CN105203290B - Ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method - Google Patents
Ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method Download PDFInfo
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Abstract
The present invention relates to a kind of ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method, including step：Check the air and flue system and damper, burner of ultra supercritical anise circle of contact coal-fired power station boiler；Cold conditions leveling is carried out to the coal pipe wind speed of ultra supercritical anise circle of contact coal-fired power station boiler；Primary air flow, secondary air flow demarcation are carried out to the coal pulverizer inlet of ultra supercritical anise circle of contact coal-fired power station boiler；Burner nozzle wind speed, horizontal flue air velocity to ultra supercritical anise circle of contact coal-fired power station boiler are tested, patch wind sheltering speed is tested in stove；The cool power field rule of ultra supercritical anise circle of contact coal-fired power station boiler is obtained with reference to the result of above steps.The solution of the present invention can be tested for other fired power generating unit cool power fields of same type million and provide reference, and can obtain the cool power field rule place bad to stove internally-powered field according to experiment and be adjusted, and be laid the foundation for unit hot starting, hot start and experiment.
Description
Technical field
The present invention relates to technical field of electric power, more particularly to a kind of ultra supercritical anise circle of contact coal-fired power station boiler cold conditions
Aerodynamic field test method.
Background technology
Extra-supercritical unit, due to the raising of steam pressure and vapor (steam) temperature, thermal efficiency ratio country unit average level carries
Height nearly 10%, therefore Development of Ultra-Supercritical fired power generating unit is the main direction of development of domestic and international fired power generating unit.Some researchers profit
The numerical simulation of combustion characteristics under different load after the low nitrogen of Liao Shajiao C power plant is transformed is carried out with the softwares of ANSYS FLUENT 14.0,
The main rule that have studied burner hearth velocity field, temperature field, component field and concentration distribution of pollutants.Also some researchers couple
The double tangential boiler NO emission performances of 1000MW extra-supercritical units have carried out numerical simulation study.Mainly it have studied excess air system
The influencing characterisitic that the factor such as number, AA wind rate, burner operation mode and boiler load is discharged to NO.Other researchers etc. couple
1000MW ultra-supercritical boilers combustion characteristics has carried out numerical simulation and optimization.
However, these modes are mainly carried out by way of numerical simulation, Process In A Tangential Firing is primarily directed to.And
Larger difference be present in anistree tangential boiler and Process In A Tangential Firing cool power field test method, main cause be structure very
Complexity, it is more to be related to burner nozzle, and it is real to prepare to obtain the more complicated scene of cool power field result of the test in stove
Border measurement is relatively difficult, and at present also without the related side that field test is carried out for anistree tangential boiler cool power field
Formula.
The content of the invention
It is an object of the invention to provide a kind of ultra supercritical anise circle of contact coal-fired power station boiler cool power field experiment side
Method.
A kind of ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method, comprises the following steps：
Check the air and flue system and damper of ultra supercritical anise circle of contact coal-fired power station boiler；
Check the burner of the ultra supercritical anise circle of contact coal-fired power station boiler；
Cold conditions leveling is carried out to the coal pipe wind speed of the ultra supercritical anise circle of contact coal-fired power station boiler；
Primary air flow demarcation is carried out to the coal pulverizer inlet of the ultra supercritical anise circle of contact coal-fired power station boiler；
Secondary air flow demarcation is carried out to the secondary air box of the ultra supercritical anise circle of contact coal-fired power station boiler；
The burner nozzle wind speed of the ultra supercritical anise circle of contact coal-fired power station boiler is tested；
The horizontal flue air velocity of the ultra supercritical anise circle of contact coal-fired power station boiler is tested；
Test pasting wind sheltering speed in the stove of the ultra supercritical anise circle of contact coal-fired power station boiler；
With reference to the inspection result of the air and flue system and damper, the inspection result of the burner, the coal pipe
The leveling result of wind speed, the primary air flow calibration result of the coal pulverizer inlet, the secondary air flow demarcation knot of the secondary air box
Fruit, the test result of the burner nozzle wind speed, the interior patch wind sheltering of the test result of the horizontal flue air velocity, the stove
The test result of speed, obtain the cool power field rule of the ultra supercritical anise circle of contact coal-fired power station boiler.
According to the scheme of the invention described above, its be check ultra supercritical anise circle of contact coal-fired power station boiler air and flue system and
Damper, the burner for checking the ultra supercritical anise circle of contact coal-fired power station boiler, to the ultra supercritical anise circle of contact
The coal pipe wind speed of coal-fired power station boiler carries out cold conditions leveling, the coal-grinding to the ultra supercritical anise circle of contact coal-fired power station boiler
Machine entrance carries out primary air flow demarcation, the secondary air box to the ultra supercritical anise circle of contact coal-fired power station boiler carries out Secondary Air
Amount demarcation, the burner nozzle wind speed to the ultra supercritical anise circle of contact coal-fired power station boiler are tested, to described super
The horizontal flue air velocity of critical anistree circle of contact coal-fired power station boiler is tested, is coal-fired to the ultra supercritical anise circle of contact
Patch wind sheltering speed is tested in the stove of station boiler, with reference to the inspection result of the air and flue system and damper, the burning
The inspection result of device, the manage-style custom leveling result, the coal pulverizer enter primary air flow calibration result, the secondary air box
Secondary air flow calibration result, the test result of the burner nozzle wind speed, the test knot of the horizontal flue air velocity
The test result that patch is kept away in fruit, the stove, obtain the cool power field rule of the ultra supercritical anise circle of contact coal-fired power station boiler
Rule, because this mode is a kind of field test side carried out to ultra supercritical anise circle of contact coal-fired power station boiler cool power field
Formula, it can be tested for other fired power generating unit cool power fields of same type million and very important reference is provided, and can be according to examination
Test to obtain the cool power field rule place bad to ultra supercritical anise circle of contact coal-fired power station boiler stove internally-powered field and adjust
It is whole, laid the foundation for unit hot starting, hot start and experiment.
