CN101135445A - Micro-oil ignition coal powder combusting device - Google Patents
Micro-oil ignition coal powder combusting device Download PDFInfo
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- CN101135445A CN101135445A CNA2007101560180A CN200710156018A CN101135445A CN 101135445 A CN101135445 A CN 101135445A CN A2007101560180 A CNA2007101560180 A CN A2007101560180A CN 200710156018 A CN200710156018 A CN 200710156018A CN 101135445 A CN101135445 A CN 101135445A
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- pulverized coal
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Abstract
This invention declares a tiny-oil ignition combustor of coal powder including successively connected primary air channel, coal powder concentrator and coal powder combustor with overlapping axis. At least 2 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 of 40degree-60degree with the primary air channel. The symmetrically position of double oil guns solves the heating problem of distal fuel with unilateral oil gun and saves the preheating time. This invention can accomplish the preheating and drying of the fuel and ignition in a much shorter distance, which eliminates the instability of ignition and low burnout rate of coal powder because of the inadequate length of coal powder combustor.
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 be that it relates to a kind of 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 the pulverized coal combustor of these burners generally all is circular spout, and all adopts the mode of single-sided arrangement oil gun.This class burner is owing to be the mode that has adopted the 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 micro-oil ignition coal powder combusting device that the purpose of this invention is to provide the ignition time that can shorten fuel greatly.
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.Be provided with 2 or 4 oil combustion chambers on pulverized coal concentrator symmetrically, 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 be connected successively left side converging transition, 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 area of the area≤port of export of the entrance point of described oil combustion chamber.
The entrance point cross section of described oil combustion chamber is circular, and the port of export cross section of oil combustion chamber is the oval type.
The beneficial effect that the present invention has is:
Owing to adopted 2 or 4 oil gun symmetric arrangement, when therefore having avoided the single-sided arrangement oil gun 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.
As depicted in figs. 1 and 2, the present invention includes pulverized coal concentrator 2, cross section is that a square wind passage 1 and cross section are square pulverized coal combustor 6.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 pipelines 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; Therefore the cross section of left side converging transition 2.1 and right side divergent segment 2.3 is square.The central axis 1.1 of a wind passage 1,
Central axis, the central axis of middle throat section 2.2, the central axis of right side divergent segment 2.3 and the central axis of pulverized coal combustor 6 of left side converging transition 2.1 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, and is provided with cooling air inlet 5.1 in the air compartment bottom; The top of cooling air compartment 5 is open and flushes with the outlet 6.1 of pulverized coal combustor 6, as cooling air outlet 5.2.
The present invention is provided with 2 oil combustion chambers 4 symmetrically on right side divergent segment 2.3; The port of export 4.3 that is each oil combustion chamber 4 is connected with right side divergent segment 2.3.When the cross section of right side divergent segment 2.3 was rectangle, oil combustion chamber 4 should be corresponding to rectangular long limit; Can make the nearer of 2 oil combustion chambers 4 so apart, reduce the torch penetration range.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.
The area of the area≤port of export 4.3 of the entrance point 4.1 of oil combustion chamber 4, for example the area of the port of export 4.3 is 1.5 times of area of entrance point 4.1.Entrance point 4.1 is designed to circle, and the port of export 4.3 is designed to the oval type, and the center line of this circular and oval type all coincides with the central axis 4.2 of oil combustion chamber 4; And circle is the oval type that carries out the transition to gradually sleekly.This structure can increase the contact area of oily flame and coal dust to greatest extent, to make full use of the heat heating coal dust of fuel oil flame.
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 top 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, will directly be washed into the both sides up and down of thick coal culm air-flow, form violent mass transfer, diabatic process, make the coal dust fire burns that heating up rapidly also from the oily flame of oil combustion chamber 4 ejection; Finally the outlet 6.1 from pulverized coal combustor 6 sprays.Therefore the layout because the two oil guns of employing liquidate arranges with traditional single oil gun and compares that coal dust is two-sided catching 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 two oil guns layout that liquidates, 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, can eliminate vortex district and dead area basically, avoid 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 (4)
1. micro-oil ignition coal powder combusting device comprises 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: be provided with 2 or 4 oil combustion chambers (4) on pulverized coal concentrator (2) symmetrically, 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 (11) of a wind passage (1).
