CN106765281B - A kind of 900MW power boiler burning optimization air distribution method of adjustment - Google Patents

A kind of 900MW power boiler burning optimization air distribution method of adjustment Download PDF

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Publication number
CN106765281B
CN106765281B CN201611250991.4A CN201611250991A CN106765281B CN 106765281 B CN106765281 B CN 106765281B CN 201611250991 A CN201611250991 A CN 201611250991A CN 106765281 B CN106765281 B CN 106765281B
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China
Prior art keywords
load
oxygen amount
adjustment
boiler
air distribution
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CN106765281A (en
Inventor
姚国华
刘礼祯
陈涛
陆顺华
钟海
高磊
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SHANGHAI WAIGAOQIAO SECOND POWER GENERATING CO Ltd
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SHANGHAI WAIGAOQIAO SECOND POWER GENERATING CO Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING 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
    • F23L13/00Construction of valves or dampers for controlling air supply or draught
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N3/00Regulating air supply or draught
    • F23N3/06Regulating air supply or draught by conjoint operation of two or more valves or dampers

Abstract

The present invention relates to a kind of 900MW power boiler burning optimization air distribution methods of adjustment, comprising: the operation of drop oxygen amount, the adjustment Secondary Air air distribution method of operation.Compared with prior art, the present invention has effect good, and the net coal consumption rate of unit, the station service power consumption rate of boiler side subsidiary engine have the advantages that significantly reducing, greatling save the energy.

