CN102062396B - Composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner - Google Patents

Composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner Download PDF

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CN102062396B
CN102062396B CN2010105064266A CN201010506426A CN102062396B CN 102062396 B CN102062396 B CN 102062396B CN 2010105064266 A CN2010105064266 A CN 2010105064266A CN 201010506426 A CN201010506426 A CN 201010506426A CN 102062396 B CN102062396 B CN 102062396B
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China
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wind
coal
wind passage
burner
pulverized coal
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CN2010105064266A
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Chinese (zh)
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CN102062396A (en
Inventor
赵钦新
王云刚
吉用锋
苟远波
鲍颖群
成丁南
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西安交通大学
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    • Y02E20/344

Abstract

The invention relates to a composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner which comprises a central wind passage, wherein a primary wind passage, an internal direct-flow secondary wind passage, an internal rotational-flow secondary wind passage and an external rotational-flow secondary wind passage are sequentially and concentrically arranged at the outer side of the central wind passage from inside to outside, a conical pulverized-coal concentrating device and a star-shaped pulverized-coal concentrating device are arranged in the primary wind passage, and a reversed V-shaped expanded opening and a zigzag axial and radial double concave-convex structured burning-stabilizing device are arranged at the outlet of the primary wind passage; and after primary wind passes through the pulverized-coal concentrating device, an intense standing-vortex burning-stabilizing firing area with obvious circumferential and radial pulverized-coal concentration distribution is formed at the outlet of the burner, and the burning conditions of high-temperature reflow smoke gas and oxygen-deficient rich fuel are generated. The burner has extremely strong firing-stabilizing performance and good coal adaptability and effectively reduces the concentration of nitrogen oxides.

Description

A kind of compound deep or light three transfer the low NO of wind xVortex burner

Technical field

The invention belongs to a kind of coal burner, particularly coal powder density edge, a kind of burner outlet place three accent wind circumferential and the deep or light distribution of radial compound hang down NO XVortex burner.

Background technology

After the advanced combustion technology such as coal powder light-dark technology, grading combustion technology occurs, turbulent burner not only can highly organized Furnace Aerodynamic Field, produce rational ignition zone breeze airflow CONCENTRATION DISTRIBUTION, the pulverized coal particle time of staying and ignition distance, guarantee smooth combustion, and can reduce in a large number NO XDischarging.The advantages such as simultaneously, the turbulent burner burning has relative independence, and layout is all relative flexible with adjustment, and the deviation of flue gas temperature of hearth outlet and vapor (steam) temperature is less.Therefore, turbulent burner is widely used at the large-scale power station coal-burning boiler.

Although turbulent burner has plurality of advantages, and operation conditions is good both at home and abroad, but turbulent burner is unsatisfactory in China's operating position, and many power plant catch fire postponement, colm of boiler occur and catch fire that difficulty, combustion instability, low-load combustion-stabilizing ability, slagging scorification are serious, NO in actual motion XThe problem such as discharge capacity exceeds standard and reheater water injection desuperheat amount is excessive.Tracing it to its cause, mainly is because China's steam coal presents the characteristics that coal is changeable, ature of coal is relatively poor.Simultaneously, for the variation that adapts to network load and increasingly serious environmental requirement, the low-load combustion-stabilizing ability of boiler and low NO XEmission request improves constantly.

For this reason, novel turbulent burner generally adopts the swirl strength of strengthening primary and secondary air, or steady combustion tooth (ring) is installed in a wind outlet additional, or change the technology such as burner outlet shape and improve combustion position, install interior external tooth form ring, Chinese invention patent 200410041107 " petal-shaped combustion stabilizer of turbulent burner " additional with a wind snout petalody shape etc. such as: Chinese invention patent 03134317.1. " a kind of radially gradation double is transferred the wind vortex burner " at burner nozzle.However, existing turbulent burner is for adaptability, low-load combustion-stabilizing ability, the low NO of coal XThe aspects such as discharging still do not obtain fine solution.

Summary of the invention

In order further to improve combustion position, overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of coal powder density along circumferential and the deep or light distribution of radial compound, combustion stability is good, the low NO of compound deep or light three accent wind that coal adaptability is wide XVortex burner.

For achieving the above object, the technical solution used in the present invention is: a kind of compound deep or light three transfer the low NO of wind XVortex burner, comprise oil gun 1, in oil gun 1 outside from inside to outside successively arranged concentric center wind duct 2 is arranged, a wind path 10, interior direct-current secondary wind passage 11, inward eddy secondary air channel 12, outer eddy flow secondary air channel 13, in wind path 10, along general mood flow path direction successively arranged concentric wear ring 3 is arranged, taper Pulverized Coal Concentration device 5 and star Pulverized Coal Concentration device 7, inward eddy secondary air channel 12 import departments are provided with interior direct-current secondary wind and transfer windshield plate 4, be provided with inward eddy Secondary Air swirl-flow devices 6 in the inward eddy secondary air channel 12, outer eddy flow secondary air channel 13 porch ecto-entads are disposed with outer second air and transfer windshield plate 15 and outer second air swirl-flow devices 14, wind path 10 exit is provided with down the enlarging 8 of " people " font and zigzag vertically and concave-concave male structure smooth combustion apparatus 16 radially, and inward eddy secondary air channel 12 exits and outer eddy flow secondary air channel 13 exits are respectively equipped with taper enlarging 9 and taper enlarging 17.

Described taper Pulverized Coal Concentration device 5 is composed in series by one or more taper eseparation rings, the more microscler one-tenth axial transitions of last eseparation ring afterbody district, each taper eseparation ring is the bullet that the import cross section is large, the outlet is little of a hollow, its large end in import cross section places the flow path direction that comes of a wind, and its outlet places the flow path direction that goes of a wind.

Described star Pulverized Coal Concentration device 7 comprises that arranged concentric is in the cylindrical section 25 in center wind duct 2 outsides, cylindrical section 25 is connected with center wind duct by gripper shoe 19 connections, cylindrical section 25 outsides dispose panel-like member 18, and panel-like member 18 is comprised of the leading edge portion, core, the rear edge part that connect successively.The leading edge portion of described panel-like member 18 is narrow and long than rear edge part, and core is long to be leading edge portion and rear edge part part in smoothing junction; The core side is writing board shape, and burner axis is positioned at this plate level.

Described " people " font enlarging 8 comprises short pin 26 and long pin 27, short pin 26 is a wind path 10 prolongation, long pin 27 is arranged in short pin 26 outsides and is 5~10 ° with short pin 26, and direct-current secondary wind expands outwardly by long pin 27, reduces NO thereby prolong the reducing zone size XThe discharging, and between short pin 26 and long pin 27 angles the little recirculating zone of stroke, the reinforcement coal powder ignition.

Described zigzag vertically and radially concave-concave male structure smooth combustion apparatus 16 is a circulus, be spaced dense phase pulverized coal on it and surely fired tooth 20 and dilute phase coal-powder steady flame tooth 21, said dense phase pulverized coal is surely fired the length of tooth 20 less than the length of dilute phase coal-powder steady flame tooth 21, said dense phase pulverized coal is surely fired the thickness of tooth 20 greater than the thickness of dilute phase coal-powder steady flame tooth 21, configuration one through hole 28 on the said dilute phase coal-powder steady flame tooth 21, the vertically and radially concave-concave male structure of overall indention.

Described inward eddy Secondary Air swirl-flow devices 6 is axial adjustable cyclone.

Described outer second air swirl-flow devices 14 is tangential adjustable cyclone.

The present invention utilizes NO XThe reduction reaction method reduces NO XDischarging, namely in flame, form an oxygen deprivation zone that oxygen content is lower, the NO that burning produces XThe NO that nitrogenous composition produces in by coal dust in the reduction flame region XReducing substances (ammonia, hydrogen cyanide etc.) is reduced into harmless nitrogen molecular, thereby reduces the NO that flame produces XFor reaching above purpose, the present invention is except adopting grading combustion technology, and key is coal dust is ignited rapidly and to accelerate the consumption of oxygen, thereby enlarges NO XThe reducing zone.

For the coal dust that can ignite rapidly, the present invention is mainly by following measure: the light breeze airflow in dense peripheries in the middle of 1) forming by taper Pulverized Coal Concentration device 5 forms in the circumferential direction of the circle deep or light alternate and breeze airflow that core is dense by star Pulverized Coal Concentration device 7 again.Because high concentration pulverized coal is distributed in the burner center line radially, in case peripheral thick coal culm catches fire, then can realize the high speed propagation of flame from the periphery to the middle part.2) wind path 10 nozzle adopts zigzag vertically and concave-concave male structure smooth combustion apparatus 16 radially, the steady combustion of thick coal culm outlet tooth protrudes and is highly lower, the steady combustion of thin powdered coal outlet mark of mouth falls into and is highly slightly high, can strengthen coal powder ignition smooth combustion, can reduce again gas-flow resistance, alleviate wearing and tearing, increase the service life of tooth.3) introduce direct-current secondary wind and " people " font enlarging 8 of falling, regulate the inner second air baffle plate so that direct-current secondary wind has suitable speed, guarantee that direct-current secondary wind has enough rigidity, adopt " people " font enlarging 8 further to increase direct-current secondary wind range; The introducing meeting of direct current wind is being equivalent to have increased a gaseous state bluff body in a wind exit, promote high-temperature flue gas to a general mood stream root recirculate mixing, but form the lower slightly transition region of one deck oxygen supply, postponed mixing of wind and inner second air, proper extension NO XNO has further been reduced in the reducing zone XProduce.

Description of drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is the structural representation of taper Pulverized Coal Concentration device 5 of the present invention.

Fig. 3 (a) is the three-dimensional structure schematic diagram of star Pulverized Coal Concentration device 7 of the present invention.

Fig. 3 (b) is the front-view schematic diagram of star Pulverized Coal Concentration device 7 of the present invention.

Fig. 3 (c) is the schematic top plan view of star Pulverized Coal Concentration device 7 of the present invention.

Fig. 4 is the structural representation of " people " font enlarging 8 of the present invention.

Fig. 5 (a) is the three-dimensional structure schematic diagram of smooth combustion apparatus 16 of the present invention.

Fig. 5 (b) is the front-view schematic diagram of smooth combustion apparatus 16 of the present invention.

Fig. 5 (c) is the schematic rear view of smooth combustion apparatus 16 of the present invention.

Fig. 6 is the design sketch of Pulverized Coal Concentration device of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

Referring to Fig. 1, a kind of compound deep or light three transfer the low NO of wind XVortex burner, comprise oil gun 1, in oil gun 1 outside from inside to outside successively arranged concentric center wind duct 2 is arranged, a wind path 10, interior direct-current secondary wind passage 11, inward eddy secondary air channel 12, outer eddy flow secondary air channel 13, in wind path 10, along general mood flow path direction successively arranged concentric wear ring 3 is arranged, taper Pulverized Coal Concentration device 5 and star Pulverized Coal Concentration device 7, inward eddy secondary air channel 12 import departments are provided with interior direct-current secondary wind and transfer windshield plate 4, be provided with inward eddy Secondary Air swirl-flow devices 6 in the inward eddy secondary air channel 12, described inward eddy Secondary Air swirl-flow devices 6 is axial adjustable cyclone; Outer eddy flow secondary air channel 13 porch ecto-entads are disposed with outer second air and transfer windshield plate 15 and outer second air swirl-flow devices 14, and described outer second air swirl-flow devices 14 is tangential adjustable cyclone; Wind path 10 exit is provided with down the enlarging 8 of " people " font and zigzag vertically and concave-concave male structure smooth combustion apparatus 16 radially, and inward eddy secondary air channel 12 exits and outer eddy flow secondary air channel 13 exits are respectively equipped with taper enlarging 9 and taper enlarging 17.

Referring to Fig. 2, taper Pulverized Coal Concentration device 5 of the present invention is composed in series by one or more taper eseparation rings, the more microscler one-tenth axial transitions of last eseparation ring afterbody district, each taper eseparation ring is the bullet that the import cross section is large, the outlet is little of a hollow, its large end in import cross section places the flow path direction that comes of a wind, and its outlet places the flow path direction that goes of a wind.

Referring to Fig. 3, star Pulverized Coal Concentration device 7 of the present invention comprises that arranged concentric is in the cylindrical section 25 in center wind duct 2 outsides, cylindrical section 25 is connected with center wind duct by gripper shoe 19 connections, cylindrical section 25 outsides dispose panel-like member 18, and panel-like member 18 is comprised of the leading edge portion, core, the rear edge part that connect successively.The leading edge portion of described panel-like member 18 is narrow and long than rear edge part, and core is long to be leading edge portion and rear edge part part in smoothing junction; The core side is writing board shape, and burner axis is positioned at this plate level.

Referring to Fig. 4, " people " font enlarging 8 of the present invention comprises short pin 26 and long pin 27, and short pin 26 is a wind path 10 prolongation, and long pin 27 is arranged in short pin 26 outsides and is 5~10 ° with short pin 26, direct-current secondary wind expands outwardly by long pin 27, reduces NO thereby prolong the reducing zone size XThe discharging, and between short pin 26 and long pin 27 angles the little recirculating zone of stroke, the reinforcement coal powder ignition.

Referring to Fig. 5, zigzag among the present invention vertically and radially concave-concave male structure smooth combustion apparatus 16 is a circulus, be spaced dense phase pulverized coal on it and surely fired tooth 20 and dilute phase coal-powder steady flame tooth 21, said dense phase pulverized coal is surely fired the length of tooth 20 less than the length of dilute phase coal-powder steady flame tooth 21, said dense phase pulverized coal is surely fired the thickness of tooth 20 greater than the thickness of dilute phase coal-powder steady flame tooth 21, configuration one through hole 28 on the said dilute phase coal-powder steady flame tooth 21, the vertically and radially concave-concave male structure of overall indention.

Referring to Fig. 6, the light breeze airflow in dense periphery in the middle of the present invention forms by taper Pulverized Coal Concentration device 5, form in the circumferential direction of the circle deep or light alternate and breeze airflow that core is dense by star Pulverized Coal Concentration device 7 again, comprising center concentrated phase area 23, circumferentially concentrated phase area 22, circumferential dilute-phase zone 24.Because high concentration pulverized coal is distributed in the burner center line radially, in case peripheral circumferentially concentrated phase area 22 coal powder ignitions, the center concentrated phase area 23 that then can ignite rapidly, thus realize the high speed propagation of flame from the periphery to the middle part, be conducive to ignition of coal inferior and burning.

The present invention utilizes NO XThe reduction reaction method reduces NO XDischarging, namely in flame, form an oxygen deprivation zone that oxygen content is lower, the NO that burning produces XThe NO that nitrogenous composition produces in by coal dust in the reduction flame region XReducing substances (ammonia, hydrogen cyanide etc.) is reduced into harmless nitrogen molecular, thereby reduces the NO that flame produces XFor reaching above purpose, the present invention is except adopting grading combustion technology, and key is coal dust is ignited rapidly and to accelerate the consumption of oxygen, thereby enlarges NO XThe reducing zone.

For the coal dust that can ignite rapidly, the present invention is mainly by following measure:

1) by the light breeze airflow (radially deep or light) in dense periphery, taper Pulverized Coal Concentration device 5 formation centers, forms in the circumferential direction of the circle deep or light alternate and breeze airflow (circumferentially deep or light) that core is dense by star Pulverized Coal Concentration device 7 again.Because high concentration pulverized coal is distributed in the burner center line radially, in case peripheral thick coal culm catches fire, then can realize the high speed propagation of flame from the periphery to the middle part.

2) wind path 10 nozzle adopts zigzag vertically and concave-concave male structure smooth combustion apparatus 16 radially.Thick coal culm 22 outlet dense phase pulverized coal are fired surely that tooth 20 protrudes vertically and are highly lower, thin powdered coal 24 outlet dilute phase coal-powder steady flame teeth 21 are depression and highly slightly high vertically, can increase coal dust and contact the circumference area with air, strengthen coal powder ignition smooth combustion, can reduce again gas-flow resistance, alleviate wearing and tearing, increase the service life of tooth.

3) introduce direct-current secondary wind passage 11 and " people " font enlarging 8 of falling.Direct-current secondary windshield plate 4 guarantees that direct-current secondary wind has enough rigidity so that direct-current secondary wind 11 has suitable speed in regulating, and adopts " people " font enlarging 8 further to increase direct-current secondary wind range.The introducing meeting of direct current wind is being equivalent to have increased a gaseous state bluff body in a wind exit, promote high-temperature flue gas to a general mood stream root recirculate mixing, but form the lower slightly transition region of one deck oxygen supply, postponed mixing of wind and inner second air, suitably expanded NO XNO has further been reduced in the reducing zone XProduce.

Comprehensive above 3 measures and grading combustion technology, the present invention can accomplish extremely to hang down NO XDischarging is well below environmental emission standard.

Zigzag arranges different tooth depths with concave-concave male structure smooth combustion apparatus 16 radially according to the concentration of breeze airflow is different vertically among the present invention, thick coal culm 22 outlet dense phase pulverized coal fire surely that tooth 20 protrudes vertically and highly lower (only providing igniting required high temperature gases recirculating amount), and thin powdered coal 24 outlet dilute phase coal-powder steady flame teeth 21 cave in and center drilling height slightly high (the required oxygen that catches fire rapidly only is provided) vertically.Because the concentrated phase area tooth is low, the perforate of dilute-phase zone tooth, so whole smooth combustion apparatus is less to the resistance that burner brings.

Claims (8)

1. transfer the low NO of wind for one kind compound deep or light three XVortex burner, comprise oil gun (1), it is characterized in that: in oil gun (1) outside from inside to outside successively arranged concentric center wind duct (2) is arranged, a wind passage (10), interior direct-current secondary wind passage (11), inward eddy secondary air channel (12), outer eddy flow secondary air channel (13), in a wind passage (10), along general mood flow path direction successively arranged concentric wear ring (3) is arranged, taper Pulverized Coal Concentration device (5) and star Pulverized Coal Concentration device (7), interior direct-current secondary wind passage (11) import department is provided with interior direct-current secondary wind and transfers windshield plate (4), be provided with inward eddy Secondary Air swirl-flow devices (6) in the inward eddy secondary air channel (12), outer eddy flow secondary air channel (13) porch ecto-entad is disposed with outer second air and transfers windshield plate (15) and outer second air swirl-flow devices (14), a wind passage (10) exit is provided with down " people " font enlarging (8) and zigzag vertically and concave-concave male structure smooth combustion apparatus (16) radially, inward eddy secondary air channel (12) exit and outer eddy flow secondary air channel (13) exit are respectively equipped with taper enlarging (9,17).
2. according to claim 1 a kind of compound deep or light three transfer the low NO of wind XVortex burner, it is characterized in that: described taper Pulverized Coal Concentration device (5) is composed in series by one or more taper eseparation rings, the more microscler one-tenth axial transitions of last eseparation ring afterbody district, each taper eseparation ring is the bullet that the import cross section is large, the outlet is little of a hollow, its large end in import cross section places the flow path direction that comes of a wind, and its outlet places the flow path direction that goes of a wind.
3. according to claim 1 a kind of compound deep or light three transfer the low NO of wind XVortex burner, it is characterized in that: described star Pulverized Coal Concentration device (7) comprises that arranged concentric is in the cylindrical section (25) in center wind duct (2) outside, cylindrical section (25) is connected 2 with center wind duct) connect by gripper shoe (19), cylindrical section (25) outside disposes panel-like member (18), and panel-like member (18) is comprised of the leading edge portion, core, the rear edge part that connect successively.
4. according to claim 3 a kind of compound deep or light three transfer the low NO of wind XVortex burner is characterized in that: the leading edge portion of described panel-like member (18) is narrow and long than rear edge part, and core is long to be leading edge portion and rear edge part part in smoothing junction; The core side is writing board shape, and burner axis is positioned at this plate level.
5. according to claim 1 a kind of compound deep or light three transfer the low NO of wind XVortex burner, it is characterized in that: described " people " font enlarging (8) comprises short pin (26) and long pin (27), short pin (26) is a wind passage (10) prolongation, and long pin (27) is arranged in short pin (26) outside and is 5~10 ° with short pin (26).
6. according to claim 1 a kind of compound deep or light three transfer the low NO of wind XVortex burner, it is characterized in that: described zigzag vertically and radially concave-concave male structure smooth combustion apparatus (16) is a circulus, be spaced dense phase pulverized coal on it and surely fired tooth (20) and dilute phase coal-powder steady flame tooth (21), said dense phase pulverized coal is surely fired the length of tooth (20) less than the length of dilute phase coal-powder steady flame tooth (21), said dense phase pulverized coal is surely fired the thickness of tooth (20) greater than the thickness of dilute phase coal-powder steady flame tooth (21), the upper configuration of said dilute phase coal-powder steady flame tooth (21) one through hole (28), the vertically and radially concave-concave male structure of overall indention.
7. according to claim 1 a kind of compound deep or light three transfer the low NO of wind XVortex burner is characterized in that: described inward eddy Secondary Air swirl-flow devices (6) is axial adjustable cyclone.
8. according to claim 1 a kind of compound deep or light three transfer the low NO of wind XVortex burner is characterized in that: described outer second air swirl-flow devices (14) is tangential adjustable cyclone.
CN2010105064266A 2010-10-13 2010-10-13 Composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner CN102062396B (en)

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WO2015103831A1 (en) * 2014-01-13 2015-07-16 徐州燃控科技股份有限公司 Fuel/gas-saving ignition and stable-combustion low-nitrogen swirling pulverized coal combustor
WO2015103832A1 (en) * 2014-01-13 2015-07-16 徐州燃控科技股份有限公司 Classification strengthened low nox pulverized coal burner

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CN102252338A (en) * 2011-06-08 2011-11-23 西安交通大学 Concentric double-casing strong-turbulence secondary air spray pipe structure
CN102500551A (en) * 2011-09-29 2012-06-20 华中科技大学 Device for separating rough and fine coal powder in pipeline
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CN105737145B (en) * 2016-02-26 2017-11-03 郑州轻工业学院 One kind reinforcing concentrated type vortex burner
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WO2015103831A1 (en) * 2014-01-13 2015-07-16 徐州燃控科技股份有限公司 Fuel/gas-saving ignition and stable-combustion low-nitrogen swirling pulverized coal combustor
WO2015103832A1 (en) * 2014-01-13 2015-07-16 徐州燃控科技股份有限公司 Classification strengthened low nox pulverized coal burner

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