Reducing Gas - Coal (MXCOL™)
MXCOL™ refers to the use of a syngas made from coal in a MIDREX® Plant.
Gasifier Syngas
Commercially available gasification technology can now be paired with a MIDREX Plant to produce DRI. The designs include gas-cleaning and conditioning systems to provide a reducing gas suitable for direct reduction. After cleaning and conditioning, the gas is reheated to the proper temperature and introduced to the shaft furnace.
After scrubbing and CO2 removal, the offgas is recycled with fresh syngas. As with other gasification applications, the feedstock can be coal or other solid or liquid carbonaceous materials.
COREX® Offgas
The world’s first application of coal gasification to produce DRI in a MIDREX Plant started up in 1999 at ArcelorMittal Steel South Africa (formerly Saldanha Steel). This facility includes a COREX® Plant, supplied by Siemens VAI, which uses a melter/gasifier to simultaneously produce pig iron and a by-product synthesis gas that feeds a MIDREX MEGAMOD® Shaft Furnace.
Coke Oven Gas
Coke ovens produce coke for use in blast furnaces and generate an offgas containing CO and H2 and CH4. This gas is used typically for heating applications and production of electricity. With the proper conditioning, the gas can be used for direct reduction in a MIDREX Plant. In some cases, production of DRI has been shown to yield more attractive economics than generation of electricity.
Why Gasification?
Gasification refers to the reaction of coal or other solid or liquid carbonaceous feedstock with oxygen to produce a synthesis gas or syngas. As opposed to combustion, in which excess air or oxygen produces carbon dioxide (CO2) and water, gasification uses lesser amounts of air or oxygen to produce carbon monoxide (CO) and hydrogen.
The benefit is that it produces very high quality syngas regardless of the quality of the fuel. Sulfur, water, ash and other contaminants present in the fuel can be removed downstream of the gasifier to provide a syngas that can be used for electricity generation, chemicals or direct reduction. Possible feedstocks include coal, lignite, pet coke and other petroleum refinery bottoms. As energy costs rise, gasification enables the use of lower quality coals or waste products to produce energy.
There are three general types of gasifiers: entrained flow, fixed bed and fluidized bed. The entrained flow and fixed bed technologies are the most commonly used. Gasification of coal and other solid carbonaceous fuels has been practiced for well over 50 years and there are now over 200 gasifiers operating worldwide.
Commercially available gasification technology can now be paired with a MIDREX Plant to produce DRI. The designs include gas-cleaning and conditioning systems to provide a reducing gas suitable for direct reduction. After cleaning and conditioning, the gas is reheated to the proper temperature and introduced to the shaft furnace.
After scrubbing and CO2 removal, the offgas is recycled with fresh syngas. As with other gasification applications, the feedstock can be coal or other solid or liquid carbonaceous materials.
COREX® Offgas
The world’s first application of coal gasification to produce DRI in a MIDREX Plant started up in 1999 at ArcelorMittal Steel South Africa (formerly Saldanha Steel). This facility includes a COREX® Plant, supplied by Siemens VAI, which uses a melter/gasifier to simultaneously produce pig iron and a by-product synthesis gas that feeds a MIDREX MEGAMOD® Shaft Furnace.
Coke Oven Gas
Coke ovens produce coke for use in blast furnaces and generate an offgas containing CO and H2 and CH4. This gas is used typically for heating applications and production of electricity. With the proper conditioning, the gas can be used for direct reduction in a MIDREX Plant. In some cases, production of DRI has been shown to yield more attractive economics than generation of electricity.
Why Gasification?
Gasification refers to the reaction of coal or other solid or liquid carbonaceous feedstock with oxygen to produce a synthesis gas or syngas. As opposed to combustion, in which excess air or oxygen produces carbon dioxide (CO2) and water, gasification uses lesser amounts of air or oxygen to produce carbon monoxide (CO) and hydrogen.
The benefit is that it produces very high quality syngas regardless of the quality of the fuel. Sulfur, water, ash and other contaminants present in the fuel can be removed downstream of the gasifier to provide a syngas that can be used for electricity generation, chemicals or direct reduction. Possible feedstocks include coal, lignite, pet coke and other petroleum refinery bottoms. As energy costs rise, gasification enables the use of lower quality coals or waste products to produce energy.
There are three general types of gasifiers: entrained flow, fixed bed and fluidized bed. The entrained flow and fixed bed technologies are the most commonly used. Gasification of coal and other solid carbonaceous fuels has been practiced for well over 50 years and there are now over 200 gasifiers operating worldwide.
