CN109945227A - Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion - Google Patents
Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion Download PDFInfo
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- CN109945227A CN109945227A CN201910379474.4A CN201910379474A CN109945227A CN 109945227 A CN109945227 A CN 109945227A CN 201910379474 A CN201910379474 A CN 201910379474A CN 109945227 A CN109945227 A CN 109945227A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 27
- 238000005260 corrosion Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000003303 reheating Methods 0.000 claims description 22
- 239000003245 coal Substances 0.000 claims description 18
- 230000002401 inhibitory effect Effects 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 8
- 239000003517 fume Substances 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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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
Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion, it is related to station boiler auxiliary system complex optimum field, including the branch supply air system being connected to main flue gas cooling system, the branch supply air system includes branch pressure fan, the blowing mouth of branch pressure fan passes through another inlet communication of the cold secondary air duct of branch and heat exchanger, and another outlet of heat exchanger is connected to by the hot secondary air duct of branch with main flue gas cooling system；The branch pressure fan is connected to by branch air blower inlet air duct with branch air blower inlet bellows.Including the cold double reheat air duct being connected between the hot secondary air duct of branch and secondary air system.Including being connected to branch between cold double reheat air duct and the branch air blower inlet air duct of the branch pressure fan of branch supply air system hot-flow flue again.Including connection in the branch hot-flow flue again of the First air between hot-flow flue and primary air system again.The present invention solves exhaust gas temperature height, air preheater low-temperature corrosion, the low problem of boiler efficiency.
Description
Technical field
The present invention relates to station boiler auxiliary system complex optimum field, especially a kind of reduction exhaust gas temperature inhibits
The system and process of air preheater low-temperature corrosion.
Background technique
The operating condition of coal-fired power station boiler is complicated, and the quality of power plant soot is complicated and changeable, and exhaust gas temperature is high at present
The problem of it is generally existing.Requirement recently as energy-saving and emission-reduction is increasingly stringent, and exhaust gas temperature how is effectively reduced, and improves coal-fired
The thermal efficiency of power plant is particularly important.
The reason for causing exhaust gas temperature high has very much, caused by having operation control and auxiliary machinery fault, also there is coal quality change
Caused by the uncontrollable factors such as change.It, should be from elimination of equipment defect and optimization operation side caused by if it is operation control and auxiliary machinery fault
Face solves.If it is coal property variation etc. caused by uncontrollable factors, the total amount of heat of fuel has exceeded boiler and air preheater
Absorbability results in the raising of exhaust gas temperature, and low temperature can be arranged on Boiler Furnace rear pass in this case and save coal
Device, by heating host condensate-water polishing fume afterheat, the system is more mature, and the application in coal-burning power plant is also more universal.
Low-level (stack-gas) economizer heat-setting water is to achieve the purpose that save coal consumption for power generation, but due to low-pressure pumping steam by squeezing low-pressure pumping steam
Most heats come from the latent heat of vaporization of steam, only small part is for the acting that generates electricity, therefore the reality of the system
Benefit of saving coal is not high.Optimal mode is directly to be recovered to the waste heat of smoke evacuation in boiler, improves boiler efficiency, section
Coal benefit is 3 times or so of low-level (stack-gas) economizer heat-setting water system.
Meanwhile existing series connection flue gas heat-exchange unit will appear low-temperature corrosion although exhaust gas temperature can be reduced, and influence
Air preheater operates normally；Wind side and flue gas collateral resistance increase, and cause blower power output inadequate；Existing parallel connection flue gas heat-exchange unit, leads to
The heat exchange amount that bypass flue gas increases Secondary Air is crossed, will affect the heating amount of First air, may cause boiler milling system power output
It is insufficient；The existing method for improving cold junction temperature using thermal wind sensor has the dust carried in flue gas in hot wind, long-term to transport
Guild causes fan blade serious wear；In addition, thermal wind sensor can reduce the through-current capability of Secondary Air in air preheater, pot is reduced
The efficiency of furnace.
In order to reduce exhaust gas temperature, and reach optimal energy-saving effect, the invention proposes a kind of reduction boiler rows
Smoke temperature degree, the system for improving boiler efficiency, inhibiting air preheater low-temperature corrosion.
