CN107906549B - System for reducing exhaust gas temperature of air preheater by replacing furnace bottom air leakage of power station boiler - Google Patents
System for reducing exhaust gas temperature of air preheater by replacing furnace bottom air leakage of power station boiler Download PDFInfo
- Publication number
- CN107906549B CN107906549B CN201711090447.2A CN201711090447A CN107906549B CN 107906549 B CN107906549 B CN 107906549B CN 201711090447 A CN201711090447 A CN 201711090447A CN 107906549 B CN107906549 B CN 107906549B
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- Prior art keywords
- air
- boiler
- furnace bottom
- air duct
- hot
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- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000007599 discharging Methods 0.000 abstract description 12
- 238000002407 reforming Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 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
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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 relates to a system for reducing the exhaust temperature of an air preheater by replacing furnace bottom air leakage of a power station boiler, which is characterized by comprising an air duct arranged below a water-cooled wall header of the boiler bottom, wherein the air duct is arranged on one side in front of the boiler, one side behind the boiler or both sides in front of and behind the boiler, hot air sprayed by the air duct forms an air curtain positioned at the boiler bottom, and the air duct is communicated with the hot air tank through a hot air pipe. The unit for reforming the wet slag discharging system into the dry slag discharging system is characterized in that the slag outlet air leakage coefficient is lower in the design stage, the air leakage coefficient is higher than the air leakage coefficient in the actual operation place, and the air leakage coefficient is difficult to control.
Description
Technical Field
The invention relates to a system for reducing the exhaust temperature of an air preheater by replacing furnace bottom air leakage of a power station boiler, and belongs to the technical field of boilers.
Background
The utility boiler equipment is core equipment of a large-scale thermal power plant, and the economic performance of the utility boiler equipment directly influences the power generation coal consumption index of the power plant. The working principle is that fossil fuel is combusted to generate heat, and water is heated to generate steam so as to drive the steam turbine generator unit to generate power. The flue gas system of the boiler system is shown in figure 1, cold air generated by a fan is sent into an air preheater 7 by a cold air duct 8, heated to become hot air, sent into a combustor 2 by a hot air box 5, combusted in a hearth 1, and then generated flue gas is sent into the air preheater 7 by a boiler flue 6 to provide a heat source for heating the hot air, then discharged from a cold flue 9 into a dust remover and a desulfurization system, and finally discharged from a chimney. Considering the ash discharging requirement, the boiler bottom 3 is provided with an ash discharging port 4, and the slag generated by the fuel falls down through the ash discharging port at the bottom of the boiler and is taken away by a slag discharging device. The negative pressure is arranged in the boiler hearth, and the slag discharging port of the furnace bottom sucks external cold air, namely, the furnace bottom leaks air.
The oxygen amount at the outlet of the boiler furnace is an on-line monitoring value, the total air consumption of combustion (including hot air and air leakage of the furnace body through the air preheater) and the generated smoke amount basically accord with design values when the coal quality is designed coal, if the air leakage of the slag discharging port at the bottom of the furnace is increased, the air quantity passing through the air preheater is reduced, the cooling condition of the air preheater is worse than that of the design state, and the exhaust temperature of the boiler is increased. The influence amplitude of the secondary air quantity change of the air preheater on the exhaust gas temperature and the like can be seen in the attached figure 2. This phenomenon is particularly evident in boilers adopting dry slag discharge, and after a wet slag discharge system is changed into dry slag discharge, the smoke discharge temperature is increased by about 8 ℃ under the same operation condition, and the power generation coal consumption is increased by more than 1 g/kwh. Air entering the hearth through the hearth slag hole is not heated by the air preheater, so that the temperature of the hearth is reduced, and the combustion efficiency is affected to a certain extent.
Disclosure of Invention
The invention aims to solve the technical problems that: the exhaust temperature of the air preheater commonly existing in the boiler unit adopting the dry slag discharging system is higher.