Description

A kind of 900MW power boiler burning optimization air distribution method of adjustment
Technical field
The present invention relates to one kind, more particularly, to a kind of 900MW power boiler burning optimization air distribution method of adjustment.
Background technique
From the point of view of my two boiler Actual combustion air distribution situations of company.Main problem is as follows:
1) secondary air flow is bigger than normal
Secondary air flow main characterization bigger than normal be exactly with from the point of view of comparison of domestic same type units under the conditions of same load, My the actual motion oxygen amount value of company's unit is obviously bigger than normal, that is to say, that actual motion air quantity is much higher than theoretical calculation air quantity.It is aobvious So, this phenomenon is all unfavorable for the safety economy environmental protection operation of boiler.
Firstly, enough air capacities are the necessary conditions of generation NOX object, and mistake from the point of view of the mechanism that boiler NOX object generates Big oxygen amount, that is, secondary air flow is exactly the breeding ground that the generation of NOX object provides.To seriously affect the environmental protection operation of unit.
Secondly, although excessive secondary air flow makes the burning of coal dust more abundant, but this only refers to oxygen amount one In a suitable range.If be also elevated beyond this range since the increase of air quantity is bound to cause wind pressure, so that coal dust flow velocity Increase, the ignition point of coal dust moves back.This plays negative interaction to burning is stablized in fact.
Third, as previously mentioned, excessive secondary air flow must can improve coal dust flow velocity significantly.This allows for coal dust in burner hearth Portion is shortened burning time, so that entire in-furnace temperature and flue-gas temperature be made to reduce, does not only increase boiler efficiency in this way Add, be reduction of entire boiler efficiency instead in a way, reduces the economy of boiler operatiopn.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of 900MW station boilers Burning optimization air distribution method of adjustment.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of 900MW power boiler burning optimization air distribution method of adjustment characterized by comprising the operation of drop oxygen amount, adjustment Secondary Air air distribution.
The Secondary Air air distribution adjusts
The test of burnout degree baffle opening, takes 900~450MW load section, with 50MW for a load breakpoints, in the load point While maintaining steady load, after-flame windshield plate is gradually turned down for one grade with 10%, observes the additional ventilation flap of each coal pulverizer The situation of change of aperture and unit DS NOx Est amount;
Oxygen amount test is dropped, 900~450MW load section is taken, with 50MW for a load breakpoints, maintains load in the load point While stabilization, with 0.1% for one grade, the biasing of boiler oxygen amount setting is reduced;After set steady, unit parameters are observed Situation of change;
The big bellows differential pressure Adjustment Tests of boiler, carry out more than unit load 700MW, with 50MW for a load breakpoints, After testing the new oxygen amount biasing having determined before being adjusted to, with 100pa for one grade, down-set big bellows differential pressure Controlling value.
Unit load 700MW or more reduces -1.5% operation of oxygen amount biasing, while the big bellows differential pressure controlling value of boiler is put 800Pa turns down burnt wind baffle opening minimum not less than 60%.
Unit load 700MW is hereinafter, reduce -1.2% operation of oxygen amount biasing, the big bellows differential pressure controlling value of boiler, which puts not do, to be had Body requirement turns down burnt wind baffle opening minimum not less than 80%.
Unit load 450MW is hereinafter, oxygen amount reduction, range of operation -0.8~1.2%.
Compared with prior art, effect of the present invention is good, and the net coal consumption rate of unit, the station service power consumption rate of boiler side subsidiary engine have It significantly reduces, greatlys save the energy, acquired economic benefit has some idea of.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, Obviously, described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on the implementation in the present invention Example, those of ordinary skill in the art's every other embodiment obtained without making creative work, is all answered Belong to the scope of protection of the invention.
From boiler oxygen amount, the big bellows differential pressure of boiler, the aperture of the small damper of each layer, these major parameters are set about.Pass through Test obtains a large amount of actual operating datas, then carries out analysis comparison to acquired data, finally sums up a whole set of optimization pot Furnace air distribution scheme.
The adjustment of Secondary Air air distribution
To the analysis of unit practical operation situation and the comb to change to the relevant parameter that may cause according to before Reason.Entire Secondary Air air distribution adjustment can be divided into several parts and execute.
The test of 2.1 burnout degree baffle openings
From the point of view of current operation actual conditions, our big bellows differential pressure setting is a constant straight line, is always It is adjusted according to this steady state value of 1000pa.Based on this premise, the setting value that we maintain this constant first is constant, does corresponding Burnout degree baffle opening test.It is desirable that with burnout degree baffle opening at this time, make one it is one-to-one with load Curve, and a reference value as next step test.
We take 900~450MW load section, with 50MW for a load breakpoints, maintain steady load in the load point Meanwhile after-flame windshield plate is gradually turned down for one grade with 10%.Observe the aperture and unit NOX of the additional ventilation flap of each coal pulverizer The situation of change of discharge amount.
