CN110397947A - A kind of air preheater is anti-blocking and enhances heat transfer unit (HTU) - Google Patents

A kind of air preheater is anti-blocking and enhances heat transfer unit (HTU) Download PDF

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Publication number
CN110397947A
CN110397947A CN201910604793.0A CN201910604793A CN110397947A CN 110397947 A CN110397947 A CN 110397947A CN 201910604793 A CN201910604793 A CN 201910604793A CN 110397947 A CN110397947 A CN 110397947A
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CN
China
Prior art keywords
air duct
air
import
air preheater
duct
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Pending
Application number
CN201910604793.0A
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Chinese (zh)
Inventor
彭永强
郑丙文
刘良华
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Hunan Datang Energy-Saving Science & Technology Co Ltd
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Hunan Datang Energy-Saving Science & Technology Co Ltd
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Application filed by Hunan Datang Energy-Saving Science & Technology Co Ltd filed Critical Hunan Datang Energy-Saving Science & Technology Co Ltd
Priority to CN201910604793.0A priority Critical patent/CN110397947A/en
Publication of CN110397947A publication Critical patent/CN110397947A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING 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
    • F23L15/00Heating of air supplied for combustion
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)
  • Chimneys And Flues (AREA)

Abstract

The invention discloses a kind of air preheater it is anti-blocking and enhancing heat transfer unit (HTU), including surface-type heat exchanger, exhaust gases passes and air duct are provided in the surface-type heat exchanger, the import of the exhaust gases passes is connected to by import branch flue with the inlet flue duct of air preheater, and the outlet of the exhaust gases passes is connected to by exporting branch flue with the exhaust pass of air preheater;The import of the air duct is connected to import air duct, and the outlet of the air duct is connected to outlet conduits;Further include the serial air duct for being connected to the outlet conduits Yu the cold air duct, and the parallel air duct of the connection outlet conduits and the hot air duct, is respectively arranged with first baffle door and second baffle door on the serial air duct and parallel air duct.The device can switch to serial, parallel or string and hybrid mode, can improve air preheater inlet air temperature and cold side metal temperature, prevention and the stifled ash of control air preheater, improve air preheater heat exchange element clean-up performance, and reduce exhaust gas temperature, improve boiler efficiency.

Description

A kind of air preheater is anti-blocking and enhances heat transfer unit (HTU)
Technical field
The invention belongs to residual heat from boiler fume to utilize technical field, and in particular to a kind of air preheater is anti-blocking and enhancing heat transfer fills It sets.
Background technique
Rotary regenerative air heater is widely used in the apparatus of thermo-electric power boiler of 200MW or more capacitance grade, is a upper and lower opening Big drum, inside are intensively provided with cooling fin, and flue gas flows from above to below, and the heat carried is absorbed by cooling fin, heat Cooling fin afterwards moves to air side with the slow rotation of air preheater;Air flows from bottom to top, absorbs the heat of cooling fin Certain temperature is preheated to after amount.Wherein, air preheater upper end flue gas and air themperature are high, referred to as hot end, lower end flue gas and air Temperature is low, referred to as cold end.
Air preheater cold-end air integrated temperature is that air preheater exports the sum of smoke temperature (i.e. exhaust gas temperature) and import cold wind temperature. Under boiler at low load and low ambient temperature, air preheater cold-end air integrated temperature is relatively low, and cold side metal temperature is revealed lower than flue gas Point, i.e. SO in flue gas3The adiabatic condensation temperature of the sulfuric acid vapor formed with vapor, causes sulfuric acid vapor to condense in air preheater On heating surface and back-end ductwork, the flying dust in flue gas is adhered to, causes cold end low-temperature corrosion, stifled ash.
In addition, denitrating flue gas is based on selective catalytic reduction (SCR) technology at present, to guarantee SCR denitration efficiency, it is necessary to Make ammonia that there is certain excess coefficient, forms escape ammonia.As flue-gas temperature reduces to a certain extent, in escape ammonia and flue gas SO3Reaction generates the ammonium hydrogen sulfate of strong cohesive property, is adhered on air preheater heat exchange element, and bond flying dust, causes air preheater Blocking.
The stifled ash of air preheater has many hazards: on the one hand, causing the reduction of heat exchange element cleannes, heat transfer effect is deteriorated, leads Boiler efficiency is caused to reduce;On the other hand, the power consumption for increasing blower may be forced limited load very because of blower surplus deficiency when serious To stoppage in transit.
To solve this problem, traditional method is thermal wind sensor, by empty from air preheater hot air duct extracting high-temperature Gas flows back into the mode of fresh air inlet (FAI, improves the cold end integrated temperature for entering air preheater, but because of rotary regenerative air heater class It is similar to meromict formula heat exchanger, outlet hot wind dustiness is high, and thermal wind sensor mode will cause fan blade abrasion, causes important The damage of equipment, while big air-side blockage will also result in air preheater cooling condition variation, and exhaust gas temperature increases, boiler fortune Row is less economical.
Part power plant has carried out steam warming machine transformation to boiler, installs steam air heater on air preheater import cold wind air duct, Heat source comes from extracted steam from turbine, and air preheater cold end integrated temperature can be improved under winter condition.But it will lead to exhaust gas temperature liter High, extracted steam from turbine acting capacity loss, duct resistance increase etc., cause the reduction of unit performance driving economy.
Still an alternative is that carrying out the transformation of fume afterheat steam air heater, warm wind is installed on air preheater import cold wind air duct Device installs gas cooler on air preheater exhaust pass, is recycled using enclosed heat medium water by steam air heater and gas cooler string Row together, realizes flue gas indirect heating air, improves air preheater cold end integrated temperature.Such steam air heater system can be thrown for a long time Fortune will not improve exhaust gas temperature, but because being all serially mounted with heat exchanger in air duct and flue, air side and fume side resistance Power all increases, and causes biggish drag losses, increases blower power consumption.Although on the other hand air preheater corrosion and dust stratification situation change It is kind, but the gas cooler corrosion after air preheater is difficult to avoid that with dust stratification.
Summary of the invention
On solving the problems such as air preheater burn into is stifled grey, existing method is difficult to take into account improvement and economy, is gram Take this defect, the present invention provides that a kind of air preheater is anti-blocking and enhancing heat transfer unit (HTU).Specific embodiment is as follows:
The device includes surface-type heat exchanger, import branch flue, outlet branch flue, import air duct, outlet conduits, serial wind Road and parallel air duct;
Exhaust gases passes and air duct are provided in the surface-type heat exchanger, the import of the exhaust gases passes passes through described Import branch flue is connected to the inlet flue duct of air preheater, and the outlet of the exhaust gases passes passes through the outlet branch flue and air preheater Exhaust pass connection;The import of the air duct is connected to the import air duct, the outlet of the air duct with it is described Outlet conduits connection;
The serial air duct, for being connected to the cold air duct of the outlet conduits Yu the air preheater, the serial air duct On be provided with first baffle door;
The parallel air duct, for being connected to the hot air duct of the outlet conduits Yu the air preheater, the parallel air duct On be provided with second baffle door.
Preferably, it is provided with third baffle door on the import branch flue, is provided with fourth gear on the outlet branch flue Plate door, the third baffle door and the fourth gear plate door are adjustable type baffle door.
Preferably, the first baffle door and the second baffle door are adjustable type baffle door.
Preferably, the import branch flue, outlet branch flue, import air duct, be provided with temperature point on outlet conduits And pressure-measuring-point.
Preferably, booster fan is provided on the import air duct.
Preferably, ash bucket is provided between the import branch flue and the inlet flue duct of the air preheater.
Preferably, the surface-type heat exchanger is plate heat exchanger.
One embodiment of the present invention the utility model has the advantages that
Increase surface-type heat exchanger in air preheater fume side, cold air can be via serial after surface-type heat exchanger heating The cold air duct of air preheater import is sent into air duct, and the hot air duct of air preheater outlet can also be sent into via parallel air duct, passes through control The opening and closing for making the second baffle door on the first baffle door and parallel air duct on serial air duct, can switch to it is serial, parallel or String and hybrid mode are run using parallel mode in unit high load capacity, high environment temperature operating condition, reduce exhaust gas temperature and air preheater Air-side blockage, improve unit performance driving economy;Unit underload, low ambient temperature operating condition use serial mode, improve empty Pre- device cold side metal temperature, prevents cold end corrosion dust stratification and ammonium hydrogen sulfate bonded deposit, selection string and the side of mixing when intermediate operating condition Formula is optimal operational effect.This programme can effectively improve air preheater inlet air temperature and cold side metal temperature, prevention and control The stifled ash of air preheater, improves air preheater heat exchange element clean-up performance, and reduce exhaust gas temperature, improves boiler efficiency.
Detailed description of the invention
Fig. 1 is the apparatus structure schematic diagram of one embodiment of the present invention;
Fig. 2 is the apparatus structure schematic diagram of another embodiment of the present invention;
In figure: 1- pressure fan;2- cold air duct;3- air preheater;4- hot air duct;5- inlet flue duct;6- exhaust pass;7- Surface-type heat exchanger;8- import branch flue;9- ash bucket;10- third baffle door;11- exports branch flue;12- fourth gear plate door; 13- booster fan;14- import air duct;15- outlet conduits;The serial air duct 16-;17- first baffle door;The parallel air duct 18-;19- Second baffle door;20- air supply tube.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Therefore, below to the embodiment of the present invention provided in the accompanying drawings Detailed description be not intended to limit the range of claimed invention, but be merely representative of selected embodiment of the invention.
In the description of the present invention, greater than etc. be interpreted as not including this number, be interpreted as including this number with first-class, first, Two, third, the 4th are only intended to for the purpose of distinguishing technical characteristic, are not understood to indicate or imply relative importance or hidden Containing the quantity for indicating indicated technical characteristic or implicitly indicate the precedence relationship of indicated technical characteristic.
Air preheater as shown in Figure 1 is anti-blocking and enhances heat transfer unit (HTU), and a surface-type heat exchanger 7 is arranged beside air preheater 3. Cold air is entered by air supply tube 20, is pressurizeed through pressure fan 1, then enters air preheater 3 from bottom to top through cold air duct 2, is heated liter Wen Houcong hot air duct 4 is expelled to boiler;High-temperature flue gas enters air preheater 3 through inlet flue duct 5 from top to bottom, is cooled after cooling It is discharged through exhaust pass 6.
Exhaust gases passes and air duct are provided in surface-type heat exchanger 7.The import of exhaust gases passes passes through import branch flue 8 It is connected to the inlet flue duct 5 of air preheater 3, the exhaust pass 6 that the outlet of the exhaust gases passes passes through outlet branch flue 11 and air preheater 3 Connection.The import of air duct is connected to import air duct 14, and the outlet of air duct is connected to outlet conduits 15.In import branch cigarette Expansion joint (not shown) is set on road 8, outlet branch flue 11, import air duct 14 and outlet conduits 15.
It further include serial air duct 16 and parallel air duct 18, wherein serial 16 one end of air duct is connected to outlet conduits 15, the other end It is connected to the cold air duct 2 of air preheater 3, is provided with first baffle door 17 on serial air duct 16.Parallel air duct 18, one end connection outlet Air duct 15, the other end are connected to the hot air duct 4 of air preheater 3, are provided with second baffle door 19 on parallel air duct 18.Pass through control the The opening and closing of one baffle door 17 and second baffle door 19 can switch to serial, parallel or string and hybrid mode.Due to be provided with into Mouth branch flue 8 shunts the flue gas of inlet flue duct 5, reduces the resistance of 3 fume side of air preheater.In unit high load capacity, height Ambient temperature conditions can be used parallel mode operation, and be heated by surface-type heat exchanger 7 to air, the sky after heating Gas is sent directly into the hot air duct 4 of the outlet of air preheater 3, can reduce exhaust gas temperature and the air-side blockage with air preheater 3, improves machine Group performance driving economy;It is run in underload, low ambient temperature operating condition using serial mode, the air after heating is sent directly into empty pre- The cold air duct 2 of 3 import of device improves 3 cold side metal temperature of air preheater, prevents cold end corrosion dust stratification and ammonium hydrogen sulfate bonding product Ash.Selection string and hybrid mode, are optimal operational effect when intermediate operating condition.This programme can effectively improve the air inlet of air preheater 3 Temperature and cold side metal temperature, prevention and the stifled ash of control air preheater 3, improve 3 heat exchange element clean-up performance of air preheater, moreover it is possible to reduce Exhaust gas temperature improves boiler efficiency.
Third baffle door 10 is arranged in preferable embodiment on import branch flue 8, exports and the 4th is arranged on branch flue 11 Baffle door 12, first to fourth baffle door are that adjustable type baffle door can be according to the actual situation by adjusting each baffle opening Change flue gas and air mass flow distribution, adjusts 3 cold side metal temperature of air preheater.For this purpose, can also be in import branch flue 8, outlet Branch flue 11, import air duct 14 are respectively provided with temperature point (not shown) on outlet conduits 15 and pressure-measuring-point (does not show in figure Out).
In practical applications, due in fire coal boiler fume flying dust concentration it is big, the strong burned-coal fly ash particle of part coking capacity Degree is big, and 3 heat exchange element of air preheater is the corrugated plating intensively arranged, low-temperature corrosion dust stratification occurs for cold end or hydrogen sulfate occurs for middle section When ammonium is hardened, bulky grain flying dust be difficult to it is smooth pass through, aggravate blocking process.Therefore in the import of import branch flue 8 and air preheater 3 It is provided with ash bucket 9 between flue 5, using gravity and inertial separation principle, bulky grain soot particle is separated from flue gas, is delayed With the blocking for mitigating air preheater 3.Surface-type heat exchanger 7 is usually tubular type or plate heat exchanger, preferably plate heat exchanger, flue gas Smooth no setback on channel, and plate spacing is greater than 3 fin gap of air preheater, is not easy stifled ash.
In the present embodiment, be provided with booster fan 13 on import air duct 14, cold air boosted by booster fan 13 after by Import air duct 14 is delivered to surface-type heat exchanger 7, as shown in Figure 1.
Further, it is also possible to import air duct 14 is connected with the cold air duct 2 of air preheater 3, while serial air duct 16 is by sending Air hose 20 is connected to cold air duct 2, as shown in Figure 2.Compared with embodiment shown in FIG. 1, which no setting is required boosting wind Machine 13.
The type of air preheater 3 is not particularly limited in this programme, is applicable to two warehouse separated types or three points of storehouses with first-class more points Import air duct 14 is preferably connected to more warehouse separated type air preheaters by storehouse formula air preheater with the import cool air hose in each point of storehouse.

Claims (7)

1. a kind of air preheater is anti-blocking and enhances heat transfer unit (HTU), it is characterised in that: including surface-type heat exchanger, import branch flue, go out Mouth branch flue, import air duct, outlet conduits, serial air duct and parallel air duct;
Exhaust gases passes and air duct are provided in the surface-type heat exchanger, the import of the exhaust gases passes passes through the import Branch flue is connected to the inlet flue duct of air preheater, the exhaust gases passes outlet by it is described outlet branch flue and air preheater go out Mouth flue connection;The import of the air duct is connected to the import air duct, the outlet of the air duct and the outlet Air duct connection;
The serial air duct is set on the serial air duct for being connected to the cold air duct of the outlet conduits Yu the air preheater It is equipped with first baffle door;
The parallel air duct is set on the parallel air duct for being connected to the hot air duct of the outlet conduits Yu the air preheater It is equipped with second baffle door.
2. air preheater according to claim 1 is anti-blocking and enhances heat transfer unit (HTU), which is characterized in that on the import branch flue It is provided with third baffle door, fourth gear plate door, the third baffle door and the fourth gear are provided on the outlet branch flue Plate door is adjustable type baffle door.
3. air preheater according to claim 1 or 2 is anti-blocking and enhances heat transfer unit (HTU), which is characterized in that the first baffle Door and the second baffle door are adjustable type baffle door.
4. air preheater according to claim 1 is anti-blocking and enhances heat transfer unit (HTU), which is characterized in that the import branch flue, Outlet branch flue, import air duct are provided with temperature point and pressure-measuring-point on outlet conduits.
5. air preheater according to claim 1 is anti-blocking and enhances heat transfer unit (HTU), which is characterized in that set on the import air duct It is equipped with booster fan.
6. air preheater according to claim 1 it is anti-blocking and enhancing heat transfer unit (HTU), which is characterized in that the import branch flue with Ash bucket is provided between the inlet flue duct of the air preheater.
7. air preheater according to claim 1 is anti-blocking and enhances heat transfer unit (HTU), which is characterized in that the surface-type heat exchanger For plate heat exchanger.
CN201910604793.0A 2019-07-05 2019-07-05 A kind of air preheater is anti-blocking and enhances heat transfer unit (HTU) Pending CN110397947A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130061201A (en) * 2011-11-28 2013-06-11 알스톰 테크놀러지 리미티드 Regenerative air preheater design to reduce cold end fouling
CN205717147U (en) * 2016-04-26 2016-11-23 南京电力设备质量性能检验中心 A kind of full load denitration utilizes and air preheater corrosion-and blocking-prevention coupled system with fume afterheat
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
CN109404958A (en) * 2018-11-12 2019-03-01 南京博沃科技发展有限公司 A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue
CN208735652U (en) * 2018-04-20 2019-04-12 江苏峰业科技环保集团股份有限公司 The eliminating white smoke system that a kind of heat exchanger and air preheater combine
CN109945227A (en) * 2019-05-08 2019-06-28 北京国电龙源环保工程有限公司 Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion
CN210801252U (en) * 2019-07-05 2020-06-19 湖南大唐节能科技有限公司 Air preheater prevents stifled and reinforcing heat transfer device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130061201A (en) * 2011-11-28 2013-06-11 알스톰 테크놀러지 리미티드 Regenerative air preheater design to reduce cold end fouling
CN205717147U (en) * 2016-04-26 2016-11-23 南京电力设备质量性能检验中心 A kind of full load denitration utilizes and air preheater corrosion-and blocking-prevention coupled system with fume afterheat
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
CN208735652U (en) * 2018-04-20 2019-04-12 江苏峰业科技环保集团股份有限公司 The eliminating white smoke system that a kind of heat exchanger and air preheater combine
CN109404958A (en) * 2018-11-12 2019-03-01 南京博沃科技发展有限公司 A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue
CN109945227A (en) * 2019-05-08 2019-06-28 北京国电龙源环保工程有限公司 Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion
CN210801252U (en) * 2019-07-05 2020-06-19 湖南大唐节能科技有限公司 Air preheater prevents stifled and reinforcing heat transfer device

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