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Off‐Gas Waste Heat Recovery for Electric Arc Furnace Steelmaking Using Calcium Hydroxide (Ca(OH) 2 ) Dehydration
Author(s) -
Hartfuß Georg,
Schmid Max,
Scheffknecht Günter
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.202000048
Subject(s) - steelmaking , waste heat , waste heat recovery unit , waste management , heat exchanger , electric arc furnace , heat recovery ventilation , calcium hydroxide , metallurgy , materials science , engineering , chemical engineering , mechanical engineering
Off‐gas waste heat recovery for electric arc furnace (EAF) steelmaking is challenging because high off‐gas velocity, fluctuating temperature, and high dust contents must be considered. In addition to the harsh off‐gas conditions, a heat storage system must be included to balance power‐off times of the EAF during taping or charging. However, waste heat recovery offers a significant potential for further efficiency improvements in EAF steelmaking. Herein, a novel process concept for extraction, storage, and utilization of off‐gas waste heat via entrained flow dehydration of calcium hydroxide (Ca(OH) 2 ) for efficient power generation is described. The use of waste heat exchangers is avoided, and small heat storage units are achieved. The process concept, Ca(OH) 2 dehydration and heat storage mechanism as well as important process parameters are discussed. Finally, the energy balance of the waste heat recovery process and further process improvements are presented.