Abstract
This paper presents a thermochemical regenerative heat recovery process for utilizing the waste heat of oxy-fuel furnaces, with three significant modifications compared to current state-of-the-art reforming concepts. (I) Experimental tests with a reformer test rig were performed, in order to investigate the bi-reforming of methane into syngas by using water and carbon dioxide with a steam-to-carbon ratio of 0.5. The measured syngas concentrations were compared to calculated equilibrium values and carbon deposits were determined. A methane conversion rate of 95.3% was achieved. (II) Carbon deposits in a regenerator bed are usually burned with purge gases. In contrast to this procedure, oxygen was added to the fuel/exhaust gas mixture in order to cause tri-reforming of methane with a steam-to-carbon ratio of 0.4. The syngas concentrations were compared to equilibrium values and it was found, that tri-reforming significantly reduces carbon formation. A methane conversion rate of 96.7% was achieved. (III) Furthermore, reforming and regeneration cycles were coupled and it was found that the temperature profile within the TCR regenerator bed material varies greatly from that of a common regenerator. Regeneration with water and carbon dioxide was sufficient to eliminate all carbon deposits.
Original language | English |
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Pages (from-to) | 381-391 |
Number of pages | 11 |
Journal | Energy |
Volume | 155 |
DOIs | |
Publication status | Published - 15 Jul 2018 |
Keywords
- Bi- and tri-reforming of methane
- Carbon formation
- Oxy-fuel furnace
- Syngas
- Thermochemical regeneration
- Waste heat recovery
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- Pollution
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering