US20060027043A1 - Method and apparatus for producing clean reducing gases from coke oven gas - Google Patents

Method and apparatus for producing clean reducing gases from coke oven gas Download PDF

Info

Publication number
US20060027043A1
US20060027043A1 US11/194,578 US19457805A US2006027043A1 US 20060027043 A1 US20060027043 A1 US 20060027043A1 US 19457805 A US19457805 A US 19457805A US 2006027043 A1 US2006027043 A1 US 2006027043A1
Authority
US
United States
Prior art keywords
gas
coke oven
reducing gas
steam
utilizing
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.)
Abandoned
Application number
US11/194,578
Inventor
Eugenio Zendejas-Martinez
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.)
HYLASA SA de CV
Hylsa SA de CV
Original Assignee
Hylsa SA de CV
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
Application filed by Hylsa SA de CV filed Critical Hylsa SA de CV
Priority to US11/194,578 priority Critical patent/US20060027043A1/en
Assigned to HYLASA S.A. DE C.V. reassignment HYLASA S.A. DE C.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZENDEJAS-MARTINEZ, EUGENIO
Publication of US20060027043A1 publication Critical patent/US20060027043A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
    • C10J3/60—Processes
    • C10J3/64—Processes with decomposition of the distillation products
    • C10J3/66—Processes with decomposition of the distillation products by introducing them into the gasification zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/02—Preparation of oxygen
    • C01B13/0229—Purification or separation processes
    • C01B13/0248—Physical processing only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/36—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using oxygen or mixtures containing oxygen as gasifying agents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • 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
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/02—Processes for making hydrogen or synthesis gas
    • C01B2203/025—Processes for making hydrogen or synthesis gas containing a partial oxidation step
    • C01B2203/0255—Processes for making hydrogen or synthesis gas containing a partial oxidation step containing a non-catalytic partial oxidation step
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/0465—Composition of the impurity
    • C01B2203/0485—Composition of the impurity the impurity being a sulfur compound
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/06—Integration with other chemical processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/08—Methods of heating or cooling
    • C01B2203/0872—Methods of cooling
    • C01B2203/0888—Methods of cooling by evaporation of a fluid
    • C01B2203/0894—Generation of steam
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/80—Aspect of integrated processes for the production of hydrogen or synthesis gas not covered by groups C01B2203/02 - C01B2203/1695
    • C01B2203/84—Energy production
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2210/00—Purification or separation of specific gases
    • C01B2210/0043—Impurity removed
    • C01B2210/0046—Nitrogen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • 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
    • C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
    • C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
    • 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
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/42—Sulphur removal
    • 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
    • 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
    • C21B2100/66—Heat exchange
    • 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
    • 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

