CN106678783B - A kind of combustion optimizing system and method for adjustment preventing water wall high temperature corrosion - Google Patents
A kind of combustion optimizing system and method for adjustment preventing water wall high temperature corrosion Download PDFInfo
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- CN106678783B CN106678783B CN201710104624.1A CN201710104624A CN106678783B CN 106678783 B CN106678783 B CN 106678783B CN 201710104624 A CN201710104624 A CN 201710104624A CN 106678783 B CN106678783 B CN 106678783B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
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- Thermal Sciences (AREA)
Abstract
The invention discloses a kind of combustion optimizing systems and method of adjustment preventing water wall high temperature corrosion.The combustion optimizing system includes wind powder adjusting apparatus, Secondary Air allocation of the amount of air regulating device, water-cooling wall near wall region flue gas composition measuring device, auxiliary fire air nozzle, temperature field measuring apparatus and economizer exit Oxygen Amount in Flue Gas field measurement device；It is respectively equipped with corresponding wind powder adjusting apparatus on the corresponding First air pulverized coal channel of each burner；Corresponding secondary air flow distribution regulating device is respectively equipped in each secondary air bellow；Water-cooling wall near wall region flue gas composition measuring device is two, is separately mounted at boiler both walls water-cooling wall；It is multiple to assist fire air nozzle, is separately positioned below fire air nozzle；Temperature field measuring apparatus is set in burner hearth, below pendant superheater；Economizer exit Oxygen Amount in Flue Gas field measurement device is set at economizer exit flue.The water wall high temperature corrosion for the swirl flow combustion boiler that liquidates can be effectively relieved using combustion optimizing system of the present invention.
Description
Technical field
The invention belongs to steam power plant fields, and in particular to one kind can effectively prevent opposed firing swirl flow combustion
The burning optimization method of adjustment and system of boiler water-cooling wall high-temperature corrosion are particularly suitable for the combustion using the swirl flow combustion boiler that liquidates
Coal power generation unit.
Background technology
As the opposed firing swirl flow combustion boiler of one of three big primary combustion mode of station boiler, because of combustion apparatus and
Advantage in terms of heating surface arrangement becomes one of the combustion system that domestic overcritical and ultra-supercritical boiler mainly uses, in state
Occupy prodigious share in interior in-service fired power generating unit.In order to realize efficient, economic, environmentally friendly operation, such type of furnace generally use is empty
The mode of gas fractional combustion+low NO controls NOxDischarge.
Though NO can be reduced by being formed by stove strong reducing zone using low-NO_x combustion technologyxDischarge, but to boiler safety
Operation brings some row problems.First, a large amount of strong corrosive gases, such as H are contained in the gas of reducing zone2S.The gas is in certain item
The iron oxide protective film of water cooling wall surface is highly vulnerable to breakage under part, it is rotten serious sulfide type high temperature occur so as to cause water-cooling wall
Erosion.Secondly, Deoxidation Atmosphere in Furnace enhancing, the grey melting temperature of coal will also be greatly lowered, this not only results in the regional water
Cold wall Serious Slagging, but also the high temperature corrosion of heating surface can be accelerated.With NOxThe increasingly raising of emission request, power plant in order to
Further decrease NOxDischarge capacity constantly enhances the degree of air classification, reduces primary zone and reducing zone oxygen amount, increases burnout degree
Ratio, but the way so that water wall high temperature corrosion problem is more prominent.After high temperature corrosion occurs for water-cooling wall, wall thickness reduction, by force
Degree reduces, and booster easily occurs, causes unit is non-to stop, it has also become puzzlement Chinese large-sized coal-fired power station boiler is especially the eddy flow that liquidates
Burning boiler uses the chronic illness after low-NO_x combustion technology.
For rushing for swirl flow combustion boiler, since combustion method and chamber structure are special in stove, water-cooling wall high temperature
Corrosion occurs mainly on the left and right sides wall of primary zone and reducing zone.For swirl flow combustion boiler both sides of alleviating or solve to liquidate
Wall water wall high temperature corrosion, currently used method are mainly the following：
1, water-cooling wall surface spraying is handled.Anticorrosion with painting processing is carried out to water cooling wall surface using corrosion-resistant material.Mesh
Before, which is most widely used, but there are the problems such as costly, the protection period is short, cannot fundamentally solve water-cooling wall height
Warm etching problem.
2, implement adherent wind transformation.In water wall high temperature corrosion critical regions by trepanning or setting spout, by a small amount of two
Secondary wind is sent into burner hearth, ensures that the air being sent into burner hearth is flowed along wall surface, to improve water-cooling wall near wall region oxygen amount, prevents water
The generation of cooling wall high-temperature corrosion.But show side water wall trepanning or setting spout simultaneously from the operation result of retrofitted unit
Stable wind film can not be formed in water cooling wall surface, it is limited to the protective action of water wall high temperature corrosion, and influence boiler combustion
Efficiency, discharged nitrous oxides concentration, or even cause coke heavy in stove.
3, burning optimization adjusts.By optimizing and revising in operation, improves oxygen in both walls water-cooling wall near wall region flue gas and contain
Amount, to the generation for preventing high temperature corrosion from reacting.Currently, the adjustment of Thermal generation unit boiler combustion optimization is typically all from air distribution
On set about, liquidate swirl flow combustion boiler all by the way of so-called " bowl formula air distribution ", i.e., from both sides to intermediate combustion device air door
Aperture is gradually reduced, and improves both walls water-cooling wall near wall region oxygen amount, but have the following problems by actual motion discovery：
（1）The effect for improving both walls water-cooling wall near wall region oxygen amount is not obvious.It is found through a large number of experiments and actual motion,
Intermediate combustion device Secondary Air air door is closed to 15 ~ 20%, close to side wall burner secondary air register standard-sized sheet, both walls water cooling in experiment
Wall near wall region oxygen amount slightly increases, but in actual operation, and burner Secondary Air throttle opening, which is adjusted too small operation, has peace
Burner Secondary Air throttle opening is adjusted excessive influence coal powder ignition and after-flame by full hidden danger, and air distribution, which is optimized and revised, improves both sides
The effect of wall water-cooling wall near wall region oxygen amount is not obvious.
（2）Air quantity can not be effectively matched with swirl strength, influence efficiency of combustion and stability.The swirl flow combustion boiler that liquidates is adopted
Burner is turbulent burner.The burner forms recirculating zone volume at a certain distance from away from spout by swirl vane and inhales height
Warm flue gas firing coal-dust has extremely strong steady combustion characteristic.Swirl vane is also the wind of control burner Secondary Air intake simultaneously
Door.In adjustment, although the throttle opening of close side wall burner is excessive to increase air quantity, swirl strength is reduced, it is unfavorable
It catches fire in time in coal dust, influences coal dust after-flame.Though the burner throttle of intermediate region is too small to reduce air quantity, eddy flow is increased
Intensity, can lead to problems such as to catch fire in advance, burn nozzle, whitewash a wall.
（3）Thermal deviation is big, and spray water flux is high, and unit economy declines.Liquidate empir-ical formulation effect in swirl flow combustion Boiler Furnace
Fruit is very poor, and being unevenly distributed for temperature field in furnace and flue gas flow field is inevitably resulted in using non-uniform air distribution burning, it is this it is uneven from
Primary zone can be extended to always economizer exit, thus cause to shield, exceed, the high heating surfaces uneven heating such as again, exist it is hot partially
Difference, and then attemperation water flow is caused to increase, unit economy declines.
Invention content
The purpose of the present invention is to solve defects existing in the prior art, and water-cooling wall can be effectively relieved by providing one kind
The combustion optimizing system of high temperature corrosion.
In order to achieve the above object, the present invention provides a kind of combustion optimizing systems preventing water wall high temperature corrosion, should
Combustion optimizing system is for the swirl flow combustion boiler that liquidates；Including wind powder adjusting apparatus, Secondary Air allocation of the amount of air regulating device, water cooling
Wall near wall region flue gas composition measuring device, auxiliary fire air nozzle, temperature field measuring apparatus and economizer exit Oxygen Amount in Flue Gas field
Measuring device；Wind powder adjusting apparatus is multiple, the corresponding First air pulverized coal channel of each burner to liquidate in swirl flow combustion boiler
On be respectively equipped with corresponding wind powder adjusting apparatus；It is multiple that secondary air flow, which distributes regulating device, is liquidated in swirl flow combustion boiler
Corresponding secondary air flow distribution regulating device is respectively equipped in each secondary air bellow；Each secondary air flow distribution regulating device is wrapped
Multiple baffle arrangements are included, each baffle arrangement adjustable angle saves land in corresponding secondary air bellow；Water-cooling wall near wall region flue gas
Component measuring device is two, at the both walls water-cooling wall for the swirl flow combustion boiler furnace that is separately mounted to liquidate；Assist burnout degree
Spout is multiple, is separately positioned in the swirl flow combustion boiler that liquidates below fire air nozzle；Temperature field measuring apparatus is set to burner hearth
Below interior, pendant superheater；Economizer exit Oxygen Amount in Flue Gas field measurement device is set at economizer exit flue.
The baffle arrangement quantity for forming each secondary air flow distribution regulating device is corresponding secondary air bellow inner burner number
Amount subtracts 2；The burner being equipped in secondary air bellow is divided into both ends burner and intermediate combustion device；Both ends burner is two, point
Not Wei Yu secondary air bellow both ends inlet；Intermediate combustion device is located among two both ends burners；Each baffle arrangement difference
Set on the air intake vent end of corresponding intermediate combustion device.
Wherein, each baffle arrangement includes three block baffles, is rotatably arranged in Secondary Air wind by electric rotation shaft respectively
At the corresponding different inner walls of case, and three electric rotation shafts are located on same longitudinal section；When baffle arrangement three block baffles with it is corresponding
Inner wall when being in 90 degree, the shielded area of baffle arrangement is the 30 ~ 50% of secondary air bellow longitudinal section area.
Baffle is trapezoidal, and it is the 80 ~ 90% of the baffle and the secondary air bellow inner wall joint length of side to go to the bottom, and upper bottom is bottom
70 ~ 80%, highly 10 ~ 15% for the another side length of side vertical with the joint length of side.
When the swirl flow combustion boiler that liquidates is 300MW grades, auxiliary fire air nozzle is 4, is arranged in the wall circle of contact；When
When the swirl flow combustion boiler that liquidates is 600MW or 1000MW grades, auxiliary fire air nozzle is 8, is arranged in double circle of contacts.
Fire air nozzle is assisted to be set to below fire air nozzle at 1-2m.
Combustion optimizing system of the present invention further includes control unit；Control unit respectively with wind powder adjusting apparatus, secondary air flow
It distributes regulating device, water-cooling wall near wall region flue gas composition measuring device, auxiliary fire air nozzle, temperature field measuring apparatus and saves coal
Device exiting flue gas oxygen amount field measurement device is connected.
The present invention also provides the method for carrying out burning optimization adjustment using above-mentioned combustion optimizing system, this method passes through institute
Water-cooling wall near wall region flue gas composition measuring device is stated to water-cooling wall near wall region O2, CO and H2S concentration is measured in real time, passes through wind
Powder adjusting apparatus and secondary air flow distribution regulating device regulate and control to enter quality of pc flow rate and Secondary Air in each burner respectively
Air quantity, each burner quality of pc distribution of flow rate being located in the same secondary air bellow is made to be gradually reduced by centre to both sides,
Secondary Air air quantity is gradually increased by centre to both sides, and makes water-cooling wall near wall region O2, CO and H2S concentration meets simultaneously：O2≥
1.5%、H2S≤100ppm、CO≤2000ppm；The temperature in pendant superheater lower furnace section is monitored by temperature field measuring apparatus
Field is spent, the oxygen amount field of economizer exit flue, control burnout degree spray are monitored by economizer exit Oxygen Amount in Flue Gas field measurement device
The outlet air quantity of mouth and auxiliary fire air nozzle, makes the uniform temperature fields in pendant superheater lower furnace section, economizer exit
The Oxygen Amount in Flue Gas field of the oxygen amount field of flue is uniform.
As the water-cooling wall near wall region O that the flue gas composition measuring device measures2, CO and H2S real-time concentrations：O2＜ 1.5%,
H2When S ＞ 100ppm or CO ＞ 2000ppm, the specific regulative mode of wind powder adjusting apparatus and secondary air flow distribution regulating device
For：Increase the angle of the baffle arrangement and bellows inner wall of the Secondary Air allocation of the amount of air regulating device by two close end burner, improves
The Secondary Air intake of both ends burner, reduction both ends burner correspond to the wind powder regulating device on First air pulverized coal channel and open
Degree reduces the quality of pc flow rate of both ends burner.
Burning optimization method of adjustment of the present invention, is as follows：
（1）Before boiler startup, the inside and outside Secondary Air blade opening of each burner is adjusted, and makes to be located at the same Secondary Air wind
The inside and outside Secondary Air blade opening of each burner in case is consistent；When boiler startup, the wind powder tune on First air pulverized coal channel is adjusted
Engagement positions keep each burner First air air quantity being located in the same secondary air bellow identical with pulverized coal flow；
（2）After boiler thermal-state is stable, the water-cooling wall near wall region O that is detected by flue gas composition measuring device2, CO and
H2S real-time concentrations are sent to the control system, control wind powder adjusting apparatus by control system and secondary air flow distribution adjusts dress
Quality of pc flow rate and Secondary Air air quantity that regulation and control respectively enter in each burner are set, water-cooling wall near wall region O is made2, CO and H2S is dense
It spends while meeting：O2≥1.5%、H2S≤100ppm、CO≤2000ppm；When the water-cooling wall that the flue gas composition measuring device measures
Near wall region O2, CO and H2S real-time concentrations：O2＜ 1.5%, H2When S ＞ 100ppm or CO ＞ 2000ppm, the wind powder adjusting apparatus
With secondary air flow distribute regulating device specific regulative mode be：The Secondary Air allocation of the amount of air increased by two close end burner is adjusted
The angle of the baffle arrangement and bellows inner wall of device improves the Secondary Air intake of both ends burner, reduces both ends burner pair
The wind powder regulating device aperture on First air pulverized coal channel is answered, the quality of pc flow rate of both ends burner is reduced；Allocation of the amount of air tune
The each adjusting angle of each baffle is 5 ~ 10 degree in engagement positions, and the amplitude of accommodation of wind powder regulating device is 5 ~ 10 degree, is adjusted every time
Afterwards after 5 ~ 10min of stably measured, then carry out next adjustment；
（3）The temperature field for monitoring pendant superheater lower furnace section by temperature field measuring apparatus simultaneously, passes through flue gas
Oxygen amount field measurement device monitors the oxygen amount field of economizer exit flue, and monitoring data are sent to the control system, by controlling
System control fire air nozzle processed and the outlet air quantity for assisting fire air nozzle, make the temperature in pendant superheater lower furnace section
Uniformly, the Oxygen Amount in Flue Gas field of the oxygen amount field of economizer exit flue is uniform for field；Specifically adjustment mode is：If section of burner hearth flue gas temperature
It is low to spend height, both sides among the appearance of field, appearance intermediate distribution characteristics low, both sides are high in oxygen content at economizer outlet field then increases auxiliary
Burnout degree air quantity reduces burnout degree air quantity；If there is opposite distribution characteristics, reduces auxiliary burnout degree air quantity, increase after-flame
Wind air quantity.
The present invention has the following advantages compared with prior art：
1, the present invention based on coal dust distribution adjustment, supplemented by Secondary Air distribution in a manner of, improve the nearly wall of both walls water-cooling wall
Oxygen content in area's flue gas：The pulverized coal flow close to side wall burner is reduced by adjusting wind powder adjusting apparatus, by adjusting two
Controllable register in secondary bellows, improves the Secondary Air air quantity close to side wall burner, and wind, powder adjustment are combined guarantee close to side wall
Burner excess air coefficient is more than 1, and then effectively improves both walls water-cooling wall near wall region oxygen amount.Simultaneously to the tune of secondary air flow
Section carries out angular adjustment by the baffle being arranged inside secondary air bellow, ensures the interior outer second air eddy flow leaf of each branch burner
Piece adjusts that aperture is identical, to realize being effectively matched for burner air quantity and swirl strength.
2, the present invention assists the setting of fire air nozzle by circle of contact jet stream simultaneously, strengthens the empir-ical formulation in stove, from
And it ensure that the lower smoke-filling movement of screen and flue gas flow field distribution are relatively uniform.
3, combustion optimizing system of the present invention can be installed directly in the existing swirl flow combustion boiler that liquidates, and not influence
Under the premise of the safety of boiler operatiopn and economy, the swirl flow combustion boiler side wall water wall high temperature corrosion that liquidates effectively is solved
Problem.
Description of the drawings
Fig. 1 is structural schematic diagram of the combustion optimizing system of the present invention for the swirl flow combustion boiler that liquidates；
Fig. 2 is dimensional structure diagram of the combustion optimizing system of the present invention for the swirl flow combustion boiler that liquidates；
Fig. 3 is secondary air bellow and the structural schematic diagram of Secondary Air allocation of the amount of air regulating device in Fig. 2；
Fig. 4 is the structural schematic diagram that auxiliary fire air nozzle is in wall circle of contact arrangement in Fig. 2；
Fig. 5 is the structural schematic diagram that auxiliary fire air nozzle is in double circle of contact arrangements in Fig. 2；
Fig. 6 be it is existing liquidate swirl flow combustion boiler water wall near wall region with using the present invention carry out burning optimization adjustment after
Water-cooling wall near wall region flue gas composition profiles versus schemes；
Fig. 7 be flue gas composition distribution in cross section where the burner of the existing swirl flow combustion boiler that liquidates with using the present invention into
Cross section flue gas composition profiles versus figure where burner after the adjustment of row burning optimization；
Fig. 8 is that the screen bottom section of burner hearth flue-gas temperature distribution of the existing swirl flow combustion boiler that liquidates is fired with using the present invention
Burn the screen bottom section of burner hearth flue-gas temperature profiles versus figure after optimizing and revising.
In figure, 1- burner hearths, 2- upper furnace horizontal flues, 3- vertical well gas flues, 4- economizer exit flues, 5- screen formulas overheat
Device, 6- high temperature superheaters, 7- high temperature reheaters, 8- low temperature superheaters, 9- low-temperature reheaters, 10- economizers, 11- burners,
11a- intermediate combustion devices, the both ends 11b- burner, 12- secondary air bellows, 13- burnout degrees（OFA）Spout, 14- coal pulverizers, 15-
First air pulverized coal channel, 16- wind powder regulating devices, 17- wind powder measuring devices, 18- water-cooling wall near wall region flue gas compositions measure dress
It sets, 19- section of burner hearth temperature field measuring apparatus, 20- economizer exit Oxygen Amount in Flue Gas field measurement devices, 21- Secondary Air air quantity point
With regulating device, 21a- baffle arrangements, 22- assists fire air nozzle, 23- to assist burnout degree bellows.
In Fig. 6, Fig. 7, Fig. 8, before the adjustment of a- burning optimizations, after the adjustment of b- burning optimizations.
Specific implementation mode
The present invention is described in detail below in conjunction with the accompanying drawings.
