CN207702507U - A kind of combination unit for delaying coal-burning boiler air preheater to block - Google Patents
A kind of combination unit for delaying coal-burning boiler air preheater to block Download PDFInfo
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- CN207702507U CN207702507U CN201721642090.XU CN201721642090U CN207702507U CN 207702507 U CN207702507 U CN 207702507U CN 201721642090 U CN201721642090 U CN 201721642090U CN 207702507 U CN207702507 U CN 207702507U
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- China
- Prior art keywords
- heat
- air
- air preheater
- heat exchanger
- coil pipe
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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
The utility model discloses a kind of combination units for delaying coal-burning boiler air preheater to block, including：Heat exchanger is sequentially communicated air preheater, the first deduster, heat exchange pipeline, the second deduster and air-introduced machine on boiler flue, and be set to outside boiler flue air supply duct, pressure fan；The heat absorbing end of the heat exchanger is connected with the heat exchange pipeline, and the release end of heat of the heat exchanger is connected with the air supply duct, and the heat exchanger is used to carry out heat exchange with the air in the boiler smoke and the air-supply passage in the boiler flue.The combination unit that the utility model delays coal-burning boiler air preheater to block can effectively slow down the fouling and clogging of air preheater itself, extend the cycle of operation of air preheater, the cost of overhaul is reduced, can also solve the problems, such as that efficiency of dust collection declines caused by the exhaust gas temperature raising that air preheater exports.
Description
Technical field
The utility model is related to coal-burning boiler technical fields, and in particular to a kind of group for delaying coal-burning boiler air preheater to block
It attaches together and sets.
Background technology
Coal-burning power plant of China generally completes minimum discharge transformation at present, and the nitrous oxides concentration of denitrating system outlet is average
Value is no more than 50mg/Nm3, the guarantee value of the escaping of ammonia is still maintained at 3ppm.With the promotion of SCR operational efficiency, due to entrance cigarette
The variation of gas parameter and the extension of catalyst run, to highlight, discharged nitrous oxides concentration is low and ammonia slip concentration is big
Contradiction.In actual moving process, it is the black dirt for cohering medium that air preheater surface, which is easily generated with ammonium hydrogen sulfate, and air preheater is caused to hinder
Power increases, and directly affects station service power consumption rate；The heat exchange efficiency that air preheater can be also reduced when black dirt is serious, influences boiler efficiency.
In order to delay the deterioration of this phenomenon, power plant generally takes following measure at present：(1) use steam air heater pair one,
Secondary Air is preheated, but its heating is limited, usually at 50 DEG C hereinafter, actually there is also the differences of Summer and winter operating condition.(2)
Certain calorimetric primary and secondary air is recycled to improve first and second air temperature of air preheater entrance, this measure will influence air preheater
Heat exchange efficiency, exhaust gas temperature increase, reduce boiler efficiency.(3) quote unit exhaust steam, directly to primary and secondary air into
Row heating, this measure improves the relative humidity of primary and secondary air, theoretically improves the acid dew point in flue gas, to air preheater and
Follow-up equipment increases corrosion risk.(4) it in the case where unit does not shut down plan, is asked to alleviate air preheater blocking
Topic directly enhances air preheater exit gas temperature, however this measure does not solve critical issue, moreover air preheater exports cigarette
Temperature can not be increased to 150~170 DEG C without limitation, and in the warming-up section of air preheater primary and secondary air, it is not good enough still to there is the highest temperature,
The black dirt of ammonium hydrogen sulfate is caused to be attached to air preheater surface, only the section of fouling generates certain displacement.
Utility model content
For problems of the prior art, the purpose of this utility model is to provide one kind to delay coal-burning boiler empty pre-
The combination unit that device blocks, can effectively slow down the fouling and clogging of air preheater itself, extend the cycle of operation of air preheater, reduce maintenance
Cost can also solve the problems, such as that efficiency of dust collection declines caused by the exhaust gas temperature raising that air preheater exports.
In order to achieve the above object, the utility model is achieved using following technical scheme.
A kind of combination unit for delaying coal-burning boiler air preheater to block, including：Heat exchanger is sequentially communicated on boiler flue
Air preheater, the first deduster, heat exchange pipeline, the second deduster and air-introduced machine, and the ajutage that is set to outside boiler flue
Road, pressure fan；The heat absorbing end of the heat exchanger is connected with the heat exchange pipeline, the release end of heat of the heat exchanger and the air-supply
Pipeline is connected, and the heat exchanger is used to carry out with the air in the boiler smoke and the air-supply passage in the boiler flue
Heat exchange.
