The Proceedings of the International Conference on Power Engineering (ICOPE)
Online ISSN : 2424-2942
2015.12
Session ID : ICOPE-15-1038
Conference information
ICOPE-15-1038 Quantitative Evaluation of CO_2 Emission Reduction and Energy Conservation in Iron Making Process by Using In-plant CO Recycling System
Katsuki SUZUKITakao NAKAGAKIIkuhiko SUMIJun ISHII
Author information
CONFERENCE PROCEEDINGS FREE ACCESS

Details
Abstract
Japanese iron and steel manufacturing industries import a significant amount expensive coking coal (coke); reduction of coke consumption is a great challenge for the industry. In this paper, we propose an in-plant CO recycling system which supplements coke with gaseous CO as a reducing agent in the blast furnace. Process flow diagrams including a blast furnace with CO recycling, coke oven, and hot blast stove were built in Aspen Plus and the effect of CO recycling on coal conservation, exergy efficiency, and CO_2 emission were quantitatively evaluated. In the blast furnace the input exergy, effective exergy ratio, overall CO_2 emissions, and the input coke decreased as the degree of CO circulation was increased. The recirculated CO gas was separated from the Blast Furnace Gas (BFG), the coke oven gas, and the converter gas. The separation and recycling of CO into the blast furnace resulted in the decrease of input coke, and input exergy by 13.0% and 10.3%, respectively. On the other hand, overall CO_2 emissions increased by 2.6%
Content from these authors
© 2015 The Japan Society of Mechanical Engineers
Previous article Next article
feedback
Top