CN106765281A - A kind of 900MW power boiler burning optimizations air distribution method of adjustment - Google Patents
A kind of 900MW power boiler burning optimizations air distribution method of adjustment Download PDFInfo
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- CN106765281A CN106765281A CN201611250991.4A CN201611250991A CN106765281A CN 106765281 A CN106765281 A CN 106765281A CN 201611250991 A CN201611250991 A CN 201611250991A CN 106765281 A CN106765281 A CN 106765281A
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- Prior art keywords
- load
- air distribution
- oxygen amount
- adjustment
- optimizations
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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
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
-
- 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 present invention relates to a kind of 900MW power boiler burning optimizations air distribution method of adjustment, including：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 has significantly reduces, the advantages of greatly save the energy.
Description
Technical field
The present invention relates to one kind, more particularly, to a kind of 900MW power boiler burning optimizations air distribution method of adjustment.
Background technology
From the point of view of my two boiler Actual combustion air distribution situations of company.Subject matter is as follows：
1) secondary air flow is bigger than normal
From the point of view of secondary air flow main sign bigger than normal is exactly the comparison with domestic same type units under the conditions of same load,
My the actual motion oxygen amount value of company's unit is substantially bigger than normal, that is to say, that actual motion air quantity is far above theoretical calculation air quantity.It is aobvious
So, this phenomenon is all unfavorable for the safety economy environmental protection operation of boiler.
First, from the point of view of the mechanism of boiler NOX things generation, enough air capacities are the necessary conditions for producing NOX things, and mistake
Big oxygen amount is that secondary air flow is exactly hotbed that the generation of NOX things is provided.So as to have a strong impact on the environmental protection operation of unit.
Secondly, although excessive secondary air flow is so that the burning of coal dust is more abundant, this refers to only oxygen amount one
In individual suitable scope.If beyond this scope because the increase of air quantity certainly will cause blast to be also elevated so that coal dust flow velocity
Increase, moved after the ignition point of coal dust.This plays negative interaction in fact to stabilization burning.
3rd, as previously mentioned, excessive secondary air flow can must improve coal dust flow velocity significantly.This allows for coal dust in burner hearth
Portion is shortened burning time, so that whole in-furnace temperature and flue-gas temperature reduction, so increase not only boiler efficiency
Plus, it is reduction of whole boiler efficiency on the contrary in a way, reduce the economy of boiler operatiopn.
The content of the invention
The purpose of the present invention is exactly to provide a kind of 900MW station boilers for the defect for overcoming above-mentioned prior art to exist
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 optimizations air distribution method of adjustment, it is characterised in that including：The operation of drop oxygen amount, adjustment
Secondary Air air distribution.
Described Secondary Air air distribution adjustment includes：
Burnout degree baffle opening is tested, and takes 900~450MW loads section, is a load breakpoints with 50MW, in the load point
While maintaining steady load, it is one grade with 10% and progressively turns down after-flame windshield plate, observes each additional ventilation flap of coal pulverizer
The situation of change of aperture and unit DS NOx Est amount；
Drop oxygen amount experiment, takes 900~450MW loads section, is a load breakpoints with 50MW, and load is maintained in the load point
While stabilization, with 0.1% for one grade, the biasing of boiler oxygen amount setting is reduced；After after set steady, unit parameters are observed
Situation of change；
The big bellows differential pressure Adjustment Tests of boiler, are carried out in more than unit load 700MW, are a load breakpoints with 50MW,
It is one grade with 100pa after the new oxygen amount biasing having determined is tested before being adjusted to, down-set big bellows differential pressure
Controlling value.
More than unit load 700MW, reduces oxygen amount biasing -1.5% and runs, while the big bellows differential pressure controlling value of boiler is put
800Pa, turns down burnt wind baffle opening minimum and is not less than 60%.
Below unit load 700MW, reduces oxygen amount biasing -1.2% and runs, and the big bellows differential pressure controlling value of boiler puts not do to be had
Body requirement, turns down burnt wind baffle opening minimum and is not less than 80%.
Below unit load 450MW, 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
Significantly reduce, greatly save the energy, acquired economic benefit has some idea of.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on the implementation in the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made all should
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
Experiment obtains a large amount of actual operating datas, then acquired data are analyzed compare, and finally sums up a whole set of optimization pot
Stove air distribution scheme.
Secondary Air air distribution is adjusted
The comb changed to the analysis of unit practical operation situation and the relevant parameter to that may cause before
Reason.Whole Secondary Air air distribution adjustment can be divided into several parts and perform.
2.1 burnout degree baffle openings are tested
From the point of view of current operation actual conditions, our big bellows differential pressure setting is a constant straight line, is all the time
Adjusted according to this steady state value of 1000pa.Based on this premise, we maintain this constant setting value constant first, do corresponding
Burnout degree baffle opening experiment.It is desirable that, with burnout degree baffle opening now, make one it is one-to-one with load
Curve, and a reference value tested as next step.
We take 900~450MW loads section, are a load breakpoints with 50MW, and steady load is maintained in the load point
Meanwhile, after-flame windshield plate is progressively turned down for one grade with 10%.The aperture and unit NOX of each additional ventilation flap of coal pulverizer of observation
The situation of change of discharge capacity.
2.2 drop oxygen amount experiments
The burnout degree baffle opening experiment before, we have obtained a combustion for being more suitable for our actual operating modes
The curve of most windshield plate aperture, this curve is corresponded with load.In next drop oxygen amount experiment, all load section after-flames
The aperture of windshield plate, the test data of gained was configured in the experiment of burnout degree baffle opening before.
900~450MW loads section is taken, is a load breakpoints with 50MW, while the load point maintains steady load,
With 0.1% for one grade, the biasing of boiler oxygen amount setting is reduced.After 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 all the time according to this steady state value of 1000pa
To adjust.Only work as unit load>During 750MW, in the case of after-flame windshield plate standard-sized sheet, big bellows differential pressure can just be more than
1000pa this steady state value.And the aperture that after-flame windshield plate was turned down before us can be so that this load point be moved down, it may be possible to
730MW is lower.But we now reduce the setting value of oxygen amount, the effect for liquidating will be played to this partial action.Now,
By this series of adjustment, what we obtained is a big bellows differential pressure for new corresponding different load.
Again because having inseparable relation between the big bellows differential pressure of drop and drop oxygen amount, before we have references to
Drop oxygen amount testing program, has formulated the testing program as declined strong wind case differential pressure：
1) test before, require first thermal technology drop the big bellows differential pressure of boiler adjustment module accomplish control DCS in；
2) experiment mainly carried out in more than unit load 700MW, be a load breakpoints with 50MW, be adjusted to us it
It is one grade with 100pa after the new oxygen amount biasing that preceding experiment has determined, the controlling value of down-set big bellows differential pressure.
2.4 test datas collect
3 experiments more than, we have obtained a large amount of basic datas on the basis of unit load, and following table is that unit exists
During different load operating mode, the data list for obtaining,：
900MW
850MW
800MW
750MW
700MW
650MW
600MW
550MW
500MW
450MW
According to the project implementation process as implied above, the up to all kinds of experiments of 30 times or so are carried out, obtained substantial amounts of
Basic data.By the analyses and comparison to these data, we are readjusted to whole boiler combustion with subsystem, right
The setting of the key parameter involved by whole blowing system has carried out specification again, and the measure of specific implementation is as follows：
More than unit load 700MW, reduces oxygen amount biasing -1.5% and runs, while the big bellows differential pressure controlling value of boiler is put
800Pa, suitably turns down burnt wind baffle opening minimum and is not less than 60%；
Below unit load 700MW, reduces oxygen amount biasing -1.2% and runs, and the big bellows differential pressure controlling value of boiler puts not do to be had
Body requirement, suitably turns down burnt wind baffle opening minimum and is not less than 80%.
Below unit load 450MW, oxygen amount does appropriate reduction, range of operation -0.8~-1.2%.
During variable load operation, if there is " wind-coal intersects limitation ", in order to be sufficiently accurate it may be desired to which 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, puts into again again after unit is stable；
When unit meets other misoperation operating modes, oxygen amount, big bellows differential pressure, burnt wind can be recovered according to disposition at that time
The controlling value of baffle plate etc., after being 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 the Ming Hua companies to carry out《#5 stoves optimizing operating mode adjusts contrast test》, test number
According to display：During 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 consumes the 544.46 yuan/ton of calculating of unit price of mark coal within 2015, saves nearly 7,600,000 yuan of fuel cost.
During unit load 650MW, net coal consumption rate declines 1.24g/KWH, annual amount of energy saving：
1.24g/KWH × 7,700,000,000=9548 ≈ 10000T
Company consumes the 544.46 yuan/ton of calculating of unit price of mark coal within 2015, saves nearly 5,400,000 yuan of fuel cost.
Test report also shows, the DS NOx Est value of boiler export have dropped 100mg/Nm3 before implementing compared with scheme, thus I
Again can obtain another 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 loads, the NOX in flue gas is taken off 90mg/Nm3 by denitrification apparatus by 450mg/Nm3
Need to use 680kg urea per hour；
66.56%：Company Annual rate of load condensate in 2015；
4345.35h：Company Annual unit utilizes hourage within 2015；
(450-90)mg/Nm3：Denitrification apparatus designed capacity is that the NOX in flue gas is taken off to 90 by 450.
5.4631 × 100=546.32 ≈ 550T
550 × 2200=1210000 units
Be can be calculated more than, boiler export NOX declines 100mg/Nm3, annual urea expenditure will save 1,200,000
Unit.
By gross coal consumption rate and urea expenditure, the two is added, by the project yield of our reality of the Comparability test of Ming Hua companies
At 9,000,000 yuan or so.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or replacement should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain be defined.
Claims (5)
1. a kind of 900MW power boiler burning optimizations air distribution method of adjustment, it is characterised in that including：The operation of drop oxygen amount, adjustment two
Secondary wind air distribution.
2. a kind of 900MW power boiler burning optimizations air distribution method of adjustment according to claim 1, it is characterised in that institute
The Secondary Air air distribution adjustment stated includes：
Burnout degree baffle opening is tested, and takes 900~450MW loads section, is a load breakpoints with 50MW, is maintained in the load point
While steady load, after-flame windshield plate is progressively turned down for one grade with 10%, observe each aperture of the additional ventilation flap of coal pulverizer
And the situation of change of unit DS NOx Est amount；
Drop oxygen amount experiment, takes 900~450MW loads section, is a load breakpoints with 50MW, and steady load is maintained in the load point
While, with 0.1% for one grade, reduce the biasing of boiler oxygen amount setting；After after set steady, the change of unit parameters is observed
Change situation；
The big bellows differential pressure Adjustment Tests of boiler, are carried out in more than unit load 700MW, are a load breakpoints with 50MW, are being adjusted
Whole is one grade with 100pa to after testing the new oxygen amount biasing that has determined before, the control of down-set big bellows differential pressure
Value.
3. a kind of 900MW power boiler burning optimizations air distribution method of adjustment according to claim 2, it is characterised in that machine
Group more than load 700MW, reduces oxygen amount biasing -1.5% and runs, while the big bellows differential pressure controlling value of boiler puts 800Pa, turns down combustion
Cinder windshield plate aperture minimum is not less than 60%.
4. a kind of 900MW power boiler burning optimizations air distribution method of adjustment according to claim 2, it is characterised in that machine
Group below load 700MW, reduces oxygen amount biasing -1.2% and runs, and the big bellows differential pressure controlling value of boiler is put and do not do specific requirement, is closed
Small burnt wind baffle opening minimum is not less than 80%.
5. a kind of 900MW power boiler burning optimizations air distribution method of adjustment according to claim 2, it is characterised in that machine
Group below load 450MW, oxygen amount reduction, range of operation -0.8~1.2%.
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| 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 |
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2016
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Patent Citations (8)
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| 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 |
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| 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 |
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