Application of membrane gas separation processes to CO2 and H2 recovery from steelmaking gases for carbon capture and use

Abstract : Steel is produced today mainly in a blast furnace-oxygen converter process, leading to three main types of emissions: blast furnace gas (BFG), coke oven gas (COG), and converter gas (BOFG). In the framework of the VALORCO project, an analysis of the possibilities for reducing carbon emissions, combined with the valorization of emissions from the steel industry, was carried out. One of the routes studied is the production of compounds of industrial interest such as methanol, which can be produced by chemical transformation of the CO and / or CO2 contained in the emissions associated with hydrogen. The main objective of this thesis work is to evaluate the possibilities offered by the gas permeation process applied to the selective recovery of these compounds in the three types of emissions. Initially, a state of the art of the various projects dedicated to the capture (CCS) and the valorization (CCU) of the emissions in the steel industry is presented, with particular attention to the different gas separation technologies. Experimental measurements of selectivity and permeance for different temperature and pressure conditions, carried out on a dedicated bench with two commercially available membrane materials, one selective to hydrogen (glassy) and one to CO2 (rubbery), allowed a systematic parametric study by simulation of the separation performance of the process applied to the BFG, COG and BOFG. A comparison of the processes based on one or more permeation stages, including recirculation loops, was then undertaken in a Process System Engineering (PSE) environment (Aspen Plus software). The influence of the operating parameters (pressure ratio, temperature, stage cut) on the separation performance was evaluated, leading to a mapping of attainable compositions. The energy consumption and the membrane surface required for each configuration allow a techno-economic optimization of the process, on the basis of an economic model integrated to the simulation conditions
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Submitted on : Monday, November 26, 2018 - 3:09:08 PM
Last modification on : Tuesday, November 27, 2018 - 1:22:21 AM

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  • HAL Id : tel-01935185, version 1

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Alvaro Andres Ramirez Santos. Application of membrane gas separation processes to CO2 and H2 recovery from steelmaking gases for carbon capture and use. Chemical and Process Engineering. Université de Lorraine, 2017. English. ⟨NNT : 2017LORR0272⟩. ⟨tel-01935185⟩

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