CN110118362B - Tubular air preheater capable of preventing ammonium bisulfate from being blocked - Google Patents
Tubular air preheater capable of preventing ammonium bisulfate from being blocked Download PDFInfo
- Publication number
- CN110118362B CN110118362B CN201910498171.4A CN201910498171A CN110118362B CN 110118362 B CN110118362 B CN 110118362B CN 201910498171 A CN201910498171 A CN 201910498171A CN 110118362 B CN110118362 B CN 110118362B
- Authority
- CN
- China
- Prior art keywords
- air
- heat exchange
- flue gas
- primary
- secondary air
- 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
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003546 flue gas Substances 0.000 claims abstract description 49
- 238000005192 partition Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 2
- 239000000779 smoke Substances 0.000 abstract description 6
- 239000000428 dust Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F23L15/04—Arrangements of recuperators
-
- 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)
- Air Supply (AREA)
Abstract
The invention discloses a tubular air preheater capable of preventing ammonium bisulfate from being blocked, which comprises an air preheater shell, wherein the middle in the air preheater shell is divided into a primary air heat exchange area and a secondary air heat exchange area by a primary air channel partition plate and a secondary air channel partition plate, the same sides of the primary air heat exchange area and the secondary air heat exchange area are respectively provided with a primary air inlet channel and a secondary air inlet channel, and the opposite sides are respectively provided with a primary air outlet and a secondary air outlet; a plurality of flue gas pipelines are uniformly arranged in the air preheater shell, one ends of the flue gas pipelines are flue gas inlets, and the other ends of the flue gas pipelines are flue gas outlets. According to the invention, the temperature of the heat exchange area in the tubular air preheater is increased to decompose ammonium bisulfate, so that the blockage of each load section can be cleaned on line, the temperature of primary hot air, the temperature of secondary hot air and the temperature of discharged smoke are not greatly different from the design value, and the adverse effects on boiler combustion and the follow-up dust remover of the air preheater are avoided.
Description
Technical Field
The invention belongs to the field of boiler tubular air pre-heaters, and particularly relates to a tubular air pre-heater capable of preventing ammonium bisulfate from being blocked.
Background
Along with the increasing strictness of national pollutant emission control, the NOx emission standard of boiler emission is lower and lower, in order to meet the national regulation requirement, a flue gas SCR denitration device is designed or modified and additionally arranged on the boiler, nitrogen oxides are decomposed into nitrogen and water under the action of a catalyst, but a small amount of inevitable sulfur dioxide can be oxidized to generate sulfur trioxide, and ammonium bisulfate is generated at a proper temperature with escaped ammonia which does not participate in denitration reaction.
Ammonium bisulfate is a high-viscosity substance which is extremely easy to adhere to the heat exchange surface of the air preheater and captures dust particles in flue gas, thereby blocking the air preheater.
The tubular air preheater is air preheater equipment commonly used for a power station boiler, because the flow area of flue gas in a tube is narrow, if ammonium bisulfate is stuck on the inner wall surface of the tube, the flue gas pipeline is very easy to block, and as more and more flue gas pipelines are blocked, the pressure difference between an inlet and an outlet of the tubular air preheater is too large, and because of the lack of an effective tubular air preheater soot blower, the boiler is forced to be shut down for cleaning.
At present, no better treatment method is available for the ammonium bisulfate blockage of the tubular air preheater, and the ammonium bisulfate blockage is generally cleaned by blowing out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a tubular air preheater capable of preventing ammonium bisulfate from being blocked.
The invention is realized by adopting the following technical scheme:
the tubular air preheater capable of preventing ammonium bisulfate from being blocked comprises an air preheater shell, wherein the middle in the air preheater shell is divided into a primary air heat exchange area and a secondary air heat exchange area by a primary air channel partition plate and a secondary air channel partition plate, a primary air inlet channel and a secondary air inlet channel are respectively arranged on the same side of the primary air heat exchange area and the secondary air heat exchange area, and a primary air outlet and a secondary air outlet are respectively arranged on the opposite side of the primary air heat exchange area and the secondary air heat exchange area; a plurality of flue gas pipelines are uniformly arranged in the air preheater shell, one ends of the flue gas pipelines are flue gas inlets, and the other ends of the flue gas pipelines are flue gas outlets.
The invention further improves that the primary air heat exchange area in the tubular air preheater is divided into a plurality of primary air heat exchange subareas perpendicular to the primary air direction, and the areas are separated by a primary air area partition board.
The invention is further improved in that the secondary air heat exchange area in the tubular air preheater is divided into a plurality of secondary air heat exchange subareas perpendicular to the secondary air direction, and the subareas are separated by secondary air area partition boards.
The invention is further improved in that the primary air inlet duct is divided into a plurality of primary air inlet subareas perpendicular to the primary air direction, and the subareas are separated by primary air area separators.
The invention is further improved in that each primary air inlet subarea divided in the primary air inlet duct is provided with a primary air inlet subarea air door baffle.
The invention is further improved in that the secondary air inlet duct is divided into a plurality of secondary air inlet subareas perpendicular to the secondary air direction, and the subareas are separated by secondary air area separators.
The invention is further improved in that each secondary air inlet subarea divided in the secondary air inlet duct is provided with a secondary air inlet subarea air door baffle.
When the tubular air preheater works, the flue gas flows into the tubular air preheater from a flue gas inlet, flows in a flue gas pipeline, flows out from a flue gas outlet, and both primary air and secondary air flow in an air preheater shell; closing a primary air inlet subarea air door baffle and a secondary air inlet subarea air door baffle, wherein no primary air cold air or secondary air cold air flows through the two areas, but high-temperature smoke still flows through smoke pipelines in the corresponding primary air heat exchange subarea and secondary air heat exchange subarea, so that the temperatures of the corresponding primary air heat exchange subarea and secondary air heat exchange subarea gradually rise to 260-270 ℃, and ammonium bisulfate adhered to the smoke pipelines in the primary air heat exchange subarea and the secondary air heat exchange subarea is decomposed into gas at the temperatures, so that the blocked smoke pipelines in the areas are dredged.
The invention is further improved in that the steps are repeated in sequence, so that the decomposition of the ammonium bisulfate adhered in all the primary air heat exchange subregions and the secondary air heat exchange subregions is ensured, and all the flue gas pipelines of the whole tubular air preheater are ensured not to be blocked.
The invention has the following beneficial technical effects:
according to the tubular air preheater capable of preventing the blockage of ammonium bisulfate, the temperature of the heat exchange area in the tubular air preheater is increased to decompose ammonium bisulfate in a partitioning manner, so that the blockage of each load section can be cleaned on line, the primary hot air temperature, the secondary hot air temperature and the smoke discharging temperature are not greatly different from the design values, and the adverse effects on boiler combustion and the follow-up dust remover of the air preheater are avoided.
Drawings
FIG. 1 is a front view of a tubular air preheater for preventing ammonium bisulfate from clogging in accordance with the present invention;
FIG. 2 is a top view of a tubular air preheater for preventing ammonium bisulfate from clogging in accordance with the present invention;
FIG. 3 is a side view of a tubular air preheater according to the present invention for preventing ammonium bisulfate from clogging.
Reference numerals illustrate:
1 is an air preheater shell; 2 is a first and a second air channel partition plates; 3 is a primary air area partition board; 4 is a secondary air area partition board; 5 is a flue gas pipeline; 6 is a primary air heat exchange sub-area; 7 is a secondary air heat exchange sub-area; 8 is a primary air inlet duct; 9 is a secondary air inlet duct; 10 is a damper baffle of a primary air inlet subarea; 11 is a damper baffle of a secondary air inlet subarea; 12 is a primary air outlet; 13 is a secondary air outlet; 14 is a flue gas inlet; 15 is the flue gas outlet.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the tubular air preheater capable of preventing ammonium bisulfate from being blocked comprises an air preheater shell 1, wherein the middle in the air preheater shell 1 is divided into a primary air heat exchange area and a secondary air heat exchange area by a primary air channel partition plate 2 and a secondary air channel partition plate 2, the same sides of the primary air heat exchange area and the secondary air heat exchange area are respectively provided with a primary air inlet channel 8 and a secondary air inlet channel 9, and the opposite sides are respectively provided with a primary air outlet 12 and a secondary air outlet 13; a plurality of flue gas pipelines 5 are uniformly arranged in the air preheater shell 1, one end of each flue gas pipeline 5 is a flue gas inlet 14, and the other end is a flue gas outlet 15. The primary air heat exchange area in the tubular air preheater is divided into a plurality of primary air heat exchange subareas 6 perpendicular to the primary air direction, and the areas are separated by a primary air area partition plate 3. The secondary air heat exchange area in the tubular air preheater is divided into a plurality of secondary air heat exchange subareas 7 perpendicular to the secondary air direction, and the areas are separated by secondary air area partition boards 4.
Wherein, the primary air inlet duct 8 is divided into a plurality of primary air inlet subareas perpendicular to the primary air direction, and each area is separated by a primary air area separator 3. And each primary air inlet subarea divided in the primary air inlet duct 8 is provided with a primary air inlet subarea damper baffle 10. The secondary air inlet duct 9 is divided into a plurality of secondary air inlet subareas perpendicular to the secondary air direction, and the subareas are separated by a secondary air area partition board 4. And each secondary air inlet subarea divided in the secondary air inlet duct 9 is provided with a secondary air inlet subarea damper baffle 11.