In order to solve the technical problems, the technical scheme of the invention provides a system for reducing the exhaust temperature of an air preheater by replacing the air leakage at the furnace bottom of a power station boiler, which is characterized by comprising an air duct arranged below a water-cooled wall header at the furnace bottom of the boiler, wherein the air duct is arranged on one side in front of the boiler or on one side behind the boiler or on both sides in front of and behind the boiler, hot air sprayed by the air duct forms an air curtain positioned at the furnace bottom of the boiler, and the air duct is communicated with a hot air box through a hot air pipe.
Preferably, an expansion joint is arranged on the hot air pipe.
Preferably, an air volume available air door is arranged on the hot air pipe, and the air volume available air door is adjusted through an actuating mechanism.
Preferably, if the air duct is arranged on one side in front of the boiler or on one side behind the boiler, a wear plate is arranged on the other side of the boiler opposite to the air duct seal.
Preferably, a containment plate is arranged below the air outlet of the air duct.
The basic idea of the system is that a hot air curtain is arranged at the slag hole of the bottom of the boiler, and the cold air leaked into the hearth is replaced by hot air. Through setting up the wind channel below the slag notch, introduce and have heated the back through the air preheater and have the hot-blast of certain pressure, the wind channel can arrange in unilateral (stokehold or stokehold), also can arrange in stokehold and back both sides, spouts the slag notch with hot-blast horizontal or slightly upward incline direction, forms hot-blast curtain on the slag notch section, prevents that cold wind from getting into furnace from here outside the stove. The vast majority of air fed into the hearth is heated by the air preheater, the air quantity through the air preheater is increased, the running and design deviation of the air preheater can be effectively eliminated, the deviation of the exhaust gas temperature from the design value is avoided, meanwhile, the cold air leaked into the hearth is greatly reduced, and the combustion efficiency can be improved to a certain extent.
The unit for reforming the wet slag discharging system into the dry slag discharging system is characterized in that the slag outlet air leakage coefficient is lower in the design stage, the air leakage coefficient is higher than the air leakage coefficient in the actual operation place, and the air leakage coefficient is difficult to control.
Drawings
FIG. 1 is a schematic diagram of a boiler combustion flue gas air system;
FIG. 2 is a schematic diagram showing the relationship between the secondary air quantity change and the exhaust gas temperature, the primary hot air and the secondary hot air temperature change;
FIG. 3 is a diagram of a single side arranged furnace bottom air leakage replacement system;
FIG. 4 is a diagram of a double sided arrangement furnace bottom air leakage replacement system.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
The invention provides a system for reducing the exhaust temperature of an air preheater by replacing furnace bottom air leakage of a power station boiler, which comprises an air duct 14 arranged below a furnace bottom water-cooled wall header, wherein the air duct 14 introduces hot air from a hot air box 5 through an air pipe 10. The hot air sprayed out of the air groove forms an air curtain 15 to prevent cold air leakage air flow at the slag outlet 4 from entering. The wind slots 14 may be arranged on one side, i.e. either before or after the boiler, as shown in fig. 3. The air ducts 14 may also be arranged bilaterally, i.e. in front of and behind the boiler as shown in fig. 4. The arrangement of the wind tunnel 14 is determined depending on the width of the tap hole 4 and the wind pressure.
The hot air pipe 10 is provided with an expansion joint 11, the air quantity can be regulated by an air door 12 through an actuating mechanism 13, and the air tank 14 is light in weight and can be hung below the horizontal part of the water-cooled wall of the boiler bottom 3. Considering the temperature difference between the hot blast pipe 10 and the furnace body, the difference in thermal expansion amount thereof is absorbed by the expansion joint 11.
Considering that the width of the boiler body 1 is wider, the air pipes 10 can be provided with a plurality of air pipes (at least 1 air pipe is arranged on the left and the right of the boiler) or the cross section size is increased, so that certain air pressure is maintained in the air groove 14 and the uneven amplitude of the pressure in the air groove 14 is reduced.
If a single-sided arrangement (fig. 3) is adopted, the anti-abrasion plate 16 can be arranged on the other side opposite to the air duct 14 seal, so that the structure of the airflow with slag and abrasion across the air duct is avoided.
