Abstract
Electric furnace short process steelmaking is one of the most important steelmaking methods in the world today, and the waste heat recovery potential of electric furnace flue gas is huge. The research on the recovery of electric furnace flue gas waste heat is of great significance. In order to make better use of this part of the heat, in this paper, a compound cycle of nitrogen Brayton cycle as a first-order cycle and toluene transcritical Rankine cycle as a second-order cycle is proposed to recover waste heat from furnace flue gas in steelmaking process for power generation. A mathematical model was established with the net output power as the objective function and the initial expansion pressure, the final expansion pressure, the initial expansion temperature and the initial pressure of the second cycle as the independent variables. The effect of multivariate on the net output power of the waste heat power generation cycle is studied, and then, the optimal parameters of the compound cycle are determined. The results show that under the general electric furnace steelmaking process, the power generation efficiency of this new cycle can be increased by 21.02% compared with the conventional cycle.
Highlights
Electric furnace steelmaking is one of the most important steelmaking processes today
Through multiple verification tests, it proves that the technology shortens the working time and improves the power factor in practical applications; coherent jets are widely used in electric arc furnace (EAF) steelmaking processes to enhance chemical energy input, speed up the smelting rhythm, and promote uniformity of bath temperature and composition
Aiming at the heat recovery of electric furnace flue gas, building on research by seniors, this paper proposes a compound cycle composed of nitrogen Brayton cycle and transcritical toluene Rankine cycle
Summary
Electric furnace steelmaking is one of the most important steelmaking processes today. The test proves that EFA dust slag and lime can effectively remove Co, Cr, iron, nickel and zinc in wastewater, and the removal rate reaches more than 99.6% This technical route recycles the dust and slag of the electric arc furnace, and has simple operation and only requires mechanical mixing. It replaces the chemicals used in wastewater treatment, has good economy, and is environmentally friendly; In Reference [5], the effects of EAF steel slag on the fracture and temperature sensitivity of warm-mixed asphalt (WMA) were tested.
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