Brief description of the drawings
Fig. 1 is the stream of the ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method embodiment of the present invention
Journey schematic diagram；
Fig. 2 is the thorax outlet air-flow test of the ultra supercritical anise circle of contact coal-fired power station boiler in concrete application example
Result figure, wherein, (a) upper strata (b) middle level (c) lower floor；
Fig. 3 is the adherent wind flow field figure of burner hearth of the ultra supercritical anise circle of contact coal-fired power station boiler in concrete application example
(speed unit m/s)；
Fig. 4 is the adherent wind wind speed profile of front wall of the ultra supercritical anise circle of contact coal-fired power station boiler in concrete application example
Figure；
Fig. 5 is the adherent wind wind speed profile of rear wall of the ultra supercritical anise circle of contact coal-fired power station boiler in concrete application example
Figure；
Fig. 6 is the adherent wind wind speed profile of left wall of the ultra supercritical anise circle of contact coal-fired power station boiler in concrete application example
Figure；
Fig. 7 is the adherent wind wind speed profile of right wall of the ultra supercritical anise circle of contact coal-fired power station boiler in concrete application example
Figure.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that embodiment described herein is only to explain the present invention,
Do not limit protection scope of the present invention.
It is shown in Figure 1, for the ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method of the present invention
The schematic flow sheet of embodiment.As shown in figure 1, the ultra supercritical anise circle of contact coal-fired power station boiler cold conditions power in the present embodiment
Field test method comprises the following steps：
Step S101：Detect the air and flue system and damper of ultra supercritical anise circle of contact coal-fired power station boiler；
Inspection to air and flue system and damper mainly includes：Detect ultra supercritical anise circle of contact coal-fired power station boiler
Whether cigarette air channel has been cleaned out, no-sundries；Detection ultra supercritical anise circle of contact coal-fired power station boiler once, send, air inducing
Whether machine inlet and outlet baffle plate action is flexible, if instruction is correct；Detect the coal-grinding of ultra supercritical anise circle of contact coal-fired power station boiler
Whether machine correlation air door, baffle plate action are flexible, if instruction is correct；Detect the two of ultra supercritical anise circle of contact coal-fired power station boiler
Whether secondary bellows have been cleaned out, no-sundries, detect secondary air register, the centre wind of ultra supercritical anise circle of contact coal-fired power station boiler
Whether door switch is flexible, if instruction is correct；
Carrying out the condition of next process is：Cigarette air channel has been cleaned out, no-sundries；Once, send, air-introduced machine inlet and outlet gear
Plate flexible movements, instruction are correct；Coal pulverizer correlation air door, baffle plate flexible movements, instruction are correct；Secondary air box has been cleaned out,
No-sundries；Secondary air register, center air door switch are flexible, and instruction is correct；If any one condition is unsatisfactory for, first uses and accordingly arrange
Apply and be improved or adjust, for example, cigarette air channel has during debris, it is necessary to first clear up debris；
Step S102：Check the burner of the ultra supercritical anise circle of contact coal-fired power station boiler；
Checking combustor mode can be：Into in the burner hearth of the ultra supercritical anise circle of contact coal-fired power station boiler, face
It is whether correct to the burner of the ultra supercritical anise circle of contact coal-fired power station boiler, detection combustor air flow direction, if with
The design of the ultra supercritical anise circle of contact coal-fired power station boiler is consistent, and checks the installation situation of burner；Detection burning
In device whether no-sundries；Whether flexible detect the action of burner secondary air register；
Carrying out the condition of next process is：Combustor air flow is in the right direction, is consistent with design；The installation situation of burner is good
It is good；No-sundries in burner；Burner secondary air register flexible movements, if any one condition is unsatisfactory for, first uses and accordingly arrange
Apply and be improved or adjust；
Step S103：Cold conditions leveling is carried out to the coal pipe wind speed of the ultra supercritical anise circle of contact coal-fired power station boiler；
The mode of cold conditions leveling is carried out to coal pipe wind speed to be：4 coal pipes corresponding to same coal pulverizer are used
The backing tube demarcated measures, if the wind speed of the coal pipe currently measured and the average value of other 3 coal pipe wind speed
When the absolute value of deviation is more than 5%, the shrinkage cavity of each coal pipe is adjusted, wherein, can be in advance by shrinkage cavity standard-sized sheet, only in adjustment
The higher shrinkage cavity of wind speed need to be turned down；
Step S104：Primary air flow mark is carried out to the coal pulverizer inlet of the ultra supercritical anise circle of contact coal-fired power station boiler
It is fixed；
Primary air flow demarcation concrete mode can be：The measurement of two operating modes is carried out to each coal-grinding fan delivery respectively, is led to
Cross adjustment primary air fan output and change coal pulverizer cold-hot wind pitch baffle opening, provide two different works of every coal pulverizer
Condition；The actual measurement air quantity of each operating mode is calculated using backing tube meter, by the actual measurement air quantity and DCS (dcs
Distributed Control System) on show that air quantity is contrasted, the correction factor of each coal pulverizer is calculated；
Step S105：Secondary air flow mark is carried out to the secondary air box of the ultra supercritical anise circle of contact coal-fired power station boiler
It is fixed；
Specifically, the demarcation of secondary air flow adjusts secondary air box pressure by changing pressure fan movable vane aperture, with adjustment
Operating mode standard backrest pipe (backrest tube cofficients is 0.80) presses the wind speed of grid survey Secondary Air, corresponding secondary so as to calculate
Air quantity；
Step S106：The burner nozzle wind speed of the ultra supercritical anise circle of contact coal-fired power station boiler is tested；
Specifically, burner nozzle wind speed can be determined by cold model experiment principle；
Step S107：The horizontal flue air velocity of the ultra supercritical anise circle of contact coal-fired power station boiler is surveyed
Examination；
The lack of homogeneity of furnace outlet (horizontal flue) flue gas flow rate easily causes furnace outlet gas temperature deviation, causes both sides
Temperature Deviation is larger, and the safety and economic operation of unit is impacted.In addition, outlet air flow velocity is too small, level is easily caused
Flue and fouling of heating surface afterwards are serious, and the safe operation to unit also brings harm；Therefore, the ultra supercritical anise is cut
The air velocity in furnace outlet section is also tested in the cold test of circle coal-fired power station boiler, point high, medium and low three layers of measurement,
It is intended to check the uniformity and size cases of exit flow；
Step S108：Test pasting wind sheltering speed in the stove of the ultra supercritical anise circle of contact coal-fired power station boiler；
Due to the strong mixing of rotating jet, the direction of air velocity can not have significantly been judged at the adherent place of burner hearth,
It is small when big when being shown as in the test of speed, at times strong and at other times weak, or even speed is " zero ".So the adherent wind of burner hearth takes 10 seconds
The arithmetic mean of instantaneous value of interior measured value, directionless difference.According to field test situation, adherent wind corresponding to the burner of middle level is chosen
Measure；
Step S109：With reference to the inspection result of the air and flue system and damper, the inspection result of the burner, institute
State the leveling result of coal pipe wind speed, the primary air flow calibration result of the coal pulverizer inlet, the Secondary Air of the secondary air box
Measure calibration result, the test result of the burner nozzle wind speed, the test result of the horizontal flue air velocity, the stove
The test result of interior patch wind sheltering speed, obtain the cool power field rule of the ultra supercritical anise circle of contact coal-fired power station boiler；
Wherein, cool power field rule can include calibration coefficient, the mark of secondary air flow of coal pulverizer inlet primary air flow
Determine rule of each layer relative deviation of coefficient, horizontal flue air velocity etc..
Accordingly, according to the scheme of above-mentioned the present embodiment, it is the wind for checking ultra supercritical anise circle of contact coal-fired power station boiler
Cigarette system and damper, check the burner of the ultra supercritical anise circle of contact coal-fired power station boiler, to the ultra supercritical
The coal pipe wind speed of anistree circle of contact coal-fired power station boiler carries out cold conditions leveling, to the ultra supercritical anise circle of contact coal fired power plant pot
The coal pulverizer inlet of stove carries out primary air flow demarcation, the secondary air box to the ultra supercritical anise circle of contact coal-fired power station boiler is entered
The demarcation of row secondary air flow, the burner nozzle wind speed to the ultra supercritical anise circle of contact coal-fired power station boiler are tested, are right
The horizontal flue air velocity of the ultra supercritical anise circle of contact coal-fired power station boiler is tested, is anistree to the ultra supercritical
Patch wind sheltering speed is tested in the stove of circle of contact coal-fired power station boiler, with reference to the inspection result of the air and flue system and damper,
The primary air flow calibration result, described that the inspection result of the burner, the leveling result of manage-style custom, the coal pulverizer enter
The test result of the secondary air flow calibration result of secondary air box, the burner nozzle wind speed, the horizontal flue air velocity
Test result, the test result that patch is kept away in the stove, obtain the cold conditions of the ultra supercritical anise circle of contact coal-fired power station boiler
Aerodynamic field rule, because this mode is a kind of to show to ultra supercritical anise circle of contact coal-fired power station boiler cool power field
Field test method, it can be tested for other fired power generating unit cool power fields of same type million and very important reference be provided, and can
To obtain the cool power field rule ground bad to ultra supercritical anise circle of contact coal-fired power station boiler stove internally-powered field according to experiment
Side is adjusted, and is laid the foundation for unit hot starting, hot start and experiment.
The application process of the present invention is illustrated below by a specific embodiment.
In this specific embodiment, subjects are：China Resources Power (Haifeng county) Co., Ltd 2 × 1050MW unit boilers,
The boiler model HG-3100/28.25-YM4 types, are manufactured by Harbin Boiler Co., Ltd..The boiler faces to be super
Boundary's variable-pressure operation direct current cooker, using П types arrangement, single burner hearth, a resuperheat, low NOXMain burner and high-order over-fire air
Grading combustion technology, reverse double-tangential firing mode, burner hearth are riffled tube vertical ascent fin panel casing, and air expanding type opens
Dynamic system；Method of temperature control is in addition to coal/water ratio, also using modes such as flue gas distributor, burner swing, water sprays.Boiler uses
Balanced draft, outdoor arrangement, dry ash extraction, all steel framework, full overhung construction.Every boiler is equipped with 6 cold First airs of medium-speed pulverizer
Machine pressurized direct pulverizing coal system, when using design coal, 5 operations, 1 standby.In addition, every boiler is synchronously equipped with SCR
Denitrating system and low-level (stack-gas) economizer system.Boiler Main Parameter is as shown in table 1, and ature of coal data is as shown in table 2：
The boiler technology parameter of table 1
The ature of coal data of table 2
Burner is using the double fireball tangential firing modes of anise without dividing wall, full tilting burner.Burner sets six altogether
Layer primary air nozzle, three floor alopecia areata rooms, Floor 12 auxiliary air compartment, whole burner are fixedly connected with water-cooling wall, and with water-cooling wall one
Play expansion downwards.Four layers of additional burnout degree nozzle, its effect are disposed with 7.2m above away from upper strata coal dust nozzle centerline
It is to supplement the air required for fuel after burning, while realizes that fractional combustion reaches to reduce in-furnace temperature level, suppresses NOX's
Generation, after-flame wind combustor form low NO together with coal burnerXCombustion system.
Every burner is respectively equipped with three mechanical atomization formula oil guns, and totally 24 oil guns, total input heat of oil gun are full stove
Heat is inputted under 15%B-MCR operating modes, for ignition of the boiler and low-load combustion-stabilizing, every oil gun is provided with high energy ignition unit.
The igniting of this engineering is intended using small oil gun tiny-oil ignition, and combustion-supporting oil uses No. 0 light diesel fuel.Oil storage tank is designed by 2 190m3, fuel feeding
Pump using the capacity of 1 × 50%+2 × 25% centrifugal pump.
Burner is using the double fireball tangential firing modes of anise without dividing wall, full tilting burner.Burner sets six altogether
Layer primary air nozzle, three floor alopecia areata rooms, Floor 12 auxiliary air compartment, it is followed successively by from top to bottom：A coal dusts, AB light oil, B coal dusts, C coal dusts,
CD light oil, D coal dusts, E coal dusts, EF light oil, F coal dusts, OFA, L-AA, U-AA.Whole burner is fixedly connected with water-cooling wall, and with
Water-cooling wall expands downwardly together.Four layers of additional burnout degree nozzle are disposed with 7.2m above away from upper strata coal dust nozzle centerline,
Its effect is to supplement the air required for fuel after burning, while realizes that fractional combustion reaches reduction in-furnace temperature level,
Suppress NOXGeneration, after-flame wind combustor forms low NO together with coal burnerXCombustion system.
Anistree tangential firing main feature is as follows：
1) burnt whole burner hearth as two large-scale combustion device tissues, therefore the control of the air quantity, powder amount to every burner
System is simple.
2) when boiler load changes, burner is switched by layer, makes each horizontal cross-section heat load distribution of burner hearth uniform.
3) it is strong to coal adaptability.
4) because the rotation of burner hearth interior air-flow is strong, mixed with pulverized coal particle, and extend pulverized coal particle and flowed in stove
Dynamic distance.
5) solves the problems, such as boiler furnace outlet or so gas temperature windage.
The burner performance parameter of table 3
The burner of table 4 aids in wind parameter
Pulverized coal preparation system uses the direct-firing system of Beijing Electrical Equipment Factory ZGM123G-II medium-speed pulverizer malleations, and 6 are matched somebody with somebody per stove
Coal pulverizer.5 are put into operation during BMCR, and one standby.Coal pulverizer outlet fineness of pulverized coal is that (coal pulverizer producer carries R90=16.5%
For).One layer of burner of every grinding belt, every a wind pipe are respectively arranged with the pulverized coal distributor being divided into two, and are supplied to two burnings
Device.
Air and gas system presses balanced draft design.Three points of storehouse rotor swingings of air preheater system, are divided into First air, Secondary Air
And flue gas system.Every burner is equipped with flame detecting device, and system is provided with the fire defector cooling wind of two 100% capacity
Machine, an operation, one standby.The Blade Adjustable Axial of two 50% capacity merged with desulphurization devices is provided with after deduster
Streaming air-introduced machine, the stove of flue gas two after desulfurization share double steel inner cylinder sleeve-type chimneys discharge of a seat height 240m.Two are set per stove
The adjusting rotor blade primary air fan and pressure fan of the seal fan of 100% capacity, two 50% capacity.
Pilot project and purpose：
Cold conditions is divulged information and aerodynamic field tests damper, pressure tester, the burner of the air and gas system mainly to boiler
Nozzle is checked comprehensively, and the apparatus for measuring air quantity of system is demarcated.Can be straight by cold conditions ventilation and aerodynamic field experiment
Whether phenomena such as seeing the distribution of gas stream in the stove, diffusion, disturbance, mixing be good, it can be found that boiler-burner and each wind pipeline are set
The problem of meter, installation, air distribution there may be, reference frame is provided for hot operation, firing optimization.Tried by aerodynamic field
Test, can intuitively the distribution of gas stream in the stove, diffusion, disturbance, mixing phenomena such as it is whether good.
Cold conditions and aerodynamic field main experimental project are as follows：
1) project such as first and second damper, secondary air box (secondary air register), burner inspection；
2) coal pipe air velocity adjusting；
3) pulverizer' s primary air flow measurement apparatus is demarcated；
4) secondary air flow measurement apparatus is demarcated；
5) burner nozzle measuring wind speed；
6) horizontal flue flow velocity measures；
7) air dynamic field test：Stove inner section wind speed, adherent measuring wind speed and ribbon experiment.
2. test principle and data processing method
Test measurement principle：
1) leveling of boiler First air
In order to ensure that boiler has a good aerodynamic field, boiler First air should leveling, its cold conditions wind speed deviation should
The control is within 10%.The measurement and tracer of aerodynamic field are just carried out after air velocity adjusting.
2) under cold conditions burn the circle of contact measurement
In the cold test of routine, the method for measurement can be used to realize the size of the orlop burner circle of contact.Measurement
Before, " ten " wordline is arranged in position along burner hearth center line between first layer and second layer burner, during measurement, measures people
Member station is on furnace bottom large platform, along " ten " wordline according to certain interval measurement tangential velocity.In the cold test of reality, gas
Stream is that comparison is disorderly, and measuring instrument is often difficult to accurate reading, and the measurement for the circle of contact that burns is as reference.
3) measurement of the adherent wind speed of burner hearth
Measure the purpose of adherent wind speed：When degree of filling of the observation air-flow in stove, can by measuring the adherent wind speed of burner hearth
Substantially to judge the size of gas stream in the stove stagnant wake；Second, whether observation air-flow washes away furnace wall, if air-flow is adherent or to one
Wing furnace wall tilts, then the axially and tangentially speed of the wing furnace wall annex air-flow can be bigger than the speed of other furnace wall annex air-flows.
4) measurement of furnace outlet velocity flow profile
The overtemperatute of the gas temperature windage of boiler furnace outlet, Temperature Deviation and tube wall temperature, often with furnace outlet
The deviation of air-flow velocity has very big relation.The wind speed profile of 3 different levels of general measure, can be with each absolute altitude
It is spaced 1m measurements a bit.
Data processing method：
Air mass flow is according to following calculation expression：
V=3600WpjA (1)
Wherein：V、VnFor the measured discharge and the flow being converted under standard state, m of air3/h；
A be measured section area, m2；
WpjIt is air-flow in the average speed of measured section, m/s；
W is calculated according to following calculation expressionpj
Wherein：ΔpdFor dynamic pressure measurement value, Pa；
KdFor correction factor；
ρ、ρnThe density under actual measurement and standard state for air-flow, kg/m3, for air:ρn=1.293kg/m3；
Wherein：PactTo survey atmospheric pressure, unit Pa
HaFor the static pressure of pipeline interior air-flow, unit Pa
Its definition of speed unevenness coefficient is：
Wherein,
xiFor the parameter value of each measuring point,For average value, deviation is smaller, and velocity distribution uniformity is better.δ is mark
Quasi- deviation, CvFor relative standard deviation.
Test result analysis are with discussing：
1) inspection of air and flue system and damper
The transmission of air and flue system damper checks, the inspection result in cigarette air channel：Cleaned out inside cigarette, air channel, without miscellaneous
Thing；Once, send, air-introduced machine imports and exports baffle plate flexible movements, instruction is correct, coal pulverizer correlation air door, baffle plate flexible movements, instruction
Correctly；Secondary air box has been cleaned out, no-sundries；Secondary air register, center air door switch are flexible, and instruction is correct.
2) burner inspection
Into burner hearth, in face of burner, combustor air flow is in the right direction, is consistent with design.Burner is checked, it installs feelings
Condition is good, no-sundries in burner, burner secondary air register flexible movements.
3) coal pipe air velocity adjusting
4 coal pipes corresponding to same coal pulverizer are measured with the backing tube demarcated, to certain root coal pipe
The deviation of the average value of wind speed and 3 coal pipe wind speed will adjust shrinkage cavity more than ± 5%.In advance by shrinkage cavity standard-sized sheet, only need by
The higher shrinkage cavity of wind speed turns down.Result such as table 5 below after coal pipe air velocity adjusting, wherein, A mills refer to A coal pulverizers in table, its
He is similar.As can be drawn from Table 4, A, B, C, D, E, F grind speed relative standard deviation be respectively 2.2%, 2.4%, 1.3%,
1.8%th, 2.3%, 2.4%, 6 coal pulverizer coal pipe velocity standard deviations are both less than 5%, illustrate that coal pipe wind speed has compared
Uniformly, adjustment achieves preferable effect.
Result after the coal pulverizer coal pipe wind speed cold conditions leveling of table 5
4) it is grinding into a mouthful primary air flow demarcation
Coal pulverizer inlet primary air flow is demarcated.In this cold test, the survey of two operating modes has been carried out to each air quantity respectively
Amount, by adjusting primary air fan output and changing coal pulverizer cold-hot wind pitch baffle opening, provide two differences of every coal pulverizer
Operating mode.The air quantity of each operating mode is calculated using backing tube meter, with showing that air quantity is contrasted on DCS, amendment is calculated
Coefficient.The primary air flow calibration result of six coal pulverizers is shown in Table 6.
The coal pulverizer inlet primary air flow calibration result of table 6
5) secondary air flow is demarcated
The demarcation of secondary air flow adjusts secondary air box pressure by changing pressure fan movable vane aperture, to adjust operating mode mark
Quasi- backing tube (backrest tube cofficients is 0.80) presses the wind speed of grid survey Secondary Air, so as to calculate corresponding secondary air flow.Two
The demarcation of secondary air quantity has carried out three operating modes altogether, shows that air quantity compares with DCS by actual survey calculation air quantity, obtains secondary
The correction factor of air quantity.It the results are shown in Table 7-9.