In order to avoid the leakage of hot air from the slag hole, a containment plate 17 with a certain height is arranged below the air outlet of the air tank, or the containment plate is directly connected with the containment shell of slag discharging equipment below through an expansion joint (the structure does not belong to the scope of the patent), and the ejection direction of the hot air sprayed into the slag hole is adjusted to be inclined upwards by 0-30 degrees (the specific taking value is determined by on-site debugging), so that the overflow of the hot air is avoided.
The hot air quantity is required to be adjusted and determined on site. When the air door 12 is increased to have an effect on the change of the exhaust temperature of the air preheater approaching zero, the slag hole air curtain is indicated to be basically used for blocking the leaked cold air, and the opening degree of the air door can be fixed.
Claims (4)
1. The utility model provides a system for reducing air preheater exhaust temperature by replacing furnace bottom air leakage of a power station boiler, which is characterized by comprising an air duct (14) arranged below a water-cooled wall header of the boiler furnace bottom (3), wherein the air duct (14) is arranged on a single side in front of the boiler, or on a single side behind the boiler, or on both sides in front of and behind the boiler, hot air sprayed out of the air duct (14) forms an air curtain (15) positioned at the boiler furnace bottom (3) to prevent cold air outside the boiler from entering a hearth from the air duct, and the air duct (14) is communicated with a hot air box (5) through a hot air pipe (10); a containment plate (17) is arranged below the air outlet of the air groove (14) to prevent hot air from leaking out of the slag hole.
2. A system for reducing the exhaust temperature of an air preheater by replacing furnace bottom air leakage in a utility boiler according to claim 1, characterized in that an expansion joint (11) is arranged on the hot air duct (10).
3. A system for reducing the exhaust temperature of an air preheater by replacing furnace bottom air leakage of a power station boiler according to claim 1, wherein an air quantity adjustable air door (12) is arranged on the hot air pipe (10), and the air quantity adjustable air door (12) is adjusted by an actuating mechanism (13).
4. A system for reducing the exhaust temperature of an air preheater by replacing a furnace bottom air leakage of a utility boiler according to claim 1, characterized in that if the air duct (14) is arranged on a single side in front of the boiler or on a single side behind the boiler, an anti-wear plate (16) is arranged on the other side of the furnace bottom (3) of the boiler facing the air outlet of the air duct (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711090447.2A CN107906549B (en) | 2017-11-08 | 2017-11-08 | System for reducing exhaust gas temperature of air preheater by replacing furnace bottom air leakage of power station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711090447.2A CN107906549B (en) | 2017-11-08 | 2017-11-08 | System for reducing exhaust gas temperature of air preheater by replacing furnace bottom air leakage of power station boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107906549A CN107906549A (en) | 2018-04-13 |
| CN107906549B true CN107906549B (en) | 2024-01-30 |
Family
ID=61842708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711090447.2A Active CN107906549B (en) | 2017-11-08 | 2017-11-08 | System for reducing exhaust gas temperature of air preheater by replacing furnace bottom air leakage of power station boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107906549B (en) |
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| GB1133923A (en) * | 1966-01-06 | 1968-11-20 | Hans Escher | Gas extraction system for open top shaft furnaces |
| US4774908A (en) * | 1987-05-29 | 1988-10-04 | Westinghouse Electric Corp. | Dry ash handling system |
