CN102537951B - Central diffusion type tiny-oil ignition combustor - Google Patents
Central diffusion type tiny-oil ignition combustor Download PDFInfo
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- CN102537951B CN102537951B CN 201210045338 CN201210045338A CN102537951B CN 102537951 B CN102537951 B CN 102537951B CN 201210045338 CN201210045338 CN 201210045338 CN 201210045338 A CN201210045338 A CN 201210045338A CN 102537951 B CN102537951 B CN 102537951B
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- airduct
- vortex
- pulverized coal
- controllable
- bluff body
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Abstract
The invention discloses a central diffusion type tiny-oil ignition combustor. An inner primary air pipe is mounted in a main primary air pipe, one section of the main primary air pipe extends into a tertiary pulverized coal combustion chamber, another section of the main primary air pipe is mounted in the inner primary air pipe, a pulverized coal concentration cone and a vortex-controllable flameexpanding blunt body are sequentially mounted in the inner primary air pipe along a flowing direction of fluid, and are coaxially installed; a small section of an L-shaped ignition oil gun in an abrasion-resistant sleeve is aligned with a cone of the vortex-controllable flame expanding blunt body, a small section of an L-shaped air inlet pipe is aligned with the bottom end of the vortex-controllable flame expanding blunt body in a hollow structure, air outlet holes are circumferentially uniformly distributed at the bottom end of the vortex-controllable flame expanding blunt body, and a plurality of circular secondary air inlet holes are equidistantly arranged on a closed end surface of the tertiary pulverized coal combustion chamber. High-temperature flame ejected by the ignition oil gun is ejected onto the flame expanding blunt body, and is obliquely diffused along the outer edge of the blunt body to a wall surface of a round pipe, ignition around a ring surface is realized, and ignition efficiency is greatly improved. In addition, the vortex-controllable flame expanding blunt body can control the size of a high-temperature backflow area formed at an outlet of a primary combustion chamber, so that fuel adaptability can be enhanced.
Description
Technical field
The present invention relates to a kind of coal burner, especially relate to a kind of central diffusion type tiny-oil ignition combustor.
Background technology
The conventional method of heat power station boiler startup and low-load combustion-stabilizing is to adopt large oil gun to throw oily radiator, combustion-supporting mode.Different according to the type of furnace, the boiler cold-state startup needs to drop into fuel oil 50～200T throw the coal dust on-load from lighting a fire to during.And adopt the tiny-oil ignition combustion supporting technology, according to the principle that energy amplifies step by step, available high energy oil gun is directly lighted a small amount of coal dust, then lights step by step more coal dust; Thereby can realize ignition of the boiler with the oil of trace when realizing the startup of boiler black furnace, and stablize boiler combustion with the oil of trace when blowing out, underload and ultra-low load steady combustion, according to the difference of coal, oil-saving effect generally can reach 60～98%.At present, China has obtained considerable achievement in the tiny-oil ignition technical field, has accumulated rich experience.Chinese patent ZL03255982.8, ZL200520145352.2, ZL200710156019.5 etc. have announced several multi-form little oil burners, and these burners are in the strong point that has aspect realization tiny-oil ignition and the low-load combustion-stabilizing separately; But the oil gun arrangement that such burner adopts, so that thermal-flame is to the heating of coal dust or single-point heating, or multipoint heating, this just causes heat time heating time long, requires the longer dimension of whole coal burner.This is difficult to accomplish for considerable power plant, thereby can cause the reduction of burner outlet coal dust burn-off rate; This just greatly reduces the stability of igniting, even cause can't normal ignition.Little oil burner of the present invention adopts the strategy of " blooming in the center ", has changed igniting theory in the past, so that burner becomes the igniting of anchor ring formula, has greatly improved ignition effectiveness, has shortened the duration of ignition.
Summary of the invention
The object of the present invention is to provide a kind of central diffusion type tiny-oil ignition combustor, it can significantly improve combustion stability, and has good fuel tolerance.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
The present invention includes a main airduct, an interior airduct, Pulverized Coal Concentration cone, L-type torch oil gun, Controllable-vortex expansion flame bluff body and three grades of pulverized coal combustors; An interior airduct is installed in the main airduct, one section of a main airduct is stretched at three grades of coal dust firings indoor, in the interior airduct of installing in another section of a main airduct, along fluid flow direction Pulverized Coal Concentration cone and Controllable-vortex expansion flame bluff body are housed successively, a main airduct, an interior airduct, Pulverized Coal Concentration cone, Controllable-vortex expand flame bluff body and three grades of coaxial installations of pulverized coal combustor; Antiwear casing vertically stretches in a main airduct, the interior airduct, the segment coaxial alignment Controllable-vortex of the L-type torch oil gun in the Antiwear casing expands the tapering of flame bluff body, the L-type blast pipe blast pipe that adds Antiwear casing vertically stretches in a main airduct, the interior airduct, the Controllable-vortex of the segment coaxial alignment hollow-core construction of L-type blast pipe expands the bottom of flame bluff body, the bottom that Controllable-vortex expands the flame bluff body is uniform exhaust vent in the circumferential direction of the circle, three grades of pulverized coal combustors are at the end face that is connected with a main airduct, and five equilibrium has a plurality of circular Secondary Air fresh air inlets in the circumferential direction of the circle.
Described Pulverized Coal Concentration cone radial section is circular, and axial cross section is half elliptic.
The beneficial effect that the present invention has is:
The Pulverized Coal Concentration cone that the present invention arranges in interior airduct import department can make the coal air mixture that enters a wind inner tube concentrated, along on the anchor ring at pipe wall place, enrichment thick coal culm; And the thermal-flame of torch oil gun ejection is sprayed onto on the expansion flame bluff body along the oblique pipe wall place that diffuses to of bluff body outer rim, at whole circumferencial direction, carry out strong turbulent matter, heat exchange with the thick coal culm air-flow in the incoming flow, heat rapidly coal dust, and can to a certain degree prolong time of staying of coal dust, thereby realized the igniting of anchor ring formula, greatly improved ignition effectiveness; Although Controllable-vortex expands flame bluff body size necessarily, but can be by entering the air quantity of bluff body inside, the circular cone build air curtain size that bluff body is outwards sprayed changes, objectively be equivalent to be provided with the adjustable bluff body of size, therefore, can control the high temperature recirculation zone size that first-stage firing chamber goes out interruption-forming, like this, just can adjust the air quantity in the central air hose according to coal-fired volatile matter size, reach the effect that adapts to coal dust firing.In addition, Controllable-vortex expands the existence of flame bluff body, has further prolonged the time of staying of coal dust in burner, improves combustion stability, and high velocity stream has good cooling effect through the air of bluff body to bluff body simultaneously, to guarantee the security of bluff body work.The central diffusion type micro-oil ignition coal powder combusting device that the present invention provides not only can be used as start-up burner, but also can be used as the burner of main burner and low-load combustion-stabilizing.
Description of drawings
Fig. 1 is the structural front view of central diffusion type tiny-oil ignition combustor of the present invention.
Fig. 2 is the structure side view of central diffusion type tiny-oil ignition combustor of the present invention.
Among the figure: airduct in airduct of 1-master, 2-, 3-Pulverized Coal Concentration cone, 3.1-fixing muscle, 3.1-is muscle fixedly, 4-L type torch oil gun, 4.1-Antiwear casing, the 5-Controllable-vortex expands flame bluff body, 5.1-exhaust vent, 5.2-blast pipe, 5.3-is muscle fixedly, the 6-first-stage firing chamber, 7-secondary combustion chamber, 7.1-fixing muscle, three grades of combustion chambers of 8-, 8.1-Secondary Air fresh air inlet.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1 and Figure 2, the present invention includes a main airduct 1, an interior airduct 2, Pulverized Coal Concentration cone 3, L-type torch oil gun 4, Controllable-vortex expansion flame bluff body 5 and three grades of pulverized coal combustors 8; An interior airduct 2 is installed in the main airduct 1, one section of a main airduct 1 is stretched in three grades of pulverized coal combustors 8, in the interior airduct of installing in another section of a main airduct 1, along fluid flow direction Pulverized Coal Concentration cone 3 and Controllable-vortex expansion flame bluff body 5 are housed successively, a main airduct 1, an interior airduct 2, Pulverized Coal Concentration cone 3, Controllable-vortex expand flame bluff body 5 and three grades of pulverized coal combustor 8 coaxial installations; Antiwear casing 4.1 vertically stretches into main airduct 1, in the interior airduct 2, the segment coaxial alignment Controllable-vortex of the L-type torch oil gun 4 in the Antiwear casing 4.1 expands the tapering of flame bluff body 5, L-type blast pipe 5.2 blast pipes that add Antiwear casing vertically stretch into main airduct 1, in the interior airduct 2, the Controllable-vortex of the segment coaxial alignment hollow-core construction of L-type blast pipe 5.2 expands the bottom of flame bluff body 5, the bottom that Controllable-vortex expands flame bluff body 5 is uniform exhaust vent 5.1 in the circumferential direction of the circle, and angle is greater than angle between bluff body conical surface cycloid and burner main shaft between exhaust vent axis and burner main shaft.Three grades of pulverized coal combustors 8 are at the end face that is connected with a main airduct 1, and five equilibrium has a plurality of circular Secondary Air fresh air inlets 8.1 in the circumferential direction of the circle.
