Name
Techno-Economic Analysis of blast furnace gas utilisation with Calcium Assisted Steel-mill Off-gas Hydrogen production (CASOH) technology
Date & Time
Wednesday, October 2, 2024, 9:00 AM - 9:20 AM
Description

Calcium looping has been extensively investigated for its potential in post-combustion CO2 capture from power plants and has also been suggested as a viable approach for hydrogen production in reforming processes. However, a limitation of calcium looping is the cost associated with regenerating CaCO3, which requires temperatures above 850°C. A potential alternative is the integration of calcium and chemical looping utilising a copper-based oxygen carrier, to decrease the energy requirements of calcination through the exothermic reduction of CuO with gaseous fuel. Calcium Assisted Steel-mill Off-gas Hydrogen production (CASOH) is an innovative configuration that incorporates Ca-Cu looping. CASOH comprises three steps (i.e., CASOH reaction, oxidation, and regeneration) and has been successfully applied to decarbonise blast furnace gas (BFG). In this work, an enhanced configuration of the CASOH process (CASOH-E), including a calcination step, is evaluated and compared to the CASOH and the benchmark MDEA processes for the decarbonisation of BFG. Aspen Plus V11 is used to obtain mass and energy flows, and relevant performance indicators, i.e., CO2 capture efficiency and energy consumption, are calculated to compare the technologies. Results show that CO2 capture efficiency is highest in CASOH-E (91.5%), with the additional calcination step facilitating the production of a sufficiently pure CO2 stream (99.4%) to avoid a purification system. However, power consumption is highest in CASOH-E due to the additional calcination step and the higher demand of compression power, while 135.9 MW of thermal energy are produced in CASOH. These results show the potential of CASOH technologies to decarbonise BFG.

Location Name
Max Bell 253
Full Address
Banff Centre for Arts and Creativity
107 Tunnel Mountain Dr
Banff AB T1L 1H5
Canada
Session Type
Oral Presentation
Abstract ID
1119