CN214619487U - Antifouling stifled fan heater hydrophobic construction of air preheater in winter - Google Patents
Antifouling stifled fan heater hydrophobic construction of air preheater in winter Download PDFInfo
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- CN214619487U CN214619487U CN202120357150.3U CN202120357150U CN214619487U CN 214619487 U CN214619487 U CN 214619487U CN 202120357150 U CN202120357150 U CN 202120357150U CN 214619487 U CN214619487 U CN 214619487U
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- pipeline
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- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 55
- 230000003373 anti-fouling effect Effects 0.000 title claims abstract description 11
- 238000010276 construction Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000005514 two-phase flow Effects 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
The utility model provides an antifouling stifled fan heater hydrophobic construction of air preheater in winter, its characterized in that: the main drainage pipe of the primary air heater is connected with a drain tank of the air heater through a pipeline and a valve, one end of the main drainage pipe is connected with the drain tank of the air heater, the other end of the main drainage pipe is connected with a steam exhaust device through a drainage pipeline, and a regulating valve group for draining water from the air heater to the steam exhaust device is arranged on the main drainage pipeline; the primary air heater drain main pipe is connected with the first fixed-row flash tank through a pipeline and an isolation valve, and the secondary air heater drain main pipe is connected with the second fixed-row flash tank through a pipeline and an isolation valve. The utility model provides an operation safe and reliable, avoid causing the antifouling stifled fan heater hydrophobic construction of air preheater winter of influence to other equipment and whole unit.
Description
Technical Field
The utility model relates to an antifouling stifled fan heater hydrophobic construction of air preheater in winter.
Background
At present, two sets of air heaters are respectively installed on a primary air cooling system and a secondary air cooling system of a power station boiler on two sides of the boiler, and primary air cooling and secondary air cooling are heated by steam of a low-pressure auxiliary steam header, so that the temperature of a metal wall of a cold end of an air preheater is increased, the comprehensive temperature of the cold end of the air preheater is guaranteed to be higher than the acid dew point temperature, the low-temperature corrosion of the air preheater is avoided, and meanwhile, the generation of ammonium bisulfate is prevented. The drainage system of the air heater comprises: 1. the system has more related equipment, large maintenance workload, frequent problems of a drain pump, a frequency converter and the like, so that the drain can only be discharged to a fixed-discharge flash tank to be wasted, and the freezing of the air heater caused by unsmooth drain possibly can be caused; 2. and after steam-water separation is realized, the drained water enters a drain tank of the air heater through a concentrated drain main pipe and is pumped into the fixed-discharge flash tank through a drain pump or directly flows to the fixed-discharge flash tank through a pipeline, and the drained water is discharged when the system is started or the drainage quality is unqualified.
The control of the air heater system is that the steam supply side is adjusted, the drain side is adjusted by only a manual throttling drain manual valve, the outlet air temperature of the air heater is controlled by the steam supply adjusting valve of each set of air heater, the heat exchange capacity of the air heater is controlled by the opening degree of the steam supply adjusting valve, and the drain temperature and the outlet air temperature are controlled by throttling through the manual valve on the drain side occasionally.
After the air heater system is put into operation, frequent faults of the drain valve occur, so that drainage is not smooth, the phenomena of freezing of the heat exchange tube of the air heater, water leakage and steam leakage due to frost cracking occur for many times, and the condition can be relieved after the drain valve is detached by a maintainer.
After the air heater system is put into operation, the hydrophobic pump of air heater and the hydrophobic control system of frequency conversion frequently break down, lead to hydrophobic can only arrange the flash tank to deciding through the pipeline, and few part is retrieved, causes the working medium to be extravagant in a large number, tries to pass through air heater hydrophobic pump recirculation pipe, hydrophobic pump outlet pipe way to steam exhaust device pipeline with hydrophobic directness, directly retrieves hydrophobic to steam exhaust device, realizes the working medium basically and retrieves.
