CN100532936C - Multiple oil gun rounding arrangement micro-oil ignition coal power combusting device - Google Patents
Multiple oil gun rounding arrangement micro-oil ignition coal power combusting device Download PDFInfo
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- CN100532936C CN100532936C CNB2007101560195A CN200710156019A CN100532936C CN 100532936 C CN100532936 C CN 100532936C CN B2007101560195 A CNB2007101560195 A CN B2007101560195A CN 200710156019 A CN200710156019 A CN 200710156019A CN 100532936 C CN100532936 C CN 100532936C
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- coal powder
- pulverized coal
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Abstract
This invention declares a tangentially positioned tiny-oil ignition coal powder combustor with multiple oil guns including successively connected primary air channel, coal powder concentrator and coal powder combustor with overlapping axis. At least 3 oil combustors are positioned symmetrically on the coal combustor, each has a tiny oil gun at the inlet and a coal powder concentrator connected to the outlet; the axis of the oil combustor has an angle alpha of 40degree-60degree with the primary air channel. The angle beta between the axis of each oil combustor and the normal line through this point is 6-12degree, and all the axes of the oil combustors are tangent with an identical imaginary circle. The tangentially positioned oil guns form a rotary flame that undergoes strong turbulence exchange of mass and heat with the coal powder air flow, which ignites the coal powder rapidly and furthermore heats the coke with part of heat released by the oil combustion, shortens the preheating time and enhances the burnout rate of the coal powder.
Description
Technical field
The present invention relates to a kind of coal burner, belong to igniting of generating plant pulverized coal boiler cold conditions and ultra-low load smooth combustion apparatus; Especially relate to a kind of heavy wool rifle circle of contact and arrange micro-oil ignition coal powder combusting device.
Background technology
China is a petroleum import big country, and in May, 2005, National Development and Reform Committee started Medium-and Long-Term Plan for Conserving Energy Resources, has proposed the Eleventh Five-Year Plan period to save and the target of 3,800 ten thousand tons in alternative oil, is listed in ten big energy conservation project first places.The conventional method of heat power station boiler startup and low-load combustion-stabilizing is to adopt big oil gun to throw the mode of oil; With the 300MW unit is example, and the boiler cold-state startup needs to drop into fuel oil 50～100T 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 70～98%.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.Therefore above-mentioned burners in prior only has adaptability preferably to bituminous coal, the brown coal of high volatile, and its application is subjected to bigger restriction.
Summary of the invention
A kind of heavy wool rifle circle of contact that the purpose of this invention is to provide the ignition time that can shorten fuel is greatly arranged micro-oil ignition coal powder combusting device.
The technical solution adopted for the present invention to solve the technical problems is:
Comprise and being connected successively and wind passage, pulverized coal concentrator and a pulverized coal combustor of central axes.At the first-class oil combustion chamber that is arranged with at least 3 of pulverized coal concentrator, the port of export that the entrance point of each oil combustion chamber is provided with a little oil gun, each oil combustion chamber is connected with pulverized coal concentrator; The angle α of the central axis of the central axis of oil combustion chamber and a wind passage is 40 °～60 °.
Described pulverized coal concentrator is made up of the left side converging transition that is connected successively, middle throat section and right side divergent segment, forms big, the middle little pipeline in two ends, the left and right sides; The left side converging transition is connected with a wind passage, and the right side divergent segment is connected with pulverized coal combustor; On the divergent segment of right side, oil combustion chamber is set.
The central axis of described each oil combustion chamber and the extended line of central axis are 6 °～12 ° with angle β between the normal of right side divergent segment internal face intersection point, and the central axis of each oil combustion chamber is tangential on an indoor imaginary circle of coal dust firing.
The beneficial effect that the present invention has is:
Owing to adopted three oil guns (or four oil guns) arranged tangential, used for reference the corner tangential firing principle of Pulverized Coal fired Boiler Furnace inside, can form a rotation torch in the coal dust firing chamber interior, this torch can carry out strong turbulent matter, heat exchange with breeze airflow, rapid heating coal dust is separated out its volatile matter fast and is burnt the volatile combustion liberated heat, further heat coke with part oil firing liberated heat, make it reach ignition temperature and burn.When traditional single-sided arrangement oil gun has been avoided in this invention far-end fuel is heated disadvantageous drawback, shortened the preheating time before the fuel fire on the whole.Therefore, can in shorter distance, finish preheating of fuel drying and fire burns, improved stability of ignition greatly, avoided to greatest extent because the not enough and coal dust burn-off rate problem on the low side of the not enough Ignition Stability of bringing of whole coal burner length.Use micro-oil ignition coal powder combusting device of the present invention, can keep improving the burn-off rate of coal dust under the constant situation of whole micro-oil ignition coal powder combusting device length.Therefore, micro-oil ignition coal powder combusting device of the present invention 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.
Among the figure: 1, wind passage, 1.1, central axis, 2, pulverized coal concentrator, 2.1, the left side converging transition, 2.2, middle throat section, 2.3, the right side divergent segment, 3, little oil gun, 4, oil combustion chamber, 4.1, entrance point, 4.2, central axis, 4.3, the port of export, 5, the cooling air compartment, 5.1, cooling air inlet, 5.2, cooling air outlet, 6, pulverized coal combustor, 6.1, outlet.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Illustrated in figures 1 and 2, the present invention includes pulverized coal concentrator 2, cross section and be circular pulverized coal combustor 6 for a circular wind passage 1 and cross section.Pulverized coal concentrator 2 is made up of the left side converging transition 2.1 that is connected successively from left to right, middle throat section 2.2 and right side divergent segment 2.3; The vertical section of left side converging transition 2.1 is the isosceles trapezoid that left end is big, right-hand member is little, and the vertical section of right side divergent segment 2.3 is the isosceles trapezoid that left end is little, right-hand member is big; Therefore whole pulverized coal concentrator 2 is big, the middle little circular pipes in two ends, a left and right sides.Left side converging transition 2.1 is connected with a wind passage 1, and right side divergent segment 2.3 is connected with pulverized coal combustor 6.The central axis of the central axis 1.1 of a wind passage 1, the central axis of left side converging transition 2.1, middle throat section 2.2, the central axis of right side divergent segment 2.3 and the central axis of pulverized coal combustor 6 coincide.The said structure of pulverized coal concentrator 2 can guarantee the resistance of oil firing flame to the rapid heating of coal dust and don't the too much whole burner of increase.
The cooling air compartment 5 of tubular is set in the periphery of whole pulverized coal concentrator 2 and pulverized coal combustor 6, and promptly whole pulverized coal concentrator 2 and pulverized coal combustor 6 all are positioned at the inner chamber of cooling air compartment 5.The outer wall sealing of the bottom of cooling air compartment 5 and left side divergent segment 2.1 coincide; Be provided with cooling air inlet 5.1 in the air compartment bottom, the top of cooling air compartment 5 is open, and the cooling air outlet 5.2 of cooling air compartment 5 flushes with the outlet 6.1 of pulverized coal combustor 6.
Three (or four, the present invention is three) oil combustion chambers 4 equidistantly are set on right side divergent segment 2.3 circumference; The port of export 4.3 that is each oil combustion chamber 4 is connected with right side divergent segment 2.3.Oil combustion chamber 4 is positioned at the inner chamber of cooling air compartment 5.The sidewall that little oil gun 3 passes cooling air compartment 5 is connected with the entrance point 4.1 of oil combustion chamber 4; In order to ensure sealing, keep seamlessly coincideing between the sidewall of little oil gun 3 and cooling air compartment 5.The central axis 4.2 of the central axis of little oil gun 3 and oil combustion chamber 4 coincides, and the central axis 4.2 of oil combustion chamber 4 and the central axis of a wind passage 1 1.1 formation α are 40 °～60 ° angle, and for example α is 50 ° a angle.Angle β is 6～12 ° between the normal of the central axis 4.2 of each oil combustion chamber and this point of mistake, and the central axis 4.2 of each oil combustion chamber is tangential on an indoor imaginary circle 7 of coal dust firing.
Situation is as follows during micro-oil ignition coal powder combusting device real work of the present invention:
Pour into cooling air from the cooling air inlet 5.1 of cooling air compartment 5, be used for the pulverized coal concentrator 2 that is positioned at cooling air chamber 5 inner chambers and the wall of pulverized coal combustor 6 are cooled off, prevent that wall temperature is too high.Cooling air after being heated flows out from the cooling air outlet 5.2 of cooling air compartment 5.
A wind carries coal dust and enters wind passage 1 one time, and when by middle throat section 2.2, breeze airflow is concentrated.When further by right side divergent segment 2.3, according to principle of inertia, when the flow area sudden enlargement of breeze airflow, the thick coal culm air-flow will keep inertia and concentrate on the pulverized coal combustor 6 middle parts central axis of pulverized coal combustor 6 (promptly near), and the thin powdered coal air-flow then can deflect and focus on the adherent place of pulverized coal combustor 6.Like this, from the oily flame of oil combustion chamber 4 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; Finally the outlet 6.1 from pulverized coal combustor 6 sprays.Owing to adopted three oil guns (or four oil guns) arranged tangential, used for reference the corner tangential firing principle of Pulverized Coal fired Boiler Furnace inside, at the feasible one-tenth one rotation torch of coal dust firing chamber interior, this torch can carry out strong turbulent matter, heat exchange with breeze airflow, rapid heating coal dust is separated out its volatile matter fast and is burnt the volatile combustion liberated heat, further heat coke with part oil firing liberated heat, make it reach ignition temperature and burn.Therefore arrange with traditional single oil gun and compare that the catching fire to be caught fire by single face of coal dust becomes anchor ring and catch fire, and stablizes fast.On the other hand, when single oil gun is arranged, because the momentum effect of oily flame, main breeze airflow can be blown the aerodynamic structure that destroys partially in the pulverized coal combustor 6, thereby cause the wall overtemperature even the slagging scorification of the pulverized coal combustor 6 on oil gun opposite, this is common problem in actual moving process in the past.Micro-oil ignition coal powder combusting device of the present invention, owing to adopted three oil guns (or four oil guns) arranged tangential, therefore can fundamentally address this problem, can greatly improve the air force operating mode of pulverized coal combustor 6 inside, make pulverized coal combustor 6 inside that good flame degree of filling be arranged, basically eliminated vortex district and dead area, avoided the pulverized coal combustor 6 walls bigger thermal stress of generation and reduced intensity.Moreover the wall place that the thin powdered coal air-flow concentrates on pulverized coal combustor 6 can prevent effectively that pulverized coal combustor 6 wall temperatures are too high, thereby plays protection pulverized coal combustor 6 and the effect of avoiding pulverized coal combustor 6 wall slagging scorification.
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, a kind of heavy wool rifle circle of contact is arranged micro-oil ignition coal powder combusting device, comprise and being connected successively and a wind passage (1), pulverized coal concentrator (2) and the pulverized coal combustor (6) of central axes, it is characterized in that: at the first-class oil combustion chamber (4) that is arranged with at least 3 of pulverized coal concentrator (2), the port of export (4.3) that the entrance point (4.1) of each oil combustion chamber (4) is provided with a little oil gun (3), each oil combustion chamber (4) is connected with pulverized coal concentrator (2); The central axis (4.2) of oil combustion chamber (4) is 40 °～60 ° with the angle (α) of the central axis (1.1) of a wind passage (1).
2, a kind of heavy wool rifle circle of contact according to claim 1 is arranged micro-oil ignition coal powder combusting device, it is characterized in that: described pulverized coal concentrator (2) is made up of the left side converging transition (2.1) that is connected successively, middle throat section (2.2) and right side divergent segment (2.3), forms big, the middle little pipeline in two ends, the left and right sides; Left side converging transition (2.1) is connected with a wind passage (1), and right side divergent segment (2.3) is connected with pulverized coal combustor (6); Oil combustion chamber (4) is set on right side divergent segment (2.3).
3, a kind of heavy wool rifle circle of contact according to claim 2 is arranged micro-oil ignition coal powder combusting device, it is characterized in that: the extended line of central axis of described each oil combustion chamber (4.2) and central axis (4.2) is 6 °～12 ° with angle (β) between the normal of right side divergent segment (2.3) internal face intersection point, and the central axis of each oil combustion chamber (4.2) is tangential on the indoor imaginary circle (7) of coal dust firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101560195A CN100532936C (en) | 2007-10-09 | 2007-10-09 | Multiple oil gun rounding arrangement micro-oil ignition coal power combusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101560195A CN100532936C (en) | 2007-10-09 | 2007-10-09 | Multiple oil gun rounding arrangement micro-oil ignition coal power combusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101135446A CN101135446A (en) | 2008-03-05 |
| CN100532936C true CN100532936C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007101560195A Expired - Fee Related CN100532936C (en) | 2007-10-09 | 2007-10-09 | Multiple oil gun rounding arrangement micro-oil ignition coal power combusting device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454987B (en) * | 2010-11-01 | 2014-12-31 | 烟台龙源电力技术股份有限公司 | Pulverized coal burner and boiler with the same |
| CN106439914A (en) * | 2016-11-21 | 2017-02-22 | 深圳智慧能源技术有限公司 | Combustion chamber of combustion gas turbine |
| CN110529852B (en) * | 2019-09-23 | 2024-08-09 | 中国科学技术大学 | Micro-oil ignition combustion device |
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Granted publication date: 20090826 Termination date: 20101009 |