CN101696802B - Coal type less oil ignition burner capable of controlling vortex width - Google Patents
Coal type less oil ignition burner capable of controlling vortex width Download PDFInfo
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- CN101696802B CN101696802B CN2009101544030A CN200910154403A CN101696802B CN 101696802 B CN101696802 B CN 101696802B CN 2009101544030 A CN2009101544030 A CN 2009101544030A CN 200910154403 A CN200910154403 A CN 200910154403A CN 101696802 B CN101696802 B CN 101696802B
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Abstract
The invention discloses a coal type less oil ignition burner capable of controlling the vortex width. A primary air pipeline of the coal type less oil ignition burner is communicated with a second-stage pulverized coal burning chamber through a pulverized coal condenser; a first-stage pulverized coal burning chamber is arranged in the second-stage pulverized coal burning chamber which extends into a third-stage pulverized coal burning chamber; and the lateral surface of the third-stage pulverized coal burning chamber connected with the second-stage pulverized coal burning chamber is equidistantly provided with a plurality of secondary air inlets. One end of a central air duct of a controllable vortex bluff body is a cavity cone; the central air duct passes through the primary air pipeline, the pulverized coal condenser and the first-stage pulverized coal burning chamber; the cavity cone extends out and is positioned outside the first-stage pulverized coal burning chamber; and the circumference at the bottom of the cavity cone is evenly provided with a plurality of round holes and a plurality of oil burning chambers obliquely and equidistantly pass through the second-stage pulverized coal burning chamber and then are arranged on the first-stage pulverized coal burning chamber. By adopting the controllable vortex bluff body, the invention prolongs the stay time of pulverized coal in the burners and improves the ignition stability. The invention is not only can be used as the ignition burner, but also can be used as a main burner and a burner with lower load and stable burning.
Description
Technical field
The present invention relates to a kind of coal burner, especially relate to a kind of coal type less oil ignition burner capable of controlling vortex width.
Background technology
The conventional method of heat power station boiler startup and low-load combustion-stabilizing is to adopt big oil gun to throw oily radiator, combustion-supporting mode.According to type of furnace difference, 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, lights more coal dust then step by step; 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 etc. have announced several multi-form little oil burners, and these burners are in the strong point that all has aspect realization tiny-oil ignition and the low-load combustion-stabilizing separately; But this class burner has generally all adopted the mode of single-sided arrangement oil gun, and therefore the heating to coal dust is the single face 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, because for the power plant that has put into operation, the position (i.e. the flange position of the flange position in an airduct road and pulverized coal combustor) of placing whole coal burner is fixing, and the higher limit of promptly whole coal burner length is fixed.So when the actual Len req of whole coal burner surpasses higher limit, will 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.ZL200710156019.5 adopts the heavy wool rifle to arrange and has solved the problem of single face heating, but its adaptability to coal still has limitation, lacks adjustability.
Summary of the invention
The object of the present invention is to provide a kind of coal type less oil ignition burner capable of controlling vortex width, it can significantly improve combustion stability, and has the micro-oil ignition coal powder combusting device of good fuel tolerance.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
An end that the present invention includes cross section and be circle and axis coinciding has an airduct road, pulverized coal concentrator, one-level pulverized coal combustor, secondary pulverized coal combustor and three grades of pulverized coal combustors of elbow; One section in airduct road caves in and the pulverized coal concentrator that forms the tapered pipeline of throat is communicated with the secondary pulverized coal combustor, it is indoor that the one-level pulverized coal combustor is installed in the secondary coal dust firing, the secondary pulverized coal combustor stretches at three grades of coal dust firings indoor, and three grades of pulverized coal combustor side five equilibriums that are connected with the secondary pulverized coal combustor have a plurality of secondary wind inlets.Controlled whirlpool bluff body is a central air hose, one end of central air hose is the cavity cone, it is indoor that central air hose is applied in airduct road, pulverized coal concentrator and an one-level coal dust firing, the cavity cone of central air hose stretches out outside one-level pulverized coal combustor end face, have a plurality of circular holes uniformly on the circumference of cavity cone bottom, the oblique five equilibrium of a plurality of oil combustion chambers is installed on the one-level pulverized coal combustor after passing the secondary pulverized coal combustor.
Circularhole diameter on the circumference of described cone bottom is 1～2mm.
Described oil combustion chamber is three, angle between per two oil combustion chamber axis is 120 °, each oil combustion chamber outlet axis and one-level coal dust firing chamber internal surface meet at a bit, crossing the normal of this point and the angle between oil combustion chamber outlet axis is 6～12 °, concrete numerical value will be decided according to the pulverized coal combustor diameter, and three oil combustion chamber outlet axis are tangential on an indoor imaginary circle of coal dust firing.
The beneficial effect that the present invention has is:
Adopt three oil gun arranged tangential, at the feasible one-tenth one rotation torch of one-level coal dust firing chamber interior, this torch can carry out strong turbulent matter, heat exchange with breeze airflow, heats coal dust rapidly, and can to a certain degree prolong the time of staying of coal dust; Though bluff body size in controlled whirlpool is certain, but can be by adjusting the air quantity of central air hose, the circular cone build air curtain size that bluff body is outwards sprayed changes, objectively be equivalent to be provided with the bluff body of adjustable size, therefore, can control the high temperature recirculation zone size that the one-level combustor exit forms, like this, just can adjust the air quantity in the central air hose, reach the effect that adapts to coal dust firing according to coal-fired volatile matter size.
In addition, the existence of controlled whirlpool bluff body has further prolonged the time of staying of coal dust in burner, improves combustion stability.The 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 sectional structure schematic diagram of micro-oil ignition coal powder combusting device of the present invention.
Fig. 2 is that schematic diagram is looked on the right side of Fig. 1.
Fig. 3 is the vertical profile structural representation of controlled whirlpool bluff body.
Fig. 4 is the A-A partial sectional view of Fig. 3.
Among the figure: 1, airduct road, 2, pulverized coal concentrator, 3, oil combustion chamber, 4, the one-level pulverized coal combustor, 5, controlled whirlpool bluff body, 6, the secondary pulverized coal combustor, 7, three grades of pulverized coal combustors, 5.1, central air hose, 5.2, the cavity cone, 5.3, circular hole, 7.1, the secondary wind 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 cross section is an airduct road, pulverized coal concentrator 2, one-level pulverized coal combustor 4, secondary pulverized coal combustor 6 and three grades of pulverized coal combustors 7 that an end of circle and axis coinciding has elbow; Airduct road 1 is communicated with secondary pulverized coal combustor 6 through one section pulverized coal concentrator 2 that caves in and form the tapered pipeline of throat, one-level pulverized coal combustor 4 is installed in the secondary pulverized coal combustor 6, secondary pulverized coal combustor 6 stretches in three grades of pulverized coal combustors 7, and three grades of pulverized coal combustors, the 7 side five equilibriums that are connected with secondary pulverized coal combustor 6 have a plurality of circles or square secondary wind inlet 7.1.Controlled whirlpool bluff body 5 is a central air hose 5.1, one end of central air hose 5.1 is a cavity cone 5.2, central air hose 5.1 is applied in airduct road 1 one time, in pulverized coal concentrator 2 and the one-level pulverized coal combustor 4, the cavity cone 5.2 of central air hose 5.1 stretches out outside one-level pulverized coal combustor 4 end faces, on cavity cone 5.2 bottom circumference, have a plurality of circular holes 5.3 uniformly, after passing secondary pulverized coal combustor 6, a plurality of oil combustion chamber 3 oblique five equilibriums are installed on the one-level pulverized coal combustor 4, central air hose is connected with pressure-air or industrial oxygen source, gas can spray into the combustion chamber from the micropore of bluff body, form the air curtain of a cone shape.
As shown in Figure 3, Figure 4, circular hole 5.3 diameters on the described cone 5.2 bottom circumference are generally 1～2mm, and pitch of holes can be 5～10mm.
As shown in Figure 2, described oil combustion chamber 3 is three, angle between per two oil combustion chamber axis is 120 °, each oil combustion chamber outlet axis and one-level pulverized coal combustor 4 inner surfaces meet at a bit, crossing the normal of this point and the angle between oil combustion chamber outlet axis is 6～12 °, concrete numerical value will be decided according to the pulverized coal combustor diameter, and three oil combustion chamber outlet axis are tangential on an indoor imaginary circle of coal dust firing.
Situation is as follows during micro-oil ignition coal powder combusting device real work of the present invention:
A wind carries coal dust and enters wind passage 1 one time, and when by pulverized coal concentrator 2, breeze airflow is concentrated.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 4 that enters, and circumferential weld entered secondary pulverized coal combustor 6 in the middle of the thin powdered coal air-flow then can deflect and pass the firsts and seconds pulverized coal combustor.From the oily flame of oil combustion chamber 3 ejection will the breeze airflow outside form one directly be washed into around torch the thick coal culm air-flow around, forms violent mass transfer, diabatic process, make the coal dust fire burns that heating up rapidly also; High-temperature product enters secondary pulverized coal combustor 6 after passing controlled whirlpool bluff body, heats and lights residue breeze airflow in the secondary pulverized coal combustor 6.Through bluff body the time, because the flow-disturbing effect of bluff body will make high-temperature flue gas and the deflection of unburned breeze airflow generation umbrella, its effect has three: one, the contact heat transfer process of enhancing and peripheral thin powdered coal air-flow, and reinforcement is caught fire; The 2nd, prolong the time of staying of coal dust in secondary 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 bigger vortex, thereby and make stronger hybrid perturbation and strengthen ignition process.Because the content of air only accounted for 20%～40% of total blast volume during one time general mood flowed, and in the thick coal culm, AIR Proportional is littler, so the indoor further burning that might hinder fuel owing to anoxic of one-level coal dust firing, and this part eddy current wind then can partly remedy this deficiency.Resultant product after the burning of secondary pulverized coal combustor enters three grades of pulverized coal combustors 7 and mixes back further burning, after-flame with the secondary wind that enters by secondary wind inlet 7.1, and final high-temperature flue gas sprays into burner hearth by three grades of pulverized coal combustor outlets.
At last, it is also to be noted that 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 (3)
1. coal type less oil ignition burner capable of controlling vortex width comprises that cross section is an airduct road (1), pulverized coal concentrator (2), one-level pulverized coal combustor (4), secondary pulverized coal combustor (6) and the three grades of pulverized coal combustors (7) that an end of circle and axis coinciding has elbow; An airduct road (1) is communicated with secondary pulverized coal combustor (6) through one section pulverized coal concentrator (2) that caves in and form the tapered pipeline of throat, one-level pulverized coal combustor (4) is installed in the secondary pulverized coal combustor (6), secondary pulverized coal combustor (6) stretches in three grades of pulverized coal combustors (7), and three grades of pulverized coal combustors (7) side five equilibrium that is connected with secondary pulverized coal combustor (6) has a plurality of secondary wind inlets (7.1); It is characterized in that: controlled whirlpool bluff body (5) is a central air hose (5.1), one end of central air hose (5.1) is cavity cone (5.2), central air hose (5.1) is applied in an airduct road (1), in pulverized coal concentrator (2) and the one-level pulverized coal combustor (4), the cavity cone (5.2) of central air hose (5.1) stretches out outside one-level pulverized coal combustor (4) end face, have a plurality of circular holes (5.3) uniformly on the circumference of cavity cone (5.2) bottom, the oblique five equilibrium of a plurality of oil combustion chambers (3) is installed on the one-level pulverized coal combustor (4) after passing secondary pulverized coal combustor (6).
2. a kind of coal type less oil ignition burner capable of controlling vortex width according to claim 1 is characterized in that: circular hole (5.3) diameter on the circumference of described cone (5.2) bottom is 1～2mm.
3. a kind of coal type less oil ignition burner capable of controlling vortex width according to claim 1 is characterized in that: described oil combustion chamber (3) is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101544030A CN101696802B (en) | 2009-10-22 | 2009-10-22 | Coal type less oil ignition burner capable of controlling vortex width |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101544030A CN101696802B (en) | 2009-10-22 | 2009-10-22 | Coal type less oil ignition burner capable of controlling vortex width |
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| CN101696802A CN101696802A (en) | 2010-04-21 |
| CN101696802B true CN101696802B (en) | 2011-01-05 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506423B (en) * | 2011-09-20 | 2015-04-15 | 华北电力大学 | Method for assisting in igniting low-volatile coal in burning by adding oxygen |
| CN102444890B (en) * | 2011-12-26 | 2013-12-25 | 上海锅炉厂有限公司 | Micro-oil ignition burner |
| CN102537951B (en) * | 2012-02-27 | 2013-10-23 | 中国计量学院 | Central diffusion type tiny-oil ignition combustor |
| 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 |
| CN108870385B (en) * | 2018-08-02 | 2023-12-22 | 贵州富燃环保科技有限公司 | Self-stabilizing combustion staged combustion pulverized coal burner |
| CN109780540A (en) * | 2018-12-20 | 2019-05-21 | 武汉武锅能源工程有限公司 | A kind of high speed water mixing low-NOx combustor |
| CN109737393B (en) * | 2019-02-19 | 2024-02-27 | 沈阳环境科学研究院 | Large coal powder concentration ratio postpone mixed type cyclone coal powder burner |
| CN114426262B (en) * | 2020-10-14 | 2024-05-24 | 中国石油化工股份有限公司 | Sulfur recovery combustor |
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Granted publication date: 20110105 Termination date: 20111022 |