CN104237452A - Continuous combustion device for solid powder - Google Patents
Continuous combustion device for solid powder Download PDFInfo
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- CN104237452A CN104237452A CN201410543414.9A CN201410543414A CN104237452A CN 104237452 A CN104237452 A CN 104237452A CN 201410543414 A CN201410543414 A CN 201410543414A CN 104237452 A CN104237452 A CN 104237452A
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Abstract
The invention discloses a continuous combustion device for solid powder, for overcoming the problems of low safety and controllable degree, in the existing device. The continuous combustion device for solid powder comprises a powder bin, a combustion system, a power system and a carrier gas transmission system. The working process of the continuous combustion device for solid powder disclosed by the invention is described as follows: pyrogenic powder in the powder bin is conveyed in an injector by a precession screw, a carrier gas is conveyed in a premixing bin through a transmission pipeline, and uniformly ejected in the form of an array through a spray tube, at this moment, an auxiliary gas system works, dust cloud ejected by a spray tube is mixed with an auxiliary gas, and ignited by an ignition furnace wire to continuously combust; a switch in each step is controlled by an automatic control system. With the adoption of the device disclosed by the invention, safe and controllable combustion of the solid powder is promoted.
Description
Technical field
The present invention relates to a kind of device of pressed powder continuous burning.
Background technology
Along with the development of modern industry and the progress of powder technology, in commercial production, transport and operating process, all inevitably produce dust.These dust are as often inflammable and explosive in mineral powders such as the metal powder such as iron, aluminium, coals, this generates the security protection problem of combustible powder.Be familiar with the burning of various combustible dust and blast characteristics, study its law of flame and have important theory and realistic meaning for the safety in production of powder and safe handling.Except producing high temperature, theory in recent years and experimental result show that the burning of solid also can produce plasma, and have stronger absorption (light laser and the particle beams 2005,17,707) to the microwave of 2-15 GHz.On the other hand, along with the development and progress of inorganic particle technology of preparing, people attempt utilizing powder to burn a large amount of reaction heat produced, the synthesis of the superfine ceramic powders such as oxide is used for by solid phase double decomposition, self-propagating reaction, but this self-propagating means interval, in continuous seepage, there are certain difficulty (Hu Yanjie etc., Chinese material is in progress, 2012,33,44).If pressed powder can realize continuous burning by equipment, produce positive effect by following three: (1) is familiar with fired state and the flame characteristic of different solid dust further on existing basis, producing for the dust of correspondence, transport and use provides theoretical and scientific basis; (2) produce the physical characteristics such as plasma for particular solid dust-firing, study its screening behavior to electromagnetic signal, in military and civilian, have potential using value.(3) the continuous burning equipment of pressed powder, is conducive to continuous synthesis and the production of the stupalith such as oxide, nitride, provides new means and selection, reduce its energy consumption and cost.
In order to realize the continuous burning of pressed powder, coal gasification adopts single spraying pipe, and jet size used is large, processing power strong, but pulverized coal particle is large, and be unsuitable for superfine powder, caliber is unfavorable for greatly datonation-inhibition; Forefathers also adopt the device of similar Bunsen burner to carry out laboratory scale powder flame combustion performance study (Combustion and Flame, 1996,105,147; Combustion and Flame, 2003,133,275), but still there is too large, the easy tempering of (1) caliber; (2) nozzle exit is single tube, flame profile and area single, be difficult to further investigate powder burning feature.Wang Qiu is red on the basis of the above waits people to disclose a kind of open system winding-up premixed combustion pilot system (Chinese patent, CN102323374A), this system adopts air to carry combustible powder as carrier gas, through twice mixing such as pre-mixing cabin, enter datonation-inhibition jet arrays, the continuous burning of open space powder flame is realized through flame gun igniting, but the portfire of this system is simple and crude, operating personnel and flame are apart from too near, air directly mixes with combustible powder, combustible powder is with air high-speed transfer in the duct, collision meeting combustion explosion in the duct, cause the hazard level of this system excessive.In this external practical operation, the negative pressure that thrower is formed can cause powder amount and control the frequency of motor can not be directly related, and controllable degree is poor, the powder very easily tempering of excessive concentration.
Summary of the invention
For the problems that existing equipment exists, the invention provides the pressed powder continuous combustion apparatus that a kind of safety is controlled.
The course of work of the present invention can be sketched and be: the pyrogenicity powder in powder storehouse brings thrower into by precession screw rod, pre-mixing cabin is brought into through transmission pipeline by carrier gas, evenly spray through jet arrays, now assisted gas system works, the dust clouds of jet pipe ejection mixes with assisted gas, lighted by ignition stove wire, final formation thermal-flame region.By the switch of each step of automatic controlling system.
Pressed powder continuous combustion apparatus of the present invention, comprise powder storehouse, combustion system, power system, carrier gas transfer system, is characterized in that described power system is by frequency converter, motor, reductor and precession screw rod composition, by inverter control motor and reductor, and then control the rotating speed of precession screw rod, described carrier gas transfer system is made up of carrier gas source, surge tank and solenoid valve, solenoid control carrier gas flux, upper and lower two parts are divided in described powder storehouse, lower part is equipped with precession screw rod, upper part controls dividing plate and is divided into storage area, buffer zone and control zone, there is charging aperture on the top of storage area, have discharging opening bottom control zone, the height controlling dividing plate between storage area and buffer zone is less than the height controlling dividing plate, described combustion system comprises thrower, pipeline, pre-mixing cabin, combustion bin, the carrier gas inlet of thrower is connected with solenoid valve, the powder import of thrower is connected with discharging opening, thrower is connected with pre-mixing cabin bottom by pipeline, and pre-mixing cabin is turbination, pre-mixing cabin top is connected with bottom combustion bin, combustion bin is made up of coaxial urceolus and inner core, assisted gas air intake opening is arranged at its urceolus bottom, the top and bottom of inner core is tube sheet, jet arrays is arranged in inner core, be powder passage in jet pipe, assisted gas opening is arranged at the top between urceolus and inner core, ignition stove wire is had above combustion bin.
Also have spherical protective cover on combustion bin top, there is chimney on its top, has products export bottom spherical protective cover.
Combustion bin cylinder as above only has urceolus, and assisted gas air intake opening is arranged at urceolus bottom, and the top and bottom of urceolus is tube sheet, and jet arrays is arranged in urceolus, is powder passage, has assisted gas opening between the jet pipe of urceolus head tube plate in jet pipe.
The diameter of transmission pipeline as above between 2 points ~ 1.5 inch, crooked radian between 0.2 ~ 1.5, bending radius 2 ~ 0.3 m; Pipeline joining place is smooth circular arc.
Mixing bunker as above is inverted cone-shaped, and its ratio of height to diameter is between 1.0 ~ 4.0.
Ignition stove wire power as above, between 0.1 ~ 0.5 Kw, forms 3 ~ 6 limit shapes in jet arrays outer rim.Resistance wire is fixed on 0.5 ~ 15 cm above burning pallet by insulating ceramics pipe, and its constant ignition temperature is 300 ~ 700
obetween C.By Control ignition stove wire, adopt the air switch protection of 2 ~ 8 A.
The present invention compared with prior art tool has the following advantages:
1. carrier gas and assisted gas separate by this equipment, improve the security of burner;
2. this equipment is controlled the igniting of equipment, flow process of burning by robotization, replaces artificial use flame gun sparking mode, improve safety and reliability with electric ignition;
3. by design to equipment powder storehouse, enable pressed powder relatively uniform, controllably enter burner, avoid and use precession screw rod to the problem of the controlling extent difference of powder flow.
Accompanying drawing explanation
Fig. 1 is powder body mixing arrangement schematic diagram of the present invention.
Fig. 2 is the side view of another structure of combustion bin.
Fig. 3 uses N
2as carrier gas, Fe
2o
3: Zr composite granule burns representative picture.
As shown in the figure, 1 is frequency converter, 2 is motor, 3 is reductors, 4 is precession screw rods, 5 is powder storehouses, 6 is control dividing plate, 7 is surge tanks, 8 is solenoid valves, 9 is throwers, 10 is pipelines, 11 is pre-mixing cabin, 12 is jet arrays, 13 is assisted gas air intake openings, 14 is combustion bins, 15 is assisted gas outlets, 16 is ignition stove wires, 18 is spherical protective covers, 19 is chimneys, 20 is products exports, 24 is charging apertures, 25 is discharging openings, 51 is storage areas, 52 is buffer zones, 53 is control zones, 61 is control dividing plate, 71 is carrier gas source, 141 is urceolus, 142 is inner cores.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail, wherein in all views, similar label represents similar original paper.
Embodiment 1
Pressed powder continuous combustion apparatus of the present invention, comprise powder storehouse 5, combustion system, power system, carrier gas transfer system, described power system is by frequency converter 1, motor 2, reductor 3 and precession screw rod 4 form, and control motor 2 and reductor 3 by frequency converter 1, and then control the rotating speed of precession screw rod, described carrier gas transfer system is made up of carrier gas source 71, surge tank 7 and solenoid valve 8, and solenoid valve 8 controls carrier gas flux, about 5 points, described powder storehouse two parts, lower part is equipped with precession screw rod 4, upper part controls dividing plate 6 and 61 and is divided into storage area 51, buffer zone 52 and control zone 53, there is charging aperture 54 on the top of storage area 51, have discharging opening 25 bottom control zone 53, the height controlling dividing plate 61 between storage area 51 and buffer zone 52 is less than the height controlling dividing plate 6, described combustion system comprises thrower 9, pipeline 10, pre-mixing cabin 11, combustion bin (14), the carrier gas inlet of thrower 9 is connected with solenoid valve 8, the powder import of thrower 9 is connected with discharging opening 25, thrower 9 is connected with pre-mixing cabin 11 bottom by pipeline 10, and pre-mixing cabin 11 is turbinations, pre-mixing cabin 11 top is connected with bottom combustion bin, combustion bin 14 is made up of coaxial urceolus 141 and inner core 142, assisted gas air intake opening 13 is arranged at its urceolus 141 bottom, the top and bottom of inner core 142 is tube sheet, jet arrays 12 is arranged in inner core 142, be powder passage in jet pipe, assisted gas opening 15 is arranged at the top between urceolus 141 and inner core 142, ignition stove wire 16 is had above combustion bin 14.
Wherein diameter 4 points of inch of pipeline 10, crooked radian is 0.2, bending radius 2m; Pipeline joining place is smooth circular arc.Mixing bunker 11 ratio of height to diameter 1.0.Ignition stove wire 16 power 0.1KW, form quadrilateral in jet arrays outer rim, ignition stove wire 16 is fixed on 0.5cm above combustion bin 14 by insulating ceramics pipe.By Control ignition stove wire, the air switch of 2 A is adopted to protect.
Control system adopts sequential control, guarantee that burning is normal, its switching sequence is: open frequency converter 1, drive motor 2, drive reductor 3, drive precession screw rod 4 to bring powder in system, open carrier gas solenoid valve 8 subsequently, bring powder into burner through thrower 9 and pipeline 10, now open that assisted gas air feed, now assisted gas work with ignition stove wire 16 subsequently, end to be combusted, close powder feed system, close assisted gas and carrier gas system.Wherein carrier gas system, powder feed system, ignition stove wire can control separately, to close in time if desired.
In powder storehouse 5, powder enters control zone 53 by storage area 51 through buffer zone 52, regulates powder height by control baffle plate 61, and the powder entering control zone 53 brings transmission pipeline 10 into by thrower 9, and the height controlling baffle plate 6 determines powder and enters powder amount.Pipeline 10 joining place is smooth circular arc, and above-mentioned radian and radius requirement are in order to avoid the inflammable powder of part and pipeline right angle and joining place burr collide, and cause the collision in transmission to burn, cause tempering.Carrier gas transfer system is by dispersed for efficient pyrogenicity powder, and being formed can the dust cloud of sustained combustion,
System carrier gas experimentally demand can select N
2, Ar mixed gas.These gases directly can not react with combustible powder, produce heat, shield in the transmission to powder.Carrier gas brings powder into from thrower 9, is delivered to pre-mixing cabin 11 through pipeline 10.The powder mixed is sprayed by jet arrays 12, and the assist gas sprayed with 15 mixes.
Assisted gas is air, and object is to provide enough oxygen contents to continuous flammable dust clouds, and mixed flammable dust clouds is through firing system successful ignition, and adopt resistance wire or the igniting of effluve sparking mode, resistance wire, shape, its constant ignition temperature is 300 ~ 700
obetween C.For avoiding resistance wire resistance decreasing under high-temperature condition, electric current is excessive, and control end is by Control firing circuit.
200 grams of Zr:Fe are added in powder storehouse
2o
3composite granule, adopts N
2as carrier gas, air is as assisted gas.Carry out the continuous burning characteristic studying solid dust clouds flame, Fig. 3 is combustion flame image, and in figure, white represents flame.
Embodiment 2
As described in Example 1, for burning prepares powder body material, the powder using spherical protective cover 18 and chimney 19 that burning is produced is collected by products export 20, final acquisition ferrozirconium composite oxide material.
Embodiment 3
Diameter 2 points of inch of transmission pipeline 10, crooked radian is 0.4, bending radius 0.8m; Pipeline joining place is smooth circular arc.Mixing bunker 11 ratio of height to diameter 2.0.Ignition stove wire 16 power 0.2Kw, forms 3 limit shapes in jet arrays outer rim, and ignition stove wire 16 is fixed on 3 cm above combustion bin 14 by insulating ceramics pipe.By Control ignition stove wire, adopt the air switch protection of 4A.All the other are with embodiment 1.
Embodiment 4
Diameter 1.2 inch of transmission pipeline 10, crooked radian is 0.6, bending radius 0.6; Pipeline joining place is smooth circular arc.Mixing bunker 11 ratio of height to diameter is between 3.0.Ignition stove wire 16 power is between 0.3 Kw, and form pentagon in jet arrays outer rim, ignition stove wire 16 is fixed on 8 cm above combustion bin 14 by insulating ceramics pipe.By Control ignition stove wire, adopt the air switch protection of 4A.All the other are with embodiment 1.
Embodiment 5
Combustion bin 14 cylinder only has urceolus 141, assisted gas air intake opening 13 is arranged at urceolus 141 bottom, and the top and bottom of urceolus 141 is tube sheet, and jet arrays 12 is arranged in urceolus 141, be powder passage in jet pipe, between the jet pipe of urceolus 141 top tube sheet, have assisted gas opening 15(to see Fig. 2).
The diameter of transmission pipeline 10 is between 1.5 points of inch, and crooked radian is 1.5, bending radius 0.3; Pipeline joining place is smooth circular arc.Mixing bunker 11 ratio of height to diameter is 4.Ignition stove wire 16 power 0.5Kw, form hexagon in jet arrays outer rim, ignition stove wire 16 is fixed on 15 cm above combustion bin 14 by insulating ceramics pipe.By Control ignition stove wire, adopt the air switch protection of 8A.All the other are with embodiment 1.
Claims (6)
1. a pressed powder continuous combustion apparatus, it comprises powder storehouse (5), combustion system, power system, carrier gas transfer system, is characterized in that described power system is by frequency converter (10, motor (2), reductor (3) and precession screw rod (4) composition, control motor (2) and reductor (3) by frequency converter (1), and then control the rotating speed of precession screw rod (4), described carrier gas transfer system is made up of carrier gas source (71), surge tank (7) and solenoid valve (8), and solenoid valve (8) controls carrier gas flux, described powder storehouse (5) point upper and lower two parts, lower part is equipped with precession screw rod (4), upper part controls dividing plate (6) and (610 are divided into storage area (51), buffer zone (52) and control zone (53), there is charging aperture (54) on the top of storage area (51), discharging opening (25) is arranged at bottom, control zone (53), and the height controlling dividing plate (61) between storage area (51) and buffer zone (52) is less than the height controlling dividing plate (6), described combustion system comprises thrower (9), pipeline (10), pre-mixing cabin (11), combustion bin (14), the carrier gas inlet of thrower (9) is connected with solenoid valve (8), the powder import of thrower (9) is connected with discharging opening (25), thrower (9) is connected with pre-mixing cabin (11) bottom by pipeline (10), pre-mixing cabin (11) is turbination, pre-mixing cabin (11) top is connected with combustion bin (14) bottom, combustion bin (14) is made up of coaxial urceolus (141) and inner core (142), assisted gas air intake opening (13) is arranged at its urceolus (14) bottom, the top and bottom of inner core (142) is tube sheet, jet arrays (12) is arranged in inner core (142), be powder passage in jet pipe, assisted gas opening (15) is arranged at the top between urceolus (141) and inner core (142), ignition stove wire (16) is had in combustion bin (14) top.
2. a kind of pressed powder continuous combustion apparatus as claimed in claim 1, it is characterized in that described combustion bin (14) only has urceolus (141), assisted gas air intake opening (13) is arranged at urceolus (141) bottom, the top and bottom of urceolus (141) is tube sheet, jet arrays (12) is arranged in urceolus (141), be powder passage in jet pipe, between the jet pipe of urceolus (141) top tube sheet, have assisted gas opening (15).
3. a kind of pressed powder continuous combustion apparatus as claimed in claim 1 or 2, it is characterized in that described combustion bin (14) top also has spherical protective cover (18), there is chimney (19) on its top, and products export (20) is arranged at spherical protective cover (18) bottom.
4. a kind of pressed powder continuous combustion apparatus as claimed in claim 1, is characterized in that the diameter of described pipeline (10) is between 2 points ~ 1.5 inch, crooked radian between 0.2 ~ 1.5, bending radius 2 ~ 0.3 m; Pipeline joining place is smooth circular arc.
5. a kind of pressed powder continuous combustion apparatus as claimed in claim 1, is characterized in that described mixing bunker (11) ratio of height to diameter is between 1.0 ~ 4.0.
6. a kind of pressed powder continuous combustion apparatus as claimed in claim 1, it is characterized in that described ignition stove wire (16) power is between 0.1 ~ 0.5 Kw, 3 ~ 6 limit shapes are formed in jet arrays (12) outer rim, resistance wire (16) is fixed on combustion bin (14) top 0.5 ~ 15 cm by insulating ceramics pipe, and its constant ignition temperature is 300 ~ 700
obetween C, by Control ignition stove wire (16), adopt the air switch protection of 2 ~ 8 A.
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| CN201410543414.9A CN104237452B (en) | 2014-10-15 | 2014-10-15 | A kind of pressed powder continuous combustion apparatus |
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| CN201410543414.9A CN104237452B (en) | 2014-10-15 | 2014-10-15 | A kind of pressed powder continuous combustion apparatus |
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| CN104237452B CN104237452B (en) | 2015-10-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108609590A (en) * | 2018-04-19 | 2018-10-02 | 浙江东瓷新材料有限公司 | A kind of beta-silicon nitride powder production line |
| CN108609589A (en) * | 2018-04-13 | 2018-10-02 | 浙江东瓷新材料有限公司 | A kind of beta-silicon nitride powder suspension reactor |
| CN109030706A (en) * | 2018-06-05 | 2018-12-18 | 北京理工大学 | A kind of combustion experimental device for preventing powder from reuniting in transit |
| CN110044962A (en) * | 2019-04-15 | 2019-07-23 | 沈阳建筑大学 | A kind of test device and method of continuous flowing combustible dust cloud kindling sensibility |
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| CN110044962B (en) * | 2019-04-15 | 2022-04-12 | 沈阳建筑大学 | Device and method for testing ignition sensitivity of continuous flowing combustible dust cloud |
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| CN104237452B (en) | 2015-10-28 |
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Inventor after: Xu Yao Inventor after: Lv Baoliang Inventor after: Li Wanxi Inventor after: Wang Liancheng Inventor before: Xu Yao Inventor before: Lv Baoliang Inventor before: Li Wanxi Inventor before: Wang Biancheng |
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