CN102200278B - Direct flow coal powder burner equipped with coal powder distributor - Google Patents
Direct flow coal powder burner equipped with coal powder distributor Download PDFInfo
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- CN102200278B CN102200278B CN2011101190457A CN201110119045A CN102200278B CN 102200278 B CN102200278 B CN 102200278B CN 2011101190457 A CN2011101190457 A CN 2011101190457A CN 201110119045 A CN201110119045 A CN 201110119045A CN 102200278 B CN102200278 B CN 102200278B
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Abstract
The invention provides a direct flow coal powder burner equipped with a coal powder distributor. The burner is composed of the direct flow coal powder burner and the coal powder distributor; the coal powder distributor is installed at the middle part region of a channel of the direct flow coal powder burner; two abrasion-proof high-temperature resisting alloy steels which constitute the coal powder distributor are respectively positioned at two sides of a central longitudinal axis of a base plate of the direct flow coal powder burner, are arrayed in a 'delta' shape symmetrically, and the small opening end of a 'delta' shape towards the outlet end of the direct flow coal powder burner. Dense-thin separation of the coal powder is realized through the coal powder distributor for the direct flow coal powder burner equipped with the coal powder distributor, and is good for the ignition burning of the coal powder, simultaneously the combustion efficiency of the boiler can be improved, and the generation of nitrogen oxide is reduced; and compared with the prior art, the burner provided by the invention has the advantages of simple structure and high industrial application, is easy to install, is especially good for the ignition stable burning of the coal powder, and is good for improving the burning efficiency of the coal powder and reducing the generation and emission of the nitrogen oxide.
Description
Technical field
The invention belongs to the coal-burning boiler field, be specifically related to straight-through pulverized coal burner, relate in particular to direct current slit coal burner.Be specially adapted to use the W type boiler of anthracite, meager coal, bituminous coal.
Technical background
At present, in the pulverized-coal fired boiler actual motion, coal dust gets into boiler combustion with a wind through burner; The coal powder density of a wind is lower than the best concentration of catching fire, and the low-volatile coal that especially catches fire for difficulty is in order to reduce ignition heat; Often, improve the method for a wind powder feeding concentration, but these means are limited by the coal dust transport requirement through reducing primary air ratio; Cross low wind speed and cause an airduct to block easily, thus in service usually, for guaranteeing the airduct security of operation one time; Have to improve wind wind rate one time, must bring the difficulty of catching fire like this.Utilize the pulverized coal bias combustion technology can solve this difficult problem.
Employing pulverized coal bias combustion technology; Still carry the coal dust of conventional concentration at an airduct; On airduct of burner outlet front end or burner, install distributor additional; Breeze airflow is divided into deep or light different two strands sprays into burner hearth, make coal powder density (especially dense side) reach favourable ignition condition, avoided stopping up the generation of airduct phenomenon simultaneously.After spraying into burner hearth, thick coal culm air-flow ignition temperature is low, and ignition heat is also lower; Therefore lighted earlier; The thick coal culm of having lighted then goes to light the thin powdered coal air-flow again, thereby has improved the low-load combustion-stabilizing ability of burning greatly, and deep or light air-flow all departs from the stoichiometric ratio burning; Realize fractional combustion, more help reducing the growing amount of nitrogen oxide.In a word, adopt the pulverized coal bias combustion technology, the local concentration that suitably improves breeze airflow can make breeze airflow more be prone to light and burn more stablely, reaches high-efficient low polluting combustion.
The key that adopts the pulverized coal bias combustion technology is the science of designing, effective, practical, easy coal dust distributor of installing; And carry out necessary structural adjustment according to different coal, the different boiler type of furnace, different combustion systems, finally realize the high-efficiency low-pollution discharging of coal powder boiler combustion.
Summary of the invention
Task of the present invention provides a kind of straight-through pulverized coal burner that pulverized coal distributor is housed, and it is had can realize that coal powder light-dark separates, and helps the steady combustion of catching fire of coal dust; Improve the efficiency of combustion of boiler; Reduce the generation of nitrogen oxide, improve efficiency of combustion, reduce characteristics such as slagging scorification.
Realize that technical scheme of the present invention is:
This straight-through pulverized coal burner that pulverized coal distributor is housed provided by the invention; Be in the straight-through pulverized coal burner passage, to be provided with pulverized coal distributor 3; Pulverized coal distributor 3 is made up of two blocks of steel alloys; The both sides of center longitudinal axis that two blocks of steel alloys that constitute pulverized coal distributor 3 lay respectively at the base plate 1 of straight-through pulverized coal burner are " eight " font symmetric arrays; The osculum end of its " eight " font is towards the discharge end 4 of straight-through pulverized coal burner, and the bottom that constitutes two blocks of steel alloys of pulverized coal distributor 3 is connected with top board 2 with the base plate 1 of straight-through pulverized coal burner respectively with the top.
Two blocks of steel alloys of above-described formation pulverized coal distributor 3 are the Wear-resistant, high-temperature resistant steel alloy, specifically can be the stainless steels of Wear-resistant, high-temperature resistant, also can be the steel alloys that contains the Wear-resistant, high-temperature resistant of the high titanium of high chrome high-nickel; Described pulverized coal distributor 3 is arranged on the central region of straight-through pulverized coal burner passage; Constitute pulverized coal distributor 3 two blocks of steel alloys vertical axis, bottom respectively and the angle β between the center longitudinal axis of the base plate 1 of straight-through pulverized coal burner between 10 degree to 80 degree; Two blocks of steel alloys that constitute pulverized coal distributor 3 can be lineal hexahedral shape.The central point that constitutes each piece in two blocks of steel alloys of pulverized coal distributor 3 is 1/4～3/4 of a straight-through pulverized coal burner length apart from the distance on the port plane of the coal burner port of export 4,1/4～3/4 of the straight-through pulverized coal burner channel cross-section width that the distance between the central point that constitutes a steel alloy in two blocks of steel alloys of pulverized coal distributor 3 and the central point of another piece steel alloy belongs to for its central point.The central point that constitutes each piece in two blocks of steel alloys of pulverized coal distributor 3 can be 2/5 of straight-through pulverized coal burner length apart from the distance on the port plane of the coal burner port of export 4,1/3 of the straight-through pulverized coal burner channel cross-section width that the distance between the central point that constitutes a steel alloy in two blocks of steel alloys of pulverized coal distributor 3 and the central point of another piece steel alloy can belong to for heart point wherein.
Described pulverized coal distributor material is the Wear-resistant, high-temperature resistant steel alloy, can adopt to be welded in the burner or to merge casting with burner and accomplish, can be high temperature resistant, and wear-resistant, long service life.
The present invention is when using, and coal dust is divided into deep or light different two strand by pulverized coal distributor with wind and sprays into burner hearth in coal burner.After spraying into burner hearth, thick coal culm air-flow ignition temperature is low, and ignition heat is also lower, is therefore lighted earlier, and the thick coal culm of having lighted then goes to light the thin powdered coal air-flow again, thereby has improved the low-load combustion-stabilizing ability of burning greatly.Deep or light air-flow all departs from the stoichiometric ratio burning simultaneously, helps reducing total nitrogen oxide emission.Be specially adapted to use the W type boiler of anthracite, meager coal, bituminous coal.
The present invention has following advantage compared with prior art:
(1) simple in structure, be convenient to processing, install easily, be beneficial in the burners in prior transformation, it is convenient to implement;
(2) realize that coal powder light-dark is separated, make catching fire easily and smooth combustion of coal dust, reduce combustion process NOx and generate;
(3) stable ignition, efficient burning, the low NOx drainage target of realization colm;
(4) less resistance characteristic.
Industrial applicability of the present invention is strong, and is simple in structure, installs easily, helps in the burners in prior transformation, and it is convenient to implement.Be beneficial to the steady combustion of catching fire of coal dust especially, possess the coal dust firing of raising efficient simultaneously, the reduction nitrogen oxide generates the characteristics with discharging.
Description of drawings
Fig. 1 is the straight-through pulverized coal burner structural representation that pulverized coal distributor is housed.
Fig. 2 is the horizontal sectional drawing of Fig. 1.
Fig. 3 is the horizontal sectional drawing of Fig. 1 of β for the angle between the center longitudinal axis of the base plate 1 of vertical axis, the bottom that identifies each piece in two blocks of steel alloys that formation pulverized coal distributor 3 is arranged and straight-through pulverized coal burner.
Fig. 4 is the structural representation of one embodiment of the invention.
Fig. 5 is the horizontal sectional drawing that indicates Fig. 1 of deep or light airflow direction.
Fig. 6 is equipped with the straight-through pulverized coal burner test-bed of pulverized coal distributor for horizontal single angle stove.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further
A kind of straight-through pulverized coal burner that pulverized coal distributor is housed as shown in Figure 4, the length L of its straight-through pulverized coal burner is 800mm, and height H is 170mm, and the import cross section gets width W
1Be 140mm, the width W of outlet 4
2Be 240mm, be provided with pulverized coal distributor 3 in the passage of straight-through pulverized coal burner, pulverized coal distributor 3 is made up of two blocks of Wear-resistant, high-temperature resistant steel alloys, and steel alloy is a lineal hexahedral, and its length is 80mm, and width is 16mm, highly equals the height H of straight-through pulverized coal burner.Two blocks of steel alloys that constitute pulverized coal distributor 3 lay respectively at the both sides of the center longitudinal axis of straight-through pulverized coal burner base plate 1; Be " eight " font symmetric arrays; The osculum end of its " eight " font is towards the port of export 4 of straight-through pulverized coal burner; The central point of each piece in two blocks of steel alloys of formation pulverized coal distributor 3 is 2/5 of the long L of straight-through pulverized coal burner apart from the distance on the port plane of the coal burner port of export 4; 1/3 of the straight-through pulverized coal burner channel cross-section width that distance between the central point that constitutes a steel alloy in two blocks of steel alloys of pulverized coal distributor 3 and the central point of another piece steel alloy belongs to for its central point; Angle between the center longitudinal axis of the base plate 1 of vertical axis, the bottom of each piece in two blocks of steel alloys of formation pulverized coal distributor 3 and straight-through pulverized coal burner is β, and this instance inclination angle beta is 30 °.
When coal dust is transported to pulverized coal distributor 3; Because what pulverized coal distributor 3 formed is the port of export 4 of the osculum end of " eight " font and " eight " font towards straight-through pulverized coal burner; Under the effect of " eight " font pulverized coal distributor, most of coal dust will be realized the deep or light separation of coal dust toward intermediate flow.
When using, see Fig. 5, coal dust gets into coal burner with a wind, under the effect of pulverized coal distributor 3; Form deep or light air-flow, in Fig. 5, I is the thin powdered coal air-flow; II is the thick coal culm air-flow, and thick coal culm air-flow II ignition temperature is low, and ignition heat is also lower; Therefore lighted earlier, the thick coal culm of having lighted then removes to light thin powdered coal air-flow I again, thereby helps catching fire and the low-load combustion-stabilizing ability that has improved burning greatly.When practical application; Thereby can make light side I make the water-cooling wall near zone form the oxidizing atmosphere zone near the water-cooling wall near zone; Improved grey melt temperature; And stoped the combusting coal fines particle directly to wash away water-cooling wall, thus having improved slagging prevention capacity, simultaneous oxidation property atmosphere helps preventing high temperature corrosion.
The straight-through pulverized coal burner that pulverized coal distributor is housed with embodiment 1 experimentizes.
The straight-through pulverized coal burner that pulverized coal distributor is housed is installed on the combusting coal fines stove of the single angle of 100kW makes an experiment.Test-bed is shown in accompanying drawing 6, and it is made up of blower fan 5, coal feeder 6, coal burner 8, secondary air duct 7, horizontal single angle stove 9 and detection mouth 10.Burner is used grease gun igniting earlier during startup, and flameholding is retreated out oil gun, measures afterbody NOx concentration of emission this moment.Coal dust is undertaken to powder by coal feeder; The coal feeder powder-feeding amount is 25kg/h, and the coal dust that falls is carried by the hot blast from following pipeline, and coal dust mixes the tangential, back with a wind and gets into burner; Under the effect of pulverized coal distributor, form deep or light two strands of air-flows and get into the burner hearth burning.
1. experiment coal: colm below is the Industrial Analysis and the elementary analysis (air-dried basis) of coal:
2. experiment condition: it is 25kg/h that experiment keeps the coal dust powder-feeding amount; Straight-through pulverized coal burner after adopting the straight-through pulverized coal burner that pulverized coal distributor is not installed respectively and pulverized coal distributor being installed carries out combustion experiment; Measure the NOx concentration of emission in last hole of burner hearth, single angle (being the furnace outlet place) Deng the stable back of coal dust firing, thereby draw actual reduced value.
3. experimental result:
The result of straight-through pulverized coal burner with the straight-through pulverized coal burner that pulverized coal distributor is installed of pulverized coal distributor is not housed.
Experimental calculation: denitration efficiency
Can find out from experimental result; The straight-through pulverized coal burner of pulverized coal distributor is installed to be compared with the straight-through pulverized coal burner that pulverized coal distributor is not installed; The burner hearth mean temperature increases; The coal dust unburned carbon in flue dust reduces, and shows that flammability and the combustion stability of transforming back fuel are improved, and have also improved fuel economy simultaneously.Fire box temperature T＜1500 ℃ in the experiment mainly are fuel type NOx.Denitration efficiency had reached 25.77% after the straight-through pulverized coal burner of pulverized coal distributor was installed, and the result shows that the straight-through pulverized coal burner that pulverized coal distributor is installed has reached and improves the purpose that fuel fire is surely fired performance and reduction NOx simultaneously.
Can find out that from above-mentioned the present invention can promote coal dust smooth combustion effectively, reduce the discharging of NOx, improve efficiency of combustion and reduce slagging scorification.
Claims (9)
1. straight-through pulverized coal burner that pulverized coal distributor is housed; It is characterized in that; In the straight-through pulverized coal burner passage, be provided with pulverized coal distributor (3); Pulverized coal distributor (3) is made up of two blocks of steel alloys; The both sides of center longitudinal axis that two blocks of steel alloys that constitute pulverized coal distributor (3) lay respectively at the base plate (1) of straight-through pulverized coal burner are " eight " font symmetric arrays, and the osculum end of its " eight " font is towards the discharge end (4) of straight-through pulverized coal burner, and the bottom that constitutes two blocks of steel alloys of pulverized coal distributor (3) is connected with top board (2) with the base plate (1) of straight-through pulverized coal burner respectively with the top.
2. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 1 is characterized in that, two blocks of steel alloys that constitute pulverized coal distributor (3) are the Wear-resistant, high-temperature resistant steel alloy.
3. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 2 is characterized in that, described Wear-resistant, high-temperature resistant steel alloy is the stainless steel of Wear-resistant, high-temperature resistant or the Wear-resistant, high-temperature resistant steel alloy that contains the high titanium of high chrome high-nickel.
4. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 1 is characterized in that, pulverized coal distributor (3) is arranged on the central region of straight-through pulverized coal burner passage.
5. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 1; It is characterized in that, constitute pulverized coal distributor (3) two blocks of steel alloys vertical axis, bottom respectively and the angle β between the center longitudinal axis of the base plate of straight-through pulverized coal burner (1) between 10 degree to 80 degree.
6. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 1 is characterized in that, two blocks of steel alloys that constitute pulverized coal distributor (3) are lineal hexahedral shape.
7. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 1; It is characterized in that; The central point of each piece in two blocks of steel alloys of formation pulverized coal distributor (3) is 1/4～3/4 of a straight-through pulverized coal burner length apart from the distance on the port plane of the coal burner port of export (4), and the distance in two blocks of steel alloys of formation pulverized coal distributor (3) between the central point of the central point of a steel alloy and another piece steel alloy is: 1/4～3/4 of the straight-through pulverized coal burner channel cross-section width at the central point place of each piece in two blocks of steel alloys of formation pulverized coal distributor (3).
8. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 7; It is characterized in that; The central point of each piece in two blocks of steel alloys of formation pulverized coal distributor (3) is 2/5 of a straight-through pulverized coal burner length apart from the distance on the port plane of the coal burner port of export (4), and the distance in two blocks of steel alloys of formation pulverized coal distributor (3) between the central point of the central point of a steel alloy and another piece steel alloy is: 1/3 of the straight-through pulverized coal burner channel cross-section width at the central point place of each piece in two blocks of steel alloys of formation pulverized coal distributor (3).
9. the straight-through pulverized coal burner that pulverized coal distributor is housed according to claim 5; It is characterized in that, constitute pulverized coal distributor (3) two blocks of steel alloys vertical axis, bottom respectively and the angle β between the center longitudinal axis of the base plate of straight-through pulverized coal burner (1) be 30 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101190457A CN102200278B (en) | 2011-05-10 | 2011-05-10 | Direct flow coal powder burner equipped with coal powder distributor |
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| CN2011101190457A CN102200278B (en) | 2011-05-10 | 2011-05-10 | Direct flow coal powder burner equipped with coal powder distributor |
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| CN102200278A CN102200278A (en) | 2011-09-28 |
| CN102200278B true CN102200278B (en) | 2012-05-09 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251665Y (en) * | 1995-08-02 | 1997-04-09 | 李春甫 | Coal powder burner for boiler |
| CN1155052A (en) * | 1996-11-18 | 1997-07-23 | 浙江大学 | Wide-regulatior-ratio multiple-coal-kind thick-thin-phase coal powder cyclone burner |
| US5818899A (en) * | 1997-04-02 | 1998-10-06 | Mcdermott Technology, Inc. | X-ray fluorescence analysis of pulverized coal |
| CN2293718Y (en) * | 1997-03-12 | 1998-10-07 | 浙江大学 | Large range variable loading concentrated & dilute phase pulverized coal combustor |
| CN2587513Y (en) * | 2002-11-06 | 2003-11-26 | 华东电力试验研究院 | Centrifuga adjustable coal dust distributor |
| CN101290119A (en) * | 2008-06-04 | 2008-10-22 | 杭州意能节能技术有限公司 | Low NOx cyclone micro-oil coal powder burner |
| WO2010026929A1 (en) * | 2008-09-08 | 2010-03-11 | 三菱重工業株式会社 | Gasification furnace apparatus |
-
2011
- 2011-05-10 CN CN2011101190457A patent/CN102200278B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251665Y (en) * | 1995-08-02 | 1997-04-09 | 李春甫 | Coal powder burner for boiler |
| CN1155052A (en) * | 1996-11-18 | 1997-07-23 | 浙江大学 | Wide-regulatior-ratio multiple-coal-kind thick-thin-phase coal powder cyclone burner |
| CN2293718Y (en) * | 1997-03-12 | 1998-10-07 | 浙江大学 | Large range variable loading concentrated & dilute phase pulverized coal combustor |
| US5818899A (en) * | 1997-04-02 | 1998-10-06 | Mcdermott Technology, Inc. | X-ray fluorescence analysis of pulverized coal |
| CN2587513Y (en) * | 2002-11-06 | 2003-11-26 | 华东电力试验研究院 | Centrifuga adjustable coal dust distributor |
| CN101290119A (en) * | 2008-06-04 | 2008-10-22 | 杭州意能节能技术有限公司 | Low NOx cyclone micro-oil coal powder burner |
| WO2010026929A1 (en) * | 2008-09-08 | 2010-03-11 | 三菱重工業株式会社 | Gasification furnace apparatus |
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