iRecovery® System
Process optimization and energy efficiency to reduce emissions are ever more important for all steel producers. In the past 10 years, TENOVA in the frame of environmental sustainability developed the iRecovery® system for recovering of the thermal power available in the EAF waste gas and valorize it.
Overview
iRecovery® technology results in effective recovery of EAF off-gas thermal energy. This energy is the biggest fraction of the primary energy input in the EAF process typically wasted away. The iRecovery® system consists in a Heat Recovery for Steam Generation (HRSG) with a radiant, Evaporative Cooled System (ECS), and convective section, the Waste Heat Boiler (WHB), which can completely process the waste gas from approx. 1700°C to 200°C. Pressurized water at boiling point feeds the ECS + WHB where it is converted into steam through the heat exchanged with the waste gas. Saturated steam the energy carrier to the different users.
iRecovery® was firstly developed for standard 100% scrap EAF basket charging processwhere the energy in the waste is almost 25% of the primary input in a standard process using about 380 kWh of electrical energy per ton of liquid steel. The iRecovery® performance is based on 180-200 Kg/tls of steam.
The well-known Tenova EAF Consteel process for continuous charging and charge pre-heating, [2], is one of the main technologies for recovering and re-using the waste gas thermal power directly in the melting process. Tenova coupled the Consteel and iRecovery® in order to improve the effectiveness of its technologies: while the high temperature thermal power contained in the waste gases, up to 800°C, is first used in scrap preheating by Consteel, the WHB is recovering the residual waste gas energy. This combination can produce about 90-140 kg/tls of steam.”
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