CN111981501A - Anti-blocking heat exchange device of air preheater of pulverized coal boiler - Google Patents
Anti-blocking heat exchange device of air preheater of pulverized coal boiler Download PDFInfo
- Publication number
- CN111981501A CN111981501A CN202010750602.4A CN202010750602A CN111981501A CN 111981501 A CN111981501 A CN 111981501A CN 202010750602 A CN202010750602 A CN 202010750602A CN 111981501 A CN111981501 A CN 111981501A
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- CN
- China
- Prior art keywords
- air preheater
- outer frame
- pulverized coal
- heat exchange
- hollow cylinder
- 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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- 239000003245 coal Substances 0.000 title claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 13
- 206010022000 influenza Diseases 0.000 claims abstract description 5
- 238000002955 isolation Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 14
- 239000003546 flue gas Substances 0.000 abstract description 14
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000428 dust Substances 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- F23L15/00—Heating of air supplied for combustion
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The invention discloses an anti-blocking heat exchange device for an air preheater of a pulverized coal boiler, which comprises a main body, wherein pipelines are arranged at two ends of the main body and are connected with a dust remover and an induced draft fan, and a plurality of heat exchanger unit modules are divided in the main body. The heat exchanger unit module comprises an outer frame, the outer frame is of a square or cuboid structure, two ends of the outer frame are flues, and hollow cylinders are arranged inside the outer frame. The direction of flue seting up at frame both ends is the same with the pipeline installation direction, and hollow cylinder installation direction is perpendicular with the pipeline installation direction, and forced draught blower and air preheater are connected respectively to hollow cylinder both ends. The invention improves the temperature of the flue gas at the outlet of the air preheater and can effectively relieve the blockage phenomenon of the air preheater caused by ammonium bisulfate. The invention exchanges heat at the inlet of the induced draft fan, reduces the temperature of the flue gas entering the smoke window of the boiler and improves the boiler efficiency.
Description
Technical Field
The invention belongs to the technical field of boiler heat exchange, and relates to an anti-blocking heat exchange device for an air preheater of a pulverized coal boiler.
Background
With the enhancement of national environmental regulations, the flue gas denitration device (SCR/SNCR) of the power station boiler is widely applied to various power plants, and the problems of ammonia escape, ammonium bisulfate deposition ash blockage and corrosion are more common. The ammonium bisulfate has strong cohesiveness at 147-200 ℃, so that the air preheater has serious problems of ash blockage and corrosion. Therefore, the problems of increased running resistance of the air preheater, increased power consumption of the induced draft fan, reduced heat exchange performance of the air preheater, increased air leakage rate of the air preheater, corrosion of heat storage elements and the like are caused, and the load capacity and the running safety of the boiler are even affected in severe cases. Therefore, a device is needed to be designed for solving the problems of ash blockage and corrosion of the air preheater in the working process of the existing boiler.
Disclosure of Invention
The invention aims to provide an anti-blocking heat exchange device for an air preheater of a pulverized coal boiler, which solves the problems of ash blocking and corrosion of an air preheater in the prior art.
The technical scheme includes that the anti-blocking heat exchange device of the air preheater of the pulverized coal boiler comprises a main body, pipelines are arranged at two ends of the main body, and a plurality of heat exchanger unit modules are divided in the main body.
The invention is also characterized in that:
the heat exchanger unit module comprises an outer frame, the outer frame is of a square or cuboid structure, two ends of the outer frame are flues, and hollow cylinders are arranged inside the outer frame.
The flue opening direction at the two ends of the outer frame is the same as the flue installation direction, and the hollow cylinder installation direction is perpendicular to the pipeline installation direction.
The outer wall of the hollow cylinder is sleeved with H-shaped fins, and the interval between the fins is 1-2 cm.
Two planes at the two ends of the hollow cylinder of the outer frame are provided with inserting plate isolation doors.
The invention has the beneficial effects that:
1. the invention improves the temperature of the flue gas at the outlet of the air preheater and the temperature of the secondary air entering the air preheater. The blockage phenomenon of the air preheater caused by the ammonium bisulfate can be effectively relieved.
