EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

The generation of renewable electrical energy will not fulfil the electrical energy consumption at any time. Therefore there will be “surplus” electrical energy in the electrical energy system that must be used to gain grid stability. The PtL technology consumes that “surplus” electrical energy and incorporates simultaneously the substantial usage of CO2 as feedstock for its conversion to methanol or liquid fuels via MTG or FT process. CO2 based methanol production in accordance with the PtL concept is realized in Iceland by Carbon Recycling International. Feedstock is CO2 from the geothermal steam of a nearby power station and H2 from water electrolysis by means of renewable electrical energy. Integrated steel mills are industrial parks with coke-, iron and steel making. Their process gases are coke oven gas (COG), blast furnace gas (BFG), and converter gas (BOFG). COG contains more than 60 % H2 and BFG more than 20% CO2. They are used within the steel production chain for heating purposes as well as for power generation to become energetically selfsufficient. Extracting CO2 out of BFG and converting it to methanol lead to CO2 emission avoidance in the gas combustion processes within the steel mill. It will be shown that the profitability of the PTL application will be enhanced in terms by combining it with the use of industrial by-product hydrogen to an extended PtL application. That will be demonstrated exemplary by its use within the environment of an integrated steel mill showing symbiosis between chemistry and steel industry. Beneficial for that are 1. The availability of substantial amounts of unused low temperature heat sources for covering the energy demand of the CO2 supply and methanol distillation, 2. the demand of substantial amounts of oxygen for the blast furnace as well as the converter process, and 3. the use of process heat via the steel mills steam grid.