CN102494333A - Anthracite-combusted single fire ball four-corner direct current burner - Google Patents

Anthracite-combusted single fire ball four-corner direct current burner Download PDF

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Publication number
CN102494333A
CN102494333A CN2011103582725A CN201110358272A CN102494333A CN 102494333 A CN102494333 A CN 102494333A CN 2011103582725 A CN2011103582725 A CN 2011103582725A CN 201110358272 A CN201110358272 A CN 201110358272A CN 102494333 A CN102494333 A CN 102494333A
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China
Prior art keywords
burner
coal
wind
burners
group
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CN2011103582725A
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CN102494333B (en
Inventor
张建文
陈飞
柳公权
张翔
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Shanghai Boiler Works Co Ltd
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Shanghai Boiler Works Co Ltd
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Priority to CN201110358272.5A priority Critical patent/CN102494333B/en
Priority to ES201390040A priority patent/ES2453392B1/en
Priority to PCT/CN2012/073968 priority patent/WO2012159509A1/en
Publication of CN102494333A publication Critical patent/CN102494333A/en
Priority to US13/845,001 priority patent/US20140065561A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • F23C5/28—Disposition of burners to obtain flames in opposing directions, e.g. impacting flames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • F23C5/24—Disposition of burners to obtain a loop flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • F23C6/047—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/005—Burners for combustion of pulverulent fuel burning a mixture of pulverulent fuel delivered as a slurry, i.e. comprising a carrying liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00—Staged combustion
    • F23C2201/10—Furnace staging
    • F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00—Staged combustion
    • F23C2201/20—Burner staging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/10—Pulverizing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/30—Separating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/10—Supply line fittings
    • F23K2203/105—Flow splitting devices to feed a plurality of burners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

An anthracite-combusted single fire ball four-corner direct current burner includes four burner groups placed at the four corners at a hearth and at least one coal pulverizer, wherein the pulverized coal airflow sprayed by the burner groups forms an imaginary tangent circle at the center of the hearth; two groups of burners are vertically arranged at each burner group at intervals; four pulverized coal pipelines are arranged at the outlet of each coal pulverizer and are connected to four concentrated/thin pulverized coal separators correspondingly; the separated four ways of concentrated pulverized coal airflow is transferred to four primary air/concentrated pulverized coal nozzles on the same horizontal plane and at the lower parts of the four corners of the hearth; and the separated four ways of thin pulverized coal airflow is transferred to four primary air/thin pulverized coal nozzles on the same horizontal plane and at the upper parts of the four corners of the hearth. Under the premise of meeting the heat power of the entire boiler, the anthracite-combusted single fire ball four-corner direct current burner increases the pulverized coal concentration at the concentrated pulverized coal area, and enables the wall thermal load qHr at the lower part of the burner to be higher, thereby enabling the combustion temperature at the lower part of the burner to meet the requirement of inflammation and stable combustion for the anthracite, and guaranteeing the anthracite pulverized coal airflow to be combusted timely and the low-load stable combustion of the oilless boiler.

Description

A kind of four jiaos of DC burners of anthracitic single fireball that use
Technical field
The present invention relates to a kind of coal powder burner, particularly a kind of four jiaos of DC burners of anthracitic single fireball that use.
Background technology
The explored coal reserves of China is about 6,400 hundred million tons, and wherein the low-volatile anthracite accounts for 14.6% of coal gross reserves.Power plants uses anthracite and accounts for 3% of coal for power generation total amount, and this numeral is also increasing.Anthracitic volatile content is low, and hydrogen content is low, and ignition temperature is high, and flame propagation velocity is slower, organizes badly like burning, and it is unstable to be prone to that low load combustion takes place, the flame-out easily situation of boiler high load capacity during the ature of coal variation, and efficiency of combustion is general also lower.
Use anthracite at present both at home and abroad and generally adopt the W flame boiler, tangentially fired boiler, and the front-back wall swirl flow combustion boiler that liquidates.W flame boiler heap(ed) capacity is the 600MW grade, and tangentially fired boiler and the front-back wall swirl flow combustion boiler heap(ed) capacity that liquidates is the 300MW grade, and the design and running achievement of 600MW and four jiaos of tangential firing anthracite-fired boilers of above grade is not also arranged.
