CN102071275A - Kiln device used for directly reducing iron - Google Patents
Kiln device used for directly reducing iron Download PDFInfo
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- CN102071275A CN102071275A CN 201110031627 CN201110031627A CN102071275A CN 102071275 A CN102071275 A CN 102071275A CN 201110031627 CN201110031627 CN 201110031627 CN 201110031627 A CN201110031627 A CN 201110031627A CN 102071275 A CN102071275 A CN 102071275A
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- combustion chamber
- kiln
- burner
- iron
- direct
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 35
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 230000002829 reductive effect Effects 0.000 abstract description 9
- 239000002737 fuel gas Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 description 18
- 239000003245 coal Substances 0.000 description 17
- 239000007789 gas Substances 0.000 description 14
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 238000005453 pelletization Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003034 coal gas Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 241000282817 Bovidae Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229940095674 pellet product Drugs 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the metallurgical technical field, in particular to a kiln device used for directly reducing iron. The kiln device of the invention comprises a kiln crown 1, a combustion air pipeline 2, a fuel gas pipeline 3, a nozzle, a material tank 6, a labyrinth seal 8, a kiln car 9, a baffle 5, an upper combustion chamber 10 between the kiln crown and the baffle, a reduction chamber 11 between the baffle and the material tank, a lower combustion chamber 12 between the material tank and the labyrinth seal, wherein the nozzle of the kiln device is divided into an upper nozzle 4 and a lower nozzle 7 which are separately arranged on the furnace wall of the upper combustion chamber 10 and the furnace wall of the lower combustion chamber 12; the fuel gas pipeline 3 is connected with the upper nozzle 4 and the lower nozzle 7; and the combustion air pipeline 2 is connected with the upper combustion chamber 10 and the lower combustion chamber 12, and the material tank 6 is supported by the kiln car 9. By adopting the kiln device of the invention, the equipment cost can be reduced and the reduction efficiency of the material can be increased.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to a kind of furnace equipment of direct-reduced iron.
Background technology
In China, existing direct-reduced iron production technique mainly is to adopt coal-based tunnel furnace pot type method, and a spot of coal-based rotary kiln method, coal-based shaft furnace process and rotary hearth furnace method are also arranged.Because there are technical elements in coal-based rotary kiln method, coal-based shaft furnace process and rotary hearth furnace method and operate first-class a lot of problem that exists.Such as: coal-based rotary kiln method ubiquity ring formation of rotary kiln; Reducing atmosphere is insufficient in the kiln; The oxidation of product later stage; Also there are fatal defectives such as pelletizing efflorescence if produce the metallized pellet product, thus the domestic in recent years coal-based rotary kiln direct-reduced iron production line surplus in the of ten that started altogether, mostly because these several problems, so far can't be continuously, ordinary production.The coal base reduction shaft furnace exists: furnace temperature is difficult to control, and reduction kiln core temperature can't reach the reducing process requirement: when stove inside and outside temperature was fit to technological temperature, raw material but appearred in the stove center; And when stove inside and outside temperature surpassed technological temperature, bonding between pelletizing (lump ore), caking were caused in the stove inside and outside, and then made scaffold in the stove, made the material can't direct motion.The drop temperature of material of reducing in addition is higher, and there is more important problem in oxidation easily, causes domestic coal-based shaft furnace small, and the diameter maximum is no more than 2m.Can't large-scale production.
For head it off, the someone proposes to adopt coal gas making, desulfurization, is warmed to 1200 more in recent years
OCarry out the reduction of gas base in the back supercharging input reduction shaft furnace about C.Technology is feasible, because 1200
OThe C temperature of gas is gone into stove, and in stove, temperature can only be 1200
OBelow the C, phenomenons such as bonding, caking, scaffold between pelletizing (lump ore) can not occur, can rise steadily along with the coal price, after coal changed into coal gas of high temperature, lower the temperature dedusting, desulfurization were warmed to 1200 to cooled coal gas with coal or coal gas more again
OAbout C, wasted the energy like this, increased energy consumption, dared to start, just rested in the academic research so this project is had no talent so far.Therefore the 30 years historical coal-based tunnel furnace pot type method technology of only passing by is more stable, ripe, and small project distributes relatively general.China produces 500000 tons of direct-reduced irons (sponge iron) per year at present, mostly is that coal-based tunnel furnace pot type method is produced; But traditional coal-based tunnel furnace pot type method has investment greatly; Floor space is wide; Must adopt expensive fire-resistant can (the ton reduced iron consumes fire-resistant can generally at 230-280 unit/ton), the technology backwardness causes energy consumption height, recovery time long, the labor force consumes reasons such as height, poor product quality, causes practical problemss such as production cost height, slack market.Although making China is output of steel first big country in the world, but the annual production of direct-reduced iron causes the direct-reduced iron of Iron And Steel Company that a large amount of breach is arranged not as good as the output of India's two weeks, a large amount of external direct-reduced irons of import of having to high price.Coal-based tunnel furnace pot type method is produced the present technology of reduced iron, can only adopt the fine iron breeze of TFe 〉=66% or iron scale directly to reduce reduced iron.If adopt low grade ore directly to reduce, its production cost can't be accepted.
Recently come, also there is the people promoting coal-based rotary hearth furnace method, but because of furnace construction is directly to contact with flame for the reduction material, this just must make reduced iron that oxidative phenomena is arranged, so the reduction ratio of the reduced iron that the rotary hearth furnace method is produced is the highest 68%, can't reach " national direct-reduced iron product (standard) standard " at all, can only with supporting molten branch usefulness such as hot stove in ore deposit or electric arc furnace, can not be used to produce the direct-reduced iron product separately.
Summary of the invention
The objective of the invention is deficiency, a kind of furnace equipment of direct-reduced iron is provided, when saving equipment cost, improved the reduction efficiency of material at the prior art existence.
The furnace equipment of direct-reduced iron of the present invention comprises the kiln top, the combustion air pipeline, gas pipeline, burner, the material pond, bent envelope, kiln car, this furnace equipment also comprises dividing plate, kiln top down with dividing plate on the space be upper combustion chamber, dividing plate is the reduction chamber with expecting the space on the pond down, and the material pond is a lower combustion chamber with the space that song is sealed up down, and the burner of this furnace equipment is divided into burner and following burner, be arranged at respectively on the furnace wall of upper combustion chamber and lower combustion chamber, gas pipeline connects goes up burner and following burner, and the combustion air pipeline inserts upper combustion chamber and lower combustion chamber, and kiln car is supporting the material pond.
Compared with prior art, characteristics of the present invention and beneficial effect thereof are:
1.The isolated naked light of dividing plate to the kiln heating, the charging tray that makes kiln car is finished reduction and is separated with slag iron in that reduction is indoor, the indoor meeting of this moment reducing forms the high density reducing gas of 300Pa～1100Pa, the air at two can't be entered, not only effectively prevented from oxidation and secondary oxidation, and the reductive agent consumption is very low, is the consumption of tunnel furnace method 1/3;
2. bent envelope is arranged below the material pond, promptly play the effect of lower clapboard, prevent to scurry on burning hot and stop to expect that the reducing gas in pond is descending, play the effect on the floor in material pond again;
3. the material pond respectively has a combustion chamber up and down, and the temperature of combustion chamber can reach 1350
OMore than the C, make the temperature-stable of material in the pond, upper and lower temperature difference is little, and it is unimpeded that waste gas is effluxed, and the too high material that causes of indoor local temperature of having avoided reducing is crossed reduction and reduction temperature and hanged down excessively and cause reducing material and reduce inadequate contradiction;
Can secondary oxidation when 4 the present invention make material in preheating and the not oxidation of when reduction and in cooling yet, can obtain the reduction ratio more than 98%;
5 the present invention need not expensive fire-resistant can, have saved the cost of equipment greatly;
6 the present invention need not to consider the water content of pelletizing balling-up; The fine ore rate; Normal temperature and hot strength; Severe condition such as tumbler index are expected in the pond as long as pelletizing can be packed into;
The waste heat of 7 waste gas of the present invention be used for heating coal gas or combustion air or cogeneration make it accomplish that as far as possible heat energy makes full use of again, reach can environmental protection purpose;
8 the present invention are applicable to various high and low grades ore deposit, especially are fit to difficult ore dressing, complex ore and industrial ferrous contained waste residue, can produce gravel iron and direct-reduced iron product.
Description of drawings
The structural representation of the furnace equipment of direct-reduced iron of the present invention, 1 kiln top wherein, 2 combustion air pipelines, 3 gas pipelines, burner on 4,5 dividing plates, 6 material ponds, 7 times burners, 8 bent envelopes, 9 kiln cars, 10 upper combustion chamber, reduction chambers 11,12 lower combustion chamber.
Embodiment
Below in conjunction with embodiment the present invention is elaborated, but protection scope of the present invention is not limited only to following embodiment:
The direct reduction kiln furnace apparatus of a pilot scale that adopts the present invention to build is long 22.5 meters, high 2.5 meters, wide 1.8 meters.Comprise kiln top 1, combustion air pipeline 2, gas pipeline 3, burner, material pond 6, bent envelope 8, kiln car 9, this furnace equipment also comprises dividing plate 5, kiln top down with dividing plate on the space be upper combustion chamber 10, dividing plate is reduction chamber 11 with expecting the space on the pond down, and the material pond is a lower combustion chamber 12 with the space that song is sealed up down, and the burner of this furnace equipment is divided into burner 4 and following burner 7, be arranged at respectively on the furnace wall of upper combustion chamber 10 and lower combustion chamber 12, gas pipeline 3 connects goes up burner 4 and following burner 7, and combustion air pipeline 2 inserts upper combustion chamber 10 and lower combustion chamber 12, and kiln car 9 is supporting material pond 6.
Earlier liquefied gas is fed gas pipeline 3, open combustion air pipeline 2 and gas pipeline 3 simultaneously and light liquefied gas, heated 8 hours, when making the temperature of lower combustion chamber reach 1300 ℃, after antelope stone iron block powder pelletizing and reductive agent mix near a river with the reduced material of TFe=40.46%, the kiln car 9 of packing into, advancing the car recovery time is 3.5 hours, high temperature section is 4 parking stalls, kiln car 9 operations are spaced apart 50 minutes, and the very high silicon carbide material upper spacer 5 of employing thermal conductivity has completely cut off the naked light in the upper combustion chamber 10, make the material pond 6 of kiln car 9 finish reduction and realize that slag iron separates in reduction chamber 11, the material pond a combustion chamber respectively arranged up and down, the temperature of combustion chamber can reach 1350
OMore than the C, make the temperature-stable in the material pond, upper and lower temperature difference is little, and it is unimpeded that waste gas is effluxed.The indoor meeting of this moment reducing forms the high density reducing gas of 300Pa～1100Pa, and the air at two can't be entered, not only effectively prevented from oxidation and secondary oxidation, and the reductive agent consumption is very low, and be the consumption of tunnel furnace method 1/3.
Whole material pond is all not moved in the state a horse, and reducing atmosphere is stable, abundant, and the reduction effect of iron material thoroughly, fully.The leading indicator of reduced material is:
The full iron weight percent that antelope stone pelletizing is reduced the gravel iron product after the processing accounts for 97.32%, and degree of metalization is 99.77%; Gravel iron rate is 95.68%, gravel iron density 7.47t/m
3, the mine tailing iron-holder is 0. 89%, the rate of recovery of iron is 98.97%.
Its every index is that inaccessible level is equipped in present any reduction.
Claims (2)
1. the furnace equipment of a direct-reduced iron, comprise the kiln top, the combustion air pipeline, gas pipeline, burner, material pond, bent envelope, kiln car, it is characterized in that this furnace equipment also comprises dividing plate, kiln top down with dividing plate on the space be upper combustion chamber, dividing plate down with the material pond on the space be to reduce the chamber, the material pond is a lower combustion chamber with bent space of sealing up down, the burner of this furnace equipment is divided into burner and following burner, is arranged at respectively on the furnace wall of upper combustion chamber and lower combustion chamber, and gas pipeline connects goes up burner and following burner, the combustion air pipeline inserts upper combustion chamber and lower combustion chamber, and kiln car is supporting the material pond.
2. the furnace equipment of a kind of direct-reduced iron according to claim 1, it is characterized in that being applicable to high and low grade iron ore, especially be fit to various difficult ore dressings, complex ore and industrial ferrous contained waste residue, can directly reduce and isolate fine gravel iron and direct-reduced iron product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031627 CN102071275A (en) | 2011-01-29 | 2011-01-29 | Kiln device used for directly reducing iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031627 CN102071275A (en) | 2011-01-29 | 2011-01-29 | Kiln device used for directly reducing iron |
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| Publication Number | Publication Date |
|---|---|
| CN102071275A true CN102071275A (en) | 2011-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110031627 Pending CN102071275A (en) | 2011-01-29 | 2011-01-29 | Kiln device used for directly reducing iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102071275A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643942A (en) * | 2012-04-16 | 2012-08-22 | 沈阳博联特熔融还原科技有限公司 | Reduction kiln equipment and method for directly reducing iron |
| CN104673953A (en) * | 2015-02-12 | 2015-06-03 | 唐竹胜 | Kiln device and method for directly reducing iron in multiple pipes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082254A (en) * | 1976-08-20 | 1978-04-04 | Ugo Brusa | Heat exchanger and application thereof to realize an ore reducing furnace |
| JPH10204515A (en) * | 1997-01-22 | 1998-08-04 | Mitsubishi Heavy Ind Ltd | Apparatus for producing reduced iron |
| JP2001152224A (en) * | 1999-11-30 | 2001-06-05 | Nippon Steel Corp | Moving hearth furnace capable of uniform heating |
| US20050229748A1 (en) * | 2004-03-31 | 2005-10-20 | Regents Of The University Of Minnesota | Linear hearth furnace system and methods regarding same |
| CN101215614A (en) * | 2007-01-06 | 2008-07-09 | 邹明 | Reducing chamber and heating chamber multilayer obturation alternation and fusion gasification combination metal smelting method |
| CN201621951U (en) * | 2010-03-10 | 2010-11-03 | 武汉理工大学 | Double-layer tunnel kiln |
-
2011
- 2011-01-29 CN CN 201110031627 patent/CN102071275A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082254A (en) * | 1976-08-20 | 1978-04-04 | Ugo Brusa | Heat exchanger and application thereof to realize an ore reducing furnace |
| JPH10204515A (en) * | 1997-01-22 | 1998-08-04 | Mitsubishi Heavy Ind Ltd | Apparatus for producing reduced iron |
| JP2001152224A (en) * | 1999-11-30 | 2001-06-05 | Nippon Steel Corp | Moving hearth furnace capable of uniform heating |
| US20050229748A1 (en) * | 2004-03-31 | 2005-10-20 | Regents Of The University Of Minnesota | Linear hearth furnace system and methods regarding same |
| CN101215614A (en) * | 2007-01-06 | 2008-07-09 | 邹明 | Reducing chamber and heating chamber multilayer obturation alternation and fusion gasification combination metal smelting method |
| CN201621951U (en) * | 2010-03-10 | 2010-11-03 | 武汉理工大学 | Double-layer tunnel kiln |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643942A (en) * | 2012-04-16 | 2012-08-22 | 沈阳博联特熔融还原科技有限公司 | Reduction kiln equipment and method for directly reducing iron |
| CN104673953A (en) * | 2015-02-12 | 2015-06-03 | 唐竹胜 | Kiln device and method for directly reducing iron in multiple pipes |
| CN104673953B (en) * | 2015-02-12 | 2016-05-11 | 唐竹胜 | A kind of kiln device of multitube DRI and method |
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Application publication date: 20110525 |