After the primary improvement of the air heater system, the system operation is basically stable and reliable, and the air temperature at the outlet of the air heater can meet the requirement. With the increase of the operation time of the system, the reduction of the environmental temperature and the increase of the load of the boiler in the heating period in winter, the air temperature at the outlet of the air heater needs to be increased by a larger steam inlet amount, and the drainage temperature is gradually increased; under the condition of guaranteeing the outlet air temperature, the primary air heater and the secondary air heater have large deviation of the hydrophobic temperature due to different steam consumption, the water hammer phenomenon of the hydrophobic main pipe occurs, and the problem of leakage of the main pipe frequently occurs. In addition, a heating device in a plant area is hydrophobic, the hydrophobic water is drained to a primary air heater hydrophobic main pipe and a secondary air heater hydrophobic main pipe through a pipeline, the water hammer phenomenon of the primary air heater hydrophobic main pipe is aggravated due to the imbalance of the three-party hydrophobic temperature in the hydrophobic main pipe, packing and flange leakage frequently occurs to a valve related to the hydrophobic main pipe, and the hydrophobic main pipe leaks.
The existing drainage system of the air heater has a plurality of problems: when the steam trap breaks down, the steam-water separation function cannot be realized, only a small amount of hydrophobic steam passes through the steam trap, and the hydrophobic steam of the air heater cannot be discharged in time, so that a large amount of heating media (auxiliary steam) of the air heater cannot enter the air heater, the heat exchange capacity of the air heater is directly reduced, and the air temperature is improved very little; due to the limited drainage and discharge capacity, the circulation capacity of the whole system is greatly weakened, and the whole air heater system cannot normally operate. The hydrophobic can not in time discharge of air heater, have a large amount of hydrophobic to store up in the air heater, air heater itself can't further heated air, when ambient temperature reduced, the inside phenomenon of freezing of air heater probably can appear, lead to air heater heat exchange tube by the frost crack, take place to leak, cause the deposition of air heater, the deposition of air preheater cold junction, air heater, air preheater resistance increase, make the fan produce surge phenomenon, influence the normal safe operation of air preheater. The drainage of the existing air heater is directly connected to the side of the steam exhaust device through a pipeline, the existing steam trap is detached, steam which is not condensed possibly is discharged into the steam exhaust device, the back pressure of the unit can be influenced, and the safe operation of the unit is influenced. The equipment in the whole drainage system is more (including pipeline flange, gate valve, governing valve etc.), and the water hammer phenomenon of drainage main pipe is frequent, if certain equipment is sealed not tight and takes place to leak, also can cause very big influence to steam exhaust device's backpressure, influences the safe economic operation of whole unit even.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the drainage system of the existing air heater cannot meet the requirements of safe and reliable operation of the whole air heater system.
In order to solve the technical problem, the technical scheme of the utility model provide an antifouling stifled fan heater hydrophobic construction of air preheater in winter is provided, first fan heater and second fan heater including a cold wind system boiler both sides, third fan heater and fourth fan heater of secondary cold wind system boiler both sides, first fan heater, the second fan heater, third fan heater and fourth fan heater are equipped with the drain pipe respectively, the drain pipe connection of first fan heater and second fan heater is to the hydrophobic female pipe of a common fan heater, the drain pipe connection of third fan heater and fourth fan heater is to the hydrophobic female pipe of a common secondary fan heater, its characterized in that: the main drainage pipe of the primary air heater is connected with a drain tank of the air heater through a pipeline and a valve, one end of the main drainage pipe is connected with the drain tank of the air heater, the other end of the main drainage pipe is connected with a steam exhaust device through a drainage pipeline, and a regulating valve group for draining water from the air heater to the steam exhaust device is arranged on the main drainage pipeline; the primary air heater drain main pipe is connected with the first fixed-row flash tank through a pipeline and an isolation valve, and the secondary air heater drain main pipe is connected with the second fixed-row flash tank through a pipeline and an isolation valve.
Preferably, the air heater drain-to-exhaust device regulating valve group comprises an electric regulating valve, an electric stop valve, a manual stop valve and a bypass manual valve.
Preferably, the drainage pipeline is provided with an isolation manual valve before entering the steam exhaust device.
