Carbon dioxide to UREa
The transition from fossil based energy system to one that is dominated by renewable electricity generation creates major challenges. Still, the steel industry will continue to emit CO2 due to fundamental constraints. Financial interesting options for the use of CO2 are required.
In CURE, an exploration into the business case of the conversion of hydrogen from renewable electricity with CO2 from the steel industry is performed. The potential of this approach towards both the flexibility of the energy system and to the reduction of fossil fuel and concomitant CO2 footprint will be assessed.
Within CURE, conventional routes for the generation of synthesis gas, based on fossil fuels will be compared to alternative routes that can be designed for the two main gaseous side streams in the steel industry, namely blast furnace gas and basic oxygen furnace gas. Those gases are distinct in composition especially in CO to CO2ratio. As result, variable quantities of renewably produced hydrogen can be accommodated by using a continuous readjustment of the ratio between those two gases. A reactive pressure swing adsorption process called sorption enhanced water gas shift is likely to be able to accommodate the concomitant fluctuations, to convert the CO into H2, and to perform the required gas separations.
The CURE project will result in an assessment of:
• a first high level cost comparison for promising value added chemicals
• the flexibility of the SEWGS process towards changing gas compositions.