Described Pulverized Coal Concentration is bored 3 radial sections for circular, and axial cross section is half elliptic, and three roads by being distributed in circumferencial direction between Pulverized Coal Concentration cone and the interior airduct fixedly muscle 3.1 are connected; Described Controllable-vortex expand between flame bluff body 5 and the interior airduct by being distributed in circumferencial direction three roads fixedly muscle 5.3 be connected.
An interior airduct 2 and one-level pulverized coal combustor 6 are same segment pipe, be installed in the main airduct 1, fixedly muscle 7.1 connections of three roads by being distributed in circumferencial direction therebetween, close incoming flow end at an interior airduct 2, Pulverized Coal Concentration cone 3 is housed, its with an interior airduct 2 between by being distributed in circumferencial direction three roads fixedly muscle 3.1 be connected, near being L-type torch oil gun 4 after the Pulverized Coal Concentration cone 3, be thereafter that Controllable-vortex expands flame bluff body 5.A main airduct 1 is same segment pipe with secondary pulverized coal combustor 7, can be regarded as secondary combustion chamber 7 from first-stage firing chamber 6 exits, and its rear end is stretched in three grades of pulverized coal combustors 8.
Situation is as follows during central diffusion type micro-oil ignition coal powder combusting device real work of the present invention:
A wind carries coal dust and enters main wind passage 1, wherein a part will enter an interior airduct 2, when boring 3 by Pulverized Coal Concentration, breeze airflow is radially concentrated so that along on the anchor ring at pipe wall place, enrichment thick coal culm, according to principle of inertia, when the flow area sudden enlargement of breeze airflow, the thick coal culm air-flow will keep inertia and the concentrated one-level pulverized coal combustor 6 that enters, and the thermal-flame of L-type torch oil gun 4 ejections is sprayed onto on the Controllable-vortex expansion flame bluff body 5 along the oblique pipe wall place that diffuses to of bluff body outer rim, at whole circumferencial direction, carry out strong turbulent matter with the thick coal culm air-flow in the incoming flow, heat exchange, the heating coal dust heats up rapidly and ignition coal dust rapidly; When high-temperature product left the one-level pulverized coal combustor, because the effect of bluff body will make high-temperature flue gas and the deflection of unburned breeze airflow generation umbrella, its effect had three: one, the contact heat transfer process of enhancing and peripheral breeze airflow, and reinforcement is caught fire; The 2nd, prolong the time of staying of coal dust in one-level pulverized coal combustor 6, promote the process of catching fire; The 3rd, form a stable high temperature recirculation zone at the bluff body rear portion, thereby improve the combustion stability of breeze airflow.The angle of the umbrella deflection that air-flow produces can be adjusted by the gas flow in the increase and decrease central air hose, as to the less anthracite that is difficult to catch fire of volatile matter, can strengthen the gas flow in the central air hose, thereby entrainment more high-temperature flue gas to form larger vortex, thereby and make stronger hybrid perturbation and strengthen ignition process.Because the content of a general mood stream Air only accounts for 20% ~ 40% of total blast volume, and in the thick coal culm, AIR Proportional is less, so the indoor further burning that might hinder owing to anoxic fuel of one-level coal dust firing, and this part eddy current wind then can partly remedy this deficiency.The high temperature that enters secondary pulverized coal combustor 7 will heat and light the residue breeze airflow in the secondary pulverized coal combustor 7, then the breeze airflow of being lighted together enters three grades of pulverized coal combustors 8, under the secondary wind action that replenishes, burn away and the afterburnt sprays into burner hearth to a certain extent.The sparking mode of this form has prolonged the time of staying of coal dust to a certain extent, and has realized the igniting of anchor ring formula, has greatly improved ignition effectiveness; Although Controllable-vortex expands flame bluff body size necessarily, but can be by entering the air quantity of bluff body inside, the circular cone build air curtain size that bluff body is outwards sprayed changes, objectively be equivalent to be provided with the adjustable bluff body of size, therefore, can control the high temperature recirculation zone size that first-stage firing chamber goes out interruption-forming, like this, just can adjust the air quantity in the central air hose according to coal-fired volatile matter size, reach the effect that adapts to coal dust firing.In addition, Controllable-vortex expands the existence of flame bluff body, has further prolonged the time of staying of coal dust in burner, improves combustion stability, and high velocity stream has good cooling effect through the air of bluff body to bluff body simultaneously.
What more than enumerate only is a specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (2)
1. a central diffusion type tiny-oil ignition combustor is characterized in that: comprise that a main airduct (1), an interior airduct (2), Pulverized Coal Concentration cone (3), L-type torch oil gun (4), Controllable-vortex expand flame bluff body (5) and three grades of pulverized coal combustors (8); An interior airduct (2) is installed in the main airduct (1), one section of a main airduct (1) is stretched in three grades of pulverized coal combustors (8), in the interior airduct of installing in another section of a main airduct (1), along fluid flow direction Pulverized Coal Concentration cone (3) and Controllable-vortex expansion flame bluff body (5) are housed successively, a main airduct (1), an interior airduct (2), Pulverized Coal Concentration cone (3), Controllable-vortex expand flame bluff body (5) and the coaxial installation of three grades of pulverized coal combustors (8); Antiwear casing (4.1) vertically stretches into a main airduct (1), in the interior airduct (2), the segment coaxial alignment Controllable-vortex of the L-type torch oil gun (4) in the Antiwear casing (4.1) expands the tapering of flame bluff body (5), L-type blast pipe (5.2) blast pipe that adds Antiwear casing vertically stretches into a main airduct (1), in the interior airduct (2), the Controllable-vortex of the segment coaxial alignment hollow-core construction of L-type blast pipe (5.2) expands the bottom of flame bluff body (5), the bottom that Controllable-vortex expands flame bluff body (5) is uniform exhaust vent (5.1) in the circumferential direction of the circle, three grades of pulverized coal combustors (8) are at the end face that is connected with a main airduct (1), and five equilibrium has a plurality of circular Secondary Air fresh air inlets (8.1) in the circumferential direction of the circle.
2. a kind of central diffusion type tiny-oil ignition combustor according to claim 1 is characterized in that: described Pulverized Coal Concentration cone (3) radial section is for circular, and axial cross section is half elliptic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210045338 CN102537951B (en) | 2012-02-27 | 2012-02-27 | Central diffusion type tiny-oil ignition combustor |
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| CN 201210045338 CN102537951B (en) | 2012-02-27 | 2012-02-27 | Central diffusion type tiny-oil ignition combustor |
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| CN102537951A CN102537951A (en) | 2012-07-04 |
| CN102537951B true CN102537951B (en) | 2013-10-23 |
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| CN103123113A (en) * | 2013-01-24 | 2013-05-29 | 孙公钢 | Double-rotational-flow industrial boiler pulverized coal burner with back-blowing device |
| WO2014179956A1 (en) * | 2013-05-09 | 2014-11-13 | Zheng Shi | System and method for small-scale combustion of pulverized solid fuels |
| GB2516868B (en) * | 2013-08-02 | 2017-01-18 | Kiln Flame Systems Ltd | Swirl Burner for Burning Solid Fuel and Method of using same |
| CN103615717B (en) * | 2013-10-24 | 2016-01-13 | 中国计量学院 | A kind of novel oxygen-enriched tiny-oil ignition and steady burning burner in ultra low load |
| CN108916861B (en) * | 2018-09-12 | 2023-09-15 | 段景峰 | Biomass powder controllable turbulence premixed combustion boiler and application method thereof |
| CN108916862A (en) * | 2018-09-12 | 2018-11-30 | 段景峰 | A kind of powdered biomass controlled turbulent lean premixed combustor and its application method |
| CN109985476B (en) * | 2019-03-01 | 2021-05-11 | 中颉化工科技(上海)有限公司 | VOCS device in high-efficient processing toxicity nature gas |
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| JP2781222B2 (en) * | 1989-09-25 | 1998-07-30 | バブコツク日立株式会社 | Pulverized coal combustion equipment |
| CN2235065Y (en) * | 1995-06-09 | 1996-09-11 | 清华大学 | Burner for pulverized coal |
| CN101109507A (en) * | 2006-07-21 | 2008-01-23 | 清华大学 | Little oil ignition horizontal dense-dilute concentration type direct flow pulverized coal burner |
| CN101696802B (en) * | 2009-10-22 | 2011-01-05 | 中国计量学院 | Coal type less oil ignition burner capable of controlling vortex width |
| CN202546752U (en) * | 2012-02-27 | 2012-11-21 | 中国计量学院 | Central diffusion type micro oil ignition burner |
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Granted publication date: 20131023 Termination date: 20140227 |