Summary of the invention
The object of the present invention is to provide reduce exhaust gas temperature inhibit air preheater low-temperature corrosion system and process,
Solve exhaust gas temperature height, air preheater low-temperature corrosion, the low problem of boiler efficiency.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of system for reducing exhaust gas temperature and inhibiting air preheater low-temperature corrosion.
Including boiler flue gas cool-down system, the boiler flue gas cool-down system includes main flue gas cooling system, First air system
System and secondary air system.
Including the branch flue gas cool-down system being connected to main flue gas cooling system, the branch flue gas cool-down system includes changing
Hot device, connection branch flue before the heat exchange of one import of heat exchanger, and connection branch flue after the heat exchange that heat exchanger one exports.
Including the branch supply air system being connected to main flue gas cooling system, the branch supply air system includes branch air-supply
Machine, the blowing mouth of branch pressure fan pass through another inlet communication of the cold secondary air duct of branch and heat exchanger, heat exchanger it is another go out
Mouth is connected to by the hot secondary air duct of branch with main flue gas cooling system；The branch pressure fan passes through branch air blower inlet air duct
It is connected to branch air blower inlet bellows.
Including the cold double reheat air duct being connected between the hot secondary air duct of branch and secondary air system.
Including being connected to the branch air blower inlet wind in cold double reheat air duct and the branch pressure fan of branch supply air system
Branch between road hot-flow flue again；Hot-flow flue is equipped with branch reheating air duct controllable register to the branch again.
Including connection in the branch hot-flow flue again of the First air between hot-flow flue and primary air system again.
Branch flue is equipped with the preceding branch flue damper that exchanges heat before the heat exchange.
The main flue gas cooling system includes boiler and air preheater.
It is connected between the boiler and an entrance of air preheater by air preheater gas approach, an outlet of the air preheater
It is connected to air preheater exhaust pass and drains into drop hot fume in air.
The air preheater gas approach 4 of branch flue and main flue gas cooling system before the heat exchange of the branch flue gas cool-down system
Connection, branch flue is connected to the air preheater exhaust pass of main flue gas cooling system after heat exchange.
The secondary air system includes hot secondary air box and the secondary air fan being connected on boiler.
It is connected between the secondary air fan and another entrance of air preheater by cold secondary air duct, another outlet of air preheater
It is connected between hot secondary air box by hot secondary air duct.
The secondary air fan is connected to by secondary air fan inlet conduits with secondary air fan entrance bellows.
The outlet in the cold double reheat air duct is connected to secondary air fan inlet conduits.
The cold double reheat air duct is equipped with cold double reheat air duct controllable register.
The primary air system includes coal pulverizer and primary air fan.
Be connected between the primary air fan and another entrance of air preheater by a cold air duct, the air preheater it is another
Outlet is connected to between coal pulverizer by heat primary air road.
The primary air fan is connected to by primary air fan inlet conduits with primary air fan entrance bellows.
The outlet of hot-flow flue is connected to the First air with primary air fan inlet conduits again.
Hot-flow flue is equipped with First air reheating air duct controllable register to the First air again.
The heat exchanger is gas-gas surface-type heat exchanger.
Inhibit the process of the system of low-temperature corrosion of air preheater using the reduction exhaust gas temperature,
The process of fume side are as follows:
The part of smoke of the boiler flue gas outlet is discharged after air preheater, and the exhaust gas volumn of another part flue gas is exchanged heat preceding branch
Flue damper regulation in road is discharged together with part of smoke after heat exchanger heat exchange cooling, and flue-gas temperature reduces by 8 when discharge
~15 DEG C.
The process of air side are as follows:
By the cold First air of primary air fan output after air preheater becomes heat primary air, it is sent into coal pulverizer.
Hot secondary air box by the cold Secondary Air of secondary air fan output after air preheater becomes hot Secondary Air, on feeding boiler
It is interior.
The cold Secondary Air that branch pressure fan exports is become into hot Secondary Air after heat exchanger heat exchange heating, it is then that heat is secondary
A part of wind is sent into the hot secondary air box on boiler, another part of hot Secondary Air is further divided into three parts, wherein first
Part is cold double reheat wind, and heating air quantity is sent into secondary air fan entrance after the regulation of cold double reheat air duct controllable register
In air duct, the cold Secondary Air of heating secondary air fan output, wherein second part is First air hot wind again, and heating air quantity is through primary
It after the regulation of wind reheating air duct controllable register, is sent into primary air fan inlet conduits, the cold First air of heating primary air fan output,
Middle Part III is branch hot wind again, and heating air quantity is sent into branch pressure fan after the regulation of branch reheating air duct controllable register
In inlet conduits, the cold Secondary Air of branch of heating branch pressure fan output.
