CN107869729A - Station boiler secondary air register adjusts air control system and method automatically - Google Patents
Station boiler secondary air register adjusts air control system and method automatically Download PDFInfo
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- CN107869729A CN107869729A CN201711303597.7A CN201711303597A CN107869729A CN 107869729 A CN107869729 A CN 107869729A CN 201711303597 A CN201711303597 A CN 201711303597A CN 107869729 A CN107869729 A CN 107869729A
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- Prior art keywords
- secondary air
- temperature
- control system
- sensor
- burner hearth
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/005—Regulating air supply or draught using electrical or electromechanical means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses station boiler secondary air register to adjust air control system and method automatically, the system includes the differential pressure measurement device between the coal-supplying amount measurement sensor, Secondary Air sensor for measuring temperature and secondary air box and the burner hearth that are connected with scattered control system, differential pressure measurement device and airdoor control executing agency between the Wind Coverage Calculation module being connected with Secondary Air pressure difference, temperature adjustmemt module, Secondary Air sensor for measuring temperature, secondary air box and burner hearth；Power station scattered control system is according to the differential pressure measurement signal between the coal-supplying amount measurement signal, Secondary Air temperature measurement signal, secondary air box and the burner hearth that collect corresponding burner, theoretical secondary air flow needed for the calculating of Wind Coverage Calculation module, through Secondary Air pressure difference, temperature adjustmemt module according to the pressure difference signal between Secondary Air temperature measurement signal and secondary air box and burner hearth, calculate actually required throttle opening, export to airdoor control executing agency, so as to realize automatically controlling for Secondary Air air quantity, meets the needs of efficient stable burning is to Secondary Air air distribution.
Description
Technical field
The present invention relates to the automatic control technology field of coal-fired station, and in particular to a kind of station boiler Secondary Air
Door is automatic to adjust air control system and method.
Background technology
With the fast development of power industry, the environmental protection pressure of getting worse is faced, persistently propulsion energy resource structure is adjusted for country
Whole, the clean energy resource such as wind energy, solar energy has obtained development continuously and healthily.Have yet with clean energy resourcies such as wind energy, solar energy
There are randomness and intermittent feature, a large amount of wind-force, photo-voltaic power generation station are concentrated to build and contradicted with peak load regulation network power outage, made
Consumption situation into the clean energy resource such as wind-powered electricity generation and solar energy is increasingly severe, and fired power generating unit faces unprecedented depth peak regulation pressure
Power, long-term underload is with quick significantly variable load operation by as following new normality of fired power generating unit.Wherein boiler is always electricity
In factory's operation problem most concentrate, accident rate highest equipment, boiler combustion is to influence whole power plant economy and security
Determinant.In design conditions or rated loan condition, preferable combustion efficiency can be typically obtained, but following long-term low
During load and quick significantly variable load operation, be present larger change in total amount of fuel and its distribution in stove, therefore match somebody with somebody
Air control system is very crucial.
The investing method of Secondary Air plays an important role to combustion stability and burnout, especially in underload and quickly
During varying duty, the control of its air quantity directly determines the combustion efficiency in whole burner hearth.In theory when the ature of coal and coal that use
The timing of amount one, primary air flow are just determined, and at this moment required secondary air flow also determines therewith.For the boiler run,
Because burner nozzle structure is unchanged, therefore secondary wind speed only changes with secondary air flow.Secondary Air is mixed after breeze airflow catches fire
Enter.Because the viscosity of thermal-flame is very big, Secondary Air must can just penetrate flame with very high speed, to strengthen air and Jiao
The contact and mixing of surfaces of carbon particles, therefore generally secondary wind speed is enhanced about more than once than primary air velocity.Air distribution mode not only influences
Combustion stability and efficiency of combustion, slagging, the change of flame kernel height, the control of furnace outlet gas temperature are also relate to, so as to,
Further influence overheating steam temperature and reheat steam temperature.So the control of secondary air register aperture directly affects secondary air flow, so as to influence
Burning.
Found by investigation and analysis, current domestic power plant's secondary air register regulation technology has the problem of universal and defect.
First, secondary air flow corresponding to single burner is complicated because duct cross-section changes, and typically can not all meet to sense
The demand of upstream and downstream long enough straight length needed for device arrangement, accurate measurement, therefore the air distribution of secondary air register at present can not be realized
Control is substantially at opened loop control state, namely specifies throttle opening according to fuel quantity, can not be carried out mostly by actual air volume
Feedback compensation, there is feedback compensation also larger uncertainty to be present because air measuring precision and reliability are relatively low in time.
Secondly, secondary air register aperture does not determine the size of air quantity and wind speed individually, because actually required air quantity namely list
Time inner second air oxygenous absolute magnitude in position is removed with air door size mutually outside the Pass, also with pressure difference before and after Secondary Air temperature and air door
It is relevant.Under same throttle opening, wind-warm syndrome is higher, then atmospheric density is lower, and oxygen content is relatively low under unit volume flow, actually required
Air quantity is more insufficient；Under same throttle opening, bellows burner hearth pressure difference is bigger, then drive air flow through air door potential energy it is higher, it is actual
Institute's required airflow is more sufficient.
The content of the invention
In view of problem above, the present invention proposes that a kind of station boiler secondary air register adjusts air control system and method, nothing automatically
Need reliability and the extremely low Secondary Air air measuring of precision can be achieved needed for Secondary Air air quantity accurate reliable control, while
Quickly directly required secondary air flow can be adjusted in place during the common quick significantly varying duty of unit, avoid Secondary Air from measuring
Measure the lengthy procedure of feedback compensation, adjust mediation vibration.
To achieve these goals, the present invention uses following technical scheme：
A kind of station boiler secondary air register adjusts wind control system, including the coal-supplying amount being connected with scattered control system 4 automatically
Differential pressure measurement device 3 between measurement sensor 1, Secondary Air sensor for measuring temperature 2 and secondary air box and burner hearth, in addition to
Secondary Air pressure difference, temperature adjustmemt module 6, the Wind Coverage Calculation module 5 being connected with Secondary Air pressure difference, temperature adjustmemt module 6, Secondary Air
Differential pressure measurement device 3 and airdoor control executing agency 7 between sensor for measuring temperature 2, secondary air box and burner hearth.
The station boiler secondary air register adjusts the control method of wind control system automatically, passes through existing power station decentralised control
The measurement signal for the coal-supplying amount measurement sensor 1 that system 4 corresponds to burner according to collecting, Secondary Air sensor for measuring temperature 2
Measurement signal, the measurement signal of differential pressure measurement device 3 between secondary air box and burner hearth, the basis in Wind Coverage Calculation module 5
The curvilinear function fx that manufactory provides) theoretical secondary air flow needed for calculating, through Secondary Air pressure difference, temperature adjustmemt module 6 according to next
Believe from the pressure difference of the differential pressure measurement device 3 between the temperature signal and secondary air box and burner hearth of Secondary Air sensor for measuring temperature 2
Number, according to conventional pressure differential and temperature adjustmemt standard or the actually required throttle opening of method corrected Calculation, export to airdoor control and hold
Row mechanism 7, so as to realize automatically controlling for Secondary Air air quantity, meets the needs of efficient stable burning is to Secondary Air air distribution.
Compared to the prior art compared with the present invention possesses following advantage：
The present invention Secondary Air air measuring extremely low without reliability and precision is the essence that required Secondary Air air quantity can be achieved
Will definitely be by control, while quickly directly can be adjusted to required secondary air flow during the common quick significantly varying duty of unit
Position, avoid the lengthy procedure of secondary air flow measurement feedback compensation, adjusted mediation vibration.Practical effect is very good, right
Unit oxygen content control and flameholding all have preferably performance.
Brief description of the drawings
Fig. 1 is present system connection diagram.
In figure：1-coal-supplying amount measurement sensor, 2-Secondary Air sensor for measuring temperature, 3-secondary air box and burner hearth it
Between differential pressure measurement device, 4-distributed monitoring control system, 5-Wind Coverage Calculation module, 6-Secondary Air pressure difference, temperature adjustmemt mould
Block, 7-airdoor control executing agency.
Embodiment
Embodiment：
The structural representation of secondary air register, coal-supplying amount are corresponded to for typical one layer of burner of Process In A Tangential Firing as shown in Figure 1
Differential pressure measurement device 3 between measurement sensor 1, Secondary Air sensor for measuring temperature 2, secondary air box and burner hearth is respectively with disperseing
Control system (DCS) 4 is connected；Scattered control system 4 is connected with Wind Coverage Calculation module 5；Wind Coverage Calculation module 5, secondary air temperature
The differential pressure measurement device 3 spent between measurement sensor 2 and secondary air box and burner hearth respectively with Secondary Air pressure difference, temperature adjustmemt module
6 are attached；Finally Secondary Air pressure difference, temperature adjustmemt module 6 are connected with airdoor control executing agency 7.
When the quick load up of unit, coal-supplying amount can quickly increase, and the corresponding signal of coal-supplying amount measurement sensor 1 quickly rings
Should, the pressure difference signal of differential pressure measurement device 3 between the signal of Secondary Air sensor for measuring temperature 2, secondary air box and burner hearth passes through
Wind Coverage Calculation module 5 quickly calculate needed for theoretical secondary air flow, through secondary wind pressure is poor, the corrected Calculation of temperature adjustmemt module 6 after
Actually required throttle opening, final throttle opening are quickly opened big and directly meet required oxygen amount of the current differential pressure with a temperature of, soon
Speed accurately supplies oxygen needed for the burner.
When unit rapid-transport line, coal-supplying amount can be reduced quickly, the corresponding quick phase of signal of coal-supplying amount measurement sensor 1
Should, the pressure difference signal of differential pressure measurement device 3 between the signal of Secondary Air sensor for measuring temperature 2, secondary air box and burner hearth passes through
Wind Coverage Calculation module 5 quickly calculate needed for theoretical secondary air flow, through secondary wind pressure is poor, the corrected Calculation of temperature adjustmemt module 6 after
Actually required throttle opening, final throttle opening quickly turn down and directly meet required oxygen amount of the current differential pressure with a temperature of, soon
Speed accurately supplies oxygen needed for the burner.
Claims (2)
1. a kind of station boiler secondary air register adjusts wind control system automatically, it is characterised in that：Including connecting with scattered control system (4)
Pressure difference between the coal-supplying amount measurement sensor (1), Secondary Air sensor for measuring temperature (2) and secondary air box and the burner hearth that connect is surveyed
Device (3), in addition to Secondary Air pressure difference, temperature adjustmemt module (6) are measured, is connected with Secondary Air pressure difference, temperature adjustmemt module (6)
Differential pressure measurement device (3) between Wind Coverage Calculation module (5), Secondary Air sensor for measuring temperature (2), secondary air box and burner hearth with
And airdoor control executing agency (7).
2. station boiler secondary air register adjusts the control method of wind control system automatically described in claim 1, it is characterised in that：Pass through
The measurement signal for the coal-supplying amount measurement sensor (1) that power station scattered control system (4) corresponds to burner according to collecting, Secondary Air
The measurement signal of differential pressure measurement device (3) between the measurement signal of sensor for measuring temperature (2), secondary air box and burner hearth,
Theoretical secondary air flow needed for being calculated in Wind Coverage Calculation module (5), through Secondary Air pressure difference, temperature adjustmemt module (6) according to from two
The pressure difference letter of differential pressure measurement device (3) between the temperature signal and secondary air box and burner hearth of secondary air temperature measurement sensor (2)
Number, actually required throttle opening is calculated, is exported to airdoor control executing agency (7), so as to realize the automatic control of Secondary Air air quantity
System, meets the needs of efficient stable burning is to Secondary Air air distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711303597.7A CN107869729A (en) | 2017-12-08 | 2017-12-08 | Station boiler secondary air register adjusts air control system and method automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711303597.7A CN107869729A (en) | 2017-12-08 | 2017-12-08 | Station boiler secondary air register adjusts air control system and method automatically |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107869729A true CN107869729A (en) | 2018-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711303597.7A Pending CN107869729A (en) | 2017-12-08 | 2017-12-08 | Station boiler secondary air register adjusts air control system and method automatically |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715288A (en) * | 2019-11-19 | 2020-01-21 | 哈尔滨龙高科环境科技有限公司 | Wall-attached air system for coal-fired boiler with four tangential corners |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002327915A (en) * | 2001-05-01 | 2002-11-15 | Ishikawajima Harima Heavy Ind Co Ltd | Mill primary air flow rate control device for pulverized coal burning boiler equipment |
| CN1480682A (en) * | 2003-07-02 | 2004-03-10 | 北京和利时***工程股份有限公司 | Automatic regulating system for combustion process of circulating fluid bed in boiler |
| CN103807852A (en) * | 2014-03-13 | 2014-05-21 | 青岛立宇科技开发有限公司 | Secondary air distributing device and method of pulverized coal boiler |
| CN104848248A (en) * | 2014-02-19 | 2015-08-19 | 宝山钢铁股份有限公司 | Method for controlling opening degrees of air door dampers of coal and gas mix-fired boiler |
| CN105160158A (en) * | 2015-08-12 | 2015-12-16 | 山东电力研究院 | Boiler secondary air damper characteristic test data processing method |
| CN107084404A (en) * | 2017-05-28 | 2017-08-22 | 贵州电网有限责任公司电力科学研究院 | A kind of accurate air distribution method of thermal power plant based on combustion control |
| CN207539925U (en) * | 2017-12-08 | 2018-06-26 | 西安热工研究院有限公司 | Station boiler secondary air register adjusts wind control system automatically |
-
2017
- 2017-12-08 CN CN201711303597.7A patent/CN107869729A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002327915A (en) * | 2001-05-01 | 2002-11-15 | Ishikawajima Harima Heavy Ind Co Ltd | Mill primary air flow rate control device for pulverized coal burning boiler equipment |
| CN1480682A (en) * | 2003-07-02 | 2004-03-10 | 北京和利时***工程股份有限公司 | Automatic regulating system for combustion process of circulating fluid bed in boiler |
| CN104848248A (en) * | 2014-02-19 | 2015-08-19 | 宝山钢铁股份有限公司 | Method for controlling opening degrees of air door dampers of coal and gas mix-fired boiler |
| CN103807852A (en) * | 2014-03-13 | 2014-05-21 | 青岛立宇科技开发有限公司 | Secondary air distributing device and method of pulverized coal boiler |
| CN105160158A (en) * | 2015-08-12 | 2015-12-16 | 山东电力研究院 | Boiler secondary air damper characteristic test data processing method |
| CN107084404A (en) * | 2017-05-28 | 2017-08-22 | 贵州电网有限责任公司电力科学研究院 | A kind of accurate air distribution method of thermal power plant based on combustion control |
| CN207539925U (en) * | 2017-12-08 | 2018-06-26 | 西安热工研究院有限公司 | Station boiler secondary air register adjusts wind control system automatically |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715288A (en) * | 2019-11-19 | 2020-01-21 | 哈尔滨龙高科环境科技有限公司 | Wall-attached air system for coal-fired boiler with four tangential corners |
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