CN102287912A - Safe and energy-saving air heating device without air duct resistance - Google Patents

Safe and energy-saving air heating device without air duct resistance Download PDF

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Publication number
CN102287912A
CN102287912A CN2011102082661A CN201110208266A CN102287912A CN 102287912 A CN102287912 A CN 102287912A CN 2011102082661 A CN2011102082661 A CN 2011102082661A CN 201110208266 A CN201110208266 A CN 201110208266A CN 102287912 A CN102287912 A CN 102287912A
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China
Prior art keywords
air
cold
air duct
hot
road
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Pending
Application number
CN2011102082661A
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Chinese (zh)
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周利庆
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周利庆
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Priority to CN2011102082661A priority Critical patent/CN102287912A/en
Publication of CN102287912A publication Critical patent/CN102287912A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a safe and energy-saving air heating device without air duct resistance. The device comprises an air preheater, a primary cold air duct, a primary hot air duct, a secondary cold air duct, a secondary hot air duct, a cold flue and a hot flue, wherein an electric heating device for raising an air temperature during the cold start of a boiler is arranged in each of the primary hot air duct and the secondary hot air duct. The device has a reasonable structure, can achieve a more stably and reliably raised inlet air temperature compared with the conventional air heater, prevents the tail part of the boiler from being dewed, corroded or blocked, particularly overcomes the defect of the conventional air heater during use, has a prominent electricity, oil and coal saving effect, and is a technological upgrading project which has small investment, high profit, small maintenance amount and high heating performance and is indispensable to the long-period safe and high-efficiency operation of the boiler.