The Secondary Air air flow calibration operating mode 1 of table 7
The Secondary Air air flow calibration operating mode 2 of table 8
The Secondary Air air flow calibration operating mode 3 of table 9
6) burner nozzle wind speed is tested
Air current flow when being tested in order to ensure boiler cold-state in burner hearth enters flow field law, and equal obtain is counted according to Euler 2
(taken to cold conditions secondary wind speed)
Wherein：ω is fluid wind speed, and t is fluid temperature (F.T.), and ρ is fluid density, and lower footnote 1 and 2 represents First air and secondary
Wind；Δ is secondary wind resistance；MCold conditions is represented, O represents hot.
To ensure that boundary condition is similar, ensure that cold conditions and hot primary and secondary air ratio of momentum are equal, i.e.,：
Wherein k is the coefficient for considering that coal dust flow velocity is different from wind speed, and it is dense for the quality of pc in First air to be taken as 0.8, u
Degree, kg/kg, is taken as 0.61.
In cold conditions, t1M=t2M, actual airflow temperature is 20 DEG C during cold conditions, then obtains primary air velocity according to (8), (9) formula
For：
Boiler Main Parameter under the boiler BMCR operating modes of table 10
According to the data of table 10, it is ω that secondary wind speed under cold conditions, which is calculated,2M=38.7m/s, wind speed is cold conditions next time
ω1M=28.9m/s.
Using the plane where A layer coal burners as test platform, wind, A layers First air, AB1 is aided in AA to aid in wind, AB
Oil auxiliary wind has carried out measuring wind speed.Burner nozzle wind speed determines according to above-mentioned cold model experiment principle.During measurement, burner hearth is born
Pressure maintains -115.1Pa, and pressure fan blast is respectively 2.07kPa, 1.90kPa, primary air fan blast be respectively 9.18kPa,
9.23kPa, burner hearth right side secondary air flow are 1982t/h, and burner hearth left side secondary air flow is 1683t/h.As a result such as table 11 below.
The burner wind speed of table 11 is tested
From measurement result as can be seen that AB oil auxiliary wind, AB1 auxiliary wind, A layers First air, the speed at 8 angles of AA auxiliary wind
Relative standard deviation is respectively 22.59%, 22.09%, 14.98%, 36.5%.Therefore AA auxiliary 8 angle wind speed speed phases of wind
Larger to standard deviation, this is on the one hand due to the strong turbulent fluctuation characteristic of cold conditions flow process in stove, the actual measurement in scene
For finite number strong point, the characteristics of velocity amplitude for causing actually to measure is difficult actual response actual speed turbulent fluctuation, in addition may be used
Energy reason is that 8 angle damper characteristics have differences, under same aperture, due to poor present on air door structure
It is different, cause wind speed to have certain difference.
7) horizontal flue air velocity is tested
The lack of homogeneity of furnace outlet (horizontal flue) flue gas flow rate easily causes furnace outlet gas temperature deviation, causes both sides
Temperature Deviation is larger, and the safety and economic operation of unit is impacted.In addition, outlet air flow velocity is too small, level is easily caused
Flue and fouling of heating surface afterwards are serious, and the safe operation to unit also brings harm.Therefore, also surveyed in this cold test
The air velocity in furnace outlet section is tried, point high, medium and low three layers of measurement, it is intended to check the uniformity and size of exit flow
Situation.Test result is as shown in the figure shown in 2.
From test result as can be seen that Fig. 2 (a), 2 (b), 2 (c) speed relative standard deviation be respectively 4.97%,
9.72%th, 12.52%.As can be seen here, interval velocity relative deviation is larger under horizontal flue, in, upper interval velocity relative standard deviation
It is smaller.The left air velocity by side wall of stove is relatively small, may exist dead angle cause it is hot in the case of dust stratification, it is proposed that hot
To strengthen the soot blowing to this band of position in operation, when preventing hot operation, horizontal flue dust stratification is serious.
8) adherent wind measurement in stove
Due to the strong mixing of rotating jet, the direction of air velocity can not have significantly been judged at the adherent place of burner hearth,
It is small when big when being shown as in the test of speed, at times strong and at other times weak, or even speed is " zero ".So the adherent wind of burner hearth takes 10 seconds
Measurement arithmetic mean of instantaneous value, directionless difference.According to field test situation, adherent wind corresponding to selection middle level burner is surveyed
Amount, measurement result are as shown in Figure 5.Due to the complexity of fluid field in furnace, adherent wind direction can not clearly judge.Forward and backward, left,
The average adherent wind speed of right wall is relatively small, and wall average adherent wind speed in front, rear, left and right is respectively 1.85m/s, 2.42m/s,
2.76m/s, 1.33m/s, illustrate substantially not wash away water-cooling wall phenomenon, the adherent wind mean wind speed of left side wall is more adherent than front-back wall
Wind mean wind speed is slightly larger.
Fig. 4-7 is the adherent wind wind speed profile of front, rear, left and right wall.Front wall is can be seen that from the adherent wind wind speed of Fig. 4 front walls to lean on
The regional area wind speed of nearly right wall is relatively low, the minimum 0.1m/s of wind speed size.
The adherent wind wind speed of wall relatively low, the minimum 0.2m/ of wind speed that can be seen that regional area wind speed in the middle part of rear wall after Fig. 5
S, other region demeanour are higher.
It can be seen that from the adherent wind wind speed of the left walls of Fig. 6 and the relatively low region of wind speed do not occur, left wall is close to preceding wall zone
There are indivedual point wind speed relatively low, reached 0.74m/s.
It can be seen that from the adherent wind wind speed of the right walls of Fig. 7 and the relatively low region of wind speed, minimum wind speed occur in right wall central region
For 0.1m/s, there is not the relatively low region of wind speed in other regions.
This concrete application example has carried out the ventilation of certain Power Plant No.2 boiler cold-state and aerodynamic field experiment.It is complete by cold test
Into the demarcation of each air quantity measuring point, it is all right to demonstrate the cold conditions ventilation aerodynamic field of No. 2 boilers, be unit hot starting, hot start and
Experiment in 168 hours is laid a good foundation, and main cool power field rule is as follows：
(1) A, B, C, D, E, F grind speed relative standard deviation be respectively 2.2%, 2.4%, 1.3%, 1.8%, 2.3%,
2.4%, 6 coal pulverizer coal pipe velocity standard deviations are both less than 5%, illustrate coal pipe wind speed than more uniform, adjustment takes
Obtained the effect of preferable satisfaction.
(2) measurement of two operating modes has been carried out to coal pulverizer inlet primary air flow respectively, has been contributed by adjusting primary air fan
And change coal pulverizer cold-hot wind pitch baffle opening, two different operating modes of every coal pulverizer are provided, have obtained coal pulverizer inlet
The calibration coefficient of primary air flow；
(3) secondary air box pressure is adjusted by changing pressure fan movable vane aperture, has obtained the calibration coefficient of secondary air flow；
(4) by burner in the stove measuring wind speed, AB oil auxiliary wind, AB1 auxiliary wind, A layers First air, AA auxiliary have been obtained
The speed relative standard deviation at 8 angles of wind is respectively 22.59%, 22.09%, 14.98%, 36.5%.AA aids in 8 angle wind of wind
Degree of hastening relative standard deviation is larger, and this is on the one hand due to the strong turbulent fluctuation characteristic of cold conditions flow process in stove, scene
Finite number strong point is actually measured as, the velocity amplitude for causing actually to measure is difficult the spy of actual response actual speed turbulent fluctuation
Point, possible cause is that 8 angle damper characteristics have differences in addition, under same aperture, due on air door structure
Existing difference, wind speed is caused to have certain difference.
(5) speed relative standard deviation is respectively 4.97%, 9.72%, 12.52%.As can be seen here, horizontal flue lower floor
Speed relative deviation is larger, in, upper interval velocity relative standard deviation it is smaller.The left air velocity by side wall of stove is relatively small, can
Can exist dead angle cause it is hot in the case of dust stratification, it is proposed that to strengthen the soot blowing to this band of position in hot operation, prevent
Only during hot operation, horizontal flue dust stratification is serious.
(6) the average adherent wind speed of front, rear, left and right wall is relatively small, the average adherent wind speed difference of front, rear, left and right wall
For 1.85m/s, 2.42m/s, 2.76m/s, 1.33m/s, illustrate substantially not wash away water-cooling wall phenomenon, the adherent wind of left side wall is put down
Equal wind speed wind mean wind speed more adherent than front-back wall is slightly larger.
(7) do not occur larger it can be found that stove inner section velocity field is reasonably distributed by the tracer of ribbon in experiment
Eddy flow area, meet anistree circle of contact cool power field flowing law, demonstrate burner in the stove design rationality, be boiler hot
State operation is laid a good foundation.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (6)
1. a kind of ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method, it is characterised in that including as follows
Step：
Check the air and flue system and damper of ultra supercritical anise circle of contact coal-fired power station boiler；
Check the burner of the ultra supercritical anise circle of contact coal-fired power station boiler；
Cold conditions leveling is carried out to the coal pipe wind speed of the ultra supercritical anise circle of contact coal-fired power station boiler；
Primary air flow demarcation is carried out to the coal pulverizer inlet of the ultra supercritical anise circle of contact coal-fired power station boiler；
Secondary air flow demarcation is carried out to the secondary air box of the ultra supercritical anise circle of contact coal-fired power station boiler；
The burner nozzle wind speed of the ultra supercritical anise circle of contact coal-fired power station boiler is tested；
The horizontal flue air velocity of the ultra supercritical anise circle of contact coal-fired power station boiler is tested；
Test pasting wind sheltering speed in the stove of the ultra supercritical anise circle of contact coal-fired power station boiler；
With reference to the inspection result of the air and flue system and damper, the inspection result of the burner, the coal pipe wind speed
Leveling result, the primary air flow calibration result of the coal pulverizer inlet, the secondary air flow calibration result of the secondary air box, institute
The test result of burner nozzle wind speed is stated, the interior patch wind sheltering speed of the test result of the horizontal flue air velocity, the stove
Test result, obtain the cool power field rule of the ultra supercritical anise circle of contact coal-fired power station boiler；Wherein, the cold conditions is moved
Field of force rule includes the calibration coefficient of coal pulverizer inlet primary air flow, the calibration coefficient of secondary air flow, horizontal flue air velocity
The rule of each layer relative deviation；
The process bag that the horizontal flue air velocity to the ultra supercritical anise circle of contact coal-fired power station boiler is tested
Include step：Horizontal flue section is divided into high level, middle level, low layer, the air velocity of high level, middle level, low layer surveyed respectively
Examination；Wherein：
Air mass flow is according to V=3600WpjA、Calculate, V, VnFor air measured discharge and be converted into mark
Flow under quasi- state, A be measured section area, WpjFor air-flow measured section average speed；According toCalculate Wpj, Δ pdFor dynamic pressure measurement value, KdFor correction factor, ρ, ρnActual measurement and standard state for air-flow
Under density, PactTo survey atmospheric pressure, HaFor the static pressure of pipeline interior air-flow；
The process that wind sheltering speed is tested is pasted in the stove to the ultra supercritical anise circle of contact coal-fired power station boiler includes step
Suddenly：Adherent wind speed corresponding to choosing middle level burner measures, wherein, adherent wind takes the measurement data in 10 seconds in the stove
Arithmetic mean of instantaneous value.
2. ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method according to claim 1, it is special
Sign is that the process of the air and flue system for checking ultra supercritical anise circle of contact coal-fired power station boiler and damper is including as follows
Step：
Whether the cigarette air channel of detection ultra supercritical anise circle of contact coal-fired power station boiler has been cleaned out, no-sundries；Detection is super
Critical anistree circle of contact coal-fired power station boiler once, give, air-introduced machine inlet and outlet baffle plate action it is whether flexible, if instruction is correct；
Whether coal pulverizer correlation air door, the baffle plate action for detecting ultra supercritical anise circle of contact coal-fired power station boiler are flexible, if instruction is just
Really；Whether the secondary air box of detection ultra supercritical anise circle of contact coal-fired power station boiler has been cleaned out, no-sundries, and detection is super to face
Whether secondary air register, the center air door switch of boundary's anise circle of contact coal-fired power station boiler are flexible, if instruction is correct.
3. ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method according to claim 1, it is special
Sign is that the process of the burner for checking the ultra supercritical anise circle of contact coal-fired power station boiler comprises the following steps：
It is coal-fired in face of the ultra supercritical anise circle of contact into the burner hearth of the ultra supercritical anise circle of contact coal-fired power station boiler
Whether the burner of station boiler, detection combustor air flow direction are correct, if with the coal-fired electricity of the ultra supercritical anise circle of contact
The design of boiler of standing is consistent, and checks the installation situation of burner；Detect burner in whether no-sundries；Detect burner two
Whether secondary air door action is flexible.
4. ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method according to claim 1, it is special
Sign is that the coal pipe wind speed to the ultra supercritical anise circle of contact coal-fired power station boiler carries out the process bag of cold conditions leveling
Include following steps：
4 coal pipes corresponding to same coal pulverizer are measured with the backing tube demarcated, if the coal pipe currently measured
Wind speed and the absolute value of deviation of average value of other 3 coal pipe wind speed when being more than 5%, adjust the coal pipe that currently measures
Shrinkage cavity.
5. ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method according to claim 1, it is special
Sign is that the coal pulverizer inlet to the ultra supercritical anise circle of contact coal-fired power station boiler carries out the mistake of primary air flow demarcation
Journey comprises the following steps：
The measurement of two operating modes is carried out to each coal-grinding fan delivery respectively, it is cold and hot by adjusting primary air fan output and change coal pulverizer
Wind pitch baffle opening, provide two different operating modes of every coal pulverizer；Measured using backing tube and calculate the reality of each operating mode
Air quantity is surveyed, by the actual measurement air quantity with showing that air quantity is contrasted on DCS, calculates the correction factor of each coal pulverizer.
6. ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method according to claim 1, it is special
Sign is that the secondary air box to the ultra supercritical anise circle of contact coal-fired power station boiler carries out the process of secondary air flow demarcation
Comprise the following steps：
Secondary air box pressure is adjusted by changing pressure fan movable vane aperture, it is secondary by grid survey to adjust operating mode backing tube
The wind speed of wind, so as to calculate corresponding secondary air flow, the actual measurement air quantity of secondary air flow is obtained, will shown on the actual measurement air quantity and DCS
Show that air quantity is contrasted, calculate the correction factor of secondary air flow, wherein, the coefficient of the backing tube is 0.80.
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| CN107741028A (en) * | 2017-10-23 | 2018-02-27 | 新疆电力建设调试所有限责任公司 | The small air door cold and hot state fitting control method of quadrangle tangential circle pulverized-coal fired boiler Secondary Air |
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| CN109060390A (en) * | 2018-06-26 | 2018-12-21 | 珠海市蓝海工业技术有限公司 | A kind of coal-fired plant boiler aerodynamic field experimental method based on inspection platform |
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| CN110094719A (en) * | 2019-05-17 | 2019-08-06 | 中国能源建设集团安徽电力建设第一工程有限公司 | A kind of circle type coal burner installation method |
| CN112797438B (en) * | 2019-07-15 | 2022-07-19 | 苏州西热节能环保技术有限公司 | Method for preventing and treating ash blockage of flue gas channel at tail part of double-tangential-circle combustion boiler |
| CN110967210B (en) * | 2019-12-27 | 2022-05-10 | 国网河北省电力有限公司电力科学研究院 | Netted measurement system of swirl burner spout cold flow field |
| CN111457418A (en) * | 2020-04-09 | 2020-07-28 | 中国能源建设集团西北电力试验研究院有限公司 | Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air |
| CN111664443A (en) * | 2020-05-28 | 2020-09-15 | 国网河北省电力有限公司电力科学研究院 | Cold state research method for adjusting smoke temperature deviation of two sides of tetragonal tangential boiler |
| CN113324774B (en) * | 2021-04-09 | 2022-03-18 | 华电电力科学研究院有限公司 | Cold-state ventilation test method for ultra-supercritical opposed-impact cyclone combustion boiler |
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