2. The invention exchanges heat with the flue gas at the inlet of the induced draft fan, thereby effectively reducing the temperature of the flue gas discharged by the boiler and effectively ensuring the efficiency of the boiler.
Drawings
FIG. 1 is a schematic structural diagram of an anti-blocking heat exchange device of an air preheater of a pulverized coal boiler according to the present invention;
FIG. 2 is a schematic structural diagram of a heat exchanger unit module of an anti-blocking heat exchange device of an air preheater of a pulverized coal boiler according to the present invention;
FIG. 3 is a top view of an anti-blocking heat exchange device of an air preheater of a pulverized coal boiler according to the present invention;
FIG. 4 is a schematic diagram of the operation of the anti-blocking heat exchanger of the air preheater of the pulverized coal boiler of the present invention;
in the figure, 1, a main body, 2, a heat exchanger unit module, 3, a pipeline, 2-1, an outer frame, 2-2, a hollow cylinder and 2-3, a plug board isolation door are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model provides a pulverized coal fired boiler air preheater prevents stifled heat transfer device, as shown in figure 1, including main part 1, 1 both ends of main part are provided with pipeline 3, and pipeline 3 connects dust remover and draught fan, and the inside division of main part has a plurality of heat exchanger unit module 2.
As shown in fig. 2 and 3, the heat exchanger unit module 2 comprises an outer frame 2-1, wherein the outer frame 2-1 is in a cube or cuboid structure, two ends of the outer frame 2-1 are flues, and a hollow cylinder 2-2 is arranged inside the outer frame 2-1. The direction of the flue at the two ends of the outer frame 2-1 is the same as the installation direction of the pipeline 3, the installation direction of the hollow cylinder 2-2 is vertical to the installation direction of the pipeline 3, and the two ends of the hollow cylinder 2-2 are respectively connected with the air feeder and the air preheater.
The outer wall of the hollow cylinder 2-2 is sleeved with H-shaped fins, the interval between the fins is 1-2cm, and the H-shaped fins are used for increasing the contact area and improving the heat exchange efficiency.
The height of the corrugated plate heat exchange plate of the original air preheater is reduced by 20-40 cm. And increasing the temperature of the flue gas at the outlet of the air preheater.
Two planes where the end parts of the two ends of the hollow cylinder 2-2 of the outer frame 2-1 are positioned are provided with inserting plate isolation doors 2-3. Each heat exchanger unit module 2 can be hung out from the top of the main body 1 for ash removal, leakage detection and maintenance. The flashboard isolation doors 2-3 of each heat exchanger unit module 2 are closed for service.
The invention relates to an anti-blocking heat exchange device of a pulverized coal boiler air preheater, which comprises the following working processes:
as shown in fig. 4, the main body 1 is connected with the dust remover and the induced draft fan through the flue, the flue gas from the dust remover enters the main body 1 through the flue, the induced draft fan of the flue on the other side works to provide power, the flue gas enters the heat exchanger unit module 2 in the main body 1, and the flues at two ends of the heat exchanger unit module 2 enter and exit one by one.
The flue gas enters the heat exchanger unit module 2 and passes through the outer side of the hollow cylinder 2-2, the flue gas entering direction is perpendicular to the installation direction of the hollow cylinder 2-2, the flue gas transfers heat to secondary air in the hollow cylinder 2-2, and the air feeder provides power to deliver the secondary air to the air preheater through the hollow cylinder 2-2.
The invention discloses an anti-blocking heat exchange device for an air preheater of a pulverized coal boiler, which has the beneficial effects that:
1. the temperature of the flue gas at the outlet of the air preheater and the temperature of the secondary air entering the air preheater are improved. Effectively relieve the blockage phenomenon of the air preheater caused by the ammonium bisulfate.
2. The heat exchange is carried out on the flue gas at the inlet of the draught fan, the smoke exhaust temperature of the boiler is effectively reduced, and the boiler efficiency is guaranteed not to be reduced.
3. Each unit module is a unit module as shown in fig. 2, and an isolation inserting plate door is arranged at a secondary air inlet and a secondary air outlet of each unit module, so that when a leakage phenomenon occurs in one unit, the unit modules can be effectively isolated. And the unit module is lifted out from the right upper part of the flue, and the flue side of the unit is blocked by a steel plate. So as not to affect the normal operation of the flue.
Claims (5)
1. The utility model provides a pulverized coal boiler air preheater prevents stifled heat transfer device which characterized in that, including main part (1), main part (1) both ends are provided with pipeline (3), and the inside division of main part has a plurality of independent heat transfer unit module (2).
2. The pulverized coal fired boiler air preheater blockage-preventing heat exchange device as claimed in claim 1, wherein the heat exchanger unit module (2) comprises an outer frame (2-1), the outer frame (2-1) is of a cube or cuboid structure, two ends of the outer frame (2-1) are flues, and a hollow cylinder (2-2) is arranged inside the outer frame (2-1).
3. The pulverized coal fired boiler air preheater anti-blocking heat exchange device as defined in claim 2, wherein flue opening directions at both ends of the outer frame (2-1) are the same as the installation direction of the pipeline (3), and the installation direction of the hollow cylinder (2-2) is perpendicular to the installation direction of the pipeline (3).
4. The anti-blocking heat exchange device of the air preheater of the pulverized coal fired boiler as claimed in claims 1-3, wherein the outer wall of the hollow cylinder (2-2) is sleeved with H-shaped fins, and the interval between the fins is 1-2 cm.
5. The pulverized coal boiler air preheater anti-blocking heat exchange device as claimed in claims 1-3, wherein two planes where the end parts of the two ends of the hollow cylinder (2-2) of the outer frame (2-1) are located are provided with inserting plate isolation doors (2-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010750602.4A CN111981501A (en) | 2020-07-30 | 2020-07-30 | Anti-blocking heat exchange device of air preheater of pulverized coal boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010750602.4A CN111981501A (en) | 2020-07-30 | 2020-07-30 | Anti-blocking heat exchange device of air preheater of pulverized coal boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111981501A true CN111981501A (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010750602.4A Pending CN111981501A (en) | 2020-07-30 | 2020-07-30 | Anti-blocking heat exchange device of air preheater of pulverized coal boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111981501A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413275A (en) * | 2021-12-24 | 2022-04-29 | 华能巢湖发电有限责任公司 | Method for treating blockage of air preheater and reducing flue pressure |
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| CN107642793A (en) * | 2017-08-01 | 2018-01-30 | 中国大唐集团科学技术研究院有限公司华北分公司 | Prevent ammonium hydrogen sulfate from blocking the system and method for air preheater after SCR denitration transformation |
| CN207797107U (en) * | 2018-01-30 | 2018-08-31 | 大城县琦泉生物质发电有限公司 | A kind of air preheater |
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| CN111271727A (en) * | 2020-03-03 | 2020-06-12 | 东方电气集团东方锅炉股份有限公司 | System for preventing deposition of ammonium bisulfate in air preheater and tail waste heat utilization equipment and control method thereof |
| CN212869837U (en) * | 2020-07-30 | 2021-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Prevent that air preheater from blockking up heat transfer device |
-
2020
- 2020-07-30 CN CN202010750602.4A patent/CN111981501A/en active Pending
Patent Citations (10)
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|---|---|---|---|---|
| KR20050050415A (en) * | 2003-11-25 | 2005-05-31 | 이경구 | Waste heat retrieval device of having means of protect erosion in the low temperature |
| CN102588944A (en) * | 2012-02-28 | 2012-07-18 | 天津宝成机械制造股份有限公司 | Low-temperature flue-gas heat recycling and utilization system |
| CN104633647A (en) * | 2014-08-21 | 2015-05-20 | 成信绿集成股份有限公司 | Emission reduction and energy saving system capable of omitting GGH |
| CN204943443U (en) * | 2015-07-29 | 2016-01-06 | 北京市伟业供热设备有限责任公司 | A kind of modularization flue gas waste heat recovery apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114413275A (en) * | 2021-12-24 | 2022-04-29 | 华能巢湖发电有限责任公司 | Method for treating blockage of air preheater and reducing flue pressure |
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