CN201526986U - Device and method for igniting pulverized coal by arc plasma - Google Patents
Device and method for igniting pulverized coal by arc plasma Download PDFInfo
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- CN201526986U CN201526986U CN2009201724842U CN200920172484U CN201526986U CN 201526986 U CN201526986 U CN 201526986U CN 2009201724842 U CN2009201724842 U CN 2009201724842U CN 200920172484 U CN200920172484 U CN 200920172484U CN 201526986 U CN201526986 U CN 201526986U
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Abstract
The utility model relates to a device and a method utilizing voltaic arcs for igniting pulverized coal. The device comprises a pair of anode-cathode transferred-arc plasma torches, a pulverized coal combustion barrel and blunt bodies. Air-pulverized coal mixture inflows from one end of the pulverized coal combustion barrel; nozzles of the anode-cathode transferred-arc plasma torches are positioned in the pulverized coal combustion barrel, and axial lines of the plasma torches extend outside the nozzles and then are crossed in the projective section of the pulverized coal combustion barrel; and the sides of the pair of plasma torches, into which the air-pulverized coal mixture flows, are respectively provided with one blunt body, on which breather holes or gaps are arranged. Plasma generated by the voltaic arc is positioned between the nozzles of the two plasma torches and an area formed by the leeside of the blunt body through enclosure and flows towards the outlet direction of the combustion barrel, the pulverized coal-air mixture is decelerated by the holes or the gaps on the blunt bodies or rounds the blunt bodies and then is sucked into a plasma high-temperature area, and the pulverized coal is fast heated and bursts in the plasma high-temperature area and then is separated from volatile matters, thereby being ignited; and a pulverized coal torch is formed at the outlet of the pulverized coal combustion barrel, thereby finishing the process of igniting the pulverized coal.
Description
Technical field
The utility model relates to device and the relevant ignition method that utilizes igniting coal powder by electric-arc plasma.
Background technology
Coal could smooth combustion at the certain high temperature environment.The large scale industry boiler all is to spray into coal dust after adopting oil or other inflammable raw materials to be heated to uniform temperature, forms smooth combustion.Existing large scale industry pulverized-coal fired boiler starting ignition and the combustion-supporting fuel of underload adopt light diesel fuel more.Because the combustion-supporting fuel consumption of the igniting of large scale industry pulverized-coal fired boiler and underload is big, under petroleum resources anxiety and the continuous soaring situation of oil price, study new coal powder point combustion technology and coal dust torch and replace oil fired torch, save a large amount of high price fuel oils, good economic benefits is arranged.
Hot plasma has concentration of energy, high temperature, high chemically active characteristics.Utilize hot plasma firing coal-dust fast, energy consumes low, and this respect has a lot of disclosure of the Invention.In the hot plasma generating technique,, thereby become a maximum technology of development and use because the arc-plasma power supply is simple, electric energy conversion efficiency is high.
In the existing device about arc heat plasma ignition coal dust, great majority are to utilize that arc plasma torch ejection plasma jet wake flame---hot-air heats and firing coal-dust.This respect has CN98202919.5, CN00231570.X, CN02203117.0 of people such as people's such as the U.S. Pat P4089628, Campbell Bu Laien of P.R.Blackburn people's such as CN88106045.3, Zhang Xinlu CN98233073.1 and Wang AiSheng etc.The common feature of disclosed coal powder point firearm is in the above-mentioned relevant patent: electric arc is positioned at the plasma torch cavity, and the plasma jet or the high-temperature gas of plasma torch ejection are lighted coal dust in the burner.For plasma being guided to suitable position, before people such as Tang Hong (ZL 01201021.9) have also designed a kind of plasma guiding tube and are added in the plasma torch nozzle, more reduced the plasma temperature that is used to light a fire.Studies show that, in the arc channel in the plasma torch body, its every plasma parameter, for example temperature, active particle density etc. are more much higher than plasma jet wake flame, that is to say, the temperature of plasma jet wake flame, active particle density have descended a lot, then must make the ability drop of its firing coal-dust, not only reduce the reliability of coal dust firing, also strengthen ignition energy consumption.
In people's such as Smirlock Martin E. people's such as USP4228747, Smith Doland A. USP4221174 and the disclosed coal powder point firearm of USP4241673, adopt the method for spark discharge to come firing coal-dust, the electric arc of its discharge can be to the coal dust area extension, ignition effectiveness is improved, but owing to adopt the pulsed discharge mode, influenced coal dust and lighted reliability and stability with coal dust firing.CN200610040409.1 discloses and a kind of coal dust has been injected the device and the ignition method of arc channel firing coal-dust, is a kind of burning method of coal powder point efficiently and device, but does not openly avoid the technology of wear to electrodes and anode coking.
Summary of the invention
The purpose of this utility model is, at deficiency of the prior art, provides a kind of and directly produces arc-plasma, the device that coal dust is lighted and burnt in coal dust-air mixture flows passage.
The purpose of this utility model is realized by following mode.
Coal powder point burning device of the present utility model, comprise coal dust firing tube in the coal dust prior art, bluff body, a negative electrode transferred-arc plasma torch and a pair of anode and cathode transferred-arc plasma torch that the anode transferred-arc plasma torch constitutes, it is characterized in that: the spout of described a pair of anode and cathode transferred-arc plasma torch is positioned at described coal dust firing tube projecting section, the outer axis of described a pair of anode and cathode transferred-arc plasma torch spout extends and intersects in the described coal dust firing tube projecting section, be 20 °-210 ° at coal air mixture incoming flow side angle between the outer axis of described a pair of anode and cathode transferred-arc plasma torch spout, the distance between the described a pair of transferred-arc plasma torch vents face center is 30～300mm.The flowing velocity that coal dust-air mixture enters described coal dust firing tube is a per second 15-30 rice, and the air quality of pc ratio of described coal dust-air mixture is 1: 0.1-1: 1.
Coal powder point burning device of the present utility model, wherein arc discharge passage two ends are positioned at the negative electrode of described a pair of anode and cathode utmost point transferred-arc plasma torch inner chamber and anode, middle two nozzle chambers and the outer space of spout through a pair of transferred-arc plasma torch, the zone of plasma between a pair of transferred-arc plasma torch nozzle that arc discharge produces, arc channel accounts for total arc length 5%-90% in the length of the plasma torch spout external space.
Flow to the influence of arc discharge stability for reducing coal dust-air mixture, be sidelong at coal dust-air mixture incoming flow at described a pair of anode and cathode transferred-arc plasma torch and put a bluff body, the coal dust air mixture is walked around entrainmented behind the bluff body to enter arc discharge area.At stewed body upper edge coal dust-air mixture flow direction perforate or seam, enter arc discharge area after making the coal dust air mixture sew deceleration by the bluff body hole.Described bluff body in the length on a pair of transferred-arc plasma torch spout center line connecting direction more than or equal to the distance between the described a pair of transferred-arc plasma torch spout, described bluff body in the length of the plane vertical direction that constitutes with a pair of transferred-arc plasma torch axis greater than 30mm, described bluff body downstream end face apart from the distance of plasma torch spout axis less than 200mm.The effect of bluff body is except reducing the influence of coal dust-air mixture article on plasma body stability, also improved the stability of coal dust firing, coal dust-air mixture sees through hole seam on the bluff body, and the restriction arc discharge area is apart from the distance of described bluff body, and the isolation arc discharge area is to the heat transfer of bluff body.
Coal powder point burning device of the present utility model, wherein the plasma Working medium gas adopts air.
The utility model utilizes the principle of above-mentioned coal powder point burning device firing coal-dust to be: the zone that the plasma that electric arc produces surrounds with the bluff body end face between two plasma torch spouts is also mobile to the combustion barrel Way out, mixes with the coal dust-air mixture that flows through; After placing bluff body, the coal dust-air mixture that flows into the import of coal dust firing tube is walked around from bluff body, is entrainmented to enter the plasma zone; For the bluff body that has the hole seam, coal dust-air mixture also sews to slow down by hole on the bluff body and enters the plasma zone; Coal dust is heated in the plasma zone, explosion and quick devolatilization, thereby is lighted, and goes out interruption-forming coal dust torch at the coal dust firing tube, finishes the coal dust ignition procedures.
The utility model is directly introduced arc discharge area with coal air mixture, plasma high-temperature in the discharge channel does not pass through any decay, directly heat coal air mixture, the not thermal losses in torch of plasma high-temperature in the discharge channel simultaneously, improved the utilization ratio and the thermal conversion efficiency of arc-plasma energy, coal powder point burning device ignition effectiveness has been improved greatly thereby improved.In addition, with respect to non-transferred arc plasma torch, the outer arc channel of plasma torch has improved arc voltage, plasma power can be improved on the one hand, the more coal dust of low-volatile or lighting of adaptation lower concentration coal dust can be lighted, on the other hand, under the identical situation of plasma power, can reduce arc current, thereby reduce export license, improve electrode life.
Be described further below by embodiment and accompanying drawing thereof.
Description of drawings
Fig. 1 is the structural profile schematic diagram vertical view of coal powder point burning device described in the utility model,
Fig. 2 is the side view of Fig. 1,
Fig. 3 is the vertical view of Fig. 1,
Fig. 4 is a pair of anode and cathode transferred-arc plasma torch structure described in the utility model and arc discharge access diagram.
The specific embodiment
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.
The 1st, the coal dust firing tube, the line of band arrow is wherein represented the streamline and the flow direction of coal air mixture.Combustion barrel is circle or rectangular duct, adopts wear-resisting, refractory metal to make.The 2nd, anode transferred-arc plasma torch, the 3rd, negative electrode transferred-arc plasma torch, two plasma torch symmetries are inserted from the combustion barrel both sides, two plasma torch axes intersect combustion barrel center lines, angle is 120 degree between the two plasma torch axis, and distance is 80mm between the two plasma torch spout centers.The 4th, bluff body is made for antifriction metal (AFM) or pottery, and bluff body is measure-alike at plasma spout line direction length dimension and combustion barrel insied width, is 80mm perpendicular to the height dimension of two plasma torch in-planes that axis constitutes.Open on bluff body and be parallel to combustion barrel axis hole, opening area is between two plasma torch spouts, and aperture F8, perforated area account for 40% of the opening area gross area.Bluff body can be protected the wearing and tearing of coal dust article on plasma body torch overcoat simultaneously.
21,22 is respectively the anode and the nozzle of anode transferred-arc plasma torch, and 31,32 is respectively the negative electrode and the nozzle of negative electrode transferred arc.Arc channel 5 one ends connect the anode 21 inner chamber walls of anode transferred-arc plasma torch 2, the other end connects the anode 31 inner chamber walls of negative electrode transferred-arc plasma torch 3, middle for through pipe AA sections and CA section, the outer OS section of a pair of transferred-arc plasma torch spout in anode transferred-arc plasma torch anode 21 inner chamber AI sections and negative electrode transferred-arc plasma torch negative electrode 31 inner chamber CI sections, the antianode transferred-arc plasma torch nozzle 22,32, wherein the electric arc section average length between a pair of transferred-arc plasma torch nozzle accounts for electric arc overall average length 60%.The plasma that electric arc produces and flows to coal dust firing tube Way out between a pair of transferred-arc plasma torch spout, forms plasma high-temperature zone 51.
The utility model utilizes the principle of above-mentioned coal powder point burning device firing coal-dust to be: at first start supply air system and blow to the coal dust firing tube; Between 31 pairs of nozzles 32 of negative electrode of 21 pairs of nozzles 22 of anode of anode transferred-arc plasma torch 2, negative electrode transferred-arc plasma torch 3, produce non-transferred arc by short circuit mode or high-voltage breakdown mode, be blown outside the plasma torch nozzle under the rotational flow gas effect of electric arc in the plasma torch chamber, UNICOM outside nozzle, simultaneously the arc root on nozzle extinguishes, and forms the arc discharge passage 5 from the negative electrode of cathode plasma torch to the anode of anode plasma torch; Electric arc 5 produces plasma between two plasma torch spouts, and flows to coal dust firing tube Way out, forms plasma high-temperature zone 51; After starting, arc plasma torch begins to the coal dust combustion barrel powder of delivering coal, coal dust-the air mixture that flows into the import of coal dust firing tube from bluff body walk around entrainmented enter the plasma zone or and enter the plasma zone by hole on the bluff body, coal dust is by plasma heating, explosion and quick devolatilization, coal dust is lighted, go out interruption-forming coal dust torch at the coal dust firing tube, finish the coal dust ignition procedures.Also can restart electric arc powder is delivered coal in startup to the coal dust combustion barrel after, be fired state at boiler normally, adopts when needs are combustion-supporting.
