CN102277463B - Reduction furnace and device for producing direct reduced iron - Google Patents
Reduction furnace and device for producing direct reduced iron Download PDFInfo
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- CN102277463B CN102277463B CN2011102377263A CN201110237726A CN102277463B CN 102277463 B CN102277463 B CN 102277463B CN 2011102377263 A CN2011102377263 A CN 2011102377263A CN 201110237726 A CN201110237726 A CN 201110237726A CN 102277463 B CN102277463 B CN 102277463B
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Abstract
The invention provides a reduction furnace and a device for producing direct reduced iron. The device for producing the direct reduced iron comprises a coal gas generator, a reduction furnace connected with the coal gas generator, a flue gas dust collector connected with the reduction furnace, a cooling heat exchanger, a magnetic separator, a crushing machine and a screening machine, wherein the reduction furnace comprises a furnace body which is provided with a coal gas and air spraying inlet and a flue gas outlet, in which a combustion chamber is formed and of which the inner wall is provided with a refractory thermal insulation layer. The reduction furnace is characterized in that: a sealing reduction tank in which a cavity is formed is arranged in the combustion chamber of the furnace body, both ends of the sealing reduction tank pass through the wall of the furnace body and are arranged outside the furnace respectively, end covers are arranged at two external ports of the sealing reduction tank respectively, and one of the end covers is provided with a vent hole. Materials cannot be crushed in the reduction process, so the problems that a furnace lining is damaged, accidents are caused, the speed of reduction reaction is reduced, the energy consumption is increased and the like because the materials are crushed and easily molten and bonded in the reduction process are completely solved; meanwhile, reducing gas can be recycled, the environment is not polluted, sulfur is also recovered, and the comprehensive energy-saving effect is remarkable.
Description
Technical field
The present invention relates to a kind of reduction furnace, relate in particular to the coal-based direct reduction iron production equipment that comprises reduction furnace, belong to direct-reduced iron production unit technical field.
Background technology
The production of existing direct-reduced iron mainly is divided into gas base method and coal-based method.Wherein adopting coal-based method to produce direct-reduced iron and can make scale on output, is therefore the at first method of producing direct-reduced iron.The production technique of coal-based method direct-reduced iron and equipment mainly contain following several:
1, revolution cellar for storing things production technique: revolution cellar for storing things technique is the main flow technique that coal-based method direct-reduced iron is produced at present.German Krupp process (Krupp-CODIR) and Lurgi process (SL/RN) are arranged, the Nasuh Akar method (ACCAR) of India, Xi Erfa (Si 11), terraced Er Fa (TDR), and the Dai Weifa of Britain (DRC) etc.Wherein, the CODIR method of Germany is the typical case the most, occupied critical role in coal-based method direct-reduced iron, its advantage is as follows: product goes out cellar for storing things can improve the grade of iron by magnetic separation, quality product is better, become one of clean source of iron of electrosmelting high-quality steel, can be continuous, stably carry out large-scale production, equipment operation rate is higher, there is comparatively outstanding advantage in the technique of various revolutions cellar for storing things, and technology reaches its maturity, but shortcoming and the deficiency of its existence have: furnace charge is very easily made broken when rotating with the cellar for storing things body, thereby often can damage furnace lining because powder and coal ash stick on the body of cellar for storing things and form " ring formation ", cause the accident, operating rate is descended, be subject to the impact of " ring formation " simultaneously, can cause reduction temperature on the low side, top temperature can only reach 1100 ℃ of left and right, also can affect reduction rate in addition, and ature of coal requires too high, the ash fusion point of requirement coal must be higher than 1280 ℃, otherwise can continue " ring formation ", affect the throughput of single device.China builds and the revolution cellar for storing things technique that comes into operation has three kinds; Single stage method, two step method and cold bound pellet method.Single stage method is first the iron ore concentrate of fine grinding to be carried out to pelletizing, dry on drying grate, directly send into the revolution cellar for storing things after being preheating to 900 ℃ and carry out fixed and reduction, and all process steps completes continuously on a streamline.Two step method is first the iron ore concentrate of fine grinding to be carried out to pelletizing, after the high temperature oxidation roasting of 1300 ℃, makes acid pellet, then sends into the revolution cellar for storing things and reduced, and makes finished product.The cold bound pellet method is to add a small amount of compound binding agent pelletizing in fine powder of magnetite, under the low temperature of 200 ℃ after drying and consolidating, then sends into the revolution cellar for storing things and is reduced, and has omitted the process of high-temperature roasting oxidation concretion.
