CN106678783A - Combustion optimization system and adjustment method for preventing water wall high-temperature corrosion - Google Patents

Combustion optimization system and adjustment method for preventing water wall high-temperature corrosion Download PDF

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CN106678783A
CN106678783A CN201710104624.1A CN201710104624A CN106678783A CN 106678783 A CN106678783 A CN 106678783A CN 201710104624 A CN201710104624 A CN 201710104624A CN 106678783 A CN106678783 A CN 106678783A
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China
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air
burner
wind
water
adjusting
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CN201710104624.1A
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CN106678783B (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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国电科学技术研究院
南京电力设备质量性能检验中心
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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 provides a combustion optimization system and adjustment method for preventing water wall high-temperature corrosion. The combustion optimization system comprises air and pulverized coal adjustment devices, secondary air distribution adjustment devices, two water wall near wall region smoke component measuring devices, a plurality of auxiliary over fire air nozzles, a temperature field measuring device and a coal economizer outlet smoke oxygen content field measuring device. A first air and pulverized coal pipeline corresponding to each combustor is provided with the corresponding air and pulverized coal adjustment device. Each secondary air box is internally provided with the corresponding secondary air distribution adjustment device. The two water wall near wall region smoke component measuring devices are separately mounted on the water wall on the two sides of a boiler. The multiple auxiliary over fire air nozzles are separately arranged below over fire air nozzles. The temperature field measuring device is arranged on the portion, below a platen overheater, in a hearth. The coal economizer outlet smoke oxygen content field measuring device is arranged at a coal economizer outlet flue. By adoption of the combustion optimization system, high-temperature corrosion to the water wall of the opposite cyclone combustion boiler can be effectively relieved.

Description

A kind of combustion optimizing system and method for adjustment for preventing water wall high temperature corrosion
Technical field
The invention belongs to steam power plant field, and in particular to one kind can effectively prevent opposed firing swirl flow combustion The burning optimization method of adjustment of boiler water-cooling wall high-temperature corrosion and system, are particularly suited 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 the big primary combustion mode of station boiler three, because of combustion apparatus and Advantage in terms of heating surface arrangement, becomes one of combustion system that domestic supercritical and ultra-supercritical boiler are mainly adopted, in state Occupy very big share in interior in-service fired power generating unit.In order to realize efficient, economic, environmentally friendly operation, such type of furnace is generally using sky The mode of gas fractional combustion+low NO controls NOxDischarge.
Though NO can be reduced using strong reducing zone in the stove that low-NO_x combustion technology is formedxDischarge, but to the safety of boiler Operation brings some row problems.First, a large amount of severe corrosive gases, such as H are contained in the gas of reducing zone2S.The gas is in certain bar The ferrum oxide protecting film of water-cooled wall surface is highly vulnerable to breakage under part, it is rotten so as to cause water-cooling wall serious sulfide type high temperature occur Erosion.Secondly, Deoxidation Atmosphere in Furnace strengthens, and the grey melt temperature of coal also will be greatly lowered, and 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 reduce NOxDischarge capacity, constantly strengthens the degree of air classification, reduces primary zone and reducing zone oxygen amount, increases burnout degree Ratio, but the way causes water wall high temperature corrosion problem more to project.Water-cooling wall occurs after high temperature corrosion, wall thickness reduction, by force Degree is reduced, and booster easily occurs, and causes that unit is non-to stop, it has also become puzzlement Chinese large-sized coal-fired power station boiler particularly liquidates eddy flow Burning boiler is using the obstinate disease after low-NO_x combustion technology.
For swirl flow combustion boiler is rushed, because combustion method and chamber structure are special in stove, water-cooling wall high temperature Corrosion is occurred mainly on the left and right sides wall of primary zone and reducing zone.In order to alleviate or solving the swirl flow combustion boiler both sides that liquidate Wall water wall high temperature corrosion, the method commonly used at present mainly has following several:
1st, water-cooling wall surface spraying is processed.Anticorrosion with painting process is carried out to water-cooled wall surface using corrosion-resistant material.At present, should Technology is most widely used, but exist it is costly, protection cycle is short the problems such as, it is impossible to fundamentally solve water wall high temperature corrosion Problem.
2nd, adherent wind transformation is implemented.In water wall high temperature corrosion critical regions by perforate or setting spout, by a small amount of two Secondary wind sends into burner hearth, it is ensured that the air sent in burner hearth flows along wall, so as to improve water-cooling wall near wall region oxygen amount, prevents water The generation of cooling wall high-temperature corrosion.But show from the operation result of retrofitted unit, side water wall perforate or setting spout are simultaneously Stable wind film cannot be formed in water-cooled wall surface, it is limited to the protective action of water wall high temperature corrosion, and affect boiler combustion Efficiency, discharged nitrous oxides concentration, or even cause coke heavy in stove.