2.2 drop oxygen amount tests
The burnout degree baffle opening test according to before, we have obtained the combustion for being more suitable our actual operating modes The curve of windshield plate aperture to the greatest extent, this curve and load correspond.In next drop oxygen amount test, all load section after-flames The aperture of windshield plate, test data obtained in the test of burnout degree baffle opening is configured according to before.
900~450MW load section is taken, with 50MW for a load breakpoints, while the load point maintains steady load, With 0.1% for one grade, the biasing of boiler oxygen amount setting is reduced.After set steady, the situation of change of unit parameters is observed.
The big bellows differential pressure Adjustment Tests of 2.3 boilers
Our known existing big bellows differential pressure settings are a constant straight lines, are according to this steady state value of 1000pa always To adjust.Only as unit load > 750MW, in the case where after-flame windshield plate standard-sized sheet, big bellows differential pressure can just be greater than This steady state value of 1000pa.And the aperture that we turn down after-flame windshield plate before can make this load point move down, it may be possible to 730MW is lower.But we reduce the setting value of oxygen amount at this time, and the effect to liquidate will be played to this partial action.At this point, By this series of adjustment, what we obtained is the big bellows differential pressure of a new correspondence different load.
Again because dropping between big bellows differential pressure and drop oxygen amount has inseparable relationship, before we have references to Oxygen amount testing program is dropped, the testing program as declined strong wind case differential pressure has been formulated:
1) before testing, the adjustment module for requiring thermal technology to drop the big bellows differential pressure of boiler first accomplishes to control in DCS;
2) test mainly carried out more than unit load 700MW, with 50MW be a load breakpoints, be adjusted to us it After the new oxygen amount biasing that preceding test has determined, with 100pa for one grade, the controlling value of down-set big bellows differential pressure.
2.4 test datas summarize
It is tested by above 3, we have obtained a large amount of basic datas on the basis of unit load, and following table is that unit exists When different load operating condition, obtained data list:
900MW
850MW
800MW
750MW
700MW
650MW
600MW
550MW
500MW
450MW
According to the project implementation process as shown above, up to 30 times or so all kinds of tests have been carried out, have been obtained a large amount of Basic data.By the analyses and comparison to these data, we readjust entire boiler combustion with subsystem, right The setting of key parameter involved in entire blowing system is standardized again, and the measure of specific implementation is as follows:
Unit load 700MW or more reduces -1.5% operation of oxygen amount biasing, while the big bellows differential pressure controlling value of boiler is put 800Pa suitably turns down burnt wind baffle opening minimum not less than 60%;
Unit load 700MW is hereinafter, reduce -1.2% operation of oxygen amount biasing, the big bellows differential pressure controlling value of boiler, which puts not do, to be had Body requirement suitably turns down burnt wind baffle opening minimum not less than 80%.
Unit load 450MW is hereinafter, oxygen amount does appropriate reduction, range of operation -0.8~-1.2%.
When variable load operation, if " wind-coal intersects limitation " occurs it may require that thermal technology suitably relaxes " wind-coal intersection limitation Value ", while oxygen amount setting value or big bellows differential pressure controlling value can be properly increased, it is put into again again after unit is stable;
When unit meets other misoperation operating conditions, oxygen amount, big bellows differential pressure, burnt wind can be restored according to disposition at that time The controlling value of baffle etc. is put into again again after unit normal operation.And carry out record of handing over to the next shift.
Comparability test data
2 months 2016, we engaged Ming Hua company to carry out " #5 furnace optimizing operating mode adjusts comparative test ", tested number According to display: when unit load 900MW, net coal consumption rate declines 1.8g/KWH, annual amount of energy saving: 1.8g/KWH × 7,700,000,000=13860 ≈14000T
Company in 2015 consumes the 544.46 yuan/ton of calculating of unit price of mark coal, saves nearly 7,600,000 yuan of fuel cost.
When unit load 650MW, net coal consumption rate declines 1.24g/KWH, annual amount of energy saving:
The ≈ of 1.24g/KWH × 7,700,000,000=9548 10000T
Company in 2015 consumes the 544.46 yuan/ton of calculating of unit price of mark coal, saves nearly 5,400,000 yuan of fuel cost.
Test report also shows, the DS NOx Est value of boiler export has dropped 100mg/Nm3 before implementing compared with scheme, thus I Again another available income, the i.e. decline of urea usage amount:
0.68 × 66.56% × 4345.35 ÷ (450-90)=5.4632T/mg
0.68T/h: under unit 900MW load, the NOX in flue gas is taken off 90mg/Nm3 by 450mg/Nm3 by denitrification apparatus It is needed per hour with 680kg urea;
66.56%:2015 company Annual rate of load condensate;
4345.35h:2015 year company Annual unit utilizes hourage;
(450-90) mg/Nm3: denitrification apparatus designed capacity is to take off the NOX in flue gas to 90 by 450.
5.4631 × 100=546.32 ≈ 550T
550 × 2200=1210000 member
By can be calculated above, boiler export NOX declines 100mg/Nm3, and annual urea expenditure will save 1,200,000 Member.
Both coal consumption for power generation and urea expenditures are added, our actual project yields of the Comparability test of Ming Hua company are passed through At 9,000,000 yuan or so.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right It is required that protection scope subject to.