2, rotary hearth furnace production technique: rotary hearth furnace is because its speed of response is fast, the plurality of advantages such as adaptability to raw material is strong, be rapidly developed in recent years, rotary hearth furnace mainly contains these three kinds of Fastmet, Inmeto, Comwet, what wherein mechanize, level of automation were higher is the Fastmet method, there is advanced person, economy, reliable advantage, the direct-reduction iron processes developed the sixties by U.S. Midrex direct-reduction Inland Steel and Japanese kobe steel.Its advantage is: can make the ore deposit in raw material, coal dust is combined closely, at high temperature only need 10-20min to get final product fast restore, with short production cycle, raw material does not move at furnace bottom, can move ahead with furnace bottom, therefore can not make broken, to ore deposit, coal dust ball requirement of strength is not high, capacity usage ratio is high, reduzate C0 so burns and emits a large amount of heat energy through secondary, this heat energy is equivalent to half (being reported as three minutes two abroad) of aggregate supply heat, detrimental impurity (the zinc contained in raw material, plumbous, arsenic) can part in rotary hearth furnace or most volatilization enter in flue gas, be conducive to be recycled from flue gas, in stove, it is micro-negative pressure system, smokeless releases, without industrial pollution water, S0 in flue gas
2quantity discharged is significantly less than agglomerate, and cost of investment is lower than equal production-scale revolution cellar for storing things production technique.Its shortcoming is: rotary hearth furnace product ferrous grade low (TFe<85%), sulfur-bearing high (sulphur is O.1～O.2%), product is difficult to directly as the STEELMAKING PRODUCTION raw material, can only be as the little content of starting materials of blast furnace ironmaking, when add-on hour, can improve furnace processor, reduce coke ratio, but when add-on is larger, may exert an influence to blast-furnace smelting, the equipment operation parts are many in addition, and the running maintenance difficulty is large, and the quality of product and stability remain to be investigated.In a word, the application of rotary hearth furnace reduction device just further changes the general layout that China's direct-reduced iron is produced, and presents good greatly development upsurge.
3, cellar for storing things, tunnel production technique: domestic except adopting revolution cellar for storing things production direct-reduced iron, also adopt the cellar for storing things, tunnel to produce direct-reduced iron, more than 100 revolution cellar for storing things of Program Construction, annual production reaches 4,000,000 tons, and now oneself builds up 70, and reduced iron output is 300,000 tons.Cellar for storing things, tunnel process using powdered iron ore is reduced with the mode of going back the raw coal indirect heating, its shortcoming is: thermo-efficiency is low, energy consumption is high, direct-reduced iron per ton will consume the reduction coal of 500-650Kg, also to consume the heating coal of 450-550Kg, production cycle long (48-76h), it is seriously polluted that (solid waste such as reduction coal ash, useless reduction tank are many, dust is many), unstable product quality, single machine production ability are difficult to enlarge, therefore, cellar for storing things, tunnel technique is not the direction of China's direct-reduced iron development from now on.
Summary of the invention
The all deficiencies that exist for above-mentioned prior art, the invention provides a kind of iron transformation efficiency high, the reduction furnace that coal consumption is low.
Another object of the present invention is to provide a kind of cleaning type direct-reduced iron production equipment that comprises reduction furnace.
The present invention is to provide a kind of like this reduction furnace, comprise on it and establish combustion gas, the air entrance, exhanst gas outlet, establish combustion chamber in it, its inwall is established the body of heater of fire resistant heat preserving thermofin, it is characterized in that in the body of heater combustion chamber arranging in it sealing reduction tank with cavity, and the two ends of sealing reduction tank are placed in outside stove through furnace body wall respectively, and establish end cap in two external port of sealing reduction tank respectively, wherein an end cap is provided with venting hole, in order to material to be restored and reductive agent are put into to the cavity that seals the reduction tank, and after covering two end cap, combustion chamber internal combustion by combustion gas in spout sprays into body of heater, supplement combustion air simultaneously, carry out heat reduction with the material in sealing reduction tank.
Described body of heater is made as right cylinder, perhaps be made as polygonal cylinder, combustion gas, air entrance are located at the body of heater middle and lower part, and with gas supply pipe, the air delivery pipe of belt controling valve on it, be connected respectively, exhanst gas outlet is located at upper of furnace body, and be connected with the flue gas delivery pipe of belt controling valve on it, with delivery of fuel gas, combustion air in stove, and the flue gas produced that will burn is sent.
Described body of heater is made as the body of heater of a plurality of parallel connections, the combustion gas of each body of heater, air entrance respectively by the combustion gas of belt controling valve on it be in charge of, air is in charge of with corresponding gas header pipe, air main, is connected, exhanst gas outlet is in charge of with the flue gas house steward and is connected by the flue gas of belt controling valve on it, with the gas header pipe by corresponding, air main, to delivery of fuel gas, combustion air in each body of heater, and the flue gas that each body of heater internal combustion is produced is sent through the flue gas house steward.
Described sealing reduction tank vertically is located in the body of heater combustion chamber, its upper/lower terminal is placed in outside stove through the upper and lower wall of body of heater respectively, and establish upper and lower end cap in upper and lower two external port of sealing reduction tank respectively, wherein upper end cover is provided with venting hole, and be connected with the reducing gas transfer lime of belt controling valve on it, in order to recycle reducing gas.
Described vertical sealing reduction tank arranges a plurality of, and interval is located in the body of heater combustion chamber, venting hole on its upper end cover, carry to be in charge of with the reducing gas delivery manifold by the reducing gas of belt controling valve on it and be connected, with the reducing gas that each sealing reduction tank is produced, through reducing gas separately, carry to be in charge of to be pooled in house steward, to facilitate recycling.
The pipeline section that is positioned at body of heater one side of described air main is placed in the flue gas house steward, this pipeline section is provided with air and is in charge of, air is in charge of the combustion gas corresponding with body of heater through the flue gas house steward stretches out, the air entrance is connected, the end that enters of this pipeline section stretches out and is connected with air main through the flue gas house steward, after utilizing fume afterheat to add warm air, then it is right to send into the stove wife, keeps temperature-resistant in stove simultaneously, prevent that the energy consumption brought because of cooling from increasing, and on the impact of reduction reaction.
The present invention is to provide a kind of like this direct-reduced iron production equipment that comprises reduction furnace, comprise coal-gas producer, the reduction furnace be connected with coal-gas producer, the smoke duster be connected with reduction furnace, also comprise cooling heat exchanger, magnetic separator, crusher, sieve apparatus, wherein said reduction furnace comprises on it establishes coal gas, air entrance and exhanst gas outlet, establish combustion chamber in it, its inwall is established the body of heater of fire resistant heat preserving thermofin, it is characterized in that in the body of heater combustion chamber arranging in it sealing reduction tank with cavity, and the two ends of sealing reduction tank are placed in outside stove through furnace body wall respectively, and establish end cap in two external port of sealing reduction tank respectively, wherein an end cap is provided with venting hole, in order to material to be restored and reductive agent are put into to the cavity that seals the reduction tank, and after covering two end cap, the coal gas that coal-gas producer is produced and air mixed are by combustion gas, the air entrance sprays into the combustion chamber internal combustion in body of heater, carry out heat reduction with the material in sealing reduction tank, the venting hole of reducing gas on end cap produced in sealing reduction tank discharged, the flue gas produced in the body of heater combustion chamber is emptying after outlet send smoke duster to process, sulphur in the while recovered flue gas, after material reduction in sealing reduction tank, after discharging, port send cooling heat exchanger cooling, reclaim heat energy simultaneously, cooled material is after crusher in crushing, select reduced iron through magnet separator magnetic again, material after magnetic separation sieves through sieve apparatus, the thick coke powder reuse that must sieve, and the impurity under sieve send scrap yard.