3rd, burning optimization adjustment.By optimizing and revising in operation, improve oxygen in both walls water-cooling wall near wall region flue gas and contain Amount, so as to the generation for preventing high temperature corrosion from reacting.At present, Thermal generation unit boiler combustion optimization adjustment 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 finds there is problems with through actual motion:
(1)The effect for improving both walls water-cooling wall near wall region oxygen amount is not obvious.Jing lot of experiments and actual motion find, test Middle intermediate combustion device secondary wind air door to be closed to 15 ~ 20%, near side wall burner secondary air register standard-sized sheet, both walls water-cooling wall is near Wall area oxygen amount is slightly raised, but in actual motion, the too small operation of burner secondary wind throttle opening adjustment is existed into safety hidden Suffer from, by the excessive impact coal powder ignition of burner secondary wind throttle opening adjustment and after-flame, air distribution optimizes and revises raising both walls water The effect of cold wall near wall region oxygen amount is not obvious.
(2)Air quantity cannot be effectively matched with swirl strength, affect efficiency of combustion and stability.The swirl flow combustion boiler that liquidates is adopted Burner is turbulent burner.The burner is forming recirculating zone volume suction height by swirl vane at a certain distance from spout Warm flue gas firing coal-dust, with extremely strong steady combustion characteristic.Swirl vane is also simultaneously the wind for controlling burner secondary wind intake 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 Catch fire in time in coal dust, affect coal dust after-flame.Though the burner throttle of zone line is too small to reduce air quantity, eddy flow is increased Intensity, can cause to catch fire in advance, the problems such as 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 extreme difference, using non-uniform air distribution burning the skewness of temperature field in furnace and flue gas flow field is inevitably resulted in, it is this it is uneven from Primary zone can be extended to always economizer exit, thus cause to shield, exceed, the high heating surface such as again is heated inequality, exist it is hot partially Difference, and then cause attemperation water flow to increase, unit economy declines.
The content of the invention
The invention aims to solve defect present in prior art, there is provided one kind can effectively alleviate water-cooling wall The combustion optimizing system of high temperature corrosion.
In order to achieve the above object, the invention provides a kind of combustion optimizing system for preventing water wall high temperature corrosion, should Combustion optimizing system is used for the swirl flow combustion boiler that liquidates;Including wind powder adjusting apparatus, secondary wind allocation of the amount of air adjusting means, water-cooled Wall near wall region flue gas composition measurement apparatus, auxiliary fire air nozzle, temperature field measuring apparatus and economizer exit Oxygen Amount in Flue Gas field Measurement apparatus;Wind powder adjusting apparatus are multiple, the corresponding First air pulverized coal channel of each burner liquidated in swirl flow combustion boiler On be respectively equipped with corresponding wind powder adjusting apparatus;Secondary air flow distribution adjusting means is multiple, is liquidated in swirl flow combustion boiler Corresponding secondary air flow distribution adjusting means is respectively equipped with each secondary air bellow;Each secondary air flow distribution adjusting means 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 measurement apparatus are two, at the both walls water-cooling wall of the swirl flow combustion boiler furnace that is separately mounted to liquidate;Auxiliary burnout degree Spout is multiple, is separately positioned on fire air nozzle lower section in the swirl flow combustion boiler that liquidates;Temperature field measuring apparatus are located at burner hearth Interior, pendant superheater lower section;Economizer exit Oxygen Amount in Flue Gas field measurement device is at economizer exit flue.
The baffle arrangement quantity for constituting each secondary air flow distribution adjusting means is correspondence secondary air bellow inner burner number Amount subtracts 2;The burner being provided with secondary air bellow is divided into two ends burner and intermediate combustion device;Two ends burner is two, point Not Wei Yu secondary air bellow two ends porch;Intermediate combustion device is located in the middle of two two ends burners;Each baffle arrangement difference Located at the air intake vent end of corresponding intermediate combustion device.
Wherein, each baffle arrangement includes three pieces of baffle plates, is rotatably arranged in secondary wind wind by electric rotation shaft respectively At the corresponding different inwalls of case, and three electric rotation shafts are located on same longitudinal section;When baffle arrangement three pieces of baffle plates with it is corresponding Inwall when being in 90 degree, the shielded area of baffle arrangement is the 30 ~ 50% of secondary air bellow longitudinal section area.
Baffle plate is trapezoidal, goes to the bottom as the 80 ~ 90% of the baffle plate and the secondary air bellow inwall joint length of side, and upper bottom is to go to the bottom 70 ~ 80%, be highly the 10 ~ 15% of 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, in wall circle of contact arrangement;When When the swirl flow combustion boiler that liquidates is 600MW or 1000MW grades, auxiliary fire air nozzle is 8, in double circle of contacts arrangement.
Auxiliary fire air nozzle is at the 1-2m of fire air nozzle lower section.
Combustion optimizing system of the present invention also includes control unit;Control unit respectively with wind powder adjusting apparatus, secondary air flow Distribution adjusting means, water-cooling wall near wall region flue gas composition measurement apparatus, auxiliary fire air nozzle, temperature field measuring apparatus and province's coal Device exiting flue gas oxygen amount field measurement device is connected.
Present invention also offers the method for carrying out burning optimization adjustment using above-mentioned combustion optimizing system, the method is by institute Water-cooling wall near wall region flue gas composition measurement apparatus are stated to water-cooling wall near wall region O2, CO and H2S concentration is measured in real time, by wind Powder adjusting apparatus and secondary air flow distribution adjusting means regulate and control respectively into the quality of pc flow rate and secondary wind in each burner Air quantity, each burner quality of pc distribution of flow rate being located in same secondary air bellow is gradually reduced by centre to both sides, Secondary wind air quantity is gradually increased by centre to both sides, and causes 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 Degree field, by economizer exit Oxygen Amount in Flue Gas field measurement device the oxygen amount field of economizer exit flue, control burnout degree spray are monitored 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 measurement apparatus are measured2, CO and H2S real-time concentrations:O2< 1.5%, H2During S > 100ppm or CO > 2000ppm, the concrete regulative mode of wind powder adjusting apparatus and secondary air flow distribution adjusting means For:Increase the baffle arrangement and the angle of bellows inwall of the secondary wind allocation of the amount of air adjusting means of close two ends burner, improve The secondary wind intake of two ends burner, the wind powder adjusting means reduced on two ends burner correspondence First air pulverized coal channel is opened Degree, reduces the quality of pc flow rate of two ends burner.
Burning optimization method of adjustment of the present invention, comprises the following steps that:
(1)Before boiler startup, the inside and outside secondary wind blade opening of each burner is adjusted, and make to be located in same secondary air bellow The inside and outside secondary wind blade opening of each burner it is consistent;During boiler startup, the wind powder adjustment dress on First air pulverized coal channel is adjusted Put, make each burner First air air quantity being located in same secondary air bellow identical with pulverized coal flow;
(2)After boiler thermal-state is stable, the water-cooling wall near wall region O detected by flue gas composition measurement apparatus2, CO and H2S Real-time concentration, is sent to the control system, and by control system wind powder adjusting apparatus and secondary air flow distribution adjusting means are controlled Regulation and control respectively make water-cooling wall near wall region O into quality of pc flow rate and secondary wind air quantity in each burner2, CO and H2S concentration Meet simultaneously:O2≥1.5%、H2S≤100ppm、CO≤2000ppm;When the water-cooling wall that the flue gas composition measurement apparatus are measured it is near Wall area O2, CO and H2S real-time concentrations:O2< 1.5%, H2During S > 100ppm or CO > 2000ppm, the wind powder adjusting apparatus and Secondary air flow distributes the concrete regulative mode of adjusting means:Increase the secondary wind allocation of the amount of air regulation dress near two ends burner The baffle arrangement put and the angle of bellows inwall, improve the secondary wind intake of two ends burner, reduce two ends burner correspondence Wind powder adjusting means aperture on First air pulverized coal channel, reduces the quality of pc flow rate of two ends burner;Allocation of the amount of air is adjusted The each regulation angle of each baffle plate is 5 ~ 10 degree in device, and the amplitude of accommodation of wind powder adjusting means is 5 ~ 10 degree, every time after adjustment After 5 ~ 10min of stably measured, then carry out next adjustment;
(3)The temperature field in pendant superheater lower furnace section is monitored by temperature field measuring apparatus simultaneously, by Oxygen Amount in Flue Gas Field measurement device monitors the oxygen amount field of economizer exit flue, and Monitoring Data is sent to into the control system, by control system The outlet air quantity of system control fire air nozzle and auxiliary fire air nozzle, makes 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 High, both sides are low in the middle of occurring, and the high distribution characteristicss in middle low, both sides occurs in oxygen content at economizer outlet field, then increase auxiliary after-flame Wind air quantity, reduction burnout degree air quantity;If there are contrary distribution characteristicss, reduce auxiliary burnout degree air quantity, increase burnout degree wind Amount.
