November 2004

Special Report: Plant Safety and Environment

Control refinery NOx with SCRs

Installing new technology provided this refiner with more flexibility with fuel gas and reduced total plant emissions

Damgaard, L., Preem Raffinaderi AB; Schroter, M., Haldor Topsoe; Widroth, B., Alstom Power

New national environmental rules required the Preem Raffinaderi AB in Götenburg, Sweden, to limit and reduce nitrogen oxide (NOx) emissions that are present in the exhaust of furnaces and reactors. Upgrading the isomerization capacity of this refinery required raising energy requirements. The installation of a new boiler increased steam generation capability and added another NOx source. This project also raised fuel gas consumption. Increasing natural gas consumption for the boiler was not an economical option. Likewise, the extra boiler also increased NOx emissions. This refiner elected to install a selective catalytic reduction (SCR) unit on the crude oil furnace to reduce plan

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