Carbon monoxide production using a steel mill gas in a combined chemical looping process

作     者：Varun Singh Lukas C.Buelens Hilde Poelman Mark Saeys Guy B.Marin Vladimir V.Galvita Varun Singh;Lukas C.Buelens;Hilde Poelman;Mark Saeys;Guy B.Marin;Vladimir V.Galvita

作者机构：Laboratory for Chemical TechnologyTechnologiepark 125B-9052 GhentBelgium 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第5期

页      面：811-825页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financial support from the project Cabon4PUR which has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 768919 support of Dr. Alessandro Longo for Rietveld refinement of XRD support of the Wim Rogiers and Micha?l Lottin at the LCT for the fixed bed reactor setup used for experimental validation of the process concept 

主　　题：Steel industry CO_(2)capture Calcium oxide CO_(2)sorbent Reverse water gas shift Circular economy Process intensification 

摘      要：Up to 9% of the global CO_(2) emissions come from the iron and steel industry. Here, a combined chemical looping process to produce CO, a building block for the chemical industry, from the CO_(2) -rich blast furnace gas of a steel mill is proposed. This cyclic process can make use of abundant Fe_(3)O_(4) and CaO as solid oxygen and CO_(2) carriers at atmospheric pressure. A proof of concept was obtained in a laboratory-scale fixed bed reactor with synthetic blast furnace gas and Fe_(3)O_(4) /CaO = 0.6 kg/kg. CO production from the proposed process was investigated at both isothermal conditions(1023 K) and upon imposing a temperature program from 1023 to 1148 K. The experimental results were compared using performance indicators such as CO yield, CO space time yield, carbon recovery of the process, fuel utilisation, and solids’ *** temperature-programmed CO production resulted in a CO yield of 0.056 ± 0.002 mol per mol of synthetic blast furnace gas at an average CO space time yield of 7.6 mmol kgFe^(-1) s^(-1) over 10 cycles, carbon recovery of 48% ± 1%, fuel utilisation of 23% ± 2%, and an average calcium oxide and iron oxide utilisation of 22% ± 1% and 11% ± 1%. These experimental performance indicators for the temperature-programmed CO production were consistently better than those of the isothermal implementation mode by 20% to 35%. Over 10 consecutive process cycles, no significant losses in CO yield were observed in either implementation mode. Process simulation was carried out for 1 million metric tonnes per year of equivalent CO_(2) emissions from the blast furnace gas of a steel mill to analyse the exergy losses in both modes of operation. Comparison of the exergy efficiency of the temperature-programmed process to the isothermal process showed that the former is more efficient because of the higher CO concentration achievable,despite 20% higher exergy losses caused by heat transfer required to change temperature.