The present invention has compared to existing technology advantages below:
1st, it is of the invention based on coal dust distribution adjustment, in the way of supplemented by secondary wind distribution, raising both walls water-cooling wall near wall region cigarette Oxygen content in gas:The pulverized coal flow of close side wall burner is reduced by adjusting wind powder adjusting apparatus, by adjusting secondary wind Controllable register in case, improves the secondary wind air quantity near side wall burner, and wind, powder adjustment combine guarantee near side wall burning Device excess air coefficient is more than 1, and then effectively improves both walls water-cooling wall near wall region oxygen amount.Regulation to secondary air flow simultaneously is led to Crossing the baffle plate being arranged on inside secondary air bellow carries out angular adjustment, it is ensured that the interior outer second air swirl vane of each burner is adjusted Whole aperture is identical, it is achieved thereby that burner air quantity and swirl strength are effectively matched.
2nd, the present invention aids in the setting of fire air nozzle by circle of contact jet simultaneously, strengthens the empir-ical formulation in stove, from And ensure that the lower smoke-filling movement of screen and flue gas flow field distribution are relatively uniform.
3rd, combustion optimizing system of the present invention can be installed directly in the existing swirl flow combustion boiler that liquidates, and not affected On the premise of the safety of boiler operatiopn and economy, effectively solving liquidates swirl flow combustion boiler side wall water wall high temperature corrosion Problem.
Description of the drawings
Fig. 1 is structural representation 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 the structural representation of secondary air bellow and secondary wind allocation of the amount of air adjusting means in Fig. 2;
Fig. 4 is that structural representation of the fire air nozzle in wall circle of contact arrangement is aided in Fig. 2;
Fig. 5 is that structural representation of the fire air nozzle in double circle of contact arrangements is aided in Fig. 2;
Fig. 6 is that the existing swirl flow combustion boiler water wall near wall region that liquidates carries out the water-cooled after burning optimization adjustment with using the present invention Wall near wall region flue gas composition profiles versus scheme;
Fig. 7 is that the burner place cross section flue gas composition of the existing swirl flow combustion boiler that liquidates is distributed and is fired using the present invention Burner place cross section flue gas composition profiles versus after burning is optimized and revised scheme;
Fig. 8 be the existing swirl flow combustion boiler that liquidates the distribution of screen bottom section of burner hearth flue-gas temperature with carry out burning using the present invention it is excellent Change the screen bottom section of burner hearth flue-gas temperature profiles versus' figure after adjustment.
In figure, 1- burner hearths, 2- upper furnace horizontal flues, 3- vertical well gas flues, 4- economizer exit flues, 5- screen formulas are overheated 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, 11b- two ends burner, 12- secondary air bellows, 13- burnout degrees(OFA)Spout, 14- coal pulverizers, 15- First air pulverized coal channel, 16- wind powder adjusting meanss, 17- wind powder measurement apparatus, 18- water-cooling wall near wall regions flue gas composition measurement dress Put, 19- section of burner hearth temperature field measuring apparatus, 20- economizer exit Oxygen Amount in Flue Gas field measurement devices, 21- secondary wind air quantity point With adjusting means, 21a- baffle arrangements, 22- auxiliary fire air nozzles, 23- auxiliary 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 embodiment
Below in conjunction with the accompanying drawings the present invention is described in detail.
As shown in Figure 1 and Figure 2, the object that the present embodiment carries out burning optimization is that 660MW ultra supercritical liquidates eddy flow combustion Burning boiler, the swirl flow combustion boiler that liquidates is including burner hearth 1, burner 11, pendant superheater 5, high temperature superheater 6, high temperature reheating Device 7, low temperature superheater 8, low-temperature reheater 9, economizer 10, secondary air bellow 12, fire air nozzle 13, coal pulverizer 14, once Wind pulverized coal channel 15.Burner hearth 1 is made up of front wall, rear wall and both walls water-cooling wall, and in forward and backward wall 3 layers of upper, middle and lower are respectively arranged Burner, per layer of 6 burner, totally 36 burners, every layer of burner 11 is co-located in a secondary air bellow 12.Boiler is matched somebody with somebody Standby 6 coal pulverizers 14, every coal pulverizer is to one layer of supply coal dust of burner 11.During operation, the broken coal dust of every coal pulverizer 14 Each corresponding burner of same layer is sent into through 6 First air pulverized coal channels 15.One layer of burnout degree is respectively mounted on forward and backward wall Spout 13, position is above the superiors' burner.
Combustion optimizing system of the present invention includes control unit(It is not drawn into), wind powder adjusting means 16, secondary wind allocation of the amount of air Adjusting means 21, auxiliary fire air nozzle 22, wind powder measurement apparatus 17, water-cooling wall near wall region flue gas composition measurement apparatus 18, stove Thorax section temperature field measurement device 19, economizer exit Oxygen Amount in Flue Gas field measurement device 20.It is concrete to arrange as follows:In per layer of burning Secondary wind allocation of the amount of air adjusting means 21 is installed in the corresponding secondary air bellow 12 of device 11;Export once in every coal pulverizer 14 Wind powder adjusting means 16 and wind powder measurement apparatus 17 are installed on wind pulverized coal channel 15;The installation at 1 ~ 2m below fire air nozzle is cut Circular jet aids in fire air nozzle 22;Water-cooling wall near wall region flue gas composition is installed in boiler both walls water-wall corrosion critical regions Measurement apparatus 18;Economizer exit Oxygen Amount in Flue Gas field measurement device 20 is installed on economizer exit flue 4;The top of burner hearth 1, The lower section of pendant superheater 5 is installed by section of burner hearth temperature field measuring apparatus 19.
The OMC that wind powder adjusting means 16 is produced using ESSEN Process Industrial Limited (UK) companies Massflow600, for adjusting quality of pc flow rate and First air air quantity in each First air pulverized coal channel 15.Secondary wind air quantity Distribution adjusting means 21 is made up of some controllable register structures being symmetrically installed in secondary air bellow 12, the number of baffle arrangement 21a Measure the quantity to set burner in correspondence secondary air bellow 12 and subtract 2, by taking the present embodiment as an example, in each secondary air bellow 12 6 are provided with Individual burner 11, including two two ends burner 11b, four intermediate combustion device 11a inside set four baffle arrangement 21a, set respectively Put the right-hand member of the two intermediate combustion devices of left end and right-hand member in two intermediate combustion devices of left end.As shown in figure 3, each baffle arrangement 21a includes three baffle plates being separately positioned on the different inwalls of secondary air bellow 12, and each baffle plate is rotated by electric rotation shaft and arranged On same section.The interior outer second air swirl vane of each burner is adjusted to into identical aperture, by adjusting secondary air box The angle of interior each baffle plate, is adjusted into the secondary air flow of each intermediate combustion device 11a, so as to realize burner air quantity and eddy flow Intensity is effectively matched.When each baffle plate for constituting baffle arrangement 21a is in an angle of 90 degrees with corresponding inwall, in burner Secondary air flow is minimum, and now, the shielded area of three pieces of baffle plate merging is the 30 ~ 50% of the inner passage section of secondary air bellow 12.It is preferred that , each baffle plate is trapezoidal, and size is:It is trapezoidal to go to the bottom as secondary air box height/width(I.e. the inwall of secondary air bellow 12 connects with baffle plate Connect the length of side at place)80 ~ 90%, upper bottom is 70 ~ 80% for going to the bottom, highly be secondary air box height(I.e. be connected side vertical direction The length of side)10~15%(If the section of secondary air bellow 12 is square, then height herein, width are the inner wall section length of side). Auxiliary fire air nozzle 22 is connected with auxiliary burnout degree bellows 23, is designed using fire air nozzle, by adjusting spout air output, Carry out pendant superheater lower furnace section temperature field control.The arrangement of auxiliary fire air nozzle 22 is as shown in figure 5, the present invention is adopted 600MW grade boilers, and 1000 MW grades boilers can be using shown pair of circle of contact arrangement.For 300MW grade boilers The auxiliary fire air nozzle 22 of the wall circle of contact as shown in Figure 4 arrangement can be adopted.Water-cooling wall near wall region flue gas composition measurement apparatus 18 Using the instrument of German M&C, for monitoring water-cooling wall near wall region flue gas in O2, CO and H2S concentration.Economizer exit flue gas oxygen Amount field measurement device 20 uses Siemens's oxygen amount instrument, for the oxygen amount concentration field point of monitoring flue gas after economizer Cloth.Section of burner hearth temperature field measuring apparatus 19 adopt 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 measurement apparatus 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 put, control wind powder adjusting means 16, secondary wind allocation of the amount of air adjusts dress Put 21 and auxiliary fire air nozzle 22.
