Flow field characteristics of flue gas and exhaust system optimization in electric furnace

Applies the CFD numerical simulation method to study the flow field characteristics and the gas collection of the high temperature flue gas produced in a steel plant using the original exhaust system, and proposes an optimal scheme of adding a top suction hood on the original suction hood system. Ensuring the consistent total air flow rate of the exhaust system, simulates and analyses the flow fields at five different top suction air flow rates in the factory building, and compares the flue gas collection efficiency at different air flow rates. The results show that with the effect of the original exhaust system, high temperature flue gas entrains ambient air in the factory building and forms a temperature and concentration stratification, the flue gas collection efficiency of the side suction hood is 61.7%; When adding the top suction hood, the longitudinal smoke temperature in the workshop increases with the increase of height, and the diffusion of flue gas in the horizontal direction decreases. The air flow rates are 400 000 m3/h and 210 000 m3/h for the top suction hood and the side suction hood, respectively, with the almost 80% of collection efficiency. By analysing the flow field characteristics of high temperature flue gas and the collection efficiency of the flue gas exhaust system, suggests an optimal design for the exhaust system of the electric furnace steelmaking.