CN103225951B - Equipment for smelting steel and iron by pulverized coal as fuel - Google Patents
Equipment for smelting steel and iron by pulverized coal as fuel Download PDFInfo
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- CN103225951B CN103225951B CN201310161982.8A CN201310161982A CN103225951B CN 103225951 B CN103225951 B CN 103225951B CN 201310161982 A CN201310161982 A CN 201310161982A CN 103225951 B CN103225951 B CN 103225951B
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Abstract
The invention discloses equipment for smelting steel and iron by pulverized coal as fuel. A plurality of preheating chambers are communicated in sequence from the top down; the top of the uppermost preheating chamber is connected with a main air pipe; the lower part of the uppermost preheating chamber is communicated with a preheating conical body; the top of the preheating conical body is connected with a centrifugal fan; a medium-temperature kiln, a sub-high-temperature kiln and a high-temperature kiln are communicated through blanking conical bodies respectively; combustors are arranged in the kiln head chambers of the sub-high-temperature kiln and the high-temperature kiln; the top of a gas collection chamber is communicated with the lowermost preheating chamber; the bottom of the gas collection chamber is communicated with the kiln body of the medium-temperature kiln; the medium-temperature kiln, the sub-high-temperature kiln and the high-temperature kiln are communicated with the gas collection chamber; a combustor is arranged at the top of an insulation furnace; a molten iron flow groove is formed in the lower part of the insulation furnace; an iron and slag separation pond is arranged at the lower part of the insulation furnace; and an iron cake cooling machine is arranged below the kiln head chambers of the sub-high-temperature kiln and the high-temperature kiln and connected with an iron cake outlet of the insulation furnace. According to the equipment, heat in the smelting process is recovered and reused in other smelting steps, and the pulverized coal is adopted as the fuel, so that the expense is low, the utilization rate is high, the production cost is reduced, and the working efficiency is improved.
Description
Technical field
The present invention relates to field of steel metallurgy, specifically in steel smelting procedure, substitute with coal dust the equipment that coke does fuel iron and steel smelting.
Background technology
In current field of iron and steel smelting, for producing the qualified pig iron, be all generally adopt high temperature vertical kiln to smelt, its fuel mainly coke.Coke is responsible for the effects such as heat-generating agent, reductive agent, material main framing in blast-furnace smelting simultaneously, there is a lot of weak point: 1, coke cost is high in actual production process; 2, blast furnace waste heat can not be fully utilized, and waste heat loss is large, and the fuel quantity used in heat-processed is large; Waste heat in the scum of 3, discharging volatilizees in vain in an atmosphere, not only causes environmental pollution, and causes the serious waste of heat energy.
Summary of the invention
The present invention be directed to the many deficiencies existing for the pyrotic smelting of existing iron and steel employing shaft furnace, the steel smelting equipment that a kind of coal dust does main fuel for coke, fully recycles the heat energy produced in production process is provided.
Realize foregoing invention object by the following technical solutions: a kind of coal dust does the equipment of fuel iron and steel smelting, comprise primary heater unit, smelting device of heating, breather, attemperator and refrigerating unit,
A, primary heater unit comprise preheating cone-shaped body and preheating chamber, and multiple preheating chamber is through setting successively up and down, and the top of the preheating chamber of the superiors is connected with the air main with blanking hole, and the bottom of the preheating chamber of the superiors is communicated with preheating cone-shaped body; The top of preheating cone-shaped body is connected with centrifugal blower by pipeline;
B, smelting device of heating comprise the middle temperature kiln be set up in parallel up and down, secondary high temperature kiln and high temperature kiln, and middle temperature kiln is communicated with respectively by blanking cone with between high temperature kiln with secondary high temperature kiln, secondary high temperature kiln; The kiln hood indoor of secondary high temperature kiln and high temperature kiln are separately installed with the burner stretching into kiln body;
C, breather comprise collection chamber, air rate adjustment pipe and waste pipe, and collection chamber top is communicated with undermost preheating chamber, are communicated with bottom collection chamber with middle temperature kiln kiln body; The kiln hood room of middle temperature kiln, secondary high temperature kiln kiln tail room, high temperature kiln kiln tail room are communicated with collection chamber respectively by air rate adjustment pipe; High temperature kiln kiln tail room is communicated with respectively by waste pipe with collection chamber with middle temperature kiln kiln hood room, middle temperature kiln kiln tail room;
D, attemperator comprise holding furnace, and burner is equipped with at holding furnace top, and the body of heater outside of holding furnace bottom is provided with a molten iron trough, and the other end of this molten iron trough is arranged on the below of high temperature kiln molten iron outlet; The bottom of holding furnace is slag sluicing system pond, and the both sides in this slag sluicing system pond are respectively arranged with molten iron outlet and scum outlet; This holding furnace is communicated with collection chamber by air rate adjustment pipe;
E, refrigerating unit comprise scum cooler, and this scum cooler is arranged on the below of high temperature kiln and time high temperature kiln kiln hood room, exports be connected with the scum of holding furnace.
Burner in secondary high temperature kiln, high temperature kiln and holding furnace does fuel with coal dust.
Preheating chamber is conically shaped wide at the top and narrow at the bottom.
High temperature kiln kiln hood indoor are provided with a long-range burner and a short distance burner side by side.
One end of high temperature kiln is raised-diameter segment, and long-pending other kiln body sections that is greater than of the kiln body section of this raised-diameter segment amass.
The kiln body inwall of secondary high temperature kiln is evenly equipped with the short refractory brick along the distribution of kiln body spaced radial and high refractory brick.
The kiln body inwall of middle temperature kiln is evenly equipped with along the radial and axial short refractory brick all spaced apart of kiln body and high refractory brick.
Middle temperature kiln, secondary high temperature kiln, high temperature kiln are communicated with collection chamber respectively by respective air rate adjustment pipe with holding furnace, and each air rate adjustment pipe is respectively arranged with independently variable valve.
Compared with prior art, the heat energy produced in steel smelting procedure fully reclaims by this steel smelting equipment disclosed in this invention, and recycle is in other steps of smelting, adopt coal dust as fuel, not only fuel cost is low, and fuel availability is high, and utilization rate of waste heat is high, greatly reduce production cost, increase work efficiency.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is incubated kiln installation site schematic side view in the present invention.
Fig. 3 is time high temperature kiln refractory brick circle distribution schematic diagram.
Fig. 4 is time high temperature kiln refractory brick horizontal distribution schematic diagram.
Fig. 5 is middle temperature kiln refractory brick circle distribution schematic diagram.
Fig. 6 is middle temperature kiln refractory brick horizontal distribution schematic diagram.
In figure: centrifugal blower 1, waste gas header 2, blanking hole 3, air main 4, preheating cone-shaped body 5, preheating chamber 6, collection chamber 7, total blanking cone 8, air rate adjustment pipe 9, middle temperature kiln kiln hood room 10, high temperature kiln exhaust pipeline 11, high temperature kiln kiln tail room 12, secondary high temperature kiln kiln tail room 13, secondary high temperature kiln blanking cone 14, secondary high temperature kiln exhaust pipeline 15, secondary high temperature kiln 16, high temperature kiln 17, high temperature kiln raised-diameter segment 18, holding furnace molten iron outlet 19, holding furnace body of heater 20, holding furnace burning zone upper body 21, short distance burner 22, long-range burner 23, secondary high temperature kiln burner 24, holding furnace burner 25, middle temperature kiln blanking cone 26, middle temperature kiln kiln tail room 27, middle temperature kiln waste pipe 28, middle temperature kiln 29, holding furnace slag-drip opening 30, scum cooler 31, scum 32, molten iron trough 33, height-secondary kiln hood room 34, short refractory brick 35, high refractory brick 36, high temperature kiln molten iron outlet 37.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
This coal dust disclosed in this invention does the equipment of fuel iron and steel smelting, changes shaft furnace into rotary kiln, replaces coke as main heating fuel with coal dust.And utilize coal dust to do fuel, what its primary combustion and type of heating adopted is burner combustion heating, burner and rotary kiln with the use of, when burner is using coal dust as main fuel, not only cost is low, and rate of combustion is high, less wastage.
As shown in accompanying drawing 1-2, this equipment comprises primary heater unit, smelting device of heating, breather, attemperator and refrigerating unit, wherein primary heater unit is arranged on topmost, and be then that three rotary kilns of heating in smelting device are setting up and down, holding furnace is arranged on the sidepiece of high temperature kiln.
Primary heater unit comprises preheating cone-shaped body 5 and preheating chamber 6, in the present embodiment, and three preheating chamber through settings successively up and down.The top of the preheating chamber of the superiors is connected with the air main 4 with blanking hole 3, and the left and right sides of the preheating chamber of the superiors arranges a preheating cone-shaped body 5, two preheating cone-shaped bodys respectively and is communicated with the bottom of the superiors preheating chambers respectively by respective blanking device.The top of preheating cone-shaped body is connected with centrifugal blower 1 by waste gas header 2.The top of preheating cone-shaped body is communicated with air main respectively.
Wherein: preheating cone-shaped body is up big and down small conically shaped, because the wind speed in air main is larger, brought in the preheating cone-shaped body of both sides by distinguished and admirable after material enters air main by feed opening, the upper space of preheating cone-shaped body is comparatively large, and blast, wind speed are lower, the material brought into falls under gravity into cone-shaped body bottom, material enters in preheating chamber through bottom, in the process, material suspended in the waste gas compared with hot temperature degree, the surface-area of material exposes in atmosphere completely, realizes first time preheating; Preheating chamber is conically shaped wide at the top and narrow at the bottom, after material enters preheating chamber, the bottom reducing place wind speed of preheating chamber is higher, the material entering into preheating chamber bottom is blowed and sprayed to preheating chamber top, upper diameter is larger, blast, wind speed are lower, under gravity, material falls, when the gravity of the material gathered when the first layer preheating chamber bottom is greater than the buoyancy of wind-force, material is from dropping down onto second layer preheating chamber, and in this process, material swims in the high-temp waste gas of preheating chamber, material table area is exposed in high-temp waste gas completely, realizes the second time preheating of material; In like manner, material to enter in the second layer and third layer preheating chamber by complete preheating successively, finally drops down onto in collection chamber, and is entered in middle temperature kiln by total blanking cone.
Smelting device of heating comprises middle temperature kiln 29, secondary high temperature kiln 16 and high temperature kiln 17.Be communicated with by middle temperature kiln blanking cone 26 between middle temperature kiln kiln tail room 27 with secondary high temperature kiln kiln body; Secondary high temperature kiln kiln tail room 13 is communicated with by time high temperature kiln blanking cone 14 with between high temperature kiln kiln body, wherein:
1, high temperature kiln is arranged on the lowest layer, the heating unit of high temperature kiln is mounted in two burners in high temperature kiln kiln hood room 34, long-range burner 23 and short distance burner 22 respectively, short distance burner 22 is the heating blind areas in order to make up long-range burner 23 burner port rear portion, increase heat force intensity, the high-temperature zone of kiln body is increased.Burner all does fuel with coal dust, and individually controls.The gradient of high temperature kiln is generally 3-4.5:100, and feed end is high-end, and discharge end is low side.Hot junction due to high temperature kiln is provided with two burners, the supplementary air needed is more, raised-diameter segment 18 is designed in one end of high temperature kiln, the sectional area of the kiln body of this raised-diameter segment 18 is greater than the sectional area of other kiln bodies, oxygen needed for burner combustion can not only be met, and add air flow property.The thickness of the refractory brick on this hot junction amplifier kiln body inwall is all greater than the thickness of other position refractory brick of kiln body, extends its work-ing life;
2, secondary high temperature kiln is arranged on centre, share a kiln hood room with high temperature kiln, i.e. high-secondary kiln hood room 34.The heating unit of secondary high temperature kiln is arranged in height-secondary kiln hood room 34 burner stretched in time high temperature kiln kiln body, i.e. secondary high temperature kiln burner 24.The gradient of this high temperature kiln is 3-4.5:100, and feed end is high-end, and discharge end is low side.The kiln body inwall of secondary high temperature kiln is evenly equipped with the short refractory brick 35 along the distribution of kiln body spaced radial and high refractory brick 36, as shown in accompanying drawing 3-4, length direction along kiln body is that height is crisscross arranged, short refractory brick and high refractory brick spaced apart, one is the heating surface area in order to increase material, two is the work-ing life increasing refractory brick, increases heating surface area and the heat conduction efficiency of material.Temperature of charge in secondary high temperature kiln is higher, reach softening temperature, the frictional coefficient of storeroom increases, mobility is deteriorated, refractory brick on kiln wall is designed to height be interspersed for this reason, the distribution of its refractory brick axially sees it is the arrangement that a high row low arranges along kiln body, short refractory brick and high refractory brick form the effect of hopper, in kiln body rotation process, constantly material is spilt in kiln aerial, material table area is exposed in hot high-temp waste gas completely, adds thermal conductivity, improve the heating surface area of material, be conducive to the mobility of material;
3, middle temperature kiln is arranged on the superiors, the waste gas residual heat that the heat energy of its heating material produces from burner combustion in high temperature kiln, secondary high temperature kiln, and its gradient is 3-4.5:100, and feed end is high-end, and discharge end is low side.Middle temperature kiln kiln body inwall is evenly equipped with along the radial and axial short refractory brick 35 all spaced apart of kiln body and high refractory brick 36, as shown in figures 5-6, is the arrangement mode of high-low-high in kiln body length direction and circumferential direction.Short refractory brick and high refractory brick spaced apart, makes the surface-area of refractory brick increase, adds the heat conduction efficiency of material.The recessed district of refractory brick forms a scoop, along with the rotation of kiln body, spills material in the air, and the surface-area of material is all exposed in air, and thermo-efficiency is high.
Breather comprises collection chamber 7, air rate adjustment pipe and waste pipe, is mainly responsible for the gas communication between each equipment.Wherein the top of collection chamber is communicated with undermost preheating chamber, is communicated with bottom collection chamber by total blanking cone 8 with middle temperature kiln kiln body.Middle temperature kiln kiln hood room 10, secondary high temperature kiln kiln tail room 13, high temperature kiln kiln tail room 12 are communicated with collection chamber respectively by air rate adjustment pipe 9 with holding furnace body of heater 21, each air rate adjustment pipe is separately installed with the regulated valve controlled separately, these regulated valves mainly realize the fine setting of wind speed in high temperature kiln, secondary high temperature kiln, middle temperature kiln and holding furnace.High temperature kiln kiln tail room is communicated with by high temperature kiln exhaust pipeline 11 with middle temperature kiln kiln hood room; Secondary high temperature kiln kiln tail room is communicated with through time high temperature kiln exhaust pipeline 15 with middle temperature kiln kiln hood room; Middle temperature kiln kiln tail room 27 is communicated with by middle temperature kiln waste pipe 28 with collection chamber 7, and in this, warm kiln waste pipe 28 is high temperature kiln, the main discharge line of secondary high temperature kiln waste gas, and middle temperature kiln waste pipe is also provided with regulated valve.Exhaust pipeline in this device is all be discharged into by the hot gas flow in equipment high for temperature in the low equipment of temperature, the heat energy produced by the burner in high temperature kiln, secondary high temperature kiln by waste gas through in be discharged in collection chamber after warm kiln and exhaust pipeline, enter into primary heater unit, the low-temperature material that preheating enters continuously, realize the recycling of heat energy, and scum cooler is utilized effectively during the burner combustion of the waste heat of scum also in high temperature kiln, secondary high temperature kiln and holding furnace, and be discharged into middle temperature kiln for recycling along exhaust pipeline.Dotted arrow in accompanying drawing 1 is device interior gas flow, and solid arrow is device interior flow direction of material.Namely the air be preheated reclaimed is utilized by burner combustion by high temperature kiln, secondary high temperature kiln and holding furnace, its waste gas residual heat produced is discharged in middle temperature kiln through high temperature kiln exhaust pipeline and time high temperature kiln exhaust pipeline and is utilized, and the waste gas residual heat in middle temperature kiln is discharged in preheating chamber by middle temperature kiln waste pipe, thermal pretreatment is carried out to material; Hot gas flow in high temperature kiln, secondary high temperature kiln, middle temperature kiln and holding furnace also enters into collection chamber by air rate adjustment pipe, then enters preheating chamber with waste gas and carries out thermal pretreatment.
Holding furnace is arranged on the sidepiece of the kiln hood room of high temperature kiln and time high temperature kiln, comprises holding furnace body of heater and holding furnace burning zone upper body 21.Holding furnace burner 25 is equipped with at the top of holding furnace burning zone upper body 21, holding furnace body of heater outside is provided with a molten iron trough 33, its upper end is arranged on the below of high temperature kiln molten iron outlet 37, and this molten iron trough 33 is obliquely installed, and guarantees that molten iron can flow in holding furnace body of heater voluntarily.The holding furnace body of heater 20 of holding furnace bottom is slag sluicing system pond, and the both sides of holding furnace body of heater are respectively arranged with holding furnace molten iron outlet 19 and holding furnace slag-drip opening 30.Holding furnace burner 25 is equipped with at the top of holding furnace burning zone upper body 21, because molten iron can be cooled in the process being flowed into holding furnace by high temperature kiln, temperature reduces, this burner 25 mainly heats the molten iron entering holding furnace inside through molten iron trough 33 and is incubated, and the scum separator tank of holding furnace lower portion of furnace body can carry out gathering of short-term to molten iron and scum, in this agglomeration, molten iron is different with the density of scum, molten iron sinks down into bottom land in its action of gravity, and scum floats over molten iron surface.Molten iron outlet is lower than slag-drip opening, and from molten iron outlet discharge is pure iron water, and not containing scum, scum is transported by handling equipment and delivered to next process procedure after cooler cooling.When tapping a blast furnace, first open molten iron outlet and put molten iron, after molten iron is released, molten iron outlet is blocked, then opens slag-drip opening, scum is expelled on cooler, effectively accomplishes that pulp water is separated.In the present embodiment, holding furnace burning zone upper body and high temperature kiln are communicated with the kiln hood room of time high temperature kiln, the scum warm air that the air of burner combustion reclaims from kiln hood room, and temperature is higher.
The below of high temperature kiln and time high temperature kiln kiln hood room 34 is provided with a scum cooler 31, and this scum cooler 31 is connected with slag-drip opening.Generally in order to accelerate scum cooling, scum cooler generally adopts air-cooled, installs gas blower in the cooling bed below of refrigerant, and the heat stored by scum 32 is recycled by the kiln hood room of high temperature kiln and time high temperature kiln by the form of hot blast.
The process of this equipment iron and steel smelting is used to be:
The starting material of the present embodiment adopt Iron concentrate, and granularity is below 2mm, and rotary kiln rotating speed controls at 2-4 rev/min, kiln installation gradient is 3-4.5:100, and kiln body feed end is high-end, and discharge end is low side, starting centrifugal blower, is 8-15m/ second by the wind speed in governor valve control rotary kiln; Lighted by burner in rotary kiln, fuel is coal dust, starts to produce after kiln temperature reaches processing requirement;
Raw material enters air main by blanking hole, under distinguished and admirable drive, after the repeatedly preheating of preheating chamber, deliver to middle temperature kiln by total blanking cone carry out smelting preheating, thermal source in middle temperature kiln kiln body is from the heat energy waste gas produced after burner combustion in high temperature kiln, secondary high temperature kiln, material is powdery in this stage, good fluidity, in kiln, material is subject to hot mode mainly heat transfer by conduction, transmission of heat by convection and radiative transfer three kinds; In middle temperature kiln, the arrangement mode of refractory brick increases heating surface area, plays the effect of hopper, spills material in the air, plays the efficiency accelerating to heat;
Material at middle temperature kiln after abundant preheating, time high temperature kiln is delivered to by middle temperature kiln blanking cone at discharge end, the heat energy that burner in secondary high temperature kiln produces heats gradually, material in secondary high temperature kiln by hot mode mainly heat transfer by conduction, transmission of heat by convection and radiative transfer three kinds, the form spaced apart of the refractory brick on secondary high temperature kiln kiln body inwall increases heating surface area, play the effect of hopper, material is constantly spilt in the air, play the effect that material is accelerated to heat;
After material is tentatively smelted in secondary high temperature kiln, high temperature kiln is delivered to by secondary high temperature kiln blanking cone at discharge end, enter into the material of high temperature kiln, along with the rotation of kiln body, constantly move to discharge end, meanwhile, raw material constantly heats by the heat that the long-range burner in kiln and short distance burner produce, make it become liquid state from solid-state, the molten iron trough through discharge end is delivered in holding furnace;
To enter in the huge heat energy situation that the molten iron in holding furnace produces in the burner combustion of holding furnace insulation and heat, and gather at holding furnace lower portion of furnace body, because scum is different with molten iron density, in the process that it gathers, scum floats over molten iron upper strata, when molten iron gathers certain altitude, the slag-drip opening that molten iron exports and position is higher that open position is lower respectively, scum is discharged again after first discharging molten iron, by tapping on cooler, it is blower bottom cooler, to scum carry out air-cooled while, cooling air is by the waste-heat in waste residue, enter into high temperature kiln, secondary high temperature kiln kiln hood room, become for high temperature kiln, secondary high temperature kiln, air needed for burner combustion in holding furnace, this process makes scum waste heat obtain good second stage employ.
Claims (8)
1. make an equipment for fuel iron and steel smelting of coal dust, comprise primary heater unit, smelting device of heating, breather, attemperator and refrigerating unit, it is characterized in that:
A, primary heater unit comprise preheating cone-shaped body and preheating chamber, and multiple preheating chamber is through setting successively up and down, and the top of the preheating chamber of the superiors is connected with the air main with blanking hole, and the bottom of the preheating chamber of the superiors is communicated with preheating cone-shaped body; The top of preheating cone-shaped body is connected with centrifugal blower by pipeline;
B, smelting device of heating comprise the middle temperature kiln be set up in parallel up and down, secondary high temperature kiln and high temperature kiln, and middle temperature kiln is communicated with respectively by blanking cone with between high temperature kiln with secondary high temperature kiln, secondary high temperature kiln; The kiln hood indoor of secondary high temperature kiln and high temperature kiln are separately installed with the burner stretching into kiln body;
C, breather comprise collection chamber, air rate adjustment pipe and waste pipe, and collection chamber top is communicated with undermost preheating chamber, are communicated with bottom collection chamber with middle temperature kiln kiln body; The kiln hood room of middle temperature kiln, secondary high temperature kiln kiln tail room, high temperature kiln kiln tail room are communicated with collection chamber respectively by air rate adjustment pipe; High temperature kiln kiln tail room is communicated with respectively by waste pipe with collection chamber with middle temperature kiln kiln hood room, middle temperature kiln kiln tail room;
D, attemperator comprise holding furnace, and burner is equipped with at holding furnace top, and the body of heater outside of holding furnace bottom is provided with a molten iron trough, and the other end of this molten iron trough is arranged on the below of high temperature kiln molten iron outlet; The bottom of holding furnace is slag sluicing system pond, and the both sides in this slag sluicing system pond are respectively arranged with molten iron outlet and scum outlet; This holding furnace is communicated with collection chamber by air rate adjustment pipe;
E, refrigerating unit comprise scum cooler, and this scum cooler is arranged on the below of high temperature kiln and time high temperature kiln kiln hood room, exports be connected with the scum of holding furnace.
2. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, the burner in secondary high temperature kiln, high temperature kiln and holding furnace does fuel with coal dust.
3. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, described preheating chamber is conically shaped wide at the top and narrow at the bottom.
4. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, high temperature kiln kiln hood indoor are provided with a long-range burner and a short distance burner side by side.
5. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, one end of high temperature kiln is raised-diameter segment, and long-pending other kiln body sections that is greater than of the kiln body section of this raised-diameter segment amass.
6. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, the kiln body inwall of secondary high temperature kiln is evenly equipped with the short refractory brick along the distribution of kiln body spaced radial and high refractory brick.
7. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, the kiln body inwall of middle temperature kiln is evenly equipped with along the radial and axial short refractory brick all spaced apart of kiln body and high refractory brick.
8. coal dust according to claim 1 does the equipment of fuel iron and steel smelting, it is characterized in that, middle temperature kiln, secondary high temperature kiln, high temperature kiln are communicated with collection chamber respectively by respective air rate adjustment pipe with holding furnace, and each air rate adjustment pipe is respectively arranged with independently variable valve.
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| CN103225951B true CN103225951B (en) | 2015-02-11 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5403379A (en) * | 1992-05-15 | 1995-04-04 | Rgc Mineral Sands Limited | Reduction of titaniferous ores and apparatus |
| CN103011090A (en) * | 2012-12-06 | 2013-04-03 | 张跃 | Method for producing sulfur by using pyrolysis-reducing united technique |
| CN203274468U (en) * | 2013-05-06 | 2013-11-06 | 冯顺新 | Pulverized coal-fired iron and steel smelting equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8333821B2 (en) * | 2010-02-05 | 2012-12-18 | Innova Powders, Inc. | Environmentally friendly system and method for manufacturing iron powder |
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- 2013-05-06 CN CN201310161982.8A patent/CN103225951B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5403379A (en) * | 1992-05-15 | 1995-04-04 | Rgc Mineral Sands Limited | Reduction of titaniferous ores and apparatus |
| CN103011090A (en) * | 2012-12-06 | 2013-04-03 | 张跃 | Method for producing sulfur by using pyrolysis-reducing united technique |
| CN203274468U (en) * | 2013-05-06 | 2013-11-06 | 冯顺新 | Pulverized coal-fired iron and steel smelting equipment |
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