Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B1/00—Methods of steam generation characterised by form of heating method
  • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
  • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
  • F22B1/183—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines in combination with metallurgical converter installations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
  • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
  • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
  • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
  • F01K23/064—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle in combination with an industrial process, e.g. chemical, metallurgical
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B1/00—Methods of steam generation characterised by form of heating method
  • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
  • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
  • F22B1/1838—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines the hot gas being under a high pressure, e.g. in chemical installations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B1/00—Methods of steam generation characterised by form of heating method
  • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
  • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
  • F22B1/1861—Waste heat boilers with supplementary firing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
  • F27D17/004—Systems for reclaiming waste heat
• • 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
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E20/00—Combustion technologies with mitigation potential
  • Y02E20/14—Combined heat and power generation [CHP]
• • 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
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E20/00—Combustion technologies with mitigation potential
  • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
• • 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
  • Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2

Definitions

• the invention relates to a method for using the exhaust gases from plants for pig iron production for steam generation, wherein at least a portion of the exhaust gas removed as export gas from the plant for pig iron production and thermally recovered by combustion and wherein the exhaust gas from the combustion is fed to a heat recovery steam generator.
• Blast furnace process direct reduction and smelting reduction.
• iron ore is converted with reduction gas into sponge iron, which is then further processed in the electric arc furnace to produce crude steel.
• a melter gasifier in which hot liquid metal is produced, and at least one reduction reactor in which the carrier of the iron ore (lump, fine ore, pellets, sinter) is reduced with reducing gas, the reducing gas in the melter gasifier by gasification of Coal (and possibly a small proportion of coke) is produced with oxygen (90% or more).
• Gas purification systems on the one hand for the top gas from the reduction reactor, on the other hand for the reduction gas from the melter gasifier, a compressor, preferably with aftercooler, for the reduction gas recycled reducing gas, a device for C0 2 removal, according to the prior art usually by pressure change Adsorption and optionally provided a heater for the reducing gas and / or a combustion chamber for partial combustion with oxygen.
• the COREXO process is a two-stage smelting reduction process.
• the smelting reduction combines the process of direct reduction (prereduction of iron to
• the well-known FINEXO process essentially corresponds to the COREX® process, but iron ore is introduced as fine ore.
• Export gas is used to generate steam.
• the purpose of this method is to maximize nitrogen-free
• a disadvantage of the method according to WO 2008/086877 A2 is that, first, before the gas turbine, a fuel compressor must be used and before this the temperature of the export gas must be reduced, so that the compression can be carried out economically.
• the export gas is usually on Approximately ambient temperature, for example, to about 40 ° C, cooled. Through this cooling but energy goes for the
• the object is achieved by a method according to claim 1, by passing the export gas into a combustion chamber, which is arranged in front of the heat recovery steam generator, and heat is removed from the export gas after combustion in the heat recovery steam generator without the export gas between combustion and heat recovery steam generator, a gas turbine by adjusting the pressure in the combustion chamber and the heat recovery steam generator above the atmospheric pressure, in particular up to 3.5 bar g , by adjusting the amount of export gas entering the combustion chamber or heat recovery steam generator, respectively, by a gas flow regulator the
• Heat recovery steam generator is arranged.
• a heat recovery steam generator or heat recovery steam generator is a steam boiler that uses the hot exhaust gas from an upstream steam generation process.
• a waste heat boiler has no combustion chamber and no burners, only contact or Konvezzyswevid are arranged, which are covered by the exhaust gas.
• the sensible heat of the export gas for steam generation in the heat recovery steam generator can be used, the export gas in the form of top gas from a reduction shaft of a COREXO plant or from the fluidized bed reactor of a
• FINEXO plant can have a temperature of up to 500 ° C.
• the dust from this export gas contains up to 40 percent carbon, which can be used by combustion for steam generation and not by the dust removal before one
• an embodiment of the invention provides that the export gas at a temperature greater than 100 ° C, preferably at a temperature greater than 200 ° C, more preferably at a temperature greater than 300 ° C, is passed into the combustion chamber. Accordingly sees an additional or alternative
• the export gas contains at least a proportion of 5-40 g / Nm 3 of carbon supports, which share in turn 5-40% elemental
• hydrocarbons contained in the export gas in particular aromatic hydrocarbons such as benzene, to be burned in the combustion chamber and thus rendered harmless on the one hand and used for heat production on the other hand. It may in this case but no or only one
• the rest is extracted in the form of combustible gases and burned in the steam generator and converted by a turbine generator into electrical energy.
• Reduction gas for example in the form of natural gas, introduced into the usually carried out as a fixed bed reduction shaft.
• the combustion chamber according to the invention is usually with
• Refractory materials lined e.g. be bricked up. It can be used together with the heat recovery steam generator either at
• the combustion chamber and the heat recovery steam generator are operated under overpressure, by adjusting the overpressure in the combustion chamber and in the heat recovery steam generator, the amount of export gas that enters the combustion chamber can be adjusted. That is, there is no control valve provided in the line, which directs the export gas from the plant for pig iron production to the combustion chamber, but it is the performance of the heat recovery steam generator adapted directly to the performance of the plant for pig iron production, the two are thus pressure-equalizing connected. So that can Even a separate hot flare for the plant for pig iron production omitted, since the export gas is also implemented in the startup and shutdown of the plant for pig iron production in the combustion chamber. In the case of standstill of the plant for pig iron production, a substitute fuel (eg natural gas) can be used, which is burned by its own burner in the combustion chamber. For this purpose, the export gas line with shut-off valves is separated from the combustion chamber.
• a substitute fuel eg natural gas
• Carbon-containing fraction of the dust can be completely burned and used for steam generation. It assumes, however, that the burners in the combustion chamber and the heating surfaces of the
• Heat recovery steam generator for dust loads up to 5 g / Nm 3 are designed.
• the exhaust gas emerging from at least one reduction reactor of the plant for the production of pig iron is coarsely dedusted from the heat recovery steam generator and that from the exhaust gas
• Heat recovery steam generator exiting burnt export gas is finely dedusted.
• the coarse dedusting should in any case be done dry, eg by means of a cyclone, so that the exhaust gas or the export gas is not cooled down.
• a wet dedusting complex water systems and a sludge treatment would be necessary, the iron girders and the carbon from the dust would be lost with the mud.
• Heat recovery steam generator exiting burnt export gas is not dedusted.
• Fine dedusting such as using ceramic filters, electrostatic precipitators or fabric filters. Coarse and fine dedusting are dry.
• the pressure energy of the export gas in front of the combustion chamber can be reduced in any case via an expansion turbine or via a valve.
• the pressure of the export gas is usually between 8 and 12 bar g .
• the use of a relaxation turbine has the
• the regime for adjusting the amount of export gas may be adjusted before
• Heat recovery steam generator can be arranged and this does not necessarily have to be executed as a pressure vessel, because he does not have to be operated under pressure.
• the method according to the invention is in a preferred
• Embodiment supplied the energy for the reduction of iron ore in the production of pig iron exclusively in the form of fuels. This makes a significant difference
• the method according to the invention is preferably used in connection with the production of pig iron according to the
• the export gas contains at least one of the following emissions:
• Heat recovery steam generator and possibly after the deducted from the heat recovery steam generator burned export gas was dedusted.
• the system according to the invention for carrying out the method comprises at least
• the plant according to the invention is characterized in that the heat recovery steam generator is connected directly downstream of the combustion chamber, so that no other unit, in particular no gas turbine, is located between the combustion chamber and the heat recovery steam generator.
• the system according to the invention is further characterized in that a gas flow regulator is arranged after the heat recovery steam generator for adjusting the pressure in the combustion chamber and heat recovery steam generator above the atmospheric pressure.
• the combustion chamber and the heat recovery steam generator can be operated under pressure, it can be provided that the Combustion chamber and the heat recovery steam generator are designed as a pressure vessel, the internal pressure of up to 3.5 bar g
• dedusting arise in the plant according to the invention as follows: between at least one reduction reactor of the plant for pig iron production and the heat recovery steam generator is no dedusting and after the heat recovery steam generator at least one dedusting system is arranged between at least one reduction reactor of the system for
• Heat recovery steam generator is at least one
• Fine dedusting system arranged, - between at least one reduction reactor of the plant for
• Heat recovery steam generator is arranged no dedusting system.
• a expansion turbine or a valve is arranged in front of the combustion chamber to reduce the pressure energy of the export gas.
• the plant comprises pig iron production
• a direct reduction plant, or at least one line is provided with which Exhaust gas from a melter gasifier
• Exhaust gas can be passed from a reduction shaft of a direct reduction plant in the export gas line.
• a reduction shaft of a direct reduction plant in the export gas line.
• Gas flow regulator may be arranged after the heat recovery steam generator, possibly after the dedusting or the
• the sensible heat of the export gas for Dampf, Electricity generation can be used without having its own
• Waste heat boiler for the top gas or other waste gas from pig iron production plants must be arranged.
• Heat recovery steam generator assumes both the function of a conventional waste heat boiler for the top gas or another exhaust gas and the function of the steam generator of the steam power plant.
• Dedusting is reduced by the at least partial relocation of dedusting after the heat recovery steam generator, the cost of dedusting in the production of pig iron. Due to the lower pressure losses in the saving of
• Gas purification plants can use the pressure of the export gas before or after the heat recovery steam generator in an expansion turbine.
• the dust deposited according to the invention either falls dry, is burned or scrubbed in the combustion chamber. It's falling less or no dust than mud, which is what
• Emissions can be reduced because the process water quantity is at least reduced by the invention and the hydrocarbons contained in the export gas are burned in the combustion chamber.
• FIG. 3 shows a plant according to the invention with a COREXO plant and dry dedusting of the top gas
• FIG. 4 shows a plant according to the invention with a COREXO plant and partial wet cleaning of the top gas
• FIG. 5 shows a plant according to the invention with a FINEXO system and dry dedusting of the top gas
• Fig. 6 shows a plant according to the invention with a FINEXO system and partial wet cleaning of the top gas.
• Fig. 1 shows a system diagram without dedusting the export gas 12 (top gas) before the heat recovery steam generator 29.
• the illustrated here Plant for the production of pig iron is a COREXO plant whose exact operation of the description to Fig. 3 can be seen. But it could also lead to any other plant for pig iron production export gas 12 to the combustion chamber 23.
• the COREXO plant has a reduction shaft 45, which is designed as a fixed bed reactor, and is charged with lump, pellets, sinter and additives, see reference numeral 46 in Fig. 3. In countercurrent to the lump etc., the reducing gas 43 is guided. It is introduced at the bottom of the reduction shaft 45 and exits at the top as top gas 57 from. The top gas 57 from the reduction shaft 45 is not cleaned and at least part of it is taken as export gas 12 from the COREXO plant. With regard to the further use of the top gas 57, see FIG. 3.
• the reduction gas 43 for the reduction shaft 45 is produced in a melter gasifier 48, in which coal is supplied on the one hand, and on the other hand the iron ore prereduced in the reduction shaft 45 is added.
• Melt carburetor 48 is gasified, the resulting gas mixture is withdrawn as top gas (generator gas) 54 and a partial flow as reducing gas 43 fed to the reduction shaft 45.
• top gas generator gas
• the withdrawn from the melter gasifier 48 generator gas 54 is passed into a separator 59 to dry precipitate with discharged dust and the dust on dust burner in the
• top dust 54 purified by the coarse dust is further purified by wet scrubber 68 and removed as excess gas 69 from the COREXO plant and admixed with the top gas 57 or the export gas 12.
• Wet scrubber 68 is cooled to a gas compressor 70
• Repatriation may contain the reducing components contained therein can still be exploited for the COREX® process and on the other hand, the required cooling of the hot top or gas generator 54 from about 1050 ° C to 700-900 ° C can be ensured.
• the amount of the excess gas 69, which is supplied to the export gas 12 is measured by a flow meter 17 and in
• a gas flow regulator 31 which is arranged in the exhaust pipe after the heat recovery steam generator 29, set.
• the pressure regulator 33 arranged behind the flowmeter 17 in the direction of flow of the excess gas 69 optionally opens the valve assigned to it to such an extent that the pressure in the melter gasifier 48 does not reach a predetermined value
• the arrangement of the gas flow regulator 31 after the heat recovery steam generator 29 is advantageous because there the
• Gas temperature is lower than the temperature of the export gas in front of the combustion chamber 23rd
• the excess gas 69 has a higher pressure and a higher temperature than the top gas 57, which can be used to purify the excess gas in a wet scrubber 68 and then supply it to the top gas 57.
• the exhaust gas from the combustion chamber 23 is fed directly into the heat recovery steam generator 29, where there is steam for the steam cycle with a
• the plant according to FIG. 2 corresponds in most of the plant parts to that of FIG. 1 with the difference that in FIG. 2 before the heat recovery steam generator 29, namely after the reduction shaft 45 and before the confluence of the excess gas 69, a dry
• Dedusting the top gas 57 takes place in a coarse dedusting system 74.
• a coarse dedusting system 74 For this purpose, after the heat recovery steam generator 29 still another - especially dry - dedusting system 73 (eg with ceramic filters, electrostatic precipitators or fabric filters) can be arranged.
• This embodiment can be applied when the burner and the heat exchangers of the waste heat steam generator 29 are designed for export gas 12 or exhaust gas with a dust content of about 5 g / Nm 3 . Otherwise, the fine dedusting system 73 would also be in front of the combustion chamber 23 (and after
• the gas flow regulator 31 in FIG. 2 if this withstands a dust load of approximately 5 g / Nm 3 and temperatures of 300-500 ° C., it can also be applied immediately after the dry coarse dedusting, ie after the coarse dedusting plant 74, to be ordered.
• Fig. 3 shows the connection according to the invention between a
• the power plant 24 is supplied by a COREXO plant with export gas 12, which can be cached in an export gas container, not shown. Not required for the power plant 24 export gas 22 may - as shown here - the
• Hot torch 19 or the metallurgical gas network about one
• the pressure energy content of the export gas 12 may also be in an expansion or
• Relaxation turbine 35 (English Top gas pressure recovery turbine) can be exploited, which is arranged in this example in front of the line 21 for export gas 22 to the hot flare.
• a corresponding diversion for the export gas 12 to the expansion turbine 35 is provided that the export gas 12 is not to be guided through the expansion turbine 35, for example due to low pressure.
• a corresponding pressure-controlled valve 18 is provided in the diversion.
• the export gas 12 is the combustion chamber 23 as fuel
• the burnt export gas is passed from the combustion chamber 23 directly into the heat recovery steam generator 29. There the burnt export gas gives its heat to the heat exchangers
• the COREXO plant has in this example a reduction shaft 45, which is designed as a fixed bed reactor and with
• Lump ore, pellets, sinter and additives is charged, see reference numeral 46.
• the reducing gas 43 is guided. It is introduced at the bottom of the reduction shaft 45 and exits at the top as top gas 57 from.
• the top gas 57 from the reduction shaft 45 is in a
• Fine dedusting system 73 which is designed here as a hot gas filter with ceramic filters, dry dedusted and removed at least a portion as export gas 12 from the COREXO plant.
• One part could be freed from C0 2 via a PSA plant, which is not shown here, located in the COREXO plant, and returned to the reduction shaft 45.
• the reduction gas 43 for the reduction shaft 45 is produced in a melter gasifier 48 into which coal in the form of lumpy coal 49, optionally with fine ore, is introduced. In addition, oxygen is supplied to 0 2 . On the other hand, the iron ore prereduced in the reduction shaft 45 is added.
• the coal in the melter gasifier 48 is gasified, resulting in a gas mixture consisting mainly of CO and H 2 , and as a top gas
• the generator gas 54 withdrawn from the melter gasifier 48 is passed into a separator 59, which is designed as a hot gas cyclone, to dry precipitate with discharged dust, in particular fine ore, and to return the dust 71 to the melter gasifier 48 via dust burners.
• a portion of the top dust 54 purified by the coarse dust is further purified by wet scrubber 68 and removed as excess gas 69 from the COREXO plant and admixed with the top gas 57 or the export gas 12.
• the control of the amount of the excess gas 69 has already been described in FIG.
• a portion of the purified top or generator gas 54 after the wet scrubber 68 is cooled to a gas compressor 70
• the reduction shaft 45 does not have to be a fixed bed, it can also be designed as a fluidized bed. At the lower end, either sponge iron, hot briquetted iron or low-reduction iron are removed depending on the charged feedstock and depending on the process.
• the export gas 12 finally arrives after the fine dedusting system 73 in the combustion chamber 23, where it burned and
• Any excess export gas 12 can also be derived between expansion turbine 35 and combustion chamber 23, optionally after the gas cooler 25 to the hot flare 19. After this
• Heat recovery steam generator 29, the gas flow regulator 31 is provided, which is regulated in dependence on the flow meter 17, not shown here (see FIGS. 1 and 2).
• the system and the function of the system according to FIG. 3 otherwise correspond to those of FIG. 2.
• the plant according to FIG. 4 largely corresponds to that of FIG. 3, but the dedusting of the top gas 57 is carried out differently: instead of a dedusting plant 73 in the form of a hot gas filter as in FIG. 3, a dry coarse dusting takes place in one
• Coarse dedusting plant 74 (cyclone), followed by a wet scrubber 11, followed by a fine dedusting plant 73 in the form of several fabric filters.
• a wet scrubber 11 Around the wet scrubber 11 around a diversion for the top gas 57 is provided to bypass the wet scrubbing of the top gas.
• the dust 72 from the coarse dedusting 74 can in the
• the gas flow regulator 31 is here after the
• Heat recovery steam generator 29 is provided.
• Exports gas 12 supplied which can be cached in an export gas tank 13. Not required for the power plant 24 export gas 22 can be returned to the metallurgical gas network, such as a raw material drying, or the hot flare 19.
• the FINEXO plant has in this example as reduction reactors four fluidized bed reactors 37-40, which are charged with fine ore. Fine ore and additives 41 are fed to the ore drying 42 and from there first to the fourth reactor 37, then they get into the third 38, the second 39 and finally into the first fluidized bed reactor 40.
• Fine ore and additives 41 are fed to the ore drying 42 and from there first to the fourth reactor 37, then they get into the third 38, the second 39 and finally into the first fluidized bed reactor 40.
• fluidized bed reactors 37-40 can also be present only three.
• the reducing gas 43 is guided. It is introduced at the bottom of the first fluidized bed reactor 40 and exits at its top. Before it enters from below into the second fluidized bed reactor 39, it can still with
• Oxygen 0 2 are heated, as well as between the second 39 and third 38 fluidized bed reactor.
• Fluidized bed reactors 37-40 are used in a fine dedusting plant 73, as a hot gas filter with ceramic filter elements
• Downstream combined cycle power plant 24 continues to be used.
• the reducing gas 43 is in a melter gasifier 48
• Fluidized bed reactors 37-40 prereduced and in the
• Iron briquetting 51 in hot condition to briquettes English: HCl Hot Compacted Iron
• briquettes English: HCl Hot Compacted Iron
• Iron briquettes arrive via a conveyor 52 in a storage tank 53, which is designed as a fixed bed reactor, where the iron briquettes with coarse purified gas generator 54 from the melter gasifier 48 optionally preheated and reduced. Cold iron briquettes 65 can also be added here. Subsequently, the iron briquettes or oxides are charged from above into the melter gasifier 48. Low reduced iron (LRI) may also be withdrawn from iron briquetting 51.
• LRI Low reduced iron
• the coal in the melter gasifier 48 is gasified, it produces a gas mixture consisting mainly of CO and H 2 , and withdrawn as a reducing gas (generator gas) 54 and a partial flow as reducing gas 43 is fed to the fluidized bed reactors 37-40.
• the hot metal melted in the melter gasifier 48 and the slag are withdrawn, see arrow 58.
• the withdrawn from the melter gasifier 48 top gas 54 is first passed into a separator 59 (hot gas cyclone) to
• Another part of the purified gas generator 54 is also further purified in a wet scrubber 62, fed to a gas compressor 63 for cooling and then after mixing with the removed from the PSA system 14, freed from CO 2 product gas 64 back to the generator gas 54 after the melter gasifier 48th supplied for cooling.
• a wet scrubber 62 fed to a gas compressor 63 for cooling and then after mixing with the removed from the PSA system 14, freed from CO 2 product gas 64 back to the generator gas 54 after the melter gasifier 48th supplied for cooling.
• Iron oxides with dedusted and cooled generator gas 54 are heated and reduced from the melter gasifier 48, emerging top gas 55 is purified in a wet scrubber 66 and then also at least partially fed to the PSA unit 14 to remove C0 2 .
• One part could also be the exhaust 44 from the
• the PSA system 14 may also be a part of the exhaust gas 44 from the
• Fluidized bed reactors 37-40 are added directly.
• the gases to be supplied to the PSA system 14 are previously cooled in a gas cooler 75, which works like gas cooler 25 based on cold water, is still compressed in a compressor 15 and then cooled in an aftercooler 16.
• the residual gas 20 from the PSA plant 14 can be completely or partially admixed with the export gas 12, for example via a residual gas tank 13 to equalize the residual gas quality. However, it can also be added via the unneeded export gas 22 to the metallurgical gas network or the hot flare 19 can be supplied for combustion, as has already been described under FIG.
• the pressure of the exhaust gas 44 from the fluidized bed reactors 37-40 can, as shown in Figs. 3-4, in a
• Relaxation turbine 35 are exploited and then, if necessary to be cooled in front of the combustion chamber 23 partially in a gas cooler 25 on a cold water basis.
• Combustion chamber 23 with that of Fig. 3 and 4.
• the gas flow regulator 31 is disposed after the heat recovery steam generator 29.
• FIG. 6 coincides except for the dedusting of the exhaust gas 44 with that of Fig. 5.
• a wet scrubber 11 is first arranged in the line for the exhaust gas 44 from the fluidized bed reactors 37-40, which as shown in FIG 4 can be at least partially bypassed via a diversion, in order to achieve the best possible effect according to the invention of the highest possible exhaust gas 44 or export gas 12.
• a fine dedusting system 73 is arranged in the form of a plurality of fabric filters, in which the exhaust gas is dry-cleaned of fine dust.
• the gas flow regulator 31 is arranged here as in FIG. 5.

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• 2013
  • 2013-04-05 KR KR1020147034068A patent/KR20150004426A/ko not_active Application Discontinuation
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