Compared with prior art the invention has the characteristics that and the utility model has the advantages that
1, cold Secondary Air hot-flow flue and First air hot-flow flue again again is set；Cold double reheat air duct is drawn from the hot secondary air duct of branch to add
Hot secondary air system cold end draws First air reheating air duct from the hot secondary air duct of branch and heats primary air system cold end, utilizes portion
The hot Secondary Air of branch path heats cold wind, improves air preheater cold junction temperature during the cold season, effectively inhibits the low-temperature corrosion of air preheater,
The heating method of the air preheater cold junction temperature is simpler, and heat exchange efficiency is high；If hot-flow flue also can solve system to First air again
The problem of dried bean noodles dry undercapacity, especially mixes the boiler for burning high water content brown coal；Simultaneously because gas-gas surface-type heat exchanger is close
Close structure, be free of flue dust, dust in the hot Secondary Air of branch there is no leaking out, therefore after exchanging heat, will not influence secondary air fan and
The safe operation of primary air fan, and the through-current capability of Secondary Air in air preheater will not be reduced.
2, branch hot-flow flue again is set；It is cold that branch reheating air duct heating branch supply air system is drawn from the hot secondary air duct of branch
End heats cold wind using the hot Secondary Air of partial branch, inhibits the low-temperature corrosion of heat exchanger cold end, improve the heating of branch Secondary Air
Amount, guarantees the normal operation of boiler milling system.
3, branch flue is set, and sets heat exchanger on branch flue；The present invention on air preheater gas approach by drawing
Branch flue, and heat exchanger is set on branch flue, it is exchanged heat and is cooled down by heat exchanger, reduce the exhaust gas temperature of boiler, it can
So that exhaust gas temperature control improves boiler efficiency, effectively reduces coal consumption for power generation in lower level；And it is set on branch flue
Controllable register, controlling brancher flue air output.
4, branch secondary air duct is set, is exchanged heat with branch flue by heat exchanger；If independent branch pressure fan, branch are secondary
The air quantity in air duct is controlled by branch pressure fan, and the terminal of branch secondary air duct is directly accessed the hot secondary air box of boiler, to original
The supply air system of boiler flue gas cool-down system do not constitute influence, mutually indepedent with former supply air system, control flexibly, and is sent with original
Wind system is parallel running, will not influence the power output of original pressure fan；Branch secondary air duct is by passing through heat exchange with branch flue
The waste heat of flue gas is heated branch Secondary Air, improves boiler efficiency by device heat exchange.
5, to sum up, the present invention can reduce exhaust gas temperature, effectively reduce effectively aiming at the problem that exhaust gas temperature increases
Heat loss due to exhaust gas, improves boiler efficiency；At the same time, the waste heat of flue gas is supplied to branch Secondary Air, reduced
Unburned carbon loss, boiler efficiency are further increased, and exhaust gas temperature 8~15 can be effectively reduced in invention
DEG C, improve boiler efficiency about 0.4%~0.8%.
6, the total system that above-mentioned flue and air duct are constituted, operation is independent, can coal property according to boiler and operation
Characteristic is adjusted flexibly and closes.
It the composite can be widely applied in boiler accessory machinery system.
Detailed description of the invention
The present invention will be further described in detail with reference to the accompanying drawing.
Fig. 1 is system diagram of the invention.
Appended drawing reference: 1-boiler, 2-air preheaters, 3-heat exchangers, 4-air preheater gas approach, the outlet of 5-air preheaters
Branch flue, 8-hot secondary air box, 9-secondary air fans, 10-Secondary Airs after branch flue, 7-exchange heat before flue, 6-exchange heat
Machine entrance bellows, 11-cold secondary air ducts, 12-hot secondary air ducts, 13-primary air fans, 14-primary air fan entrance bellows,
15-coal pulverizers, the 16-air ducts Leng Yici, 17-heat primary air roads, 18-branch pressure fan, 19-branch air blower inlet wind
Case, the cold secondary air duct of 20-branches, the hot secondary air duct of 21-branches, 22-cold double reheat air ducts, 23-cold double reheat wind
Road controllable register, 24-branches hot-flow flue, 25-branch reheating air duct controllable registers, 26-First airs hot-flow flue, 27-again again
Branch flue damper, 29-branch air blower inlet air ducts, 30-before First air reheating air duct controllable register, 28-exchange heat
Secondary air fan inlet conduits, 31-primary air fan inlet conduits.