Coal gas on described body of heater, the air entrance is connected with coal-gas producer by the gas conveying tube of belt controling valve on it, air delivery pipe by belt controling valve on it is connected with blower fan simultaneously, exhanst gas outlet is connected with smoke duster by the flue gas delivery pipe of belt controling valve on it, deliver to body of heater coal gas with the coal gas that coal-gas producer is produced through transfer lime, spray into the stove internal combustion after air entrance the air mixed sent here with air delivery pipe, and the flue gas that the stove internal combustion is produced is emptying after transfer lime is delivered to the smoke duster dedusting, sulphur in the while recovered flue gas.
Described cooling heat exchanger is positioned at sealing reduction tank below, this cooling heat exchanger comprises the chassis of Tape movement wheel, be located at its upper port material barrel with cover on chassis, be located at be filled with water cooling cylinder or the water spray cooling cylinder of material barrel periphery, the inwall of cooling cylinder of wherein spraying water is interval with annular water-supply pipe, spaced sprinkler head on the annular water-supply pipe, sealing reduction tank below after extremely having reduced so that mobile trolley used, open the lower end cover of sealing reduction tank below and the lid of material barrel upper port, after making reducing material fall into material barrel, close the lid, by the water-cooled that the material barrel outer wall is carried out, make the reduction heat material in material barrel cooling, prevent that reducing material is oxidized simultaneously.
Described smoke duster, magnetic separator, crusher, sieve apparatus are conventional equipment.
The present invention compared with prior art has following advantages and effect: adopt such scheme, make the material in sealing reduction tank can not make broken, and it is broken because making in reduction process thoroughly to have solved material, easily melting, bond and damage furnace lining, cause the accident, and make the reduction reaction Speed Reduction, increase the problems such as energy consumption, by being heated from sealing reduction tank outside, direct reduction reactor can be carried out smoothly, the transformation efficiency of gained reduced iron reaches more than 98%, and it is only 480Kg that reduced iron per ton on average consumes the mark coal, and can effectively control in reduced iron carbon content in O.1～0.25% scope, while reducing gas recoverable, flue gas is emptying again after dedusting, and the sulphur in synchronous recovered flue gas, both be conducive to cleaner production, free from environmental pollution, reclaimed again resource sulphur simultaneously, the synthesis energy saving effect is remarkable.