As shown in Figure 1 and Figure 2, the present embodiment carry out burning optimization object be a 660MW ultra supercritical liquidate eddy flow combustion
Burning boiler, the swirl flow combustion boiler that liquidates include burner hearth 1, burner 11, pendant superheater 5, high temperature superheater 6, high temperature reheating
It is device 7, low temperature superheater 8, low-temperature reheater 9, economizer 10, secondary air bellow 12, fire air nozzle 13, coal pulverizer 14, primary
Wind pulverized coal channel 15.Burner hearth 1 is made of front wall, rear wall and both walls water-cooling wall, and 3 layers of upper, middle and lower are respectively arranged in forward and backward wall
Burner, every layer of 6 burner, totally 36 burners, every layer of burner 11 are co-located in a secondary air bellow 12.Boiler is matched
Standby 6 coal pulverizers 14, every coal pulverizer supply coal dust to one layer of burner 11.When operation, the broken coal dust of every coal pulverizer 14
It is sent into each corresponding burner of same layer by 6 First air pulverized coal channels 15.One layer of burnout degree is installed respectively on forward and backward wall
Spout 13, position is above top layer's burner.
Combustion optimizing system of the present invention includes control unit（It is not drawn into）, wind powder regulating device 16, Secondary Air allocation of the amount of air
Regulating device 21, auxiliary fire air nozzle 22, wind powder measuring device 17, water-cooling wall near wall region flue gas composition measuring device 18, stove
Thorax section temperature field measurement device 19, economizer exit Oxygen Amount in Flue Gas field measurement device 20.Specific setting is as follows：It burns at every layer
Installation Secondary Air allocation of the amount of air regulating device 21 in 11 corresponding secondary air bellow 12 of device；It is exported in every coal pulverizer 14 primary
Wind powder regulating device 16 and wind powder measuring device 17 are installed on wind pulverized coal channel 15；Installation is cut at 1 ~ 2m below fire air nozzle
Circular jet assists fire air nozzle 22；Water-cooling wall near wall region flue gas composition is installed in boiler both walls water-wall corrosion critical regions
Measuring device 18；Economizer exit Oxygen Amount in Flue Gas field measurement device 20 is installed on economizer exit flue 4；1 top of burner hearth,
5 lower section installation section of burner hearth temperature field measuring apparatus 19 of pendant superheater.
The OMC that wind powder regulating device 16 is produced using ESSEN Process Industrial Limited (UK) company
Massflow600, for adjusting quality of pc flow rate and First air air quantity in each First air pulverized coal channel 15.Secondary Air air quantity
Distribution regulating device 21 is made of several controllable register structures being symmetrically installed in secondary air bellow 12, the number of baffle arrangement 21a
Amount subtracts 2 to set the quantity of burner in corresponding secondary air bellow 12, and by taking the present embodiment as an example, 6 are equipped in each secondary air bellow 12
A burner 11, including two both ends burner 11b, four intermediate combustion device 11a inside set four baffle arrangement 21a, set respectively
Set the right end in two intermediate combustion devices of left end and right end of two intermediate combustion devices of left end.As shown in figure 3, each baffle arrangement
21a includes three baffles being separately positioned on the different inner walls of secondary air bellow 12, and each baffle is rotated by electric rotation shaft to be arranged
On same section.The interior outer second air swirl vane of each branch burner is adjusted to identical aperture, by adjusting secondary air box
The angle of interior each baffle is adjusted into the secondary air flow of each branch intermediate combustion device 11a, to realize burner air quantity and eddy flow
Intensity is effectively matched.When each baffle for forming baffle arrangement 21a is in an angle of 90 degrees with corresponding inner wall, into burner
Secondary air flow is minimum, at this point, the shielded area that three block baffles merge is the 30 ~ 50% of 12 inner passage section of secondary air bellow.It is preferred that
, each baffle is trapezoidal, and size is：Trapezoidal bottom is secondary air box height/width（I.e. 12 inner wall of secondary air bellow connects with baffle
Connect the length of side at place）80 ~ 90%, upper bottom be bottom 70 ~ 80%, be highly secondary air box height（I.e. with connect side vertical direction
The length of side）10~15%（If 12 section of secondary air bellow is square, then height herein, width are the inner wall section length of side）.
Auxiliary fire air nozzle 22 is connected with burnout degree bellows 23 are assisted, and is designed using fire air nozzle, by adjusting spout air output,
Carry out pendant superheater lower furnace section temperature field control.Assist the arrangement of fire air nozzle 22 as shown in figure 5, the present invention adopts
Shown double circle of contact arrangements can be used in 600MW grades boiler and 1000 MW grades boilers.For 300MW grade boilers
The auxiliary fire air nozzle 22 of wall circle of contact arrangement as shown in Figure 4 can be used.Water-cooling wall near wall region flue gas composition measuring device 18
Using the instrument of German M＆C, for monitoring the O in water-cooling wall near wall region flue gas2, CO and H2S concentration.Economizer exit flue gas oxygen
Field measurement device 20 is measured using Siemens's oxygen amount instrument, the oxygen amount concentration field for monitoring the flue gas after economizer divides
Cloth.Section of burner hearth temperature field measuring apparatus 19 uses acoustic measuring technique, for monitoring section of burner hearth smoke-filling movement.Control is single
Position is PLC configurations, for receiving water-cooling wall near wall region flue gas composition measuring device 18, economizer exit Oxygen Amount in Flue Gas field measurement dress
The signal of 20 and section of burner hearth temperature field measuring apparatus 19 is set, control wind powder regulating device 16, Secondary Air allocation of the amount of air adjust dress
Set 21 and auxiliary fire air nozzle 22.
