CN210088915U - Smoke and air duct coupling system for preventing fan stall - Google Patents
Smoke and air duct coupling system for preventing fan stall Download PDFInfo
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- CN210088915U CN210088915U CN201920654127.3U CN201920654127U CN210088915U CN 210088915 U CN210088915 U CN 210088915U CN 201920654127 U CN201920654127 U CN 201920654127U CN 210088915 U CN210088915 U CN 210088915U
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Abstract
The utility model discloses a prevent flue duct coupled system of fan stall. At present, the stall problem of a primary air fan and an induced draft fan is not well solved, the existing solution is not ideal, and the defects that the exhaust gas temperature is increased, the combustion stability is affected, a flue baffle is easy to block and the like exist. The utility model discloses a flue coupling system, which comprises a first connecting channel from a primary air channel to a secondary air channel and a second connecting channel from the secondary air channel to a tail flue; a dust remover and an induced draft fan are arranged on the tail flue; the primary air channel is provided with a primary air fan, and the secondary air channel is provided with a secondary air fan. The utility model discloses an adjust the through-flow volume that first intercommunication and second intercommunication were said, optimize the operating condition point of primary air fan and draught fan, make draught fan and primary air fan keep in safe region operation. The utility model provides a flue gas duct coupled system is applicable to different load operating modes, can effectively prevent fan stall to energy-conserving effect has.
Description
Technical Field
The utility model belongs to the technical field of fan control, specifically speaking is a prevent flue duct coupled system of fan stall.
Background
The position of the operating condition point of the fan on the fan characteristic curve is determined by specific pressure energy and flow, when the operating condition point moves to a stall line, the fan stalls, the pressure and the flow of the fan become unstable, and the safe and stable operation of the unit is seriously influenced. The fan stall event may occur at any load condition, but at low load conditions, fan stall is most common. Under the low-load working condition, the primary air pressure is still high, most of the coal mills are stopped to cause the primary air channel to be insufficient, when a certain coal mill suddenly trips, the primary air channel of the coal mill is instantly closed, the pressure of a primary fan is instantly increased, and the primary fan is induced to stall. Also, for the induced draft fan, the flue gas volume is obviously reduced under the low load, and the stalling risk of the induced draft fan is increased.
In order to prevent the stall of the primary air fan, a common method for dealing with the stall of the power plant is to open a cold air baffle of the coal mill, and increase a primary air channel and the flow of cold primary air. This operating method has obvious drawbacks: on one hand, as cold primary air enters the hearth, under the operation control strategy of keeping the oxygen content unchanged, the hot primary air quantity and the secondary air quantity of the air preheater are reduced, so that the exhaust gas temperature is increased, and the boiler efficiency is reduced; on the other hand, the direct feeding of cold primary air into the furnace chamber adversely affects the combustion stability in the furnace.
In order to prevent the induced draft fan from stalling, some units are provided with bypass flues of the inlet and the outlet of the induced draft fan, and the induced draft fan is operated in a safe area by adjusting the recirculation flow of the bypass flues. Because the flue gas has corrosivity, the bypass flue baffle is easy to corrode and clamp, and the adjusting performance is influenced.
In conclusion, the stalling problems of the primary air fan and the induced draft fan are not well solved, the existing solution is not ideal, and the defects that the exhaust gas temperature is increased, the combustion stability is affected, the flue baffle is easy to block and the like exist.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a prevent flue duct coupled system of fan stall, it is used for preventing primary air fan and draught fan stall to minimize the adverse effect that causes combustion stability.
Therefore, the utility model discloses a technical scheme do: a smoke and air duct coupling system for preventing a fan from stalling comprises a first connecting passage from a primary air passage to a secondary air passage and a second connecting passage from the secondary air passage to a tail flue; a dust remover and an induced draft fan are arranged on the tail flue; the primary air channel is provided with a primary air fan, and the secondary air channel is provided with a secondary air fan.
The utility model discloses an adjust the through-flow volume that first intercommunication and second intercommunication were said, optimize the operating condition point of primary air fan and draught fan, make draught fan and primary air fan keep in safe region operation, prevent the fan stall.
Furthermore, the first connecting channel is provided with a first isolating door and a first adjusting door which are used for connecting a primary air channel entering the air preheater and a secondary air channel entering the air preheater. The flow of the first connecting channel is regulated and controlled by the first isolation door and the first regulating door.
Furthermore, the primary air fan is positioned at the front end of the primary air channel.
Furthermore, the secondary air fan is positioned at the front end of the secondary air channel.
Furthermore, the second communicating channel is provided with a second isolating door and a second adjusting door which are used for connecting a secondary air channel entering the air preheater and a tail flue leaving the air preheater. And the flow of the second communication channel is adjusted and controlled through the second isolation door and the second adjusting door.
Furthermore, the dust remover and the induced draft fan are positioned at the tail end of the tail flue.
The utility model provides a flue gas duct coupled system is applicable to different load operating modes, can effectively prevent fan stall to still have following beneficial effect: through-flow media in the first communicating channel and the second communicating channel are dust-free and non-corrosive air, so that the blocking of the isolating door and the adjusting door can be prevented; the air in the first connecting channel is heated by the air preheater to form hot air and then is fed into the hearth, the influence of low temperature on the combustion stability of the hearth is avoided, the smoke exhaust temperature is reduced, and the energy-saving effect is achieved.
Drawings
Fig. 1 is a schematic view of a flue-air duct coupling system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The flue gas duct coupling system shown in fig. 1 comprises a first connecting passage from the primary air passage to the secondary air passage and a second connecting passage from the secondary air passage to the tail flue; the tail end of the tail flue is provided with a dust remover 8 and an induced draft fan 9; the primary air channel is provided with a primary fan 1, and the secondary air channel is provided with a secondary fan 2. The primary air fan 1 is positioned at the front end of the primary air channel, and the secondary air fan 2 is positioned at the front end of the secondary air channel.
The utility model discloses an adjust the through-flow volume that first intercommunication and second intercommunication were said, optimize the operating condition point of primary air fan and draught fan, make draught fan and primary air fan keep in safe region operation, prevent the fan stall.
The first connecting channel is provided with a first isolating door 4 and a first adjusting door 3, and is used for connecting a primary air channel entering the air preheater 5 and a secondary air channel entering the air preheater 5. And the second communicating channel is provided with a second isolating door 7 and a second adjusting door 6 which are used for connecting a secondary air channel entering the air preheater and a tail flue leaving the air preheater.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides a prevent flue duct coupled system of fan stall which characterized in that: the smoke and air channel coupling system comprises a first connecting channel from a primary air channel to a secondary air channel and a second connecting channel from the secondary air channel to a tail flue; a dust remover and an induced draft fan are arranged on the tail flue; the primary air channel is provided with a primary air fan, and the secondary air channel is provided with a secondary air fan.
2. The flue gas duct coupling system for preventing fan stall of claim 1, wherein the first connecting passage is provided with a first isolation gate and a first adjustment gate for connecting the primary air passage into the air preheater and the secondary air passage into the air preheater.
3. A flue-air duct coupling system for preventing fan stall as claimed in claim 2 wherein said primary fan is located at the forward end of the primary air duct.
4. A flue-air duct coupling system for preventing fan stall as claimed in claim 2 wherein said overfire air fan is located at the forward end of the overfire air duct.
5. The flue gas duct coupling system for preventing fan stall of claim 2, wherein the second connecting duct is provided with a second isolation door and a second adjustment door for connecting the overfire air passage into the air preheater and the back pass flue out of the air preheater.
6. The flue gas duct coupling system for preventing fan stall of claim 5, wherein the dust collector and the induced draft fan are located at the tail end of the back flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920654127.3U CN210088915U (en) | 2019-05-08 | 2019-05-08 | Smoke and air duct coupling system for preventing fan stall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920654127.3U CN210088915U (en) | 2019-05-08 | 2019-05-08 | Smoke and air duct coupling system for preventing fan stall |
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| Publication Number | Publication Date |
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| CN210088915U true CN210088915U (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920654127.3U Active CN210088915U (en) | 2019-05-08 | 2019-05-08 | Smoke and air duct coupling system for preventing fan stall |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186067A (en) * | 2019-05-08 | 2019-08-30 | 国网浙江省电力有限公司电力科学研究院 | A kind of cigarette air duct coupled system preventing fan stall |
-
2019
- 2019-05-08 CN CN201920654127.3U patent/CN210088915U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186067A (en) * | 2019-05-08 | 2019-08-30 | 国网浙江省电力有限公司电力科学研究院 | A kind of cigarette air duct coupled system preventing fan stall |
| CN110186067B (en) * | 2019-05-08 | 2024-06-04 | 国网浙江省电力有限公司电力科学研究院 | Smoke air duct coupling system for preventing fan from stalling |
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