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 PDF

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Publication number
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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air
burner
water
flue gas
cooling
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CN106678783A (en
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陈国庆
刘建民
李永生
黄启龙
刘铭媛
时伟
孙俊威
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Guodian Nanjing electric power test & Research Co., Ltd.
Guodian Science and Technology Research Institute Co Ltd
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Nanjing Power Equipment Quality & Performance Test Center
Guodian Science and Technology Research Institute Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00Control systems for steam boilers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00Passages or apertures for delivering secondary air for completing combustion of fuel 
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23MCASINGS, 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
    • F23M5/00Casings; Linings; Walls
    • F23M5/08Cooling thereof; Tube walls
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/003Systems for controlling combustion using detectors sensitive to combustion gas properties

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

A kind of combustion optimizing system and method for adjustment preventing water wall high temperature corrosion
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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