The burning optimization method of adjustment that this patent proposes is carried out in the state of stable operation of the boiler.Before boiler startup,
The inside and outside Secondary Air blade opening of each layer burner should be adjusted into reasonable value according to burning coal situation, when adjustment ensures same layer combustion
The inside and outside Secondary Air blade opening of burner is consistent.When boiler startup, it should be adjusted by adjusting the wind powder on First air pulverized coal channel 15
Device 16 ensures that each branch burner First air air quantity of same layer is identical with pulverized coal mass flow, to ensure to open the stability of stove.Boiler
It is hot it is stable after, it is close to water-cooling wall using the water-cooling wall near wall region flue gas composition measuring device 18 on boiler side wall
Wall area O2, CO and H2The carry out real-time online measuring of S concentration.
If the O measured2<1.5%, H2S >100ppm, CO>2000ppm, then using on First air pulverized coal channel
Wind powder regulating device 16 continuously decreases the quality of pc flow rate close to side wall burner, utilizes the wind in secondary air box
Amount distribution adjusting apparatus（21）, the Secondary Air air quantity close to side wall burner is gradually increased, until both walls near wall region O2≥
1.5%、H2S≤100ppm、CO≤2000ppm.Specifically adjustment mode is：Each baffle is each in allocation of the amount of air adjusting apparatus 21
Adjusting angle be 5 ~ 10 degree, the amplitude of accommodation of wind powder regulating device 16 is 5 ~ 10 degree, it is each adjust after 5 ~ 10min of stably measured
Afterwards, next adjustment is being carried out.
During the adjustment, section of burner hearth temperature field measuring apparatus 19 He of the moment monitoring mounted on pendant superheater lower part
The measurement result of Oxygen Amount in Flue Gas field measurement device 20 on economizer exit flue, and pay close attention to superheater and reheater two
The deviation situation of side temperature adjusts the outlet air quantity of circle of contact jet stream auxiliary fire air nozzle 22 and fire air nozzle 13, protects in time
Card pendant superheater lower furnace cross-section temperature field is uniform, and economizer exit Oxygen Amount in Flue Gas field is uniform, superheater and reheater heat
Deviation and spray water flux are in scope of design.Auxiliary fire air nozzle specific adjustment mode be：If section of burner hearth flue-gas temperature
Low, low among the appearance of oxygen content at economizer outlet field, both sides the are high distribution characteristics in the intermediate height of field appearance, both sides, increasing, which increases, to assist firing
Wind air quantity, reduction burnout degree air quantity to the greatest extent；If there is opposite distribution characteristics, reduces auxiliary burnout degree air quantity, increase burnout degree
Air quantity.
Following table gives the situation of change for optimizing and revising front and back boiler leading indicator, in table it can be seen from optimization adjust
It is compared before whole, water cooling is than near wall region O2Concentration dramatically increases, CO and H2S concentration significantly reduces, superheater and reheater spray water flux
There is no significant changes, in scope of design.Before and after adjustment, superheater and reheater Temperature Deviation are basically unchanged.
| Project | Before optimizing and revising | After optimizing and revising |
| Water-cooling wall near wall region O2（%） | 0/0/0 | 3.2/1.7/2.4 |
| Water-cooling wall near wall region CO（ppm） | >20000 | 1800/1760/1278 |
| Water-cooling wall near wall region H2S（ppm） | >500 | 32/51/27 |
| Desuperheating water of superheater amount（t/h） | 31.5 | 53.2 |
| Reheater spray water flux（t/h） | 4.61 | 0 |
| Superheater steam temperature thermal deviation（oC） | 4 | 3 |
| Reheater steam temperature thermal deviation（oC） | 3 | 4 |
| Boiler efficiency（%） | 93.21 | 93.33 |
In order to further illustrate the effect of the present embodiment, the operation side of the present embodiment is analyzed using the method for numerical simulation
Combustion case in formula stove.Fig. 6, Fig. 7 and Fig. 8, which give, optimizes and revises front and back, the nearly wall of side water wall using the art of this patent
The variation of area's oxygen amount, hearth combustor layer cross section oxygen amount field and pendant superheater temperature of lower field.As can be seen from Figure, with it is excellent
It is compared before changing adjustment, water-cooling wall near wall region oxygen amount dramatically increases, and the oxygen amount of most areas is higher than 1.5%（Figure intermediate value is
0.015）.Oxygen amount can effectively prevent water in intermediate low, high close to surrounding water cooling wall region feature on hearth combustor layer cross section
Cooling wall high-temperature corrosion.Pendant superheater lower furnace cross-section temperature field is preceding almost the same with adjustment, this shows burner using this
The coal dust and the Secondary Air method of salary distribution that patent proposes do not cause superheater area temperature field to glance off, are uneven.
Claims (7)
1. a kind of method for preventing the burning optimization of water wall high temperature corrosion from adjusting, it is characterised in that：This method is excellent using burning
Change system carries out burning optimization adjustment；The combustion optimizing system includes wind powder adjusting apparatus, Secondary Air allocation of the amount of air adjusting dress
It sets, water-cooling wall near wall region flue gas composition measuring device, assist fire air nozzle, temperature field measuring apparatus and economizer exit flue gas
Oxygen amount field measurement device；The wind powder adjusting apparatus is multiple, and each burner to liquidate in swirl flow combustion boiler is corresponding primary
Corresponding wind powder adjusting apparatus is respectively equipped on wind pulverized coal channel；The secondary air flow distribution regulating device is multiple, and liquidate rotation
Corresponding secondary air flow distribution regulating device is respectively equipped in each secondary air bellow in stream burning boiler；Each secondary air flow point
Include multiple baffle arrangements with regulating device, each baffle arrangement adjustable angle saves land in corresponding secondary air bellow；Institute
It is two to state water-cooling wall near wall region flue gas composition measuring device, the both walls water for the swirl flow combustion boiler furnace that is separately mounted to liquidate
At cold wall；The auxiliary fire air nozzle is multiple, is separately positioned in the swirl flow combustion boiler that liquidates below fire air nozzle；Institute
Temperature field measuring apparatus is stated in burner hearth, below pendant superheater；The economizer exit Oxygen Amount in Flue Gas field measurement device is set
At economizer exit flue；The burning optimization method of adjustment passes through the water-cooling wall near wall region flue gas composition measuring device pair
Water-cooling wall near wall region O2, CO and H2S concentration is measured in real time, and regulating device is distributed by wind powder adjusting apparatus and secondary air flow
Regulation and control enter quality of pc flow rate and Secondary Air air quantity in each burner respectively, make to be located at each in the same secondary air bellow
Burner quality of pc distribution of flow rate is gradually reduced by centre to both sides, Secondary Air air quantity is gradually increased by centre to both sides, and
Make water-cooling wall near wall region O2, CO and H2S concentration meets simultaneously：O2≥1.5%、H2S≤100ppm、CO≤2000ppm；Pass through temperature
The temperature field for spending field measurement device monitoring pendant superheater lower furnace section, is filled by economizer exit Oxygen Amount in Flue Gas field measurement
The oxygen amount field of monitoring economizer exit flue, control fire air nozzle and the outlet air quantity for assisting fire air nozzle are set, screen formula is made
The Oxygen Amount in Flue Gas field of the uniform temperature fields in superheater lower furnace section, the oxygen amount field of economizer exit flue is uniform.
2. the method for burning optimization adjustment according to claim 1, it is characterised in that：It is formed in the combustion optimizing system every
The baffle arrangement quantity of a secondary air flow distribution regulating device is that corresponding secondary air bellow inner burner quantity subtracts 2；It is described secondary
The burner being equipped in wind bellows is divided into both ends burner and intermediate combustion device；The both ends burner is two, is located at
The both ends inlet of secondary air bellow；The intermediate combustion device is located among two both ends burners；Each baffle arrangement is set respectively
In the air intake vent end of corresponding intermediate combustion device；The burning optimization method of adjustment passes through the water-cooling wall near wall region flue gas composition
Measuring device is to water-cooling wall near wall region O2, CO and H2S concentration is measured in real time, passes through wind powder adjusting apparatus and secondary air flow point
Regulate and control to enter quality of pc flow rate and Secondary Air air quantity in each burner respectively with regulating device, makes to be located at the same Secondary Air
Each burner quality of pc distribution of flow rate in bellows is gradually reduced by centre to both sides, Secondary Air air quantity by centre to both sides by
It is cumulative to add, and make water-cooling wall near wall region O2, CO and H2S concentration meets simultaneously：O2≥1.5%、H2S≤100ppm、CO≤
2000ppm；The temperature field that pendant superheater lower furnace section is monitored by temperature field measuring apparatus, passes through economizer exit cigarette
Gas oxygen amount field measurement device monitors the oxygen amount field of economizer exit flue, and control fire air nozzle goes out with auxiliary fire air nozzle
One's intention as revealed in what one says amount makes the uniform temperature fields in pendant superheater lower furnace section, the Oxygen Amount in Flue Gas of the oxygen amount field of economizer exit flue
Field is uniformly；As the water-cooling wall near wall region O that the flue gas composition measuring device measures2, CO and H2S real-time concentrations：O2＜ 1.5%, H2S
When ＞ 100ppm or CO ＞ 2000ppm, the specific regulative mode of the wind powder adjusting apparatus and secondary air flow distribution regulating device
For：Increase the angle of the baffle arrangement and bellows inner wall of the Secondary Air allocation of the amount of air regulating device by two close end burner, improves
The Secondary Air intake of both ends burner, reduction both ends burner correspond to the wind powder regulating device on First air pulverized coal channel and open
Degree reduces the quality of pc flow rate of both ends burner.