The combination unit according to the present utility model for delaying coal-burning boiler air preheater to block, by the first deduster exhanst gas outlet
In the boiler smoke and air supply duct of discharge by pressure fan be sent into air in heat exchange pipeline with the heat transferring medium in heat exchanger
Heat exchange is carried out, the temperature of the First air of air preheater entrance or Secondary Air can be increased to 70-80 DEG C, by the flue gas of air preheater
At 150-170 DEG C, increasing for air preheater exhaust gas temperature can effectively will be with cohering characteristic for the flue-gas temperature control of side output end
Flying dust in ammonium hydrogen sulfate and flue gas is in free state, avoid flue-gas temperature it is relatively low when, ammonium hydrogen sulfate and flying dust are simultaneously deposited
The case where.The minimum temperature difference on air preheater heat-transfer surface is reduced, can effectively avoid with ammonium hydrogen sulfate is the black dirt for cohering medium, will
It after the cross section displacement to air preheater of fouling, is handled by the first deduster, and as flying dust discharging system is discharged.This
Outside, due to the raising of air preheater exhaust gas temperature, efficiency of dust collection can be caused to decline, the utility model is also connected with after heat exchange pipeline
There are the second deduster, the first deduster that can first remove the flying dust of 80-90% in high temperature section, then significantly be dropped by heat exchanger again
After low flue-gas temperature, the second deduster is realized to the efficient removal of dust in flue gas, and efficiency of dust collection is which thereby enhanced.Even if passing through
It crosses the low-temperature zone that heat exchanger exchanges after heat and ammonium hydrogen sulfate occurs, but since its total amount is few, and the first deduster has removed
Remove most of flying dust, the accounting of ammonium hydrogen sulfate improves in the ammonium hydrogen sulfate black dirt in this stage, therefore is only needed just during maintenance
Normal high pressure water washing can quickly remove surface black dirt, thus greatly reduce the cost of overhaul.
Preferably, the heat exchanger includes heat absorption coil pipe, heat release coil pipe and the circulating pump connected by pipeline, the heat exchange
The heat absorption coil pipe of device is set to the inside of the heat exchange pipeline, and the heat release coil pipe of the heat exchanger is set to the air supply duct
It is internal.
The combination unit according to the present utility model for delaying coal-burning boiler air preheater to block, heat absorption coil pipe are set to heat exchanger tube
The inside in road, heat release coil pipe are set to the inside of air supply duct, and heat absorption coil pipe is connected to by pipeline in heat exchanger tube with heat release coil pipe
Between road and air supply duct, circulating pump make heat transferring medium heat absorption coil pipe and heat release coil pipe between circulation, realize its with
The air exchange heat that boiler smoke and hair-dryer are sent into is sent into the temperature of air to improve pressure fan to air preheater, in turn
Air preheater exhaust gas temperature is promoted, the minimum temperature difference on air preheater heat-transfer surface is reduced, effectively slows down the fouling and clogging of air preheater itself.
In addition, although the setting of heat exchanger improves the resistance of air and gas system, air preheater caused by due to air preheater fouling and clogging
The raising of ontology resistance will be compensated for, even better than the operation of air preheater；Therefore, the utility model delays the air preheater to block
Device longtime running greatly reduce the maintenance and repair costs of air preheater.
Preferably, the heat exchanger includes heat absorption coil pipe, heat release coil pipe and the circulating pump connected by pipeline, the heat exchange
The absorbing heat disk pipe dish of device is wound on the outer wall of the heat exchange pipeline, and the heat release coil pipe of the heat exchanger is coiled in the air supply duct
Outer wall.
The combination unit according to the present utility model for delaying coal-burning boiler air preheater to block, absorbing heat disk pipe dish are wound on heat exchanger tube
The outer wall in road, heat release coil pipe are coiled in the outer wall of air supply duct, and heat absorption coil pipe is exchanging heat with being connected to by pipeline with heat release coil pipe
Between pipeline and air supply duct, circulating pump makes heat transferring medium circulation between heat absorption coil pipe and heat release coil pipe, realizes it
The air exchange heat being sent into boiler smoke and hair-dryer improves the temperature that pressure fan is sent into air to air preheater, Jin Erti
Air preheater exhaust gas temperature is risen, the minimum temperature difference on air preheater heat-transfer surface is reduced, effectively slows down the fouling and clogging of air preheater itself.And
And absorbing heat disk pipe dish is wound on the outer wall of heat exchange pipeline, not will increase the resistance of air and gas system.
Preferably, first deduster is electrostatic precipitator.
Preferably, second deduster is bag filter.
The combination unit according to the present utility model for delaying coal-burning boiler air preheater to block, the first deduster are electrostatic precipitation
Device, electrostatic precipitator is using the dust in high voltage direct current trapping boiler smoke, to remove the major part of boiler smoke China
Flying dust；Since most of flying dust in flue gas is removed by the first deduster, the second deduster can be bag filter,
Cost is reduced while improving efficiency of dust collection.
