CN104357611B - A kind of method and apparatus utilizing partition rotary kiln reduction iron production - Google Patents
A kind of method and apparatus utilizing partition rotary kiln reduction iron production Download PDFInfo
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- CN104357611B CN104357611B CN201410509115.3A CN201410509115A CN104357611B CN 104357611 B CN104357611 B CN 104357611B CN 201410509115 A CN201410509115 A CN 201410509115A CN 104357611 B CN104357611 B CN 104357611B
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Abstract
The present invention relates to a kind of method and apparatus utilizing partition rotary kiln reduction iron production, comprise rotary kiln, partition rotary kiln, electric furnace refining equipment, generating set, high temperature feed bin, feeding chamber and discharging bin.The kiln body of partition rotary kiln is tube-in-tube structure, is made up of coaxial mounted inner core and urceolus, and the center of inner core is kiln thorax, is annular materials thorax between inner core and urceolus.Annular materials thorax is provided with and supports resistance to material, and reinforced ring is connected with the dynamic seal of kiln body with discharging ring.Reduction process is: 1. raw material powdered iron ore sends into thermophore preheating after mixing with lime powder.2. rotary kiln is by heating raw materials to 800 DEG C ~ 1000 DEG C.3. partition rotary kiln is entered after heating.4. pass into reducing gas, high temperature iron breeze is reduced into sponge iron in reducing atmosphere, reduction temperature 1000 DEG C ~ 1400 DEG C.5. sponge iron is refined into fine work iron to electric furnace refining equipment.The material of the flue gas partition heating annular materials thorax of kiln thorax of the present invention, optimizes the environment of reduction process, is conducive to improving the quality of going back original product.
Description
Technical field
The invention belongs to metallurgy and chemical production technical field, relate to a kind of method and apparatus utilizing partition rotary kiln reduction iron production.
Background technology
Reduction iron production is the important component part of Iron and Steel Production, its principal feature is as the disposable energy and reductive agent with mill coal, the oxide compound of iron is reduced in the molten state, there is briquet replacing coke, flow process is short, environmental pollution is little, construction investment is few, the advantages such as production cost is low, by field extensively good in the industry, the iron and steel enterprise of various countries competitively researchs and develops.The method of existing reduction iron production mainly contains COREX method (CN1010323B), DIOS method (CN1035136A), HISELT method (CN1037542A).Wherein COREX method suitability for industrialized production, other two kinds of methods are still under test.But all reduction iron production technology, due to aspects such as energy consumption are high, production cost is high, difficult and blast furnace technology is competed.
Publication number is the Chinese invention patent application of CN103937922A open " a kind of mixing reduction iron production equipment and iron smelting method: the raw materials such as fine ore, fine coal and flux are put into feed bin; raw material is heated by the stove cigarette in chimney in feed bin, and raw material is rendered in filling tube, then by universal sparger and flowed into rotary kiln.Drive-motor drives rotary kiln and the rotation of cylinder fire grate that the raw material of inflow rotary kiln and cylinder fire grate is heated further equably by the hot gas flowed.Part fine coal and fine ore generation chemical reaction generate iron protoxide and carbonic acid gas.The coal dust of fuel oil flame ignition cylinder fire grate posterior segment.Fall from cylinder fire grate grog out the comb fire grate in mixing reduction furnace and heated further by the pulverized coal flame sprayed into oxygen enrichment and reduce, the grog of fritter falls into reaction in molten steel pond and is reduced by carburizing and the water-gas that is blown into.Bulk grog is slipped to the coke heating and reduction of reducing at a slow speed and being burnt by oxygen enrichment support above pond.The molten iron generated in reaction in molten steel pond and slag flow into and reduce at a slow speed pond, from molten iron outlet and the outflow of slag pipe ".This technology overcomes that blast furnace ironmaking speed is slow, heat radiation is many, needs to use a large amount of coke and agglomerate, can not use the shortcoming of fine coal and fine ore.But the reduction of this patent application and heat-processed are carried out in a rotary kiln, the objectionable constituent in reduction process coal dust and flue gas easily enter in reduced iron, affect the quality of reduction iron production, and effectively can not utilize waste heat, increase the cost of reduction iron production.
Summary of the invention
The object of this invention is to provide a kind of method utilizing partition rotary kiln reduction iron production, by muffle type of heating for reduction process provides heat, optimize the environment of reduction process, improve reduction quality product, and make full use of flue gas generating, for reduced iron melting provides power.Another object of the present invention is to provide a kind of device utilizing partition rotary kiln reduction iron production.