Definitions

  • the invention refers to a process and system for producing reducing gases mainly composed of hydrogen and carbon monoxide from coke-making operations where coal is transformed into metallurgical coke, and more particularly to a process wherein the volatile components derived from coal are transformed into reducing gases suitable for chemical utilization as synthesis gas, as a reducing agent for direct reduction of iron ores and/or as a clean fuel.
  • coal is heated in order to eliminate most of the volatile components and preserving mostly the carbon structure. Coke is thereby provided with the physical and chemical properties which make it fit for providing energy and burden support in blast furnaces.
  • Volatile matter of coal comprises a number of compounds which are distilled in coke ovens constituting what is known as coke oven gas.
  • the volume and composition of coke oven gas depends on the characteristics of the coal utilized but typically untreated coke oven gas comprises about 44% of water, about 29% of hydrogen, about 3% of carbon monoxide, about 13% of methane and many impurities as ammonia, sulfur, benzene-type compounds, etc.
  • coke oven gas Since coke oven gas has a high calorific value, it is utilized mostly for heating purposes in steel plants. Typically, coke oven gas is cooled, cleaned and treated in a number of chemical processes for separating valuable compounds such as ammonia and other petrochemicals and for removing sulfur before the gas is finally burned. Cleaning of coke oven gas require's a complex and costly chemical plant.
  • U.S. Pat. No. 4,178,266 describes a process for conveying hot crude coke oven gas generated in coke ovens to a position of utilization while preventing condensation of higher hydrocarbons.
  • This patent teaches to increase the temperature of the coke oven gas by injecting an oxygen-containing gas into the coke oven gas stream so that it is partially combusted. Such injection of oxygen may increase the temperature of the mixture to about 950° C. to 1500° C.
  • the purpose of the oxygen injection is to avoid condensation of impurities and of higher hydrocarbons, thereby preventing many problems in the gas conveying systems.
  • This patent does not teach or suggest carrying out a partial combustion of coke oven gas for producing a high-quality reducing gas.
  • British Patent Specification No. 1,566,970 describes a process for the treatment of coke oven gas.
  • This patent recognizes the value of performing a partial combustion of coke oven gas in order to produce a reducing gas useful for direct reduction of iron ores.
  • the partial combustion transforms coke oven gas into a cracked gas rich in carbon monoxide and hydrogen.
  • the partial combustion process of this patent however has a number of disadvantages and does not teach or suggest a process and apparatus which integrates the energy in an improved way.
  • the present invention provides a method and apparatus with a practical and economical way of using the coke oven gas by cooling it immediately after the partial combustion cracking and also utilizing the heat produced in said partial combustion for at least two specific purposes which are critical for the operation of the reduction reactor: e.g. for the CO2 removal unit of the recycled reducing gas to the shaft reactor, and also for the sulfur removal unit needed for cleaning the coke oven gas prior to its utilization.
  • the present invention provides a method of treating hot crude coke oven gas produced in coke ovens comprising: mixing said hot crude coke oven gas with an oxygen-containing gas in order to carry out a partial combustion of said coke oven gas producing a reducing gas having a high content of hydrogen and carbon monoxide at a temperature higher than about 1000° C.; passing said hot reducing gas through a heat exchanger in order to produce high temperature steam; utilizing a first portion of said steam to produce electricity; removing sulfur compounds and other impurities of said reducing gas in a sulfur removing unit; and utilizing a second portion of said steam in said sulfur removing unit.
  • the method further includes an additional step of utilizing at least a portion of said clean reducing gas in a direct reduction plant comprising a direct reduction reactor, a CO2 removal unit and a gas heater.
  • the method further includes the additional step of utilizing a third portion of said exhausted steam in said CO2 removal unit of said direct reduction plant.
  • FIG. 1 is a schematic process diagram of a preferred embodiment of the invention.
  • FIG. 2 illustrates an example of the process showing, in a schematic process diagram similar to FIG. 1 , values of process parameters.
  • FIG. 3 is a table supplementing the information of process streams shown in FIG. 2 .
  • FIG. 4 also illustrates another example of the process showing, in a schematic process diagram of a direct reduction plant, values of process parameters operating according to the coke oven gas cleaning method of the invention.
  • numeral 10 designates a battery of coke ovens, to which coal 12 is charged and heated therein by combustion of gases 14 and air 16 .
  • Coke 18 is discharged from ovens 10 in a manner known in the art and hot crude coke oven gas 20 is produced typically at a temperature of about 600° C. degrees to 700° C.
  • Hot crude coke oven gas 20 is then mixed with an oxygen-containing gas 22 which may be produced in an air separation plant 24 from air 26 .
  • the air separation plant 24 may be of the cryogenic or a PSA-type since the purity of oxygen is not critical for this application.
  • the process may also operate with oxygen-enriched air, although the quality of the resulting reducing gas is affected by the amount of nitrogen from said air feed.
  • Hot crude coke oven gas 20 at a temperature of about 650° C. is subject to a partial combustion with oxygen 22 in combustion chamber 28 reaching temperatures above about 1000° C. At this temperature all organic compounds are converted into a high temperature reducing gas 30 mainly composed of a mixture of hydrogen and carbon monoxide, carbon dioxide, methane and water.
  • Reducing gas 30 is passed through a heat exchanger 32 where it heats steam 34 from steam drum 36 and super-heated steam 38 is utilized in turbine 40 to produce electricity in electric generator 42 . Electricity is fed through line 44 and is used in air separation plant 24 to produce oxygen for the partial combustion of coke oven gas.
  • a first portion 50 of exhausted steam 46 from turbine 40 is used in sulfur separation unit 48 and a second portion 52 is used in the CO2 separation unit 54 of a direct reduction plant.
  • the reducing gas After passing through heat exchanger 32 , the reducing gas is fed to a boiler 56 where steam 58 is produced from water 60 and is held in steam drum 36 . From boiler 56 , reducing gas 62 is finally quenched by direct contact with water in cooler 64 . Condensed water is withdrawn through pipe 66 . Cold reducing gas 68 is then fed to blower 70 and then led through pipe 72 to be treated in a sulfur removal unit 48 in a manner known in the art producing solid sulfur 74 and a stream of clean reducing gas 76 .
  • a portion of the reducing gas 76 is used for heating the coke ovens through pipe 14 and another portion 78 is compressed in compressor 80 to be injected to the reduction gas loop of a direct reduction reactor 82 .
  • Iron oxides bearing particles 84 for example iron ore pellets, lumps or mixtures thereof, are fed to reduction reactor 82 and descend by gravity through said reactor where they are contacted with high temperature reducing gases 86 , for example above 900° C. whereby iron oxides are reduced to metallic iron, known as DRI or sponge iron 88 , and discharged from the lower part of the reduction reactor 82 to be utilized in steelmaking operations.
  • Reacted reducing gas 90 is withdrawn from reactor 82 and cooled down in cooler 92 where water is removed from the gas by condensation a portion of the cooled gas 94 is recycled to the reduction reactor and another portion 96 may be vented from the reduction loop and used for example in gas heater 98 .
  • the recycled reducing gas portion 94 is compressed in compressor 100 and fed to a carbon dioxide removal unit 54 where CO2 is removed from the system thus regenerating the reducing potential of the recycled gas by elimination of water 102 and CO2 104 which are the main products of the reduction reactions carried out in reactor 82 .
  • FIGS. 2, 3 and 4 A computer-model calculation of a plant incorporating the invention was made and the results are illustrated in FIGS. 2, 3 and 4 .
  • This example clearly shows the advantages of the invention regarding its application for obtaining a reducing gas for producing good-quality direct reduced iron.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture Of Iron (AREA)
  • Industrial Gases (AREA)

Abstract

A process and system for producing reducing gases are disclosed, wherein volatile components derived from coal are transformed into reducing gases suitable for utilization as synthesis gas, as a reducing agent for the direct reduction of iron ores and/or as a clean fuel.

Description

    FIELD OF THE INVENTION
  • The invention refers to a process and system for producing reducing gases mainly composed of hydrogen and carbon monoxide from coke-making operations where coal is transformed into metallurgical coke, and more particularly to a process wherein the volatile components derived from coal are transformed into reducing gases suitable for chemical utilization as synthesis gas, as a reducing agent for direct reduction of iron ores and/or as a clean fuel.
    • BACKGROUND OF THE INVENTION
  • It is known that in the process of producing metallurgical coke, coal is heated in order to eliminate most of the volatile components and preserving mostly the carbon structure. Coke is thereby provided with the physical and chemical properties which make it fit for providing energy and burden support in blast furnaces. Volatile matter of coal comprises a number of compounds which are distilled in coke ovens constituting what is known as coke oven gas. The volume and composition of coke oven gas depends on the characteristics of the coal utilized but typically untreated coke oven gas comprises about 44% of water, about 29% of hydrogen, about 3% of carbon monoxide, about 13% of methane and many impurities as ammonia, sulfur, benzene-type compounds, etc.
  • Since coke oven gas has a high calorific value, it is utilized mostly for heating purposes in steel plants. Typically, coke oven gas is cooled, cleaned and treated in a number of chemical processes for separating valuable compounds such as ammonia and other petrochemicals and for removing sulfur before the gas is finally burned. Cleaning of coke oven gas require's a complex and costly chemical plant.
  • A number of proposals are found in patents and other technical literature for utilizing coke oven gas after cleaning, alone or in combination with other gases, for iron reduction purposes or for steam and electricity generation.
  • U.S. Pat. No. 4,178,266 describes a process for conveying hot crude coke oven gas generated in coke ovens to a position of utilization while preventing condensation of higher hydrocarbons. This patent teaches to increase the temperature of the coke oven gas by injecting an oxygen-containing gas into the coke oven gas stream so that it is partially combusted. Such injection of oxygen may increase the temperature of the mixture to about 950° C. to 1500° C. The purpose of the oxygen injection is to avoid condensation of impurities and of higher hydrocarbons, thereby preventing many problems in the gas conveying systems. This patent does not teach or suggest carrying out a partial combustion of coke oven gas for producing a high-quality reducing gas.
  • British Patent Specification No. 1,566,970 describes a process for the treatment of coke oven gas. This patent recognizes the value of performing a partial combustion of coke oven gas in order to produce a reducing gas useful for direct reduction of iron ores. The partial combustion transforms coke oven gas into a cracked gas rich in carbon monoxide and hydrogen. The partial combustion process of this patent however has a number of disadvantages and does not teach or suggest a process and apparatus which integrates the energy in an improved way.
  • U.S. Pat. No. 4,235,624 describes a method for processing coke oven gas almost identical to the method of the above-referred British patent 1,566,970. This patent does not teach or suggest the integration of thermal energy in the treatment and cleaning of coke oven gas comprising a partial combustion step as the present invention.
  • U.S. Pat. No. 4,235,624 describes a method for processing coke oven gas almost identical to the method of the above-referred British patent 1,566,970. Although this patent teaches generally that the coke oven gas may be used as a reducing gas in an iron ore reduction shaft furnace, no detail is provided about a preferred manner of utilizing the integration of the thermal energy that the coke oven gas contains. As a matter of fact, the claims of this patent specify that the invention lies in the utilization of hot coke oven gas, that means that the coke oven gas is fed to the reactor without cooling it before its introduction into the shaft reactor. This process scheme has a number of disadvantages since all equipment involved in the handling and conduction of the coke oven gas from the coke ovens to the shaft reactor must be prepared for high-temperature operation.
  • In contrast, the present invention provides a method and apparatus with a practical and economical way of using the coke oven gas by cooling it immediately after the partial combustion cracking and also utilizing the heat produced in said partial combustion for at least two specific purposes which are critical for the operation of the reduction reactor: e.g. for the CO2 removal unit of the recycled reducing gas to the shaft reactor, and also for the sulfur removal unit needed for cleaning the coke oven gas prior to its utilization.
    • OBJECTS OF THE INVENTION
  • It is therefore an object of the present invention to provide a process and system for treating coke oven gas in order to produce a reducing gas comprising hydrogen and carbon monoxide, particularly useful for the direct reduction of iron ores.
  • It is another object of the present invention to provide a process and system for treating coke oven gas and producing a synthesis gas useful as raw material in chemical processes or for producing heat, steam, electricity or power avoiding the complex and expensive cleaning processes normally utilized in coking plants.
  • Other objects of the invention will be pointed out in this specification or will be evident to those skilled in the art.
    • SUMMARY OF THE INVENTION
  • The present invention provides a method of treating hot crude coke oven gas produced in coke ovens comprising: mixing said hot crude coke oven gas with an oxygen-containing gas in order to carry out a partial combustion of said coke oven gas producing a reducing gas having a high content of hydrogen and carbon monoxide at a temperature higher than about 1000° C.; passing said hot reducing gas through a heat exchanger in order to produce high temperature steam; utilizing a first portion of said steam to produce electricity; removing sulfur compounds and other impurities of said reducing gas in a sulfur removing unit; and utilizing a second portion of said steam in said sulfur removing unit.
  • In a preferred embodiment of the invention the method further includes an additional step of utilizing at least a portion of said clean reducing gas in a direct reduction plant comprising a direct reduction reactor, a CO2 removal unit and a gas heater.
  • In another preferred embodiment of the invention the method further includes the additional step of utilizing a third portion of said exhausted steam in said CO2 removal unit of said direct reduction plant.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic process diagram of a preferred embodiment of the invention.
  • FIG. 2 illustrates an example of the process showing, in a schematic process diagram similar to FIG. 1, values of process parameters.
  • FIG. 3 is a table supplementing the information of process streams shown in FIG. 2.
  • FIG. 4 also illustrates another example of the process showing, in a schematic process diagram of a direct reduction plant, values of process parameters operating according to the coke oven gas cleaning method of the invention.
    • DETAILED DESCRIPTION OF THE INVENTION
  • The invention will be described with reference to the accompanying drawings, it being understood that many changes and modifications may be made by those skilled in the art without departing from the spirit of the invention, which is defined by the appended claims.
  • With reference to FIG. 1, numeral 10 designates a battery of coke ovens, to which coal 12 is charged and heated therein by combustion of gases 14 and air 16. Coke 18 is discharged from ovens 10 in a manner known in the art and hot crude coke oven gas 20 is produced typically at a temperature of about 600° C. degrees to 700° C.
  • Hot crude coke oven gas 20 is then mixed with an oxygen-containing gas 22 which may be produced in an air separation plant 24 from air 26. The air separation plant 24 may be of the cryogenic or a PSA-type since the purity of oxygen is not critical for this application. The process may also operate with oxygen-enriched air, although the quality of the resulting reducing gas is affected by the amount of nitrogen from said air feed.
  • Hot crude coke oven gas 20 at a temperature of about 650° C. is subject to a partial combustion with oxygen 22 in combustion chamber 28 reaching temperatures above about 1000° C. At this temperature all organic compounds are converted into a high temperature reducing gas 30 mainly composed of a mixture of hydrogen and carbon monoxide, carbon dioxide, methane and water.
  • Reducing gas 30 is passed through a heat exchanger 32 where it heats steam 34 from steam drum 36 and super-heated steam 38 is utilized in turbine 40 to produce electricity in electric generator 42. Electricity is fed through line 44 and is used in air separation plant 24 to produce oxygen for the partial combustion of coke oven gas.
  • A first portion 50 of exhausted steam 46 from turbine 40 is used in sulfur separation unit 48 and a second portion 52 is used in the CO2 separation unit 54 of a direct reduction plant.
  • After passing through heat exchanger 32, the reducing gas is fed to a boiler 56 where steam 58 is produced from water 60 and is held in steam drum 36. From boiler 56, reducing gas 62 is finally quenched by direct contact with water in cooler 64. Condensed water is withdrawn through pipe 66. Cold reducing gas 68 is then fed to blower 70 and then led through pipe 72 to be treated in a sulfur removal unit 48 in a manner known in the art producing solid sulfur 74 and a stream of clean reducing gas 76.
  • A portion of the reducing gas 76 is used for heating the coke ovens through pipe 14 and another portion 78 is compressed in compressor 80 to be injected to the reduction gas loop of a direct reduction reactor 82. Iron oxides bearing particles 84, for example iron ore pellets, lumps or mixtures thereof, are fed to reduction reactor 82 and descend by gravity through said reactor where they are contacted with high temperature reducing gases 86, for example above 900° C. whereby iron oxides are reduced to metallic iron, known as DRI or sponge iron 88, and discharged from the lower part of the reduction reactor 82 to be utilized in steelmaking operations.
  • Reacted reducing gas 90 is withdrawn from reactor 82 and cooled down in cooler 92 where water is removed from the gas by condensation a portion of the cooled gas 94 is recycled to the reduction reactor and another portion 96 may be vented from the reduction loop and used for example in gas heater 98. The recycled reducing gas portion 94 is compressed in compressor 100 and fed to a carbon dioxide removal unit 54 where CO2 is removed from the system thus regenerating the reducing potential of the recycled gas by elimination of water 102 and CO2 104 which are the main products of the reduction reactions carried out in reactor 82.
    • EXAMPLE
  • A computer-model calculation of a plant incorporating the invention was made and the results are illustrated in FIGS. 2, 3 and 4. This example clearly shows the advantages of the invention regarding its application for obtaining a reducing gas for producing good-quality direct reduced iron.