Preferably, a third set of drain stop valve of the air heater is arranged on a drain pipeline connecting the third air heater and the drain main pipe of the secondary air heater; a fourth set of drain stop valve of the air heater is arranged on a drain pipeline which connects the fourth air heater with the drain main pipe of the secondary air heater; the drainage stop valve of the third set of air heater and the drainage stop valve of the fourth set of air heater are respectively connected with a drainage main pipe of the primary air heater through a pipeline valve.
Preferably, a safety valve is arranged at the top of the steam trap of the air heater.
Preferably, the top of the steam trap of the air heater is provided with an on-site pressure gauge.
Preferably, the steam trap of the air heater is provided with a remote liquid level meter and an on-site liquid level meter.
Preferably, a drain sampling valve is arranged at the lower part of the drain tank of the air heater.
Preferably, remote thermometers are respectively arranged on a drain pipeline connecting the first air heater and the primary air heater drainage main pipe, a drain pipeline connecting the second air heater and the primary air heater drainage main pipe, a drain pipeline connecting the third air heater and the secondary air heater drainage main pipe, and a drain pipeline connecting the fourth air heater and the secondary air heater drainage main pipe.
Preferably, a first set of air heater stop valve and a second set of air heater stop valve are respectively arranged on a drain pipeline which is connected with the first air heater and the primary air heater drain main pipe and a drain pipeline which is connected with the second air heater and the primary air heater drain main pipe.
The utility model provides an operation safe and reliable, avoid causing the antifouling stifled fan heater hydrophobic construction of air preheater winter of influence to other equipment and whole unit, it has following advantage:
1) the defect of the drain main pipe of the air heater caused by water attack of the pipeline is reduced;
2) the power consumption and maintenance cost of the drain pump and the frequency converter are reduced;
3) most defects generated by drainage of the air heater in winter can be eliminated without quitting the operation of the air heater, and the air temperature at the inlet of the air preheater is not lower than 20 ℃, so that the risks of blockage of the air preheater and low-temperature corrosion of the air preheater are reduced;
4) the air heater system has the advantages of simple structure, convenient operation and control and low modification cost, ensures the normal safe operation of the air heater system, and avoids the influence on the safe and stable operation of equipment such as an air preheater, a fan, a steam exhaust device and the like.
Drawings
FIG. 1 is a diagram of a pre-retrofit system of the present invention;
in the figure: 1. a first air heater; 2. a second air heater; 3. a third air heater; 4. a fourth air heater; 5. a fixed-row flash tank (a self-heating air device drainage main pipe 6); 6. a main pipe of the air heater for draining water; 7. a drain pump of a drain tank of the air heater; 8. a liquid level meter of a drain tank of the air heater; 9. a drain tank of the air heater; 10. draining water from the air heater to a pipeline of a steam exhaust device; 11. a warm air device drain pump recirculation pipeline; 12. adjusting a valve group (a heater drains water to a steam exhaust device); 13. heating and draining in a plant area to a main drainage pipe of an air heater;
FIG. 2 is a diagram of the post-retrofit system of the present invention;
in the figure: 1. a first air heater; 2. a second air heater; 3. a third air heater; 4. a fourth air heater; 17. a fixed-row flash tank (a secondary air heater drainage main pipe 14); 18. a primary air heater drainage main pipe; 7. a drain pump of a drain tank of the air heater; 8. a liquid level meter of a drain tank of the air heater; 9. a drain tank of the air heater; 10. draining water from the air heater to a pipeline of a steam exhaust device; 11. a warm air device drain pump recirculation pipeline; 12. the air heater drains water to the steam exhaust device adjusting valve group; 19. heating and dewatering the plant area to a drain tank of a fan heater; 14. a secondary air heater drainage main pipe; 15. the secondary air heater drainage valve group drains water to the primary air heater drainage main pipe 18; 16. and a fixed-row flash tank (a primary air heater drainage main pipe 18).
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
Example 1
The utility model provides an antifouling stifled air heater hydrophobic construction of winter air preheater, includes first air heater 1 and second air heater 2, third air heater 3 and fourth air heater 4 of secondary cold wind system boiler both sides of primary cold wind system boiler both sides. The first air heater 1, the second air heater 2, the third air heater 3 and the fourth air heater 4 are respectively provided with a drain pipeline, the first air heater and the second air heater share one primary air heater drain main pipe 18, and the third air heater and the fourth air heater drain share one secondary air heater drain main pipe 14. The primary air heater drain main pipe 18 is connected with a heater drain tank 9 through a pipeline and a valve, a main drain pipeline is connected below the heater drain tank 9, and an electric regulating valve, an electric stop valve, a manual stop valve and a bypass manual valve are arranged on the main drain pipeline, namely the heater drains water to a steam exhaust device regulating valve group 12. The main drain pipe is connected with the steam exhaust device through a drain pipe, an isolation manual valve is arranged in front of the steam exhaust device, a primary air heater drain main pipe 18 is connected with the fixed-displacement flash tank 16 through a pipeline and an isolation valve, and a secondary air heater drain main pipe 14 is connected with the fixed-displacement flash tank 17 through a pipeline and an isolation valve. And a pipeline valve is respectively connected with a primary air heater drainage main pipe 15 in front of the third and fourth sets of air heater drainage stop valves.
Example 2
According to the drainage structure of the air preheater in winter for preventing fouling in the air heater in accordance with embodiment 1, the drainage systems of the first air heater 1, the second air heater 2, the third air heater 3 and the fourth air heater 4 are not provided with a drain valve. The drainage temperature and the temperature of the first air and the second air at the inlet of the air preheater are controlled within a qualified range through the throttling of the drainage valve group of the air heater and the steam supply regulating valve of the air heater.
Example 3
According to the hydrophobic structure of the air heater for preventing fouling of the air preheater in the winter of the embodiment 1 or 2, the hydrophobic bodies of the first air heater 1 and the second air heater 2 are collected in the same primary air heater hydrophobic main pipe 18, and the hydrophobic bodies of the third air heater 3 and the fourth air heater 4 are collected in the same secondary air heater hydrophobic main pipe 14. Respectively enters the drain tank 9 of the air heater through a pipeline valve. The phenomenon of water hammer caused by gas-liquid two-phase flow due to large deviation of the primary air heater drainage temperature and the secondary air drainage temperature is avoided.
Example 4
According to the embodiment 1 and fig. 2, in the drainage structure of the air preheater in winter, when the secondary air heater drainage main pipe 14 of the third air heater 3 and the fourth air heater 4 leaks and needs to be withdrawn from maintenance, the drainage structure can be connected to the primary air heater drainage main pipe 18 through the secondary air heater drainage valve group 15, so that the secondary air heater is prevented from being withdrawn from operation, the temperature of cold air at the inlet of the air preheater is ensured, and the purpose of overhauling the main pipe is achieved.
Example 5
According to the embodiment 1, in the antifouling and blockage drainage structure of the air preheater in winter, the main drainage pipeline at the outlet of the drainage tank 9 of the air heater directly drains the drainage of the air heater to the steam exhaust device. The liquid level of the drain tank 9 of the air heater controls the steam exhaust device to be vacuum-tight, the back pressure is not influenced, and the unit can run safely.
Claims (10)
1. The utility model provides an antifouling stifled fan heater hydrophobic construction of air preheater in winter, including first fan heater and the second fan heater of a cold wind system boiler both sides, third fan heater and the fourth fan heater of a cold wind system boiler both sides of secondary, first fan heater, the second fan heater, third fan heater and fourth fan heater are equipped with the drain pipe respectively, the drain pipe connection of the drain pipe of first fan heater and second fan heater is to the hydrophobic female pipe of a wind fan heater of sharing, the drain pipe connection of third fan heater and fourth fan heater is to the hydrophobic female pipe of a wind fan heater of sharing, its characterized in that: the main drainage pipe of the primary air heater is connected with a drain tank of the air heater through a pipeline and a valve, one end of the main drainage pipe is connected with the drain tank of the air heater, the other end of the main drainage pipe is connected with a steam exhaust device through a drainage pipeline, and a regulating valve group for draining water from the air heater to the steam exhaust device is arranged on the main drainage pipeline; the primary air heater drain main pipe is connected with the first fixed-row flash tank through a pipeline and an isolation valve, and the secondary air heater drain main pipe is connected with the second fixed-row flash tank through a pipeline and an isolation valve.
2. The drain structure of a fan heater for preventing fouling of a winter air preheater according to claim 1, wherein the set of valve for the fan heater drain to steam exhaust device includes an electric control valve, an electric stop valve, a manual stop valve and a bypass manual valve.
3. The drainage structure of a winter air preheater anti-fouling heater as claimed in claim 1, wherein the drainage pipeline is provided with an isolating manual valve before entering the steam exhaust device.
4. The hydrophobic structure of the air heater for preventing fouling of the air preheater in winter as claimed in claim 1, wherein a third set of hydrophobic stop valve of the air heater is arranged on a hydrophobic pipeline connecting the third air heater and the hydrophobic main pipe of the secondary air heater; a fourth set of drain stop valve of the air heater is arranged on a drain pipeline which connects the fourth air heater with the drain main pipe of the secondary air heater; the drainage stop valve of the third set of air heater and the drainage stop valve of the fourth set of air heater are respectively connected with a drainage main pipe of the primary air heater through a pipeline valve.
5. The hydrophobic structure of the air heater for preventing fouling of the air preheater in winter as claimed in claim 1, wherein a safety valve is disposed on the top of the hydrophobic tank.
6. The hydrophobic structure of the air heater for preventing fouling of the air preheater in a winter season as claimed in claim 1, wherein an on-site pressure gauge is arranged on the top of the hydrophobic tank of the air heater.
7. The hydrophobic structure of the air heater for preventing fouling of the air preheater in winter as claimed in claim 1, wherein the hydrophobic tank of the air heater is provided with a remote liquid level meter and an on-site liquid level meter.
8. The hydrophobic structure of the air heater for preventing fouling of the air preheater in winter as claimed in claim 1, wherein the hydrophobic sampling valve is disposed at the lower part of the hydrophobic tank of the air heater.
9. The hydrophobic structure of the air heater for preventing fouling of the air preheater in winter as claimed in claim 1,
the first air heater is connected with a drain pipeline of a primary air heater drain main pipe, the second air heater is connected with a drain pipeline of a primary air heater drain main pipe, the third air heater is connected with a drain pipeline of a secondary air heater drain main pipe, and remote thermometers are arranged on the fourth air heater and the drain pipeline of the secondary air heater drain main pipe respectively.
10. The hydrophobic structure of the air heater for preventing fouling of the air preheater in winter as claimed in claim 1,
and a first set of air heater stop valve and a second set of air heater stop valve are respectively arranged on a drain pipeline which is connected with the first air heater and the primary air heater drain main pipe and is connected with the second air heater and the primary air heater drain main pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120357150.3U CN214619487U (en) | 2021-02-04 | 2021-02-04 | Antifouling stifled fan heater hydrophobic construction of air preheater in winter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120357150.3U CN214619487U (en) | 2021-02-04 | 2021-02-04 | Antifouling stifled fan heater hydrophobic construction of air preheater in winter |
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| Publication Number | Publication Date |
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| CN214619487U true CN214619487U (en) | 2021-11-05 |
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| CN202120357150.3U Active CN214619487U (en) | 2021-02-04 | 2021-02-04 | Antifouling stifled fan heater hydrophobic construction of air preheater in winter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762430A (en) * | 2021-02-04 | 2021-05-07 | 华电新疆发电有限公司昌吉分公司 | Antifouling stifled fan heater hydrophobic construction of air preheater in winter |
-
2021
- 2021-02-04 CN CN202120357150.3U patent/CN214619487U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762430A (en) * | 2021-02-04 | 2021-05-07 | 华电新疆发电有限公司昌吉分公司 | Antifouling stifled fan heater hydrophobic construction of air preheater in winter |
| CN112762430B (en) * | 2021-02-04 | 2025-07-15 | 华电新疆发电有限公司昌吉分公司 | A heater drain structure for preventing air preheater from fouling and clogging in winter |
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