Utilization of CO-rich waste gases from the steel industry for production of renewable liquid fuels

Tomy Hos, Moti Herskowitz

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Waste gases generated during steelmaking are an enormous source of CO2 emissions. Rather than supply heat and power to the plant by combustion, those gases can be utilized efficiently at a low cost to produce renewable liquid fuels. It upgrades the economic value of the gases and reduce CO2 emissions. CO-rich waste gases emitted from the blast furnace or basic oxygen furnace are of particular interest since they contain a valuable reactive compound that is simply combusted rather than converting it to green products. A novel Fe-based catalyst was used in this study to evaluate the performance of the projected syngas compositions as feed (H2/CO molar ratio of 0.7 and CO2 content above 30%v/v) for the CO hydrogenation process. The C5+ selectivity of the combined CO conversion and oligomerization processes was 81%, while the CO conversion was dependent on the WHSVCO and syngas partial pressure. Three cases were techno-economically evaluated based on the integrated steel plant with a production capacity of 12MM tonnes/year. The economics of the process depends mainly on the cost, composition and availability of the gases. Generally, the levelized cost of product is in the range of 0.38–0.78$/liter, which is significantly lower than the recent market price of renewable fuels. Sensitivity analysis suggests that the price can be further decreased. The energy efficiency is in the range of 41.7%-54.6% for all cases. Environmental benefits can be improved by integrating carbon-free H2 in the process, but its price should be reduced considerably to be economically feasible.

Original languageEnglish
Article number114233
JournalEnergy Conversion and Management
Volume240
DOIs
StatePublished - 15 Jul 2021

Keywords

  • CO hydrogenation
  • Carbon utilization
  • Renewable fuels
  • Steel work off-gases
  • Techno-economic analysis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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