Claims (7)

1. A method of treating hot crude coke oven gas from a coke oven to produce a clean reducing gas, comprising
partially combusting the hot crude coke oven gas at a temperature greater than about 1000° C. by mixing the hot crude coke oven gas with an oxygen-containing gas to produce a hot reducing gas having a high content of hydrogen and carbon monoxide;
producing high temperature steam by passing the hot reducing gas through a heat exchanger;
utilizing a first portion of the steam to produce electricity; and
utilizing a second portion of the steam in a sulfur removing unit to remove sulfur compounds and other impurities from the reducing gas to produce the clean reducing gas.
2. The method of claim 1, further comprising utilizing at least a portion of the clean reducing gas in a direct reduction plant comprising a direct reduction reactor, a CO2 removal unit and a gas heater.
3. The method of claim 2, further comprising utilizing a third portion of said steam in the CO2 removal unit of the direct reduction plant.
4. The method of claim 3, wherein the direct reduction plant is used to directly reduce iron ore.
5. The method of claim 2, wherein a portion of the clean reducing gas is used to heat the coke oven.
6. The method of claim 5, wherein another portion of the clean reducing gas is injected into the direct reduction reactor.
7. A method of reducing iron oxides in a shaft reduction reactor utilizing coke oven gas, comprising mixing hot crude coke oven gas with an oxygen-containing gas in order to carry out a partial combustion of said coke oven gas to produce a hot reducing gas having a high content of hydrogen and carbon monoxide at a temperature higher than about 1000° C.; passing said hot reducing gas through a heat exchanger in order to produce high temperature steam; utilizing a first portion of said steam in a sulfur removal unit for removing sulfur compounds and other impurities of said reducing gas; and utilizing a second portion of said steam in a CO2 removal unit where exhausted reducing gas is treated to remove carbon dioxide before being recycled into said shaft reduction reactor.
US11/194,578 2004-08-03 2005-08-02 Method and apparatus for producing clean reducing gases from coke oven gas Abandoned US20060027043A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/194,578 US20060027043A1 (en) 2004-08-03 2005-08-02 Method and apparatus for producing clean reducing gases from coke oven gas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59819704P 2004-08-03 2004-08-03
US11/194,578 US20060027043A1 (en) 2004-08-03 2005-08-02 Method and apparatus for producing clean reducing gases from coke oven gas

Publications (1)

Publication Number Publication Date
US20060027043A1 true US20060027043A1 (en) 2006-02-09

Family

ID=35429154

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/194,578 Abandoned US20060027043A1 (en) 2004-08-03 2005-08-02 Method and apparatus for producing clean reducing gases from coke oven gas

Country Status (5)

Country Link
US (1) US20060027043A1 (en)
CN (1) CN101023023B (en)
DE (1) DE112005001881T5 (en)
MX (1) MX2007001249A (en)
WO (1) WO2006013455A1 (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008141839A2 (en) * 2007-05-24 2008-11-27 Lurgi Gmbh Method and device for the treatment of product gas produced by pressure gasification of solid fuels
US20120217148A1 (en) * 2009-09-22 2012-08-30 Thyssenkrupp Uhde Gmbh Method for operating a coke oven arrangement
WO2013093640A3 (en) * 2011-12-21 2013-12-27 Hyl Technologies, S.A. De C.V. Method and apparatus for production of direct reduced iron (dri) utilizing coke oven gas
CN103525966A (en) * 2013-10-08 2014-01-22 中国石油大学(北京) Method for producing gas-based directly reduced iron by utilizing catalytic conversion of natural gas, and system thereof
CN103525964A (en) * 2013-10-08 2014-01-22 中国石油大学(北京) Method for producing gas-based directly reduced iron by utilizing catalytic conversion of coke-oven gas, and system thereof
US20140083252A1 (en) * 2011-05-30 2014-03-27 Siemens Vai Metals Technologies Gmbh Reduction of metal oxides using gas stream containing both hydrocarbon and hydrogen
US20140260803A1 (en) * 2011-08-20 2014-09-18 Danieli & C. Officine Meccaniche, S.P.A. Process for producing direct reduced iron (dri) utilizing gases derived from coal
TWI456070B (en) * 2011-05-13 2014-10-11 Midrex Technologies Inc System and method for reducing iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas
WO2015086148A1 (en) * 2013-12-12 2015-06-18 Thyssenkrupp Ag Method for reducing co2 emissions in the operation of a metallurgical plant
WO2015086154A1 (en) * 2013-12-12 2015-06-18 Thyssenkrupp Ag Plant combination for producing steel and method for operating the plant combination
WO2015086153A1 (en) * 2013-12-12 2015-06-18 Thyssenkrupp Ag Combined system for producing steel and method for operating the combined system
WO2015015317A3 (en) * 2013-07-22 2015-08-13 Saudi Basic Industries Corporation Use of top gas in direct reduction processes
WO2016011122A1 (en) * 2014-07-15 2016-01-21 Midrex Technologies, Inc. Methods and systems for producing direct reduced iron and steel mill fuel gas
US20160115412A1 (en) * 2013-05-30 2016-04-28 Clean Coal Technologies, Inc. Treatment of coal
CN106241736A (en) * 2016-08-03 2016-12-21 西南化工研究设计院有限公司 A kind of technique utilizing coke-stove gas extraction metallurgy reducing gases
RU2661688C1 (en) * 2013-12-12 2018-07-19 Тиссенкрупп Аг Method for generating synthesis gas in conjunction with a smelting plant
RU2710492C1 (en) * 2013-12-12 2019-12-26 Тиссенкрупп Аг Production steel complex and operating method of production complex
US10781498B2 (en) 2013-12-12 2020-09-22 Thyssenkrupp Ag Combined system for producing steel and method for operating the combined system
JP2021512598A (en) * 2018-02-12 2021-05-20 ランザテク，インコーポレイテッド Processes for improving carbon conversion efficiency
CN114574648A (en) * 2020-12-02 2022-06-03 北京京诚泽宇能源环保工程技术有限公司 System and method for preparing reducing gas of gas-based shaft furnace

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112012002266A2 (en) * 2009-07-31 2017-08-08 Danieli Off Mecc "method and apparatus for producing direct reduced iron in a direct reduction system"
JP5495749B2 (en) 2009-12-10 2014-05-21 三菱重工業株式会社 Hydrogen production facility and power plant
CN101871031B (en) * 2010-06-01 2011-08-03 中国石油大学(北京) Method and equipment for preparing reducing gas from coke oven gas to produce sponge iron
IT1402250B1 (en) * 2010-09-29 2013-08-28 Danieli Off Mecc PROCEDURE AND EQUIPMENT FOR THE PRODUCTION OF DIRECT REDUCTION IRON USING A REDUCING GAS SOURCE INCLUDING HYDROGEN AND CARBON MONOXIDE
CN103525965B (en) * 2013-10-08 2015-12-02 中国石油大学(北京) Coke(oven)gas on-catalytic is utilized to transform the method and system of producing gas base directly reducing iron
CN103834760B (en) * 2014-02-25 2016-02-17 中国石油大学(北京) A kind of method and device utilizing coal mine gas preparing synthetic gas production reduced iron
WO2018128682A2 (en) * 2016-11-03 2018-07-12 Midrex Technologies, Inc. Direct reduction with coal gasification and coke oven gas
JP7533321B2 (en) * 2021-03-31 2024-08-14 Ｊｆｅスチール株式会社 Method and apparatus for producing reduced iron

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235624A (en) * 1977-07-27 1980-11-25 Didier Engineering Gmbh Method for processing coke oven gas

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2638348A1 (en) * 1976-08-26 1978-07-13 Didier Eng PROCESS FOR PROCESSING COOKING GAS
DE2700044A1 (en) * 1977-01-03 1978-07-06 Didier Eng METHOD FOR PREVENTING CONDENSATION DURING THE TRANSPORT OF HOT COOKING RAW GASES TO THE APPLICATION POINT
IE63440B1 (en) * 1989-02-23 1995-04-19 Enserch Int Investment Improvements in operating flexibility in integrated gasification combined cycle power stations
US6149859A (en) * 1997-11-03 2000-11-21 Texaco Inc. Gasification plant for direct reduction reactors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235624A (en) * 1977-07-27 1980-11-25 Didier Engineering Gmbh Method for processing coke oven gas

