WO2013071713A1 - Thick-thin coal dust separation and arrangement structure for single-fireball eight-corner straight-flow burner - Google Patents

Thick-thin coal dust separation and arrangement structure for single-fireball eight-corner straight-flow burner Download PDF

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Publication number
WO2013071713A1
WO2013071713A1 PCT/CN2012/071222 CN2012071222W WO2013071713A1 WO 2013071713 A1 WO2013071713 A1 WO 2013071713A1 CN 2012071222 W CN2012071222 W CN 2012071222W WO 2013071713 A1 WO2013071713 A1 WO 2013071713A1
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WO
WIPO (PCT)
Prior art keywords
burner
pulverized coal
wall
coal
nozzle
Prior art date
Application number
PCT/CN2012/071222
Other languages
French (fr)
Chinese (zh)
Inventor
陈飞
张建文
肖琨
李江涛
Original Assignee
上海锅炉厂有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海锅炉厂有限公司 filed Critical 上海锅炉厂有限公司
Priority to US13/808,121 priority Critical patent/US20140038115A1/en
Priority to EP12824757.4A priority patent/EP2781833A4/en
Priority to ZA2013/01308A priority patent/ZA201301308B/en
Publication of WO2013071713A1 publication Critical patent/WO2013071713A1/en

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Classifications

    • 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
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
    • 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
    • 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
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air above the fire

Definitions

  • the invention relates to a technology belonging to a pulverized coal combustion device, in particular to a pulverized coal separation and arrangement structure of a single fireball octagonal direct current burner burning anthracite. Background technique
  • China's proven coal reserves are about 640 billion tons, of which low-volatility anthracite accounts for about 14.6% of total coal reserves.
  • the burning of anthracite in thermal power plants in China accounts for about 3% of the total coal used for power generation, and this figure is also increasing.
  • Anthracite has low volatile content, low hydrogen content, high ignition temperature, and slow flame propagation. If the combustion structure is not good, it is prone to low-load combustion instability. When the coal quality deteriorates, the high load of the boiler is easily extinguished. The combustion efficiency is generally lower.
  • anthracite coal at home and abroad uses W flame boilers, four-corner tangentially fired boilers, and front and rear wall counter-rotating swirling combustion boilers.
  • the maximum capacity of the W-fired boiler is 600MW.
  • the maximum capacity of the four-corner tangentially fired boiler and the front and rear wall counter-rotating combustion boiler is 300MW.
  • the number of pulverized coal nozzles corresponding to a single coal mill is 50% to 100% higher than that of a 300MW ⁇ 600MW boiler due to the limitation of the thermal power of a single pulverized coal nozzle.
  • the number of pulverized coal nozzles for a single coal mill is 8 and the total number of pulverized coal nozzles is 48. .
  • the number of single-angle primary pulverized coal nozzles is twelve, and the burner is divided into two to three groups in the vertical direction, which results in the top and bottom of the burner.
  • 2 PrimaryAir nozzle pitch is large, the burner zone wall heat load & low, low temperature combustion region, It is not conducive to the timely and stable ignition of the anthracite powder flow and the boiler does not oil and low load and stable combustion.
  • the primary air powder mixing temperature can reach 220 ⁇ 250° C, and the secondary air ratio is 14 ⁇ 15%. It can separate the waste gas containing water from the primary air, and send it into the furnace from the upper part of the burner to reduce the heat of the coal powder.
  • the intermediate storage hot air feeding system is successfully used on the 50 ⁇ 300MW boiler. The key to anthracite.
  • the grate 2 consists of a four-sided water wall 7, on each corner of which a set of burners 8 are arranged, the nozzle centerline of which forms an imaginary cut circle 9 in the furnace 2.
  • Each group of burners 8 is further divided into three groups of small burners in the vertical direction, separated by a certain distance.
  • Each group of small burners is composed of four primary air pulverized coal nozzles 5 and six secondary air nozzles 6. That is, 12 primary air pulverized coal nozzles 5 and 18 secondary air nozzles 6 are arranged at intervals in the vertical direction.
  • 12 primary air pulverized coal nozzles 5 of No. 1 angle are numbered A1-1, Al-2, Bl-1, Bl-.
  • No. 4 corner 12 primary air pulverized coal nozzle No. 5 is numbered A4-1 , A4-2, B4-1, B4-2, C4-1, C4-2, D4-1, D4-2, E4-1, E4-2, F4-l, F4-2.
  • the coal mill 3 is connected to the primary pulverized coal nozzle 5 through the pulverized coal pipe 4, and each pulverized coal machine 3 outlet has four pulverized coal pipes 4, each of which passes through a pulverized coal distributor 10 and the same
  • Two primary air pulverized coal nozzles 5 adjacent to the elevation are connected, such as the coal mill 3 numbered A and numbered A1-1, Al-2, A2-1, A2-2, A3-1, A3-2 , A4-1, A4-2 a total of eight primary air pulverized coal nozzles 5 connection.
  • each group of burners 8 is arranged with 12 primary air pulverized coal nozzles 5 arranged in the vertical direction, the wall surface heat load q &> of the arrangement burner area is low, and cannot meet the requirements of anthracite combustion.
  • Summary of the invention The invention provides a single fireball octagonal direct current burner pulverized coal separation and arrangement structure, which realizes a high wall heat load q & of the burner region.
  • a plurality of burners respectively disposed on the water wall and communicating with the furnace through the water wall; the burner is provided with a nozzle disposed in the furnace;
  • a concentration separator which is respectively connected to a plurality of burners through a pulverized coal pipeline; and, a plurality of coal mills, which are connected to the rich and light separator through a pulverized coal pipeline;
  • At least one coal mill is provided for each boiler body
  • the utility model is characterized in that: the above boiler body is provided with eight burner groups, each of which is provided with two burner groups, each burner group containing a plurality of nozzles facing the same burner, eight The centerline of each nozzle on the burner block forms an imaginary tangent circle in the furnace.
  • the water-cooling walls on the four sides of the boiler body are respectively set as the front wall, the rear wall, the left wall and the right wall of the boiler body, and the front wall and the rear wall are oppositely disposed, and the left wall and the right wall are oppositely disposed;
  • the center line of the burner nozzle on the rear wall intersects with the water wall where it is located at an intersection, the distance from the nearest adjacent water wall connection is Ll, l/10Lw ⁇ L1 ⁇ 4/10Lw, Lw is the boiler The distance between the front wall and the back wall of the body.
  • the center line of the nozzle of the burner disposed on the left or right wall of the wall intersects with the water wall where it is located at an intersection, the distance from the nearest adjacent water wall connection is L2, l/10Ld ⁇ L2 ⁇ 4/10Ld, Ld is the distance between the left and right wall of the boiler body.
  • the first burner group described above comprises a primary air/concentrated pulverized coal burner, the primary air/rich pulverized coal combustion At least one primary air/concentrated coal powder nozzle and two secondary air nozzles are disposed on the burner in a vertical direction, and the primary air/concentrated coal powder nozzle is spaced apart from the secondary air nozzle.
  • a plurality of pulverized coal pipes are connected to the outlet of each of the above coal mills, and each pulverized coal pipe is divided into a concentrated pulverized coal pipe and a light pulverized coal pipe by the rich and light separator.
  • the above-mentioned concentrated coal powder pipeline is provided with a coal powder distributor, and is divided into a plurality of thin concentrated coal powder pipelines through the coal powder distributor, and is respectively connected with a plurality of said primary air/concentrated coal powder nozzles;
  • the above-mentioned pulverized coal powder pipeline is provided with a coal powder distributor, and is divided into a plurality of fine pulverized coal powder pipelines through the pulverized coal distributor, and is respectively connected with a plurality of primary air/light coal powder nozzles.
  • the distance between the above-mentioned primary air/light coal powder nozzle disposed at the uppermost portion and the above-mentioned primary air/concentrated coal powder nozzle disposed at the lowermost portion is between 1 m and 2 m.
  • the single fireball octagonal direct current burner pulverized coal separation and arrangement structure has the advantages of:
  • the pulverized coal gas flow at the outlet of each coal mill is connected with 8 concentrated primary air/pulverized coal nozzles on the same layer, and 8 light primary air/pulverized coal nozzles in the same layer are arranged.
  • concentration of pulverized coal in the concentrated pulverized coal area is increased, so that the wall heat load qHr of the lower burner area is higher.
  • the combustion temperature in this area can meet the requirements of anthracite ignition and stable combustion, and the anthracite powder flow is guaranteed. Timely fire and the boiler does not oil and low load steady combustion;
  • the eight groups of burners are arranged on the water wall of the four sides of the boiler. Compared with the four groups of burners arranged at the four corners, the air supply conditions of the two jets are better, and it is not easy to occur once the wind coal powder is attached to the wall. To prevent furnace slagging and high temperature corrosion, the adaptability of coal type changes is better;
  • the eight groups of burners are arranged on the four-sided water-cooled wall of the boiler body. Compared with the four sets of burners arranged at the four corners, the heat flow intensity at the nozzle outlet is higher, and the amount of heat exchange by convection and radiation is greatly improved. Conducive to the timely ignition of the anthracite powder flow and the boiler does not oil and low load stable combustion;
  • the distance between the primary air/light coal powder nozzle at the top of the burner and the primary air/concentrated coal powder nozzle at the lowermost level is controlled within 1 to 2 m, which also satisfies the spacing of the top air pulverized coal nozzle to the bottom of the furnace outlet.
  • the total height of the boiler is reduced, the manufacturing cost of the boiler is greatly reduced, and the emission of nitrogen oxides of the boiler is reduced.
  • FIG. 1 is a schematic view showing a prior art burner arrangement, which is a cross-sectional view taken along line I - I of Fig. 2;
  • Fig. 2 is a schematic view showing a prior art burner arrangement, which is a cross-sectional view of Fig. 1;
  • FIG. 4 is a schematic view showing a structure of separation and arrangement of pulverized coal of a single fireball octagonal direct current burner according to the present invention, which is a cross-sectional view taken along line I - I of FIG. 5;
  • Fig. 5 is a schematic view showing the structure of the separation and arrangement of the pulverized coal of the single fireball octagonal direct current burner according to the present invention, which is a cross-sectional view of the ⁇ - ⁇ of Fig. 4. Specific form
  • Each boiler comprises a boiler body 1 comprising a four-sided water-cooling wall 9 surrounded by a boiler body 1 and an internal space enclosed by the four-side water-cooling wall 9 forms a boiler Furnace 2 of the body 1.
  • the depth of the furnace 2 is Ld
  • the width of the furnace 2 is Lw.
  • Each of the boiler bodies 1 is provided with eight burner groups, which are respectively disposed on the four-side water-cooling wall 9 of the boiler body 1, and each of the water-cooling walls 9 is provided with two burner groups, each of which is provided with two burner groups.
  • the burner group contains a plurality of burners 10 arranged vertically.
  • the eight burner groups are circumferentially centered around the center of the furnace 2, and the angle between them is the same.
  • Each of the burners 10 is provided with nozzles.
  • the nozzles of the burners 10 are oriented in the same direction, and the nozzles of the burners 10 in the eight burner groups are disposed toward the inside of the furnace 2, and eight burner groups are provided.
  • each of the upper nozzles i.e., the ejection direction of each nozzle on the eight burner groups
  • the center line of each of the upper nozzles forms an imaginary tangential circle 11 in a counterclockwise direction (counterclockwise in a plan view shape) at the inner center of the furnace 2, the imaginary cut Round 11
  • the center of the circle coincides with the center of the furnace 2.
  • the opposite two-side water-cooling wall 9 of the four-side water-cooling wall 9 of the boiler body 1 is the front wall and the rear wall of the boiler body 1, and the other pair of opposite two-side water-cooling walls 9 are the left and right wall of the boiler body 1, the boiler body
  • the distance between the front wall and the rear wall of 1 is the depth Ld of the furnace 2
  • the distance between the left and right wall of the boiler body 1 is the width Lw of the furnace 2.
  • the center line of the nozzle of the burner 10 respectively disposed on the front wall or the rear wall of the boiler body 1 intersects the water-cooling wall 9 at the position where the burner 10 is disposed at an intersection point which is away from the corner of the nearest furnace 2 (this The distance between the corners is the junction between the adjacent two water-cooling walls 9), which is in the range of l/10Lw Ll 4/10 Lw.
  • each burner group is divided into two groups in a vertical direction, the two groups being a first burner group and a second burner group, respectively, and the first burner group is disposed in the boiler.
  • the lower portion of the body 1 wall, the second burner group is disposed at the upper portion of the wall of the boiler body 1.
  • the burner 10 in the first burner group is a primary air/concentrated pulverized coal burner, and the primary air/concentrated pulverized coal burner is provided with nozzles, and the nozzles are arranged toward the inside of the furnace 2 according to the above structural requirements, and the furnace Internal connectivity.
  • the nozzle disposed on the primary air/concentrated pulverized coal burner comprises six primary/concentrated pulverized coal nozzles 6 and seven secondary air nozzles 8, each of which is disposed at two intervals. Between adjacent secondary air nozzles 8.
  • Each of the secondary air nozzles 8 is connected to the secondary air large wind box through a pipeline, and the secondary air large wind box is connected to the external secondary air duct. In order to ensure complete combustion, secondary air is introduced into the boiler through the secondary air nozzle 8.
  • the twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the front wall are numbered A1-1-1, Al-1-2, B1- 1-1, Bl-1-2, C1-1-1, C1-1-2, Dl-1-1, Dl-1-2, El-1-1, El-1-2, Fl-1- 1, Fl-l-2.
  • the twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the rear wall are numbered A3-1-1, A3-1-2, B3- 1-1, B3-1-2, C3-1-1, C3-1-2, D3-1-1, D3-1-2, E3-1-1, E3-1-2, F3-1- 1 , F3-l-2o
  • the twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the left wall are numbered A2-1-1, respectively.
  • the twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the right wall are numbered A4-1-1, A4-1-2, B4, respectively.
  • the pulverized coal nozzles 6 are correspondingly disposed on the same horizontal surface and are nozzles of the same layer.
  • the concentrated coal powder nozzles 6 are correspondingly disposed on the same horizontal surface and are nozzles of the same layer.
  • Primary/rich pulverized coal with numbers Cl-1-1, Cl-l-2, C3-ll, C3-l-2, C2-ll, C2-l-2, C4-ll, C4-1-2
  • the nozzles 6 are correspondingly disposed on the same horizontal surface and are the same layer of nozzles.
  • the 6 phases are correspondingly set on the same horizontal surface and are the same layer of nozzles.
  • Each of the secondary air nozzles 8 is connected to the secondary air large wind box through a pipeline, and the secondary air large wind box is connected to the external secondary air duct. In order to ensure the complete combustion, the secondary air nozzle 8 is added to the boiler. Second wind.
  • the twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the front wall are numbered A1-2-1, Al-2-2, B1-2 -1 , Bl-2-2, C1-2-1, C1-2-2, Dl-2-1, Dl-2-2, El-2-1, El-2-2, Fl-2-1 , Fl-2-2.
  • the twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the rear wall are numbered A3-2-1, A3-2-2, B3-2 -1, B3-2-2, C3-2-1, C3-2-2, D3-2-1, D3-2-2, E3-2-1, E3-2-2, F3-2-1 , F3-2-2.
  • the twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the left wall are numbered A2-2-1, ⁇ 2-2-2, ⁇ 2- 2-1, ⁇ 2-2-2, C2-2-1, C2-2-2, D2-2-1, D2-2-2, E2-2-1, E2-2-2, F2-2- 1 , ⁇ 2-2-2 0
  • Twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the right wall are numbered A4-2-1 , A4-2-2, B4-2-1, B4-2-2, C4-2-1, C4-2-2, D4-2-1, D4-2-2, E4-2-1, E4 -2-2, F4-2-1, F4-2-2.
  • the numbers are A1-2-K Al-2-2, A3-2-K A3-2-2, A2-2-K A2-2-2, A4-2-l, A4-2-2
  • the wind/pale pulverized coal nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane.
  • the powder nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane.
  • the distance between the primary air/light coal powder nozzle 7 disposed at the uppermost portion and the primary air/rich coal powder nozzle 6 disposed at the lowermost portion is between 1 m and 2 m.
  • each pulverized coal pipe 5 is connected to the outlet of each coal mill 3, and each pulverized coal pipe 5 is provided with a pulverized coal separator 52, and the viscous separator 4 divides each pulverized coal pipe 5 into one thick Pulverized coal pipe and a light coal powder pipe.
  • a pulverized coal distributor 12 is further disposed on each concentrated pulverized coal pipeline, and the pulverized coal distributor 12 divides the concentrated pulverized coal pipeline into two thin concentrated pulverized coal pipelines, respectively, and two burning on the same surface water wall 9
  • the primary/rich pulverized coal nozzles 6 of the respective primary/concentrated pulverized coal burners in the group are connected.
  • each coal mill 3 to the primary/rich pulverized coal nozzle 6 is as follows:
  • the first coal mill A is connected to the numbers Al-1-1, Al-1-2, A2-1-K A2-1-2, A3-ll, A3-l-2, A4-ll, A4-1. -2 primary air/concentrated pulverized coal nozzle 6.
  • the third coal mill C is connected by the number C1-1-K Cl-1-2. C2-1-K C2-1-2. C3-1-K C3-1-2, C4-1-K C4- Primary air/concentrated pulverized coal nozzle 6 of 1-2.
  • the fourth coal mill D is respectively connected to the numbers Dl-1-1, Dl-1-2, D2-ll, D2-l-2, D3-ll, D3-l-2, D4-ll, D4-1- 2 primary air/concentrated pulverized coal nozzle 6.
  • the fifth coal mill E is connected to the numbers El-1-1, El-1-2, E2-1-K E2-1-2, E3-ll, E3-l-2, E4-ll, E4-1 -2 primary air/concentrated pulverized coal nozzle 6.
  • the sixth coal mill F is connected to the number Fl-1-1, Fl-1-2. F2-1-K F2-1-2. F3-ll, F3-l-2, F4-ll, F4-1 -2 primary air/concentrated pulverized coal nozzle 6.
  • a pulverized coal distributor 12 is disposed on each of the pulverized coal powder pipes, and the pulverized coal distributor 12 divides the pulverized coal pulverized coal pipe into two fine pulverized coal pulverized pipes, respectively, and two burners on the same surface water wall 9
  • the primary/light pulverized coal nozzles 7 of the respective primary/light pulverized coal burners in the group are connected.
  • connection of each coal mill 3 to the primary/light coal powder nozzle 7 is as follows:
  • the first coal mill A is connected to the numbers Al-2-l, Al-2-2, A2-2-K A2-2-2, A3-2-K A3-2-2, A4-2-l, Primary air/light coal powder nozzle 7 of A4-2-2.
  • the second coal mill B is connected by the number B1-2-1, Bl-2-2. B2-2-K B2-2-2. B3-2-K B3-2-2, B4-2-K B4 Primary air/light coal powder nozzle -2-2.
  • the third coal mill C is connected by the number Cl-2-l, Cl-2-2. C2-2-K C2-2-2. C3-2-K C3-2-2, C4-2-K C4 Primary air/light coal powder nozzle -2-2.
  • the fourth coal mill D is connected to the numbers Dl-2-l, Dl-2-2, D2-2-K D2-2-2, D3-2-l, D3-2-2, D4-2-l , D4-2-2 primary air / light coal powder nozzle 7.
  • the fifth coal mill E is connected to the numbers El-2-l, El-2-2, E2-2-K E2-2-2, E3-2-K E3-2-2, E4-2-K E4 Primary air/light coal powder nozzle -2-2.
  • the sixth coal mill F connection number is Fl-2-l, Fl-2-2.
  • the single fireball octagonal direct current burner pulverized coal separation and arrangement structure of the anthracite coal adopts the "medium speed grinding or double inlet and double outlet direct blowing type pulverizing system with pulverized coal concentration and separation device".
  • the main principle is to add a pulverized coal separator concentrator 4 to each pulverized coal pipe 5 connected to the outlet of the coal mill 3, and separate the primary air/pulverized coal into a light and dark separation, and divide it into 80% pulverized coal and 50% of the primary/concentrated pulverized coal flow, and the remaining 20% of the pulverized coal and 50% of the primary/light pulverized coal flow, respectively, through the primary/rich pulverized coal nozzle 6 and the primary air in the burner group /Pale pulverized coal nozzle 7, sent to the inside of the furnace 2 for combustion.
  • the area inside the furnace 2 corresponding to the primary/concentrated pulverized coal nozzle 6 is a concentrated pulverized coal combustion zone
  • the area inside the furnace 2 corresponding to the primary/light pulverized coal nozzle 7 is a light pulverized coal combustion zone, the pulverized coal powder
  • the combustion zone is located above the concentrated pulverized coal combustion zone.
  • the ratio of the air-to-powder ratio and the primary air ratio of the concentrated primary air/pulverized coal is better than that of the intermediate storage and heating air.
  • the corresponding parameters of the powder feeding system at the same time, 50%-secondary wind containing half of the water is separated, and sent to the furnace 2 from the primary air/light coal powder nozzle 7 located in the upper part of the burner group, although the mixing temperature of the primary air powder The mixing temperature of the primary air powder is lower than that of the intermediate storage hot air feeding system.
  • the design shows that the heat of the concentrated coal powder is higher than that of the intermediate storage hot air feeding system. Basically the same, thus ensuring a stable ignition of the concentrated pulverized coal gas stream.

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

Abstract

A thick-thin coal dust separation and arrangement structure for a single-fireball eight-corner straight-flow burner, comprising a boiler body (1) provided with eight sets of burners (10) thereon; each water-cooled wall (9) is provided with two sets of burners (10) thereon; each set of burners (10) comprises a plurality of burners (10) with the same nozzle direction; the central lines of the nozzles on each of the eight groups of burners (10) are in the same tangential direction forming an imaginary tangential circle in the burner hearth. The eight groups of burners (10) are arranged on the four water-cooled walls (9) of the boiler, increasing the coal dust concentration in the thick coal dust area, making the heat load of the wall surface in the lower burner area higher; thus the burning temperature in the area achieves the stable combustion required for firing anthracite; the distance of a jet flow from a nozzle outlet to a downstream adjacent corner airflow is short, thus adopting a lower airflow speed of primary air coal dust; the heat flow intensity at the nozzle outlet is high, thus improving the amount of heat transfer via convection and radiation, and ensuring the timely firing of the anthracite coal dust flow and the stable combustion of the boiler in low load without oil.

Description

单火球八角直流燃烧器煤粉浓淡分离布置结构  Single fireball octagonal DC burner pulverized coal separation structure
技术领域  Technical field
本发明涉及一种属于煤粉燃烧装置的技术， 具体涉及一种燃用无烟煤的 单火球八角直流燃烧器煤粉浓淡分离布置结构。 背景技术  The invention relates to a technology belonging to a pulverized coal combustion device, in particular to a pulverized coal separation and arrangement structure of a single fireball octagonal direct current burner burning anthracite. Background technique
中国已探明的煤炭储量约为 6400亿吨，其中低挥发份无烟煤约占煤炭总 储量的 14.6%。我国火电厂燃用无烟煤约占发电用煤总量的 3%，这一数字还 在增加。 无烟煤的挥发份含量低， 含氢量低， 着火温度高， 火焰传播速度较 慢， 如燃烧组织得不好， 易发生低负荷燃烧不稳定， 煤质变差时锅炉高负荷 容易熄火的情况， 燃烧效率一般也较低。  China's proven coal reserves are about 640 billion tons, of which low-volatility anthracite accounts for about 14.6% of total coal reserves. The burning of anthracite in thermal power plants in China accounts for about 3% of the total coal used for power generation, and this figure is also increasing. Anthracite has low volatile content, low hydrogen content, high ignition temperature, and slow flame propagation. If the combustion structure is not good, it is prone to low-load combustion instability. When the coal quality deteriorates, the high load of the boiler is easily extinguished. The combustion efficiency is generally lower.
目前， 国内外燃用无烟煤采用 W火焰锅炉， 四角切向燃烧锅炉， 以及前 后墙对冲旋流燃烧锅炉。 W火焰锅炉最大容量为 600MW等级， 四角切向燃 烧锅炉以及前后墙对冲旋流燃烧锅炉最大容量为 300MW 等级， 还未有 600MW及以上等级的四角切向燃烧无烟煤锅炉的设计和运行业绩。  At present, the use of anthracite coal at home and abroad uses W flame boilers, four-corner tangentially fired boilers, and front and rear wall counter-rotating swirling combustion boilers. The maximum capacity of the W-fired boiler is 600MW. The maximum capacity of the four-corner tangentially fired boiler and the front and rear wall counter-rotating combustion boiler is 300MW. There is no design and operation performance of the four-corner tangentially-burning anthracite boiler of 600MW and above.
我国电站锅炉制造厂家从 70年代初开始设计、 制造专烧无烟煤的锅炉。 随着机组容量发展到 600MW〜1300MW 等级， 锅炉的炉膛热力参数较 125MW, 300MW无烟煤锅炉有较大变化， 首先是炉膛容积热负荷 qv降低， 煤粉在炉膛内停留时间延长， 有利于无烟煤的燃尽。 但同时燃烧器区域壁面 热负荷 q&降低， 虽然断面热负荷^有所升高， 但是总的燃烧器区域水冷壁 的吸热量是增加的， 导致燃烧器区域的温度水平下降， 对无烟煤的及时、 稳 定着火不利。 特别是容量增加到 800MW〜1300MW等级后， 由于受到单个 煤粉喷嘴热功率的限制，单台磨煤机对应的煤粉喷嘴的数量相对于 300MW〜 600MW锅炉需要增加 50%到 100%,由 4个增加到 6个或 8个。比如 1000MW 超超临界锅炉， 在配备 6台中速磨或双进双出磨煤机情况下， 单台磨煤机对 应的煤粉喷嘴的数量为 8个，总的煤粉喷嘴的数量达到 48个。在采用直流燃 烧器四角切圆布置的情况下，单角一次风煤粉喷嘴的数量为 12个，再加上燃 烧器在垂直方向上分为 2到 3组， 这样导致燃烧器最上和最下 2个一次风煤 粉喷嘴的间距较大， 燃烧器区域壁面热负荷 &较低， 该区域燃烧温度较低， 不利于无烟煤粉气流的及时、 稳定着火及锅炉不投油低负荷稳燃。 China's power station boiler manufacturers began designing and manufacturing boilers that burned anthracite coal from the early 1970s. With the capacity of the unit developed to 600MW~1300MW, the furnace heat parameters of the boiler are much larger than that of the 125MW, 300MW anthracite boiler. The first is that the furnace volume heat load q v is reduced, the residence time of the coal powder in the furnace is prolonged, which is beneficial to anthracite. Burn out. However, at the same time, the wall surface heat load q & is reduced, although the section heat load ^ is increased, but the total heat absorption of the water wall of the burner area is increased, resulting in a decrease in the temperature level of the burner area, for anthracite Timely and stable fire is not good. Especially after the capacity is increased to 800MW~1300MW, the number of pulverized coal nozzles corresponding to a single coal mill is 50% to 100% higher than that of a 300MW~600MW boiler due to the limitation of the thermal power of a single pulverized coal nozzle. Increase to 6 or 8. For example, in the case of a 1000 MW ultra-supercritical boiler, in the case of 6 medium-speed or double-input double-out coal mills, the number of pulverized coal nozzles for a single coal mill is 8 and the total number of pulverized coal nozzles is 48. . In the case of a four-corner tangential arrangement of a DC burner, the number of single-angle primary pulverized coal nozzles is twelve, and the burner is divided into two to three groups in the vertical direction, which results in the top and bottom of the burner. 2 PrimaryAir nozzle pitch is large, the burner zone wall heat load & low, low temperature combustion region, It is not conducive to the timely and stable ignition of the anthracite powder flow and the boiler does not oil and low load and stable combustion.
国内已经成功投运的大量 50MW、 125MW和 300MW无烟煤锅炉，几乎 全部采用中间仓储制热风送粉***， 该***一次风粉混合温度可高达 220〜 250° C, —次风比率 14〜15%， 并能够将含有水份的乏气从一次风中分离出 来， 从燃烧器上部送入炉膛， 从而减少煤粉着火热， 采用中间仓储制热风送 粉***， 是在 50〜300MW锅炉上成功燃用无烟煤的关键。 但是对于中间仓 储制热风送粉***， 由于国产钢球磨出力最大约为 50t/h， 对 600MW及以上 机组，每台炉要布置 6〜8台磨，该***本身较为复杂，再加上庞大的煤粉仓， 使得设计院设计布置较为困难， 占地也较大。因此在机组容量增大到 600MW 后， 一般不再推荐采用该***。  A large number of 50MW, 125MW and 300MW anthracite boilers that have been successfully put into operation in China, almost all adopt the intermediate storage and hot air feeding system. The primary air powder mixing temperature can reach 220~250° C, and the secondary air ratio is 14~15%. It can separate the waste gas containing water from the primary air, and send it into the furnace from the upper part of the burner to reduce the heat of the coal powder. The intermediate storage hot air feeding system is successfully used on the 50~300MW boiler. The key to anthracite. However, for the intermediate storage hot air powder feeding system, since the domestic steel ball grinding force is about 50t/h at most, for the 600MW and above units, each furnace should be arranged with 6~8 sets of grinding, the system itself is more complicated, plus a huge The pulverized coal bin makes the design and layout of the design institute more difficult and covers a large area. Therefore, after the unit capacity has increased to 600 MW, the system is generally no longer recommended.
如图 1和图 2所示， 图中以 1000MW超超临界塔式锅炉为例， 说明了现 有的燃烧器切圆布置方式。 图 2为图 1的 Π - Π剖视图， 图 1为图 2的 I - I 剖视图。 该种布置方式包括锅炉本体 1， 炉膛 2， 磨煤机 3， 煤粉管道 4， 一 次风煤粉喷嘴 5及二次风喷嘴 6。每台锅炉 1配置六台磨煤机 3，编号分别为 A、 B、 C、 D、 E、 F。 炉膛 2由四面水冷壁 7组成， 在炉膛 2的每个角上布 置有一组燃烧器 8， 四角燃烧器 8的喷嘴中心线在炉膛 2内形成假想切圆 9。 每组燃烧器 8沿垂直方向又分为三组小的燃烧器， 中间隔开一定的距离， 每 组小的燃烧器由四个一次风煤粉喷嘴 5及六个二次风喷嘴 6组成， 即垂直方 向间隔布置 12个一次风煤粉喷嘴 5及 18个二次风喷嘴 6，如 1号角 12个一 次风煤粉喷嘴 5 的编号为 A1-1 , Al-2, Bl-1 , Bl-2, C1-1 , Cl-2, D1-1 , Dl-2, E1-1 , El-2, F1-1 , F1-2, 4号角 12个一次风煤粉喷嘴 5的编号为 A4-1 , A4-2, B4-1 , B4-2, C4-1 , C4-2, D4-1 , D4-2, E4-1 , E4-2, F4-l， F4-2。 磨煤机 3通过煤粉管道 4与一次风煤粉喷嘴 5相连接， 每台磨煤机 3出口有 四根煤粉管道 4，每根煤粉管道 4通过一个煤粉分配器 10与同一个角相邻标 高的 2个一次风煤粉喷嘴 5连接， 比如编号为 A的磨煤机 3与编号为 A1-1 , Al-2, A2-1 , A2-2, A3-1 , A3-2, A4-1 , A4-2共八个一次风煤粉喷嘴 5连 接。可见，由于每组燃烧器 8沿垂直方向间隔布置有 12个一次风煤粉喷嘴 5， 该布置方式燃烧器区域壁面热负荷 q&较低， 不能适应无烟煤燃烧的要求。 发明内容 本发明提供了一种单火球八角直流燃烧器煤粉浓淡分离布置结构， 实现 产生较高的燃烧器区域壁面热负荷 q&。 As shown in Fig. 1 and Fig. 2, the 1000MW ultra-supercritical tower boiler is taken as an example to illustrate the existing rounding arrangement of the burner. Fig. 2 is a cross-sectional view taken along line Π - Π of Fig. 1, and Fig. 1 is a cross-sectional view taken along line I - I of Fig. 2. This arrangement includes a boiler body 1, a furnace 2, a coal mill 3, a pulverized coal pipe 4, a primary pulverized coal nozzle 5 and a secondary air nozzle 6. Each boiler 1 is equipped with six coal mills 3, numbered A, B, C, D, E, F. The grate 2 consists of a four-sided water wall 7, on each corner of which a set of burners 8 are arranged, the nozzle centerline of which forms an imaginary cut circle 9 in the furnace 2. Each group of burners 8 is further divided into three groups of small burners in the vertical direction, separated by a certain distance. Each group of small burners is composed of four primary air pulverized coal nozzles 5 and six secondary air nozzles 6. That is, 12 primary air pulverized coal nozzles 5 and 18 secondary air nozzles 6 are arranged at intervals in the vertical direction. For example, 12 primary air pulverized coal nozzles 5 of No. 1 angle are numbered A1-1, Al-2, Bl-1, Bl-. 2, C1-1, Cl-2, D1-1, Dl-2, E1-1, El-2, F1-1, F1-2, No. 4 corner 12 primary air pulverized coal nozzle No. 5 is numbered A4-1 , A4-2, B4-1, B4-2, C4-1, C4-2, D4-1, D4-2, E4-1, E4-2, F4-l, F4-2. The coal mill 3 is connected to the primary pulverized coal nozzle 5 through the pulverized coal pipe 4, and each pulverized coal machine 3 outlet has four pulverized coal pipes 4, each of which passes through a pulverized coal distributor 10 and the same Two primary air pulverized coal nozzles 5 adjacent to the elevation are connected, such as the coal mill 3 numbered A and numbered A1-1, Al-2, A2-1, A2-2, A3-1, A3-2 , A4-1, A4-2 a total of eight primary air pulverized coal nozzles 5 connection. It can be seen that since each group of burners 8 is arranged with 12 primary air pulverized coal nozzles 5 arranged in the vertical direction, the wall surface heat load q &> of the arrangement burner area is low, and cannot meet the requirements of anthracite combustion. Summary of the invention The invention provides a single fireball octagonal direct current burner pulverized coal separation and arrangement structure, which realizes a high wall heat load q & of the burner region.
为实现上述目的， 本发明提供了一种单火球八角直流燃烧器煤粉浓淡分 离布置结构， 该结构包含：  In order to achieve the above object, the present invention provides a single fireball octagonal direct current burner pulverized coal ash separation structure, the structure comprising:
锅炉本体， 其由四面水冷壁围绕组成， 四面水冷壁围绕设置所形成的内 部空间为锅炉本体的炉膛；  a boiler body, which is composed of a four-sided water-cooling wall, and the inner wall formed by the four-sided water-cooling wall is a furnace body of the boiler body;
若干个燃烧器， 其分别设置在水冷壁上， 并穿过水冷壁与炉膛连通； 燃 烧器上设有朝向炉膛内设置的喷嘴；  a plurality of burners respectively disposed on the water wall and communicating with the furnace through the water wall; the burner is provided with a nozzle disposed in the furnace;
煤粉管道；  Pulverized coal pipeline;
浓淡分离器， 其通过煤粉管道分别与若干个燃烧器连接； 以及， 若干磨煤机， 其通过煤粉管道与浓淡分离器连接；  a concentration separator, which is respectively connected to a plurality of burners through a pulverized coal pipeline; and, a plurality of coal mills, which are connected to the rich and light separator through a pulverized coal pipeline;
每台锅炉本体至少设有一台磨煤机；  At least one coal mill is provided for each boiler body;
其特点是， 上述的锅炉本体上设有八个燃烧器组， 每个水冷壁上各设有 两个燃烧器组， 每个燃烧器组中包含有若干个喷嘴朝向相同的燃烧器， 八个 燃烧器组上各喷嘴的中心线在炉膛内形成一个假想切圆。  The utility model is characterized in that: the above boiler body is provided with eight burner groups, each of which is provided with two burner groups, each burner group containing a plurality of nozzles facing the same burner, eight The centerline of each nozzle on the burner block forms an imaginary tangent circle in the furnace.
上述的锅炉本体四面水冷壁分别设为锅炉本体的前墙、 后墙、 左恻墙和 右恻墙， 前墙与后墙相对设置， 左恻墙与右恻墙相对设置； 设置在前墙或后 墙上燃烧器喷嘴的中心线与其所设处的水冷壁相交于一交点， 该交点距离最 近的相邻水冷壁连接处的距离为 Ll， l/10Lw^L1 ^4/10Lw, Lw为锅炉本体 前墙与后墙之间的距离。  The water-cooling walls on the four sides of the boiler body are respectively set as the front wall, the rear wall, the left wall and the right wall of the boiler body, and the front wall and the rear wall are oppositely disposed, and the left wall and the right wall are oppositely disposed; The center line of the burner nozzle on the rear wall intersects with the water wall where it is located at an intersection, the distance from the nearest adjacent water wall connection is Ll, l/10Lw^L1 ^4/10Lw, Lw is the boiler The distance between the front wall and the back wall of the body.
设置在左恻墙或右恻墙上燃烧器的喷嘴的中心线与其所设处的水冷壁相 交于一交点， 该交点距离最近的相邻水冷壁连接处的距离为 L2， l/10Ld^L2 ^4/10Ld, Ld为锅炉本体左恻墙和右恻墙之间的距离。  The center line of the nozzle of the burner disposed on the left or right wall of the wall intersects with the water wall where it is located at an intersection, the distance from the nearest adjacent water wall connection is L2, l/10Ld^L2 ^4/10Ld, Ld is the distance between the left and right wall of the boiler body.
燃烧器喷嘴的中心线与其所设处的水冷壁相交于一交点， 以该交点与假 想切圆的圆心连成一直线， 该直线与该燃烧器喷嘴的中心线之间设有夹角 a, 0。 ^a^30° 。  The center line of the burner nozzle intersects with the water-cooling wall where it is located at an intersection, and the intersection is connected with the center of the imaginary tangential circle, and the line is provided with an angle a, 0 between the line of the burner nozzle and the center line of the burner nozzle. . ^a^30°.
每个上述的燃烧器组沿垂直方向分为两个小组， 该两小组分别为第一燃 烧器小组和第二燃烧器小组， 第一燃烧器小组设置在水冷壁的下部， 第二燃 烧器小组设置在水冷壁的上部。  Each of the above burner groups is divided into two groups in a vertical direction, the two groups being a first burner group and a second burner group, respectively, the first burner group is disposed at a lower portion of the water wall, and the second burner group Set on the upper part of the water wall.
上述的第一燃烧器小组包含一次风 /浓煤粉燃烧器， 该一次风 /浓煤粉燃 烧器上沿垂直方向至少设置有一个一次风 /浓煤粉喷嘴和两个二次风喷嘴，该 一次风 /浓煤粉喷嘴与二次风喷嘴一一间隔设置。 The first burner group described above comprises a primary air/concentrated pulverized coal burner, the primary air/rich pulverized coal combustion At least one primary air/concentrated coal powder nozzle and two secondary air nozzles are disposed on the burner in a vertical direction, and the primary air/concentrated coal powder nozzle is spaced apart from the secondary air nozzle.
上述的第二燃烧器小组包含一次风 /淡煤粉燃烧器， 该一次风 /淡煤粉燃 烧器上沿垂直方向至少设置有一个一次风 /淡煤粉喷嘴和两个二次风喷嘴，该 一次风 /淡煤粉喷嘴与二次风喷嘴一一间隔设置。  The second burner group includes a primary air/light coal powder burner, and the primary air/light coal powder burner is provided with at least one primary/light coal powder nozzle and two secondary air nozzles in a vertical direction, The primary air/light coal powder nozzle is arranged at intervals from the secondary air nozzle.
每台上述的磨煤机的出口连接有若干根煤粉管道， 每根煤粉管道通过所 浓淡分离器分为浓煤粉管道和淡煤粉管道。  A plurality of pulverized coal pipes are connected to the outlet of each of the above coal mills, and each pulverized coal pipe is divided into a concentrated pulverized coal pipe and a light pulverized coal pipe by the rich and light separator.
上述的浓煤粉管道上设有煤粉分配器， 并通过煤粉分配器分为若干根细 的浓煤粉管道， 分别与若干个所述的一次风 /浓煤粉喷嘴连接；  The above-mentioned concentrated coal powder pipeline is provided with a coal powder distributor, and is divided into a plurality of thin concentrated coal powder pipelines through the coal powder distributor, and is respectively connected with a plurality of said primary air/concentrated coal powder nozzles;
上述的淡煤粉管道上设有煤粉分配器， 并通过煤粉分配器分为若干根细 的淡煤粉管道， 分别与若干个一次风 /淡煤粉喷嘴连接。  The above-mentioned pulverized coal powder pipeline is provided with a coal powder distributor, and is divided into a plurality of fine pulverized coal powder pipelines through the pulverized coal distributor, and is respectively connected with a plurality of primary air/light coal powder nozzles.
设置在最上部的上述一次风 /淡煤粉喷嘴与设置在最下部的上述一次风 / 浓煤粉喷嘴之间的间距在 1米至 2米之间。  The distance between the above-mentioned primary air/light coal powder nozzle disposed at the uppermost portion and the above-mentioned primary air/concentrated coal powder nozzle disposed at the lowermost portion is between 1 m and 2 m.
本发明单火球八角直流燃烧器煤粉浓淡分离布置结构和现有技术相比， 其优点在于：  Compared with the prior art, the single fireball octagonal direct current burner pulverized coal separation and arrangement structure has the advantages of:
1、 本发明通过每台磨煤机出口的煤粉气流与同一层共 8只浓一次风 /煤 粉喷嘴， 以及同一层共 8只淡一次风 /煤粉喷嘴相连接的布置方式， 在满足整 台锅炉热功率的前提下， 增加了浓煤粉区域的煤粉浓度， 使下部燃烧器区域 壁面热负荷 qHr较高， 该区域燃烧温度能达到无烟煤着火稳燃的要求， 保证 无烟煤粉气流的及时着火及锅炉不投油低负荷稳燃；  1. The pulverized coal gas flow at the outlet of each coal mill is connected with 8 concentrated primary air/pulverized coal nozzles on the same layer, and 8 light primary air/pulverized coal nozzles in the same layer are arranged. Under the premise of the whole boiler's thermal power, the concentration of pulverized coal in the concentrated pulverized coal area is increased, so that the wall heat load qHr of the lower burner area is higher. The combustion temperature in this area can meet the requirements of anthracite ignition and stable combustion, and the anthracite powder flow is guaranteed. Timely fire and the boiler does not oil and low load steady combustion;
2、八组燃烧器布置在锅炉四面水冷壁墙上，与四组燃烧器布置在四角相 比， 射流两恻的补气条件较好， 不容易发生一次风煤粉贴墙的现象， 有利于 防止炉膛结渣和高温腐蚀， 煤种变化的适应性较好；  2. The eight groups of burners are arranged on the water wall of the four sides of the boiler. Compared with the four groups of burners arranged at the four corners, the air supply conditions of the two jets are better, and it is not easy to occur once the wind coal powder is attached to the wall. To prevent furnace slagging and high temperature corrosion, the adaptability of coal type changes is better;
3、八组燃烧器布置在锅炉四面水冷壁墙上，与四组燃烧器布置在四角相 比， 射流从喷嘴出口到达下游邻角气流的距离较短， 这样可以采用较低的一 次风煤粉气流速度， 有利于无烟煤粉气流的及时着火及锅炉不投油低负荷稳 燃， 二次风速度也可降低， 有利于降低火球的残余旋流强度和炉膛出口的烟 温偏差；  3. Eight sets of burners are arranged on the water wall of the four sides of the boiler. Compared with the four sets of burners arranged at the four corners, the distance from the nozzle exit to the downstream adjacent airflow is shorter, so that a lower primary pulverized coal powder can be used. The airflow speed is beneficial to the timely ignition of the anthracite powder airflow and the boiler does not oil and low-load stable combustion, and the secondary air velocity can also be reduced, which is beneficial to reducing the residual swirling intensity of the fireball and the smoke temperature deviation of the furnace outlet;
4、八组燃烧器布置在锅炉本体的四面水冷壁墙上，与四组燃烧器布置在 四角相比， 喷嘴出口处的热流强度较高， 通过对流和辐射换热量大大提高， 有利于无烟煤粉气流的及时着火及锅炉不投油低负荷稳燃； 4. The eight groups of burners are arranged on the four-sided water-cooled wall of the boiler body. Compared with the four sets of burners arranged at the four corners, the heat flow intensity at the nozzle outlet is higher, and the amount of heat exchange by convection and radiation is greatly improved. Conducive to the timely ignition of the anthracite powder flow and the boiler does not oil and low load stable combustion;
5、 燃烧器最上部的一次风 /淡煤粉喷嘴和最下部的一次风 /浓煤粉喷嘴的 间距控制在 1到 2m内， 在同样满足最上的一次风煤粉喷嘴到炉膛出口屏底 间距和无烟煤燃烧效率的前提下， 使得锅炉的总高度减少， 大大降低了锅炉 的制造成本， 同时降低了锅炉氮氧化物的排放量。 附图说明  5. The distance between the primary air/light coal powder nozzle at the top of the burner and the primary air/concentrated coal powder nozzle at the lowermost level is controlled within 1 to 2 m, which also satisfies the spacing of the top air pulverized coal nozzle to the bottom of the furnace outlet. Under the premise of burning efficiency of anthracite, the total height of the boiler is reduced, the manufacturing cost of the boiler is greatly reduced, and the emission of nitrogen oxides of the boiler is reduced. DRAWINGS
图 1为现有技术燃烧器布置方式的示意图， 为图 2的 I - I剖视图； 图 2为现有技术燃烧器布置方式的示意图， 为图 1的 Π - Π剖视图； 图 3为本发明单火球八角直流燃烧器煤粉浓淡分离布置结构的带煤粉浓 淡分离装置的中速磨或双进双出直吹式制粉***的结构示意图；  BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a prior art burner arrangement, which is a cross-sectional view taken along line I - I of Fig. 2; Fig. 2 is a schematic view showing a prior art burner arrangement, which is a cross-sectional view of Fig. 1; Schematic diagram of medium-speed grinding or double-inlet and double-out direct-blowing pulverizing system with pulverized coal concentration separation device for fire ball octagonal direct current burner pulverized coal separation and arrangement;
图 4为本发明单火球八角直流燃烧器煤粉浓淡分离布置结构的示意图， 为图 5的 I - I剖视图；  4 is a schematic view showing a structure of separation and arrangement of pulverized coal of a single fireball octagonal direct current burner according to the present invention, which is a cross-sectional view taken along line I - I of FIG. 5;
图 5为本发明单火球八角直流燃烧器煤粉浓淡分离布置结构的示意图， 为图 4的 Π - Π剖视图。 具体实 式  Fig. 5 is a schematic view showing the structure of the separation and arrangement of the pulverized coal of the single fireball octagonal direct current burner according to the present invention, which is a cross-sectional view of the Π-Π of Fig. 4. Specific form
以下结合附图说明本发明的具体实施方式。  Specific embodiments of the present invention will be described below with reference to the accompanying drawings.
如图 4所示， 公开了一种燃用无烟煤的单火球八角直流燃烧器煤粉浓淡 分离布置结构的实施例。 每台锅炉包含有一个锅炉本体 1， 该锅炉本体 1包 含 4面水冷壁 9，该 4面水冷壁 9环绕设置围成了锅炉本体 1，该 4面水冷壁 9围成的内部空间即形成锅炉本体 1的炉膛 2。 该炉膛 2的深度为 Ld， 炉膛 2的宽度为 Lw。每个锅炉本体 1上设有 8个燃烧器组， 该八个燃烧器组分别 设置在锅炉本体 1的 4面水冷壁 9上， 每面水冷壁 9上设有两个燃烧器组， 每个燃烧器组里包含有若干垂直排列设置的燃烧器 10。该八个燃烧器组以炉 膛 2的中心为中心环绕设置，其两两之间间隔角度相同。每个燃烧器 10上都 设有喷嘴， 同一个燃烧器组中， 燃烧器 10的喷嘴的方向相同， 八个燃烧器组 内燃烧器 10的喷嘴都朝向炉膛 2内部设置，八个燃烧器组上各个喷嘴的中心 线 （即八个燃烧器组上各个喷嘴的喷射方向） 在炉膛 2的内部中心以逆时针 方向 （在俯视的形状下为逆时针方向） 形成假想切圆 11， 该假想切圆 11 的 圆心与炉膛 2的中心重合。 As shown in FIG. 4, an embodiment of a single fireball octagonal direct current burner pulverized coal separation structure for burning anthracite is disclosed. Each boiler comprises a boiler body 1 comprising a four-sided water-cooling wall 9 surrounded by a boiler body 1 and an internal space enclosed by the four-side water-cooling wall 9 forms a boiler Furnace 2 of the body 1. The depth of the furnace 2 is Ld, and the width of the furnace 2 is Lw. Each of the boiler bodies 1 is provided with eight burner groups, which are respectively disposed on the four-side water-cooling wall 9 of the boiler body 1, and each of the water-cooling walls 9 is provided with two burner groups, each of which is provided with two burner groups. The burner group contains a plurality of burners 10 arranged vertically. The eight burner groups are circumferentially centered around the center of the furnace 2, and the angle between them is the same. Each of the burners 10 is provided with nozzles. In the same burner group, the nozzles of the burners 10 are oriented in the same direction, and the nozzles of the burners 10 in the eight burner groups are disposed toward the inside of the furnace 2, and eight burner groups are provided. The center line of each of the upper nozzles (i.e., the ejection direction of each nozzle on the eight burner groups) forms an imaginary tangential circle 11 in a counterclockwise direction (counterclockwise in a plan view shape) at the inner center of the furnace 2, the imaginary cut Round 11 The center of the circle coincides with the center of the furnace 2.
各个燃烧器 10的喷嘴的中心线与该燃烧器 10相对应的水冷壁 9相交于 一个交点， 该交点与假想切圆 11 的圆心连接形成一直线， 该直线与燃烧器 10的喷嘴的中心线之间呈一夹角 a， 该夹角 a的大小的取值范围是 0° ^a^ 30° 。 本实施例中该夹角 a的大小取为 4度， SP : a=4° 。  The center line of the nozzle of each burner 10 intersects the water-cooling wall 9 corresponding to the burner 10 at an intersection which is connected to the center of the imaginary tangential circle 11 to form a straight line which is the center line of the nozzle of the burner 10. There is an angle a between the angle a, and the range of the angle a is 0 ° ^ a ^ 30 °. In this embodiment, the angle a is taken as 4 degrees, and SP: a = 4°.
锅炉本体 1的 4面水冷壁 9中相对的两面水冷壁 9为锅炉本体 1的前墙 和后墙， 另一对相对的两面水冷壁 9为锅炉本体 1左恻墙和右恻墙， 锅炉本 体 1的前墙与后墙之间的距离为炉膛 2的深度 Ld，锅炉本体 1的左恻墙和右 恻墙之间的距离为炉膛 2的宽度 Lw。  The opposite two-side water-cooling wall 9 of the four-side water-cooling wall 9 of the boiler body 1 is the front wall and the rear wall of the boiler body 1, and the other pair of opposite two-side water-cooling walls 9 are the left and right wall of the boiler body 1, the boiler body The distance between the front wall and the rear wall of 1 is the depth Ld of the furnace 2, and the distance between the left and right wall of the boiler body 1 is the width Lw of the furnace 2.
分别布置在锅炉本体 1前墙或后墙上的燃烧器 10的喷嘴的中心线与该燃 烧器 10所设位置的水冷壁 9相交于一个交点，该交点距离最近的炉膛 2的棱 角处（该棱角处为相邻两面水冷壁 9之间的连接处） 的距离 L1 , 其取值范围 是 l/10Lw Ll 4/10 Lw。本实施例中 L1取为炉膛 2的宽度 Lw的四分之一， 即： Ll=l/4Lw。  The center line of the nozzle of the burner 10 respectively disposed on the front wall or the rear wall of the boiler body 1 intersects the water-cooling wall 9 at the position where the burner 10 is disposed at an intersection point which is away from the corner of the nearest furnace 2 (this The distance between the corners is the junction between the adjacent two water-cooling walls 9), which is in the range of l/10Lw Ll 4/10 Lw. In the present embodiment, L1 is taken as one quarter of the width Lw of the furnace 2, that is, L1 = 1/4 Lw.
同样，布置在锅炉本体 1左恻墙和右恻墙上的燃烧器 10的喷嘴的中心线 与该燃烧器 10所设位置的水冷壁 9相交于一个交点。该交点距离最近的炉膛 2的棱角处 （该棱角处为相邻两面水冷壁 9之间的连接处） 的距离 L2， 其取 值范围是 l/10Ld L2 4/10Ld。本实施例中 L2取为炉膛 2的深度 Ld的四分 之一， 即： L2=l/4Ld。  Similarly, the center line of the nozzle of the burner 10 disposed on the left and right wall of the boiler body 1 intersects the water-cooling wall 9 at the position where the burner 10 is disposed at an intersection. The intersection is located at a distance L2 from the corner of the nearest furnace 2, which is the junction between adjacent water-cooling walls 9, and has a value in the range of l/10Ld L2 4/10Ld. In the present embodiment, L2 is taken as one quarter of the depth Ld of the furnace 2, that is, L2 = l/4 Ld.
如图 5并结合图 4所示， 每个燃烧器组在垂直方向上分为两个小组， 该 两组分别为第一燃烧器小组和第二燃烧器小组， 第一燃烧器小组设置在锅炉 本体 1恻壁的下部， 第二燃烧器小组设置在锅炉本体 1恻壁的上部。  As shown in FIG. 5 and in conjunction with FIG. 4, each burner group is divided into two groups in a vertical direction, the two groups being a first burner group and a second burner group, respectively, and the first burner group is disposed in the boiler. The lower portion of the body 1 wall, the second burner group is disposed at the upper portion of the wall of the boiler body 1.
第一燃烧器小组中的燃烧器 10为一次风 /浓煤粉燃烧器， 该一次风 /浓煤 粉燃烧器上都设有喷嘴， 喷嘴按照上述的结构要求朝向炉膛 2内部设置， 并 与炉膛内部连通。该设置在一次风 /浓煤粉燃烧器上的喷嘴包含有六个一次风 /浓煤粉喷嘴 6和七个二次风喷嘴 8，每个一次风 /浓煤粉喷嘴 6间隔设置在两 个相邻的二次风喷嘴 8之间。  The burner 10 in the first burner group is a primary air/concentrated pulverized coal burner, and the primary air/concentrated pulverized coal burner is provided with nozzles, and the nozzles are arranged toward the inside of the furnace 2 according to the above structural requirements, and the furnace Internal connectivity. The nozzle disposed on the primary air/concentrated pulverized coal burner comprises six primary/concentrated pulverized coal nozzles 6 and seven secondary air nozzles 8, each of which is disposed at two intervals. Between adjacent secondary air nozzles 8.
各个二次风喷嘴 8都通过管路连接二次风大风箱， 该二次风大风箱连接 外接的二次风管道。 为了保证燃烧的完全， 通过二次风喷嘴 8向锅炉内加入 二次风。 布置在前墙的两个燃烧器组的一次风 /浓煤粉燃烧器上的十二个一次风 / 浓煤粉喷嘴 6的编号分别为 A1-1-1 , Al-1-2, B1-1-1 , Bl-1-2, C1-1-1 , C1-1-2, Dl-1-1 , Dl-1-2, El-1-1 , El-1-2, Fl-1-1 , Fl-l-2。 布置在后墙的两个燃烧 器组的一次风 /浓煤粉燃烧器上的十二个一次风 /浓煤粉喷嘴 6 的编号分别为 A3-1-1 , A3-1-2, B3-1-1 , B3-1-2, C3-1-1 , C3-1-2, D3-1-1 , D3-1-2, E3-1-1 , E3-1-2, F3-1-1 , F3-l-2o布置在左恻墙的两个燃烧器组的一次风 /浓煤粉燃烧 器上的十二个一次风 /浓煤粉喷嘴 6的编号分别为 A2-1-1 , A2-1-2, B2-1-1 , B2-1-2, C2-1-1 , C2-1-2, D2-1-1 , D2-1-2, E2-1-1 , E2-1-2, F2-1-1 , F2-l-2。 布置在右恻墙的两个燃烧器组的一次风 /浓煤粉燃烧器上的十二个一次风 /浓 煤粉喷嘴 6的编号分别为 A4-1-1 , A4-1-2, B4-1-1 , B4-1-2, C4-1-1 , C4-1-2, D4-1-1 , D4-1-2, E4-1-1 , E4-1-2, F4-1-1 , F4-l-2。 Each of the secondary air nozzles 8 is connected to the secondary air large wind box through a pipeline, and the secondary air large wind box is connected to the external secondary air duct. In order to ensure complete combustion, secondary air is introduced into the boiler through the secondary air nozzle 8. The twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the front wall are numbered A1-1-1, Al-1-2, B1- 1-1, Bl-1-2, C1-1-1, C1-1-2, Dl-1-1, Dl-1-2, El-1-1, El-1-2, Fl-1- 1, Fl-l-2. The twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the rear wall are numbered A3-1-1, A3-1-2, B3- 1-1, B3-1-2, C3-1-1, C3-1-2, D3-1-1, D3-1-2, E3-1-1, E3-1-2, F3-1- 1 , F3-l-2o The twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the left wall are numbered A2-1-1, respectively. A2-1-2, B2-1-1, B2-1-2, C2-1-1, C2-1-2, D2-1-1, D2-1-2, E2-1-1, E2- 1-2, F2-1-1, F2-l-2. The twelve primary/rich pulverized coal nozzles 6 on the primary/rich pulverized coal burners of the two burner groups arranged on the right wall are numbered A4-1-1, A4-1-2, B4, respectively. -1-1, B4-1-2, C4-1-1, C4-1-2, D4-1-1, D4-1-2, E4-1-1, E4-1-2, F4-1 -1 , F4-l-2.
其中，编号为 A1-1-K Al-l-2、 A3-l-l、 A3-l-2、 A2-1-K A2-l-2、 A4-l-l、 A4-1-2的一次风 /浓煤粉喷嘴 6相对应地设置在同一水平面上，为同一层的喷 嘴。编号为 Bl-1-1、 Bl-l-2、 B3-1-K B3-l-2、 B2-1-K B2-l-2、 B4-1-K B4-1-2 的一次风 /浓煤粉喷嘴 6相对应地设置在同一水平面上， 为同一层的喷嘴。编 号为 Cl-1-1、 Cl-l-2、 C3-l-l、 C3-l-2、 C2-l-l、 C2-l-2、 C4-l-l、 C4-1-2的 一次风 /浓煤粉喷嘴 6相对应地设置在同一水平面上， 为同一层喷嘴。编号为 D1-1-K Dl-l-2、 D3-l-l、 D3-l-2、 D2-l-l、 D2-l-2、 D4-l-l、 D4-1-2的一次 风 /浓煤粉喷嘴 6 相对应地设置在同一水平面上， 为同一层喷嘴。 编号为 E1-1-K El-l-2、 E3-l-l、 E3-l-2、 E2-l-l、 E2-l-2、 E4-l-l、 E4-1-2的一次风 /浓煤粉喷嘴 6相对应地设置在同一水平面上，为同一层喷嘴。编号为 Fl-1-1、 ¥1-1-2, F3-l-l、 F3-l-2、 F2-l-l、 ¥2-1-2, F4-l-l、 F4-1-2 的一次风 /浓煤粉 喷嘴 6相对应地设置在同一水平面上， 为同一层喷嘴。  Among them, the first wind/concentration numbered A1-1-K Al-l-2, A3-ll, A3-l-2, A2-1-K A2-l-2, A4-ll, A4-1-2 The pulverized coal nozzles 6 are correspondingly disposed on the same horizontal surface and are nozzles of the same layer. Primary winds numbered Bl-1-1, Bl-l-2, B3-1-K B3-l-2, B2-1-K B2-l-2, B4-1-K B4-1-2 The concentrated coal powder nozzles 6 are correspondingly disposed on the same horizontal surface and are nozzles of the same layer. Primary/rich pulverized coal with numbers Cl-1-1, Cl-l-2, C3-ll, C3-l-2, C2-ll, C2-l-2, C4-ll, C4-1-2 The nozzles 6 are correspondingly disposed on the same horizontal surface and are the same layer of nozzles. Primary/rich pulverized coal nozzles numbered D1-1-K Dl-l-2, D3-ll, D3-l-2, D2-ll, D2-l-2, D4-ll, D4-1-2 The 6 phases are correspondingly set on the same horizontal surface and are the same layer of nozzles. Primary/rich pulverized coal nozzles numbered E1-1-K El-l-2, E3-ll, E3-l-2, E2-ll, E2-l-2, E4-ll, E4-1-2 6 correspondingly set on the same level, the same layer of nozzles. One wind/concentration numbered Fl-1-1, ¥1-1-2, F3-ll, F3-l-2, F2-ll, ¥2-1-2, F4-ll, F4-1-2 The pulverized coal nozzles 6 are correspondingly disposed on the same horizontal surface and are the same layer of nozzles.
第二小组燃烧器小组中的燃烧器 10为一次风 /淡煤粉燃烧器， 该一次风 / 淡煤粉燃烧器上都设有喷嘴，喷嘴按照上述的结构要求朝向炉膛 2内部设置， 并与炉膛内部连通。该设置在一次风 /淡煤粉燃烧器上的喷嘴包含六个一次风 /淡煤粉喷嘴 7和七个二次风喷嘴 8，每个一次风 /淡煤粉喷嘴 7间隔设置在两 个相邻的二次风喷嘴 8之间。  The burner 10 in the second group of burner groups is a primary air/light coal powder burner, and the primary air/light coal powder burner is provided with nozzles, and the nozzles are arranged toward the inside of the furnace 2 according to the above structural requirements, and The inside of the furnace is connected. The nozzle disposed on the primary air/pale pulverized coal burner comprises six primary/fresh pulverized coal nozzles 7 and seven secondary air nozzles 8, each of which is arranged at two intervals. Between adjacent secondary air nozzles 8.
各个二次风喷嘴 8都通过管路连接二次风大风箱， 该二次风大风箱连接 外接的二次风管道。 为了保证燃烧的完全， 通过二次风喷嘴 8向锅炉内加入 二次风。 Each of the secondary air nozzles 8 is connected to the secondary air large wind box through a pipeline, and the secondary air large wind box is connected to the external secondary air duct. In order to ensure the complete combustion, the secondary air nozzle 8 is added to the boiler. Second wind.
布置在前墙的两个燃烧器组的一次风 /淡煤粉燃烧器上的十二个一次风 / 淡煤粉喷嘴 7的编号为 A1-2-1 , Al-2-2, B1-2-1 , Bl-2-2, C1-2-1 , C1-2-2, Dl-2-1 , Dl-2-2, El-2-1 , El-2-2, Fl-2-1 , Fl-2-2。 布置在后墙的两个燃烧 器组的一次风 /淡煤粉燃烧器上的十二个一次风 /淡煤粉喷嘴 7 的编号为 A3-2-1 , A3-2-2, B3-2-1 , B3-2-2, C3-2-1 , C3-2-2, D3-2-1 , D3-2-2, E3-2-1 , E3-2-2, F3-2-1 , F3-2-2。布置在左恻墙的两个燃烧器组的一次风 /淡煤粉燃烧 器上的十二个一次风 /淡煤粉喷嘴 7的编号为 A2-2-1 , Α2-2-2，Β2-2-1，Β2-2-2， C2-2-1 , C2-2-2, D2-2-1 , D2-2-2, E2-2-1 , E2-2-2, F2-2-1 , ¥2-2-20 布置在 右恻墙的两个燃烧器组的一次风 /淡煤粉燃烧器上的十二个一次风 /淡煤粉喷 嘴 7的编号为 A4-2-1 , A4-2-2, B4-2-1 , B4-2-2, C4-2-1 , C4-2-2, D4-2-1 , D4-2-2, E4-2-1 , E4-2-2, F4-2-1 , F4-2-2。 The twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the front wall are numbered A1-2-1, Al-2-2, B1-2 -1 , Bl-2-2, C1-2-1, C1-2-2, Dl-2-1, Dl-2-2, El-2-1, El-2-2, Fl-2-1 , Fl-2-2. The twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the rear wall are numbered A3-2-1, A3-2-2, B3-2 -1, B3-2-2, C3-2-1, C3-2-2, D3-2-1, D3-2-2, E3-2-1, E3-2-2, F3-2-1 , F3-2-2. The twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the left wall are numbered A2-2-1, Α2-2-2, Β2- 2-1, Β2-2-2, C2-2-1, C2-2-2, D2-2-1, D2-2-2, E2-2-1, E2-2-2, F2-2- 1 , ¥2-2-2 0 Twelve primary/pale pulverized coal nozzles 7 on the primary/light pulverized coal burners of the two burner groups arranged on the right wall are numbered A4-2-1 , A4-2-2, B4-2-1, B4-2-2, C4-2-1, C4-2-2, D4-2-1, D4-2-2, E4-2-1, E4 -2-2, F4-2-1, F4-2-2.
其中，编号为 A1-2-K Al-2-2、 A3-2-K A3-2-2、 A2-2-K A2-2-2、 A4-2-l、 A4-2-2的一次风 /淡煤粉喷嘴 7相对应地设置在同一水平面上的同一层。编号 为 Bl-1-1、 Bl-l-2、 B3-l-l、 B3-l-2、 B2-1-K B2-l-2、 B4-l-l、 B4-1-2的一 次风 /淡煤粉喷嘴 7相对应地设置在同一水平面上的同一层。 编号为 Cl-1-1、 Cl-l-2、 C3-l-l、 C3-l-2、 C2-l-l、 C2-l-2、 C4-l-l、 C4- 1-2的一次风 /淡煤粉 喷嘴 7 相对应地设置在同一水平面上的同一层。 编号为 Dl-1-1、 D1-1-2, D3-l-l、 D3-l-2、 D2-1-K D2-l-2、 D4-l-l、 D4-1-2 的一次风 /淡煤粉喷嘴 7 相对应地设置在同一水平面上的同一层。 编号为 El-1-1、 El-l-2、 E3-l-l、 E3-l-2、 E2-l-l、 E2-l-2、 E4-l-l、 E4-1-2的一次风 /淡煤粉喷嘴 7相对应地设 置在同一水平面上的同一层。编号为 F1-1-K Fl-1-2. F3-1-K F3-1-2. F2-1-K F2-1-2, F4-1-K F4-1-2的一次风 /淡煤粉喷嘴 7相对应地设置在同一水平面 上的同一层。  Among them, the numbers are A1-2-K Al-2-2, A3-2-K A3-2-2, A2-2-K A2-2-2, A4-2-l, A4-2-2 The wind/pale pulverized coal nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane. Primary/fresh coals numbered Bl-1-1, Bl-l-2, B3-ll, B3-l-2, B2-1-K B2-l-2, B4-ll, B4-1-2 The powder nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane. Primary/pale pulverized coal with numbers Cl-1-1, Cl-l-2, C3-ll, C3-l-2, C2-ll, C2-l-2, C4-ll, C4-1-2 The nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane. Primary/fresh coals numbered Dl-1-1, D1-1-2, D3-ll, D3-l-2, D2-1-K D2-l-2, D4-ll, D4-1-2 The powder nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane. Primary/pale pulverized coal with numbers El-1-1, El-l-2, E3-ll, E3-l-2, E2-ll, E2-l-2, E4-ll, E4-1-2 The nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane. No. F1-1-K Fl-1-2. F3-1-K F3-1-2. F2-1-K F2-1-2, F4-1-K F4-1-2 The pulverized coal nozzles 7 are correspondingly disposed on the same layer on the same horizontal plane.
其中， 每个燃烧器组内， 设置在最上部的一次风 /淡煤粉喷嘴 7与设置在 最下部的一次风 /浓煤粉喷嘴 6之间的间距在 1米至 2米之间。在同样满足最 上的一次风煤粉喷嘴到炉膛出口屏底间距和无烟煤燃烧效率的前提下， 使得 锅炉的总高度减少， 大大降低了锅炉的制造成本， 同时降低了锅炉氮氧化物 的排放量。  Among them, in each burner group, the distance between the primary air/light coal powder nozzle 7 disposed at the uppermost portion and the primary air/rich coal powder nozzle 6 disposed at the lowermost portion is between 1 m and 2 m. Under the premise of satisfying the top air pulverized coal nozzle to the bottom of the furnace outlet and the burning efficiency of anthracite, the total height of the boiler is reduced, the manufacturing cost of the boiler is greatly reduced, and the nitrogen oxide emissions of the boiler are reduced.
每个锅炉还配置有六台磨煤机 3， 其分别为第一磨煤机 A、 第二磨煤机 B、 第三磨煤机 C、 第四磨煤机 D、 第五磨煤机 E及第六磨煤机 F。 Each boiler is also equipped with six coal mills 3, which are the first coal mill A and the second coal mill. B. Third coal mill C, fourth coal mill D, fifth coal mill E and sixth coal mill F.
每台磨煤机 3出口连接有四根煤粉管道 5， 每根煤粉管道 5上设有一个 煤粉的浓淡分离器 4， 浓淡分离器 4将每根煤粉管道 5分为一根浓煤粉管道 和一根淡煤粉管道。  There are four pulverized coal pipes 5 connected to the outlet of each coal mill 3, and each pulverized coal pipe 5 is provided with a pulverized coal separator 52, and the viscous separator 4 divides each pulverized coal pipe 5 into one thick Pulverized coal pipe and a light coal powder pipe.
每根浓煤粉管道上还设有一个煤粉分配器 12， 该煤粉分配器 12将浓煤 粉管道分为两根细的浓煤粉管道， 分别与同一面水冷壁 9上两个燃烧器组中 各自的一次风 /浓煤粉燃烧器的一次风 /浓煤粉喷嘴 6连接。  A pulverized coal distributor 12 is further disposed on each concentrated pulverized coal pipeline, and the pulverized coal distributor 12 divides the concentrated pulverized coal pipeline into two thin concentrated pulverized coal pipelines, respectively, and two burning on the same surface water wall 9 The primary/rich pulverized coal nozzles 6 of the respective primary/concentrated pulverized coal burners in the group are connected.
各个磨煤机 3与一次风 /浓煤粉喷嘴 6的连接关于如下：  The connection of each coal mill 3 to the primary/rich pulverized coal nozzle 6 is as follows:
第一磨煤机 A分别连接编号为 Al-1-1、 Al-l-2、 A2-1-K A2-1-2, A3-l-l、 A3-l-2、 A4-l-l、 A4-1-2的一次风 /浓煤粉喷嘴 6。  The first coal mill A is connected to the numbers Al-1-1, Al-1-2, A2-1-K A2-1-2, A3-ll, A3-l-2, A4-ll, A4-1. -2 primary air/concentrated pulverized coal nozzle 6.
第二磨煤机 B分别连接编号为 Bl-1-1、 Bl-1-2. B2-1-K B2-1-2. B3-1-K B3-1-2, B4-1-K B4-1-2的一次风 /浓煤粉喷嘴 6。  The second coal mill B is connected to the number B1-1-1, Bl-1-2. B2-1-K B2-1-2. B3-1-K B3-1-2, B4-1-K B4 -1-2 primary air/concentrated pulverized coal nozzle 6.
第三磨煤机 C分别连接编号为 C1-1-K Cl-1-2. C2-1-K C2-1-2. C3-1-K C3-1-2, C4-1-K C4-1-2的一次风 /浓煤粉喷嘴 6。  The third coal mill C is connected by the number C1-1-K Cl-1-2. C2-1-K C2-1-2. C3-1-K C3-1-2, C4-1-K C4- Primary air/concentrated pulverized coal nozzle 6 of 1-2.
第四磨煤机 D分别连接编号为 Dl-1-1、 Dl-l-2、 D2-l-l、 D2-l-2、 D3-l-l、 D3-l-2、 D4-l-l、 D4-1-2的一次风 /浓煤粉喷嘴 6。  The fourth coal mill D is respectively connected to the numbers Dl-1-1, Dl-1-2, D2-ll, D2-l-2, D3-ll, D3-l-2, D4-ll, D4-1- 2 primary air/concentrated pulverized coal nozzle 6.
第五磨煤机 E分别连接编号为 El-1-1、 El-1-2, E2-1-K E2-1-2, E3-l-l、 E3-l-2、 E4-l-l、 E4-1-2的一次风 /浓煤粉喷嘴 6。  The fifth coal mill E is connected to the numbers El-1-1, El-1-2, E2-1-K E2-1-2, E3-ll, E3-l-2, E4-ll, E4-1 -2 primary air/concentrated pulverized coal nozzle 6.
第六磨煤机 F分别连接编号为 Fl-1-1、 Fl-1-2. F2-1-K F2-1-2. F3-l-l、 F3-l-2、 F4-l-l、 F4-1-2的一次风 /浓煤粉喷嘴 6。  The sixth coal mill F is connected to the number Fl-1-1, Fl-1-2. F2-1-K F2-1-2. F3-ll, F3-l-2, F4-ll, F4-1 -2 primary air/concentrated pulverized coal nozzle 6.
每根淡煤粉管道上设有一个煤粉分配器 12， 该煤粉分配器 12将淡煤粉 管道分为两根细的淡煤粉管道， 分别与同一面水冷壁 9上两个燃烧器组中各 自的一次风 /淡煤粉燃烧器的一次风 /淡煤粉喷嘴 7连接。  A pulverized coal distributor 12 is disposed on each of the pulverized coal powder pipes, and the pulverized coal distributor 12 divides the pulverized coal pulverized coal pipe into two fine pulverized coal pulverized pipes, respectively, and two burners on the same surface water wall 9 The primary/light pulverized coal nozzles 7 of the respective primary/light pulverized coal burners in the group are connected.
各个磨煤机 3与一次风 /淡煤粉喷嘴 7的连接关于如下：  The connection of each coal mill 3 to the primary/light coal powder nozzle 7 is as follows:
第一磨煤机 A分别连接编号为 Al-2-l、 Al-2-2、 A2-2-K A2-2-2, A3-2-K A3-2-2、 A4-2-l、 A4-2-2的一次风 /淡煤粉喷嘴 7。  The first coal mill A is connected to the numbers Al-2-l, Al-2-2, A2-2-K A2-2-2, A3-2-K A3-2-2, A4-2-l, Primary air/light coal powder nozzle 7 of A4-2-2.
第二磨煤机 B分别连接编号为 Bl-2-l、 Bl-2-2. B2-2-K B2-2-2. B3-2-K B3-2-2, B4-2-K B4-2-2的一次风 /淡煤粉喷嘴 7。  The second coal mill B is connected by the number B1-2-1, Bl-2-2. B2-2-K B2-2-2. B3-2-K B3-2-2, B4-2-K B4 Primary air/light coal powder nozzle -2-2.
第三磨煤机 C分别连接编号为 Cl-2-l、 Cl-2-2. C2-2-K C2-2-2. C3-2-K C3-2-2, C4-2-K C4-2-2的一次风 /淡煤粉喷嘴 7。 第四磨煤机 D分别连接编号为 Dl-2-l、 Dl-2-2、 D2-2-K D2-2-2, D3-2-l、 D3-2-2、 D4-2-l、 D4-2-2的一次风 /淡煤粉喷嘴 7。 The third coal mill C is connected by the number Cl-2-l, Cl-2-2. C2-2-K C2-2-2. C3-2-K C3-2-2, C4-2-K C4 Primary air/light coal powder nozzle -2-2. The fourth coal mill D is connected to the numbers Dl-2-l, Dl-2-2, D2-2-K D2-2-2, D3-2-l, D3-2-2, D4-2-l , D4-2-2 primary air / light coal powder nozzle 7.
第五磨煤机 E分别连接编号为 El-2-l、 El-2-2, E2-2-K E2-2-2, E3-2-K E3-2-2, E4-2-K E4-2-2的一次风 /淡煤粉喷嘴 7。  The fifth coal mill E is connected to the numbers El-2-l, El-2-2, E2-2-K E2-2-2, E3-2-K E3-2-2, E4-2-K E4 Primary air/light coal powder nozzle -2-2.
第六磨煤机 F分别连接编号为 Fl-2-l、 Fl-2-2. F2-2-K F2-2-2. F3-2-K F3-2-2, F4-2-K F4-2-2的一次风 /淡煤粉喷嘴 7。  The sixth coal mill F connection number is Fl-2-l, Fl-2-2. F2-2-K F2-2-2. F3-2-K F3-2-2, F4-2-K F4 Primary air/light coal powder nozzle -2-2.
如图 3并结合图 5所示， 本发明用无烟煤的单火球八角直流燃烧器煤粉 浓淡分离布置结构采用 "带煤粉浓淡分离装置的中速磨或双进双出直吹式制 粉***"，其主要原理是在磨煤机 3出口连接的每根煤粉管道 5上，增加一个 煤粉的浓淡分离器 4， 将一次风 /煤粉进行浓淡分离， 分成一路 80%的煤粉和 50%的一次风 /浓煤粉气流， 和一路剩余的 20%的煤粉和 50%的一次风 /淡煤 粉气流，分别通过燃烧器组中的一次风 /浓煤粉喷嘴 6和一次风 /淡煤粉喷嘴 7， 送入炉膛 2内部燃烧。一次风 /浓煤粉喷嘴 6所对应的炉膛 2内部的区域为浓 煤粉燃烧区，一次风 /淡煤粉喷嘴 7所对应的炉膛 2内部的区域为淡煤粉燃烧 区， 该淡煤粉燃烧区位于浓煤粉燃烧区的上方。  As shown in FIG. 3 and in combination with FIG. 5, the single fireball octagonal direct current burner pulverized coal separation and arrangement structure of the anthracite coal adopts the "medium speed grinding or double inlet and double outlet direct blowing type pulverizing system with pulverized coal concentration and separation device". "The main principle is to add a pulverized coal separator concentrator 4 to each pulverized coal pipe 5 connected to the outlet of the coal mill 3, and separate the primary air/pulverized coal into a light and dark separation, and divide it into 80% pulverized coal and 50% of the primary/concentrated pulverized coal flow, and the remaining 20% of the pulverized coal and 50% of the primary/light pulverized coal flow, respectively, through the primary/rich pulverized coal nozzle 6 and the primary air in the burner group /Pale pulverized coal nozzle 7, sent to the inside of the furnace 2 for combustion. The area inside the furnace 2 corresponding to the primary/concentrated pulverized coal nozzle 6 is a concentrated pulverized coal combustion zone, and the area inside the furnace 2 corresponding to the primary/light pulverized coal nozzle 7 is a light pulverized coal combustion zone, the pulverized coal powder The combustion zone is located above the concentrated pulverized coal combustion zone.
通过采用 "带煤粉浓淡分离装置的中速磨或双进双出直吹式制粉***"， 使得浓一次风 /煤粉的风粉比和一次风比率，均要优于中间仓储制热风送粉系 统的相应参数， 同时将含有一半水份的 50%—次风分离出来， 从燃烧器组中 位于上部的一次风 /淡煤粉喷嘴 7送入炉膛 2， 虽然一次风粉的混合温度， 要 比采用中间仓储制热风送粉***的一次风粉的混合温度低，但是这样的设计， 通过理论计算可知， 与采用中间仓储制热风送粉***相比， 浓煤粉气流的着 火热是基本一样的， 从而保证了浓煤粉气流的稳定着火。  By adopting the "medium speed grinding or double-inlet and double-out direct-blowing pulverizing system with pulverized coal concentration and separation device", the ratio of the air-to-powder ratio and the primary air ratio of the concentrated primary air/pulverized coal is better than that of the intermediate storage and heating air. The corresponding parameters of the powder feeding system, at the same time, 50%-secondary wind containing half of the water is separated, and sent to the furnace 2 from the primary air/light coal powder nozzle 7 located in the upper part of the burner group, although the mixing temperature of the primary air powder The mixing temperature of the primary air powder is lower than that of the intermediate storage hot air feeding system. However, the design shows that the heat of the concentrated coal powder is higher than that of the intermediate storage hot air feeding system. Basically the same, thus ensuring a stable ignition of the concentrated pulverized coal gas stream.
尽管本发明的内容已经通过上述优选实施例作了详细介绍， 但应当认识 到上述的描述不应被认为是对本发明的限制。 在本领域技术人员阅读了上述 内容后， 对于本发明的多种修改和替代都将是显而易见的。 因此， 本发明的 保护范围应由所附的权利要求来限定。  Although the present invention has been described in detail by the preferred embodiments thereof, it should be understood that the foregoing description should not be construed as limiting. Various modifications and alterations of the present invention will be apparent to those skilled in the art. Therefore, the scope of the invention should be limited by the appended claims.

Claims

权利要求： Rights request:
1. 一种单火球八角直流燃烧器煤粉浓淡分离布置结构， 该结构包含：  1. A single fireball octagonal direct current burner pulverized coal separation structure, the structure comprises:
锅炉本体（1 )， 其由四面水冷壁（9) 围绕组成， 四面水冷壁（9) 围 绕设置所形成的内部空间为锅炉本体 （1 ) 的炉膛 （2);  a boiler body (1), which is composed of a four-sided water-cooling wall (9), and an inner space formed by the four-sided water-cooling wall (9) is a furnace body (2) of the boiler body (1);
若干个燃烧器（10)，其分别设置在水冷壁（9)上，并穿过水冷壁（9) 与炉膛 （2) 连通； 燃烧器 （10) 上设有朝向炉膛 （2) 内设置的喷嘴； 煤粉管道 （5);  a plurality of burners (10) respectively disposed on the water wall (9) and communicating with the furnace (2) through the water wall (9); the burner (10) is provided facing the furnace (2) Nozzle; pulverized coal pipe (5);
浓淡分离器 （4)， 其通过煤粉管道 （5) 分别与若干个燃烧器 （10) 连接； 以及，  a concentration separator (4) connected to a plurality of burners (10) through a pulverized coal pipe (5);
若干磨煤机 （3 )， 其通过煤粉管道 （5) 与浓淡分离器 （4) 连接； 每台所述的锅炉本体 （1 ) 至少设有一台所述的磨煤机 （3); 其特征在于， 所述的锅炉本体 （1 ) 上设有八个燃烧器组， 每个所述 的水冷壁 （9) 上各设有两个燃烧器组， 每个燃烧器组中包含有若干个喷 嘴朝向相同的燃烧器 （10)， 八个燃烧器组上各喷嘴的中心线在炉膛 （2) 内形成一个假想切圆 （11 )。  a plurality of coal mills (3) connected to the concentration separator (4) through a pulverized coal pipe (5); each of the boiler bodies (1) having at least one of the coal mills (3); The utility model is characterized in that: the boiler body (1) is provided with eight burner groups, each of the water-cooling walls (9) is provided with two burner groups, and each burner group comprises several The nozzles are oriented towards the same burner (10), and the centerline of each nozzle on the eight burner groups forms an imaginary tangent (11) in the furnace (2).
2. 如权利要求 1所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 所述的锅炉本体 （1 ) 四面水冷壁 （9) 分别设为锅炉本体 （1 ) 的前墙、 后墙、 左恻墙和右恻墙， 前墙与后墙相对设置， 左恻墙与右恻墙 相对设置； 设置在前墙或后墙上燃烧器（10)喷嘴的中心线与其所设处的 水冷壁（9)相交于一交点， 该交点距离最近的相邻水冷壁（9)连接处的 距离为 Ll， l/10Lw^L1^4/10Lw, Lw为锅炉本体（1 )前墙与后墙之间 的距离。  2. The single fireball octagonal direct current burner pulverized coal dust separation arrangement structure according to claim 1, wherein the boiler body (1) four-sided water wall (9) is respectively set as the front of the boiler body (1) The wall, the rear wall, the left wall and the right wall, the front wall and the rear wall are opposite each other, and the left wall and the right wall are opposite each other; the center line of the burner of the front wall or the rear wall burner (10) is located The water wall (9) of the location intersects at an intersection, the distance from the junction of the nearest adjacent water wall (9) is Ll, l/10Lw^L1^4/10Lw, Lw is before the boiler body (1) The distance between the wall and the back wall.
3. 如权利要求 2所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 设置在左恻墙或右恻墙上燃烧器（10)喷嘴的中心线与其所设处 的水冷壁（9)相交于一交点， 该交点距离最近的相邻水冷壁（9)连接处 的距离为 L2， l/10Ld^L2^4/10Ld, Ld为锅炉本体 （1 ) 左恻墙和右恻 墙之间的距离。  3. The single fireball octagonal direct current burner pulverized coal dust separation arrangement according to claim 2, wherein the center line of the nozzle of the burner (10) disposed on the left or right wall is arranged The water wall (9) intersects at an intersection, the distance from the junction of the nearest adjacent water wall (9) is L2, l/10Ld^L2^4/10Ld, Ld is the boiler body (1) left wall and The distance between the right wall and the wall.
4. 如权利要求 1所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 燃烧器 （10) 喷嘴的中心线与其所设处的水冷壁 （9) 相交于一 交点， 以该交点与假想切圆（11 ) 的圆心连成一直线， 该直线与该燃烧器 ( 10) 喷嘴的中心线之间设有夹角 a, 0° a 30° 。 4. The single fireball octagonal direct current burner pulverized coal dust separation arrangement according to claim 1, wherein the center line of the burner (10) nozzle intersects with the water wall (9) where the nozzle is located at an intersection. The intersection is aligned with the center of the imaginary tangent circle (11), the line and the burner (10) An angle a, 0° a 30° between the centerlines of the nozzles.
5. 如权利要求 1所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于，每个所述的燃烧器组沿垂直方向分为两个小组，该两小组分别为 第一燃烧器小组和第二燃烧器小组， 第一燃烧器小组设置在水冷壁 （9) 的下部， 第二燃烧器小组设置在水冷壁 （9) 的上部。  5. The single fireball octagonal direct current burner pulverized coal dust separation arrangement according to claim 1, wherein each of said burner groups is divided into two groups in a vertical direction, and the two groups are respectively first. The burner group and the second burner group, the first burner group is disposed at a lower portion of the water wall (9), and the second burner group is disposed at an upper portion of the water wall (9).
6. 如权利要求 5所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 所述的第一燃烧器小组包含一次风 /浓煤粉燃烧器， 该一次风 /浓 煤粉燃烧器上沿垂直方向至少设置有一个一次风 /浓煤粉喷嘴（6)和两个 二次风喷嘴 （8)， 该一次风 /浓煤粉喷嘴 （6) 与二次风喷嘴 （8 ) —一间 隔设置。  6. The single fireball octagonal direct current burner pulverized coal dust separation arrangement structure according to claim 5, wherein the first burner group comprises a primary air/concentrated pulverized coal burner, the primary air/rich coal At least one primary air/concentrated coal powder nozzle (6) and two secondary air nozzles (8) are arranged on the powder burner in the vertical direction, and the primary air/concentrated coal powder nozzle (6) and the secondary air nozzle (8) ) — an interval setting.
7. 如权利要求 6所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 所述的第二燃烧器小组包含一次风 /淡煤粉燃烧器， 该一次风 /淡 煤粉燃烧器上沿垂直方向至少设置有一个一次风 /淡煤粉喷嘴（7)和两个 二次风喷嘴 （8)， 该一次风 /淡煤粉喷嘴 （7 ) 与二次风喷嘴 （8 ) —一间 隔设置。  7. The single fireball octagonal direct current burner pulverized coal dust separation arrangement according to claim 6, wherein the second burner group comprises a primary air/pale pulverized coal burner, the primary air/light coal At least one primary air/light coal powder nozzle (7) and two secondary air nozzles (8) are disposed on the powder burner in the vertical direction, and the primary air/light coal powder nozzle (7) and the secondary air nozzle (8) ) — an interval setting.
8. 如权利要求 7所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 每台所述的磨煤机 （3 ) 的出口连接有若干根煤粉管道 （5)， 每 根煤粉管道（5 )通过所述的浓淡分离器（4)分为浓煤粉管道和淡煤粉管 道。  8. The single fireball octagonal direct current burner pulverized coal dust separation arrangement structure according to claim 7, wherein each of the coal mills (3) is connected with a plurality of pulverized coal pipes (5) at an outlet thereof. Each pulverized coal pipe (5) is divided into a concentrated pulverized coal pipe and a light pulverized coal pipe by the concentration separator (4).
9. 如权利要求 8所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 所述的浓煤粉管道上设有煤粉分配器 （12)， 并通过煤粉分配器 9. The single fireball octagonal direct current burner pulverized coal dust separation arrangement structure according to claim 8, wherein the concentrated coal powder pipeline is provided with a coal powder distributor (12) and passed through the coal powder distributor.
( 12) 分为若干根细的浓煤粉管道， 分别与若干个所述的一次风 /浓煤粉 喷嘴 （6) 连接； (12) Divided into a number of thin concentrated pulverized coal pipes, which are respectively connected to a plurality of said primary/rich pulverized coal nozzles (6);
所述的淡煤粉管道上设有煤粉分配器（12)， 并通过煤粉分配器（12) 分为若干根细的淡煤粉管道，分别与若干个所述的一次风 /淡煤粉喷嘴（7 ) 连接。  The pulverized coal powder pipeline is provided with a pulverized coal distributor (12), and is divided into a plurality of fine pulverized coal pulverized coal pipelines through the pulverized coal distributor (12), respectively, and a plurality of said primary/fresh coals The powder nozzle (7) is connected.
10.如权利要求 7所述的单火球八角直流燃烧器煤粉浓淡分离布置结构，其特 征在于， 设置在最上部的所述一次风 /淡煤粉喷嘴（7 )与设置在最下部的 所述一次风 /浓煤粉喷嘴 （6) 之间的间距在 1米至 2米之间。  10. The single fireball octagonal direct current burner pulverized coal dust separation arrangement according to claim 7, wherein the primary air/light coal powder nozzle (7) disposed at the uppermost portion and the lowermost portion are disposed. The distance between the primary/rich pulverized coal nozzles (6) is between 1 and 2 meters.
PCT/CN2012/071222 2011-11-14 2012-02-16 Thick-thin coal dust separation and arrangement structure for single-fireball eight-corner straight-flow burner WO2013071713A1 (en)

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US13/808,121 US20140038115A1 (en) 2011-11-14 2012-02-16 Dense/Dilute Pulverized Coal Separator Structure of Single-fireball Octagonal Direct-flow Burner
EP12824757.4A EP2781833A4 (en) 2011-11-14 2012-02-16 Thick-thin coal dust separation and arrangement structure for single-fireball eight-corner straight-flow burner
ZA2013/01308A ZA201301308B (en) 2011-11-14 2013-02-20 Dense/dilute pulverized coal separator structure of single-fireball octagonal direct-flow burner

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