Specific embodiment
Embodiment is shown in Figure 1, reduces system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion,
Reducing exhaust gas temperature to inhibit the system of air preheater low-temperature corrosion includes boiler flue gas cool-down system, the boiler flue gas cool-down
System includes main flue gas cooling system, primary air system and secondary air system；Including the branch being connected to main flue gas cooling system
Flue gas cool-down system, the branch flue gas cool-down system include heat exchanger 3, connection branch before the heat exchange of 3 one import of heat exchanger
Flue 6, and connection branch flue 7 after the heat exchange that heat exchanger 3 one exports；Branch including being connected to main flue gas cooling system is sent
Wind system, the branch supply air system include branch pressure fan 18, and the blowing mouth of branch pressure fan 18 passes through the cold Secondary Air of branch
Another outlet of another inlet communication in road 20 and heat exchanger 3, heat exchanger 3 is cooled down by the hot secondary air duct 21 of branch with main flue gas
System connectivity；The branch pressure fan 18 is connected to by branch air blower inlet air duct 29 with branch air blower inlet bellows 19；
Including the cold double reheat air duct 22 being connected between the hot secondary air duct 21 of branch and secondary air system；
Including being connected to the branch air blower inlet wind in cold double reheat air duct 22 and the branch pressure fan 18 of branch supply air system
Branch reheating air duct 24 between road 29；Branch reheating air duct 24 is equipped with branch reheating air duct controllable register 25, is used for
Regulation heating air quantity；Including the First air reheating air duct 26 being connected between branch reheating air duct 24 and primary air system；It is described
Branch flue 6 is equipped with the preceding branch flue damper 28 that exchanges heat and can drop in environment temperature for regulating and controlling heating air quantity before exchanging heat
It is opened when low, guarantees that air preheater and heat exchanger cold end region are rationally designing in range, inhibit low-temperature corrosion；The main flue gas drop
Warm system includes boiler 1 and air preheater 2；Connected between the boiler 1 and an entrance of air preheater 2 by air preheater gas approach 4
Logical, an outlet of the air preheater 2 is connected to air preheater exhaust pass 5 and drains into drop hot fume in air；The branch cigarette
Branch flue 6 is connected to the air preheater gas approach 4 of main flue gas cooling system before the heat exchange of gas cooling system, branch cigarette after heat exchange
Road 7 is connected to the air preheater exhaust pass 5 of main flue gas cooling system；The secondary air system includes the heat being connected on boiler 1
Secondary air box 8 and secondary air fan 9；Connected between the secondary air fan 9 and another entrance of air preheater 2 by cold secondary air duct 11
It is logical, it is connected between another outlet of air preheater 2 and hot secondary air box 8 by hot secondary air duct 12；The secondary air fan 9 passes through two
Secondary fans entrance air duct 30 is connected to secondary air fan entrance bellows 10；The outlet in the cold double reheat air duct 22 and secondary air fan
Inlet conduits 30 are connected to；The cold double reheat air duct 22 is equipped with cold double reheat air duct controllable register 23；The First air
System includes coal pulverizer 15 and primary air fan 13；By cold primary between the primary air fan 13 and another entrance of air preheater 2
Air duct 16 is connected to, and is connected between another outlet and coal pulverizer 15 of the air preheater 2 by heat primary air road 17；The First air
Machine 13 is connected to by primary air fan inlet conduits 31 with primary air fan entrance bellows 14；The outlet in First air reheating air duct 26
It is connected to primary air fan inlet conduits 31；First air reheating air duct 26 is equipped with First air reheating air duct controllable register 27,
For regulating and controlling to heat air quantity；The heat exchanger 3 is gas-gas surface-type heat exchanger.