Anthracitic boiler specially burns since design at the beginning of the seventies, manufacturing in China station boiler manufacturing firm.Along with unit capacity develops into 600MW～1300MW grade, the burner hearth thermal parameter of boiler has bigger variation than the anthracite-fired boiler of 125MW, 300MW grade.At first be furnace volume heat release rate q vReduce, coal dust time of staying in burner hearth prolongs, and helps anthracitic after-flame.But while burner region wall thermic load q HrReduce, though section thermic load q FRaise to some extent, but the caloric receptivity of total burner region water-cooling wall increases, causes the temperature levels of burner region to descend, to anthracitic timely, stable ignition is unfavorable.After particularly capacity is increased to 800MW～1300MW grade; Owing to receive the restriction of single coal nozzle thermal power; The quantity of the coal nozzle that the separate unit coal pulverizer is corresponding need increase by 50% to 100% with respect to 300MW～600MW boiler, is increased to 6 or 8 by 4.Therefore, for example concerning the 1000MW ultra-supercritical boiler, be equipped with under 6 medium-speed pulverizers or the double inlet and outlet coal mill situation, the quantity of the coal nozzle that the separate unit coal pulverizer is corresponding is 8, and the quantity of total coal nozzle reaches 48.Under the situation that adopts the DC burner quadrangle tangential circle to arrange; The quantity of the wind coal nozzle in single angle is 12; Add burner and be divided into 2 to 3 groups in vertical direction, cause the spacing of 2 the wind coal nozzles in burner highest and lowest bigger like this, burner region wall thermic load q HrLower, this zonal combustion temperature is lower, be unfavorable for the anchracite duff air-flow in time, stable ignition and boiler do not throw oily low-load combustion-stabilizing.
1000MW ultra supercritical tower boiler with illustrated in figures 1 and 2 is an example, and existing burner circle of contact arrangement is described, Fig. 2 is the II-II cutaway view of Fig. 1, and Fig. 1 is the I-I cutaway view of Fig. 2.This kind burner comprises a boiler body 1 ', for it has disposed six coal pulverizers 3 ', is numbered A, B, C, D, E, F respectively.The burner hearth 2 ' of boiler is surrounded by four sides water-cooling wall 9 ', is furnished with a sets of burners on each angle of this burner hearth 2 ' separately, and the wind powder that ejects via the sets of burners on these four angles is formed centrally an imaginary circle 11 ' in burner hearth 2 '.
Three groups of burners 10 ' that each sets of burners comprises again vertically, keeps at a certain distance away and arranges.Every group of burner 10 ' further comprises four wind coal nozzles 6 ' and six overfire air jets 8 ', and those nozzles cooperatively interact, and constituted two adjacent burner parts.Wherein three overfire air jets 8 ' and two wind coal nozzles 6 ' are a burner part, and these two wind coal nozzles 6 ' are arranged between these three overfire air jets 8 '; Those nozzles have in addition constituted another burner part with identical arrangement.That is to say, on each angle of burner hearth 2 ', vertically be furnished with 18 overfire air jets 8 ' and 12 wind coal nozzles 6 '.For example, will be positioned at 12 wind coal nozzles 6 ' of 1 bugle, be numbered A1-1 from bottom to top, A1-2, B1-1, B1-2, C1-1, C1-2, D1-1, D1-2, E1-1, E1-2, F1-1, F1-2; 12 wind coal nozzles 6 ' on 4 bugles are numbered A4-1, and A4-2 is to F4-1, F4-2.The method for numbering serial of other angle top nozzles is similar with it.
In addition, the outlet of every coal pulverizer 3 ' is provided with four pulverized coal channels 5 ', on the same angle of every pulverized coal channel 5 ' through a pulverized coal distributor 4 ' and burner hearth 2 ', two wind coal nozzles, 6 ' the corresponding connection partly of same burner.For example, be numbered on the coal pulverizer 3 ' and 2 ' four angles of burner hearth of A, be numbered A1-1 and A1-2, A2-1 and A2-2, A3-1 and A3-2, eight said wind coal nozzles 6 ' of A4-1 and A4-2 connect.That is to say that six coal pulverizers 3 ' each have and are divided into two-way after a pulverized coal channel 5 ' connects pulverized coal distributor 4 ', correspondence is connected to 12 wind coal nozzles 6 ' on burner hearth 2 ' each angle.For example on 1 bugle, the wind coal nozzle of numbering A1-1 and A1-2 connects the wherein pulverized coal channel 5 ' and the pulverized coal distributor 4 ' thereof of A coal pulverizer 3 '; Wherein wind coal nozzle of numbering B1-1 and B1-2 connects the pulverized coal channel 5 ' and the pulverized coal distributor 4 ' thereof of B coal pulverizer 3 ', and other nozzles are connected similar with it with the pairing of coal pulverizer.Yet this arrangement makes that the spacing of nozzle is bigger, causes burner region wall thermic load q HrLower, can not adapt to the requirement of anthracite combustion.
The domestic a large amount of 50MW that successfully put into operation, 125MW and 300MW anthracite-fired boiler almost all adopt above-mentioned middle storage to heat the wind powder feed system, and this system's primary wind and powder mixing temperature can be up to 220～250 ° of C; A wind ratio 14～15%; And can the weary gas that contain moisture content be separated from a wind, send into burner hearth from burner top, thereby reduce coal powder ignition heat; Storage heats the wind powder feed system in the middle of adopting, and is on 50～300MW boiler, successfully to use anthracitic key.But heat the wind powder feed system for the centre storage, be about 50t/h owing to homemade steel ball grinds the power maximum, 600MW and above unit; Every stove will be arranged 6～8 mills, and this system itself is comparatively complicated, adds huge Pulverized Coal Bin; Make Design Institute arrange comparatively difficulty, take up an area of also bigger.Therefore after unit capacity increases to 600MW, generally just no longer adopt this system.
Summary of the invention
Content of the present invention provides a kind of four jiaos of DC burners of anthracitic single fireball that use; Through changing the apart arrangement form of coal powder light-dark; Under the prerequisite that satisfies whole boiler hot power, increased the coal powder density in thick coal culm zone, make lower burner zone wall thermic load q HrHigher, thus make this zonal combustion temperature can reach the requirement of the steady combustion of anthracite ignition, guarantee the anchracite duff air-flow in time catch fire and boiler is not thrown oily low-load combustion-stabilizing.
In order to achieve the above object, technical scheme of the present invention provides a kind of four jiaos of DC burners of anthracitic single fireball that use, and it comprises:
A boiler body, its burner hearth is surrounded by the four sides water-cooling wall; The position that said water-cooling wall intersects in twos forms four angles of the said burner hearth in position;
Four sets of burners, correspondence are arranged on four angles of said burner hearth; Breeze airflow via the sets of burners on said four angles ejects is formed centrally an imaginary circle in this burner hearth;
Each sets of burners is furnished with two groups of burners also in vertical direction with interval:
First group of burner is a wind/thick coal culm burner, and it is in the bottom of said burner hearth; The thick coal culm air-flow is sent in the bottom of said first group of burner in burner hearth, thereby forms a thick coal culm combustion zone in this position of burner hearth;
Second group of burner is a wind/thin powdered coal burner, and it is in the top of said burner hearth, and is positioned at the top of said first group of burner; The thin powdered coal air-flow is sent on the top of said second group of burner in said burner hearth, thereby forms a thin powdered coal combustion zone in this position of said burner hearth.
Said first group of burner further includes a plurality of overfire air jets and a plurality of wind/thick coal culm nozzle in vertical direction, and corresponding interting of each said wind/thick coal culm nozzle is arranged between those overfire air jets.
Said second group of burner further includes a plurality of overfire air jets and a plurality of wind/thin powdered coal nozzle in vertical direction, and corresponding interting of each said wind/thin powdered coal nozzle is arranged between those overfire air jets.
Preferably, said first group of burner comprises seven overfire air jets and six wind/thick coal culm nozzles; Said second group of burner comprises other seven overfire air jets and six wind/thin powdered coal nozzles.
Said four jiaos of DC burners also include at least one coal pulverizer;
The outlet of every said coal pulverizer is provided with four pulverized coal channels; Every pulverized coal channel is connected to a dense-and-weak separator, by said dense-and-weak separator a wind/breeze airflow is carried out deep or light separating treatment;
The deep or light different two-way air-flow of same said dense-and-weak separator output is transported to respectively on the first group of burner and second group of burner on the same angle of said burner hearth;
Wherein one road thick coal culm air-flow is transported to one of them wind/thick coal culm nozzle of said first group of burner; Another road thin powdered coal air-flow is transported to one of them wind/thin powdered coal nozzle of said second group of burner.
Export from same said coal pulverizer, and separate four road thick coal culm air-flows that form respectively by four dense-and-weak separators, correspondence is delivered to four wind/thick coal culm nozzles that are positioned at same horizontal plane on four angles of said burner hearth;
Separate four road thin powdered coal air-flows that form, correspondence exports four wind/thin powdered coal nozzles that are positioned at same horizontal plane on four angles of said burner hearth to.
The said thick coal culm air-flow in each road comprises from a said wind/breeze airflow isolated 80% coal dust and 50% a wind;
The said thin powdered coal air-flow in each road comprises from a said wind/breeze airflow remaining 20% coal dust and 50% a wind;
Each nozzle of said four jiaos of DC burners is provided with surrounding air; Secondary wind is set to the wind of setovering.
On the vertical direction of said burner hearth, the spacing of a uppermost wind/thin powdered coal nozzle and a nethermost wind/thick coal culm nozzle is controlled by the spacing of first group of burner and second group of burner on each angle of said burner hearth.
Compared with prior art, the four jiaos of DC burners of anthracitic single fireball that use according to the invention, its advantage is:
1, the present invention is through adopting " medium-speed pulverizer or the unit pulverized-coal system that goes with each other all the time of band coal powder light-dark separation device ", and the upper and lower in burner hearth has formed the combustion zone of thin powdered coal and thick coal culm respectively.Thereby, make wherein wind powder ratio and a wind ratio of a wind/thick coal culm all to be better than the relevant parameter when storage heats the wind powder feed system in the middle of using in the prior art.Simultaneously, 50% wind that will contain half moisture content is separated, and sends into burner hearth from a wind/thin powdered coal nozzle on burner top; Though the mixing temperature of primary wind and powder, low, the such design of mixing temperature of the primary wind and powder that heats the wind powder feed system than storing in a warehouse in the middle of adopting; Can know through Theoretical Calculation; Heat the wind powder feed system with storage in the middle of the employing and compare, the ignition heat of (dense) breeze airflow is basic the same, thereby has guaranteed the stable ignition of thick coal culm air-flow.
2, the present invention is through making the breeze airflow of every coal pulverizer outlet; With one deck totally 4 wind/thick coal culm nozzles; And one deck corresponding arrangements that connect of totally 4 light wind/coal nozzle; Can under the prerequisite that satisfies whole boiler hot power, increase the coal powder density in thick coal culm zone, at this moment the combustion zone wall thermic load q of bottom HrHigher, make this zonal combustion temperature can reach the requirement of the steady combustion of anthracite ignition, guarantee the anchracite duff air-flow in time catch fire and boiler is not thrown oily low-load combustion-stabilizing.
When 3, the spacing of the uppermost wind of burner/thin powdered coal nozzle and a nethermost wind/thick coal culm nozzle is controlled in the desirable scope; Can satisfy a uppermost wind thin powdered coal nozzle equally under the prerequisite of furnace outlet screen end spacing and anthracite combustion efficient, make the discharge capacity of boiler nitrogen oxide reduce.
4, four groups of burner arrangement are on four angles of boiler four sides water-cooling wall; Around each coal nozzle, surrounding air is set, secondary wind is provided with biasing wind, forms the burning form of " bellows chamber powder "; Therefore; Be not easy to take place the phenomenon of a wind coal dust subsides wall, help preventing burner hearth slagging scorification and high temperature corrosion, also better to the adaptability that coal changes.
Description of drawings
Fig. 1, Fig. 2 are respectively the plane and the elevation of existing burner, wherein, Fig. 1 be Fig. 2 I-I to cutaway view, Fig. 2 be Fig. 1 II-II to cutaway view;
Fig. 3 is the medium-speed pulverizer of the band coal powder light-dark separation device that uses among the present invention or the operation principle sketch map of the unit pulverized-coal system that goes with each other all the time;
Fig. 4, Fig. 5 are respectively plane and the elevation that uses four jiaos of DC burners of anthracitic single fireball according to the invention, and show the apart arrangement form of coal powder light-dark in this burner; Fig. 4 be Fig. 5 I-I to cutaway view, Fig. 5 be Fig. 4 II-II to cutaway view.
The specific embodiment
Below in conjunction with the description of drawings specific embodiment of the present invention.
Referring to shown in Figure 3; The four jiaos of DC burners of anthracitic single fireball that use according to the invention; Adopted " medium-speed pulverizer or the unit pulverized-coal system that goes with each other all the time of band coal powder light-dark separation device "; Its cardinal principle is on the every pulverized coal channel 50 of coal pulverizer 30 outlets, increases a coal powder light-dark separation device 40, and a wind/coal dust is carried out deep or light separation; " dense " breeze airflow that is divided into one road 80% coal dust and 50% wind; With " light " breeze airflow of one tunnel remaining 20% coal dust and 50% wind, these two strands of breeze airflows are sent into corresponding dense combustion zone 21 and the 22 tissue burnings of light combustion zone in the burner hearth 20 respectively through " a wind/thick coal culm " nozzle 60 and " a wind/thin powdered coal " nozzle 70 of burner.
Below will combine Fig. 4, Fig. 5; Explain that the concrete structure that uses four jiaos of DC burners of anthracitic single fireball according to the invention reaches the wherein apart arrangement form of each bias pulverized coal; Wherein Fig. 4 be Fig. 5 I-I to cutaway view, Fig. 5 be Fig. 4 II-II to cutaway view.
Said four jiaos of DC burners comprise a boiler body 1, for it disposes six coal pulverizers 3, are numbered A, B, C, D, E, F respectively.The burner hearth 2 of this boiler is surrounded by four sides water-cooling wall 9, on each angle of burner hearth 2, is furnished with a sets of burners separately, and the breeze airflow that ejects via the sets of burners on these four angles is formed centrally an imaginary circle 11 in burner hearth 2.Describe for ease, hereinafter adjacent two water-cooling wall 9 sides are intersected in the angle that forms, that angle that is positioned at the lower left corner shown in Figure 4 is called 1 bugle, with clockwise ordering other angles is called 2 bugles successively to 4 bugles.
Each sets of burners is furnished with two groups of burners in vertical direction with interval.First group of burner is called " a wind/thick coal culm " burner, and it is positioned at lower furnace portion, and further includes seven overfire air jets 8, and interts and to be arranged in six wind/thick coal culm nozzles 6 between those overfire air jets 8.Second group of burner is called " a wind/thin powdered coal " burner, and it is positioned at the top of first group of burner, and further includes other seven overfire air jets 8, and interts and to be arranged in six wind/thin powdered coal nozzles 7 between those overfire air jets 8.
Describe for ease, will be arranged in first group of burner of 1 bugle bottom, six wind/thick coal culm nozzles 6 are numbered A1-1, B1-1, C1-1, D1-1, E1-1, F1-1; To be arranged in second group of burner on 1 bugle top, six wind/thin powdered coal nozzles 7 are numbered A1-2, B1-2, C1-2, D1-2, E1-2, F1-2.And, be numbered A4-1 ~ F4-1 with six wind/thick coal culm nozzles 6 in first group of burner on 4 bugles; Six wind/thin powdered coal nozzles 7 with in second group of burner on 4 bugles are numbered A4-2 ~ F4-2.On other angles to burner hearth 2, the nozzle of each group " a wind/thick coal culm " and " a wind/thin powdered coal " is numbered in a similar manner.
The outlet of every coal pulverizer 3 is provided with four pulverized coal channels 5, every pulverized coal channel 5 through a dense-and-weak separator 4 after, respectively with the same angle of burner hearth 2 on an a wind/thick coal culm nozzle 6 and a wind/thin powdered coal nozzle 7 corresponding connections.
For instance, be numbered the output of the coal pulverizer 3 of A, after handling through four dense-and-weak separators 4, obtain two kinds of deep or light each different four road breeze airflows.Four road thick coal culm air-flows wherein respectively in first burner of burner hearth 2 bottoms, and are numbered A1-1; A2-1; A3-1, four wind of A4-1/6 corresponding connections of thick coal culm nozzle, these four wind/thick coal culm nozzles 6 should be to be positioned on the same horizontal plane of 2 four angle bottoms of burner hearth.Other four road thin powdered coal air-flows respectively in second burner on burner hearth 2 tops, and are numbered A1-2; A2-2; A3-2, the wind of A4-2/7 corresponding connections of thin powdered coal nozzle, these four wind/thin powdered coal nozzles 7 should be to be positioned on the same horizontal plane on 2 four angle tops of burner hearth.The breeze airflow of coal pulverizer 3 outputs of other numberings, with the annexation of each nozzle, similar with it; Omitted in the accompanying drawings relevant pulverized coal channel, dense-and-weak separator and with the connecting line of nozzle.
Via above-mentioned apart arrangement, make that all isolated thick coal culm air-flows all are sent to the latter half in the whole burner hearth 2 in the output of each coal pulverizer 3, thereby formed a thick coal culm combustion zone in this position; And isolated thin powdered coal air-flow can be sent to the first half in the burner hearth 2, and has formed a thin powdered coal combustion zone in this position, meets system principle shown in Figure 3.Therefore, can under the prerequisite that satisfies whole boiler hot power, increase the coal powder density in thick coal culm zone, make lower burner zone wall thermic load q HrHigher, this zonal combustion temperature can reach the requirement of the steady combustion of anthracite ignition, guarantee the anchracite duff air-flow in time catch fire and boiler is not thrown oily low-load combustion-stabilizing.
Preferably; Satisfying topmost at the same time, a wind coal nozzle shields the spacing at the end to burner hearth 2 outlets; And under the prerequisite of bituminous coal combustion efficient, can set the spacing between first group and the second group of burner on each angle, make the spacing of a uppermost wind/thin powdered coal nozzle and a nethermost wind/thick coal culm nozzle; Be controlled in the desirable scope, thereby the discharge capacity of the nitrogen oxide of boiler is reduced.
In addition; The present invention is also on four angles of burner hearth 2, and through for around each coal nozzle surrounding air being set, secondary wind is provided with biasing wind; Form the burning form of " bellows chamber powder "; Thereby prevent the phenomenon generation that a time wind coal dust pastes wall, help preventing burner hearth slagging scorification and high temperature corrosion, also better to the adaptability that coal changes.
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.

Claims (8)

1. one kind uses four jiaos of DC burners of anthracitic single fireball, it is characterized in that, comprises:
A boiler body (1), its burner hearth (2) is surrounded by four sides water-cooling wall (9); The position that said water-cooling wall (9) intersects in twos forms four angles of said burner hearth (2);
Four sets of burners, correspondence are arranged on four angles of said burner hearth (2); Breeze airflow via the sets of burners on said four angles ejects is formed centrally an imaginary circle (11) in this burner hearth (2);
Each sets of burners is furnished with two groups of burners also in vertical direction with interval:
First group of burner is a wind/thick coal culm burner, and it is in the bottom of said burner hearth (2); The thick coal culm air-flow is sent in the bottom of said first group of burner in burner hearth (2), thereby forms a thick coal culm combustion zone in this position of burner hearth (2);
Second group of burner is a wind/thin powdered coal burner, and it is in the top of said burner hearth (2), and is positioned at the top of said first group of burner; The thin powdered coal air-flow is sent on the top of said second group of burner in said burner hearth (2), thereby forms a thin powdered coal combustion zone in this position of said burner hearth (2).
2. use four jiaos of DC burners of anthracitic single fireball according to claim 1, it is characterized in that,
Said first group of burner in vertical direction; Further include a plurality of overfire air jets (8) and a plurality of wind/thick coal culm nozzle (6), corresponding interting of each said wind/thick coal culm nozzle (6) is arranged between the said overfire air jet (8).
3. like the said four jiaos of DC burners of anthracitic single fireball that use of claim 2, it is characterized in that,
Said second group of burner in vertical direction; Further include a plurality of overfire air jets (8) and a plurality of wind/thin powdered coal nozzle (7), corresponding interting of each said wind/thin powdered coal nozzle (7) is arranged between the said overfire air jet (8).
4. like the said four jiaos of DC burners of anthracitic single fireball that use of claim 3, it is characterized in that,
Said first group of burner comprises seven overfire air jets (8) and six wind/thick coal culm nozzles (6); Said second group of burner comprises other seven overfire air jets (8) and six wind/thin powdered coal nozzles (7).
5. like claim 3 or 4 said four jiaos of DC burners of anthracitic single fireball that use, it is characterized in that,
Said four jiaos of DC burners also include at least one coal pulverizer (3);
The outlet of every said coal pulverizer (3) is provided with four pulverized coal channels (5); Every pulverized coal channel (5) is connected to a dense-and-weak separator (4), by said dense-and-weak separator (4) a wind/breeze airflow is carried out deep or light separating treatment;
The different two-way air-flow of coal powder light-dark of same said dense-and-weak separator (4) output is transported to respectively on the first group of burner and second group of burner on the same angle of said burner hearth (2);
Wherein one road thick coal culm air-flow is transported to one of them wind/thick coal culm nozzle (6) of said first group of burner; Another road thin powdered coal air-flow is transported to one of them wind/thin powdered coal nozzle (7) of said second group of burner.
6. like the said four jiaos of DC burners of anthracitic single fireball that use of claim 5, it is characterized in that,
Export from same said coal pulverizer (3), and separate four road thick coal culm air-flows that form separately by four dense-and-weak separators (4), correspondence is delivered to four wind/thick coal culm nozzle (6) that is positioned at same horizontal plane on (2) four angles of said burner hearth;
Separate four road thin powdered coal air-flows that form, correspondence exports four wind/thin powdered coal nozzle (7) that is positioned at same horizontal plane on (2) four angles of said burner hearth to.
7. like the said four jiaos of DC burners of anthracitic single fireball that use of claim 6, it is characterized in that,
The said thick coal culm air-flow in each road comprises from a said wind/breeze airflow isolated 80% coal dust and 50% a wind;
The said thin powdered coal air-flow in each road comprises from a said wind/breeze airflow remaining 20% coal dust and 50% a wind;
Each nozzle of said four jiaos of DC burners is provided with surrounding air; Secondary wind is set to the wind of setovering.
8. use four jiaos of DC burners of anthracitic single fireball according to claim 1, it is characterized in that,
On the vertical direction of said burner hearth (2); The spacing of a uppermost wind/thin powdered coal nozzle (7) and a nethermost wind/thick coal culm nozzle (6) is controlled by the spacing of first group of burner and second group of burner on each angle of said burner hearth (2).
CN201110358272.5A 2011-11-14 2011-11-14 Anthracite-combusted single fire ball four-corner direct current burner Active CN102494333B (en)

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ES201390040A ES2453392B1 (en) 2011-11-14 2012-04-13 A tangentially heated boiler of a single fireball for anthracite combustion.
PCT/CN2012/073968 WO2012159509A1 (en) 2011-11-14 2012-04-13 Single fireball quadrangle direct flow burner for combustion of anthracite coal
US13/845,001 US20140065561A1 (en) 2011-11-14 2013-03-17 Single-fireball tangentially-firing boiler for the burning of anthracite

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