CN103194559A - Circular tunnel rotary hearth furnace and iron-making method - Google Patents
Circular tunnel rotary hearth furnace and iron-making method Download PDFInfo
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Abstract
The invention discloses a circular tunnel rotary hearth furnace and an iron-making method which are characterized in that wet pellets and concentrate powder enter the furnace directly and all the processes of drying, preheating, reduction, separation of residues and iron, cooling of furnace burden, recovery of afterheat and preheating of coal gas and air are continuously completed in the furnace. The invention provides a reduction furnace and a production method which have the advantages of large production scale, less investment, simplicity in process, energy conservation and environment protection and high-qualify and low-cost products for the material supply of special steel industry, powder metallurgy industry and boiler feedwater deoxidizing agent industry.
Description
Field of metallurgy under the present invention is a kind ofly can either produce direct-reduced iron, circular tunnel rotary hearth furnace and iron smelting method that again can the pure iron block of production higher-grade.
Direct-reduced iron (sponge iron, DRI) and the pure iron block of higher-grade have the pure characteristics of stable components and metallic iron, are the ideal materials of electrosmelting special steel, powder metallurgy and oiler feed deoxidation.The main flow technology of the direct-reduced iron of China's production now has tunnel furnace method, kiln process and rotary hearth furnace method, and the characteristics of aforesaid method are: the advantage of 1 tunnel furnace is that technology maturation and investment are less; Shortcoming is that applied fire-resistant can has heat insulation effect and high breakage rate, causes energy consumption and product cost two high.The advantage of 2 rotary kilns is the ripe relatively and automatization level height of technology; Shortcoming is that investment is big, exhaust temperature is high and furnace charge requirement harshness.The advantage of 3 rotary hearth furnaces is to adopt carbonaceous pelletizing, and reduction rate is fast; Shortcoming is the restriction that is subjected to manufacturing process, and the rotary hearth furnace diameter is restricted, and can not directly finish pelletizing drying, preheating, cooling and waste heat recovery operation in stove, causes that investment is big, technology is numerous and diverse and reactive loss is high.
The present invention seeks to the advantage of comprehensive prior art, overcome its shortcoming, provide a kind of less investment, cost is low, technology is simple, energy-conserving and environment-protective and adapt to a kind of circular tunnel rotary hearth furnace and the iron smelting method of scale operation.
Summary of the invention
1 circular tunnel rotary hearth furnace
1.1 circular tunnel body of heater.Described circular tunnel body of heater is to be tunnel like by a kind of transverse section that material of construction, refractory materials, heat-insulation and heat-preservation material and support equipment constitute, overlook the body of heater for circle, and according to processing requirement body of heater is divided into drying and preheating section, high temperature reduction section, cooling section and charging discharge zone.1.1.1 the opening for feed of described charging discharge zone and discharge port all are provided with the identical air curtain device of structure, its effect is the inside and outside gas communication of blocking-up body of heater.1.1.2 the body of heater top of described high temperature reduction section is provided with even layout and perpendicular to the burner group of combustion chamber, constitutes top ignition colony burner combustion device.1.1.3 the top, thermal energy exchange chamber of described cooling section is provided with the tubular type gas preheating device parallel with body of heater, plays the effect of waste heat recovery and preheating gas.1.1.4 the top, drying and preheating chamber of described drying and preheating section is provided with the tubular air preheater parallel with body of heater, plays the effect of waste heat recovery and preheated air.1.1.5 be provided with sand sealing groove at interior outer furnace wall middle part, its effect is to utilize the fire-resistant grains of sand of filling in the groove to cooperate with the sand sealing knife that arranges at the bottom of the rotary oven, constitutes the sand seal device that stops propagation of flame.1.1.6 the bottom at sand sealing groove is provided with water sealed tank, its effect is to utilize the recirculated water in the groove to cooperate with the water seal cutter that arranges at the bottom of the rotary oven, constitutes the water seal arrangement that stops gas leak.1.1.7 lay two circular rail with the same center of circle of body of heater at the body of heater bottommost, its effect is for orbit is provided at the bottom of the rotary oven.1.1.8 be provided with the circular supply line with the same center of circle of body of heater in side sand sealing groove bottom, its effect is that the mobile contact electric supply installation of assembling at the bottom of rotary oven is combined, for electrical source of power is provided at the bottom of the rotary oven.
1.2 at the bottom of the rotary oven.Be by at least 3 joints interconnective " motor-car " at the bottom of the described rotary oven, form at the bottom of a kind of circular rotary oven with water-cooled function.Be seated on the circular rail of circular bottom of furnace body at the bottom of the circular rotary oven, and around same center of circle cycle operation.Described motor-car all is made up of fire-resistant charging tray, heat-insulating load-bearing layer, circular sand sealing knife, circular water seal cutter, water-cooled furnace bottom, circulating water cooling device, rotating driving device and electric supply installation.Described fire-resistant charging tray is positioned at the motor-car top, and forms a narrow chamber between the indoor top of body of heater, this narrow chamber in the high temperature reduction section as the combustion chamber; In the drying and preheating section as the drying and preheating chamber; At cooling section as the thermal energy exchange chamber.
2, iron smelting method
2.1 carbonaceous pelletizing reducing process
2.1.1 process program and meaning.Utilize circular tunnel rotary hearth furnace of the present invention to possess functions such as charge preheating, reduction, cooling and waste heat recovery, be combined with the carbonaceous pelletizing with fast restore function, realize the purpose of high yield and low cost, for Electric furnace steel making and oiler feed reductor industry provide matter high inexpensive raw material.
2.1.2 raw material.Adopt powdered iron ore or other brown iron oxide, sweetening agent, coke powder and coal dust as making the ball raw material.Described raw material is through profit mill, drying, balling-up and glue coal dust protective layer operation outward, manufactures a kind of outer carbonaceous pelletizing of wrapping up in protective layer, as the reduction furnace charge of this technology; The employing preheating gas is fuel, and preheated air is oxygenant, combustion heat supplying; Utilize the kiln using waste heat from tail gas, as the thermal source of breeze moisture eliminator; By the tail gas of breeze moisture eliminator output, through after the purifying treatment, as air curtain gas.
2.1.3 processing sequence.By the pelletizing distribution device, in the empty charging tray that is in feed zone, one deck diameter that tiles continuously is the wet carbonaceous pelletizing of 5-25mm undried, along with the rotation at the bottom of the rotary oven, in opening for feed input stove, and order realizes the dry of pelletizing and is preheating to 800～1000 ℃ through the drying and preheating section.300～600 ℃ preheating gas is provided and is provided 300～600 ℃ preheated air by air preheater by the gas preheating device, by being arranged in the burner cohort at high temperature reduction section body of heater top, burning is implemented on the pelletizing surface of spraying in the combustion chamber.When the pelletizing temperature reaches 1200～1350 ℃ and kept 10～20 minutes; just finish reduction reaction; enter cooling section then and realize the pelletizing cooling; discharged by discharge zone at last; remove operation through protective layer again, can obtain to be applicable to the ball-type direct-reduced iron of Electric furnace steel making and oiler feed reductor industry.
2.2 slag iron separating technology
2.2.1 process program and meaning.Described slag iron separating technology is on the basis of above-mentioned carbonaceous pelletizing reducing process, increases by a ballast aggregate iron separation circuit, makes the product of final acquisition become the pure iron block of higher-grade, for beneficial conditions is created in later stage steel-making.
2.2.2 raw material.This technology desired raw material and pellet forming process are identical with the described scheme of 2.1.1, and the carbonaceous pelletizing diameter that adopts is advisable between 16--25mm.
2.2.3 processing sequence.At first adopt and to satisfy fuel and the burning measure that slag iron separates temperature required and processing requirement, when the carbonaceous pelletizing that enters reduction section, after 1200～1350 ℃ reduction operation, continue to be warming up to 1500～1550 ℃, and kept 6～10 minutes, the fusion that realizes pelletizing separates with slag iron, and then through overcooling, discharge and sorting operation, can obtain to be fit to the pure iron block of higher-grade of special steel production requirement.
2.3 fine ore tiling reducing process
2.3.1 process program and meaning.Described process program is to utilize rotary hearth furnace of the present invention; by being arranged on the powder tiling device of feed zone; in the charging tray at the bottom of the rotary oven; set up a kind of bottom and be reductive agent, middle for puron fine ore, top are that the furnace charge of protective layer is implemented reduction, its objective is to the powder metallurgy industry provides high-purity raw.
2.3.2 raw material.Adopt the low-sulfur ferrophosphorus fine ore of 69% above grade as the reduction furnace charge; Adopting powdery bituminous coal, hard coal or carbon powder is reductive agent; Adopting coal dust, reductive agent reclaimed materials, protective layer reclaimed materials and binding agent is that protective layer is made raw material.
2.3.3 processing sequence.At first by being arranged on the powder tiling device of feed zone, tiling one layer thickness is reductive agent and the compacting of 30-60mm continuously to the empty charging tray bottom that is in feed zone, forms the reduction bed of material; Tiling one layer thickness is the smart powder of iron and the compacting of 30-50mm continuously on reduction bed of material top, forms the breeze layer; Coal dust, reductive agent reclaimed materials, protective layer reclaimed materials, binding agent and suitable quantity of water are mixed and be pressed into the banded protective layer that thickness is 5-10mm, this band shape protective layer is tiled in the smart powder top of iron and compacting continuously.Above-mentioned furnace charge is along with the rotation at the bottom of the rotary oven, in opening for feed input stove.Furnace charge is gone into stove operation later on, and is identical with the carbonaceous pelletizing reduction method.By above-mentioned technology, can obtain to be applicable to the plate-like direct-reduced iron of field of powder metallurgy.
2.4 waste heat recovery
2.4.1 meaning.All there are a large amount of waste heats in the two ends of reduction section in above-mentioned technology, by following exhaust heat recovering method, with its recycling, reach the purpose of energy-saving and emission-reduction.
2.4.2 flue gas waste heat recovery.By the high-temperature flue gas that the combustion chamber produces, under the gravitation of fume extractor, with inverse motion at the bottom of the rotary oven, in preheating and drying chamber and pelletizing and air preheater heat exchange, realize wet bulb group drying, preheating and preheating of air; Flue gas by the discharge of preheating and drying chamber, keep 400～700 ℃ of temperature, the input breeze is in dry device, to behind the intercalation mill make the ball powder or the required powdered iron ore of tiling technology is implemented dry, last tail gas by moisture eliminator output, as air curtain gas, discharge by flue and chimney by residual exhaust through purifying treatment for part.
2.4.3 pelletizing waste heat recovery.Be arranged at the gas preheating device at top, thermal energy exchange chamber, by product output terminal input cooled coal gas, in thermal energy exchange chamber and hot pelletizing heat exchange, gas temperature increased, realize improving temperature of combustion, cooling pelletizing and waste heat recovery purpose; Import the pressure-fired cooled coal gas to the heat energy switch room by the product output terminal, the pressure-fired cooled coal gas is covered in hot pelletizing surface, and with the pelletizing inverse motion, finally enter the combustion chamber and participate in burning, play the pelletizing waste heat recovery, prevent the reducting pellet oxidation and accelerate the effect of pelletizing cooling.
The present invention has following advantage:
1, because circular tunnel rotary hearth furnace of the present invention, can realize the furnace diameter of random length, be reaction process and the waste heat reclaiming process of reduction furnace charge in stove, sufficient room and time is provided, realize disposablely finishing that stove is gone into by wet bulb group, finished product is come out of the stove and whole operations of waste heat recovery, not only simplified technology, reduced investment but also adapted to scale operation.2, the wet bulb group of the present invention's employing is directly into the heat exchange process of stove drying and preheating, gas preheating device, air preheater and pressure-fired coal gas and hot pelletizing, and effects of energy conservation and environmental protection is remarkable.3, the present invention adopts wet bulb group directly into the stove method, can exempt the required binding agent of carbonaceous pelletizing moulding, has not only reduced the pelletizing cost, and has improved the pelletizing grade.4, at the bottom of the water-cooled motor-car formula rotary oven that the present invention adopts, to every joint motor-car, existing relatively rotary hearth furnace technology has not only reduced the resistance at the bottom of the rotary oven with the power evenly distribute, and has ensured to start at the bottom of the rotary oven and stop freely and smooth running.5, iron smelting method of the present invention, can obtain to be suitable for special steel production pure iron block, be suitable for the spherical reduced iron of oiler feed deoxidation and be applicable to the plate-like direct-reduced iron of powder metallurgy.
Described in detail below by structural principle and the embodiment of accompanying drawing to the circular rotary hearth furnace of the present invention:
Accompanying drawing 1 is the transversary sectional view of circular tunnel rotary hearth furnace high temperature reduction section of the present invention;
Accompanying drawing 2 is transversary sectional views of circular tunnel rotary hearth furnace feed inlet and outlet air curtain of the present invention chamber;
Accompanying drawing 3 is circular tunnel rotary hearth furnace cooling section of the present invention and drying and preheating section top cross structure sectional view.
Figure number title: circular furnace wall in 1,2 outer ring furnace walls, 3 furnace roof cover plates, 4 thermal insulation layers, 5 top of combustion chamber flame retardant coatings, the inboard flame retardant coating in 6 combustion chambers, the outside, 7 combustion chambers flame retardant coating, 8 inner circular rail, the circular rail in 9 outsides, 10 water sealed tanks, 11 hot water delivery pipes, 12 cold water replenish pipe, 13 sand sealing grooves, 14 burners, 15 combustion chambers, 16 charging trays, 17 thermofins, 18 knee walls, 19 thermal insulating fillings, 20 sand sealing knifes, 21 water-cooled furnace bottoms, 22 water seal cuttves, 23 water pumps, 24 water absorption tubes, 25 furnace bottom rising pipes, 26 water-cooled machines, 27 worm reduction gears, 28 track main drive shafts, 29 worm screw power input wheels, 30 rail wheels, 31 circular electric wires, 32 mobile power supply devices, 33 air curtain walls, 34 air curtain wall cappings, 35 ventilating pits, 36 acts of gas circulation passages, 37 injectors, the 38 fire-resistant door curtains made of cloth, 39 recirculation blowers, 40 gas preheating devices (air preheater).
Referring to accompanying drawing 1
The circular tunnel body of heater that the figure shows is the circular tunnel body of heater that is made of the high temperature reduction section interior circular furnace wall 1, outer ring furnace wall 2, furnace roof cover plate 3, thermal insulation layer 4, top of combustion chamber flame retardant coating 5, the inboard flame retardant coating 6 in combustion chamber and the outside, combustion chamber flame retardant coating 7; Colony's burner 14 and combustion chamber 15 by evenly lay at the body of heater top constitute the top ignition firing system; Lay the circular rail 9 of inner circular rail 8 and the outside, the orbit at the bottom of the formation rotary oven by bottom of furnace body.Being located at the bottom of the rotary oven of circular tunnel body of heater inside, is that charging tray 16, thermofin 17, knee wall 18, thermal insulating filling 19 and sand seal device, water seal arrangement, circulating water cooling device and the rotary power unit by the top constitutes.Described sand seal device is positioned at the middle and upper part of body of heater, be to be constituted by the fire-resistant grains of sand that load in sand sealing groove 13, sand sealing knife 20 and the sand sealing groove with the refractory materials manufacturing, its principle is to utilize sand sealing knife to insert the effect of heat insulation that produces among the fire-resistant grains of sand, realizes the purpose that stops that the top high-temperature gas is propagated to furnace bottom.Described water seal and circulating water device are positioned at the middle and lower part of body of heater, be to replenish pipe 12, water-cooled furnace bottom 21, water seal cutter 22, water pump 23, water absorption tube 24, furnace bottom rising pipe 25 and water-cooled machine 26 by water sealed tank 10, hot water delivery pipe 11, cold water to constitute, principle of work and the program of said apparatus are: the motor of drive-motor 26 and water pump 23 all is to adopt water-cooling pattern, and its water jacket is interconnected.1-2 platform water circulating pump 23 is under the automatic control of temperature control unit, and the water absorption tube 24 by separately sucks cold water from the water sealed tank bottom of both sides, by the input of water-cooled machine water jacket bottom, enters water-cooled furnace bottom 21 through motor water