Using the process for reducing exhaust gas temperature and inhibiting the system of low-temperature corrosion of air preheater:
The process of fume side are as follows: the part of smoke of the 1 exhanst gas outlet flue gas of boiler is discharged after air preheater 2, another part
Before the exhaust gas volumn of flue gas is exchanged heat branch flue damper 28 regulate and control, through heat exchanger 3 heat exchange cooling after with part of smoke one
Play discharge.
The process of air side are as follows: the cold First air for exporting primary air fan 13 is sent into after air preheater 2 becomes heat primary air
In coal pulverizer 15；Heat two of the cold Secondary Air that secondary air fan 9 is exported after air preheater 2 becomes hot Secondary Air, on feeding boiler 1
In secondary bellows 8；The cold Secondary Air that branch pressure fan 18 exports is become into hot Secondary Air after the heat exchange heating of heat exchanger 3, then will
A part of hot Secondary Air is sent into the hot secondary air box 8 on boiler 1, and another part of hot Secondary Air is further divided into three parts,
Wherein first part is cold double reheat wind, and heating air quantity is sent into two after the regulation of cold double reheat air duct controllable register 23
In secondary fans entrance air duct 30, the cold Secondary Air that heating secondary air fan 9 exports, wherein second part is First air hot wind again,
Air quantity is heated after the regulation of First air reheating air duct controllable register 27, is sent into primary air fan inlet conduits 31, heats First air
The cold First air that machine 13 exports, wherein Part III is branch hot wind again, heats air quantity through branch reheating air duct controllable register
It after 25 regulations, is sent into branch air blower inlet air duct 29, the cold Secondary Air of branch that heating branch pressure fan 18 exports.
Claims (10)
1. a kind of system for reducing exhaust gas temperature and inhibiting air preheater low-temperature corrosion,
Including boiler flue gas cool-down system, the boiler flue gas cool-down system includes main flue gas cooling system, primary air system and
Secondary air system；
It is characterized by:
Including the branch flue gas cool-down system being connected to main flue gas cooling system, the branch flue gas cool-down system includes heat exchanger
(3), connection branch flue (6) before the heat exchange of (3) one import of heat exchanger, and connection is after the heat exchange that heat exchanger (3) one exports
Branch flue (7)；
Including the branch supply air system being connected to main flue gas cooling system, the branch supply air system includes branch pressure fan
(18), the blowing mouth of branch pressure fan (18) passes through another inlet communication of the cold secondary air duct of branch (20) and heat exchanger (3), changes
Another outlet of hot device (3) is connected to by the hot secondary air duct of branch (21) with main flue gas cooling system；The branch pressure fan
(18) it is connected to by branch air blower inlet air duct (29) with branch air blower inlet bellows (19)；
Including the cold double reheat air duct (22) being connected between the hot secondary air duct of branch (21) and secondary air system；
Branch pressure fan including connection in cold double reheat air duct (22) and the branch pressure fan (18) of branch supply air system enters
Branch between one's intention as revealed in what one says road (29) hot-flow flue (24) again；Hot-flow flue (24) is equipped with branch reheating air duct adjusting gear to the branch again
Plate (25)；
Including connection in branch hot-flow flue (26) again of the First air between hot-flow flue (24) and primary air system again.
2. the system according to claim 1 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: branch flue (6) is equipped with the preceding branch flue damper (28) that exchanges heat before the heat exchange.
3. the system according to claim 1 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: the main flue gas cooling system includes boiler (1) and air preheater (2)；
It is connected between the boiler (1) and an entrance of air preheater (2) by air preheater gas approach (4), the air preheater (2)
One outlet be connected to air preheater exhaust pass (5) and by drop hot fume drain into air.
4. the system according to claim 3 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
It is: the air preheater gas approach of branch flue (6) and main flue gas cooling system before the heat exchange of the branch flue gas cool-down system
(4) it is connected to, branch flue (7) is connected to the air preheater exhaust pass (5) of main flue gas cooling system after heat exchange.
5. the system according to claim 1 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: the secondary air system includes the hot secondary air box (8) being connected on boiler (1) and secondary air fan (9)；
It is connected between the secondary air fan (9) and another entrance of air preheater (2) by cold secondary air duct (11), air preheater (2)
Another outlet and hot secondary air box (8) between be connected to by hot secondary air duct (12)；
The secondary air fan (9) is connected to by secondary air fan inlet conduits (30) with secondary air fan entrance bellows (10).