In the present embodiment, it is 20 meters of per seconds that coal dust and air mixture enter coal dust firing tube speed.Arc current is 200A, and the arc voltage between two plasma torch is 1000V.
Claims (3)
1. coal powder point burning device, comprise a negative electrode transferred-arc plasma torch and a pair of anode and cathode transferred-arc plasma torch that the anode transferred-arc plasma torch constitutes, the coal dust firing tube, wherein, coal dust-air mixture flows into from combustion barrel one end, it is characterized in that: the spout of described a pair of anode and cathode transferred-arc plasma torch is positioned at described coal dust firing tube projecting section, the outer axis of described a pair of anode and cathode transferred-arc plasma torch spout extends and intersects in the described coal dust firing tube projecting section, be 20 °-210 ° at coal air mixture incoming flow side angle between the outer axis of described a pair of anode and cathode transferred-arc plasma torch spout, the distance between the described a pair of transferred-arc plasma torch vents face center is 30～300mm.
2. coal powder point burning device as claimed in claim 1, wherein, the plane that described a pair of anode and cathode transferred-arc plasma torch axis constitutes is parallel with the coal air mixture flow direction, it is characterized in that, place a bluff body at described a pair of anode and cathode transferred-arc plasma torch in air-coal dust intermixture inflow side, described bluff body in the length of the plane vertical direction that constitutes with described a pair of anode and cathode transferred-arc plasma torch axis greater than 30mm, described bluff body downstream end face apart from the distance at plasma torch vents face center less than 200mm.
3. coal powder point burning device as claimed in claim 2 is characterized in that, at described bluff body upper edge air-coal dust intermixture flow direction perforate seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201724842U CN201526986U (en) | 2009-06-09 | 2009-06-09 | Device and method for igniting pulverized coal by arc plasma |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201724842U CN201526986U (en) | 2009-06-09 | 2009-06-09 | Device and method for igniting pulverized coal by arc plasma |
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| CN201526986U true CN201526986U (en) | 2010-07-14 |
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| CN2009201724842U Expired - Fee Related CN201526986U (en) | 2009-06-09 | 2009-06-09 | Device and method for igniting pulverized coal by arc plasma |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793060A (en) * | 2019-10-18 | 2020-02-14 | 燕山大学 | Controllable plasma igniter in atmospheric pressure environment |
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2009
- 2009-06-09 CN CN2009201724842U patent/CN201526986U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793060A (en) * | 2019-10-18 | 2020-02-14 | 燕山大学 | Controllable plasma igniter in atmospheric pressure environment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Yuan Jiatao Document name: Notification that Application Deemed not to be Proposed |
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| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: Dalian Lu, Baohe industrial district in Baohe District of Hefei city in Anhui province 230051 No. 9 new building 10 floor Anhui Dragon Electric Co Ltd Patentee after: Anhui Tenglong Electric Co., Ltd. Address before: 230088 room 609, Zhejiang building, No. 103 science Avenue, Anhui, Hefei Patentee before: Anhui Tenglong Electric Co., Ltd. |
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| C56 | Change in the name or address of the patentee |
Owner name: ANHUI XINNENG ELECTRICITY SCIENCE AND TECHNOLOGY C Free format text: FORMER NAME: ANHUI TENGLONG ELECTRIC CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: Dalian Lu, Baohe industrial district in Baohe District of Hefei city in Anhui province 230051 No. 9 new building 10 floor Patentee after: Anhuisheng Xinneng Electricity Science and Technology Co., Ltd. Address before: Dalian Lu, Baohe industrial district in Baohe District of Hefei city in Anhui province 230051 No. 9 new building 10 floor Anhui Dragon Electric Co Ltd Patentee before: Anhui Tenglong Electric Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100714 Termination date: 20140609 |