CN107143873A - Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical - Google Patents
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical Download PDFInfo
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- CN107143873A CN107143873A CN201710317438.6A CN201710317438A CN107143873A CN 107143873 A CN107143873 A CN 107143873A CN 201710317438 A CN201710317438 A CN 201710317438A CN 107143873 A CN107143873 A CN 107143873A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
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Abstract
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical provided in an embodiment of the present invention, including：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h according to oxygen amount leveling, burner, burnout degree standard-sized sheet according to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOx discharge；Operation oxygen amount, unburned carbon in flue dust and the NOx discharge data obtained according to detection adjust upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees baffle plate on the spot.Adjustment of embodiment of the present invention burnout degree is on the spot after baffle plate, both sides oxygen amount slightly has raising, furnace width distribution is uniform compared with before leveling, CO in boiler emission flue gas declines to a great extent, a kind of feasible technological means is provided for opposed firing boiler burning optimization adjustment before and after thermal power plant's ultra supercritical, with highly important engineering application value.
Description
Technical field
The present invention relates to right before and after surface fine structure processing, nanometer technique field, more particularly to a kind of ultra supercritical
Rush boiler nitrogen oxide burning and optimize and revise method.
Background technology
Since 21 century, with developing rapidly for industry, the development of thermal power generation is also increasingly swift and violent, while thermal power generation is made
For with can rich and influential family, it is energy-saving most important for China's industrial circle.Therefore, low cost, efficient Large Copacity high parameter
Boiler turns into the trend that thermal power generation develops.Existing energy consumption and low nitrogen burning on 600MW super critical boilers transforms research,
The low nitrogen modification scheme carried out using numerical simulation to boiler carries out excellent；By taking 660MW extra-supercritical units as an example, pass through combustion
Adjustment and SCR combustion adjustments are burnt, influence of the operational factor to the escaping of ammonia rate is have studied；By taking 660MW extra-supercritical units as an example, point
Analyse influence of the operational factor to boiler efficiency；Based on boiler of power plant transform experimental study document include to 600MW units pair
Rush the transformation of burning boiler low nitrogen burning and combustion adjustment is studied.By changing burner, reasonable Arrangement burnout degree nozzle,
The effect of reduction NOx emission is reached.Document is analyzed the effect that low nitrogen is transformed respectively, and the NOx emission concentration range of decrease is bright
Aobvious, low nitrogen correctional effect is notable.
Certain boiler limited company of the Guangdong power plant 660MW ultra-supercritical boilers unit country manufactures and designs
660MW ultra supercritical coal-burning boilers, boiler puts into operation for 2011.There is DS NOx Est to solve boiler caused by long-play
Flying marking and CO concentration of emissions in higher, side wall high temperature corrosion, burner region coking and partial combustion burner abrasion etc., flue gas
It is higher.The problems such as carried out boiler-burner and burning air quantity transformation, while carried out air quantity adjustment after transformation, oxygen amount adjustment
Diagnostic test, to verify the accuracy of transformation.
Therefore opposed firing boiler nitrogen oxide burning optimizes and revises method before and after the present invention proposes a kind of ultra supercritical, so as to be
The adjustment of opposed firing boiler burning optimization provides a kind of feasible technological means before and after thermal power plant's ultra supercritical, with highly important
Engineering application value.
The content of the invention
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after the present invention proposes a kind of ultra supercritical, so as to be thermoelectricity
The adjustment of opposed firing boiler burning optimization provides a kind of feasible technological means before and after factory's ultra supercritical, with highly important engineering
Application value.
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical provided in an embodiment of the present invention, bag
Include：
S1：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h, burner, burnout degree standard-sized sheet, root according to oxygen amount leveling
According to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOxDischarge capacity；
S2：Operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity data adjust upper strata OFA direct current wind
Deflection angle and lower floor's OFA burnout degrees baffle plate on the spot.
Preferably, the step S2 is specifically included：
Obtain operation oxygen amount, unburned carbon in flue dust and NO that detection is obtainedxDischarge capacity data；
Compare the size between the middle oxygen amount and both walls oxygen amount in operation oxygen amount data by calculating, if operation oxygen amount
Middle oxygen amount in data is more than the both walls oxygen amount in operation oxygen amount data, then performs next step；
Upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees are adjusted according to default burnout degree throttle opening data value
Baffle plate on the spot.