6. the system according to claim 5 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: the outlet of the cold double reheat air duct (22) is connected to secondary air fan inlet conduits (30)；
The cold double reheat air duct (22) is equipped with cold double reheat air duct controllable register (23).
7. the system according to claim 1 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: the primary air system includes coal pulverizer (15) and primary air fan (13)；
It is connected between the primary air fan (13) and another entrance of air preheater (2) by a cold air duct (16), it is described empty pre-
It is connected between another outlet of device (2) and coal pulverizer (15) by heat primary air road (17)；
The primary air fan (13) is connected to by primary air fan inlet conduits (31) with primary air fan entrance bellows (14).
8. the system according to claim 7 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: the outlet of hot-flow flue (26) is connected to the First air with primary air fan inlet conduits (31) again；
Hot-flow flue (26) is equipped with First air reheating air duct controllable register (27) to the First air again.
9. the system according to claim 1 for reducing exhaust gas temperature and inhibiting low-temperature corrosion of air preheater, feature
Be: the heat exchanger (3) is gas-gas surface-type heat exchanger.
10. the technique that application reduction exhaust gas temperature described in claim 1 inhibits the system of low-temperature corrosion of air preheater
Method, it is characterised in that:
The process of fume side are as follows:
The part of smoke of boiler (1) exhanst gas outlet is discharged after air preheater (2), and the exhaust gas volumn of another part flue gas is through changing
Branch flue damper (28) regulates and controls before heat, is discharged together with part of smoke after heat exchanger (3) heat exchange cooling, when discharge
Flue-gas temperature reduces by 8~15 DEG C；
The process of air side are as follows:
By the cold First air of primary air fan (13) output after air preheater (2) becomes heat primary air, it is sent into coal pulverizer (15)；
By heat two of the cold Secondary Air of secondary air fan (9) output after air preheater (2) becomes hot Secondary Air, in feeding boiler (1)
In secondary bellows (8)；
The cold Secondary Air of branch pressure fan (18) output is become into hot Secondary Air after heat exchanger (3) heat exchange heating, it then will be hot
A part of Secondary Air is sent into the hot secondary air box (8) on boiler (1), and another part of hot Secondary Air is further divided into three
Point, wherein first part is cold double reheat wind, and heating air quantity is sent after cold double reheat air duct controllable register (23) regulation
Enter in secondary air fan inlet conduits (30), the cold Secondary Air of heating secondary air fan (9) output, wherein second part be First air again
Hot wind, heating air quantity are sent into primary air fan inlet conduits (31) after First air reheating air duct controllable register (27) regulation,
The cold First air of primary air fan (13) output is heated, wherein Part III is branch hot wind again, heats air quantity through branch reheating
After air duct controllable register (25) regulation, it is sent into branch air blower inlet air duct (29), heating branch pressure fan (18) output
The cold Secondary Air of branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910379474.4A CN109945227A (en) | 2019-05-08 | 2019-05-08 | Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910379474.4A CN109945227A (en) | 2019-05-08 | 2019-05-08 | Reduce system and process that exhaust gas temperature inhibits air preheater low-temperature corrosion |
Publications (1)
| Publication Number | Publication Date |
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| CN109945227A true CN109945227A (en) | 2019-06-28 |
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| CN110397947A (en) * | 2019-07-05 | 2019-11-01 | 湖南大唐节能科技有限公司 | A kind of air preheater is anti-blocking and enhances heat transfer unit (HTU) |
| CN110594776A (en) * | 2019-08-28 | 2019-12-20 | 华电电力科学研究院有限公司 | Air preheater hot air recycling system and working method thereof |
| CN110848729A (en) * | 2019-10-18 | 2020-02-28 | 华电电力科学研究院有限公司 | Rotary air preheater blockage prevention and control system and working method thereof |
| CN110986077A (en) * | 2019-12-26 | 2020-04-10 | 润电能源科学技术有限公司 | Coal-fired unit heat utilizes system |
| CN114413275A (en) * | 2021-12-24 | 2022-04-29 | 华能巢湖发电有限责任公司 | Method for treating blockage of air preheater and reducing flue pressure |
| CN114440253A (en) * | 2022-02-10 | 2022-05-06 | 西安热工研究院有限公司 | System for solving stalling, surging and low-temperature corrosion of unit deep peak regulation primary fan |
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