Sumitomo Metal Industries Ltd. (SMI) announced it had achieved an outstanding energy-saving performance using the Kalina cycle heat recovery power generation system for the steelmaking process. The system has been operating at Kashima Steel Works since November 1999. The system has a generating capacity of 3,450 kW, with a thermal efficiency of 11 percent and is able to save 6,000 metric tons of crude oil per year.The Kalina cycle heat recovery power generation system uses ammonia water as the working fluid to recover thermal energy from waste heat with relatively low temperature. SMI was the first to introduce the Kalina cycle system to the steel-making process to recover thermal energy of warmed drainage (98 deg C),which was obtained from the cooling system of the oven gas recovery system of basic oxygen furnaces (BOF) at Kashima's No. 2 steelmaking shop. The shop operates two BOFs, each with a capacity of 275 metric tons/heat.
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