Description

No air channel resistance energy-saving safe heater
Technical field
The present invention relates to a kind of heater.
Background technology
Large electric power plant unit (more than the 300MW) boiler air and flue system blower fan power consumption accounts for installed capacity about 1%.In same new installation unit air and flue system power consumption and operation air and flue system power consumption contrast after 1 year, difference is very big, and its reason is that the air preheater resistance increases relevant with the steam air heater resistance.The forward and backward parameter comparison of major overhaul, because of the air preheater change in resistance, in the 6000V motor, the air-introduced machine electric current rises to 108/111A from 95/97A; Pressure fan also increases the dirty resistance of steam air heater fin and increases double influence, and the pressure fan electric current rises to 42/44A from 31/33A.The primary air fan electric current increases more than the 10A equally.
Present most of boiler of power plant stops up for preventing the air preheater dewing corrosion, particularly still improve air preheater cold junction mean temperature winter with the steam heating type steam air heater, sulphur composition in the strick precaution flue gas is because of the dirty heat transfer element of dewfall, and air preheater wind and smoke passage is also stopped up in corrosion.They understand, if air preheater stops up because of the low dewing corrosion of cold junction temperature, heat-transfer effect is descended, air leak rate of air curtain increases, its thermal efficiency reduces significantly, and boiler combustion, blower fan (pressure fan, air-introduced machine, primary air fan) electric current increase, and it is limited to exert oneself, generating set coal consumption, power consumption increase, and the steam air heater direct losses are bigger than not coming into operation.
The come into operation negative effect of traditional steam air heater of analysis: the one, steam air heater is operated in the big especially zone of the carbonated drink temperature difference, hydrophobic, insulation many because of pipe bending such as is not good at influence, forming carbonated drink resonance, is to leak main cause winter, finally be isolation processing not and out of service; The 2nd, the obstructed Steam Heating wind-warm syndrome of steam air heater in summer, but winged insect and foreign material obstruction that fin carries because of fans entrance, duct resistance increases severely, and equally blower fan is exerted oneself and the influence of electric current formation.
Summary of the invention
The object of the present invention is to provide a kind of rational in infrastructure, the no air channel resistance energy-saving safe heater that heating properties is good.
Technical solution of the present invention is:
A kind of no air channel resistance energy-saving safe heater, comprise air preheater, a cold air channel, heat primary air road, secondary cold air duct, secondary hot-air road, cold smoke road, heating flue, it is characterized in that: in heat primary air road and secondary hot-air road, be provided for the electric heater unit that boiler cold-state starts the heating wind-warm syndrome.
Between the pressure fan inlet of secondary hot-air road and secondary cold air duct the return airway is set, the diameter of return airway is less than the hot and cold air channel of secondary diameter; Air-valve by the cold wind temperature and the air preheater outlet cold flue gas temperature average decision aperture size of air preheater cold side inlet is set on the return airway.
In the secondary cold air duct and in the cold smoke road, temperature point is set.
The present invention is rational in infrastructure, can obtain than the more reliable and stable heating import of traditional steam air heater wind-warm syndrome, avoid the boiler tail dewing corrosion to stop up, bigger results are to eliminate the deficiency that traditional steam air heater exists in using, and economize on electricity, fuel-economizing, economize on coal that it is outstanding to manifest, and are reduced investments, the income height, maintenance is little, and heating properties is good, is the indispensable technological transformation project of boiler long period safe and highly efficient operation.
The present invention is used for boiler, and normally to move heating blower inlet cold wind be to extract thermal source from air preheater outlet hot-flow flue, thereby avoided the resistance of the steam surface heating steam air heater in the air channel.Add small-bore return airway at air preheater outlet hot-flow flue and pressure fan inlet, the pitch of regulating the wind flow size is housed in the return airway, air preheater inlet air channel and flue are equipped with temperature point respectively, with cold junction wind-warm syndrome, cigarette temperature mean value size decision backflow hot blast pitch size aperture; Also revise in conjunction with coal-fired sulfur content size.When coal-fired sulfur-bearing less than 1.5% the time, the cold junction mean temperature is set 68 ℃.Be that the import wind-warm syndrome adds exhaust gas temperature greater than 136 ℃, can avoid air preheater heating surface dewing corrosion and stop up.When coal-fired sulfur-bearing less than 2%~greater than 1.5% the time, the cold junction mean temperature is set 72 ℃, i.e. import wind-warm syndrome adds exhaust gas temperature and can avoid the smoke condensation corrosion to stop up greater than 144 ℃.Because of boiler fired coal sulfur-bearing uncertainty, sulfur content increases in the coal, and sulfur-containing smoke gas set point temperature is also along with improve, and the cold junction mean temperature is controlled also along with raising.Hot blast recirculation can in time be adjusted setting according to cold junction temperature and coal-fired sulfur-bearing situation, for boiler safety efficiently provides safeguard.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of one embodiment of the invention.
The specific embodiment
A kind of no air channel resistance energy-saving safe heater, comprise air preheater 1, a cold air channel 13, heat primary air road 14, secondary cold air duct 7, secondary hot-air road 8, cold smoke road 9, heating flue 10, in heat primary air road and secondary hot-air road, be provided for the electric heater unit 5,15 that boiler cold-state starts the heating wind-warm syndrome respectively.
Between pressure fan 2 inlets 6 of secondary hot-air road and secondary cold air duct return airway 3 is set, the diameter of return airway is less than the hot and cold air channel of secondary diameter; Air-valve 4 by the cold wind temperature and the air preheater outlet cold flue gas temperature average decision aperture size of air preheater cold side inlet is set on the return airway.
One more blower fan 16. among the figure
In the secondary cold air duct and in the cold smoke road, temperature point 11,12 is set respectively.
When the present invention worked, when the no thermal source of boiler cold-state startup self, heating furnace import wind-warm syndrome was by being installed in each electric heater unit 5(15 of number in the hot-flow flue), heating enters the burner hearth combustion air.When boiler furnace inlet wind-warm syndrome reaches more than 150 ℃, can throw coal dust firing, reduce ignition of the boiler with oily.After treating that boiler throwing powder is normal, the electrical heating wind-warm syndrome device of stopping using changes normal operating mode over to.
Boiler is normally in service, and air-valve 4 aperture sizes are by air preheater cold side inlet (being the secondary cold air duct) cold wind temperature and the decision of air preheater outlet cold flue gas temperature average.The air preheater that makes is operated under the normal temperature control, thereby realizes boiler long period safe and highly efficient operation.Realize boiler economize on electricity, fuel-economizing, economize on coal, the purpose of synergy, cater to current society to the energy-saving and cost-reducing transformation demand of energy consumption equipment.

Claims (3)

1. no air channel resistance energy-saving safe heater, comprise air preheater, a cold air channel, heat primary air road, secondary cold air duct, secondary hot-air road, cold smoke road, heating flue, it is characterized in that: in heat primary air road and secondary hot-air road, be provided for the electric heater unit that boiler cold-state starts the heating wind-warm syndrome.
2. no air channel according to claim 1 resistance energy-saving safe heater is characterized in that: between the pressure fan inlet of secondary hot-air road and secondary cold air duct the return airway is set, the diameter of return airway is less than the hot and cold air channel of secondary diameter; Air-valve by the cold wind temperature and the air preheater outlet cold flue gas temperature average decision aperture size of air preheater cold side inlet is set on the return airway.
3. no air channel according to claim 1 and 2 resistance energy-saving safe heater is characterized in that: in the secondary cold air duct and in the cold smoke road temperature point is set.
CN2011102082661A 2011-07-25 2011-07-25 Safe and energy-saving air heating device without air duct resistance Pending CN102287912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011102082661A CN102287912A (en) 2011-07-25 2011-07-25 Safe and energy-saving air heating device without air duct resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011102082661A CN102287912A (en) 2011-07-25 2011-07-25 Safe and energy-saving air heating device without air duct resistance

Publications (1)

Publication Number Publication Date
CN102287912A true CN102287912A (en) 2011-12-21

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CN2011102082661A Pending CN102287912A (en) 2011-07-25 2011-07-25 Safe and energy-saving air heating device without air duct resistance

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102829486A (en) * 2012-09-25 2012-12-19 中国东方电气集团有限公司 System for increasing the temperature of secondary air at inlet of air pre-heater
CN103868054A (en) * 2014-04-04 2014-06-18 四川电力建设三公司 Boiler starting speed increasing and oil-saving arrangement structure for heat power station and method for rapidly starting boiler

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106831A (en) * 2000-09-28 2002-04-10 Ishikawajima Harima Heavy Ind Co Ltd Pulverized coal fired boiler facility
CN2909035Y (en) * 2006-05-22 2007-06-06 艾佩克斯科技(北京)有限公司 Duct heating system
CN201262408Y (en) * 2008-07-25 2009-06-24 西安热工研究院有限公司 Hot primary air bypass apparatus of coal-burning boiler
CN101709882A (en) * 2009-12-09 2010-05-19 西安热工研究院有限公司 Coal-fired boiler hot primary wind heating system
CN102095196A (en) * 2011-03-08 2011-06-15 张全胜 Oilless ignition method of fluidized bed boiler
CN202216393U (en) * 2011-07-25 2012-05-09 周利庆 Air-passage-resistance-free safe energy-saving air heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106831A (en) * 2000-09-28 2002-04-10 Ishikawajima Harima Heavy Ind Co Ltd Pulverized coal fired boiler facility
CN2909035Y (en) * 2006-05-22 2007-06-06 艾佩克斯科技(北京)有限公司 Duct heating system
CN201262408Y (en) * 2008-07-25 2009-06-24 西安热工研究院有限公司 Hot primary air bypass apparatus of coal-burning boiler
CN101709882A (en) * 2009-12-09 2010-05-19 西安热工研究院有限公司 Coal-fired boiler hot primary wind heating system
CN102095196A (en) * 2011-03-08 2011-06-15 张全胜 Oilless ignition method of fluidized bed boiler
CN202216393U (en) * 2011-07-25 2012-05-09 周利庆 Air-passage-resistance-free safe energy-saving air heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102829486A (en) * 2012-09-25 2012-12-19 中国东方电气集团有限公司 System for increasing the temperature of secondary air at inlet of air pre-heater
CN103868054A (en) * 2014-04-04 2014-06-18 四川电力建设三公司 Boiler starting speed increasing and oil-saving arrangement structure for heat power station and method for rapidly starting boiler

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Application publication date: 20111221