The burning optimization method of adjustment that this patent is proposed is carried out in the state of stable operation of the boiler.Before boiler startup, The inside and outside secondary wind blade opening of each layer burner should be adjusted by reasonable value according to burning coal situation, ensure to be fired with layer during adjustment The inside and outside secondary wind blade opening of burner is consistent.During boiler startup, the wind powder that should pass through on adjustment First air pulverized coal channel 15 is adjusted Device 16 ensures identical with pulverized coal mass flow with each burner First air air quantity of layer, to ensure to open the stability of stove.Boiler It is hot it is stable after, it is near to water-cooling wall using the water-cooling wall near wall region flue gas composition measurement apparatus 18 on the boiler side wall Wall area O2, CO and H2S concentration carries out real-time online measuring.
If the O for measuring2<1.5%, H2S >100ppm, CO>2000ppm, then using on First air pulverized coal channel Wind powder adjusting means 16, is gradually lowered the quality of pc flow rate near side wall burner, using the wind in secondary air box Amount distribution adjusting apparatus(21), the secondary wind air quantity near side wall burner is gradually stepped up, until both walls near wall region O2≥ 1.5%、H2S≤100ppm、CO≤2000ppm.Specifically adjustment mode is:Each baffle plate is each in allocation of the amount of air adjusting apparatus 21 Regulation angle be 5 ~ 10 degree, the amplitude of accommodation of wind powder adjusting means 16 is 5 ~ 10 degree, it is each adjust after 5 ~ 10min of stably measured Afterwards, next adjustment is being carried out.
It is in course of adjustment, section of burner hearth temperature field measuring apparatus 19 He of the moment monitoring installed in pendant superheater bottom The measurement result of the 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, in time the outlet air quantity of adjustment circle of contact jet auxiliary fire air nozzle 22 and fire air nozzle 13, protects Card pendant superheater lower furnace cross-section temperature field is uniform, and economizer exit Oxygen Amount in Flue Gas field is uniform, and superheater and reheater are warm Deviation and spray water flux are in scope of design.Auxiliary fire air nozzle concrete adjustment mode be:If section of burner hearth flue-gas temperature High, both sides are low in the middle of the appearance of field, and the high distribution characteristicss in middle low, both sides occurs in oxygen content at economizer outlet field, and increasing increases auxiliary combustion Most wind air quantity, reduction burnout degree air quantity;If there are contrary distribution characteristicss, reduce auxiliary burnout degree air quantity, increase burnout degree Air quantity.
Following table gives the situation of change for optimizing and revising before and after boiler leading indicator, is adjusted with optimization by can be seen that in table Compare before whole, water-cooled is than near wall region O2Concentration is dramatically increased, CO and H2S concentration is significantly reduced, superheater and reheater spray water flux Without 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 are given before and after being optimized and revised using the art of this patent, the nearly wall of side water wall The change 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 Change and compared before adjustment, water-cooling wall near wall region oxygen amount is dramatically increased, the oxygen amount of most areas is higher than 1.5%(Figure intermediate value is 0.015).Oxygen amount is in middle low on hearth combustor layer cross section, near surrounding water-cooled wall region it is high the characteristics of, can effectively prevent water Cooling wall high-temperature corrosion.Pendant superheater lower furnace cross-section temperature field is front with adjustment basically identical, and this shows burner using this The coal dust and the secondary wind method of salary distribution that patent is proposed does not cause superheater area temperature field to glance off, inequality.

Claims (10)

1. a kind of combustion optimizing system for preventing water wall high temperature corrosion, it is characterised in that:Including wind powder adjusting apparatus, secondary wind Allocation of the amount of air adjusting means, water-cooling wall near wall region flue gas composition measurement apparatus, auxiliary fire air nozzle, temperature field measuring apparatus and Economizer exit Oxygen Amount in Flue Gas field measurement device;The wind powder adjusting apparatus are multiple, each combustion liquidated in swirl flow combustion boiler Corresponding wind powder adjusting apparatus are respectively equipped with the corresponding First air pulverized coal channel of burner;The secondary air flow distributes adjusting means For multiple, corresponding secondary air flow distribution adjusting means is respectively equipped with each secondary air bellow in swirl flow combustion boiler that liquidates; Each secondary air flow distribution adjusting means includes multiple baffle arrangements, and each baffle arrangement adjustable angle saves land located at corresponding two In secondary wind bellows;The water-cooling wall near wall region flue gas composition measurement apparatus are two, are separately mounted to the swirl flow combustion boiler that liquidates At the both walls water-cooling wall of burner hearth;The auxiliary fire air nozzle is multiple, is separately positioned on the swirl flow combustion boiler internal combustion that liquidates To the greatest extent below wind snout;The temperature field measuring apparatus are in burner hearth, pendant superheater lower section;The economizer exit flue gas oxygen Amount field measurement device is at economizer exit flue.
2. combustion optimizing system according to claim 1, it is characterised in that:Constitute each secondary air flow distribution adjusting means Baffle arrangement quantity for correspondence secondary air bellow inner burner quantity subtract 2;The burner being provided with the secondary air bellow point For two ends burner and intermediate combustion device;The two ends burner is two, respectively positioned at the two ends porch of secondary air bellow; The intermediate combustion device is located in the middle of two two ends burners;Each baffle arrangement is respectively arranged on the inlet air of corresponding intermediate combustion device Mouth end.
3. combustion optimizing system according to claim 2, it is characterised in that:The baffle arrangement includes three pieces of baffle plates, point It is not rotatably arranged at the corresponding different inwalls of secondary air bellow by electric rotation shaft, and three electric rotation shafts are positioned at same On longitudinal section;When three pieces of baffle plates of the baffle arrangement are in 90 degree with corresponding inwall, the shielded area of baffle arrangement is The 30 ~ 50% of secondary air bellow longitudinal section area.
4. combustion optimizing system according to claim 3, it is characterised in that:The baffle plate is trapezoidal, goes to the bottom as the baffle plate With the 80 ~ 90% of the secondary air bellow inwall joint length of side, upper bottom is 70 ~ 80% for going to the bottom, and is highly vertical with the joint length of side The another side length of side 10 ~ 15%.
5. according to the arbitrary described combustion optimizing system of Claims 1-4, it is characterised in that:When liquidating, swirl flow combustion boiler is During 300MW grades, the auxiliary fire air nozzle is 4, in wall circle of contact arrangement;When the swirl flow combustion boiler that liquidates is 600MW Or during 1000MW grades, the auxiliary fire air nozzle is 8, in double circle of contacts arrangement.
6. combustion optimizing system according to claim 5, it is characterised in that:The auxiliary fire air nozzle is located at burnout degree At the 1-2m of spout lower section.
7. combustion optimizing system according to claim 6, it is characterised in that:The combustion optimizing system also includes that control is single Unit;Described control unit distributes adjusting means, water-cooling wall near wall region flue gas group with the wind powder adjusting apparatus, secondary air flow respectively Measurement apparatus, auxiliary fire air nozzle, temperature field measuring apparatus are divided to be connected with economizer exit Oxygen Amount in Flue Gas field measurement device.
8. the method for burning optimization adjustment being carried out using combustion optimizing system described in claim 1, it is characterised in that:The method is led to The water-cooling wall near wall region flue gas composition measurement apparatus are crossed to water-cooling wall near wall region O2, CO and H2S concentration is measured in real time, is led to Cross wind powder adjusting apparatus and secondary air flow distribution adjusting means regulates and controls respectively into the quality of pc flow rate and two in each burner Secondary wind air quantity, makes each burner quality of pc distribution of flow rate being located in same secondary air bellow gradually be subtracted to both sides by centre Little, secondary wind air quantity is gradually increased by centre to both sides, and causes water-cooling wall near wall region O2, CO and H2S concentration meets simultaneously:O2 ≥1.5%、H2S≤100ppm、CO≤2000ppm;Pendant superheater lower furnace section is monitored by temperature field measuring apparatus Temperature field, by economizer exit Oxygen Amount in Flue Gas field measurement device the oxygen amount field of economizer exit flue is monitored, and controls burnout degree The outlet air quantity of spout and auxiliary fire air nozzle, goes out the uniform temperature fields in pendant superheater lower furnace section, economizer The Oxygen Amount in Flue Gas field of the oxygen amount field of mouth flue is uniform.