The accompanying drawing explanation
Fig. 1 is reduction furnace structural representation of the present invention;
The sectional drawing of overlooking that Fig. 2 is Fig. 1;
Sectional drawing is looked on the left side that Fig. 3 is Fig. 1;
Fig. 4 is direct-reduced iron production equipment structural representation of the present invention;
Fig. 5 be in Fig. 4 cooling heat exchanger A to figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
Reduction furnace provided by the invention comprises on it establishes combustion gas, air entrance 6, exhanst gas outlet 7, establish combustion chamber 17 in it, its inwall is established the body of heater 1 of fire resistant heat preserving thermofin 2, the interior sealing reduction tank 16 arranged in it with cavity 19 of body of heater 1 combustion chamber 17 wherein, and the two ends of sealing reduction tank 16 are placed in outside stove through body of heater 1 wall respectively, and establish end cap 15,18 in two external port of sealing reduction tank 16 respectively, end cap 15 wherein is provided with venting hole 14, described body of heater 1 is made as the rectangular cylinder of a plurality of parallel connections, combustion gas, air entrance 6 is located at the middle and lower part of body of heater 1, combustion gas, air entrance 6 is in charge of 4 by the combustion gas of belt controling valve on it and is connected with gas header pipe 3, gas header pipe 3 input terminuss are connected with gas furnace, combustion gas simultaneously, air entrance 6 also is in charge of 5 by the air of belt controling valve on it and is connected with the pipeline section 10 of air main 11, to pass through gas header pipe 3, air main 11 and pipeline section 10 are to the interior delivery of fuel gas of each body of heater 1, combustion air, exhanst gas outlet 7 is located at the top of body of heater 1, and by belt controling valve on it or not the flue gas of belt controling valve be in charge of 8 and be connected with flue gas house steward 9, with the flue gas that each body of heater 1 internal combustion is produced, through flue gas house steward 9, send, described sealing reduction tank 16 arranges a plurality of, and compartment of terrain vertically is located in body of heater 1 combustion chamber 17, the upper/lower terminal of each sealing reduction tank 16 is placed in outside stove through the upper and lower wall of body of heater 1 respectively, and establish upper end cover 15, lower end cover 18 in upper and lower two external port of each sealing reduction tank 16 respectively, wherein upper end cover 15 is provided with venting hole 14, each venting hole 14 is in charge of 13 by the reducing gas conveying of belt controling valve on it and is connected with reducing gas delivery manifold 12, by reducing gas delivery manifold 12, to recycle reducing gas, the pipeline section 10 that is positioned at body of heater one side of described air main 11 is placed in flue gas house steward 9, this pipeline section 10 is provided with air and is in charge of 5, air is in charge of 5 and is stretched out and the combustion gas corresponding with body of heater 1 through flue gas house steward 9, air entrance 6 is connected, the end that enters of this pipeline section 10 is connected with air main 11 through flue gas house steward 9 stretches out, air main 11 input terminuss are connected with blower fan 20, after utilizing fume afterheat to add warm air, send into again the stove wife right, keep temperature-resistant in stove simultaneously, prevent that the energy consumption of bringing because of cooling from increasing, and on the impact of reduction reaction, as Fig. 1, Fig. 2, Fig. 3.
Direct-reduced iron production equipment provided by the invention, comprise conventional coal-gas producer 21, the reduction furnace 1 be connected with coal-gas producer 21 by coal gas delivery manifold 3, the conventional smoke duster 22 be connected with reduction furnace 1, also comprise cooling heat exchanger 26, conventional crusher 27, magnetic separator 28 and sieve apparatus 29, wherein said reduction furnace 1 comprises on it establishes coal gas, air entrance 6 and exhanst gas outlet 7, establish combustion chamber 17 in it, its inwall is established the body of heater 1 of fire resistant heat preserving thermofin 2, body of heater 1 combustion chamber 17 is interior arranges in it sealing reduction tank 16 with cavity 19, and the two ends of sealing reduction tank 16 are placed in outside stove through body of heater 1 wall respectively, and establish end cap 15 in two external port of sealing reduction tank 16 respectively, 18, end cap 15 wherein is provided with venting hole 14, each coal gas on described body of heater 1, air entrance 6 is respectively by the gas manifold 4 of belt controling valve on it, gas main 3 is connected with coal-gas producer 21, be in charge of 5 by the air of belt controling valve on it simultaneously, pipeline section 10, air main 11 is connected with blower fan 20, exhanst gas outlet 7 is in charge of 8 by the flue gas of belt controling valve on it, flue gas house steward 9 is connected with smoke duster 22, the smoke outlet of smoke duster 22 is connected with chimney 23 by flue, emptying with the flue gas after dedusting is up to standard, the dust-exhausting port of smoke duster 22 is connected with acid-base neutralisation pond 24 by pipeline, acid-base neutralisation pond 24 is with solid, liquid separate tank 25 is connected, with the sulphur by flue gas be converted into sulfuric acid send in neutralization tank 24 with alkali in and after send into solid, in liquid separate tank 25, reclaim sulphur after sedimentation, described cooling heat exchanger 26 is positioned at sealing reduction tank 16 belows, this cooling heat exchanger 26 comprises the chassis 262 of Tape movement wheel 261, be located at the material barrel 266 of its upper port with cover 267 on chassis 262, be located at the water spray cooling cylinder 265 of material barrel 266 peripheries, the inwall of cooling cylinder 265 of wherein spraying water is interval with annular water-supply pipe 264, spaced sprinkler head 263 on annular water-supply pipe 264, so that mobile trolley used 262 sealing reduction tank 16 belows after completing to reduction, open the lower end cover 18 of sealing reduction tank 16 belows and the lid 267 of material barrel 266 upper port, close the lid 267 after making reducing material fall into material barrel 266, by the water-cooled that material barrel 266 outer walls are carried out, make the reduction heat material in material barrel 266 cooling, prevent that reducing material is oxidized simultaneously, as Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5.
Working process is: material to be restored and reductive agent are put into the cavity 19 of sealing reduction tank 16, and cover two end cap 15, after 18, the coal gas that coal-gas producer 21 is produced and air mixed are by combustion gas, air entrance 6 sprays into combustion chamber 17 internal combustion in body of heater 1, carry out heat reduction with the material in sealing reduction tank 16, the venting hole 14 of reducing gas on end cap 15 of sealing reduction tank 16 interior generations, reducing gas is carried and is in charge of 13, reducing gas house steward 12 delivers to post-order process equipment, to recycle reducing gas, the flue gas of body of heater 1 combustion chamber 17 interior generations is through exhanst gas outlet 7, flue gas is in charge of 8, flue gas house steward 9 is emptying after sending smoke duster 22 to process, sulphur in the while recovered flue gas, pass through the pipeline section 10 of the air main 11 of flue gas house steward 9 interior settings simultaneously, to mixing with coal gas again after air heating and spraying in body of heater 1, to take full advantage of fume afterheat, reduce to greatest extent energy consumption, after material reduction in sealing reduction tank 16, open lower end cover 18 and to fall into the cooling heat exchanger 26 of sealing reduction tank 16 belows cooling, afterwards after crusher 27 fragmentations, magneticly elect reduced iron through magnetic separator 28 again, material after magnetic separation is through sieve apparatus 29 screenings, the thick coke powder reuse that must sieve, and the impurity under sieve send scrap yard.
Claims (8)
1. a direct-reduced iron production equipment, comprise coal-gas producer, the reduction furnace be connected with coal-gas producer, the smoke duster be connected with reduction furnace, also comprise magnetic separator, crusher, sieve apparatus, wherein reduction furnace comprises on it and establishes coal gas, air entrance and exhanst gas outlet, establish the body of heater of combustion chamber in it, sealing reduction tank with cavity is set in combustion chamber in it, it is characterized in that establishing cooling heat exchanger below sealing reduction tank, this cooling heat exchanger comprises the chassis of Tape movement wheel, be located at its upper port material barrel with cover on chassis, be located at be filled with water cooling cylinder or the water spray cooling cylinder of material barrel periphery, the inwall of cooling cylinder of wherein spraying water is interval with annular water-supply pipe, spaced sprinkler head on the annular water-supply pipe.
2. direct-reduced iron production equipment according to claim 1, it is characterized in that described reduction furnace combustion chamber inwall establishes the fire resistant heat preserving thermofin, the two ends of the sealing reduction tank in combustion chamber are placed in outside stove through furnace body wall respectively, and establish end cap in two external port of sealing reduction tank respectively, wherein an end cap is provided with venting hole.
3. direct-reduced iron production equipment according to claim 1, it is characterized in that described reduction furnace body of heater is made as right cylinder, perhaps be made as polygonal cylinder, combustion gas, air entrance are located at the body of heater middle and lower part, and with gas supply pipe, the air delivery pipe of belt controling valve on it, be connected respectively, exhanst gas outlet is located at upper of furnace body, and is connected with the flue gas delivery pipe of belt controling valve on it.
4. direct-reduced iron production equipment according to claim 1, it is characterized in that described reduction furnace body of heater is made as the body of heater of a plurality of parallel connections, the combustion gas of each body of heater, air entrance respectively by the combustion gas of belt controling valve on it be in charge of, air is in charge of with corresponding gas header pipe, air main, is connected, exhanst gas outlet is in charge of with the flue gas house steward and is connected by the flue gas of belt controling valve on it.
5. direct-reduced iron production equipment according to claim 1, it is characterized in that described sealing reduction tank vertically is located in the body of heater combustion chamber, its upper/lower terminal is placed in outside stove through the upper and lower wall of body of heater respectively, and establish upper and lower end cap in upper and lower two external port of sealing reduction tank respectively, wherein upper end cover is provided with venting hole, and is connected with the reducing gas transfer lime of belt controling valve on it.
6. direct-reduced iron production equipment according to claim 5, it is characterized in that described vertical sealing reduction tank arranges a plurality of, and interval is located in the body of heater combustion chamber, each vertically the venting hole on the upper end cover of sealing reduction tank be in charge of with the reducing gas delivery manifold and be connected by the reducing gas conveying of belt controling valve it on.
7. direct-reduced iron production equipment according to claim 4, the pipeline section that is positioned at body of heater one side that it is characterized in that described air main is placed in the flue gas house steward, this pipeline section is provided with air and is in charge of, air is in charge of the combustion gas corresponding with body of heater through the flue gas house steward stretches out, the air entrance is connected, and the end that enters of this pipeline section stretches out and is connected with air main through the flue gas house steward.
8. direct-reduced iron production equipment according to claim 1, it is characterized in that coal gas, air entrance on described reduction furnace body of heater are connected with coal-gas producer by the gas conveying tube of belt controling valve on it, air delivery pipe by belt controling valve on it is connected with blower fan simultaneously, and exhanst gas outlet is connected with smoke duster by the flue gas delivery pipe of belt controling valve on it.
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| CN2011102377263A CN102277463B (en) | 2011-08-18 | 2011-08-18 | Reduction furnace and device for producing direct reduced iron |
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| CN2011102377263A CN102277463B (en) | 2011-08-18 | 2011-08-18 | Reduction furnace and device for producing direct reduced iron |
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| CN103131816B (en) * | 2013-03-25 | 2014-08-06 | 李乾宽 | Method for producing spongy iron through dual-based reduction and special chamber type smelting vertical furnace therefor |
| CN103602771B (en) * | 2013-11-19 | 2015-04-08 | 山东大学 | Local slope type reduction ironmaking furnace and process |
| CN104630404A (en) * | 2015-03-10 | 2015-05-20 | 中冶南方工程技术有限公司 | QDF (quiescent direct furnace) direct reduction technology |
| CN106288820B (en) * | 2015-06-05 | 2018-06-12 | 孙荣华 | Reduction furnace reduction section automatically controls water-adding system |
| CN106871108A (en) * | 2015-12-10 | 2017-06-20 | 哈尔滨市三和佳美科技发展有限公司 | Environmentally friendly coal-turned-gas boiler system |
| CN105441620A (en) * | 2016-01-05 | 2016-03-30 | 李建涛 | Coal-based direct reduction furnace and reduction method |
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| CN2254085Y (en) * | 1996-03-15 | 1997-05-14 | 冶金工业部北京冶金设备研究院 | Tank type furnace for producing sponge iron by direct reduction |
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