3. burning optimization method of adjustment according to claim 2, it is characterised in that：Include the following steps：
（1）Before boiler startup, the inside and outside Secondary Air blade opening of each burner is adjusted, and makes to be located in the same secondary air bellow
The inside and outside Secondary Air blade opening of each burner it is consistent；When boiler startup, the wind powder adjustment dress on First air pulverized coal channel is adjusted
It sets, keeps each burner First air air quantity being located in the same secondary air bellow identical with pulverized coal flow；
（2）After boiler thermal-state is stable, the water-cooling wall near wall region O that is detected by flue gas composition measuring device2, CO and H2S is real
When concentration, be sent to the control system, wind powder adjusting apparatus and secondary air flow distribution regulating device point controlled by control system
The quality of pc flow rate and Secondary Air air quantity in each burner Tiao Kong not entered, make water-cooling wall near wall region O2, CO and H2S concentration is same
When meet：O2≥1.5%、H2S≤100ppm、CO≤2000ppm；When the nearly wall of water-cooling wall that the flue gas composition measuring device measures
Area O2, CO and H2S real-time concentrations：O2＜ 1.5%, H2When S ＞ 100ppm or CO ＞ 2000ppm, the wind powder adjusting apparatus and two
The specific regulative mode of secondary allocation of the amount of air regulating device is：Increase the Secondary Air allocation of the amount of air regulating device by two close end burner
Baffle arrangement and bellows inner wall angle, improve both ends burner Secondary Air intake, reduce both ends burner correspond to one
Wind powder regulating device aperture on secondary wind pulverized coal channel reduces the quality of pc flow rate of both ends burner；Allocation of the amount of air adjustment dress
The each adjusting angle of each baffle is 5 ~ 10 degree in setting, and the amplitude of accommodation of wind powder regulating device is 5 ~ 10 degree, steady after adjustment every time
After 5 ~ 10min of location survey amount, then carry out next adjustment；
（3）The temperature field for monitoring pendant superheater lower furnace section by temperature field measuring apparatus simultaneously, passes through Oxygen Amount in Flue Gas
Field measurement device monitors the oxygen amount field of economizer exit flue, and monitoring data are sent to the control system, is by control
System control fire air nozzle and the outlet air quantity for assisting fire air nozzle, keep the temperature field in pendant superheater lower furnace section equal
Even, the Oxygen Amount in Flue Gas field of the oxygen amount field of economizer exit flue is uniform；Specifically adjustment mode is：If section of burner hearth smoke-filling movement
Height, both sides are low among occurring, and intermediate distribution characteristics low, both sides are high occurs in oxygen content at economizer outlet field, then increases auxiliary after-flame
Wind air quantity reduces burnout degree air quantity；If there is opposite distribution characteristics, reduces auxiliary burnout degree air quantity, increase burnout degree wind
Amount.
4. burning optimization method of adjustment according to claim 2, it is characterised in that：The baffle is trapezoidal, goes to the bottom as this
The 80 ~ 90% of baffle and the secondary air bellow inner wall joint length of side, upper bottom be 70 ~ 80% to go to the bottom, highly for the joint length of side
The 10 ~ 15% of the vertical another side length of side.
5. burning optimization method of adjustment according to claim 4, it is characterised in that：When liquidating, swirl flow combustion boiler is
When 300MW grades, the auxiliary fire air nozzle is 4, is arranged in the wall circle of contact；When the swirl flow combustion boiler that liquidates is 600MW
Or when 1000MW grades, the auxiliary fire air nozzle is 8, is arranged in double circle of contacts.
6. burning optimization method of adjustment according to claim 5, it is characterised in that：The auxiliary fire air nozzle is set to combustion
To the greatest extent below wind snout at 1-2m.
7. burning optimization method of adjustment according to claim 6, it is characterised in that：The combustion optimizing system further includes control
Unit processed；Described control unit distributes regulating device, water-cooling wall near wall region cigarette with the wind powder adjusting apparatus, secondary air flow respectively
Gas component measuring device, auxiliary fire air nozzle, temperature field measuring apparatus and economizer exit Oxygen Amount in Flue Gas field measurement device phase
Even.
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Address after: 210023 No. 10 Wonderland Road, Qixia District, Nanjing City, Jiangsu Province Co-patentee after: Guodian Nanjing electric power test & Research Co., Ltd. Patentee after: National Electric Science and Technology Research Institute Co., Ltd. Address before: 210023 No. 10 Wonderland Road, Qixia District, Nanjing City, Jiangsu Province Co-patentee before: Nanjing Power Equipment Quality & Performance Test Center Patentee before: Guodian Science and Technology Research Institute |