When the tubular air preheater works, flue gas flows into the tubular air preheater from a flue gas inlet 14, flows in a flue gas pipeline 5, flows out from a flue gas outlet 15, and both primary air and secondary air flow in the air preheater shell 1. Closing a primary air inlet subarea air door baffle and a secondary air inlet subarea air door baffle, wherein no primary air cold air or secondary air cold air flows through the two areas, but high-temperature flue gas still flows through the flue gas pipelines 5 in the corresponding primary air heat exchanger subarea 6 and secondary air heat exchanger subarea 7, so that the temperatures of the corresponding primary air heat exchanger subarea 6 and secondary air heat exchanger subarea 7 gradually rise to 260-270 ℃, and ammonium bisulfate adhered to the flue gas pipelines 5 in the primary air heat exchanger subarea 6 and secondary air heat exchanger subarea 7 is decomposed into gas at the temperatures, so that the flue gas pipelines 5 blocked in the areas are dredged. The operation is repeated, so that all ammonium bisulfate adhered in the primary air heat exchanger subarea 6 and the secondary air heat exchanger subarea 7 are decomposed, and all flue gas pipelines 5 of the whole tubular air preheater are prevented from being blocked.
Claims (2)
1. The tubular air preheater capable of preventing the blockage of ammonium bisulfate is characterized by comprising an air preheater shell (1), wherein the middle in the air preheater shell (1) is divided into a primary air heat exchange area and a secondary air heat exchange area by a primary air channel partition plate (2) and a secondary air channel partition plate (2), the same sides of the primary air heat exchange area and the secondary air heat exchange area are respectively provided with a primary air inlet channel (8) and a secondary air inlet channel (9), and the opposite sides are respectively provided with a primary air outlet (12) and a secondary air outlet (13); a plurality of flue gas pipelines (5) are uniformly arranged in the air preheater shell (1), one end of each flue gas pipeline (5) is a flue gas inlet (14), and the other end is a flue gas outlet (15);
the primary air heat exchange area in the tubular air preheater is divided into a plurality of primary air heat exchange subareas (6) perpendicular to the primary air direction, and the areas are separated by primary air area separation plates (3);
the secondary air heat exchange area in the tubular air preheater is divided into a plurality of secondary air heat exchange subareas (7) perpendicular to the secondary air direction, and the areas are separated by secondary air area separation plates (4);
the primary air inlet duct (8) is divided into a plurality of primary air inlet subareas perpendicular to the primary air direction, and the areas are separated by a primary air area partition board (3);
each primary air inlet subarea divided in the primary air inlet duct (8) is provided with a primary air inlet subarea air door baffle (10);
the secondary air inlet duct (9) is divided into a plurality of secondary air inlet subareas perpendicular to the secondary air direction, and all the subareas are separated by a secondary air area partition board (4);
each secondary air inlet subarea divided in the secondary air inlet duct (9) is provided with a secondary air inlet subarea air door baffle (11);
when the tubular air preheater works, flue gas flows into the tubular air preheater from a flue gas inlet (14), flows in a flue gas pipeline (5), flows out from a flue gas outlet (15), and both primary air and secondary air flow in an air preheater shell (1); closing a primary air inlet subarea air door baffle (10) and a secondary air inlet subarea air door baffle (11), wherein no primary air cold air or secondary air cold air flows through the two areas, but high-temperature flue gas still flows through the flue gas pipelines (5) in the corresponding primary air heat exchange subarea (6) and secondary air heat exchange subarea (7), so that the temperatures of the corresponding primary air heat exchange subarea (6) and secondary air heat exchange subarea (7) are gradually increased to 260-270 ℃, and at the temperatures, ammonium bisulfate adhered to the flue gas pipelines (5) in the primary air heat exchange subarea (6) and the secondary air heat exchange subarea (7) is decomposed into gas, so that the flue gas pipelines (5) blocked in the areas are dredged.
2. The tubular air preheater capable of preventing ammonium bisulfate blockage according to claim 1, wherein the steps of the tubular air preheater when in operation are repeated in sequence, so that ammonium bisulfate adhered in all primary air heat exchanger subregions (6) and secondary air heat exchanger subregions (7) is decomposed, and all flue gas pipelines (5) of the whole tubular air preheater are prevented from being blocked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910498171.4A CN110118362B (en) | 2019-06-10 | 2019-06-10 | Tubular air preheater capable of preventing ammonium bisulfate from being blocked |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910498171.4A CN110118362B (en) | 2019-06-10 | 2019-06-10 | Tubular air preheater capable of preventing ammonium bisulfate from being blocked |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110118362A CN110118362A (en) | 2019-08-13 |
| CN110118362B true CN110118362B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910498171.4A Active CN110118362B (en) | 2019-06-10 | 2019-06-10 | Tubular air preheater capable of preventing ammonium bisulfate from being blocked |
Country Status (1)
| Country | Link |
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| CN (1) | CN110118362B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500601A (en) * | 2019-08-22 | 2019-11-26 | 华能国际电力股份有限公司 | Method for treating excessive SCR denitration ammonia escape and blockage of air preheater |
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| WO2010133773A1 (en) * | 2009-05-22 | 2010-11-25 | Metso Power Oy | A preheater for combustion air, and a power plant |
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2019
- 2019-06-10 CN CN201910498171.4A patent/CN110118362B/en active Active
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