CN203082914U - Air preheating device of power plant boiler - Google Patents
Air preheating device of power plant boiler Download PDFInfo
- Publication number
- CN203082914U CN203082914U CN2013200360991U CN201320036099U CN203082914U CN 203082914 U CN203082914 U CN 203082914U CN 2013200360991 U CN2013200360991 U CN 2013200360991U CN 201320036099 U CN201320036099 U CN 201320036099U CN 203082914 U CN203082914 U CN 203082914U
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- air
- preheater
- air channel
- power plant
- hot blast
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- 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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Abstract
Provided is an air preheating device of a power plant boiler. The air preheating device of the power plant boiler comprises a rotary air preheater and a partial hot air recirculating device. The partial hot air recirculating device comprises a side air duct, a hot air recirculating fan, a side air duct stop valve and a side air duct valve. An air inlet of the side air duct is connected with a hot air outlet air duct of the rotary air preheater. An air outlet of the side air duct is connected with a cold air inlet air duct of the rotary air preheater. The hot air recirculating fan, the side air duct stop valve and the side air duct valve are all installed inside the side air duct. Due to the facts that the partial hot air recirculating device is arranged on the rotary air preheater in an added mode, and the wall surface temperature of the cold end heating surface of the air preheater is controlled to be in a reasonable range through a mode of increasing the temperature of cold air, the air preheating device of the power plant boiler has the advantages of reducing low-temperature corrosion and dust accumulation, prolonging the service life of the air preheater, enlarging the application range of boiler load, being incapable of increasing the air quantity of an inlet of a fan, and thereby avoiding increase of power consumption of the fan.
Description
Technical field
The utility model relates to the device that a kind of heat that utilizes boiler tail flue gas comes the heating flame required air, belongs to technical field of heating.
Background technology
Air preheater is to utilize the heat of boiler tail flue gas to come the heat-exchange apparatus of heating flame required air.Air preheater is installed in boiler tail, after entering the flue gas of air preheater and air and carrying out heat exchange, has reclaimed the heat of flue gas, has reduced exhaust gas temperature, thereby has improved boiler efficiency; Because air is preheated the broken and grinding that helps fuel, also strengthen catching fire and combustion process of fuel simultaneously simultaneously, reduced the non-complete combustion of fuel heat loss, further improved boiler efficiency.
Yet when existing air preheater moved, corrosion and clogging phenomenon usually appearred in its low-temperature zone, have had a strong impact on the economy and the security of boiler operatiopn.The effective way that prevents the air preheater cold end corrosion is to improve exhaust gas temperature, though improve exhaust gas temperature corrosion is alleviated, and has but increased heat loss due to exhaust gas, and the boiler economy is reduced.
Although the flue gas bulk temperature of many equipment exhaustings is higher than dew-point temperature, equipment still is corroded.Even this is because exhaust gas temperature is higher than dew-point temperature, if the local wall temperature of air preheater fume side heating surface is lower than dew-point temperature, flue gas will dewfall cause corrosion when flowing through herein so.
The way that modern unit is all taked to improve air preheater intake air temperature solves the cold end corrosion problem, promptly between pressure fan and primary air fan outlet and air preheater steam air heater or hot blast EGR is installed.Steam air heater is to utilize extracted steam from turbine to heat cold wind, and air themperature is raise after 30 ℃ ~ 50 ℃, sends into air preheater again.In case the shortcoming of this method is a steam air heater to be damaged and can only be in the unit outage time just can change during long or overhaul, therefore, must do operation well and safeguard, must not make the long-term off-the-line of steam air heater because of equipment deficiency, cause the air preheater cold end corrosion.The hot blast EGR will send back to the inlet of pressure fan from the hot blast that air preheater outlet is drawn, and these hot blasts and the air preheater of flowing through again after cold air mixes improve air preheater low-temperature zone heating surface wall surface temperature with this, prevent cold end corrosion.But the fans entrance air quantity is increased, thereby the blower fan power consumption is increased, and along with the increase of hot blast recirculation volume, the power consumption of blower fan sharply increases, and also wants greatly when energy the loss-rate that this method caused adopts steam air heater.When rotating, the rotary regenerative air preheater heating surface of lattice-shaped can bring the part dust into air side.Will certainly cause blower fan to move under the operating mode of dust-laden when adopting hot blast recirculation, as not taking the abrasionproof measure, the service life of blower fan will reduce greatly.In addition, along with the increase of unit capacity, there is certain difficulty in the air channel of hot blast recirculation on arranging.
Therefore, how to avoid the boiler of power plant air preheater cold end corrosion and grey stifled to occur, improve the equipment reliability of operation and also cut down the consumption of energy, be the difficult problem that the relevant technologies personnel are faced always.
The utility model content
The purpose of this utility model is the drawback at prior art, and a kind of simple in structure, arrangement convenience, reliable and boiler of power plant air preheater that energy consumption is low are provided.
Problem described in the utility model realizes with following technical proposals:
A kind of boiler of power plant air preheater, it comprises rotary regenerative air preheater and part hot blast EGR, described part hot blast EGR comprises bypass air channel, hot blast recirculation blower, bypass air channel cut-off gate and bypass air channel valve, the air inlet in described bypass air channel and air outlet take back the hot-blast outlet air channel and the cold air inlet air channel of rotatable air preheater respectively, and described hot blast recirculation blower, bypass air channel cut-off gate and bypass air channel valve are installed in the bypass air channel.
Above-mentioned boiler of power plant air preheater, described bypass air channel valve is provided with two, and they are installed in before the inlet of hot blast recirculation blower respectively and after the outlet.
Above-mentioned boiler of power plant air preheater, described bypass air channel cut-off gate also is provided with two, and they are installed in before the inlet of hot blast recirculation blower respectively and after the outlet.
The utility model has been set up part hot blast EGR on rotary regenerative air preheater, by the mode that improves the cold wind temperature air preheater cold junction heating surface wall surface temperature is controlled in the reasonable scope, cold end corrosion and dust stratification have not only been alleviated, prolonged the service life of air preheater, enlarged boiler load accommodation, and can not increase the fans entrance air quantity, thereby avoided the increase of blower fan power consumption.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1～Fig. 3 is the connection diagram of three kinds of rotary regenerative air preheaters and part hot blast EGR;
Fig. 4 is the side view of Fig. 1～Fig. 3.
Each list of reference numerals is among the figure: 1, air preheater, 2, the hot-blast outlet air channel, 3, the cold air inlet air channel, 4, bypass air channel, 5, bypass air channel cut-off gate, 6, bypass air channel valve, 7, hot blast recirculation blower, 8, exhaust gases passes, 9, seal area, 10, air duct, 11, air duct is cut apart baffle plate, and 12, part hot blast EGR, 13, the rotor center axle, 14, wind passage, 15, secondary air channel.
The specific embodiment
The utility model is in conjunction with the operating problem of power plant's rotary regenerative air preheater, proposition is drawn hot blast from air preheater hot-blast outlet air channel, and send back to air preheater cold junction cold air inlet air channel and mix with cold air, improve air preheater low-temperature end heating surface wall surface temperature by the mode that improves the cold wind temperature, make it be higher than the acid dew-point temperature of flue gas.Can reach like this and alleviate cold end corrosion of air preheater cold junction heating surface and stifled ash, prolong the air preheater purpose in service life.The utility model can come the maximum of determining section hot blast EGR to recycle air quantity according to the capacity of actual set and the actual motion environment of unit; Simultaneously can be according to boiler load in the unit running process, sulfur content in fuel, the recirculation hot blast rate is regulated in the variation of air themperature etc., and control cold junction heating surface wall surface temperature reaches the purpose that alleviates cold end corrosion and dust stratification in the reasonable scope.
