Date |
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| CN108224464A true CN108224464A (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810161961.9A Pending CN108224464A (en) | 2018-02-27 | 2018-02-27 | It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050237A (en) * | 2020-09-09 | 2020-12-08 | 湖南衡兴环保科技开发有限公司 | Boiler outlet flue structure with ash cleaning holes |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5687656A (en) * | 1994-10-25 | 1997-11-18 | Mitsubishi Jukogyo Kabushiki Kaisha | Denitration apparatus for a caol-fired boiler |
| JP2010046579A (en) * | 2008-08-20 | 2010-03-04 | Babcock Hitachi Kk | Flue gas denitrizer |
| CN203349279U (en) * | 2013-06-05 | 2013-12-18 | 西安热工研究院有限公司 | Pneumatic ash removal device of boiler |
| CN204513425U (en) * | 2015-03-10 | 2015-07-29 | 石福军 | A kind of negative pressure is from drawing-in type boiler flue dust stratification removal system |
| CN105716100A (en) * | 2016-03-31 | 2016-06-29 | 大唐环境产业集团股份有限公司 | Denitrating coal economizer high-temperature bypass device |
| CN205586830U (en) * | 2016-03-31 | 2016-09-21 | 大唐环境产业集团股份有限公司 | Denitration reactor entry ash bucket device |
| CN207907273U (en) * | 2018-02-27 | 2018-09-25 | 西安西热节能技术有限公司 | It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device |
-
2018
- 2018-02-27 CN CN201810161961.9A patent/CN108224464A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5687656A (en) * | 1994-10-25 | 1997-11-18 | Mitsubishi Jukogyo Kabushiki Kaisha | Denitration apparatus for a caol-fired boiler |
| US5687656B1 (en) * | 1994-10-25 | 2000-02-15 | Mitsubishi Heavy Ind Ltd | Denitration apparatus for a coal-fired boiler |
| JP2010046579A (en) * | 2008-08-20 | 2010-03-04 | Babcock Hitachi Kk | Flue gas denitrizer |
| CN203349279U (en) * | 2013-06-05 | 2013-12-18 | 西安热工研究院有限公司 | Pneumatic ash removal device of boiler |
| CN204513425U (en) * | 2015-03-10 | 2015-07-29 | 石福军 | A kind of negative pressure is from drawing-in type boiler flue dust stratification removal system |
| CN105716100A (en) * | 2016-03-31 | 2016-06-29 | 大唐环境产业集团股份有限公司 | Denitrating coal economizer high-temperature bypass device |
| CN205586830U (en) * | 2016-03-31 | 2016-09-21 | 大唐环境产业集团股份有限公司 | Denitration reactor entry ash bucket device |
| CN207907273U (en) * | 2018-02-27 | 2018-09-25 | 西安西热节能技术有限公司 | It is a kind of prevent coal-burning boiler denitration be transformed after tail portion dust deposit in flue device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050237A (en) * | 2020-09-09 | 2020-12-08 | 湖南衡兴环保科技开发有限公司 | Boiler outlet flue structure with ash cleaning holes |
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