jacket top after the supercharging.The recirculated water of input water-cooled furnace bottom by inserting the furnace bottom rising pipe 25 at water-cooled furnace bottom top, returns the water sealed tank of both sides.Recirculated water in the water sealed tank, it is the magnetic valve by temperature regulator control hot water delivery pipe 11 exit end, high-temperature water discharged out of the furnace cool off, replenish cold water by cold water supply pipe 12 again, circulation so repeatedly, realize neither influencing the water seal effect, can ensure water-cooled machine non-stop run in the optimal temperature environment again.Described rotating driving device is positioned at bottom of furnace body, be to be constituted by water-cooled machine 26, worm reduction gear 27, track main drive shaft 28, power input wheel 29, rail wheel 30, circular electric wire 31 and mobile power supply device 32, its principle of work is: water-cooled machine and worm reduction gear are fixed in the bottom of water-cooled furnace bottom, worm gear is assemblied in rail wheel main drive shaft middle part, by water-cooled machine 26 outputting powers, drive 29 rotations of worm screw power input wheel, worm screw drives worm gear, can realize that rail wheel is along the orbital motion purpose.Described mobile power supply device 32 is fixed on the suitable location at the bottom of the rotary oven, moves with the circular electric wire 31 that is fixed on the body of heater bottom to contact, for electrical source of power is provided at the bottom of the rotary oven.Circular electric wire 31 is by frequency conversion or potential device power supply, realizes the speed change of water-cooled machine.
Referring to Fig. 2
The air curtain device that the figure shows is positioned at the feed inlet and outlet place, and arrange two groups respectively, wherein one group of work, another group is standby, it is respectively to set up the 33 gentle curtain wall cappings 34 of one section air curtain wall in the outside of interior circular furnace wall 1, outer ring furnace wall 2 and furnace roof cover plate 3 that its structure is formed, and the ventilating pit 35 that formed space and this section furnace wall are reserved between air curtain wall and the furnace wall constitutes gas circulation channel 36.Injector 37 is arranged on the stove inner top, respectively establishes the fire-resistant door curtain made of cloth 38 that prevents gaseous diffusion together before and after injector, is provided with gas circulation blower fan 39 on curtain wall capping 34 tops.The working routine of this air curtain device is: from the cleaning of off-gas of air feeder, after recirculation blower 39 pressurizations, from the gas orifice continuous injection of injector 37 in charging tray, form the high pressure air curtain, return recirculation blower 39 by curtain gas circulation passage 36 then, circulation so repeatedly, the realization inside and outside gas communication of body of heater of can blockading can ensure the purpose of the smooth and easy input of pelletizing and discharge again.
Referring to Fig. 3
The body of heater that the figure shows belongs to structure identical drying and preheating section and cooling section, is to be made of parts such as interior circular furnace wall 1, outer ring furnace wall 2, furnace roof cover plate 3 and thermal insulation layers 4, has relatively removed flame retardant coating from reduction section.At the thermal energy exchange chamber of cooling section and the top of drying and preheating section 15, the tubular preheater 40 isometric with this section is housed, this preheater is the gas preheating device at cooling section, is air preheater in the drying and preheating section.Described gas preheating device is that cooled coal gas absorbs the contained heat energy of hot pelletizing in the thermal energy exchange chamber, 300～600 ℃ preheating gas is provided for combustion unit by discharge end input cooled coal gas.Described air preheater is that freezing air absorbs the contained heat energy of high-temperature flue gas in the drying and preheating chamber by feed end input freezing air, and 300～600 ℃ preheated air is provided for combustion unit.