Embodiment 1: be partitioned into the sub-fraction sector region by the rotary regenerative air preheater air duct and be used for mounting portion hot blast EGR.The area of sector region can be determined according to the actual motion environment of unit capacity and unit.Referring to Fig. 1, Fig. 4, between the hot-blast outlet air channel 2 of air preheater 1 and cold air inlet air channel 3, be provided with bypass air channel 4, bypass air channel cut-off gate 5, bypass air channel valve 6 and hot blast recirculation blower 7 are installed on bypass air channel 4.Hot blast recirculation blower 7 is sent to the part hot blast at 2 places, hot-blast outlet air channel of air preheater 1 at 3 places, cold air inlet air channel of air preheater 1, form the recirculation of part hot blast, with this wall temperature that improves 1 cold section heating surface of air preheater, make it be higher than acid dew point.When boiler load, sulfur content in fuel, air themperature etc. change, can control the recirculation hot blast rate by the aperture of adjusting bypass air channel valve 6, reach control air preheater 1 cold junction heating surface wall temperature, alleviate the purpose of cold end corrosion.Also can select to close bypass air channel cut-off gate 5 after ambient air temperature surpasses certain value, stoppage in transit hot blast recirculation blower 7 is saved the blower fan power consumption.
Embodiment 2: referring to Fig. 2, Fig. 3, Fig. 4, to trisector air heater, by the wind passage 14(or the secondary air channel 15 of rotary regenerative air preheater cold junction) be partitioned into the sub-fraction fan section and be used for mounting portion hot blast EGR 12.
The utility model adopts the mode of part hot blast recirculation can effectively improve the wall temperature of air preheater cold junction heating surface, makes it be higher than flue gas acid dew point.Can reach when the cold junction heating surface contacts with flue gas and alleviate cold end corrosion and stifled ash, prolong the air preheater purpose in service life.
Except that above-mentioned embodiment, the utility model can also have other embodiment, all any modifications of being made on the utility model basis, is equal to replacement etc. and all should be included within the protection domain that the utility model requires.
Claims (3)
1. boiler of power plant air preheater, it is characterized in that, it comprises rotary regenerative air preheater (1) and part hot blast EGR (12), described part hot blast EGR (12) comprises bypass air channel (4), hot blast recirculation blower (7), bypass air channel cut-off gate (5) and bypass air channel valve (6), the air inlet in described bypass air channel (4) and air outlet take back hot-blast outlet air channel (2) and cold air inlet air channel (3) of rotatable air preheater (1), described hot blast recirculation blower (7) respectively, bypass air channel cut-off gate (5) and bypass air channel valve (6) are installed in the bypass air channel (4).
2. a kind of boiler of power plant air preheater according to claim 1 is characterized in that described bypass air channel valve (6) is provided with two, and they are installed in before the inlet of hot blast recirculation blower (7) respectively and after the outlet.
3. a kind of boiler of power plant air preheater according to claim 1 and 2 is characterized in that described bypass air channel cut-off gate (5) also is provided with two, and they are installed in before the inlet of hot blast recirculation blower (7) respectively and after the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200360991U CN203082914U (en) | 2013-01-22 | 2013-01-22 | Air preheating device of power plant boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200360991U CN203082914U (en) | 2013-01-22 | 2013-01-22 | Air preheating device of power plant boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203082914U true CN203082914U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013200360991U Expired - Fee Related CN203082914U (en) | 2013-01-22 | 2013-01-22 | Air preheating device of power plant boiler |
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| CN (1) | CN203082914U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949149A (en) * | 2015-06-29 | 2015-09-30 | 南京博沃科技发展有限公司 | Rotary air preheater dust-blocking-prevention synergy sealing method and system |
| CN105042623A (en) * | 2015-08-18 | 2015-11-11 | 德清金烨电力科技有限公司 | Air pre-heater |
| CN105864817A (en) * | 2016-05-06 | 2016-08-17 | 华电电力科学研究院 | System and method for preventing AH blockage and heat exchange surface corrosion by hot secondary air supercharged countercurrent |
| CN105864816A (en) * | 2016-05-06 | 2016-08-17 | 华电电力科学研究院 | System and method for inhibiting AH blockage due to ABS solidification through hot primary air countercurrent circulation |
| CN106546124A (en) * | 2016-11-04 | 2017-03-29 | 国家电网公司 | A kind of anti-blocking apparatus for ash of circulated air and rotary regenerative air preheater |
| CN107191963A (en) * | 2017-07-10 | 2017-09-22 | 东方电气集团东方锅炉股份有限公司 | A kind of method that rotary regenerative air preheater and the anti-ammonium hydrogen sulfate of the rotary regenerative air preheater are blocked |
| CN107559876A (en) * | 2017-09-04 | 2018-01-09 | 孙孝禹 | The reduction of rotary regenerative air preheater is leaked out anti-blocking ash system and method |
| CN107726356A (en) * | 2017-11-21 | 2018-02-23 | 杭州新际能源科技有限公司 | More points of storehouse self-cleaning corrosion-and blocking-prevention rotary regenerative air preheaters |
| CN107726355A (en) * | 2017-09-11 | 2018-02-23 | 大唐东北电力试验研究所有限公司 | Rotary regenerative air preheater and its First air side subtract the obstruction-proof method that leaks out |
| CN108534172A (en) * | 2018-05-10 | 2018-09-14 | 中国计量大学 | For preventing the system that deposit blocks in rotary regenerative air preheater |
| CN113803706A (en) * | 2021-09-23 | 2021-12-17 | 上海理工大学 | Power generation system based on hot air recycling utilizes boiler afterbody flue gas waste heat |
-
2013
- 2013-01-22 CN CN2013200360991U patent/CN203082914U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949149A (en) * | 2015-06-29 | 2015-09-30 | 南京博沃科技发展有限公司 | Rotary air preheater dust-blocking-prevention synergy sealing method and system |
| CN105042623A (en) * | 2015-08-18 | 2015-11-11 | 德清金烨电力科技有限公司 | Air pre-heater |
| CN105864816B (en) * | 2016-05-06 | 2018-08-07 | 华电电力科学研究院 | Heat primary air circulated in countercurrent inhibits the system and method for ABS frozen plugs AH |
| CN105864816A (en) * | 2016-05-06 | 2016-08-17 | 华电电力科学研究院 | System and method for inhibiting AH blockage due to ABS solidification through hot primary air countercurrent circulation |
| CN105864817A (en) * | 2016-05-06 | 2016-08-17 | 华电电力科学研究院 | System and method for preventing AH blockage and heat exchange surface corrosion by hot secondary air supercharged countercurrent |
| CN105864817B (en) * | 2016-05-06 | 2018-08-07 | 华电电力科学研究院 | The anti-AH of hot Secondary Air supercharging adverse current is blocked and heat-transfer surface etching system and its method |
| CN106546124A (en) * | 2016-11-04 | 2017-03-29 | 国家电网公司 | A kind of anti-blocking apparatus for ash of circulated air and rotary regenerative air preheater |
| CN107191963A (en) * | 2017-07-10 | 2017-09-22 | 东方电气集团东方锅炉股份有限公司 | A kind of method that rotary regenerative air preheater and the anti-ammonium hydrogen sulfate of the rotary regenerative air preheater are blocked |
| CN107559876A (en) * | 2017-09-04 | 2018-01-09 | 孙孝禹 | The reduction of rotary regenerative air preheater is leaked out anti-blocking ash system and method |
| CN107726355A (en) * | 2017-09-11 | 2018-02-23 | 大唐东北电力试验研究所有限公司 | Rotary regenerative air preheater and its First air side subtract the obstruction-proof method that leaks out |
| CN107726356A (en) * | 2017-11-21 | 2018-02-23 | 杭州新际能源科技有限公司 | More points of storehouse self-cleaning corrosion-and blocking-prevention rotary regenerative air preheaters |
| CN108534172A (en) * | 2018-05-10 | 2018-09-14 | 中国计量大学 | For preventing the system that deposit blocks in rotary regenerative air preheater |
| CN113803706A (en) * | 2021-09-23 | 2021-12-17 | 上海理工大学 | Power generation system based on hot air recycling utilizes boiler afterbody flue gas waste heat |
| CN113803706B (en) * | 2021-09-23 | 2024-04-19 | 上海理工大学 | Power generation system based on hot air recycling and utilizing waste heat of tail flue gas of boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20170122 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |