CN114165466B - Method for recovering after stall of one fan in double-row parallel axial-flow primary fan - Google Patents
Method for recovering after stall of one fan in double-row parallel axial-flow primary fan Download PDFInfo
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- CN114165466B CN114165466B CN202010950916.9A CN202010950916A CN114165466B CN 114165466 B CN114165466 B CN 114165466B CN 202010950916 A CN202010950916 A CN 202010950916A CN 114165466 B CN114165466 B CN 114165466B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007664 blowing Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/005—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a method for recovering after one fan stall occurs in a double-row parallel axial-flow primary fan, wherein at least one new wind side channel is arranged in an original system, the new wind side channels can be respectively communicated with two primary fans, and an exhaust valve is arranged on each new wind side channel; when one fan stalls in the double-row parallel axial-flow primary fan, the air quantity of the stall fan is gradually increased by closing the interconnection channel of the parallel primary fan, closing the original air side channel of the stall fan and opening the new air side channel, after the stall fan stably operates in a safe area, the original air side channel and the interconnection channel of the stall fan are gradually opened, and the new air side channel of the stall fan is gradually closed, so that the double-row primary fan can be operated in parallel again. The dilemma that the axial-flow primary fan cannot recover in operation after stall is effectively broken, so that the load operation and even the shutdown have to be reduced.
Description
Technical Field
The invention is applied to the field of power generation, and relates to a method for recovering after a fan stall occurs in a double-row parallel axial flow primary fan.
Background
The primary fan is used as an indispensable device of a pulverized coal boiler of a coal-fired power plant, provides primary air with certain pressure and certain flow for the boiler, dries pulverized coal and sends the pulverized coal into the burner, and the stable operation of the primary fan directly relates to the operation safety of the boiler.
Primary fans of coal-fired power plants are mainly divided into axial flow type and centrifugal type, and in the performance curve of the axial flow type primary fan (the performance curve schematic diagram of the axial flow type fan in fig. 1), a stall area is arranged at the upper left side, and the fans are generally not allowed to work in the stall area.
Because the axial flow fan has high efficiency, the primary fan of the large-scale coal-fired power plant unit at present commonly adopts the axial flow. In the operation process of the primary fan, the air quantity and the air pressure of 2 parallel fans are easy to be seriously unbalanced and stall due to the reasons of regulating failure or misoperation and the like, the stalled fans have sudden drop of the air pressure, lower flow and even the fans are changed from air outlet to reverse air inlet. And after the primary fan stalls, the possibility of running in parallel again is extremely low. This is a negative characteristic, as can be seen by reference to the stall zone boundary curve in fig. 1. When the stall boundary is entered, the air quantity of the stall fan is reduced, the air pressure is reduced along with the reduction, however, the air pressure is firm because the fan at the other side is still in normal operation. This forces the air volume of the stall blower to drop further, with a consequent further drop in air pressure, and this vicious circle cannot be stopped unless another blower is shut down. In this case, load-reducing operation generally has to be performed, and the furnace is shut down in severe cases.
In view of the above, the invention aims to provide a method for recovering after one fan stall occurs in a double-row parallel axial flow primary fan under the condition of no shutdown, which aims to solve the problem that the parallel axial flow primary fan can quickly recover to a safe operation condition when stall occurs.
Disclosure of Invention
The invention provides a method for recovering after one fan stall occurs in a double-row parallel axial-flow primary fan, wherein at least one new wind side channel is arranged in an original system, the new wind side channels are respectively communicated with two primary fans, and exhaust valves are arranged on the new wind side channels; when one fan stall occurs in the double-row parallel axial-flow primary fan, the method is recovered through the following steps:
a. closing at least one connecting door between the parallel primary fans, and cutting off an interconnection channel between the parallel primary fans;
b. closing an original wind side channel of the stall fan, and opening the new wind side channel by opening the exhaust valve to gradually increase the wind quantity of the stall fan;
c. After the stall fans stably run in the safety area, the original wind side channels of the stall fans and the interconnection channels between the two fans are gradually opened, and the new wind side channels communicated with the stall fans are gradually closed, so that the double-row primary fans run in parallel again.
Further, the new wind side channel is arranged between the primary air blower outlet baffle door and the primary air blower, and can also be arranged between the connecting door and the primary air blower outlet baffle door.
Further, the new wind side channel is disposed between the tie door and the primary air mover outlet baffle door.
Further, if the interconnecting channel includes two contact doors, the new wind side channel is disposed between the two contact doors.
Aiming at the dilemma that the load of a unit and even the forced blowing out of the parallel axial flow primary fan have to be reduced under the condition that the stall and the wind robbing occur in the traditional technology, the invention isolates the parallel axial flow primary fan from a system firstly and then provides a channel for releasing the wind quantity (towards the air) on the premise of not blowing out the furnace, thereby recovering the wind pressure of an outlet of the parallel axial flow primary fan, and then the parallel axial flow primary fan is in parallel with the system.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a performance curve of an axial flow fan;
FIG. 2 is a schematic system diagram of embodiment 1 of the present invention;
FIG. 3 is a system schematic diagram of embodiment 2 of the present invention;
Fig. 4 is a system schematic diagram of embodiment 3 of the present invention.
The marks in the figure:
1A/1B: axial-flow primary fan A/B;2A/2B: a baffle door A/B of an outlet of the primary fan; 3A/3B: an air preheater inlet baffle door A/B;4A/4B: an air preheater A/B;5A/5B: a cold primary air duct A/B;6: a contact door; 6A/6B: contact door A/B;7: a communication air duct; 8: an exhaust valve; 8A/8B: exhaust valve A/B.9: a new wind side channel; 9A/9B: new wind side channel a/B.
Detailed Description
Example 1
As shown in FIG. 2, the method for recovering after one fan stall occurs in the double-row parallel axial-flow primary fan comprises two axial-flow movable blade adjustable primary fans, namely, parallel axial-flow primary fans 1A and 1B, parallel air pre-heaters 4A and 4B, a cold primary air duct 5A/5B connecting the primary fans 1A/1B and the air pre-heaters 4A/4B, primary fan outlet baffle doors 2A/2B and air pre-heater inlet baffle doors 3A/3B arranged on the cold primary air duct 5A/5B, a connecting air duct 7 connecting the cold primary air ducts 5A and 5B, connecting doors 6A and 6B arranged on the connecting air duct 7, an exhaust valve 8 arranged on the connecting air duct 7 and a new wind side channel 9 arranged between the connecting air doors. The air preheater is characterized in that the interface of the connecting air duct 7 is positioned between the primary air blower outlet baffle door 2A/2B and the air preheater inlet baffle door 3A/3B, and the exhaust valve 8 is positioned between the connecting doors 6A and 6B. In the running process of the unit, when one fan stall occurs in the double-row parallel axial flow primary fan, for example, the primary fan 1A stalls, the recovery is realized through the following steps:
Step one, reducing the load of a unit, keeping the primary fans 1A and 1B to continue to operate, closing a connecting door 6B, and cutting off a parallel passage of the primary fans connected in parallel;
and step two, closing an inlet baffle door 3A of the air preheater, gradually opening a connecting door 6A and an exhaust valve 8, closing an original wind side channel of the stall fan, and gradually opening a new wind side channel. Gradually increasing the air quantity and the air pressure of the stall fan;
And thirdly, after the primary fan 1A resumes the normal operation condition, adjusting the primary fans 1A and 1B, and after ensuring that the operation conditions are consistent, gradually opening the air preheater inlet baffle door 3A and the contact door 6B, and gradually closing the exhaust valve 8 to ensure that the double-row primary fans are operated in parallel again.
Aiming at the dilemma that the load of a unit and even the forced blowing out of the parallel axial flow primary fan have to be reduced under the condition that the stall and the wind robbing occur in the traditional technology, the invention isolates the parallel axial flow primary fan from a system firstly and then provides a channel for releasing the wind quantity (towards the air) on the premise of not blowing out the furnace, thereby recovering the wind pressure of an outlet of the parallel axial flow primary fan, and then the parallel axial flow primary fan is in parallel with the system.
Example 2
As shown in FIG. 3, the method for recovering after one fan stall occurs in the double-row parallel axial-flow primary fan comprises two axial-flow movable blade adjustable primary fans, namely, parallel axial-flow primary fans 1A and 1B, parallel air pre-heaters 4A and 4B, a cold primary air duct 5A/5B connecting the primary fans 1A/1B and the air pre-heaters 4A/4B, a primary fan outlet baffle door 2A/2B and an air pre-heater inlet baffle door 3A/3B arranged on the cold primary air duct 5A/5B, a connecting air duct 7 connecting the cold primary air ducts 5A and 5B, a connecting door 6 arranged on the connecting air duct 7, exhaust valves 8A and 8B arranged on the connecting air duct 7 and new air side channels 9A and 9B arranged on the connecting air duct. The air preheater is characterized in that the interface of the connecting air duct 7 is positioned between the primary air blower outlet baffle door 2A/2B and the air preheater inlet baffle door 3A/3B, and the exhaust valves 8A and 8B are positioned at two sides of the connecting door 6.
In the running process of the unit, when one fan stall occurs in the double-row parallel axial flow primary fan, for example, the primary fan 1A stalls, the recovery is realized through the following steps:
step one, reducing the load of a unit, keeping the primary fans 1A and 1B to continue to operate, closing a connecting door 6, and cutting off a parallel passage of the primary fans connected in parallel;
and step two, closing an inlet baffle door 3A of the air preheater, gradually opening an exhaust valve 8A, closing an original wind side channel of the stall fan, and gradually opening a new wind side channel. Gradually increasing the air quantity and the air pressure of the stall fan;
And thirdly, after the primary fan 1A resumes the normal operation condition, adjusting the primary fans 1A and 1B, and after the operation condition is consistent, gradually opening the air preheater inlet baffle door 3A and the contact door 6, and gradually closing the exhaust valve 8A to ensure that the double-row primary fans are operated in parallel again.
Aiming at the dilemma that the load of a unit and even the forced blowing out of the parallel axial flow primary fan have to be reduced under the condition that the stall and the wind robbing occur in the traditional technology, the invention isolates the parallel axial flow primary fan from a system firstly and then provides a channel for releasing the wind quantity (towards the air) on the premise of not blowing out the furnace, thereby recovering the wind pressure of an outlet of the parallel axial flow primary fan, and then the parallel axial flow primary fan is in parallel with the system.
Example 3
As shown in FIG. 4, the method for recovering after one fan stall occurs in the double-row parallel axial-flow primary fan comprises two axial-flow movable blade adjustable primary fans, namely, parallel axial-flow primary fans 1A and 1B, parallel air pre-heaters 4A and 4B, a cold primary air duct 5A/5B connected with the primary fans 1A/1B and the air pre-heaters 4A/4B, an exhaust valve 8A/8B sequentially arranged on the cold primary air duct 5A/5B, a primary fan outlet baffle door 2A/2B and an air pre-heater inlet baffle door 3A/3B, a connecting air duct 7 connected with the cold primary air ducts 5A and 5B, a connecting door 6 arranged on the connecting air duct 7, and new air side channels 9A and 9B arranged at the outlets of the primary air fans. The air preheater is characterized in that the interface of the communication air duct 7 is positioned between the primary air blower outlet baffle door 2A/2B and the air preheater inlet baffle door 3A/3B.
In the running process of the unit, when one fan stall occurs in the double-row parallel axial flow primary fan, for example, the primary fan 1A stalls, the recovery is realized through the following steps:
step one, reducing the load of a unit, keeping the primary fans 1A and 1B to continue to operate, closing a connecting door 6, and cutting off a parallel passage of the primary fans connected in parallel;
And step two, closing an outlet baffle door 2A of the primary fan, gradually opening an exhaust valve 8A, closing an original wind side channel of the stall fan, and gradually opening a new wind side channel. Gradually increasing the air quantity and the air pressure of the stall fan;
And thirdly, after the primary fan 1A resumes the normal operation condition, adjusting the primary fans 1A and 1B, and after ensuring that the operation conditions are consistent, gradually opening the primary fan outlet baffle door 2A and the contact door 6, and gradually closing the exhaust valve 8A to ensure that the double-row primary fans are operated in parallel again.
Aiming at the dilemma that the load of a unit and even the forced blowing out of the parallel axial flow primary fan have to be reduced under the condition that the stall and the wind robbing occur in the traditional technology, the invention isolates the parallel axial flow primary fan from a system firstly and then provides a channel for releasing the wind quantity (towards the air) on the premise of not blowing out the furnace, thereby recovering the wind pressure of an outlet of the parallel axial flow primary fan, and then the parallel axial flow primary fan is in parallel with the system.
Aiming at the dilemma that the load of a unit and even the forced blowing out of the parallel axial flow primary fan have to be reduced under the condition that the stall and the wind robbing occur in the traditional technology, the invention isolates the parallel axial flow primary fan from a system firstly and then provides a channel for releasing the wind quantity (towards the air) on the premise of not blowing out the furnace, thereby recovering the wind pressure of an outlet of the parallel axial flow primary fan, and then the parallel axial flow primary fan is in parallel with the system.
Specific embodiments of the present invention are described in detail above. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (4)
1. The method for recovering after one fan stall occurs in the double-row parallel axial-flow primary fans is characterized in that at least one new wind side channel is arranged in an original system, the new wind side channels are respectively communicated with the two primary fans, and exhaust valves are arranged on the new wind side channels; when one fan stall occurs in the double-row parallel axial-flow primary fan, the method is recovered through the following steps:
a. closing at least one connecting door between the parallel primary fans, and cutting off an interconnection channel between the parallel primary fans;
b. closing an original wind side channel of the stall fan, and opening the new wind side channel by opening the exhaust valve to gradually increase the wind quantity of the stall fan;
c. After the stall fans stably run in the safety area, the original wind side channels of the stall fans and the interconnection channels between the two fans are gradually opened, and the new wind side channels communicated with the stall fans are gradually closed, so that the double-row primary fans run in parallel again.
2. A method of recovering after occurrence of a stall in a twin-row parallel axial flow primary fan in accordance with claim 1 wherein said new wind side passage is provided between the primary fan outlet damper door and the primary fan.
3. A method of recovering after a stall in a twin-row parallel axial flow primary fan as defined in claim 1 wherein said new wind side passage is provided between the tie gate and the primary fan outlet damper gate.
4. A method of recovering after a stall in a twin-row parallel axial flow primary fan according to claim 1, wherein if said interconnecting passage includes two tie gates, said new wind side passage is disposed between said two tie gates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010950916.9A CN114165466B (en) | 2020-09-11 | 2020-09-11 | Method for recovering after stall of one fan in double-row parallel axial-flow primary fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010950916.9A CN114165466B (en) | 2020-09-11 | 2020-09-11 | Method for recovering after stall of one fan in double-row parallel axial-flow primary fan |
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| Publication Number | Publication Date |
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| CN114165466A CN114165466A (en) | 2022-03-11 |
| CN114165466B true CN114165466B (en) | 2024-06-14 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
| CN104074789A (en) * | 2014-07-04 | 2014-10-01 | 国家电网公司 | Novel energy saving method for induced draught fan |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3290078B2 (en) * | 1996-10-24 | 2002-06-10 | 株式会社日立製作所 | Axial-flow blower and damper control method and device therefor |
| US5782603A (en) * | 1997-01-03 | 1998-07-21 | Virginia Tech Intellectual Properties, Inc. | Process and apparatus for recovery from rotating stall in axial flow fans and compressors |
| CN104533818B (en) * | 2014-12-22 | 2016-09-07 | 大唐贵州发耳发电有限公司 | A kind of parallel fan automatic adjusting balance control system |
| CN107219809B (en) * | 2016-11-24 | 2019-07-23 | 浙江浙能中煤舟山煤电有限责任公司 | The prevention method of primary air fan stall in primary air system |
| CN109737090B (en) * | 2019-01-23 | 2021-04-30 | 北京智拓博科技有限公司 | Multi-unit parallel air blower system and control method thereof |
| 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 |
| CN110953178A (en) * | 2019-12-06 | 2020-04-03 | 华北电力科学研究院有限责任公司 | Stall early warning method and system for parallel running fans |
| CN110985429A (en) * | 2019-12-17 | 2020-04-10 | 浙江浙能技术研究院有限公司 | Control device and method for detecting and eliminating fan stall |
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2020
- 2020-09-11 CN CN202010950916.9A patent/CN114165466B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
| CN104074789A (en) * | 2014-07-04 | 2014-10-01 | 国家电网公司 | Novel energy saving method for induced draught fan |
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