WO2015088092A1 - 용철제조방법 및 용철제조장치 - Google Patents
용철제조방법 및 용철제조장치 Download PDFInfo
- Publication number
- WO2015088092A1 WO2015088092A1 PCT/KR2013/012113 KR2013012113W WO2015088092A1 WO 2015088092 A1 WO2015088092 A1 WO 2015088092A1 KR 2013012113 W KR2013012113 W KR 2013012113W WO 2015088092 A1 WO2015088092 A1 WO 2015088092A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reformer
- gas
- reduced iron
- iron
- paragraph
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 463
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 130
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 101
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 36
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 36
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 29
- 238000002407 reforming Methods 0.000 claims abstract description 23
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 346
- 230000009467 reduction Effects 0.000 claims description 98
- 239000000463 material Substances 0.000 claims description 58
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 239000000155 melt Substances 0.000 claims description 31
- 238000006057 reforming reaction Methods 0.000 claims description 25
- 239000007809 chemical reaction catalyst Substances 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 238000002309 gasification Methods 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 8
- 238000010926 purge Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 8
- 238000002156 mixing Methods 0.000 abstract description 3
- 230000001131 transforming effect Effects 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 18
- 239000003546 flue gas Substances 0.000 description 17
- 239000000428 dust Substances 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000003345 natural gas Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- 239000000571 coke Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/22—Increasing the gas reduction potential of recycled exhaust gases by reforming
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a molten iron manufacturing method and a molten iron manufacturing apparatus. More specifically, the present invention relates to a molten iron manufacturing method and a molten iron manufacturing apparatus which can improve the reducing power of the reducing gas by reducing the exhaust gas reforming circulation apparatus of the flow reduction reactor, and reduce the amount of coal used.
- a fluidized bed reduction furnace for reducing iron ore and a melt gasification furnace for melting reduced iron ore are used.
- the coal briquettes in which coal is agglomerated as a heat source for melting the iron ore is charged into the melt gasifier.
- the reduced iron is melted in the molten gasifier, converted to molten iron and slag and discharged to the outside.
- Flue gas discharged from the fluidized-bed reduction furnace is cooled while passing through the collector.
- a flue gas reformer branched flue gas is compressed and removed, and carbon dioxide is removed, and then mixed with the reducing gas discharged from the molten gasifier to supply additional reducing gas to the fluidized bed reduction furnace to reduce iron ore in the fluidized bed reduction furnace.
- additional reducing gas contains a large amount of nitrogen, there is a limit in improving reducing power of the reducing gas.
- the present invention is to provide a method for manufacturing molten iron by improving the reducing power of reduced iron in a reducing furnace by producing a reformed gas using hydrocarbon gas.
- a molten iron manufacturing apparatus that improves the reducing power of the reduced iron in the reduction furnace by producing a reformed gas using a hydrocarbon gas.
- the method for manufacturing molten iron includes the steps of: i) providing exhaust gas discharged from a reduction furnace for converting iron ore into reduced iron, and ii) providing a mixed gas in which another exhaust gas and a hydrocarbon gas are branched from the exhaust gas. Iii) common Reforming the gas to provide the reformed gas; and mixing the reformed gas and the reformed gas discharged from the molten gasifier which is connected to the reduction furnace and receives the reduced iron, and blows the reformed gas into the reduction furnace.
- some reduced iron may be provided directly from the reduction furnace.
- the molten iron manufacturing method according to an embodiment of the present invention further includes the step of compacting the reduced iron, and in the step of providing some reduced iron in the reduced iron as a reforming reaction catalyst, some reduced iron may be provided to be compacted.
- the molten iron manufacturing method according to an embodiment of the present invention may further include recovering some reduced iron used as a reforming reaction catalyst and supplying it to a melt gasifier.
- the reformed gas may be generated in one or more reformers in which some reduced iron is charged, and nitrogen may be supplied to the reformer.
- the mixed gas can be blown in the circumferential direction while rotating annularly inside the reformer.
- some reduced iron is charged to produce a reformed gas in the plurality of reformers used as the reforming reaction catalyst, and the plurality of reformers may include a first reformer and a second reformer. After the charging of some reduced iron to the first reformer is complete, some reduced iron may be charged to the second reformer.
- the inflow of the first reformer of the mixed gas may be blocked, and the mixed gas may be supplied to the second reformer to generate the reformed gas in the second reformer.
- the pressure of the first reformer is greater than or equal to the preset value, the reformed gas can be discharged externally.
- the crab 1 reformer may be purged, the reformed reaction catalyst inside the first reformer may be discharged, and some reduced iron may be fed back to the first reformer.
- some reduced iron may be continuously charged and discharged to the reformer producing the reformed gas, thereby providing the reformed gas.
- Providing the reformed gas comprises: i) providing a plurality of reduced iron charging hoppers connected to the front end of the reformer and a plurality of reduced iron discharge hoppers connected to the rear end of the reformer, ii) a differential pressure between the plurality of reduced iron charging hoppers Adjusting the pressure, Hi) charging some reduced iron through a plurality of reduced iron charging hoppers to a reformer, iv) adjusting a differential pressure between the plurality of reduced iron discharge hoppers, and V) reducing some iron. Passing through a plurality of reduced iron discharge hopper from the reformer may include the step of external discharge.
- the method for manufacturing molten iron according to an embodiment of the present invention may further include i) performing primary heating by indirect contacting the mixed gas with exhaust gas, and ii) heating the mixed gas with oxygen for secondary heating.
- the exhaust gas may be cooled and cleaned.
- the primary heating of the mixed gas may heat the mixed gas to 1000 ° C. or less.
- the secondary heating of the mixed gas may heat the mixed gas to 1100 ° C. to i2 (xrc.
- the reducing furnace may be a layer filling reactor or a plurality of fluidized bed reducing furnaces. When the reduction furnace is a plurality of fluidized-bed reduction reactors, the reducing gas and the reforming gas may be mixed and supplied to each fluidized-bed reduction reactor among the plurality of fluidized-bed reduction reactors.
- the apparatus for manufacturing molten iron includes: i) a reduction furnace for reducing iron ore to reduced iron, and ii) a molten gasification furnace connected with a reduction furnace to produce reduced iron and receiving molten iron and supplying a reducing gas to the reduction furnace, iii) flue gas pipes connected to the reduction furnace and the flue gas discharged from the reduction furnace flows; iv) another flue gas connected to the flue gas pipe branching off the flue gas flows, and is supplied with hydrocarbon gas to provide a mixed gas that is compatible with the flue gas.
- At least one reformer connected to a branch pipe, V) reducing furnace to receive some reduced iron from the reduced iron, and connected to a flue gas branch pipe to reformulate the mixed gas with some reduced iron to provide a reforming gas, vi) a reducing and melting gasifier Supply gas pipes for supplying the reducing gas to the molten gasifier by connecting to the reformer and the supply gas pipes, and mix the reformed gas with the reducing gas. It includes a modified gas pipe provided in the melter-gasifier.
- the apparatus for manufacturing molten iron according to an embodiment of the present invention may further include a heat exchanger connected to the exhaust gas pipe and the exhaust gas branch pipe to heat the mixed gas by the exhaust gas.
- An apparatus for manufacturing molten iron according to an embodiment of the present invention connects a reducing furnace and a molten gasifier, provides a compacted iron compacted to the molten gasifier, and connects a reformer to supply some reduced iron as a compacted compact. It may further comprise a sieve manufacturing apparatus.
- the molten iron manufacturing apparatus i) connecting the compacted material manufacturing apparatus and the reformer, the compacted material supply pipe for supplying the compacted material to the reformer, and ii) compacted material It may further include a compact recovery tube connecting the manufacturing apparatus and the reformer, and return the used compacted compact to the compact manufacturing apparatus.
- the molten iron manufacturing apparatus i) is connected to the heat exchanger and the exhaust gas pipe, the first heater for heating the mixed gas by burning the exhaust gas is supplied, and ii) the first heater is connected to oxygen, oxygen Reheating the mixed gas by receiving may further include two heaters.
- the one or more reformers include a plurality of reformers containing a reforming reaction catalyst, and the plurality of reformers may include a first reformer and a second reformer.
- the apparatus for manufacturing molten iron according to an embodiment of the present invention includes: i) a mixed gas supply pipe interconnecting the heat exchanger and the first reformer and the second reformer, U) a purge gas supply pipe connected to the first reformer and the second reformer, and iii).
- the apparatus may further include an exhaust gas pipe connected to the first reformer and the second reformer.
- the apparatus for manufacturing molten iron includes: i) a pressure gauge installed in the first one reformer and the second reformer and measuring the internal pressure of each of the first and second reformers of the crab, and H) the first one of the reformers. And a differential pressure gauge installed in the second reformer and connected to the upper and mixed gas supply pipes of the crab reformer and the lower 12 reformer, respectively, to measure the difference between the upper pressure and the pressure inside the mixed gas supply pipe, and iii) the first reformer and the first reformer. Installed in the two reformers, may further include a level meter for measuring the height of the reforming reaction catalyst.
- the apparatus for manufacturing molten iron according to an embodiment of the present invention includes: i) a plurality of reduced iron loading hoppers located in front of the reformer and connected in series with the reformer, and ii) a plurality of reduced iron discharged in series with the reformer located at the rear end of the reformer.
- the hopper may further include.
- the apparatus for manufacturing molten iron according to an embodiment of the present invention is installed in at least one hopper among a plurality of reduced iron charging hoppers and a plurality of reduced iron discharge hoppers and blows inert gas into the hopper to pressurize the inside of the hopper. It may further comprise a tube.
- the reformer includes an annular mixed gas supply unit surrounding the center of the reformer, and the mixed gas supply unit is formed with a plurality of openings spaced apart from each other at predetermined intervals, and the mixed gas can be injected into the reformer through the plurality of openings.
- the reduction furnace may be a packed bed reduction furnace or a plurality of fluidized bed reduction furnaces.
- the supply gas pipe may connect the respective fluidized-bed reduction furnace and the melt gasifier of the plurality of fluidized-bed reduction furnaces, respectively.
- the molten iron manufacturing equipment can be used to reduce coal consumption.
- reforming hydrocarbon gas is further supplied to the fluidized-bed reduction furnace, nitrogen accumulation in the reducing gas can be effectively prevented.
- the reduction operation efficiency of iron ore in the fluidized bed reduction furnace can be improved.
- molten iron manufacturing equipment provides additional means for producing molten iron using hydrocarbon gas economically by using both coal and hydrocarbon gas for steelmaking, thus making molten iron more flexible according to fuel conditions and raw material conditions in each region of the world. The process can be chosen.
- FIG. 1 is a schematic diagram of an apparatus for manufacturing molten iron according to a first embodiment of the present invention.
- FIG. 2 is a schematic view of a reformer included in the apparatus for manufacturing molten iron of FIG. 1.
- FIG. 3 is a schematic internal cross-sectional view of the reformer taken along the line II-II of FIG. 2.
- Figure 4 is a graph showing the conversion rate of hydrocarbons to reducing gas over time in contact with the reduced iron.
- FIG. 5 is a view schematically showing a modification of the reformer included in the apparatus for manufacturing molten iron of FIG. 1.
- FIG. 6 is a schematic diagram of an apparatus for manufacturing molten iron according to a second embodiment of the present invention.
- 7 is a schematic view of a molten iron manufacturing apparatus according to a third embodiment of the present invention.
- carbon material refers to a material containing carbon. Therefore, all materials containing carbon, such as coal, coke and carbon dust, are mentioned as carbonaceous material.
- hydrocarbon gas used below is interpreted to mean all the gases containing a hydrocarbon. Therefore, the hydrocarbon gas may be a gas composed only of hydrocarbons, and may be a gas containing hydrocarbons.
- FIG. 1 schematically shows a molten iron manufacturing apparatus 100 according to a first embodiment of the present invention.
- the apparatus for manufacturing molten iron 100 of FIG. 1 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 100 may be modified in other forms.
- the apparatus for manufacturing molten iron 100 includes a fluidized bed reduction furnace 10, a compacted material manufacturing apparatus 20, a melt gasifier 30, a reformer 40, a heat exchanger 50, and heating. Furnaces (60, 62).
- the apparatus for manufacturing molten iron 100 may further include other apparatuses as necessary. Detailed internal structure of each of these devices can be easily understood by those skilled in the art will not be described in detail.
- molten iron is produced.
- Oxygen is blown through the tuyere 301 of the melting gasifier 30, and coal and reduced iron are passed through the upper portion of the melting gasifier 30.
- Coal forms a coal packed bed in the melting gasifier 30.
- Coal coal and a lump coal material can be used as coal, and lump coal can be used as a lump coal material.
- the combustion heat generated by burning coal charged into the melting gasifier 30 by using the oxygen blown through the tuyere 301 is used for the production of molten iron.
- high-temperature reducing gas, such as CO and 3 ⁇ 4 is passed to the dome part of the molten gasifier 30 through the layered layer formed in the molten gasifier 30.
- the reduced silver gas is discharged from the molten gasifier 30 and passes through the dust circulation device 32.
- the dust circulation device 32 separates a large amount of carbon-containing dust contained in the hot reducing gas, and re-injects the separated carbon-containing dust into the melt gasification furnace 30.
- the reducing gas from which a large amount of carbon-containing dust has been removed is supplied to the fluidized-bed reduction reactor 10.
- the collector device 36 branches off a portion of the gas separated from the carbon-containing dust in the dust circulation device 32 to cool and clean it. And the gas circulation cooling apparatus 37 further wash
- the gas is boosted and circulated to the reducing gas supplied from the molten gasifier 30 to control the temperature of the reducing gas supplied to the fluidized bed reduction furnace 10.
- the excess gas discharge device 38 further dedusts a part of the angled and damped gas in the collecting device 36 in accordance with the pressure of the melt gasifier 30 in order to adjust the internal pressure of the melt gasifier 30. And then to the outside.
- the fluidized-bed reduction reactor 10 In the fluidized bed reduction furnace 10, iron ore is reduced.
- the fluidized-bed reduction reactor 10 consists of multiple stages and is sequentially connected to reduce spectroscopy and convert to reduced iron.
- a bubble fluidized bed In each fluidized-bed reduction reactor 10, a bubble fluidized bed is formed. Therefore, it is possible to produce reduced iron by reducing the spectroscopic flow in the fluidized-bed reduction reactor (10).
- the sub-materials can be further mixed with the spectroscopy so that the spectroscopy does not stick inside the fluidized-bed reduction furnace 10.
- the compacted material producing apparatus 20 includes a reduced iron storage tank 201, a pair of rolls 203, a crusher 205 and a distribution chute 207.
- the compacted material manufacturing apparatus 20 may further contain other components as needed.
- the reduced iron storage tank 201 temporarily stores the reduced iron supplied from the fluidized-bed reduction reactor 10.
- a pair of s are supplied with reduced iron from ( 2 03) and compressed to produce a compacted body.
- the crusher 205 is pressed
- the compacted material is broken into a predetermined size.
- the distribution chute 207 properly distributes the compacted material in a plurality of compacted material storage tanks (not shown).
- the high temperature uniform back pressure device 34 is located between the compacted body production device 20 and the melt gasifier 30.
- the high temperature uniform back pressure device 34 is installed above the melt gasifier 30 for pressure control. Since the inside of the melt gasifier 30 is a high pressure, the high temperature uniform back pressure device 34 can adjust the pressure uniformly, and can easily load a compacted material into the melt gasifier 30. Therefore, the compacted material is properly supplied to the molten gasifier 30 while being supplied through the high temperature homogenizing device 34.
- the supply gas pipe 70 supplies the reducing gas discharged from the coal seam bed of the melt gasifier 10 to the fluidized bed reduction furnace 10. Therefore, iron ore may be converted into reduced iron in the fluidized-bed reduction furnace 10 by the supply gas provided through the supply gas pipe 70.
- the exhaust gas discharged from the fluidized-bed reduction reactor 10 passes through a heat exchanger 50, and has a heat recovery function for recovering sensible heat of the exhaust gas in the heat exchanger 50.
- the dry dust collector 80 is located at the rear end of the heat exchanger 50 to separate and remove dust contained in the exhaust gas.
- the water receiving device 82 is located at the rear end of the dry dust collecting device 80 to cool the exhaust gas.
- the exhaust gas branch pipe 92 branches and transports a part of the exhaust gas at the rear end of the water receiving device 82.
- the compressor 84 compresses the branched flue gas.
- the hydrocarbon gas supply pipe 86 is connected to the exhaust gas branch pipe 92 at the rear end of the compressor 84 to provide a mixed gas in which the hydrocarbon gas is mixed with the hydrocarbon gas.
- the mixed gas is heated while passing through the heat exchanger 50 and then supplied to the first heater 60 through the mixed gas pipe 94.
- the fuel gas pipe 94 branches from the exhaust gas pipe 90 and is connected to the first heater 60 to supply the exhaust gas as fuel to heat the mixed gas.
- air is supplied to the first heater 60 for combustion.
- the first heater 60 it is possible to adjust the temperature of the heunhap gas below 1000 ° C. If the temperature of the mixed gas is too high, the heat-resistant metal heating temperature riser included in the crab 1 heater 60 may be damaged above the temperature. Therefore, the temperature of the mixed gas is adjusted to the above range.
- the second heater 62 is located at the rear end of the first heater 60.
- oxygen is introduced into the mixed gas heated by the crab 1 heater 60. Blowing causes partial combustion of the mixed gas.
- the mixed gas is secondly heated, and the temperature is adjusted to 1100 ° C. to 1200 ° C. If the secondary heating temperature is too high, compacted material in contact with the mixed gas may stick inside the reformer 40. Also, if the secondary heating temperature is too low, there is no meaning of secondary heating. Therefore, the secondary heating temperature of the mixed gas is adjusted to the above-mentioned range.
- the mixed gas further heated in the first heater 60 and the second heater 62 is supplied to the reformer 40 through a mixed gas pipe 93 connected to the reformer 40.
- the reformer 40 receives a high temperature mixed gas and reforms the C0 2 / H 2 0 component in the hydrocarbon and exhaust gas contained in the mixed gas into a reducing gas component such as CO / H 2 .
- the reformed gas treated in the reformer 40 is mixed with the coal-based reducing gas generated in the melt gasifier 30 through the reformed gas pipe 94 connected to the rear end of the dust circulating device 32 to the fluidized bed reduction furnace 10. Is provided.
- the reformer 40 is connected to the compacted material producing apparatus 20 through the compacted material supply pipe 22 and the compacted material recovery pipe 24.
- the compacted material supply pipe 22 provides the compacted material manufactured by the compacted material manufacturing apparatus 20 to the reformer 40.
- FIG. The compacted material recovery tube 24 returns another compacted material which has been used as the reforming reaction catalyst in the reformer 40 to the compacted material manufacturing apparatus 20 and supplies it to the melt gasifier 30.
- some of the reduced iron discharged from the fluidized-bed reduction reactor 10 may be directly provided to the reformer 40.
- the high-temperature exhaust gas discharged after reducing the iron ore in the fluidized-bed reduction furnace 10 passes through the heat exchanger 50, and removes and removes the dust contained therein in the dry dust collector 80, and then the water cooling device ( 82) to room temperature.
- Some of the vibration damping and angled flow flue gas is branched and boosted by the compressor 84 and then mixed with the hydrocarbon gas to provide it as a mixed gas.
- the mixed gas is heated in contact with the exhaust gas in the heat exchanger 50, and then flows into the first heating furnace 60 to indirectly contact with the mercury gas generated by burning the exhaust gas from the dust removal and angled flow.
- the mixed gas having passed through the first heating furnace 60 is secondarily heated in the crab 2 heating furnace 62.
- the mixed gas is heated by the combustion heat by directly injecting oxygen into the mixed gas and burning it.
- the temperature of the mixed gas is adjusted in the reformer 40 so as to correspond to the semicolumn heat necessary for converting the mixed gas into the reducing gas and the sensible heat required to secure the converted reducing gas temperature.
- the mixed gas heated in the crab 2 heater 62 is converted into a reducing gas such as CO and H 2 by the chemical reaction of the following Chemical Formula 1 in the reformer 40.
- Reduced iron is used as a catalyst to promote the reaction as described above in order to increase the rate and reaction rate of the reforming reaction.
- the compacted material producing apparatus 20 is connected with the reformer 40 to supply compacted material, which is reduced iron, to the reformer 40, and receives used iron from the reformer 40. That is, the compacted material producing apparatus 20 is connected to the reformer 40 through the compacted material supply pipe 22 and the compacted material recovery pipe 24.
- the reformed gas generated in the reformer 40 by the reduced iron is transported through the reformed gas pipe 94 and connected to the supply gas pipe 70 through which the reduced gas discharged from the molten gas furnace 30 flows. Is supplied.
- FIG. 2 schematically shows a reformer 40 included in the apparatus for manufacturing molten iron 100 of FIG.
- the structure of the reformer 40 of FIG. 2 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the structure of the reformer 40 can be modified in other forms.
- the reformer 40 may be installed in a form including a plurality of units.
- the reformer 40 includes a first reformer 401 and a second reformer 403.
- the first reformer 401 and the second reformer 403 have the same structure. Thus, either reformer may be used in the increase U reformer 401 and the second reformer 403, and the other reformer may be left in a reserve state. And if either reformer is maintained or breakdown occurs, it can be switched to another reformer. As described above, a plurality of valves are used to shut off or open the gas conduits for alternating use of the first reformer 401 and the second reformer 403.
- the compacted material supply pipe 22 is connected to the distribution chute 23 located at the top of the reformer 14 to supply reduced iron through the distribution chute 23.
- the reduced iron is selectively supplied to either the crab 1 reformer 401 or the crab 2 reformer 403 through the distribution chute 23.
- the reduced iron supplied to either of the first reformer 401 and the crab 2 reformer 403 acts as a reforming reaction catalyst.
- the reduced iron used as the reforming reaction catalyst is returned to the compacted material producing apparatus 20 through the compacted material recovery tube 24.
- the used compacted material can be cut out of the crab reformer 401 and the second reformer 403 using a screw feeder or the like.
- valves 231 and 233 when the valves 231 and 233 are closed, the first reformer 401 and the second reformer 403 are gas-tight without gas leaking from the crab 1 reformer 401 and the low 12 reformer 403. .
- the valves 231, 233 are opened and closed to supply reduced iron to the crab 1 reformer 401 or the crab 2 reformer 403.
- the valves 241 and 243 when the valves 241 and 243 are closed, the gas reformer 401 and the crab reformer 403 are gas-tight without gas leaking from the crab reformer 401 and the second reformer 403. do.
- the valves 241 and 243 are opened and closed to control the amount of reduced iron discharged from the first reformer 401 and the crab 2 reformer 403 through the compacted material recovery tube 24.
- the mixed gas is selectively supplied to the first reformer 401 and the second reformer 403 through the mixed gas pipe 93.
- the valves 931 and 933 regulate the mixed gas to be selectively supplied to the crab 1 reformer 401 or the bare 12 reformer 403, respectively.
- the mixed gas is converted into reformed gas in the first reformer 401 or the crab reformer 403, and then discharged to the outside through the reformed gas pipe 9 4 .
- the valves 941 and 943 are respectively installed in the reforming gas pipe 94 in the rear end directions of the first reformer 401 and the second reformer 403 to adjust the amount of reformed gas discharged to the outside.
- the crab 1 reformer 401 and the second reformer 403 are provided with exhaust gas pipes 47 and 48 to externally discharge the internal gas as necessary, and the valves 471 and 481 in the exhaust gas pipes 47 and 48. ) Is installed. Meanwhile, nitrogen supply pipes 405 and 407 are installed in the first reformer 401 and the second reformer 403 to supply nitrogen when the first reformer 401 or the second reformer 403 is purged.
- the pressure gauges 41 and 42 are respectively installed in the first reformer 401 and the second reformer 403 to measure the internal pressures of the first reformer 401 and the second reformer 403. Internal pressures of the first reformer 401 and the second reformer 403 may be monitored by measuring the internal pressures of the first reformer 401 and the second reformer 403.
- the differential pressure gauges 43 and 44 are installed in the crab 1 reformer 401 and the second reformer 403 to measure the differential pressure due to the gas flow formed in the first reformer 401 and the second reformer 403.
- the aeration resistance through the reduced iron can be measured from the differential pressure to determine whether the reduced iron operates smoothly as a reforming reaction catalyst.
- the rebelgye (45, 46) are installed on to first reformer 401 and the second reformer 403, it is possible to measure the height of the reduced iron charged formed in the first reformer 401 and the second reformer 403 .
- FIG. 3 schematically shows the internal cross-sectional structure of the reformer 403 cut along the line II- ⁇ of FIG. 2.
- the internal structure of the reformer 403 of FIG. 3 is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, the internal structure of the reformer 403 can be modified in other forms.
- a plurality of openings 4035 are formed in the mixed gas supply portion 4033 of the reformer 403 to be connected to the inside at regular intervals in the circumferential direction and spaced apart from each other at predetermined intervals. . Therefore, the mixed gas is introduced into the reformer 403 through the mixed gas inlet 4031 as shown by the arrow and then rotates along the annular mixed gas supply portion 4033.
- the mixed gas inlet 4031 is formed in a pair facing each other.
- the mixed gas is constantly blown into the reformer 403 in the circumferential direction while rotating annularly toward the reformer center 403c through the plurality of openings 4035. As a result, the mixed gas can be efficiently reformed using a reforming reaction catalyst.
- the distribution chute 23 changes the charging direction of the reduced iron in the 1st reformer 401 (FIG.
- the valve 231 shown in FIG. 2 is opened so that the reduced iron is charged into the first reformer 401 through the compacted material supply pipe 22.
- the distribution chute 23 determines the charging direction of the reduced iron in the second reformer 403. It changes to (shown in FIG. 2 and the same below).
- valve 231 is closed, and the talb 233 (shown in FIG. 2) is opened to charge the reduced iron into the second reformer 403. And when the level meter 46 (shown in FIG. 2) is detected that the height of the packed bed generated by reduced iron within the second reformer 403 has reached a preset value, the valve 233 (shown in FIG. 2) Is closed, and the transfer of reduced iron through the compacted material supply pipe 22 is stopped.
- valve 931 (shown in FIG. 2) is opened so that the mixed gas flowing through the mixed gas pipe 93 (shown in FIG. 2, hereinafter same) is mixed gas inlet 4031 (shown in FIG. 3, the same below).
- the valve 941 is opened to discharge the reformed gas through the reformed gas pipe 94. Let's do it.
- the reformed gas is promoted by the catalytic action of the reduced iron in the mixed gas uniformly supplied into the first reformer 401 and contains a large amount of CO and 3 ⁇ 4 according to Chemical Formula 1 described above.
- the first reformer 401 as the chemical reaction of Chemical Formula 1 described above proceeds, the reduced iron, which is a compact, is worn or the carbon component is precipitated by the chemical reaction of Chemical Formula 2 below.
- the porosity of the reduced iron filling layer formed in the first reformer 401 may be lowered, resulting in uneven gas flow formed in the first reformer 401.
- the reaction coefficient of the above-described formula (1) can be lowered.
- This phenomenon can be sensed by the differential pressure gauge 43, so that when the differential pressure measured by the differential pressure gauge 43 is higher than or equal to the preset value, the valves 931 and 941 (shown in FIG. 2, hereinafter same) will be closed. It is possible to supply the mixed gas to the second reformer 403 by opening the valve 933 while interrupting the supply of the mixed gas to the 401. As a result, the operation of the first reformer 401 can be similarly implemented in the second reformer 403.
- the first reformer 401 is opened by opening the valve 471 (shown in FIG. 2) of the exhaust gas pipe 47 (shown in FIG. 2) connected to the first reformer 401. ) Exhaust the gas inside.
- the pressure gauge 41 confirms that the pressure inside the first reformer 401 has fallen below the preset value due to the gas discharge, the nitrogen supply pipe 405 (shown in FIG. 2) connected to the lower portion of the first reformer 401.
- the inside of the first reformer 401 is injected with nitrogen, and the residual mixed gas is purged.
- the reduced iron in the first reformer 401 is discharged by opening the valve 241 of the first reformer 401.
- the discharged reduced iron is recovered by the compacted rare water pipe 24 and charged into the melt gasifier 30 together with the compacted body produced in the compacted body manufacturing apparatus 10.
- the reduced iron is reloaded into the first reformer 401 after the nitrogen supply is stopped.
- the valves 933 and 943 are closed so that the second reformer The mixed gas supplied to the 403 is shut off, and the valve 931 is opened to supply the mixed gas to the first reformer 401 to supply the mixed gas to the crab reformer 401.
- the reformed gas can be produced in the first reformer 401 and the used compacted material is discharged from the second reformer 403.
- the first reformer 401 and the second reformer 403 included in the reformer 40 may cross-operate with each other.
- the reaction of the above-mentioned formula (1) can be carried out under favorable catalyst conditions by performing the step of converting the mixed gas into the reformed gas using reduced iron.
- Figure 4 shows the conversion rate of hydrocarbon to reducing gas over time in contact with the reduced iron.
- the hydrocarbon is converted into the reducing gas by the above Chemical Formula 1 as the time for the hydrocarbon to contact iron is reduced.
- the amount of the carbon component generated by the above-described formula (2) or the like exceeds a predetermined level or more. Therefore, the conversion efficiency of the hydrocarbon according to Formula 1 is lowered to 70% or less. Therefore, in order to increase the conversion efficiency of the hydrocarbon again, the reduced iron in the reformer 40 as shown in the reformer 40 (shown in FIG. It is preferable to substitute with fresh reduced iron.
- FIG. 5 is a modification of the reformer 40 included in the molten iron manufacturing apparatus 100 of FIG. Shown schematically.
- the structure of the reformer 49 of FIG. 5 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the structure of the reformer 49 can be modified into other forms.
- the structure of the reformer 49 of FIG. 5 is similar to that of the reformer 40 of FIG. 2, the same reference numerals are used for the same parts, and detailed description thereof is omitted.
- the reduced iron is charged to the upper portion thereof along the gravity direction and discharged to the lower portion thereof, and the mixed gas is a countercurrent type gas supplied to the reformer 49 in the opposite direction of gravity.
- a compacted feed pipe 22 reduced iron charging hoppers 491 and 493 and valves 4910 and 4911 connected in series to pass the reduced iron are positioned and connected to the reformer 48.
- the valve 4910 is positioned between the reduced iron charging hoppers 491 and 493 to adjust the differential pressure between the reduced iron charging hoppers 491 and 493, the valve 491 1 is reduced iron charging hopper (493).
- a reformer 49 is positioned between the reduced iron charging hoppers 491 and 493 to adjust the differential pressure between the reduced iron charging hoppers 491 and 493, the valve 491 1 is reduced iron charging hopper (493).
- a reformer 49 is positioned between the reduced iron charging hoppers 491 and 493 to adjust the differential pressure between the reduced iron charging hoppers 491 and 493.
- the reduced iron charging hopper 491 is supplied with reduced iron from the compacted material supply pipe 22 to charge the reduced iron into the reforming furnace 49 maintained at a higher pressure than atmospheric pressure.
- the reduced iron charging hopper 493 uniformly regulates the pressure between the reduced iron charging hopper 491 and the reformer 48 so that the compacted body can be smoothly charged into the reformer 49.
- Valves 4910 and 491 1 may seal off the gas in order to efficiently charge reduced iron into reformer 48.
- the upper level gauges 4926 and 4928 and the lower level gauges 4927 and 4929 are respectively installed in the reduced iron charging hoppers 491 and 493 to reduce the level of the reduced iron accumulated in the reduced iron charging hoppers 491 and 493.
- Measure The reformer 49 is also provided with a level meter 4916 for continuously measuring the height of the reduced iron stacked therein.
- the reduced iron discharge hoppers 495 and 497 and the valves 4917 and 4918 connected in series so as to discharge the reduced iron are positioned so that the reformer 49 and Connected.
- the valve 4917 is located between the reformer 49 and the reduced iron charging hopper 495
- the valve 4918 is positioned between the reduced iron charging hoppers 495 and 497 so that the reduced iron charging hoppers 495, 497) Adjust the differential pressure between them.
- the reduced iron discharge hopper 495 discharges reduced iron at atmospheric pressure from the reforming furnace 49 maintained at a higher pressure than atmospheric pressure.
- the reduced iron discharge hopper 497 uniformly adjusts the pressure between the reformer 49 and the reduced iron discharge hopper 495 to reduce the reduced iron from the reformer 49. Discharge smoothly.
- the valves 4917 and 4918 may seal off the gas in order to efficiently discharge the reduced iron from the reformer 49.
- an upper level gauge 4930 and a lower level gauge 4831 are provided in the reduced iron discharge hopper 495, and an upper level 4932 is provided in the reduced iron discharge hopper 497. Therefore, the height of the reduced iron accumulated in the reduced iron discharge hoppers (495, 497) is measured.
- the reduced iron charging hopper 493 is provided with a back pressure line 4912, a pressurization line 4914, valves 4913 and 4915, and a differential pressure gauge 4825.
- the back pressure line 4912 controls the valve 4913 to discharge the gas inside the reduced iron charging hopper 493 to lower the pressure of the C reduced iron charging hopper 493.
- the pressurization line 4914 uses the valve 4915 to inject an inert gas such as nitrogen into the reduced iron charging hopper 493 to pressurize it.
- the pressure difference with the reforming furnace 49 is measured using the differential pressure gauge 125.
- Back pressure line 4919, pressure line 4921, valves 4920 and 4922, and differential pressure gauge 4940 are also installed in the reduced iron discharge hopper 495 to perform the same function.
- a pressure equalizing line 4950 and a valve 4951 are installed between the reduced iron discharge hopper 495 and the lower portion of the reformer 49.
- a reformed gas pipe 94 is provided with a gas analyzer 4413 to monitor the composition of the reformed gas discharged from the reformer 49.
- the reduced iron transferred through the compacted material supply pipe 22 is charged into a reduced iron charging hopper 491. And if it is detected by the upper level meter 4926 that the reduced iron is filled up to the upper level meter 4926 of the reduced iron charging hopper 491, the supply of reduced iron through the compacted material supply pipe 22 is stopped. If the reduced iron is lowered below the upper level meter 4926 by the upper level gauge 4926, that is, if the reduced iron charging hopper 491 is empty, the reduced iron is supplied again through the compacted material supply pipe 22, and the upper If it is detected that the reduced iron is filled up to the level meter 4926, the reduced iron supply is stopped.
- the valve 491313 is opened to allow back pressure of the reduced iron charging hopper 493 through the back pressure line 4912.
- the valve 4910 It is opened and charged iron begins to be charged from the reduced iron charging hopper 491 to the reduced iron charging hopper 493.
- the valve 4910 is closed to stop the reduced iron charging, and the valve 4913 is closed.
- the valve 4915 is opened to pressurize the reduced iron charging hopper 493 by injecting an inert gas into the reduced iron charging hopper 493 through the pressure line 4914.
- the valve 4915 is closed to stop the pressurization of the reduced iron charging hopper 493.
- the valve 491 1 is opened to charge the reduced iron from the hopper 493 for reducing iron charging to the reformer 49.
- the valve 4911 is closed. This charging process continues until the level iron 45 fills the reformer 49 with the reduced iron above a certain height.
- valve 935 When the compacted material is filled in the reformer 49, the valve 935 is opened to supply the mixed gas to the reformer 49 through the mixed gas pipe 93 to be reformed.
- the reformed gas generated in the reformer 49 is discharged to the outside through the reformed gas pipe 94 by opening the valve 941.
- the reduced iron is discharged to the reformer 49 at a predetermined time interval and the reduced iron is charged back into the reformer 49.
- the reduced iron is discharged from the reformer 49 through the following process.
- the valve 4922 is opened, and an inert gas is injected into the hopper 495 for reducing iron discharge through the pressure line 4921.
- the valve 4922 is closed to inert gas injection. Do this.
- the valve 4917 is opened to transfer the used reduced iron from the reformer 49 to the reduced iron discharge hopper 495.
- the reduced iron is smoothly maintained by opening the valve 4951 and maintaining a uniform pressure between the reduced iron discharge hopper 495 and the reformer 49 while the reduced iron is charged from the reformer 49 to the reduced iron discharge hopper 495. Discharge.
- the reduced iron is filled in the hopper 495 for reducing iron discharge by the upper level gauge 4940. If confirmed, the valve 4917 is closed to stop the reduced iron charging, and the valve 4951 is closed. Next, the valve 4920 is opened to back-pressure the reduced iron discharge hopper 495 through the back pressure line 4919. Then, it is confirmed by the pressure gauge 4940 that the pressure in the reduced iron discharge hopper 495 is backed up to normal pressure, and the reduced iron in the reduced iron discharge hopper 497 is emptied to the level gauge 4932 or less by the level gauge 4932. If confirmed, the valve 4918 is opened to discharge the reduced iron to the reduced iron discharge hopper 497.
- FIG. 6 schematically shows a molten iron manufacturing apparatus 200 according to a second embodiment of the present invention.
- the apparatus for manufacturing molten iron 200 of FIG. 6 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 200 may be modified in other forms. Meanwhile, since the structure of the apparatus for manufacturing molten iron 200 of FIG. 6 is similar to that of the apparatus for manufacturing molten iron 100 of FIG. 1, the same reference numerals are used for the same parts, and detailed description thereof will be omitted.
- the reducing gas discharged from the melt gasifier 10 and the reformed gas discharged from the reformer 40 are discharged from each of the plurality of fluidized-bed reduction reactors 10 to the fluidized-bed reduction reactor 10. That is, they are supplied separately and separately. That is, the plurality of fluidized-bed reduction furnaces 10 each have somewhat different functions for converting iron ore into reduced iron according to preheating, heating, final heating and the like. Therefore, the function of the fluidized-bed reduction reactor 10 in each step by mixing the reducing gas discharged from the melt gasifier 10 and the reformed gas discharged from the reformer 40 and supplying them to each fluidized-bed reduction reactor 10. Can be improved in more detail.
- FIG. 7 schematically shows a molten iron manufacturing apparatus 300 according to the third embodiment of the present invention.
- the structure of the apparatus for manufacturing molten iron 300 of FIG. 7 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the structure of the apparatus for manufacturing molten iron 300 may be modified in other forms.
- the structure of the apparatus for manufacturing molten iron 300 of FIG. 7 is similar to that of the apparatus for manufacturing molten iron 100 of FIG. 1, the same reference numerals are used for the same parts, and a detailed description thereof will be omitted.
- the layered layer reduction furnace 12 can be used as a reduction furnace.
- iron ore may be charged into the layered layer reduction furnace 12 to form a layered layer to produce molten iron in the melt gasification furnace 30.
- the molten gasification furnace 30 in the packed layer reduction furnace 12 may be used.
- Some of the reduced iron supplied to the reformer 40 may be supplied to the reformer 40 to be used as a reforming reaction catalyst, and the used reforming reaction catalyst may be charged into the melt gasifier 30 to produce molten iron.
- the exhaust gas was compressed and removed from the carbon dioxide for circulation and reformation of the exhaust gas, and the amount of energy required for this process is known to be very large.
- the cost of the exhaust gas reforming circulation compared to the coal price reduced by the aforementioned method is high in the region where the power unit cost is high, and thus economic efficiency may be lost.
- the nitrogen gas mixed in the reducing gas is not separated and removed during the circulation and reforming of the exhaust gas in order to prevent local burning and powder clogging in the melt gasification furnace and the flow path during molten iron manufacturing.
- nitrogen gas which is an inert gas, remains and accumulates in the reducing gas, thereby reducing the quality of the reducing gas supplied to the reduction furnace. Therefore, not only reduces the coal consumption reduction effect by reforming the exhaust gas, but also increases the energy required to reform the exhaust gas, that is, remove carbon dioxide, and lowers the carbon dioxide removal efficiency.
- the supply amount of the reducing gas supplied by reforming the exhaust gas should be limited to a predetermined level or less, thereby reducing the effect of reducing the coal requirement in the melt gasification furnace.
- the reduction in coal demand is attributable to a decrease in the reserves of coal used in the manufacture of molten iron and to higher prices as global coal demand increases.
- a raw material that can replace coal is, for example, natural gas mainly containing hydrocarbons. Natural gas fields are being actively developed, and the price of natural gas is expected to stabilize downward in the long term due to increased shale gas mining in North America.
- a method of blowing natural gas through a tuyere into which an oxidant is injected is used to burn coke or coal in a blast furnace or a melt gasifier.
- hydrocarbons are reformed into reducing gas by the combustion heat of coke or coal, which is fed to the fluidized bed reduction furnace connected to the upper part of the blast furnace and the molten gasifier together with the reducing gas generated by the combustion of coke or coal.
- the heat generated from the combustion of coke or coal is around the blast furnace and melt gasifier, which is less than the heat required to operate the blast furnace and melt gasifier. Therefore, there is a limit in reducing the consumption of coke or coal by natural gas injection.
- the hydrocarbon is mixed with the exhaust gas of the reduction furnace and used.
- the consumption of coal required for the production of molten iron used while increasing the reducing power of the reducing gas is reduced.
- the mixed gas was heated up using oxygen of 5,061 Nm 3 / hr.
- Fluidized Bed Reduction Furnace Subsidiary materials were charged at 308 ton / hr, and reduced iron was prepared as a compact using a compaction apparatus, and then charged to a melt gasifier with a flux of 22 ton / hr at 232 ton / hr. Coal was charged to the melt gasifier at 1 17 ton / hr. As a result, 180 ton / hr of molten iron was produced in a melt gasifier.
- the exhaust gas is reformed by reforming the exhaust gas with a reformer such as simply removing carbon dioxide from the exhaust gas discharged from the fluidized-bed reduction reactor, and the feed gas suitable for the reducing gas produced in the molten gas-fired furnace is transferred to the fluidized-bed reduction reactor.
- a reformer such as simply removing carbon dioxide from the exhaust gas discharged from the fluidized-bed reduction reactor
- the feed gas suitable for the reducing gas produced in the molten gas-fired furnace is transferred to the fluidized-bed reduction reactor.
- Table 1 shows the physical properties of the reducing gas, the reforming gas and the supply gas of the above-described experimental example and the supply gas of the comparative example.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2016007469A MX2016007469A (es) | 2013-12-10 | 2013-12-24 | Metodo para la manufactura de hierro fundido y aparato para la manufactura de hierro fundido. |
EP13898893.6A EP3081654B1 (en) | 2013-12-10 | 2013-12-24 | Molten iron manufacturing method and molten iron manufacturing apparatus |
CN201380081480.2A CN105814215B (zh) | 2013-12-10 | 2013-12-24 | 铁水制造方法及铁水制造设备 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2013-0153268 | 2013-12-10 | ||
KR1020130153268A KR101550893B1 (ko) | 2013-12-10 | 2013-12-10 | 용철제조방법 및 용철제조장치 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015088092A1 true WO2015088092A1 (ko) | 2015-06-18 |
Family
ID=53371378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2013/012113 WO2015088092A1 (ko) | 2013-12-10 | 2013-12-24 | 용철제조방법 및 용철제조장치 |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3081654B1 (ko) |
KR (1) | KR101550893B1 (ko) |
CN (1) | CN105814215B (ko) |
MX (1) | MX2016007469A (ko) |
WO (1) | WO2015088092A1 (ko) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3348654A4 (en) * | 2015-09-08 | 2018-07-18 | Posco | Apparatus for decomposing tar, apparatus for producing molten iron, and method for producing molten iron |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102513315B1 (ko) | 2015-12-24 | 2023-03-22 | 주식회사 포스코 | 용철 제조 장치 |
KR102091122B1 (ko) * | 2017-11-30 | 2020-03-19 | 주식회사 포스코 | 용철 제조 장치 및 용철 제조 방법 |
KR102089495B1 (ko) * | 2017-12-22 | 2020-04-28 | 주식회사 포스코 | 용철 제조 장치 |
KR20240018205A (ko) * | 2022-08-02 | 2024-02-13 | 주식회사 포스코 | 용철 제조 설비 및 용철 제조 방법 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0627285B2 (ja) * | 1985-05-13 | 1994-04-13 | ホエスト―アルピン・インダストリーアンラーゲンバウ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | 酸化鉄を含む粒状物質の直接還元方法 |
JPH0788525B2 (ja) * | 1989-12-22 | 1995-09-27 | シー.ブイ.ジー.シデルルジカ デル オリノコ シー.エー. | 鉄を含有する金属酸化物の直接還元方法 |
EP1689892A1 (en) | 2003-12-05 | 2006-08-16 | Posco | An apparatus for manufacturing a molten iron directly using fine or lump coals and fine iron ores, the method thereof, the integrated steel mill using the same and the method thereof |
KR20100132005A (ko) * | 2008-02-15 | 2010-12-16 | 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 | 탄화수소를 첨가함으로써 고로 가스를 재순환시키면서 원료 철을 용융시키는 방법 |
KR20120038017A (ko) * | 2009-07-31 | 2012-04-20 | 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 | 개질기용 연소 가스로서 이용되는 폐 가스 성분의 탈탄소화 및 폐 환원 가스의 회수를 이용한 개질된 가스-기반의 환원 방법 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5912400A (en) | 1997-12-02 | 1999-06-15 | Brifer International Ltd. | Method for reforming reducing gas in a fluidized bed process for reduction of ore |
WO2008078891A1 (en) * | 2006-12-22 | 2008-07-03 | Posco | Apparatus and method for manufacturing molten iron |
SE532975C2 (sv) * | 2008-10-06 | 2010-06-01 | Luossavaara Kiirunavaara Ab | Förfarande för produktion av direktreducerat järn |
KR101187851B1 (ko) * | 2010-11-19 | 2012-10-04 | 주식회사 포스코 | 용철제조장치 및 이를 이용한 용철제조방법 |
CN102010924B (zh) * | 2010-12-31 | 2012-09-05 | 中冶赛迪上海工程技术有限公司 | 一种用煤生产直接还原铁的方法 |
CN102268504B (zh) * | 2011-08-19 | 2013-02-27 | 中冶赛迪工程技术股份有限公司 | 一种焦炉煤气生产海绵铁的直接还原工艺 |
-
2013
- 2013-12-10 KR KR1020130153268A patent/KR101550893B1/ko active IP Right Grant
- 2013-12-24 EP EP13898893.6A patent/EP3081654B1/en active Active
- 2013-12-24 WO PCT/KR2013/012113 patent/WO2015088092A1/ko active Application Filing
- 2013-12-24 MX MX2016007469A patent/MX2016007469A/es unknown
- 2013-12-24 CN CN201380081480.2A patent/CN105814215B/zh active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0627285B2 (ja) * | 1985-05-13 | 1994-04-13 | ホエスト―アルピン・インダストリーアンラーゲンバウ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | 酸化鉄を含む粒状物質の直接還元方法 |
JPH0788525B2 (ja) * | 1989-12-22 | 1995-09-27 | シー.ブイ.ジー.シデルルジカ デル オリノコ シー.エー. | 鉄を含有する金属酸化物の直接還元方法 |
EP1689892A1 (en) | 2003-12-05 | 2006-08-16 | Posco | An apparatus for manufacturing a molten iron directly using fine or lump coals and fine iron ores, the method thereof, the integrated steel mill using the same and the method thereof |
KR20100132005A (ko) * | 2008-02-15 | 2010-12-16 | 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 | 탄화수소를 첨가함으로써 고로 가스를 재순환시키면서 원료 철을 용융시키는 방법 |
KR20120038017A (ko) * | 2009-07-31 | 2012-04-20 | 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 | 개질기용 연소 가스로서 이용되는 폐 가스 성분의 탈탄소화 및 폐 환원 가스의 회수를 이용한 개질된 가스-기반의 환원 방법 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3348654A4 (en) * | 2015-09-08 | 2018-07-18 | Posco | Apparatus for decomposing tar, apparatus for producing molten iron, and method for producing molten iron |
Also Published As
Publication number | Publication date |
---|---|
MX2016007469A (es) | 2016-10-13 |
CN105814215A (zh) | 2016-07-27 |
KR20150067610A (ko) | 2015-06-18 |
EP3081654B1 (en) | 2018-10-03 |
EP3081654A4 (en) | 2017-01-04 |
CN105814215B (zh) | 2018-11-27 |
KR101550893B1 (ko) | 2015-09-18 |
EP3081654A1 (en) | 2016-10-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5807786B2 (ja) | 鉄、セミスチールおよび還元ガスを生産する装置と方法 | |
KR100930680B1 (ko) | 용철제조장치 및 용철제조방법 | |
US8545597B2 (en) | Method for operating a blast furnace and blast furnace installation | |
JP5465777B2 (ja) | 使用済みガスから二酸化炭素を分離するための方法及び装置 | |
KR101550893B1 (ko) | 용철제조방법 및 용철제조장치 | |
KR20230006894A (ko) | 침탄된 해면철을 제조하는 방법 | |
CN101448962B (zh) | 通过注入含烃气体制造铁水的方法和使用该方法制造铁水的设备 | |
CA3004666A1 (en) | Method for producing liquid pig iron | |
KR101607254B1 (ko) | 복합 용철 제조 장치 | |
KR100829808B1 (ko) | 용철제조장치 및 용철제조방법 | |
KR101607253B1 (ko) | 복합 용철 제조 장치 | |
JP2023550359A (ja) | 浸炭海綿鉄を生成するプロセス | |
KR102091122B1 (ko) | 용철 제조 장치 및 용철 제조 방법 | |
US20050151307A1 (en) | Method and apparatus for producing molten iron | |
WO2023162389A1 (ja) | 粉鉄鉱石の還元方法 | |
KR101481126B1 (ko) | 용철 제조장치 | |
US20120031236A1 (en) | Method and installation for producing direct reduced iron | |
US20240084410A1 (en) | Bleed-off gas recovery in a direct reduction process | |
CN117460845A (zh) | 还原铁的制造方法 | |
KR100803983B1 (ko) | 용철제조장치 및 용철제조방법 | |
TW202330942A (zh) | 用於操作豎爐設備之方法 | |
TW202336237A (zh) | 用於操作高爐設備的方法 | |
JPH04314808A (ja) | 溶融還元炉における排ガス改質方法と装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13898893 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 139550140003003019 Country of ref document: IR |
|
WWE | Wipo information: entry into national phase |
Ref document number: MX/A/2016/007469 Country of ref document: MX |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2013898893 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013898893 Country of ref document: EP |