| CN2869591Y (en) * | 2005-11-10 | 2007-02-14 | 上海巴柯科技发展有限公司 | Jet-bed air-water combined sluge-cooling apparatus |
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| WO2009113498A1 (en) * | 2008-03-12 | 2009-09-17 | 株式会社Ihi | Boiler equipment and method for operating the same |
| CN101699166A (en) * | 2009-11-16 | 2010-04-28 | 上海交通大学 | Bottom air spout set of tangentially-fired coal-burning boiler |
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| RU2010143464A (en) * | 2010-10-25 | 2012-04-27 | Сергей Иванович Ивандаев (RU) | METHOD FOR REMOVING SOLID SLAGS FROM COAL BOILER AND EXTRACTION FROM THEM METALS AND DEVICE FOR ITS IMPLEMENTATION |
| CN104832930A (en) * | 2015-03-13 | 2015-08-12 | 国电科学技术研究院 | Slag cooling device applicable to dry slag discharge machines and application thereof |
| CN105020726A (en) * | 2015-07-28 | 2015-11-04 | 南京电力设备质量性能检验中心 | Device for recovering hot air of dry type slag removal machine and reducing disorganized air leakage of bottom of hearth and application thereof |
| CN205481050U (en) * | 2016-01-21 | 2016-08-17 | 褚双林 | To treatment system who leaks out at bottom of dry slag -tap furnace of boiler forced air cooling |
| CN106195986A (en) * | 2016-08-28 | 2016-12-07 | 华电电力科学研究院 | W flame boiler waste heat utilization system with furnace bottom hot blast |
| CN207514957U (en) * | 2017-11-08 | 2018-06-19 | 上海锅炉厂有限公司 | Station boiler displacement furnace bottom leak out reduce air preheater exhaust gas temperature system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20061010A1 (en) * | 2006-05-23 | 2007-11-24 | Magaldi Power Spa | COOLING SYSTEM FOR DRY EXTRACTION OF HEAVY ASH FOR BOILERS DURING THE HOPPER STORAGE PHASE |
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Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1133923A (en) * | 1966-01-06 | 1968-11-20 | Hans Escher | Gas extraction system for open top shaft furnaces |
| US4774908A (en) * | 1987-05-29 | 1988-10-04 | Westinghouse Electric Corp. | Dry ash handling system |
| CN2869591Y (en) * | 2005-11-10 | 2007-02-14 | 上海巴柯科技发展有限公司 | Jet-bed air-water combined sluge-cooling apparatus |
| CN101008492A (en) * | 2006-01-24 | 2007-08-01 | 北京国电富通科技发展有限责任公司 | Dry slag-draining device of coal boiler |
| WO2009113498A1 (en) * | 2008-03-12 | 2009-09-17 | 株式会社Ihi | Boiler equipment and method for operating the same |
| CN101699166A (en) * | 2009-11-16 | 2010-04-28 | 上海交通大学 | Bottom air spout set of tangentially-fired coal-burning boiler |
| RU2010143464A (en) * | 2010-10-25 | 2012-04-27 | Сергей Иванович Ивандаев (RU) | METHOD FOR REMOVING SOLID SLAGS FROM COAL BOILER AND EXTRACTION FROM THEM METALS AND DEVICE FOR ITS IMPLEMENTATION |
| CN202040832U (en) * | 2011-04-19 | 2011-11-16 | 山东电力研究院 | Connecting system of regenerative air preheater air leakage recycling device and dry-type slag removal machine |
| CN202182479U (en) * | 2011-07-14 | 2012-04-04 | 内蒙古大唐国际托克托发电有限责任公司 | Adjustable ventilation adjustment device for cooling hole of dry-type slag extractor |
| CN104832930A (en) * | 2015-03-13 | 2015-08-12 | 国电科学技术研究院 | Slag cooling device applicable to dry slag discharge machines and application thereof |
| CN105020726A (en) * | 2015-07-28 | 2015-11-04 | 南京电力设备质量性能检验中心 | Device for recovering hot air of dry type slag removal machine and reducing disorganized air leakage of bottom of hearth and application thereof |
| CN205481050U (en) * | 2016-01-21 | 2016-08-17 | 褚双林 | To treatment system who leaks out at bottom of dry slag -tap furnace of boiler forced air cooling |
| CN106195986A (en) * | 2016-08-28 | 2016-12-07 | 华电电力科学研究院 | W flame boiler waste heat utilization system with furnace bottom hot blast |
| CN207514957U (en) * | 2017-11-08 | 2018-06-19 | 上海锅炉厂有限公司 | Station boiler displacement furnace bottom leak out reduce air preheater exhaust gas temperature system |
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| Publication number | Publication date |
|---|---|
| CN107906549A (en) | 2018-04-13 |
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