Technical scheme of the present invention is: the method utilizing partition rotary kiln reduction iron production, and step comprises: 1. raw material powdered iron ore sends into thermophore preheating through charging equipment after mixing with lime powder.2. after preheating, raw material enters rotary kiln and is heated to 800 DEG C ~ 1000 DEG C.3. after heating, raw material enters partition rotary kiln through rotary kiln head-shield, high temperature feed bin, feeding chamber and reinforced ring.4. pass into reducing gas to partition rotary kiln, high temperature iron breeze is reduced into sponge iron in reducing atmosphere, reduction temperature 1000 DEG C ~ 1400 DEG C.5. sponge iron is through discharging ring to discharging bin, and then to electric furnace refining equipment, is refined into fine work iron in electric furnace.
Reducing gas is hydrogen, carbon monoxide or hydrogen and carbon mono oxide mixture, and in hydrogen and carbon mono oxide mixture, the volume percent of hydrogen and carbon monoxide is 50 ~ 70:50 ~ 30.After the reduction of partition rotary kiln, tail gas is used as the fuel of rotary kiln burner.The flue gas of partition rotary kiln burning is used for generating set cogeneration, and the electric power that generating set sends is used as the power of electric furnace refining equipment refining sponge iron.
The present invention utilizes the device of partition rotary kiln reduction iron production, comprises rotary kiln, charging equipment and thermophore, and rotary kiln is provided with rotary kiln hood, rotary kiln head-shield and burner.Charging equipment is connected with thermophore, and thermophore is connected with rotary kiln by rotary kiln hood.Device is provided with partition rotary kiln, electric furnace refining equipment, high temperature feed bin, feeding chamber and discharging bin.Partition rotary kiln comprises kiln body, partition kiln head cover, partition kiln hood, reinforced ring, discharging ring and coal dust burner.Kiln body is tube-in-tube structure, is made up of coaxial mounted inner core and urceolus, and the center of inner core is kiln thorax, is annular materials thorax between inner core and urceolus.Annular materials thorax is provided with and supports resistance to material, and reinforced ring is connected with the dynamic seal of kiln body with discharging ring.Rotary kiln is connected with the annular materials thorax of partition rotary kiln with reinforced ring by rotary kiln head-shield, high temperature feed bin, feeding chamber successively.Annular materials thorax is by discharging ring and discharging bin and electric furnace refining equipment connection.Discharging ring is provided with reducing gas entrance, and described reinforced ring is provided with reduction offgas outlet.Top and the partition kiln hood of thermophore are provided with exhanst gas outlet, and exhanst gas outlet is connected with blowdown system.
Device is provided with generating set and converting equipment, and the exhanst gas outlet of partition rotary kiln is connected with blowdown system by generating set.Generating set is connected with electric furnace refining circuitry by converting equipment.Be provided with material flight in reinforced ring, material flight is arranged on the ingress of feed port.Annular materials thorax is provided with material baffle, and material baffle is arranged on the exit of feed port.Reinforced ring and be provided with sealing mechanism between discharging ring and kiln body, sealing mechanism is rotary seal mechanism.Be provided with reinforced lock between feeding chamber and reinforced ring, between discharging ring and discharging bin, be provided with discharge lock.Reduction offgas outlet is connected to the fuel inlet of rotary kiln burner by gas communication pipeline, make the fuel of rotary kiln with tail gas after reduction.
The present invention utilizes the method and apparatus of partition rotary kiln reduction iron production, is heated the material be reduced by rotary kiln, utilizes partition rotary kiln to reduce.Partition rotary kiln is by the kiln body of inner/outer drum structure, inner core is made to be the kiln thorax that fuel combustion and flue gas circulate, it is the annular materials thorax of calcining materials between inner/outer tube, the material of the flue gas partition heating annular materials thorax that the burning of kiln thorax produces, flue gas is avoided directly to contact with material, optimize the environment of reduction process, be conducive to improving the quality of going back original product.The exhanst gas outlet of partition rotary kiln is connected with device for generating power by waste heat, utilizes the cogeneration of combustion product gases, takes full advantage of heat sources, reduces the energy expenditure of rotary kiln.The electrosmelting that generating set electricity is reduced iron provides power, can save the energy, improves production capacity, optimizes allocation of resources.After the reduction of partition rotary kiln, tail gas is used as the fuel of rotary kiln burner, makes full use of the fuel that inflammable gas unexhausted in reduction process makes heating iron powder, avoids the wasting of resources.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the present invention utilizes the device of partition rotary kiln reduction iron production;
Fig. 2 is that partition rotary kiln feeds in raw material the cross-sectional view at ring place;
Fig. 3 is partition rotary kiln cross-sectional view.
Wherein:
1-charging equipment, 2-thermophore, 3-rotary kiln, 4-rotary kiln head-shield, 5-burner, 6-high temperature feed bin, 7-feeding chamber, 8-reinforced lock, 9-reinforced ring, 10-generating set, 11-annular materials thorax, 12-kiln thorax, 13-partition rotary kiln, 14-discharging ring, 15-discharging bin, 16-electric furnace refining equipment, 17-coal dust burner, 18-partition kiln head cover, 19-discharge lock, 20-converting equipment, 21-partition kiln hood, 22-sealing mechanism, 23-reinforced ring, 24-gas communication pipeline, 25-rotary kiln hood, 26-reduction offgas outlet, 27-material flight, 28-feed port, 29 material baffles, 30-support resistance to material.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.Scope is not limited to embodiment, and those skilled in the art make any change and also belong to the scope of protection of the invention in the scope that claim limits.
The present invention utilizes the device of partition rotary kiln reduction iron production as shown in Figure 1, comprises charging equipment 1, thermophore 2, rotary kiln 3, partition rotary kiln 13, generating set 10, converting equipment 20, electric furnace refining equipment 16, high temperature feed bin 6, feeding chamber 7 and discharging bin 15.Rotary kiln is provided with rotary kiln hood 25, rotary kiln head-shield 4 and burner 5, and burner is geseous fuel burner, and burner is located at rotary kiln head-shield, and rotary kiln hood is provided with exhanst gas outlet.Partition rotary kiln comprises kiln body, partition kiln head cover 18, partition kiln hood 21, reinforced ring 9, discharging ring 14 and coal dust burner 17.As shown in Figure 3, kiln body is tube-in-tube structure, is made up of coaxial mounted inner core and urceolus, and the center of inner core is kiln thorax 12, is annular materials thorax 11 between inner core and urceolus.Annular materials thorax is provided with and supports resistance to material 30, and reinforced ring is connected with the dynamic seal of kiln body with discharging ring.Charging equipment is connected with thermophore, thermophore is connected with rotary kiln by rotary kiln hood, rotary kiln is connected with the annular materials thorax of partition rotary kiln with reinforced ring by rotary kiln head-shield, high temperature feed bin, feeding chamber successively, and annular materials thorax passes through discharging ring and discharging bin and electric furnace refining equipment connection.Discharging ring is provided with reducing gas entrance, and reinforced ring is provided with reduction offgas outlet 26.Top and the partition kiln hood of thermophore are provided with exhanst gas outlet, and the exhanst gas outlet of thermophore is connected with blowdown system.The exhanst gas outlet of partition rotary kiln is connected with blowdown system by generating set.Generating set is connected with electric furnace refining equipment 16 circuit by converting equipment.As shown in Figure 2, be provided with material flight 27 in reinforced ring 9, material flight is arranged on the ingress of feed port 28, and annular materials thorax 11 is provided with material baffle 29, and material baffle is arranged on the exit of feed port.Reinforced ring 9 and be provided with sealing mechanism 22 between discharging ring 14 and kiln body, sealing mechanism is rotary seal mechanism.Be provided with reinforced lock 8 between feeding chamber 7 and reinforced ring 9, between discharging ring 14 and discharging bin 15, be provided with discharge lock 19.Reduction offgas outlet 26 is connected to the fuel inlet of rotary kiln burner by gas communication pipeline 24, make the fuel of rotary kiln burner with the reduction tail gas after reduction.Generating set comprises steam boiler, steam turbine and generator, and steam coils established by steam boiler, and steam coils is connected with steam turbine, and steam turbine is coaxially connected with generating set.
The present invention utilizes the process of partition rotary kiln reduction iron production to be that 1. raw material powdered iron ore sends into thermophore 2 preheating through charging equipment 1 after mixing with lime powder, and with the smoke pre-heating powdered iron ore raw material of burning in rotary kiln 3, after preheating, temperature is 200 ~ 300 DEG C.Lime powder is used as the slag former of deoxy iron-smelting.2. after preheating, raw material enters rotary kiln 3 through rotary kiln hood 25, utilizes burner combustion by heating raw materials to 900 DEG C ~ 1000 DEG C, the useless flue gas after heating raw through exhanst gas outlet to thermophore preheating material.3. after heating, raw material enters partition rotary kiln 13 through rotary kiln head-shield 4, high temperature feed bin 6, feeding chamber 7, reinforced lock 8 and reinforced ring 9.4. pass into reducing gas by the reducing gas entrance on discharging ring to partition rotary kiln, reducing gas is hydrogen and carbon mono oxide mixture, and in gas mixture, the volume percent of hydrogen and carbon monoxide is 50:50.The material that coal dust burner 17 burns in muffle heating partition rotary kiln annular materials thorax 11 provides heat for reduction reaction.Powdered iron ore is reduced into sponge iron in reducing atmosphere, reduction temperature 1200 ± 50 DEG C.5. sponge iron is through discharging ring 14 to discharging bin 15, and then arrive electric furnace refining equipment 16 through discharge lock 19, in electric furnace, be refined into fine work iron, the fine work iron be smelt goes out device.Flue gas releases heat through exhanst gas outlet to generating set at kiln thorax 12, and utilize waste heat generation steam, steam driven steam turbine rotates, and drive electrical generators group generates electricity.The electric energy that waste heat sends is used as the electric power of electric furnace refining equipment 16 refining sponge iron.
Claims (10)
1. utilize a method for partition rotary kiln reduction iron production, step comprises: 1. raw material powdered iron ore sends into thermophore (2) preheating through charging equipment (1) after mixing with lime powder; 2. after preheating, raw material enters rotary kiln (3) and is heated to 800 DEG C ~ 1000 DEG C; 3. after heating, raw material enters partition rotary kiln (13) through rotary kiln head-shield (4), high temperature feed bin (6), feeding chamber (7) and reinforced ring (9); 4. pass into reducing gas to partition rotary kiln, high temperature iron breeze is reduced into sponge iron in reducing atmosphere. reduction temperature 1000 DEG C ~ 1400 DEG C; 5. sponge iron is through discharging ring (14) to discharging bin (15), and then to electric furnace refining equipment (16), is refined into fine work iron in electric furnace.
2. the method utilizing partition rotary kiln reduction iron production according to claim 1, it is characterized in that: described reducing gas is hydrogen, carbon monoxide or hydrogen and carbon mono oxide mixture, in hydrogen and carbon mono oxide mixture, the volume percent of hydrogen and carbon monoxide is 50 ~ 70:50 ~ 30.
3. the method utilizing partition rotary kiln reduction iron production according to claim 1, is characterized in that: after described partition rotary kiln (13) reduction, tail gas is used as the fuel of rotary kiln (3) burner (5).
4. the method utilizing partition rotary kiln reduction iron production according to claim 1, it is characterized in that: the flue gas that described partition rotary kiln (13) is burnt is for generating set (10) cogeneration, and the electric power that generating set sends is used as the power of electric furnace refining equipment (16) refining sponge iron.
5. utilize a device for partition rotary kiln reduction iron production, it is characterized in that: comprise charging equipment (1), thermophore (2) and rotary kiln (3), described rotary kiln is provided with rotary kiln hood (25), rotary kiln head-shield (4) and burner (5); Charging equipment is connected with thermophore, and thermophore is connected with rotary kiln by rotary kiln hood, it is characterized in that: described device is provided with partition rotary kiln (13), electric furnace refining equipment (16), high temperature feed bin (6), feeding chamber (7) and discharging bin (15); Described partition rotary kiln comprises kiln body, partition kiln head cover (18), partition kiln hood (21), reinforced ring (9), discharging ring (14) and coal dust burner (17); Described kiln body is tube-in-tube structure, is made up of coaxial mounted inner core and urceolus, and the center of inner core is kiln thorax (12), is annular materials thorax (11) between inner core and urceolus; Described annular materials thorax is provided with and supports resistance to material (30), and described reinforced ring is connected with the dynamic seal of kiln body with discharging ring; Described rotary kiln is connected with the annular materials thorax of partition rotary kiln with reinforced ring by rotary kiln head-shield, high temperature feed bin, feeding chamber successively; Described annular materials thorax is by discharging ring and discharging bin and electric furnace refining equipment connection; Described discharging ring is provided with reducing gas entrance, and described reinforced ring is provided with reduction offgas outlet (26); Top and the partition kiln hood of described thermophore are provided with exhanst gas outlet, and described exhanst gas outlet is connected with blowdown system.
6. the device utilizing partition rotary kiln reduction iron production according to claim 5, is characterized in that: described device is provided with generating set (10) and converting equipment (20); The exhanst gas outlet of described partition rotary kiln is connected with blowdown system by generating set; Described generating set is connected with electric furnace refining equipment (16) circuit by converting equipment.
7. the device utilizing partition rotary kiln reduction iron production according to claim 6, is characterized in that: be provided with material flight (27) in described reinforced ring (9), described material flight is arranged on the ingress of feed port (28); Described annular materials thorax (11) is provided with material baffle (29), and described material baffle is arranged on the exit of feed port.
8. the device utilizing partition rotary kiln reduction iron production according to claim 5, is characterized in that: described reinforced ring (9) and be provided with sealing mechanism (22) between discharging ring (14) and kiln body, and described sealing mechanism is rotary seal mechanism.
9. the device utilizing partition rotary kiln reduction iron production according to claim 5, it is characterized in that: be provided with reinforced lock (8) between described feeding chamber (7) and reinforced ring (9), between described discharging ring (14) and discharging bin (15), be provided with discharge lock (19).
10. the device utilizing partition rotary kiln reduction iron production according to claim 5, is characterized in that: described reduction offgas outlet (26) is connected to the fuel inlet of rotary kiln burner by gas communication pipeline (24).
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