A new pathway to produce hydrogen with COx capture from blast furnace gas via SOFC-SOEC integration. (1st November 2022)

• Record Type: Journal Article
• Authors: Kong, Rui; Zhang, Rongjun; Li, Hongwei; Wu, Yu; Sun, Zhao; Sun, Zhiqiang
• Is Part Of: Energy conversion and management. Volume 271(2022)
• Publication Date: 2022-11-01
• Subjects: Blast furnace gas -- Hydrogen production -- COx capture -- SOFC -- SOEC; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2022.116278
• Languages: English
• ISSNs: 0196-8904

Abstract

Graphical abstract: Highlights: A BF-SOFC-SOEC integrated system was proposed for efficient utilization of BFG. Feasibility validation and parameter optimization were thermodynamically provided. High-quality hydrogen can be obtained with the achievement of CO x capture. Carbon oxides capture rate can be significantly promoted by feeding pure oxygen. Strategies for clean, efficient, and low-carbon BFG conversion were put forward. Abstract: As a low calorific value fuel, blast furnace gas (BFG) is worthy of utilization in a clean, efficient, and low-carbon manner. In this study, a new approach that can achieve value-added recycling of BFG, BFG → SOFC-SOEC → H2, is put forward with hydrogen production and carbon oxides capture. The system mainly consists of blast furnace (including upper, middle, and lower units), SOFC, and SOEC modules, which can convert low-grade chemical energy of BFG into electricity and then into hydrogen. Feasibility verification and parameter optimization of the proposed system is conducted using ASPEN Plus software. The effects of C and CaCO3 feeding rates, blast furnace temperature, air flow rate, and O2 flow rate are comprehensively investigated. Results indicate the feasibility of integrating SOFC with SOEC for value-added hydrogen production. Moreover, carbon oxides capture efficiency of 99.92 %, BFG lower heating value of 2209 kcal/m 3, SOFC efficiency of 61.1 %, SOFC power of 65 kW, and H2 production rate of 0.24 kmol/kmol·BFG can be obtained under the conditions of C/CaCO3 = 42.6 and oxygen feeding rate = 11.58 kmol/ton·ore. These findings provide valid strategies for BFG-to-hydrogen production with CO x capture via SOFC-SOEC integration, which may substantially promote the low-carbon BFG conversion and diversified utilization.