Description of the drawings
The utility model is described in further details in the following with reference to the drawings and specific embodiments.
Fig. 1 is that a kind of structure of embodiment of the combination unit for delaying the blocking of coal-burning boiler air preheater of the utility model is shown
It is intended to.
In figure：1 heat exchanger；2 air preheaters；3 first dedusters；4 heat exchange pipelines；5 second dedusters；6 air-introduced machines；7 boilers
8 air supply duct of flue；9 pressure fan；10 heat absorption coil pipes；11 heat release coil pipes；12 circulating pumps；13 boilers；14 Benitration reactors；15 is de-
Sulphur tower；16 chimneys.
Specific implementation mode
The embodiments of the present invention are described in detail below in conjunction with embodiment, but those skilled in the art
Member will be understood that the following example is merely to illustrate the utility model, and be not construed as limitation the scope of the utility model.
With reference to figure 1, what the embodiment of content according to the present utility model was proposed delays coal-burning boiler air preheater to block
Combination unit, including：Heat exchanger 1 is sequentially communicated air preheater 2 on boiler flue 7, the first deduster 3, heat exchange pipeline 4,
Two dedusters 5 and air-introduced machine 6, and be set to outside boiler flue 7 air supply duct 8, pressure fan 9；The heat absorption of the heat exchanger 1
End is connected with the heat exchange pipeline 4, and the release end of heat of the heat exchanger 1 is connected with the air supply duct 8, the heat exchanger 1
For carrying out heat exchange with the air in the boiler smoke and the air-supply passage in the boiler flue 7.
In the embodiment above, by blowing in the boiler smoke and air supply duct 8 that are discharged by 3 exhanst gas outlet of the first deduster
The air that machine 9 is sent into carries out heat exchange in heat exchange pipeline 4 with the heat transferring medium in heat exchanger 1, can be by 2 entrance of air preheater
The temperature of First air or Secondary Air is increased to 70-80 DEG C, and the flue-gas temperature of the fume side output end of air preheater 2 is controlled in 150-
170 DEG C, the raising of 2 exhaust gas temperature of air preheater will effectively can be in the flying dust in the ammonium hydrogen sulfate and flue gas that cohere characteristic
Free state, avoid flue-gas temperature it is relatively low when, ammonium hydrogen sulfate and flying dust and the case where deposit.It reduces on 2 heat-transfer surface of air preheater
The minimum temperature difference, can effectively avoid with ammonium hydrogen sulfate is the black dirt for cohering medium, by the cross section displacement of fouling to air preheater 2 it
Afterwards, it is handled by the first deduster 3, and as flying dust discharging system is discharged.Further, since 2 exhaust gas temperature of air preheater
It increases, efficiency of dust collection can be caused to decline, the utility model is also associated with the second deduster 5, the first dedusting after heat exchange pipeline 4
Device 3 can first remove the flying dust of 80-90% in high temperature section, and after flue-gas temperature then is greatly lowered by heat exchanger 1 again, second removes
Dirt device 5 is realized to the efficient removal of dust in flue gas, and efficiency of dust collection is which thereby enhanced.Even if exchanging heat by heat exchanger 1
There is ammonium hydrogen sulfate in low-temperature zone later, but since its total amount is few, and the first deduster 3 has removed most of flying dust, this
The accounting of ammonium hydrogen sulfate improves in the ammonium hydrogen sulfate black dirt in stage, therefore only needs normal high pressure water washing i.e. during maintenance
Surface black dirt can be quickly removed, the cost of overhaul is thus greatly reduced.
One embodiment according to the present utility model, the heat exchanger 1 include the heat absorption coil pipe 10 connected by pipeline, put
Hot coil 11 and circulating pump 12, the heat absorption coil pipe 10 of the heat exchanger 1 are set to the inside of the heat exchange pipeline 4, the heat exchange
The heat release coil pipe 11 of device 1 is set to the inside of the air supply duct 8.
In the embodiment above, heat absorption coil pipe 10 is set to the inside of heat exchange pipeline 4, and heat release coil pipe 11 is set to ajutage
The inside in road 8, heat absorption coil pipe 10 and heat release coil pipe 11 are connected to by pipeline between heat exchange pipeline 4 and air supply duct 8, circulating pump
12 so that heat transferring medium circulation between heat absorption coil pipe 10 and heat release coil pipe 11, realizes that it send with boiler smoke and hair-dryer
The air exchange heat entered is sent into the temperature of air to improve pressure fan 9 to air preheater 2, and then promotes air preheater 2 and discharge fume temperature
Degree, reduces the minimum temperature difference on 2 heat-transfer surface of air preheater, effectively slows down air preheater 2 fouling and clogging of itself.Although in addition, heat exchange
The setting of device 1 improves the resistance of air and gas system, but 2 ontology resistance of air preheater caused by due to 2 fouling and clogging of air preheater
Raising will be compensated for, even better than the operation of air preheater 2；Therefore, the device for delaying air preheater 2 to block of the utility model is long
Phase runs the maintenance and repair costs for greatly reducing air preheater 2.
One embodiment according to the present utility model, the heat exchanger 1 include the heat absorption coil pipe 10 connected by pipeline, put
Hot coil 11 and circulating pump 12, the heat absorption coil pipe 10 of the heat exchanger 1 are coiled in the outer wall of the heat exchange pipeline 4, the heat exchange
The heat release coil pipe 11 of device 1 is coiled in the outer wall of the air supply duct 8.
In the embodiment above, heat absorption coil pipe 10 is coiled in the outer wall of heat exchange pipeline 4, and heat release coil pipe 11 is coiled in ajutage
The outer wall in road 8, absorb heat coil pipe 10 and with heat release coil pipe 11 by pipeline be connected between heat exchange pipeline 4 and air supply duct 8, cycle
Pump 12 realizes itself and boiler smoke and hair-dryer so that heat transferring medium circulation between heat absorption coil pipe 10 and heat release coil pipe 11
The air exchange heat of feeding improves the temperature that pressure fan 9 is sent into air to air preheater 2, and then promotes air preheater 2 and discharge fume temperature
Degree, reduces the minimum temperature difference on 2 heat-transfer surface of air preheater, effectively slows down air preheater 2 fouling and clogging of itself.Also, absorb heat coil pipe
10 are coiled in the outer wall of heat exchange pipeline 4, not will increase the resistance of air and gas system.
One embodiment according to the present utility model, first deduster 32 are electrostatic precipitator.
One embodiment according to the present utility model, second deduster 54 are bag filter.
In the embodiment above, the first deduster 32 is electrostatic precipitator, and electrostatic precipitator is trapped using high voltage direct current
Dust in boiler smoke, to remove most of flying dust in boiler smoke；Since most of flying dust in flue gas is by
One deduster 32 removes, and therefore, the second deduster 54 can be bag filter, and cost is reduced while improving efficiency of dust collection.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (5)
1. a kind of combination unit for delaying coal-burning boiler air preheater to block, which is characterized in that including：Heat exchanger (1), is sequentially communicated
Air preheater (2), the first deduster (3), heat exchange pipeline (4), the second deduster (5) on boiler flue (7) and air-introduced machine
(6), the outer air supply duct (8) of boiler flue (7), pressure fan (9) are set to and；The heat absorbing end of the heat exchanger (1) and institute
It states heat exchange pipeline (4) to be connected, the release end of heat of the heat exchanger (1) is connected with the air supply duct (8), the heat exchanger
(1) it is used to carry out heat exchange with the air in the boiler smoke and the air-supply passage in the boiler flue (7).
2. the combination unit according to claim 1 for delaying coal-burning boiler air preheater to block, which is characterized in that the heat exchange
Device (1) includes heat absorption coil pipe (10), heat release coil pipe (11) and the circulating pump (12) connected by pipeline, the heat exchanger (1)
Heat absorption coil pipe (10) is set to the inside of the heat exchange pipeline (4), and the heat release coil pipe (11) of the heat exchanger (1) is set to described
The inside of air supply duct (8).
3. the combination unit according to claim 1 for delaying coal-burning boiler air preheater to block, which is characterized in that the heat exchange
Device (1) includes heat absorption coil pipe (10), heat release coil pipe (11) and the circulating pump (12) connected by pipeline, the heat exchanger (1)
Heat absorption coil pipe (10) is coiled in the outer walls of the heat exchange pipeline (4), and the heat release coil pipe (11) of the heat exchanger (1) is coiled in described
The outer wall of air supply duct (8).
4. the combination unit according to claim 1 for delaying coal-burning boiler air preheater to block, which is characterized in that described first
Deduster (3) is electrostatic precipitator.
5. the combination unit according to claim 1 for delaying coal-burning boiler air preheater to block, which is characterized in that described second
Deduster (5) is bag filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721642090.XU CN207702507U (en) | 2017-11-30 | 2017-11-30 | A kind of combination unit for delaying coal-burning boiler air preheater to block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721642090.XU CN207702507U (en) | 2017-11-30 | 2017-11-30 | A kind of combination unit for delaying coal-burning boiler air preheater to block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207702507U true CN207702507U (en) | 2018-08-07 |
Family
ID=63024310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721642090.XU Expired - Fee Related CN207702507U (en) | 2017-11-30 | 2017-11-30 | A kind of combination unit for delaying coal-burning boiler air preheater to block |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207702507U (en) |
-
2017
- 2017-11-30 CN CN201721642090.XU patent/CN207702507U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 Termination date: 20181130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |