WO2018229720A1 - Operating method of an iron making installation and associated operating installation - Google Patents

Operating method of an iron making installation and associated operating installation Download PDF

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Publication number
WO2018229720A1
WO2018229720A1 PCT/IB2018/054413 IB2018054413W WO2018229720A1 WO 2018229720 A1 WO2018229720 A1 WO 2018229720A1 IB 2018054413 W IB2018054413 W IB 2018054413W WO 2018229720 A1 WO2018229720 A1 WO 2018229720A1
Authority
WO
WIPO (PCT)
Prior art keywords
roasting
gas
drying
operating method
exhaust gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2018/054413
Other languages
French (fr)
Inventor
Joris GEEROMS
Kurt SPELIER
Stefaan VAN DE CASTEELE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal SA
Original Assignee
ArcelorMittal SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ES18740647T priority Critical patent/ES2907767T3/en
Priority to CN202411332906.3A priority patent/CN119164213A/en
Priority to PL18740647T priority patent/PL3638817T3/en
Priority to UAA202000238A priority patent/UA124600C2/en
Priority to KR1020197036330A priority patent/KR102320617B1/en
Priority to MX2019015267A priority patent/MX2019015267A/en
Priority to JP2019569363A priority patent/JP2020524741A/en
Priority to CA3067145A priority patent/CA3067145C/en
Priority to RU2020101293A priority patent/RU2750640C1/en
Application filed by ArcelorMittal SA filed Critical ArcelorMittal SA
Priority to CN201880037313.0A priority patent/CN110719962A/en
Priority to BR112019025055-7A priority patent/BR112019025055B1/en
Priority to EP18740647.5A priority patent/EP3638817B1/en
Priority to US16/619,044 priority patent/US11525167B2/en
Publication of WO2018229720A1 publication Critical patent/WO2018229720A1/en
Anticipated expiration legal-status Critical
Priority to JP2022074243A priority patent/JP7407224B2/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/50—Ducting arrangements from the source of air or other gases to the materials or objects being dried
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • C10B57/10—Drying
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C21B5/023—Injection of the additives into the melting part
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/002—Evacuating and treating of exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/40—Arrangements for supplying or controlling air or other gases for drying solid materials or objects using gases other than air
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/08—Drying or removing water
    • 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
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
    • 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
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material

Definitions

  • the invention is related to an operating method of an iron making installation and to the associated installation.
  • the iron making process which can be either performed in a blast furnace or a DRI furnace such as MIDREX® or COREX® always require the use of a carbon containing material as raw material.
  • This carbon containing material can either be brought as pulverized coal, charcoal, coke or other forms.
  • patent WO 201 1 /052796 describes a method of using biomass, such as wood waste from construction or agricultural waste as a substitute for pulverized coal in a blast furnace.
  • biomass such as wood waste from construction or agricultural waste as a substitute for pulverized coal in a blast furnace.
  • the biomass is dried in a rotary kiln to manufacture biomass coal, the biomass is then pulverized together with coal and blown through a tuyere into the blast furnace.
  • the exhausts gas of the rotary kiln are collected and sent to a gas heater which further re-injects them into the rotary kiln as a heating source of the outer row.
  • Patent EP 1 264 901 B1 from Kobe Steel describes a method for producing reduced iron in which organic matter-containing components such as wood, resin, trash or industrial waste are loaded into a carbonization furnace together with iron oxide which is used at heat medium. The product of this carbonization is then agglomerated and used as reducing agent into a reduction furnace. In the described method, the exhausts gas from the reduction furnace are used as combustion gas into the carbonization furnace, while the distilled gas resulting from the carbonization are used as fuel for the reduction furnace.
  • Patent US 2014/0306386 describes a method of using wood as fuel into a blast furnace.
  • wood is sized and dried, coarse particles are then loaded into the throat of the blast furnace while finer particles are sent to a combustion chamber.
  • Hot gas exhausted from the combustion chamber are either sent to a power plant or used at heat source to preheat the hot blast further injected into the blast furnace.
  • Top gas exhausted from the blast furnace is used as gas source for the combustion.
  • Patent JP 2009-057438 describes aims to provide a manufacturing method of pulverized carbon material resulting from biomass carbonization whose resulting product may be easily turned into a fine powder suitable for blowing into the blast furnace while achieving high efficient recovery of energy in the biomass.
  • Patent application DE 196 06 575 A1 discloses a method for managing residual and waste material of any kind.
  • waste materials are pre-treated in a pyrolysis reactor which can be heated thanks to blast furnace top gas.
  • Roasted material is then separated between ferrous and non-ferrous materials.
  • Ferrous materials are then sent to a mill and injected in the blast furnace through the tuyere.
  • waste materials may comprise a lot of volatile compounds which are detrimental to the environment. It is so necessary to have a specific treatment step of the exhausts gas so as to remove these components and avoid them to be released into the atmosphere.
  • the aim of the invention is to provide an operating method of an iron making installation which is independent of the characteristics of the waste materials used in the iron making process and which prevents pollutants from being released into the atmosphere without necessity of dedicated equipment.
  • An additional aim of the invention is to improve overall carbon balance by substituting fossil carbon used in an iron making process by organic carbon.
  • the invention relates to method of operating of an iron making installation, the method comprising the steps of: a. Drying waste material using a drying gas, the drying gas comprising an exhaust gas from a sinter plant, b. Roasting the dried waste material using a roasting gas, so as to produce coal and a roasting exhaust gas.
  • the operating method according to the invention may also comprise following characteristics, taken alone or in combination: the drying gas comprises at least 50% of an exhaust gas from a sinter plant,
  • the method further includes a step of recycling at least a part of the roasting exhaust gas to the sinter plant,
  • the drying gas has a temperature of at least 70°C
  • the sinter plant exhaust gas has a temperature comprised between 100 and 150°C when it is mixed with other components to form the drying gas
  • the roasting is performed at a temperature comprised between 200 and 320°C
  • roasting exhausts gas is used in the roasting step as part of the roasting gas
  • the milled coal has a particle size inferior to 10 ⁇
  • the dried material has moisture content inferior to 10%
  • the waste material is an organic waste material
  • the organic waste material is waste wood.
  • the invention also relates to an installation comprising:
  • drying mean able to dry waste materials using a drying gas and comprising injection means to inject the drying gas into the drying means
  • roasting mean able to roast the dried waste material at a temperature comprised between 200 and 320°C using a roasting gas, so as to produce coal and a roasting exhaust gas
  • a sinter plant producing sintered material and sinter exhaust gas
  • first collection means to collect sinter exhaust gas
  • e. connexion means defined to connect the first collection means to the injection means so as to inject a part of the sinter exhausts gas into the drying means.
  • the installation according to the invention may also comprise a belt dryer as drying mean.
  • the installation according to the invention may also comprise a pyrolysis reactor as roasting mean.
  • FIG. 1 illustrates an example of installation to implement a method according to a first embodiment the invention
  • FIG. 2 illustrates an example of installation to implement a method according to another embodiment of the invention.
  • the installation comprises a drying equipment 2, a roasting equipment 3, a sinter plant 4 and an iron making installation 5.
  • the installation may further comprises a mill 6.
  • the iron making installation 5 is a blast furnace 5 but it could also be a Direct Reduction furnace or any DRI installation.
  • Waste material 1 which can be for example chosen among waste trash, industrial waste or organic waste, is loaded into drying equipment 2.
  • the waste material 1 is preferably organic waste, and more preferably wood waste, by example coming from dismantled buildings.
  • the drying equipment is for example a belt dryer or a rotary kiln dryer.
  • a drying gas 12 is injected inside the drying equipment 2 in order to bring the necessary heat to dry the waste material 1 .
  • the gas 12 has preferably a temperature of at least 70°C.
  • the dried waste material is sent to roasting equipment 3.
  • the roasting equipment 3 is preferably designed so as to avoid contact between roasting gas and dried material. It is, for example, a pyrolysis reactor or a rotary kiln.
  • a roasting gas 13 is injected inside the roasting equipment 3 so as to heat the dried waste material.
  • the heat can be brought directly by the roasting gas or through burners, fuel of which being the roasting gas 13.
  • the roasting step is preferentially performed at a temperature comprised between 200°C and 320°C. It produces a roasted waste material but generates also roasting exhaust gas 19.
  • This roasting exhaust gas 19 contains volatile compounds such as CI, SO x or NO x resulting from the roasting of the waste material.
  • This roasting exhaust gas has to be treated in a specific treatment installation 9 to capture the volatile compounds and avoid releasing them into the atmosphere.
  • the roasted waste material also called coal or biocoal is then injected into the blast furnace 5. It may so replace traditional coke or fossil coal as carbon source and consequently improve the overall carbon balance by avoiding use of fossil carbon.
  • the coal or biocoal is first sent to a mill 6 where it is milled to particles having a size inferior to 200 ⁇ , and preferentially a size inferior to 150 ⁇ .
  • the fine coal or biocoal is then injected into the blast furnace through a tuyere (not represented) as a substitute to coal in the known method of Pulverized Coal Injection (PCI).
  • PCI Pulverized Coal Injection
  • the installation further comprises a sinter plant 4.
  • a sinter plant iron ore fines are agglomerated with fluxes, such as limestone or olivine, and with solid fuel, such as coke breeze or anthracite, at high temperature, to create a product that can be used in a blast furnace 5.
  • fluxes such as limestone or olivine
  • solid fuel such as coke breeze or anthracite
  • the fine particles are then melted together and agglomerated in a sinter cake once cooled.
  • This sinter cake is then cracked and further cooled in a sinter cooler (not illustrated) before being loaded into the blast furnace 5.
  • the sinter cooler also emits exhaust gas, mainly hot air.
  • the air and fumes sucked by the wind boxes 8 as well as hot air emitted by the sinter cooler are called sinter exhaust gas 14.
  • this sinter exhaust gas 14 is sent to the drying equipment so as to be used as part of the drying gas 12.
  • This drying gas 12 comprises at least 50% of sinter exhaust gas 14, and more preferably more than 80%.
  • the drying gas 12 may additionally be composed of natural gas.
  • the sinter exhaust gas 14 may be composed exclusively of the air and fumes sucked by the wind boxes 8, or exclusively of hot air emitted by the sinter cooler, or of both of them.
  • the sinter exhaust gas 14 is first subjected to a cleaning step before being mixed with other components to form the drying gas 12. This cleaning step maybe for example performed by a filter bag installation.
  • the sinter exhaust gas 14 has preferentially a temperature comprised between 100 and 150°C when it is mixed with other components to form the drying gas 12.
  • the drying gas 12 may be exclusively constituted of the sinter exhaust gas 14.
  • the sinter exhaust gas 14 comes from the ignited material on the circular belt, it has a high calorific power and so when used as part or total of the drying gas 12 in the drying step it always bring enough heat to dry the waste material 1 , whatever its characteristics, and notably its moisture content. There is no more need to use external energy sources.
  • the roasting exhaust gas 19a is not sent to a gas treatment installation 9 but is rather sent to the sinter plant 4 where it may replace a portion of the solid fuel which is mixed with the iron fines. This prevents the use of additional costly equipment and avoids the release of pollutants into the atmosphere.
  • the roasting exhaust gas 19b is recycled into the roasting equipment 3, where it serves as part of the roasting gas 13 to heat the dried waste material. It can also be used as part 19c of the drying gas 12 for the drying step.
  • the roasting exhaust gas may be used in stoves to heat air which is then blown into the blast furnace.
  • the roasting exhaust gas may be sent to a power plant to produce electricity.
  • the exhaust gas of the blast furnace also called top gas or any steelmaking exhaust gas such as coke oven gas or converter gas maybe used as part of the drying or roasting gases.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture Of Iron (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention is related to a method of operating an iron making installation, in which waste material is dried using a drying gas, the drying gas comprising an exhaust gas from a sinter plant, and the dried material is roasted a roasting gas, so as to produce coal and a roasting exhaust gas. The invention is also related to the associated installation.

Description

Operating method of an iron making installation and associated operating
installation
[001 ] The invention is related to an operating method of an iron making installation and to the associated installation.
[002] The iron making process, which can be either performed in a blast furnace or a DRI furnace such as MIDREX® or COREX® always require the use of a carbon containing material as raw material. This carbon containing material can either be brought as pulverized coal, charcoal, coke or other forms.
[003] In recent years, in the course of C02 reduction there has been a lot of development aiming at recycling carbon-containing waste materials as substitute to these carbon containing materials. Those carbon-containing waste materials maybe for example wood from construction area, agricultural or food residues, home trash or industrial wastes. In the rest of the text, term waste material will be used and has to be understood as carbon-containing waste material.
[004] For example, patent WO 201 1 /052796 describes a method of using biomass, such as wood waste from construction or agricultural waste as a substitute for pulverized coal in a blast furnace. In this method the biomass is dried in a rotary kiln to manufacture biomass coal, the biomass is then pulverized together with coal and blown through a tuyere into the blast furnace. The exhausts gas of the rotary kiln are collected and sent to a gas heater which further re-injects them into the rotary kiln as a heating source of the outer row.
[005] Patent EP 1 264 901 B1 from Kobe Steel describes a method for producing reduced iron in which organic matter-containing components such as wood, resin, trash or industrial waste are loaded into a carbonization furnace together with iron oxide which is used at heat medium. The product of this carbonization is then agglomerated and used as reducing agent into a reduction furnace. In the described method, the exhausts gas from the reduction furnace are used as combustion gas into the carbonization furnace, while the distilled gas resulting from the carbonization are used as fuel for the reduction furnace.
[006] Patent US 2014/0306386 describes a method of using wood as fuel into a blast furnace. In this method wood is sized and dried, coarse particles are then loaded into the throat of the blast furnace while finer particles are sent to a combustion chamber. Hot gas exhausted from the combustion chamber are either sent to a power plant or used at heat source to preheat the hot blast further injected into the blast furnace. Top gas exhausted from the blast furnace is used as gas source for the combustion.
[007] Patent JP 2009-057438 describes aims to provide a manufacturing method of pulverized carbon material resulting from biomass carbonization whose resulting product may be easily turned into a fine powder suitable for blowing into the blast furnace while achieving high efficient recovery of energy in the biomass.
[008] In none of this patent is taken into account the variability of the waste materials. Indeed the characteristics of those materials may vary in terms of humidity and calorific power from one batch to another. Consequently the calorific power of the carbonization exhaust gas will also vary depending on the waste material which is roasted and in some cases the resulting exhausts gas will not release enough energy to roast the following batch of waste material. External energy supply may then be needed.
[009] Patent application DE 196 06 575 A1 discloses a method for managing residual and waste material of any kind. In this document, waste materials are pre-treated in a pyrolysis reactor which can be heated thanks to blast furnace top gas. Roasted material is then separated between ferrous and non-ferrous materials. Ferrous materials are then sent to a mill and injected in the blast furnace through the tuyere.
[0010] Moreover those waste materials may comprise a lot of volatile compounds which are detrimental to the environment. It is so necessary to have a specific treatment step of the exhausts gas so as to remove these components and avoid them to be released into the atmosphere.
[001 1 ] The aim of the invention is to provide an operating method of an iron making installation which is independent of the characteristics of the waste materials used in the iron making process and which prevents pollutants from being released into the atmosphere without necessity of dedicated equipment.
[0012] An additional aim of the invention is to improve overall carbon balance by substituting fossil carbon used in an iron making process by organic carbon.
[0013] To this end, the invention relates to method of operating of an iron making installation, the method comprising the steps of: a. Drying waste material using a drying gas, the drying gas comprising an exhaust gas from a sinter plant, b. Roasting the dried waste material using a roasting gas, so as to produce coal and a roasting exhaust gas.
The operating method according to the invention may also comprise following characteristics, taken alone or in combination: the drying gas comprises at least 50% of an exhaust gas from a sinter plant,
- the method further includes a step of recycling at least a part of the roasting exhaust gas to the sinter plant,
- the drying gas has a temperature of at least 70°C,
- the sinter plant exhaust gas has a temperature comprised between 100 and 150°C when it is mixed with other components to form the drying gas,
- the roasting is performed at a temperature comprised between 200 and 320°C,
- at least a part of the roasting exhaust gas is used as part of the drying gas,
- the roasting exhausts gas is used in the roasting step as part of the roasting gas,
- after the roasting step the coal is used as raw material into an iron making process,
- after the roasting step the coal is subjected to a milling step and milled coal is injected into a blast furnace through a tuyere,
- the milled coal has a particle size inferior to 10 μηι,
- at least 4% in weight of solid material injected through the tuyere is milled coal,
- after the drying step, the dried material has moisture content inferior to 10%,
- the roasting exhausts gas is injected into an iron making process,
- the roasting exhausts gas is sent to a power plant,
- the waste material is an organic waste material, the organic waste material is waste wood.
[0014] The invention also relates to an installation comprising:
a. drying mean able to dry waste materials using a drying gas and comprising injection means to inject the drying gas into the drying means, b. roasting mean able to roast the dried waste material at a temperature comprised between 200 and 320°C using a roasting gas, so as to produce coal and a roasting exhaust gas, c. a sinter plant producing sintered material and sinter exhaust gas, d. first collection means to collect sinter exhaust gas, e. connexion means defined to connect the first collection means to the injection means so as to inject a part of the sinter exhausts gas into the drying means.
The installation according to the invention may also comprise a belt dryer as drying mean.
The installation according to the invention may also comprise a pyrolysis reactor as roasting mean.
[0015] The invention will be better understood upon reading the description which follows, given with reference to the following appended figures:
FIG. 1 illustrates an example of installation to implement a method according to a first embodiment the invention
FIG. 2 illustrates an example of installation to implement a method according to another embodiment of the invention.
[0016] The installation comprises a drying equipment 2, a roasting equipment 3, a sinter plant 4 and an iron making installation 5. In another embodiment the installation may further comprises a mill 6. In the following description the iron making installation 5 is a blast furnace 5 but it could also be a Direct Reduction furnace or any DRI installation.
[0017] Waste material 1 which can be for example chosen among waste trash, industrial waste or organic waste, is loaded into drying equipment 2. The waste material 1 is preferably organic waste, and more preferably wood waste, by example coming from dismantled buildings. The drying equipment is for example a belt dryer or a rotary kiln dryer.
[0018] During the drying step, a drying gas 12 is injected inside the drying equipment 2 in order to bring the necessary heat to dry the waste material 1 . The gas 12 has preferably a temperature of at least 70°C.
[0019] Once the drying step is over, preferably when the waste material has moisture content inferior to 10%, and most preferably inferior to 5%, the dried waste material is sent to roasting equipment 3. The roasting equipment 3 is preferably designed so as to avoid contact between roasting gas and dried material. It is, for example, a pyrolysis reactor or a rotary kiln.
[0020] During the roasting step, a roasting gas 13 is injected inside the roasting equipment 3 so as to heat the dried waste material. The heat can be brought directly by the roasting gas or through burners, fuel of which being the roasting gas 13. The roasting step is preferentially performed at a temperature comprised between 200°C and 320°C. It produces a roasted waste material but generates also roasting exhaust gas 19. This roasting exhaust gas 19 contains volatile compounds such as CI, SOx or NOx resulting from the roasting of the waste material. This roasting exhaust gas has to be treated in a specific treatment installation 9 to capture the volatile compounds and avoid releasing them into the atmosphere.
[0021 ] The roasted waste material, also called coal or biocoal is then injected into the blast furnace 5. It may so replace traditional coke or fossil coal as carbon source and consequently improve the overall carbon balance by avoiding use of fossil carbon.
[0022] Optionally the coal or biocoal is first sent to a mill 6 where it is milled to particles having a size inferior to 200 μηι, and preferentially a size inferior to 150μηι. The fine coal or biocoal is then injected into the blast furnace through a tuyere (not represented) as a substitute to coal in the known method of Pulverized Coal Injection (PCI).
[0023] According to the invention the installation further comprises a sinter plant 4. In a sinter plant, iron ore fines are agglomerated with fluxes, such as limestone or olivine, and with solid fuel, such as coke breeze or anthracite, at high temperature, to create a product that can be used in a blast furnace 5. Basically, and as way of illustration, in a sinter plant, material is fed by hoppers in multi layers to a circular belt where it is ignited by an ignition hood 7. Air and fumes are sucked by wind boxes 8 from the bottom of the bed of material throughout the sintering machine to help the ignition process. Fire penetrates the material gradually along the belt, until it reaches the hearth layer. The fine particles are then melted together and agglomerated in a sinter cake once cooled. This sinter cake is then cracked and further cooled in a sinter cooler (not illustrated) before being loaded into the blast furnace 5. The sinter cooler also emits exhaust gas, mainly hot air.
[0024] The air and fumes sucked by the wind boxes 8 as well as hot air emitted by the sinter cooler are called sinter exhaust gas 14. According to the invention, this sinter exhaust gas 14 is sent to the drying equipment so as to be used as part of the drying gas 12. This drying gas 12 comprises at least 50% of sinter exhaust gas 14, and more preferably more than 80%. The drying gas 12 may additionally be composed of natural gas. The sinter exhaust gas 14 may be composed exclusively of the air and fumes sucked by the wind boxes 8, or exclusively of hot air emitted by the sinter cooler, or of both of them. Optionally, the sinter exhaust gas 14 is first subjected to a cleaning step before being mixed with other components to form the drying gas 12. This cleaning step maybe for example performed by a filter bag installation.
[0025] The sinter exhaust gas 14 has preferentially a temperature comprised between 100 and 150°C when it is mixed with other components to form the drying gas 12. The drying gas 12 may be exclusively constituted of the sinter exhaust gas 14.
[0026] As the sinter exhaust gas 14 comes from the ignited material on the circular belt, it has a high calorific power and so when used as part or total of the drying gas 12 in the drying step it always bring enough heat to dry the waste material 1 , whatever its characteristics, and notably its moisture content. There is no more need to use external energy sources.
[0027] In a further embodiment, as illustrated in figure 2, the roasting exhaust gas 19a is not sent to a gas treatment installation 9 but is rather sent to the sinter plant 4 where it may replace a portion of the solid fuel which is mixed with the iron fines. This prevents the use of additional costly equipment and avoids the release of pollutants into the atmosphere.
[0028] In another embodiment, also illustrated on figure 2 in dotted lines, the roasting exhaust gas 19b is recycled into the roasting equipment 3, where it serves as part of the roasting gas 13 to heat the dried waste material. It can also be used as part 19c of the drying gas 12 for the drying step.
[0029] In another embodiment, not illustrated, the roasting exhaust gas may be used in stoves to heat air which is then blown into the blast furnace.
[0030] In another embodiment, not illustrated, the roasting exhaust gas may be sent to a power plant to produce electricity.
[0031 ] In further embodiment, not illustrated, the exhaust gas of the blast furnace, also called top gas or any steelmaking exhaust gas such as coke oven gas or converter gas maybe used as part of the drying or roasting gases.
[0032] All the embodiments of the invention thus described may be used in combination with one another.

Claims

1 ) Method of operating of an iron making installation, the method comprising the steps of: a. Drying waste material using a drying gas, the drying gas comprising an exhaust gas from a sinter plant, b. Roasting the dried waste material using a roasting gas, so as to produce coal and a roasting exhaust gas.
2) Operating method according to claim 1 , wherein the drying gas comprises at least 50% of an exhaust gas from a sinter plant.
3) Operating method according to claim 1 or 2, wherein the method further includes a step of recycling at least a part of the roasting exhaust gas to the sinter plant.
4) Operating method according to anyone of the previous claims, wherein the drying gas has a temperature of at least 70°C
5) Operating method according to anyone of the previous claims, in which the sinter plant exhaust gas has a temperature comprised between 100 and 150°C when it is mixed with other components to form the drying gas.