Claims (3)

1. a kind of 900MW power boiler burning optimization air distribution method of adjustment characterized by comprising the operation of drop oxygen amount, adjustment two Secondary wind air distribution;
The Secondary Air air distribution adjusts
The test of burnout degree baffle opening, takes 900~450MW load section, with 50MW for a load breakpoints, maintains in the load point While steady load, after-flame windshield plate is gradually turned down for one grade with 10%, observes the aperture of the additional ventilation flap of each coal pulverizer And the situation of change of unit DS NOx Est amount;
Oxygen amount test is dropped, 900~450MW load section is taken, with 50MW for a load breakpoints, maintains steady load in the load point While, with 0.1% for one grade, reduce the biasing of boiler oxygen amount setting;After set steady, the change of unit parameters is observed Change situation;
The big bellows differential pressure Adjustment Tests of boiler, carry out more than unit load 700MW, with 50MW for a load breakpoints, are adjusting After the new oxygen amount biasing that the whole test before has determined, with 100pa for one grade, the control of down-set big bellows differential pressure Value;
Unit load 700MW or more reduces -1.5% operation of oxygen amount biasing, while the big bellows differential pressure controlling value of boiler puts 800Pa, Burnt wind baffle opening minimum is turned down not less than 60%.
2. a kind of 900MW power boiler burning optimization air distribution method of adjustment according to claim 1, which is characterized in that machine Group load 700MW is hereinafter, reduce -1.2% operation of oxygen amount biasing, the big bellows differential pressure controlling value of boiler, which is put, does not do specific requirement, closes Small burnt wind baffle opening minimum is not less than 80%.
3. a kind of 900MW power boiler burning optimization air distribution method of adjustment according to claim 1, which is characterized in that machine Group load 450MW is hereinafter, oxygen amount reduction, range of operation -0.8~1.2%.
CN201611250991.4A 2016-12-30 2016-12-30 A kind of 900MW power boiler burning optimization air distribution method of adjustment Active CN106765281B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101034009A (en) * 2007-04-09 2007-09-12 上海发电设备成套设计研究院 Online detecting, soot blowing and optimal energy-saving method for large coal-fired boiler
JP2009162130A (en) * 2008-01-08 2009-07-23 Yamatake Corp Fuel supply device
CN101498457A (en) * 2009-03-02 2009-08-05 杭州电子科技大学 Boiler combustion optimizing method
CN102734833A (en) * 2012-06-07 2012-10-17 中国神华能源股份有限公司 Boiler optimization method for reducing nitrogen oxide discharge
CN103225819A (en) * 2013-04-24 2013-07-31 广东电网公司电力科学研究院 Oxygen volume adjusting method and system for pulverized coal boiler after change of coal type
CN103234219A (en) * 2013-04-24 2013-08-07 广东电网公司电力科学研究院 Circumference air quantity adjustment method and system for pulverized coal boiler after fire coal kind changing
CN103672953A (en) * 2013-12-27 2014-03-26 广东省粤电集团有限公司珠海发电厂 Self-adaptive control method and system of combustion of multiple types of coal of boiler
CN105276611A (en) * 2015-11-25 2016-01-27 广东电网有限责任公司电力科学研究院 Adjustment and optimization method and system for combustion of power plant boiler

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101034009A (en) * 2007-04-09 2007-09-12 上海发电设备成套设计研究院 Online detecting, soot blowing and optimal energy-saving method for large coal-fired boiler
JP2009162130A (en) * 2008-01-08 2009-07-23 Yamatake Corp Fuel supply device
CN101498457A (en) * 2009-03-02 2009-08-05 杭州电子科技大学 Boiler combustion optimizing method
CN102734833A (en) * 2012-06-07 2012-10-17 中国神华能源股份有限公司 Boiler optimization method for reducing nitrogen oxide discharge
CN103225819A (en) * 2013-04-24 2013-07-31 广东电网公司电力科学研究院 Oxygen volume adjusting method and system for pulverized coal boiler after change of coal type
CN103234219A (en) * 2013-04-24 2013-08-07 广东电网公司电力科学研究院 Circumference air quantity adjustment method and system for pulverized coal boiler after fire coal kind changing
CN103672953A (en) * 2013-12-27 2014-03-26 广东省粤电集团有限公司珠海发电厂 Self-adaptive control method and system of combustion of multiple types of coal of boiler
CN105276611A (en) * 2015-11-25 2016-01-27 广东电网有限责任公司电力科学研究院 Adjustment and optimization method and system for combustion of power plant boiler

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