CN107084404A - A kind of accurate air distribution method of thermal power plant based on combustion control - Google Patents
A kind of accurate air distribution method of thermal power plant based on combustion control Download PDFInfo
- Publication number
- CN107084404A CN107084404A CN201710393922.7A CN201710393922A CN107084404A CN 107084404 A CN107084404 A CN 107084404A CN 201710393922 A CN201710393922 A CN 201710393922A CN 107084404 A CN107084404 A CN 107084404A
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- coal
- air
- secondary air
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/16—Controlling secondary air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/02—Solid fuels
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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 a kind of accurate air distribution method of thermal power plant based on combustion control, it includes：Step 1, set up layer burner secondary air flow G and the pressure of bellows P, throttle opening k function expression；Step 2, according to every coal pulverizer coal-supplying amount calculate burning the institute i.e. target air volume G1 of required airflow；Step 3, the secondary air register aperture for automatically adjusting according to target air volume G1 the coal pulverizer respective layer burner, make layer burner secondary air flow G be equal to target air volume G1, oxygen are provided for the complete burning of coal dust；Control tracking unit load coal-fired in the control strategy of prior art thermal power unit boiler is solved to be adjusted, burning secondary air is empirically matched manually with custom, because the degree of accuracy that artificial experience adjusts burning air distribution is not high, cause partial combustion region air quantity excessive or anoxycausis, cause unstable combustion in stove, the technical problems such as boiler extinguishment can be also caused when serious.
Description
Technical field
Burning optimization control is based on the invention belongs to power plant boiler operation control technology field, more particularly to a kind of thermal power plant
The accurate air distribution method of system.
Background technology
Coal-fired boiler in thermal power plant is the boiler plant using coal dust as fuel, and boiler includes combustion system, First air system
System, secondary air system etc., the main function of First air is pulverized coal conveying to burner hearth and provides the oxygen at burning initial stage, Secondary Air
Main function is aftercombustion required air quantity, strengthens flow perturbation, promotes the backflow of high warm flue gas, it is ensured that coal dust it is complete
Burning.First air enters burner hearth by way of coal dust is carried after coal pulverizer with wind powder mixture through burner, and Secondary Air passes through
The overfire air port of burner introduces burner hearth, by adjusting the secondary air register aperture of burner, can improve or be lowered into coal
The Secondary Air air quantity of powder burner.
To the thermal power generation unit of current high parameter Large Copacity, unit quick response load at the appointed time is often required that
Be widely varied.Due to coal dust, residence time is shorter in burner hearth, to create good burning situation, it is ensured that the peace of boiler
Full economical operation, it is necessary to rationally carry out the Secondary Air proportioning of boiler.To respond the load variations of unit, the Combustion System of boiler is
Air distribution is carried out to adjust corresponding secondary air flow proportioning according to the situation that puts into operation of fuel, to realize optimal combustion efficiency, because
This, air distribution mode to boiler and its automatically controls and proposes higher requirement.
At present, control coal-fired in the control strategy of thermal power unit boiler tracking unit load is adjusted, burning auxiliary
Secondary Air is empirically matched manually with custom, when unit load change, generally requires the burner two that individually put into operation to it
Secondary wind is matched manually, adjusts the size of aperture because manually adjusting the different and different of experience.Fired because artificial experience is adjusted
The degree of accuracy for burning air distribution is not high, causes partial combustion region air quantity excessive or anoxycausis, causes unstable combustion in stove, when serious
Boiler extinguishment can also be caused.Therefore, current air distribution mode can not carry out rational Secondary Air configuration to boiler, so as to influence pot
The security and economy of stove operation.
The content of the invention
The technical problem to be solved in the present invention：A kind of accurate air distribution method of thermal power plant based on combustion control is provided,
Coal-fired control tracking unit load is adjusted in control strategy to solve prior art thermal power unit boiler, burning auxiliary
Secondary Air is empirically matched manually with custom, when unit load change, it is necessary to burner Secondary Air that individually put into operation to it
Matched manually, adjust the size of aperture because manually adjusting the different and different of experience, because artificial experience regulation burning is matched somebody with somebody
The degree of accuracy of wind is not high, causes partial combustion region air quantity excessive or anoxycausis, causes unstable combustion in stove, can also when serious
Cause the technical problems such as boiler extinguishment.
Technical solution of the present invention：
A kind of accurate air distribution method of thermal power plant based on combustion control, it includes：
Step 1, set up layer burner secondary air flow G and the pressure of bellows P, throttle opening k function expression G=G (P,
k)；
Step 2, according to every coal pulverizer coal-supplying amount calculate burning the institute i.e. target air volume G1 of required airflow；
Target air volume G1=(the coal pulverizer coal-supplying amount × coal-air ratio × ature of coal biasing × layer biasing-ventilation of coal pulverizer one time)
×(1-k)
In formula：Coal-air ratio is total blast volume/total coal consumption under boiler design coal BMCR operating modes, and k is design coal BMCR works
Burnout degree air quantity accounts for secondary total wind air quantity ratio under condition；
Step 3, the secondary air register aperture for automatically adjusting according to target air volume G1 the coal pulverizer respective layer burner, fire layer
Burner secondary air flow G is equal to target air volume G1, and oxygen is provided for the complete burning of coal dust.
The secondary of the coal pulverizer respective layer burner is automatically adjusted according to target air volume G1 in step 3
The method of throttle opening is：
Target air volume G1 is compared with layer burner secondary air flow G, and big secondary air register is opened during (G1-G)/G1 ＞ 0.05；(G1-
G)/G1 ＜ -0.05 when turn down secondary air register；During -0.05≤(G1-G)/G1≤0.05, do not adjust.
Described ventilation of coal pulverizer carries the primary air flow that coal dust enters boiler furnace to enter coal pulverizer.
Secondary air register aperture is provided with lower bound control and high level warning device.
(P, acquisition methods k) are function expression G=G described in step 1：Tried by boiler cold-state aerodynamic field
Test, by regulating device of air door similar to apparatus for measuring air quantity, obtain air quantity under every layer of burner correspondence secondary air register different opening
Air quantity characteristic under characteristic, different the pressure of bellows, fitting obtains layer burner secondary air flow G and the pressure of bellows P, throttle opening k
Function.
Beneficial effects of the present invention：
In control method of the present invention, ature of coal biasing and layer biasing can be subject to manually according to coal varitation or Actual combustion situation
Adjustment, control ratio is relatively flexibly, reliably, it is ensured that automatically controlling correctly to track, and allow air quantity real-time tracking coal amount to change, in combustion
The general proportions of wind and coal are effectively have adjusted before burning in advance, preliminary burning coarse regulation are realized, in automatic control mode
Under also can according to the different of ature of coal, combustion conditions difference come the suitable air distribution of tissue.By it was verified that achieving preferably
Effect.
Easily implementation, practice examining effect of the invention are very good, in unit actual moving process, and input layer burner is matched somebody with somebody
The secondary air register of wind is automatic, and secondary air register, from motion tracking correspondence coal pulverizer coal-supplying amount, is the abundant burning that coal dust enters in burner hearth
Oxygen is provided, coal dust burn-off rate is improved, is easily implemented using of the invention, therefore can bring good economic benefit to fired power generating unit,
Meaning with popularization；Control tracking unit load coal-fired in the control strategy of prior art thermal power unit boiler is solved to enter
Row regulation, burning secondary air is empirically matched manually with custom, when unit load change is, it is necessary to individually throw it
Fortune burner Secondary Air is matched manually, the size of aperture is adjusted because manually adjusting the different and different of experience, due to artificial
The degree of accuracy of experience regulation burning air distribution is not high, causes partial combustion region air quantity excessive or anoxycausis, causes burning in stove
Shakiness, can also cause the technical problems such as boiler extinguishment when serious.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
A kind of accurate air distribution method of thermal power plant based on combustion control, it includes：
Step 1, set up layer burner secondary air flow G and the pressure of bellows P, throttle opening k function expression G=G (P,
k)；
(P, acquisition methods k) are function expression G=G described in step 1：Tested by cold air dynamic field, will
Regulating device of air door similar to apparatus for measuring air quantity, obtain air quantity characteristic under every layer of burner correspondence secondary air register different opening,
Air quantity characteristic under different the pressure of bellows, fitting obtains layer burner secondary air flow G and the pressure of bellows P, throttle opening k function.
And introduce current density and be modified.
Step 2, according to every coal pulverizer coal-supplying amount calculate burning the institute i.e. target air volume G1 of required airflow；
Target air volume G1=(the coal pulverizer coal-supplying amount × coal-air ratio × ature of coal biasing × layer biasing-ventilation of coal pulverizer one time)
×(1-k)
In formula：Coal-air ratio is total blast volume/total coal consumption under boiler design coal BMCR operating modes, and k is design coal BMCR works
Burnout degree air quantity accounts for secondary total wind air quantity ratio under condition；
Step 3, the secondary air register aperture for automatically adjusting according to target air volume G1 the coal pulverizer respective layer burner, fire layer
Burner secondary air flow G is equal to target air volume G1, and oxygen is provided for the complete burning of coal dust.
The method for automatically adjusting the secondary air register aperture of the coal pulverizer respective layer burner in step 3 according to target air volume G1
For：
Target air volume G1 is compared with layer burner secondary air flow G, and big secondary air register is opened during (G1-G)/G1 ＞ 0.05；(G1-
G)/G1 ＜ -0.05 when turn down secondary air register；During -0.05≤(G1-G)/G1≤0.05, do not adjust.
Described ventilation of coal pulverizer carries the primary air flow that coal dust enters boiler furnace to enter coal pulverizer.
Ature of coal biasing, layer are biased to fixed value in the target air volume calculation formula, can be according to ature of coal situation and each layer coal
Powder burner Actual combustion situation is manually adjusted.
Total blast volume needed for the boiler combustion is controlled by pressure fan according to total fuel quantity, unit thermic load, and burner hearth goes out
Mouth oxygen amount is modified to total blast volume.
Secondary air register aperture is provided with lower bound control and high level warning device.Lower bound prevents correspondence two when pulverizer capacity is smaller
Secondary throttle opening is smaller and stays certain cooling position aperture, and high level alarm is, when pulverizer capacity is excessive, to remind operations staff's note
Meaning coal pulverizer sharing of load.
Below in conjunction with the accompanying drawings and the present invention is described further specific embodiment.
For certain thermoelectric generator factory 600MW grade opposed firing boiler, during unit lifting load, coal pulverizer correspondence secondary air register
Put under automatic condition, secondary air register, air quantity tracking coal pulverizer coal-supplying amount characteristic are preferable, after pulverizer capacity increase, furnace entering volume
Increase, the increase of secondary air register aperture, oxygen needed for supplement coal dust firing, improves coal dust burn-off rate in time；When furnace coal weight reduction,
Secondary air register aperture reduces therewith, prevents excessive cold wind from entering coal dust firing in burner hearth influence stove.From automatically engaging rear unit
Running situation from the point of view of, boiler combustion is stable, and high combustion efficiency, economy makes moderate progress.
Claims (5)
1. a kind of accurate air distribution method of thermal power plant based on combustion control, it includes：
Step 1, set up layer burner secondary air flow G and the pressure of bellows P, throttle opening k function expression G=G (P, k)；
Step 2, according to every coal pulverizer coal-supplying amount calculate burning the institute i.e. target air volume G1 of required airflow；
Target air volume G1=(the coal pulverizer coal-supplying amount × coal-air ratio × ature of coal biasing × layer biasing-ventilation of coal pulverizer one time) ×
(1-k)
In formula：Coal-air ratio is total blast volume/total coal consumption under boiler design coal BMCR operating modes, and k is under design coal BMCR operating mode
Burnout degree air quantity accounts for secondary total wind air quantity ratio；
Step 3, the secondary air register aperture for automatically adjusting according to target air volume G1 the coal pulverizer respective layer burner, make a layer burner
Secondary air flow G is equal to target air volume G1, and oxygen is provided for the complete burning of coal dust.
2. a kind of accurate air distribution method of the thermal power plant according to claim 1 based on combustion control, it is characterised in that：
The method for automatically adjusting the secondary air register aperture of the coal pulverizer respective layer burner in step 3 according to target air volume G1 is：
Target air volume G1 is compared with layer burner secondary air flow G, and big secondary air register is opened during (G1-G)/G1 ＞ 0.05；(G1-G)/G1
Secondary air register is turned down during ＜ -0.05；During -0.05≤(G1-G)/G1≤0.05, do not adjust.
3. a kind of accurate air distribution method of the thermal power plant according to claim 1 based on combustion control, it is characterised in that：
Described ventilation of coal pulverizer carries the primary air flow that coal dust enters boiler furnace to enter coal pulverizer.
4. a kind of accurate air distribution method of the thermal power plant according to claim 1 based on combustion control, it is characterised in that：
Secondary air register aperture is provided with lower bound control and high level warning device.
5. a kind of accurate air distribution method of the thermal power plant according to claim 1 based on combustion control, it is characterised in that：
(P, acquisition methods k) are function expression G=G described in step 1：By Cold State Aerodynamic Field Test, by air door
Adjusting means obtains air quantity characteristic, difference under every layer of burner correspondence secondary air register different opening similar to apparatus for measuring air quantity
Air quantity characteristic under the pressure of bellows, fitting obtains layer burner secondary air flow G and the pressure of bellows P, throttle opening k function.
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| CN201710393922.7A CN107084404A (en) | 2017-05-28 | 2017-05-28 | A kind of accurate air distribution method of thermal power plant based on combustion control |
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| CN201710393922.7A CN107084404A (en) | 2017-05-28 | 2017-05-28 | A kind of accurate air distribution method of thermal power plant based on combustion control |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107869729A (en) * | 2017-12-08 | 2018-04-03 | 西安热工研究院有限公司 | Station boiler secondary air register adjusts air control system and method automatically |
| CN108800191A (en) * | 2018-06-29 | 2018-11-13 | 国网山东省电力公司电力科学研究院 | A kind of Dynamic Optimum method of tangential firing boiler Secondary Air air distribution |
| CN108954375A (en) * | 2018-07-18 | 2018-12-07 | 厦门邑通软件科技有限公司 | Saving coals from boiler control method |
| CN109990269A (en) * | 2019-04-23 | 2019-07-09 | 西安热工研究院有限公司 | A kind of W flame boiler allocation of the amount of air regulating system |
| CN113048509A (en) * | 2021-04-19 | 2021-06-29 | 贵州华电塘寨发电有限公司 | Air distribution control method and system for W-flame pulverized coal boiler |
| CN113836729A (en) * | 2021-09-27 | 2021-12-24 | 国能龙源环保有限公司 | Method for reducing content of combustible materials in fly ash of boiler of thermal power plant |
| CN115193570A (en) * | 2022-06-30 | 2022-10-18 | 国家能源集团谏壁发电厂 | Air distribution control method and device, storage medium and equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107869729A (en) * | 2017-12-08 | 2018-04-03 | 西安热工研究院有限公司 | Station boiler secondary air register adjusts air control system and method automatically |
| CN108800191A (en) * | 2018-06-29 | 2018-11-13 | 国网山东省电力公司电力科学研究院 | A kind of Dynamic Optimum method of tangential firing boiler Secondary Air air distribution |
| CN108800191B (en) * | 2018-06-29 | 2019-06-04 | 国网山东省电力公司电力科学研究院 | A kind of Dynamic Optimum method of tangential firing boiler Secondary Air air distribution |
| CN108954375A (en) * | 2018-07-18 | 2018-12-07 | 厦门邑通软件科技有限公司 | Saving coals from boiler control method |
| CN109990269A (en) * | 2019-04-23 | 2019-07-09 | 西安热工研究院有限公司 | A kind of W flame boiler allocation of the amount of air regulating system |
| CN113048509A (en) * | 2021-04-19 | 2021-06-29 | 贵州华电塘寨发电有限公司 | Air distribution control method and system for W-flame pulverized coal boiler |
| CN113836729A (en) * | 2021-09-27 | 2021-12-24 | 国能龙源环保有限公司 | Method for reducing content of combustible materials in fly ash of boiler of thermal power plant |
| CN115193570A (en) * | 2022-06-30 | 2022-10-18 | 国家能源集团谏壁发电厂 | Air distribution control method and device, storage medium and equipment |
| CN115193570B (en) * | 2022-06-30 | 2024-02-02 | 国家能源集团谏壁发电厂 | Air distribution control method, device, storage medium and equipment |
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Application publication date: 20170822 |