Results showed that sponge iron acts as a catalyst 050 and methane conversion is increased in higher temperatures and with higher H. 2/H. 2O ratio in the inlet gas. The inlet gas composition like one of the industrial auto-reforming processes led to intense carburization and hindered the catalytic reforming reaction.
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· Sponge iron means porous iron produced by direct reduction process.Direct reduction (DR) process is a solid-state reaction process (i.e. solid–solid or solid–gas reaction) by which removable oxygen is removed from the iron ore, using coal or reformed natural gas as reductants, below the melting and fusion point of the lump ore or
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Abstract. Hydrogen-based direct reduction is the most promising technology for CO2-neutral steelmaking. The gas-solid reduction reactions characterize these aggregates, producing sponge or direct reduced iron (DRI) consisting of metallic iron, residual iron oxide, and gangue. That is in contrast to the blast furnace (BF), which simultaneously
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Fig. 1 Schematic flow sheet of coal based direct reduction process[1] Fig. 2 Typical 3-D image of accretions in Kiln 3 at TATA sponge, developed from the model which uses inputs thermocouple
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In the present work, an effort is made for best utilization of waste heat to reduce energy requirements in sponge iron plants. For this purpose, based on the principles of process integration
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· Energy balance of coal-based sponge iron production (Business as usual) (This figure depicts the consumption, recovery, and loss of energy fed to the rotary kiln across each sub-units of sponge iron production process).
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DRI, also known as sponge iron, is the product of reducing iron oxide in the form of iron ore and steel plant wastes into metallic iron, below the melting point of iron and typically in the range of 800–1200 °C. Iron oxide is charged into shaft furnace, rotary kiln, or fluidized beds in the form of pellet, iron ore lumps, or fines.
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· Borah and others published Operation of Coal-Based Sponge Iron Rotary Kiln to Reduce Accretion the gas composition at the diffuse iron-wustite interface is within 10 to 20 pct of that for the
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· In the present work, an effort is made for best utilization of waste heat to reduce energy requirements in sponge iron plants. For this purpose, based on the principles of process integration, three design modifications, scheme-1, scheme-2, and scheme-3, are proposed and applied on actual data of two sponge iron plants being
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· Reducing gases are produced from natural gas (gas-based DRI) or coal (coal-based DRI) called syngas, a mixture of H 2 and CO. Although DRI production is more energy efficient than pig iron production from BF, additional processing (typically EAF) is needed to upgrade DRI sponge iron for market.
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· Natural gas / coal Total iron % Around 96 Around 92 Iron oxide % 1 max. Around 7 to 8 Gangue and impurities % Around 1 Around 5 ensity / porosity High /low Low / high Carbon % 4 % min. 1.5 – 4 for gas based DRI, 0.1 –
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Direct Reduced Iron (DRI) is the product of the direct reduction of iron ore in the solid state by carbon monoxide and hydrogen derived from natural gas or coal. See more information about the production of DRI . Most gas-based direct reduction plants are part of integrated steel mini-mills, located adjacent to the electric arc furnace (EAF
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23 For coal-based and gas-based DRI production, electricity takes 8% of the total energy consumption (17.9 gigjoules (GJ)/ton and 14.1 GJ/ton respectively), or 380 kWh/t production for coal-based
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Gas cleaning processes James G. Speight Ph.D., D.Sc., in Natural Gas (Second Edition), 20198.5.1 Iron sponge process An example of a hydrogen sulfide scavenger process is the iron sponge process (also called the dry box process), which is the oldest and still the most widely used batch process for sweetening of natural gas and natural gas liquids
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:Sponge Iron IndustryPublish Year:2011Sponge Iron is produced when Iron Ore along with other feed materials like dolomite and coal are fed inside the DRI Kiln at a high temperature of about 1070° C [4] [1]. Here Coal
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calculated as 925.90 MJ and 41.74% per tonne of sponge iron, respectively. Exergy destroyed and exergy efficiency increase with the introduction of post-combustion in reduction zone.
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FEFF0041006C007400650072006E006100740065002000690072006F006E006D0061006B0069006E0067002000700072006F006300650073007300650073-CDEEP-IIT Bombay
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23 For coal-based and gas-based DRI production, electricity takes 8% of the total energy consumption (17.9 gigjoules (GJ)/ton and 14.1 GJ/ton respectively), or 380 kWh/t production for coal-based
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· Sponge iron is a raw material used to produce steel. It is also known as direct reduced iron (DRI). It is produced by directly reducing an iron ore pellet or lump in a solid state using a reducing gas. The reducing gas can be made from natural gas, coal, or hydrogen. The DRI is cheaper than pig iron, and it is less polluting.
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· Gas-Based Direct Reduction Ironmaking. A gas is used as reductant to reduce iron oxides into iron metal in certain temperature. The reducing gas is produced by using natural gas or petroleum as energy source and oxidizing gas (CO 2 or H 2 O) or oxygen as oxidant. Hydrocarbon is decomposed and converted through catalytic
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Established sponge iron processes like Midrex, HYL III and rotary kiln are now facing competition from several new production processes. 8 new process concepts have been suggested, most of them have been tested on a pilot scale, and decisions have been taken to erect production units based on 4 of these. To that should be added plants for
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Reduces electricity consumption (20 kWh per tonne liquid steel for each 100°C increase in DRI charging temperature). Shorter overall melting cycle, resulting in reduction in
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· Purpose Despite its sizeable role in the global economy, the steel industry is also one of the world’s largest energy consumers and a significant source of greenhouse gas emissions. Iran is one of the world’s top ten steel producers, with over 77% of its steel produced in electric arc furnaces (EAF). As a result, a thorough impact assessment is
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· The present work investigates the design modifications which can lead to efficient energy integration in coal-based sponge iron plant with a capacity of 500 t/day. For the present energy integration investigations, two scenarios: 1 and 2 are proposed and compared with the existing one. During the operation in coal-based sponge iron plant, a
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· and the reduction of iron ore can reduce direct CO emissions by as much as 85%, but would require an H procurement cost of $1.63 per kg H or less. When. using H only for iron ore reduction
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:Direct Reduction Using CoalConsumption Reduction of Iron ResourcesBased on this scenario, the objective of the present work is to measure the conversion of methane on steam reforming reaction catalyzed by sponge iron, under conditions like
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It was found that exergy utilisation efficiency of RHF-EAF steelmaking process based on both products steel and total by-product fuel gas for hot charging of direct reduced iron (DRI) above 600 C
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b s t r a c t. survey is made on a typical coal based Indian sponge iron plant of capacity 500 t/d in order to identify the largest energy losses and find ways to increase the efficiency. The
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· Sponge Iron, (capacity 0. 09 MTPA) and S unflag Iro n Steel Ltd. The first gas based sponge iron. plant (capacity of 1.52 MTPA) was setup by Essar Steel Limited in Hazira, Gujarat in 1990 2. The
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· Iron Sponge. The iron sponge process uses the chemical reaction of ferric oxide with H2S to sweeten gas streams. This process is applied to gases with low H2S concentrations (300 ppm) operating at low to moderate pressures (50-500 psig). Carbon dioxide is not removed by this process.
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Trituradora de piedra vendida por proveedores certificados, como trituradoras de mandíbula/cono/impacto/móvil, etc.
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