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008141839A3 (en) * 2007-05-24 2009-01-15 Lurgi Gmbh Method and device for the treatment of product gas produced by pressure gasification of solid fuels
US20110126542A1 (en) * 2007-05-24 2011-06-02 Lurgi Gmbh Method and device for the treatment of product gas produced by pressure gasification of solid fuels
AU2008253245B2 (en) * 2007-05-24 2012-08-30 Lurgi Clean Coal Technology (Proprietary) Limited Method and device for the treatment of product gas produced by pressure gasification of solid fuels
RU2475515C2 (en) * 2007-05-24 2013-02-20 Лурджи Клин Коул Текнолоджи (Пропрайэтри) Лимитед Method and equipment for processing gas obtained by pressure gasification of solid fuel
US8500866B2 (en) 2007-05-24 2013-08-06 Lurgi Clean Coal Technology (Proprietary) Limited Method and device for the treatment of product gas produced by pressure gasification of solid fuels
WO2008141839A2 (en) * 2007-05-24 2008-11-27 Lurgi Gmbh Method and device for the treatment of product gas produced by pressure gasification of solid fuels
KR101458244B1 (en) 2007-05-24 2014-11-04 러지 클린 콜 테크놀로지 (피티와이) 리미티드 Method and device for the treatment of product gas produced by pressure gasification of solid fuels
US20120217148A1 (en) * 2009-09-22 2012-08-30 Thyssenkrupp Uhde Gmbh Method for operating a coke oven arrangement
TWI456070B (en) * 2011-05-13 2014-10-11 Midrex Technologies Inc System and method for reducing iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas
US20140083252A1 (en) * 2011-05-30 2014-03-27 Siemens Vai Metals Technologies Gmbh Reduction of metal oxides using gas stream containing both hydrocarbon and hydrogen
US9546409B2 (en) * 2011-08-20 2017-01-17 Hyl Technologies, S.A. De C.V. Process for producing direct reduced iron (DRI) utilizing gases derived from coal
US20140260803A1 (en) * 2011-08-20 2014-09-18 Danieli & C. Officine Meccaniche, S.P.A. Process for producing direct reduced iron (dri) utilizing gases derived from coal
JP2015507088A (en) * 2011-12-21 2015-03-05 エイチワイエル テクノロジーズ、エス．エー． デ シー．ヴイ Method and apparatus for direct reduced iron (DRI) production using coke oven gas
WO2013093640A3 (en) * 2011-12-21 2013-12-27 Hyl Technologies, S.A. De C.V. Method and apparatus for production of direct reduced iron (dri) utilizing coke oven gas
US9725778B2 (en) 2011-12-21 2017-08-08 Hyl Technologies, S.A. De C.V. Method and apparatus for production of direct reduced iron (DRI) utilizing coke oven gas
US10519390B2 (en) * 2013-05-30 2019-12-31 Clean Coal Technologies, Inc. Treatment of coal
US20160115412A1 (en) * 2013-05-30 2016-04-28 Clean Coal Technologies, Inc. Treatment of coal
US10260117B2 (en) 2013-07-22 2019-04-16 Saudi Basic Industries Corporation Use of top gas in direct reduction processes
WO2015015317A3 (en) * 2013-07-22 2015-08-13 Saudi Basic Industries Corporation Use of top gas in direct reduction processes
CN103525964A (en) * 2013-10-08 2014-01-22 中国石油大学(北京) Method for producing gas-based directly reduced iron by utilizing catalytic conversion of coke-oven gas, and system thereof
CN103525966A (en) * 2013-10-08 2014-01-22 中国石油大学(北京) Method for producing gas-based directly reduced iron by utilizing catalytic conversion of natural gas, and system thereof
RU2710492C1 (en) * 2013-12-12 2019-12-26 Тиссенкрупп Аг Production steel complex and operating method of production complex
RU2709323C1 (en) * 2013-12-12 2019-12-17 Тиссенкрупп Аг Complex of plants for steel making and method of operating complex of plants
CN105960469A (en) * 2013-12-12 2016-09-21 蒂森克虏伯股份公司 Combined system for producing steel and method for operating the combined system
EP4039830A1 (en) * 2013-12-12 2022-08-10 Thyssenkrupp AG Plant combination for producing steel and method for operating the plant combination
US10781498B2 (en) 2013-12-12 2020-09-22 Thyssenkrupp Ag Combined system for producing steel and method for operating the combined system
RU2661688C1 (en) * 2013-12-12 2018-07-19 Тиссенкрупп Аг Method for generating synthesis gas in conjunction with a smelting plant
RU2670822C1 (en) * 2013-12-12 2018-10-25 Тиссенкрупп Аг Combined system for producing steel and method for operating combined system
RU2670822C9 (en) * 2013-12-12 2018-11-29 Тиссенкрупп Аг Combined system for producing steel and method for operating combined system
AU2014361209B2 (en) * 2013-12-12 2019-03-07 Thyssenkrupp Ag Plant combination for producing steel and method for operating the plant combination
WO2015086153A1 (en) * 2013-12-12 2015-06-18 Thyssenkrupp Ag Combined system for producing steel and method for operating the combined system
RU2693980C2 (en) * 2013-12-12 2019-07-08 Тиссенкрупп Аг Method for reducing co2 emissions in operation of metallurgical plant
US10697030B2 (en) 2013-12-12 2020-06-30 Thyssenkrupp Ag Plant combination for producing steel and method for operating the plant combination
WO2015086154A1 (en) * 2013-12-12 2015-06-18 Thyssenkrupp Ag Plant combination for producing steel and method for operating the plant combination
WO2015086148A1 (en) * 2013-12-12 2015-06-18 Thyssenkrupp Ag Method for reducing co2 emissions in the operation of a metallurgical plant
US10604816B2 (en) 2013-12-12 2020-03-31 Thyssenkrupp Ag Combined system for producing steel and method for operating the combined system
US10697031B2 (en) 2013-12-12 2020-06-30 Thyssenkrupp Ag Combined system for producing steel and method for operating the combined system
US10697032B2 (en) 2013-12-12 2020-06-30 Thyssenkrupp Ag Method for generating synthesis gas in conjunction with a smelting works
US9938594B2 (en) 2014-07-15 2018-04-10 Midrex Technologies, Inc. Methods and systems for producing direct reduced iron and steel mill fuel gas using coke oven gas and basic oxygen furnace gas
WO2016011122A1 (en) * 2014-07-15 2016-01-21 Midrex Technologies, Inc. Methods and systems for producing direct reduced iron and steel mill fuel gas
CN106241736A (en) * 2016-08-03 2016-12-21 西南化工研究设计院有限公司 A kind of technique utilizing coke-stove gas extraction metallurgy reducing gases
JP2021512598A (en) * 2018-02-12 2021-05-20 ランザテク，インコーポレイテッド Processes for improving carbon conversion efficiency
US11359294B2 (en) * 2018-02-12 2022-06-14 Lanzatech, Inc. Process for improving carbon conversion efficiency
JP7273834B2 (en) 2018-02-12 2023-05-15 ランザテク，インコーポレイテッド A process for improving carbon conversion efficiency
CN114574648A (en) * 2020-12-02 2022-06-03 北京京诚泽宇能源环保工程技术有限公司 System and method for preparing reducing gas of gas-based shaft furnace

Also Published As

Publication number Publication date
CN101023023A (en) 2007-08-22
MX2007001249A (en) 2007-03-23
CN101023023B (en) 2012-12-26
DE112005001881T5 (en) 2007-06-21
WO2006013455A1 (en) 2006-02-09

Similar Documents

Publication Publication Date Title
US20060027043A1 (en) Method and apparatus for producing clean reducing gases from coke oven gas
US20220235426A1 (en) Method and system for producing steel or molten-iron-containing materials with reduced emissions
EP2798293B1 (en) Method of producing molten iron in a blast furnace with top-gas recycle
RU2643007C2 (en) Reduction of iron oxide to metallic iron using natural gas
US8377168B2 (en) Method for the direct reduction of iron oxides to metallic iron utilizing coke oven gas or the like
KR101551887B1 (en) System and method for reducing iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas
JP5857054B2 (en) Method and apparatus for directly producing reduced iron using a reducing gas containing hydrogen and carbon monoxide as a supply source
EP3027778B1 (en) Reduction of iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas
CN102037145B (en) Method for melting raw iron while recirculating blast furnace gas by adding hydrocarbons
EP2794932B1 (en) Method and plant for production of direct reduced iron (dri) utilizing coke oven gas
CN102712959A (en) Method for producing direct reduced iron with limited CO2 emissions
TWI803522B (en) Method for producing hot synthesis gas, in particular for use in blast furnace operation
CN104017923A (en) Ironmaking method and ironmaking furnace system
CA2563375A1 (en) Method and apparatus for gasifying waste automotive tires to produce high quality solid carbon and non-condensable synthesis gas
US20190048429A1 (en) Method and system for the production of porous iron
KR101254977B1 (en) Apparatus and Method for Treating Coke Oven Gas
JP5860469B2 (en) Method and equipment for producing coke during indirect heating gasification
KR20240041974A (en) How to make iron melt
CN113825845B (en) Method for operating a metallurgical furnace

Legal Events

Date Code Title Description
AS Assignment

Owner name: HYLASA S.A. DE C.V., MEXICO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZENDEJAS-MARTINEZ, EUGENIO;REEL/FRAME:016833/0122

Effective date: 20050801

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION