System Identification: Induction Heat Treating Machines Solids/Liquid: Slag residue and metal fines in quench water Problem: In the systems manufactured and sold by Industrial Electric Heating Company of Columbus, Ohio, metal parts and components are hardened by heating to temperatures of 1600- 1800°F. Quench water is used for post-treatment cool-down, creating slag particles which can foul the system’s heat exchangers and accumulate in their que

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