9. the method for burning optimization adjustment being carried out using combustion optimizing system described in claim 3, it is characterised in that:The method is led to The water-cooling wall near wall region flue gas composition measurement apparatus are crossed to water-cooling wall near wall region O2, CO and H2S concentration is measured in real time, is led to Cross wind powder adjusting apparatus and secondary air flow distribution adjusting means regulates and controls respectively into the quality of pc flow rate and two in each burner Secondary wind air quantity, makes each burner quality of pc distribution of flow rate being located in same secondary air bellow gradually be subtracted to both sides by centre Little, secondary wind air quantity is gradually increased by centre to both sides, and causes water-cooling wall near wall region O2, CO and H2S concentration meets simultaneously:O2 ≥1.5%、H2S≤100ppm、CO≤2000ppm;Pendant superheater lower furnace section is monitored by temperature field measuring apparatus Temperature field, by economizer exit Oxygen Amount in Flue Gas field measurement device the oxygen amount field of economizer exit flue is monitored, and controls burnout degree The outlet air quantity of spout and auxiliary fire air nozzle, goes out the uniform temperature fields in pendant superheater lower furnace section, economizer The Oxygen Amount in Flue Gas field of the oxygen amount field of mouth flue is uniform;As the water-cooling wall near wall region O that the flue gas composition measurement apparatus are measured2、CO And H2S real-time concentrations:O2< 1.5%, H2During S > 100ppm or CO > 2000ppm, the wind powder adjusting apparatus and secondary air flow Distribution adjusting means concrete regulative mode be:Increase the baffle plate of the secondary wind allocation of the amount of air adjusting means near two ends burner Structure and the angle of bellows inwall, improve the secondary wind intake of two ends burner, reduce two ends burner correspondence First air coal Wind powder adjusting means aperture on powder pipeline, reduces the quality of pc flow rate of two ends burner.
10. burning optimization method of adjustment according to claim 9, it is characterised in that:Comprise the following steps:
(1)Before boiler startup, the inside and outside secondary wind blade opening of each burner is adjusted, and make to be located in same secondary air bellow The inside and outside secondary wind blade opening of each burner it is consistent;During boiler startup, the wind powder adjustment dress on First air pulverized coal channel is adjusted Put, make each burner First air air quantity being located in same secondary air bellow identical with pulverized coal flow;
(2)After boiler thermal-state is stable, the water-cooling wall near wall region O detected by flue gas composition measurement apparatus2, CO and H2S realities When concentration, be sent to the control system, wind powder adjusting apparatus and secondary air flow distribution adjusting means point are controlled by control system The quality of pc flow rate that Tiao Kong do not entered in each burner and secondary wind air quantity, 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 measurement apparatus are measured Area O2, CO and H2S real-time concentrations:O2< 1.5%, H2During S > 100ppm or CO > 2000ppm, the wind powder adjusting apparatus and two The concrete regulative mode of secondary allocation of the amount of air adjusting means is:Increase the secondary wind allocation of the amount of air adjusting means near two ends burner Baffle arrangement and bellows inwall angle, improve the secondary wind intake of two ends burner, reduce two ends burner correspondence one Wind powder adjusting means aperture on secondary wind pulverized coal channel, reduces the quality of pc flow rate of two ends burner;Allocation of the amount of air adjustment dress The each regulation angle of each baffle plate is 5 ~ 10 degree in putting, and the amplitude of accommodation of wind powder adjusting means is 5 ~ 10 degree, steady after adjustment every time After location survey 5 ~ 10min of amount, then carry out next adjustment;
(3)The temperature field in pendant superheater lower furnace section is monitored by temperature field measuring apparatus simultaneously, by Oxygen Amount in Flue Gas Field measurement device monitors the oxygen amount field of economizer exit flue, and Monitoring Data is sent to into the control system, by control system The outlet air quantity of system control fire air nozzle and auxiliary fire air nozzle, makes 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 High, both sides are low in the middle of occurring, and the high distribution characteristicss in middle low, both sides occurs in oxygen content at economizer outlet field, then increase auxiliary after-flame Wind air quantity, reduction burnout degree air quantity;If there are contrary distribution characteristicss, reduce auxiliary burnout degree air quantity, increase burnout degree wind Amount.
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CN108626741A (en) * 2018-04-27 2018-10-09 吴敏 Automatic blasting controls formula boiler
CN109000276A (en) * 2018-04-27 2018-12-14 吴敏 The application method of automatic blasting control formula boiler
CN109631009A (en) * 2019-01-04 2019-04-16 苏州西热节能环保技术有限公司 A kind of Opposed Firing Boiler tube wall temperature global optimization adjustment method
CN110410768A (en) * 2019-08-08 2019-11-05 艾俊清 Pre- high temperature corrosion resistance System and method in Process In A Tangential Firing
CN110410782A (en) * 2019-08-08 2019-11-05 艾俊清 Guarantee that station boiler low nitrogen burning reduces the method and system of furnace outlet NOx value
CN110425565A (en) * 2019-09-06 2019-11-08 国电南京电力试验研究有限公司 A kind of boiler run control method reducing water wall high temperature corrosion
CN110762516A (en) * 2019-11-01 2020-02-07 国电南京电力试验研究有限公司 Directional regulation and control method for combustion tissue in W-flame boiler

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