Claims (4)
1. the technical scheme of circular tunnel rotary hearth furnace and iron smelting method comprises rotary hearth furnace and iron smelting method two parts, form at the bottom of the rotary oven of described rotary hearth furnace by circular tunnel body of heater and body of heater inside, it is characterized in that: the charging discharge gate of circular tunnel body of heater all is provided with the identical air curtain device of structure; At the body of heater top of high temperature reduction section, be provided with the top ignition combustion unit that is constituted by the burner group; Be provided with the tubular type gas preheating device parallel with body of heater at top, thermal energy exchange chamber, be provided with the tubular air preheater parallel with body of heater at top, drying and preheating chamber; At interior outer furnace wall middle part, be provided with sand sealing groove and water sealed tank; At the body of heater bottommost, lay two circular rail with the same center of circle of body of heater; In a side sand sealing groove bottom, be provided with the circular supply line with the same center of circle of body of heater; Be by at least 3 joints interconnective " motor-car " at the bottom of the rotary oven, form at the bottom of a kind of circular rotary oven with water-cooled function, be seated at the bottom of the circular rotary oven on the circular rail of circular bottom of furnace body, and center on same center of circle cycle operation; Described motor-car all is made up of fire-resistant charging tray, heat-insulating load-bearing layer, circular sand sealing knife, circular water seal cutter, water-cooled furnace bottom, circulating water cooling device, rotating driving device and electric supply installation.
2. according to the described iron smelting method of claim 1, comprise carbonaceous pelletizing reducing process, slag iron separating technology and fine ore tiling reducing process, it is characterized in that: the carbonaceous pelletizing reducing process is to adopt powdered iron ore or other brown iron oxide, sweetening agent, carbon dust and coal dust as making the ball raw material, described raw material is through profit mill, balling-up and glue coal dust protective layer operation outward, manufacture a kind of outer carbonaceous pelletizing of wrapping up in protective layer, as the reduction furnace charge of this technology; The employing preheating gas is fuel, and preheated air is oxygenant, combustion heat supplying; Utilize the kiln using waste heat from tail gas, as the thermal source of breeze moisture eliminator; By the tail gas of breeze moisture eliminator output, through after the purifying treatment, as air curtain gas; Carbonaceous pelletizing reducing process program is by distributor, and in the empty charging tray that is in feed zone, one deck diameter that tiles continuously is the wet carbonaceous pelletizing of 5-25mm undried, and wet carbonaceous pelletizing is realized dry through preheating section and is preheating to 800～1000 ℃; 300～600 ℃ preheating gas is provided and 300～600 ℃ preheated air is provided by air preheater by the gas preheating device, by being arranged in the burner cohort at high temperature reduction section body of heater top, spray in the pelletizing surface and implement burning, when the pelletizing temperature reaches 1200～1350 ℃ and kept 10～20 minutes, finish reduction reaction, and then remove operation and obtain finished product through pelletizing cooling, discharge and protective layer; Slag iron separating technology at first is to adopt fuel and the burning measure that can satisfy slag iron separation temperature and processing requirement, adopting diameter is the carbonaceous pelletizing of 16---25mm, after carbonaceous pelletizing is through 1200～1350 ℃ reduction operation, continue to be warming up to 1500～1550 ℃, and kept 6～10 minutes, the fusion that realizes pelletizing separates with slag iron, enters cooling, discharge and sorting operation then; Fine ore tiling reducing process desired raw material is to adopt the low-sulfur ferrophosphorus fine ore of 69% above grade as the reduction furnace charge, and adopting powdery bituminous coal, hard coal or carbon powder is reductive agent; Adopting coal dust, reductive agent reclaimed materials, protective layer reclaimed materials and binding agent is the raw material of protective layer; Fine ore tiling reducing process program is the feed zone at described rotary hearth furnace, the distribution device that adapts to powder tiling processing requirement is set, and utilize this device, tiling one layer thickness is reductive agent and the compacting of 30-60mm continuously to the empty charging tray bottom that is in feed zone, and tiling one layer thickness is the smart powder of iron and the compacting of 30-50mm continuously on coal dust top; Coal dust, protective layer reclaimed materials, reductive agent reclaimed materials, binding agent and suitable quantity of water mixed and be pressed into the banded protective layer that thickness is 5-10mm, this band shape protective layer is tiled in the smart powder top of iron and compacting continuously, above-mentioned material, along with the rotation at the bottom of the rotary oven, in opening for feed input stove, operation is identical with the carbonaceous pelletizing reduction method later on to go into stove; Flue gas waste heat recovery is the high-temperature flue gas that utilizes the combustion chamber to produce, and in preheating and drying chamber and pelletizing and air preheater heat exchange, realizes wet bulb group drying, preheating and preheating of air; Flue gas by discharge the preheating and drying chamber keeps 400～700 ℃ temperature, input breeze moisture eliminator, to behind the intercalation mill make the ball powder and the required powdered iron ore of tiling technology is implemented dry, the final section low temperature exhaust gas is through purifying treatment, and as air curtain gas, all the other tail gas are discharged by flue and rouge chimney; The pelletizing waste heat recovery is to utilize the gas preheating device that is located at top, thermal energy exchange chamber, makes coal gas in thermal energy exchange chamber and hot pelletizing heat exchange, realizes cooling pelletizing and waste heat recovery; Pressure-fired coal gas be by the product output terminal to heat energy switch room input pressure-fired cooled coal gas, the pressure-fired cooled coal gas be covered in hot pelletizing surface and with the pelletizing inverse motion, finally enter the combustion chamber and participate in burning.
3. the feature according to the described circulating water cooling device of claim 1, rotating driving device and electric supply installation is: circulating water device is positioned at the middle and lower part of body of heater, is to replenish pipe (12), water-cooled furnace bottom (21), water seal cutter (22), water pump (23), water absorption tube (24), furnace bottom rising pipe (25) and water-cooled machine (26) by water sealed tank (10), hot water delivery pipe (11), temperature regulator, magnetic valve, cold water to constitute; Rotating driving device is to be made of water-cooled machine (26), worm reduction gear (27), rail wheel main drive shaft (28), worm screw power input wheel (29) and rail wheel (30); Electric supply installation is to be made of circular electric wire (31) and mobile power supply device (32); Radio loop (31) is to provide power supply by frequency conversion or potential device, realizes the speed change of water-cooled machine.
4. the constitutional features according to the described air curtain device of claim 1 is: the gentle curtain wall capping of one section air curtain wall (33) (34) is respectively set up in the outside at interior circular furnace wall (1), outer ring furnace wall (2) and furnace roof cover plate (3), the ventilating pit (35) that formed space and this section furnace wall are reserved between air curtain wall and the furnace wall, constitute gas circulation channel (36), injector (37) is arranged on the stove inner top, before and after injector, respectively establish the fire-resistant door curtain made of cloth (38) that prevents gaseous diffusion together, be provided with gas circulation blower fan (39) on curtain wall capping (34) top.
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| CN201050937Y (en) * | 2007-06-06 | 2008-04-23 | 江西省陶研所海泰窑炉开发中心 | Ceramic tunnel kiln preheating belt modified structure |
| CN101963449B (en) * | 2009-07-22 | 2012-06-06 | 江苏省冶金设计院有限公司 | Double-layer ring-shaped rotary hearth furnace |
| JP2012207838A (en) * | 2011-03-29 | 2012-10-25 | Nippon Steel Engineering Co Ltd | Seal trough device of rotary hearth furnace |
| CN202018194U (en) * | 2011-04-15 | 2011-10-26 | 董亚飞 | High-temperature revolving bed reduction furnace |
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| CN104862480A (en) * | 2015-05-15 | 2015-08-26 | 北京神雾环境能源科技集团股份有限公司 | Rotary hearth furnace and metal smelting method using rotary hearth furnace |
| CN104862480B (en) * | 2015-05-15 | 2018-04-20 | 神雾科技集团股份有限公司 | Rotary hearth furnace and the method using the rotary hearth furnace metal smelting ore deposit |
| CN108130105A (en) * | 2018-01-31 | 2018-06-08 | 新疆乾海环保科技有限公司 | Metallurgical reduction coupling formed coke carbonization is total to smalls pyrolytic process and system |
Also Published As
| Publication number | Publication date |
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| CN103320564A (en) | 2013-09-25 |
| CN103320564B (en) | 2015-07-29 |
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Application publication date: 20130710 |