CN110186067A - A kind of cigarette air duct coupled system preventing fan stall - Google Patents
A kind of cigarette air duct coupled system preventing fan stall Download PDFInfo
- Publication number
- CN110186067A CN110186067A CN201910378320.3A CN201910378320A CN110186067A CN 110186067 A CN110186067 A CN 110186067A CN 201910378320 A CN201910378320 A CN 201910378320A CN 110186067 A CN110186067 A CN 110186067A
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- Prior art keywords
- air
- fan
- line
- introduced machine
- communication channel
- Prior art date
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Links
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 29
- 238000004891 communication Methods 0.000 claims abstract description 66
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 230000003447 ipsilateral effect Effects 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- PDFKPHMIDDIXLR-UHFFFAOYSA-N fantrip Chemical compound FC1=C(F)C(F)=C2C=C(C=C3C4C5=CC6=CC7=C(F)C(F)=C(C(=C7C=C6C=C5C(C5=CC6=CC7=C(F)C(F)=C(F)C(F)=C7C=C6C=C54)C3=C3)F)F)C3=CC2=C1F PDFKPHMIDDIXLR-UHFFFAOYSA-N 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- 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
- F04D27/009—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by bleeding, by passing or recycling fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/06—Regulating air supply or draught by conjoint operation of two or more valves or dampers
Abstract
The invention discloses a kind of cigarette air duct coupled systems for preventing fan stall.Currently, primary air fan and air-introduced machine stall problem are not yet solved very well, existing solution is unsatisfactory, and there are exhaust gas temperatures to increase, combustion stability is impacted, damper is easy the defects of stuck.Cigarette air duct coupled system of the invention include First air channel to secondary air channel the first communication channel and secondary air channel to back-end ductwork the second communication channel, by the through-current capacity for adjusting the first communication channel and the second communication channel, optimize the running operating point of primary air fan and air-introduced machine, so that air-introduced machine and primary air fan is maintained at safety zone operation, prevents fan stall.Cigarette air duct provided by the invention coupled system can effectively prevent fan stall suitable for different load conditions, and have energy-saving effect.
Description
Technical field
The invention belongs to air-blower control technical field, specifically a kind of cigarette air duct coupled systemes for preventing fan stall
System.
Background technique
Position of the fan operation operating point on fan performance curve than pressure energy and flow by determining, when running operating point is moved
Fan stall when moving stall line, blower pressure and flow become very unstable at this time, seriously affect the safety and stability of unit
Operation.Fan stall accident is likely to occur in arbitrary load operating condition, but most commonly seen with fan stall under running on the lower load.Low
Under load condition, primary air pressure is still very high, and the stoppage in transit of coal pulverizer majority keeps First air channel insufficient, when certain coal pulverizer is prominent
So when tripping, the First air channel moment of the coal pulverizer is closed, and primary air fan pressure moment increases, and induces primary air fan stall.
Equally, for air-introduced machine, exhaust gas volumn is significantly reduced under underload, and air-introduced machine stall risk increases.
Primary air fan stall in order to prevent, the common countermeasure of power plant are to open the cold air damper of stoppage in transit coal pulverizer, are increased
Add First air channel and a cold wind flow.There are obvious drawbacks for this operating method: on the one hand, since cold First air enters furnace
Thorax is reduced by the heat primary air amount and secondary air flow of air preheater, is made under the operation control strategy for keeping oxygen amount constant
Exhaust gas temperature rises, and boiler efficiency reduces；On the other hand, cold First air is sent directly into burner hearth and generates not to combustion stability in furnace
Benefit influences.
Stall occurs for air-introduced machine in order to prevent, and some units are provided with air-introduced machine and import and export bypass flue, other by adjusting
The recirculating mass of road flue makes air-introduced machine operate in safety zone.Because flue gas has corrosivity, bypass flue baffle is easy corrosion
It is stuck, influence regulation performance.
In conclusion primary air fan and air-introduced machine stall problem are not yet solved very well, existing solution is unsatisfactory,
There are exhaust gas temperatures to increase, combustion stability is impacted, damper is easy the defects of stuck.
Summary of the invention
In view of this, the present invention provides a kind of cigarette air duct coupled system for preventing fan stall, it is used to prevent First air
Machine and air-introduced machine stall, and minimize the adverse effect caused by combustion stability.
For this purpose, the technical solution adopted by the present invention are as follows: a kind of cigarette air duct coupled system for preventing fan stall, the cigarette
Air duct coupled system includes First air channel to the first communication channel of secondary air channel and secondary air channel to the of back-end ductwork
Two communication channels；By adjusting the through-current capacity of the first communication channel and the second communication channel, optimize the operation work of primary air fan and air-introduced machine
Condition point makes air-introduced machine and primary air fan be maintained at safety zone operation, prevents fan stall.
Further, first communication channel is equipped with isolating door and adjusts door, enters air preheater for connecting
First air channel and the secondary air channel for entering air preheater.
Further, second communication channel is equipped with isolating door and adjusts door, enters air preheater for connecting
Secondary air channel and the back-end ductwork for leaving air preheater.
Further, the through-current capacity is adjusted by following operating procedure:
1) air-introduced machine alarming line, air-introduced machine nargin line, primary air fan alarming line and primary are set separately on fan performance curve
Blower nargin line；
2) running operating point of real-time monitoring air-introduced machine: when air-introduced machine running operating point reaches at or above air-introduced machine alarming line,
Air-introduced machine is run to adjust air-introduced machine flow by the through-current capacity that the adjusting door of the second communication channel adjusts the second communication channel
Operating point is maintained at the control area between air-introduced machine alarming line and air-introduced machine nargin line；
3) running operating point of real-time monitoring primary air fan: when primary air fan running operating point reaches at or above primary air fan alarm
When line, the through-current capacity of the first communication channel is adjusted by the door that adjusts of the first communication channel, to adjust primary air fan flow, is made primary
Fan operation operating point is maintained at the control area between primary air fan alarming line and primary air fan nargin line；
4) when primary air fan trips, the first ipsilateral communication channel is closed with tripping primary air fan；When fan trip, with jump
The second ipsilateral communication channel of lock air-introduced machine is closed；When secondary air fan tripping, the first ipsilateral communication channel with tripping secondary air fan
It is closed with the second communication channel.
Further, in the step 2), if second further, channel, which adjusts door standard-sized sheet, can not still make air inducing
Machine running operating point enters the control area between air-introduced machine alarming line and air-introduced machine nargin line, then first increases secondary air fan and go out
Power, then adjust the second communication channel and adjust door aperture；If the increase of combustion product gases amount makes air-introduced machine running operating point from air-introduced machine report
Control area between alert line and air-introduced machine nargin line, which moves down, reaches nargin line, then reduces the through-current capacity of the second communication channel, until
Air-introduced machine running operating point returns to the control area between air-introduced machine alarming line and air-introduced machine nargin line, or until the second communication channel
Adjust Men Quanguan.
Further, in the step 3), when the primary air flow increase by coal pulverizer makes primary air fan run work
Control area of the condition point between primary air fan alarming line and primary air fan nargin line moves down when reaching nargin line, passes through first and connects
Channel adjusts the through-current capacity that door reduces the first communication channel, until primary air fan running operating point returns to primary air fan alarming line and one
Control area between secondary blower nargin line, or until the first communication channel adjusts Men Quanguan.
Further, the air-introduced machine alarming line is moved down to obtain by air-introduced machine stall line, the air-introduced machine nargin line
It moving down to obtain by air-introduced machine alarming line, the primary air fan alarming line is moved down to obtain by primary air fan stall line, and described one
Secondary blower nargin line is moved down to obtain by primary air fan alarming line.
Further, the offset between the stall line and alarming line is determined according to operating experience, increases offset
Amount adjusts door for cigarette air duct coupled system and acts earlier, to solve the problems, such as fan stall under more high load capacity；Reduce offset to use
Men Gengchi movement is adjusted in cigarette air duct coupled system, to solve the problems, such as fan stall under more underload.
Further, the offset between the alarming line and nargin line is determined according to operating experience, increases offset
The operating frequency for adjusting door for reducing cigarette air duct coupled system is measured, reduces offset for reducing blower power consumption.
Cigarette air duct provided by the invention coupled system can effectively prevent fan stall suitable for different load conditions,
And also have the advantages that the through-flow medium in the first communication channel and the second communication channel is dustless non-corrosive air,
It is beneficial to prevent isolating door and adjusting badge is puckery；Air in first communication channel forms hot wind after first passing through air preheater heating
It is sent into burner hearth, avoids the too low influence hearth combustion stability of temperature, while reducing exhaust gas temperature, there is energy-saving effect.
Detailed description of the invention
Fig. 1 is the schematic diagram of cigarette air duct coupled system in the specific embodiment of the invention；
Fig. 2 is air-introduced machine performance diagram in the specific embodiment of the invention；
Fig. 3 is primary air fan performance diagram in the specific embodiment of the invention.
Specific embodiment
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Offset numerical quantity between alarming line and nargin line as described below is not unique, only to specific embodiment into
Row citing description.
Establish cigarette air duct coupled system, the cigarette air duct coupled system includes First air channel to the of secondary air channel
One communication channel and secondary air channel to back-end ductwork the second communication channel；As shown in Figure 1, the connection of the first communication channel is pre- into air
The First air channel of hot device and the secondary air channel for entering air preheater, the connection of the second communication channel enter the two of air preheater
Secondary wind channel and the back-end ductwork for leaving air preheater, the first communication channel and the second communication channel are equipped with isolating door and adjusting
Door.
Through-current capacity is adjusted according to following operation method:
1) such as Fig. 2, air-introduced machine alarming line and air-introduced machine nargin line are set on air-introduced machine characteristic curve according to practical operating experiences,
Air-introduced machine alarming line moves down 1250Nm/kg by air-introduced machine stall line and obtains, and the air-introduced machine nargin line is by air-introduced machine alarming line
2500Nm/kg is moved down to obtain；Such as Fig. 3, primary air fan alarm is set on primary air fan characteristic curve according to practical operating experiences
Line and primary air fan nargin line, primary air fan alarming line move down 2000Nm/kg by primary air fan stall line and obtain, and primary air fan is abundant
Degree line moves down 4500Nm/kg by primary air fan alarming line and obtains.
2) running operating point of real-time monitoring air-introduced machine: when air-introduced machine running operating point reaches at or above air-introduced machine alarming line
When, air-introduced machine is transported to adjust air-introduced machine flow by the through-current capacity that the adjusting door of the second communication channel adjusts the second communication channel
Row operating point is maintained at the control area between air-introduced machine alarming line and air-introduced machine nargin line；If it is complete that the second communication channel adjusts door
The control area that air-introduced machine running operating point can not still entered between air-introduced machine alarming line and air-introduced machine nargin line is opened, then is first increased
Add secondary air fan to contribute, then door aperture is adjusted by the second communication channel；If the increase of combustion product gases amount makes air-introduced machine operating condition
Control area of the point between air-introduced machine alarming line and air-introduced machine nargin line, which moves down, reaches nargin line, then reduces the second communication channel
Through-current capacity, until air-introduced machine running operating point returns to the control area between air-introduced machine alarming line and air-introduced machine nargin line, or straight
Men Quanguan is adjusted to the second communication channel.
3) running operating point of real-time monitoring primary air fan: when primary air fan running operating point reaches at or above primary air fan
When alarming line, made by the through-current capacity that the adjusting door of the first communication channel adjusts the first communication channel to adjust primary air fan flow
Primary air fan running operating point is maintained at the control area between primary air fan alarming line and primary air fan nargin line；It is ground when passing through
The primary air flow increase of coal machine makes primary air fan running operating point between primary air fan alarming line and primary air fan nargin line
Control area moves down when reaching nargin line, adjusts the through-current capacity that door reduces the second communication channel by the first communication channel, until primary
Fan operation operating point returns to the control area between primary air fan alarming line and primary air fan nargin line, or until the first connection
Road adjusts Men Quanguan.
4) when primary air fan trips, the first ipsilateral communication channel is closed with tripping primary air fan；When fan trip,
The second ipsilateral communication channel is closed with tripping air-introduced machine；When secondary air fan tripping, ipsilateral with tripping secondary air fan first connects
Channel and the second communication channel are closed.
Claims (9)
1. a kind of cigarette air duct coupled system for preventing fan stall, it is characterised in that: the cigarette air duct coupled system includes one
Secondary wind channel to secondary air channel the first communication channel and secondary air channel to back-end ductwork the second communication channel；By adjusting the
The through-current capacity of one communication channel and the second communication channel optimizes the running operating point of primary air fan and air-introduced machine, makes air-introduced machine and primary
Blower is maintained at safety zone operation.
2. a kind of cigarette air duct coupled system for preventing fan stall according to claim 1, which is characterized in that described
One communication channel is equipped with isolating door and adjusts door, enters the First air channel of air preheater and into air preheater for connect
Secondary air channel.
3. a kind of cigarette air duct coupled system for preventing fan stall according to claim 2, which is characterized in that described
Two communication channels be equipped with isolating door and adjust door, for connect enter air preheater secondary air channel with leave air preheater
Back-end ductwork.
4. a kind of cigarette air duct coupled system for preventing fan stall according to claim 3, which is characterized in that described is logical
Flow is adjusted by following operating procedure:
1) air-introduced machine alarming line, air-introduced machine nargin line, primary air fan alarming line and primary are set separately on fan performance curve
Blower nargin line；
2) running operating point of real-time monitoring air-introduced machine: when air-introduced machine running operating point reaches at or above air-introduced machine alarming line,
Air-introduced machine is run to adjust air-introduced machine flow by the through-current capacity that the adjusting door of the second communication channel adjusts the second communication channel
Operating point is maintained at the control area between air-introduced machine alarming line and air-introduced machine nargin line；
3) running operating point of real-time monitoring primary air fan: when primary air fan running operating point reaches at or above primary air fan alarm
When line, the through-current capacity of the first communication channel is adjusted by the door that adjusts of the first communication channel, to adjust primary air fan flow, is made primary
Fan operation operating point is maintained at the control area between primary air fan alarming line and primary air fan nargin line；
4) when primary air fan trips, the first ipsilateral communication channel is closed with tripping primary air fan；When fan trip, with jump
The second ipsilateral communication channel of lock air-introduced machine is closed；When secondary air fan tripping, the first ipsilateral communication channel with tripping secondary air fan
It is closed with the second communication channel.
5. a kind of cigarette air duct coupled system for preventing fan stall according to claim 4, which is characterized in that the step
It is rapid 2) in, if the second communication channel adjust door standard-sized sheet still air-introduced machine running operating point can not be made to enter air-introduced machine alarming line and air inducing
Control area between machine nargin line then first increases secondary air fan power output, then adjusts the second communication channel and adjust door aperture；If combustion
Burning exhaust gas volumn increase moves down control area of the air-introduced machine running operating point between air-introduced machine alarming line and air-introduced machine nargin line
Reach nargin line, then reduce the through-current capacity of the second communication channel, until air-introduced machine running operating point returns to air-introduced machine alarming line and draws
Control area between blower nargin line, or until the second communication channel adjusts Men Quanguan.
6. a kind of cigarette air duct coupled system for preventing fan stall according to claim 4, which is characterized in that the step
It is rapid 3) in, when making primary air fan running operating point from primary air fan alarming line and First air by the increase of the primary air flow of coal pulverizer
Control area between machine nargin line moves down when reaching nargin line, passes through the first communication channel and adjusts door and reduces the logical of the first communication channel
Flow, until primary air fan running operating point returns to the control area between primary air fan alarming line and primary air fan nargin line,
Or until the first communication channel adjusts Men Quanguan.
7. a kind of cigarette air duct coupled system for preventing fan stall according to claim 4, which is characterized in that described draws
Blower alarming line is moved down to obtain by air-introduced machine stall line, and the air-introduced machine nargin line is moved down to obtain by air-introduced machine alarming line, institute
The primary air fan alarming line stated is moved down to obtain by primary air fan stall line, and the primary air fan nargin line is alarmed by primary air fan
Line moves down to obtain.
8. a kind of cigarette air duct coupled system for preventing fan stall according to claim 7, which is characterized in that the mistake
Offset between fast line and alarming line is determined according to operating experience, is increased offset for cigarette air duct coupled system and is adjusted door more
Early movement, to solve the problems, such as fan stall under more high load capacity；It is dynamic for cigarette air duct coupled system adjusting Men Gengchi to reduce offset
Make, to solve the problems, such as fan stall under more underload.
9. a kind of cigarette air duct coupled system for preventing fan stall according to claim 7, which is characterized in that the report
Offset between alert line and nargin line is determined according to operating experience, increases offset for reducing the adjusting of cigarette air duct coupled system
The operating frequency of door reduces offset for reducing blower power consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910378320.3A CN110186067A (en) | 2019-05-08 | 2019-05-08 | A kind of cigarette air duct coupled system preventing fan stall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910378320.3A CN110186067A (en) | 2019-05-08 | 2019-05-08 | A kind of cigarette air duct coupled system preventing fan stall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110186067A true CN110186067A (en) | 2019-08-30 |
Family
ID=67715996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910378320.3A Pending CN110186067A (en) | 2019-05-08 | 2019-05-08 | A kind of cigarette air duct coupled system preventing fan stall |
Country Status (1)
| Country | Link |
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| CN (1) | CN110186067A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153798A (en) * | 2021-05-13 | 2021-07-23 | 西安热工研究院有限公司 | System for solving stall and surge of axial flow type primary fan |
| CN114165466A (en) * | 2020-09-11 | 2022-03-11 | 上海申能电力科技有限公司 | Method for recovering stalled one fan in double-row parallel axial flow primary fan |
| CN114992150A (en) * | 2022-05-19 | 2022-09-02 | 西安热工研究院有限公司 | Early warning method and device for coal-fired power plant fan stall and storage medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114165466A (en) * | 2020-09-11 | 2022-03-11 | 上海申能电力科技有限公司 | Method for recovering stalled one fan in double-row parallel axial flow primary fan |
| CN113153798A (en) * | 2021-05-13 | 2021-07-23 | 西安热工研究院有限公司 | System for solving stall and surge of axial flow type primary fan |
| CN114992150A (en) * | 2022-05-19 | 2022-09-02 | 西安热工研究院有限公司 | Early warning method and device for coal-fired power plant fan stall and storage medium |
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