CN201787567U

CN201787567U - Direct-flow pulverized coal burner

Info

Publication number: CN201787567U
Application number: CN2010202856358U
Authority: CN
Inventors: 郑平安
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-09
Filing date: 2010-08-09
Publication date: 2011-04-06
Anticipated expiration: 2020-08-09

Abstract

The utility model relates to a direct-flow pulverized coal burner, which is stable in burning and excellent in oil-saving performance, and comprises a burner body outer casing consisting of an inlet pipeline, a Venturi concentrator and jet pipe in sequential connection. An oil-burning air pipe and an oil burning device positioned at the center of the oil-burning air pipe are further arranged in the burner. The direct-flow pulverized coal burner is characterized in that a rectifying concentration separating device is arranged in the inlet pipeline, an upper concentration separating partition plate and a lower concentration separating partition plate are symmetrically arranged in the jet pipe according to the central line of the burner body outer casing, a flow expansion cone is arranged between each concentration separating partition plate and an outlet expansion section of the Venturi concentrator, the top of the flow expansion cone points at the necking position of the Venturi concentrator; the oil-burning air pipe penetrates through the flow expansion cone; and a burning supporting air passage is communicated with the inside of a jet of the jet pipe.

Description

Straight-through pulverized coal burner

Technical field

The utility model relates to a kind of burner, particularly a kind of straight-through pulverized coal burner.

Background technology

Coal is the main energy sources of China, though coal resources in China is abundant, coal is changeable, ature of coal is relatively poor.In recent years, domestic coal state of supply continues to worsen, the coal price continuous rise, increase win for making up deficits, domestic each big genco generally carries out mixed coal and burns strategy disastrously, to reduce cost of electricity-generating, uses ash content height, colm that calorific value is low in a large number, cause the phenomenon that unit operation stability reduces, high load capacity is put out a fire to happen occasionally, and the number of starts frequently make the startup oil consumption increase; In addition, the combustion stability reduction also can make combustion-supporting oil consumption increase.At this situation, exploitation burning environment of inferior quality coal technology just seems necessary and in good time.

Supply with present situation according to the coal that China is present, the pulverized coal combustion that market demand combination property is higher, present fuel-saving technique effect aspect the startup fuel-economizing is remarkable, but normally in service at unit, reduce the combustibility of catching fire, make that to use effect on meager coal and the poorer coal unit not good using; Surely fire peak modulation capacity though present stable combustion technology can significantly strengthen unit, do not possess the startup energy-saving function substantially.

Summary of the invention

Problem to be solved in the utility model is improved existing coal burner, and a kind of flameholding, all good straight-through pulverized coal burners of fuel-economizing performance are provided.

The technical scheme that addresses the above problem is: the straight-through pulverized coal burner that is provided comprises by inlet duct, the burner body shell that venturi inspissator and jet pipe are connected to form in turn, also be provided with oil firing airduct and the oil combustion device that is positioned at oil firing airduct center in the burner, improvements of the present utility model are: the rectification light-dark separation device is set in the inlet duct, center line by the burner body shell in jet pipe is symmetrical arranged deep or light separation dividing plate up and down, between the outlet expanding section of deep or light separation dividing plate and venturi inspissator, be provided with and expand the flow cone body, this expands the bottleneck that the flow cone body vertex of a cone points to the venturi inspissator, the oil firing airduct runs through expansion flow cone body, and combustion-supporting air channel is led in the spout of jet pipe.

The effect in combustion-supporting air channel is the spout and the aftercombustion air of cooled nozzle pipe, and the chamber that deep or light up and down separation dividing plate is 8 is coal dust one-level combustion chamber, and the chamber at jet pipe spout place is a coal dust secondary combustion chamber.Breeze airflow enters inlet duct, rectification light-dark separation device in inlet duct is implemented optimizing and revising of distribution of particles to breeze airflow, enter the venturi inspissator then, carry out the deep or light separation of secondary, the deep or light separation fluidised form of the divisible maintenance breeze airflow of deep or light separation dividing plate.Most of thin powdered coal air-flow enters the passage between lower wall surface on deep or light separation dividing plate and the spout; Fraction thick coal culm air-flow enter expand the flow cone body with deep or light separate the passage between the dividing plate and expand flow cone body and jet pipe madial wall and venturi inspissator export passage between the expanding section two side; Separate with deep or light that passage enters between the dividing plate the one-level coal dust firing of thick coal culm air-flow after being subjected to cone is indoor to be subjected to the retardance of recirculating zone and to realize efficiently concentrating once more from expanding the flow cone body, air-flow is after this mode is handled, its steady combustion ability greatly strengthens, and combustion-supporting oil consumption is also reduced greatly.

Above-mentioned oil firing airduct runs through expansion flow cone body two kinds of selection modes: flow cone body center line runs through expansion flow cone body to the oil firing airduct or oblique running through of oil firing airduct expanded the flow cone body along expanding.

Above-mentioned combustion-supporting air channel also can constitute like this: at the outer setting air film bellows of burner body shell, form combustion-supporting air channel between air film bellows and the burner body shell.

The utility model has the advantages that: because breeze airflow is by repeatedly deep or light separation, formation is very suitable for the ablaze deep or light separation fluidised form of breeze airflow, must form classification tonifying Qi effect, make the carbon residue burning can access the oxygen amount supply of timely abundance, efficiency of combustion improves, unburned carbon in flue dust reduces, and reaches the purpose that improves boiler efficiency, reduces coal-fired consumption.Because take multiple deep or light separating measure, measures such as entering concentrated phase air-flow multiply passage gradually is set, under the situation that steady combustion ability further strengthens, rate of economizing gasoline increases substantially.

Description of drawings

Fig. 1 is the structure diagram of the utility model first embodiment.

Fig. 2 is the vertical view of Fig. 1.

Fig. 3 is the structure diagram of the utility model second embodiment.

Fig. 4 is the vertical view of Fig. 3.

The specific embodiment

Below in conjunction with accompanying drawing content of the present utility model is described in detail.

First embodiment of the present utility model as shown in Figure 1 and Figure 2.Inlet duct 1, venturi inspissator 5, jet pipe 9 connect successively, constitute the burner body shell, and oil combustion device 4 is positioned at oil firing airduct 3 centers.Rectification light-dark separation device 2 is set in the inlet duct 1, in jet pipe 9, be symmetrical arranged deep or light separation dividing plate 8 up and down, between the outlet expanding section of dividing plate 8 and venturi inspissator 5, be provided with and expand flow cone body 7, oil firing airduct 3 runs through expansion flow cone body 7 along expansion flow cone body 7 center lines, and (oil firing airduct 3 also can obliquely run through expansion flow cone body 7, the center line that is the oil firing airduct intersects the certain angle angle with the center line that expands the flow cone body), the spout interior (referring to Fig. 2) of jet pipe 9 is led in combustion-supporting air channel 61.The outlet of oil firing airduct 3 connects oil firing chamber 12, and the chamber between the deep or light up and down separation dividing plate 8 is first pulverized coal combustor 13, and the chamber at jet pipe spout place is a coal dust secondary combustion chamber 14.

The jet pipe 9 of this example and the cross section of venturi inspissator 5 are all rectangular, lower wall and concordant joining of venturi inspissator 5 ports of export on the jet pipe 9; Inwall up and down in jet pipe 9 exits is contraction inclined-plane 91, forms laterally zygomorphic contraction taper; Jet pipe 9 two sides are double-decker, form combustion-supporting air channel 61, jet pipe

madial wall

92 and 5 concordant joining of venturi inspissator, and jet pipe madial wall 92 exits are triangular shape projection 93.

The expansion flow cone body 7 of this example is the triangle cone, form passage aisle 71 between the two side of the sidewall of expansion flow cone body 7 and jet pipe madial wall 92 and venturi inspissator 5 outlet expanding sections, expand the bottom end face of flow cone body 7 and arrange a plurality of rectangular column pieces 72 up and down, from A to, a plurality of rectangular column pieces 72 are a Great Wall shape.

Fig. 3, Fig. 4 have provided second embodiment of the present utility model.Air film bellows 6 are set outside the burner body shell, at this moment, form combustion-supporting air channel 61 between air film bellows 6 and the burner body shell.The inlet of air film bellows 6 is provided with damper 10, is used to regulate the air quantity of combustion air W3.At the wall of oil firing chamber 12, one-level pulverized coal combustor 13, secondary pulverized coal combustor 14 wall temperature measurement thermocouple 11 thermocouple of secondary pulverized coal combustor 14 walls (Bel guest's example only drawn) is set respectively.Other structure of this example is identical with first embodiment.

The operation principle of this burner is described below in conjunction with second embodiment.

The wind W2 that is used for fuel oil enters fuel oil airduct 3, breeze airflow W1 inlet port pipeline 1, through rectification light-dark separation device 2, the separation of breeze airflow realization distribution of particles is optimized and revised, enter venturi inspissator 5 backs and realize the deep or light separation of secondary wind, major part is thin powdered coal air-flow w1d, enters the passage between lower wall surface on dividing plate 8 and the jet pipe 9; Fraction is thick coal culm air-flow w1n, and the major part of this thick coal culm air-flow enters the last lower channel that expands between flow cone body 7 and the last lower clapboard 8, and fraction enters and jet pipe madial wall, venturi inspissator export the passage aisle 71 between the expanding section two side.Enter that most of thin powdered coal air-flow of passage is subjected to the deflection effect of inertia between dividing plate 8 and last lower wall surface, be close to lower wall surface, spurt into burner hearth with adherent jet-like, the contraction cone structure in exit, pulverized coal particle in this part air-flow is folded to the center to be moved, gas inertia is little, air-flow streams the extended corner increasing near nearly wall, and power stream still sprays with adherent jet, and a large amount of furnace high-temperature flue gases that entrainment enter in coal dust I and II

combustion chamber

13 and 14.

After the thick coal culm air-flow of lower channel is walked around and is expanded the flow cone body on entering between expansion flow cone body 7 and the last lower clapboard 8, under comprehensive functions such as 72 effects of being folded to of end face rectangular column piece, recirculating zone malleation low regime retardance deceleration enrichment, dividing plate 8 outlet section triangle inclined-planes are folded to, make this part air-flow realize efficient concentrating, the pulverized coal particle classification is moved to the center; Fraction enters the thick coal culm air-flow of both sides passage aisle 71, is subjected to triangular shape inclined-plane guide functions after expanding the flow cone body, flows to zone line rapidly.

High-temperature flue gas and classification that backflow enters one-level pulverized coal combustor 13 are folded to the strong blending of high concentration pulverized coal air-flow of moving to the center, finish the exchange of high caloic and by Fast Heating, volatile matter separate out fast in a large number and fire burns, form stable fire area, spread the main breeze airflow that constantly ignites with air-flow, breeze airflow is stablized burning in advance like this, steady combustion ability greatly strengthens, under normal peak regulation load, save whole combustion-supporting oil consumption, reach the purpose that strengthens peak modulation capacity, reduces combustion-supporting oil consumption.

In cold conditions ignition trigger process, temperature levels is low in the stove, torch oil gun only need satisfy in oil combustion chamber 12 burning release heat and enters the one-level pulverized coal combustor 13 core thick coal culm air-flows needs that catch fire, thereby institute's calorific requirement is few, make this part coal powder ignition burning, feed back by the recirculating zone again and the air-flow diffusion, main breeze airflow one by one ignites, enabled stage is constantly amplified, with few fuel consume, finish cold conditions ignition trigger process, significantly reduce ignition trigger process fuel consume, reach startup oil consumption purpose.

The timely reaction wall surface temperature of the temperature-measuring heat couple situation of change that is provided with at the wall of oil combustion chamber 12, one-level pulverized coal combustor 13, secondary pulverized coal combustor 14, measure each combustion chamber internal combustion situation of temperature indirect reaction, if temperature is higher than wall temperature limit allowed to bear, can open air film air cooling spout, perhaps reduce Oil Gun, make burner be in the following work of safe temperature limit all the time.

From the above-mentioned course of work as can be seen: no matter cold conditions ignition trigger, still normal course of operation, center, coal dust one-level combustion chamber high concentration pulverized coal all be in by Fast Heating, volatile matter separate out fast in a large number, the fired state that under the oxygen deprivation environment, catches fire, greatly suppress the generation of nitrogen oxide; At the secondary pulverized coal combustor; sneaking into of light phase air-flow; timely aftercombustion air; overheavy firing; because of the unmixed benefit of secondary prevailing custom is gone into, so formation still is high temperature reduction flame, the nitrogen oxide that center thick coal culm burning is produced is reduced; can reduce discharged nitrous oxides concentration significantly, reach protection environment purpose.

Claims

1. straight-through pulverized coal burner, comprise by inlet duct (1), the burner body shell that venturi inspissator (5) and jet pipe (9) are connected to form in turn, also be provided with oil firing airduct (3) in the burner and be positioned at the oil combustion device (4) at oil firing airduct center, it is characterized in that: rectification light-dark separation device (2) is set in the inlet duct (1), center line by the burner body shell in jet pipe is symmetrical arranged deep or light separation dividing plate (8) up and down, between the outlet expanding section of deep or light separation dividing plate (8) and venturi inspissator (5), be provided with and expand flow cone body (7), this expands the bottleneck that flow cone body (7) vertex of a cone points to venturi inspissator (5), oil firing airduct (3) runs through expansion flow cone body (7), and combustion-supporting air channel (61) are led in the spout of jet pipe (9).

2. coal burner according to claim 1 is characterized in that oil firing airduct (3) runs through expansion flow cone body 7 two kinds of selection modes are arranged: flow cone body (7) center line runs through expansion flow cone body to oil firing airduct (3) or oblique running through of oil firing airduct (3) expanded flow cone body (7) along expanding.

3. coal burner according to claim 1 is characterized in that the outer setting air film bellows (6) at the burner body shell, forms combustion-supporting air channel (61) between air film bellows (6) and the burner body shell.

4. coal burner according to claim 3 is characterized in that the inlet of air film bellows (6) is provided with damper (10).

5. according to each described coal burner of claim 1 to 4, it is characterized in that the cross section of jet pipe (9) and venturi inspissator (5) is all rectangular, jet pipe (9) is gone up lower wall and venturi inspissator (5) concordant joining of the port of export; Inwall up and down in jet pipe (9) exit is contraction inclined-plane (91), forms laterally zygomorphic contraction taper; Jet pipe (9) two side is a double-decker, forms combustion-supporting air channel (61), jet pipe madial wall (92) and concordant joining of venturi inspissator (5), and jet pipe madial wall (92) exit is triangular shape projection (93).

6. coal burner according to claim 5, it is characterized in that expanding flow cone body (7) and be the triangle cone, form passage aisle (71) between the two side of the sidewall of expansion flow cone body (7) and jet pipe madial wall (92) and venturi inspissator (5) outlet expanding section, expand the bottom end face of flow cone body (7) and arrange a plurality of rectangular column pieces (72) up and down, from A to, a plurality of rectangular column pieces (72) are a Great Wall shape.