CO2 lean reduction of iron ore by use of green methanol

Not scheduled
15m
Oral Presentation CO2 Reduction and environmental aspects in the DRI industry

Speaker

Dr Guenter Harp (Harp Process Chemistry Consulting)

Description

CO2 lean making of DRI needs normally a combination of natural gas and CCS or green hydrogen as reductant. The properties of methanol makes it an ideal reductant for DRI production. Methanol contains about 12.5 % hydrogen and is after NH3 the best hydrogen storage material. The hydrogen content corresponds to a hydrogen density at a pressure of more than 1000 bar. It is liquid with a boiling temperature of about 65°C, which means that it can be vaporized with hot water. Catalytic steam reforming of methanol lead at about 200°C to conversion in accordance with the following equation: CH3OH +H2O = 3 H2 + CO2 It is an endothermal reaction which can be done at moderate pressure with the assistance of waste heat, which is available within the steel mills process chain. Catalysts for that reaction are the same as for the reverse reaction of hydrogenation of CO2 to methanol. On raising the temperature to about 350°C the methanol is decomposed into H2 and CO in accordance with the following equation: CH3OH = 2 H2 + CO That reaction is catalyzed by a so called high temperature water gas shift catalyst which are based on the element iron. It is also an endothermic reaction with a so called chemical recuperation, which means the transfer of heat into chemical energy. This reaction is predestinated for cooling the hot DRI transferring the methanol into a reducing gas for the pellet reduction in the upper shaft. Liquid methanol is easy transportable, needs low storage volume. Green methanol is made out of biomass or the Power to Liquid (PtL) technology. That should be preferably done in countries with low cost renewable energy based on solar power like e.g. North Africa, the Arabian peninsula, Australia, Chile, or Namibia. A closed CO2 cycle can be built on returning the CO2 from the methanol carbon via known carbon capture and transport as liquid. Based on the production route for green methanol at low electricity price it will be shown that a methanol based reduction of iron ore using the shaft furnace technology is applicable without the need of a hydrogen pipeline and cavern infrastructure, which does not exist in Europe at a sufficient scale.
Speaker Country Germany

Primary author

Dr Guenter Harp (Harp Process Chemistry Consulting)

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