6) Operating method according to anyone of the previous claims, the roasting being performed at a temperature comprised between 200 and 320°C.
7) Operating method according to anyone of the previous claims, wherein at least a part of the roasting exhaust gas is used as part of the drying gas.
8) Operating method according to anyone of the previous claims, wherein the roasting exhausts gas is used in the roasting step as part of the roasting gas.
9) Operating method according to anyone of the previous claims, wherein after the roasting step the coal is used as raw material into an iron making process.
10) Operating method according to claim 9 into which after the roasting step the coal is subjected to a milling step and milled coal is injected into a blast furnace through a tuyere. 1 1 ) Operating method according to claim 1 1 into which the milled coal has a particle size inferior to 10 μηι.
12) Operating method according to claim 10 or 1 1 wherein at least 4% in weight of solid material injected through the tuyere is milled coal.
13) Operating method according to anyone of the previous claims wherein, after the drying step, the dried material has moisture content inferior to 10%.
14) Operating method according to anyone of the previous claims wherein the roasting exhausts gas is injected into an iron making process.
15) Operating method according to anyone of the previous claims wherein the roasting exhausts gas is sent to a power plant.
16) Operating method according to anyone of the previous claims wherein the waste material is an organic waste material.
17) Operating method according to claim 16 wherein the organic waste material is waste wood.
18) Installation comprising: a. drying mean 2 able to dry waste materials 1 using a drying gas 12 and comprising injection means to inject the drying gas into the drying mean 2, b. roasting mean 3 able to roast the dried waste material using a roasting gas 13, so as to produce coal and a roasting exhaust gas 19, c. a sinter plant 4 producing sintered material and sinter exhaust gas 14, d. first collection means to collect sinter exhaust gas, e. connexion means defined to connect the first collection means to the injection means so as to inject a part of the sinter exhausts gas 14 into the drying mean 2. 19) Installation according to claim 16 in which the drying mean 2 is a belt dryer.
20) Installation according to one of the claims 16 or 17 in which the roasting mean 3 is a pyrolysis reactor.
PCT/IB2018/054413 2017-06-16 2018-06-15 Operating method of an iron making installation and associated operating installation Ceased WO2018229720A1 (en)

Priority Applications (14)

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RU2020101293A RU2750640C1 (en) 2017-06-16 2018-06-15 Method of operation of an iron-producing unit and corresponding producing unit
PL18740647T PL3638817T3 (en) 2017-06-16 2018-06-15 OPERATING METHOD OF AN IRON MAKING INSTALLATION
UAA202000238A UA124600C2 (en) 2017-06-16 2018-06-15 Operating method of an iron making installation and associated operating installation
KR1020197036330A KR102320617B1 (en) 2017-06-16 2018-06-15 Method of operation of iron making apparatus and associated operation apparatus
MX2019015267A MX2019015267A (en) 2017-06-16 2018-06-15 Operating method of an iron making installation and associated operating installation.
JP2019569363A JP2020524741A (en) 2017-06-16 2018-06-15 Method of operating steelmaking equipment and related equipment
CA3067145A CA3067145C (en) 2017-06-16 2018-06-15 Operating method of an iron making installation and associated operating installation
ES18740647T ES2907767T3 (en) 2017-06-16 2018-06-15 Operating procedure of an iron manufacturing facility
CN201880037313.0A CN110719962A (en) 2017-06-16 2018-06-15 Method for operating an ironmaking plant and associated operating plant
CN202411332906.3A CN119164213A (en) 2017-06-16 2018-06-15 Operating methods of ironmaking equipment and related operating equipment
BR112019025055-7A BR112019025055B1 (en) 2017-06-16 2018-06-15 METHOD OF OPERATION OF AN IRON PRODUCTION FACILITY
EP18740647.5A EP3638817B1 (en) 2017-06-16 2018-06-15 Operating method of an iron making installation
US16/619,044 US11525167B2 (en) 2017-06-16 2018-06-15 Operating method of an iron making installation and associated operating installation
JP2022074243A JP7407224B2 (en) 2017-06-16 2022-04-28 Iron-making equipment operating method and related operating equipment

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