2. a kind of micro-oil ignition coal powder combusting device according to claim 1, it is characterized in that: described pulverized coal concentrator (2) is made up of be connected successively left side converging transition (2.1), 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 micro-oil ignition coal powder combusting device according to claim 2 is characterized in that: the area of the area≤port of export (4.3) of the entrance point (4.1) of described oil combustion chamber (4).
4. a kind of micro-oil ignition coal powder combusting device according to claim 3 is characterized in that: the entrance point cross section (4.1) of described oil combustion chamber (4) is for circular, and the port of export cross section (4.3) of oil combustion chamber (4) is the oval type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101560180A CN101135445A (en) | 2007-10-09 | 2007-10-09 | Micro-oil ignition coal powder combusting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101560180A CN101135445A (en) | 2007-10-09 | 2007-10-09 | Micro-oil ignition coal powder combusting device |
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| CN101135445A true CN101135445A (en) | 2008-03-05 |
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| CNA2007101560180A Pending CN101135445A (en) | 2007-10-09 | 2007-10-09 | Micro-oil ignition coal powder combusting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010108386A1 (en) * | 2009-03-24 | 2010-09-30 | 烟台龙源电力技术股份有限公司 | Pulverized coal concentrating device and pulverized coal burner including same |
| CN101696800B (en) * | 2009-10-22 | 2011-01-19 | 中国计量学院 | Variable-section micro-oil combustion chamber |
| CN101696801B (en) * | 2009-10-22 | 2011-02-16 | 中国计量学院 | Little oil burner of double-sided ignition combination blunt body |
| CN104676586A (en) * | 2014-11-10 | 2015-06-03 | 中国神华能源股份有限公司 | Micro-gas ignition and combustion-supporting combustor and micro-gas ignition system |
| CN108413436A (en) * | 2018-03-30 | 2018-08-17 | 烟台龙源电力技术股份有限公司 | Pre-chamber arrangement and combustion system |
| CN116772199A (en) * | 2023-06-25 | 2023-09-19 | 北京天地融创科技股份有限公司 | Stable burner |
-
2007
- 2007-10-09 CN CNA2007101560180A patent/CN101135445A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010108386A1 (en) * | 2009-03-24 | 2010-09-30 | 烟台龙源电力技术股份有限公司 | Pulverized coal concentrating device and pulverized coal burner including same |
| CN101846315B (en) * | 2009-03-24 | 2012-07-04 | 烟台龙源电力技术股份有限公司 | Coal dust concentration device and coal dust burner with same |
| RU2490544C2 (en) * | 2009-03-24 | 2013-08-20 | Янтай Лунъюань Пауэр Текнолоджи Ко., Лтд. | Pulverised-coal concentrator, and pulverised-coal burner containing such concentrator |
| US8555795B2 (en) | 2009-03-24 | 2013-10-15 | Yantai Longyuan Power Technology Co., Ltd. | Pulverized coal concentrator and pulverized coal burner including the concentrator |
| CN101696800B (en) * | 2009-10-22 | 2011-01-19 | 中国计量学院 | Variable-section micro-oil combustion chamber |
| CN101696801B (en) * | 2009-10-22 | 2011-02-16 | 中国计量学院 | Little oil burner of double-sided ignition combination blunt body |
| CN104676586A (en) * | 2014-11-10 | 2015-06-03 | 中国神华能源股份有限公司 | Micro-gas ignition and combustion-supporting combustor and micro-gas ignition system |
| CN108413436A (en) * | 2018-03-30 | 2018-08-17 | 烟台龙源电力技术股份有限公司 | Pre-chamber arrangement and combustion system |
| CN116772199A (en) * | 2023-06-25 | 2023-09-19 | 北京天地融创科技股份有限公司 | Stable burner |
| CN116772199B (en) * | 2023-06-25 | 2024-04-05 | 北京天地融创科技股份有限公司 | Stable burner |
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