Preferably, baffle plate includes the lower floor OFA burnout degrees on the spot：Lower floor OFA burnout degrees Whirl deposite tank baffle plate, lower floor on the spot
OFA burnout degree direct currents wind baffle plate on the spot.
Preferably, also include after the step S2：
S3：Big instruction is opened according to upper strata burnout degree wind-box damper to rise to the aperture regulation of upper strata burnout degree wind-box damper
100%.
Preferably, also include after the step S2：
S4：According to lower floor's burnout degree wind-box damper regulating command by the aperture regulation of lower floor's burnout degree wind-box damper extremely
100%.
Preferably, also include after the step S2：
S5：According to outer second air damper open big instruction by the outer second air damper regulation of burner open it is big to
75%.
Preferably, also include after the step S2：
S6：Instructed according to oxygen content control by denitration import oxygen flow regulation to 3.1%.
Preferably, also include after the step S2：
S7：Coal pulverizer separation gear is adjusted according to coal pulverizer regulating command and coal pulverizer differential pressure limitation range parameter from small to large
Plate aperture, while detecting fineness of pulverized coal, when it is 43% to detect coal dust, fixed coal pulverizer skimming baffle aperture simultaneously completes to adjust
Section.
Opposed firing boiler nitrogen oxide burning optimizes and revises device before and after a kind of ultra supercritical provided in an embodiment of the present invention, bag
Include：
Oxygen amount leveling and detection module, the total blast volume that opposed firing boiler is adjusted for being instructed according to oxygen amount leveling is 2300t/h,
Burner, burnout degree standard-sized sheet, according to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, flying marking
Amount and NOxDischarge capacity；
Deflection angle and baffle plate adjustment module, for operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity
Data adjust upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees baffle plate on the spot.
Preferably, the deflection angle and baffle plate adjustment module are specifically included：
Data detecting unit, for obtaining operation oxygen amount, unburned carbon in flue dust and NO that detection is obtainedxDischarge capacity data；
Oxygen amount comparing unit, for being compared by calculating between the middle oxygen amount and both walls oxygen amount run in oxygen amount data
Size, if operation oxygen amount data in middle oxygen amount be more than run oxygen amount data in both walls oxygen amount, perform deflection angle
And baffle plate adjustment unit；
Deflection angle and baffle plate adjustment unit are straight for adjusting upper strata OFA according to default burnout degree throttle opening data value
Flow windage yaw corner and lower floor's OFA burnout degrees baffle plate on the spot.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical provided in an embodiment of the present invention, bag
Include：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h, burner, burnout degree standard-sized sheet, according to default according to oxygen amount leveling
Throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOx discharge；Obtained according to detection
Run oxygen amount, unburned carbon in flue dust and NOx discharge data regulation upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees on the spot
Baffle plate.Adjustment of embodiment of the present invention burnout degree is on the spot after baffle plate, and both sides oxygen amount slightly has raising, and furnace width distribution is equal compared with before leveling
Even, the CO in boiler emission flue gas declines to a great extent, and is provided for opposed firing boiler burning optimization adjustment before and after thermal power plant's ultra supercritical
A kind of feasible technological means, with highly important engineering application value.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 a are that the embodiment of the present invention is used to illustrate power plant's burnout degree deployment scenarios before transformation；
Fig. 1 b are that the embodiment of the present invention is used to illustrate improved power plant's burnout degree deployment scenarios；
Fig. 2 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
The schematic diagram of one embodiment of method；
Fig. 3 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
Furnace chamber width oxygen amount distribution map in the application examples of method；
Fig. 4 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
The schematic diagram of another embodiment of method；
Fig. 5 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
The schematic diagram of another embodiment of method；
Fig. 6 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
Change the graph of a relation of upper strata burnout degree wind-box damper aperture in the application examples of method；
Fig. 7 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
Change the graph of a relation of Secondary Air damper in the application examples of method；
Fig. 8 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
The graph of a relation that NOX changes with oxygen amount in the application examples of method；
Fig. 9 is the opposed firing boiler nitrogen oxide burning side of optimizing and revising before and after a kind of ultra supercritical provided in an embodiment of the present invention
The graph of a relation that boiler efficiency changes with oxygen amount in the application examples of method；
Figure 10 optimizes and revises for opposed firing boiler nitrogen oxide burning before and after a kind of ultra supercritical provided in an embodiment of the present invention
Change the graph of a relation of fineness of pulverized coal in the application examples of method.
Embodiment
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after the present invention proposes a kind of ultra supercritical, so as to be thermoelectricity
The adjustment of opposed firing boiler burning optimization provides a kind of feasible technological means before and after factory's ultra supercritical, with highly important engineering
Application value.
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
First, the field of the embodiment of the present invention is illustrated：
Modern power plant design uses first generation OPCC vortex burners, and front-back wall arrangement organizes opposed firing.This
Secondary burner reconstruction uses newest low NOX turbulent burner technology, mainly by First air elbow, primary air piping, inner second air dress
Put, outer second air device (contains air register, governor motion), pulverized coal concentrator, flame stabilization ring, the parts such as reamer, burner shell
Air register in original burner is changed to orient Whirl deposite tank knot using the additional periphery of center direct current wind by composition, transformation afterburner
Structure, makes uncombusted carbon and flue gas, in burner hearth center, prevent burner coking and high temperature corrosion by eddy flow solar or lunar halo.
Existing power plant can typically transform for burnout degree, in order to strengthen the deep combustion in boiler height direction, reach
To reduction NOXPurpose, newly increased on the burnout degree upper strata designed originally one layer with former cloth put burnout degree identical direct current after-flame
Wind (front/rear each 6 burners of wall)；While in order to further reduce NOXDischarge capacity, redesigns and increases after-flame air quantity,
After-flame air quantity is reached boiler air quantity 19% or so, burnout degree distribution such as Fig. 1 a (before transformation) and Fig. 1 b before and after transformation (after transformation)
It is shown.But, the field for carrying out improved power plant is only a kind of application scenarios in the present embodiment, the power plant before transformation
The method that field can also be provided by the present invention is applied, and is also a kind of application scenarios of the embodiment of the present invention.
Referring to Fig. 2, opposed firing boiler nitrogen oxide burning optimizes before and after a kind of ultra supercritical provided in an embodiment of the present invention
One embodiment of method of adjustment, including：
S1：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h, burner, burnout degree standard-sized sheet, root according to oxygen amount leveling
According to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOxDischarge capacity；
S2：Operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity data adjust upper strata OFA direct current wind
Deflection angle and lower floor's OFA burnout degrees baffle plate on the spot.
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical provided in an embodiment of the present invention, bag
Include：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h, burner, burnout degree standard-sized sheet, according to default according to oxygen amount leveling
Throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOx discharge；Obtained according to detection
Run oxygen amount, unburned carbon in flue dust and NOx discharge data regulation upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees on the spot
Baffle plate.Adjustment of embodiment of the present invention burnout degree is on the spot after baffle plate, and both sides oxygen amount slightly has raising, and furnace width distribution is equal compared with before leveling
Even, the CO in boiler emission flue gas declines to a great extent, and is provided for opposed firing boiler burning optimization adjustment before and after thermal power plant's ultra supercritical
A kind of feasible technological means, with highly important engineering application value.
Optimized according to opposed firing boiler nitrogen oxide burning before and after a kind of above-mentioned ultra supercritical provided in an embodiment of the present invention
One embodiment of method of adjustment is applied, and obtains application examples as follows：
Holding total blast volume is 2300t/h, burner, burnout degree standard-sized sheet, adjustment layer throttle opening such as table 1, test run oxygen
Amount, unburned carbon in flue dust and NOXDischarge capacity.
Table 1
8 smoke samplings mouthful are chosen in denitration porch, are tested, smoke components such as table is analyzed using flue gas analyzer
2。
Table 2
As shown in Table 2 in boiler running process, oxygen amount height, both walls oxygen amount in the middle of flake hearth-tapping is presented in the wide oxygen amount distribution of stove
Low rule, while CO discharge capacitys are higher.In order to be lifted close to both walls flue gas oxygen content, make overall oxygen amount distribution more equal
Weighing apparatus, reduces CO.The baffle plate on the spot such as Whirl deposite tank and direct current wind of upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees is adjusted, is adjusted
Whole rear burnout degree throttle opening such as table 3.
Table 3
8 smoke samplings mouthful are chosen in denitration porch after regulating fender, oxygen amount test is carried out, surveyed from boiler furnace outlet
Measure in smoke components and Fig. 3 as can be seen that adjustment burnout degree is on the spot after baffle plate, both sides oxygen amount slightly has raisings, and furnace width is distributed
Compared with, uniformly because adjusting after aperture and deflection angle, remnants are reversed in mitigation OFA direct currents wind and the outlet of OFA burnout degrees wind before leveling
And NO can be reducedXDischarge capacity；CO in boiler emission flue gas is declined to a great extent, and 225ppm is dropped to from 535ppm.Although entirety CO
It is not high but of a relatively high in the relatively low burner hearth both sides CO contents of oxygen amount.
Opposed firing boiler nitrogen oxide burning optimization before and after a kind of ultra supercritical provided in an embodiment of the present invention will be adjusted below
Another embodiment of adjusting method is described in detail.
Referring to Fig. 4, opposed firing boiler nitrogen oxide burning optimizes before and after a kind of ultra supercritical provided in an embodiment of the present invention
Another embodiment of method of adjustment, including：
201：Instructed according to oxygen amount leveling and adjust the total blast volume of opposed firing boiler for 2300t/h, burner, burnout degree standard-sized sheet,
According to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOxDischarge capacity；
202：Obtain operation oxygen amount, unburned carbon in flue dust and NO that detection is obtainedxDischarge capacity data；
203：Compare the size between the middle oxygen amount and both walls oxygen amount in operation oxygen amount data by calculating, if operation
Middle oxygen amount in oxygen amount data is more than the both walls oxygen amount in operation oxygen amount data, then performs next step；
204：Upper strata OFA direct current windage yaw corners and lower floor OFA combustions are adjusted according to default burnout degree throttle opening data value
Use up wind baffle plate on the spot.
Baffle plate includes lower floor's OFA burnout degrees on the spot：Baffle plate, lower floor's OFA burnout degrees are straight on the spot for lower floor OFA burnout degrees Whirl deposite tank
Flow wind baffle plate on the spot.
Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical provided in an embodiment of the present invention, bag
Include：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h, burner, burnout degree standard-sized sheet, according to default according to oxygen amount leveling
Throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOx discharge；Obtained according to detection
Run oxygen amount, unburned carbon in flue dust and NOx discharge data regulation upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees on the spot
Baffle plate.Adjustment of embodiment of the present invention burnout degree is on the spot after baffle plate, and both sides oxygen amount slightly has raising, and furnace width distribution is equal compared with before leveling
Even, the CO in boiler emission flue gas declines to a great extent, and is provided for opposed firing boiler burning optimization adjustment before and after thermal power plant's ultra supercritical
A kind of feasible technological means, with highly important engineering application value.
Opposed firing boiler nitrogen oxide burning optimization before and after a kind of ultra supercritical provided in an embodiment of the present invention will be adjusted below
Another embodiment of adjusting method is described in detail.
Referring to Fig. 5, opposed firing boiler nitrogen oxide burning optimizes before and after a kind of ultra supercritical provided in an embodiment of the present invention
Another embodiment of method of adjustment, including：
301：Instructed according to oxygen amount leveling and adjust the total blast volume of opposed firing boiler for 2300t/h, burner, burnout degree standard-sized sheet,
According to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOxDischarge capacity；
302：Operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity data adjust upper strata OFA direct current wind
Deflection angle and lower floor's OFA burnout degrees baffle plate on the spot.
303：Big instruction is opened according to upper strata burnout degree wind-box damper to rise the aperture regulation of upper strata burnout degree wind-box damper
To 100%.
304：According to lower floor's burnout degree wind-box damper regulating command by the aperture regulation of lower floor's burnout degree wind-box damper extremely
100%.
305：According to outer second air damper open big instruction by the outer second air damper regulation of burner open it is big to
75%.
306：Instructed according to oxygen content control by denitration import oxygen flow regulation to 3.1%.
307：Coal pulverizer separation is adjusted according to coal pulverizer regulating command and coal pulverizer differential pressure limitation range parameter from small to large
Baffle opening, while detecting fineness of pulverized coal, when it is 43% to detect coal dust, fixed coal pulverizer skimming baffle aperture simultaneously completes to adjust
Section.
Opposed firing boiler nitrogen oxide burning optimization before and after a kind of ultra supercritical provided in an embodiment of the present invention will be adjusted below
Another application examples of adjusting method is illustrated：
Apply behind step 301~307, under being applied for example：
(applying step 303) is after by oxygen amount leveling with carrying out variable air rate (upper strata burnout degree) to unit under 660MW loads
Analysis experiment.Upper strata burnout degree wind-box damper is gradually increased to 100% from 30%, test boiler furnace outlet smoke components and fly
Grey result of laboratory test such as Fig. 6.
As seen from Figure 6, upper strata burnout degree wind-box damper open it is big after, DS NOx Est from 259.3mg/Nm3 fall after rising to
240.7mg/Nm3, because increase burnout degree causes the reduction of primary zone oxygen concentration, reproducibility atmosphere strengthen other primary zone temperature because
Burnout degree is set up also to have reduced.But total range of decrease is less, because upper strata after-flame air quantity amplification is little.Upper strata burnout degree bellows
After baffle opening increase, CO contents and unburned carbon in flue dust have declined.Because after upper strata burnout degree is opened greatly, upper strata burnout degree
Bellows blast is bigger, to overcoming upper strata burnout degree stronger due to installing the resistance error ability that difference is produced, so oxygen amount is more
Uniformly.In addition, CO declines are also slightly higher relevant with process of the test oxygen amount.
Under 660MW loads, lower floor's burnout degree baffle opening is adjusted to 30% from 100%, remaining parameter constant.Observation
Influence of lower floor's burnout degree wind-box damper aperture to NOX and flying dust.
Lower floor's burnout degree wind-box damper is closed to 50% from 100%, is closed from 50% to 30%, analysis boiler furnace outlet measurement
After smoke components and flying dust result of laboratory test find that lower floor's burnout degree wind-box damper is turned down, DS NOx Est has risen, from 260mg/
Nm3 is given birth to 280mg/Nm3 or so.After lower floor's burnout degree wind-box damper aperture is reduced, CO rises, and unburned carbon in flue dust rises.This is
Because after lower floor's burnout degree is turned down, lower floor's burnout degree bellows blast diminishes so that the effect of differentiation air distribution is bad.In addition, combustion
After air quantity declines to the greatest extent, burnout degree is penetrated to be deteriorated with mixed, also results in CO risings.
Carry out variable air rate (outer second air) analysis experiment under 660MW loads, the outer second air damper of burner from
30 ° are opened to after 75 °, measure boiler furnace outlet measurement smoke components and flying dust result of laboratory test such as Fig. 7.Burner outer second air wind
After Men Kai great, NOX declines, and drops to 232.1mg/Nm3 from 273.8mg/Nm3, burner outer second air swirl strength, which weakens, to be had
Beneficial to control NOX discharge [16,17].After the increase of burner outer second air damper aperture, CO changes of contents is little, flying dust
Phosphorus content is reduced, and carbon after-flame is conducive to mainly due to higher secondary air flow.
From experiment before as can be seen that influence of the oxygen amount to burning is non-negligible.Therefore, to machine under 660MW loads
Group carries out the experiment of change oxygen amount (denitration entrance oxygen amount) economic analysis.It is 2.1%, 2.5%, 3.1%, 3.7% to control oxygen amount,
4.0%, 4.4%.Obtained boiler efficiency and DS NOx Est amount is as shown in Figure 8, Figure 9.
It can be seen from Fig. 8 and Fig. 9 before oxygen amount rises to 3.1%, boiler efficiency is persistently raised, but more than 3.1%
Afterwards, boiler efficiency claims downward trend, and whole process boiler efficiency is fallen after rising.With the reduction of oxygen amount, boiler efficiency first rises
After drop, be primarily due to the reduction with oxygen amount, uncombusted carbon content increase, heat loss due to incomplete combustion's increase, and discharging fume
Heat loss is also reduced simultaneously.But, the amplitude of flue gas loss reduction is much larger than the amplitude that heat loss due to incomplete combustion increases, boiler
Efficiency is integrally in rising trend.Reduced with the continuation of oxygen amount, the amplitude of heat loss due to incomplete combustion's increase is more than exhaust gas heat loss
The amplitude of reduction is lost, boiler efficiency is on a declining curve.With the gradually reduction of operation oxygen amount, DS NOx Est is gradually reduced, mainly
Because oxygen amount is reduced the growing amount of main burner region heating power type and burning type NOX is substantially reduced.It is 3.1% in oxygen amount
When, boiler efficiency highest and DS NOx Est amount under 660MW loads, keep denitration import oxygen amount 3.1% close to minimum
It can ensure that boiler operatiopn state is optimal.
Coal dust analysis is carried out to unit under 660MW loads to test, coal pulverizer is adjusted in the range of the limitation of coal pulverizer differential pressure
Separator aperture.Remaining parameter constant, changes coal pulverizer skimming baffle aperture to adjust fineness of pulverized coal, measures fineness of pulverized coal pair
NOXAnd the influence of flying dust such as Figure 10.As seen from Figure 10, with fineness of pulverized coal increase heat loss of imperfect solid combustion gradually
Increase, boiler efficiency drops to 91.4% by 93.1%.Because the increase of fineness of pulverized coal, the coal powder ignition difficulty made increases
Plus, in the case where coal dust residing time in furnace is constant, coal dust after-flame degree is low, causes boiler loss to raise, boiler efficiency drop
It is low while as coal dust is thicker, burning remitted its fury, NO in boilerXDischarge is decreased, and 245mg/ is dropped to from 296mg/Nm3
Nm3Left and right.
Opposed firing boiler nitrogen oxide burning optimization before and after a kind of ultra supercritical provided in an embodiment of the present invention will be adjusted below
One embodiment of engagement positions is described in detail.
Opposed firing boiler nitrogen oxide burning optimizes and revises device before and after a kind of ultra supercritical provided in an embodiment of the present invention
One embodiment, including：
Oxygen amount leveling and detection module, the total blast volume that opposed firing boiler is adjusted for being instructed according to oxygen amount leveling is 2300t/h,
Burner, burnout degree standard-sized sheet, according to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, flying marking
Amount and NOxDischarge capacity；
Deflection angle and baffle plate adjustment module, for operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity
Data adjust upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees baffle plate on the spot.
Deflection angle and baffle plate adjustment module are specifically included：
Data detecting unit, for obtaining operation oxygen amount, unburned carbon in flue dust and NO that detection is obtainedxDischarge capacity data；
Oxygen amount comparing unit, for being compared by calculating between the middle oxygen amount and both walls oxygen amount run in oxygen amount data
Size, if operation oxygen amount data in middle oxygen amount be more than run oxygen amount data in both walls oxygen amount, perform deflection angle
And baffle plate adjustment unit；
Deflection angle and baffle plate adjustment unit are straight for adjusting upper strata OFA according to default burnout degree throttle opening data value
Flow windage yaw corner and lower floor's OFA burnout degrees baffle plate on the spot.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical, it is characterised in that including：
S1：The total blast volume of regulation opposed firing boiler is instructed to be 2300t/h, burner, burnout degree standard-sized sheet, according to pre- according to oxygen amount leveling
If throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and NOxDischarge capacity；
S2：Operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity data adjust upper strata OFA direct current windage yaw corners
And lower floor's OFA burnout degrees baffle plate on the spot.
2. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, the step S2 is specifically included：
Obtain operation oxygen amount, unburned carbon in flue dust and NO that detection is obtainedxDischarge capacity data；
Compare the size between the middle oxygen amount and both walls oxygen amount in operation oxygen amount data by calculating, if operation oxygen amount data
In middle oxygen amount be more than operation oxygen amount data in both walls oxygen amount, then perform next step；
Upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees are adjusted on the spot according to default burnout degree throttle opening data value
Baffle plate.
3. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, baffle plate includes the lower floor OFA burnout degrees on the spot：Baffle plate, the lower floor OFA combustions on the spot of lower floor OFA burnout degrees Whirl deposite tank
Use up wind direct current wind baffle plate on the spot.
4. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, also includes after the step S2：
S3：Big instruction is opened according to upper strata burnout degree wind-box damper to rise to the aperture regulation of upper strata burnout degree wind-box damper
100%.
5. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, also includes after the step S2：
S4：According to lower floor's burnout degree wind-box damper regulating command by the aperture regulation of lower floor's burnout degree wind-box damper to 100%.
6. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, also includes after the step S2：
S5：Big instruction is opened according to outer second air damper to open the outer second air damper regulation of burner greatly to 75%.
7. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, also includes after the step S2：
S6：Instructed according to oxygen content control by denitration import oxygen flow regulation to 3.1%.
8. opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical according to claim 1, its
It is characterised by, also includes after the step S2：
S7：Coal pulverizer skimming baffle is adjusted from small to large and is opened according to coal pulverizer regulating command and coal pulverizer differential pressure limitation range parameter
Degree, while detecting fineness of pulverized coal, when it is 43% to detect coal dust, fixed coal pulverizer skimming baffle aperture simultaneously completes regulation.
9. opposed firing boiler nitrogen oxide burning optimizes and revises device before and after a kind of ultra supercritical, it is characterised in that including：
Oxygen amount leveling and detection module, the total blast volume that opposed firing boiler is adjusted for being instructed according to oxygen amount leveling are 2300t/h, burning
Device, burnout degree standard-sized sheet, according to default throttle opening table adjustment layer throttle opening, and detect operation oxygen amount, unburned carbon in flue dust and
NOxDischarge capacity；
Deflection angle and baffle plate adjustment module, for operation oxygen amount, unburned carbon in flue dust and the NO obtained according to detectionxDischarge capacity data
Adjust upper strata OFA direct current windage yaw corners and lower floor's OFA burnout degrees baffle plate on the spot.
10. opposed firing boiler nitrogen oxide burning optimizes and revises device before and after a kind of ultra supercritical according to claim 9, its
It is characterised by, the deflection angle and baffle plate adjustment module are specifically included：
Data detecting unit, for obtaining operation oxygen amount, unburned carbon in flue dust and NO that detection is obtainedxDischarge capacity data；
Oxygen amount comparing unit, for comparing big between the middle oxygen amount and both walls oxygen amount run in oxygen amount data by calculating
It is small, if the middle oxygen amount in operation oxygen amount data is more than the both walls oxygen amount in operation oxygen amount data, perform deflection angle and gear
Plate adjustment unit；
Deflection angle and baffle plate adjustment unit, for adjusting upper strata OFA direct current wind according to default burnout degree throttle opening data value
Deflection angle and lower floor's OFA burnout degrees baffle plate on the spot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317438.6A CN107143873A (en) | 2017-05-08 | 2017-05-08 | Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317438.6A CN107143873A (en) | 2017-05-08 | 2017-05-08 | Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical |
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| CN107143873A true CN107143873A (en) | 2017-09-08 |
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| CN201710317438.6A Pending CN107143873A (en) | 2017-05-08 | 2017-05-08 | Opposed firing boiler nitrogen oxide burning optimizes and revises method before and after a kind of ultra supercritical |
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| CN (1) | CN107143873A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957079A (en) * | 2017-11-03 | 2018-04-24 | 中国神华能源股份有限公司 | The control method of corner tangential firing pulverized-coal fired boiler |
| CN111365732A (en) * | 2020-02-28 | 2020-07-03 | 广东电科院能源技术有限责任公司 | Hedging boiler over-fire air self-adaptive control method, system and equipment |
| CN111520739A (en) * | 2020-04-29 | 2020-08-11 | 浙江浙能兰溪发电有限责任公司 | Method, device and system for adjusting carbon monoxide in flue gas of coal-fired boiler |
-
2017
- 2017-05-08 CN CN201710317438.6A patent/CN107143873A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 高建强等: ""660 MW机组超超临界锅炉运行中NOX调整试验分析"", 《浙江电力》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957079A (en) * | 2017-11-03 | 2018-04-24 | 中国神华能源股份有限公司 | The control method of corner tangential firing pulverized-coal fired boiler |
| CN107957079B (en) * | 2017-11-03 | 2019-10-15 | 中国神华能源股份有限公司 | The control method of corner tangential firing pulverized-coal fired boiler |
| CN111365732A (en) * | 2020-02-28 | 2020-07-03 | 广东电科院能源技术有限责任公司 | Hedging boiler over-fire air self-adaptive control method, system and equipment |
| CN111365732B (en) * | 2020-02-28 | 2021-09-14 | 南方电网电力科技股份有限公司 | Hedging boiler over-fire air self-adaptive control method, system and equipment |
| CN111520739A (en) * | 2020-04-29 | 2020-08-11 | 浙江浙能兰溪发电有限责任公司 | Method, device and system for adjusting carbon monoxide in flue gas of coal-fired boiler |
| CN111520739B (en) * | 2020-04-29 | 2022-03-25 | 浙江浙能兰溪发电有限责任公司 | Method, device and system for adjusting carbon monoxide in flue gas of coal-fired boiler |
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