Even though vast improvements in energy efficiency have been made to the steel industry in the past 10 years, some stages of the process have output offgas streams that contain more than 50 % of the total energy input. As energy costs continue to rise and resources become scarcer, energy recovery is becoming an important cornerstone for the sustainability of the steel industry. Energy recovery can provide cost savings, resource savings, and reduction of carbon footprint/greenhouse gas emissions. The nature of many steelmaking processes makes it challenging to recover the energy from the offgas stream due to high dust loading and thermal cycling in batch processes. This paper describes the evaluations conducted by WorleyParsons for several steelmaking facilities and explores the challenges and the novel heat recovery solutions that are under development to allow the energy in the offgas to be recovered.
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