Design And Numerical Simulation Of Exhaust Hood Used In Aluminum Electrolysis Anode Scrap Cleaning

Aluminum anodes is one of the main raw material for aluminum production, electrolytic production requirements it has good quality, to ensure proper, smooth and efficient operation. The quality of the anode scrap recycling and second using has a very direct relationship to anode scrap cleaning. Currently clean-up process generated a lot of dust, not only endanger the health of workers, but also cause serious pollution of the workshop environment. How to effectively control the dust of the anode scrap cleaning, this is a very important field of ventil-ation and dust removal, but have not been well resolved.At present, the rapid development of the computer science and technology, CFD (Comput-ational Fluid Dynamics) technology applied in the project is also used increasingly widely. This makes the CFD simulation technology applied to exhaust hood design and the numerical simulation of the flow field become possible.In this paper, take the aluminum manufacturer anode scrap local exhaust hood as the research object, using CFD software calculated principles and methods for the design of the exhaust hood flow field for a comprehensive analysis. Using GAMBIT to establish the role of lateral suction and jet exhaust hood of the mathematical model and FLUENT software to simulate the velocity distribution of the application of the exhaust hood. According to the characteristics of the anode scrap cleaning, on the top and edge of the anode scrap set the selection of control points.Obtained by calculating the wind speed required to reach the control point when the speed corresponding to the exhaust, and to determine the critical air speed of the role of the jet exhaust hood. Analysis the flow field characteristics and energy-saving effect of the different type exhaust hood and the different exhaust forms.The research indicated:compared with the current aluminum cleaning process in a very simple down-to use local exhaust hood, the design of the suction side exhaust hood and the jet exhaust hood both can use smaller row control of air flow to achieve the same effect. The use of side suction local exhaust hood can reduce the amount of19.05%of the exhaust air. Under the action of the jet with unilateral hood, when the jet width of lcm is better controled, calculating on two conditions for optimal air flow exhaust hood-type, getting the first working condition when the jet angle is30°the air volume of the exhaust hood air flow needed is reduced by64.04%, when the jet angle is50°the air volume of the second working condition exhaust hood air flow required minimum, the exhaust hood air flow needed is reduced by76.85%. Using with the adjustable angle baffle of the suction local exhaust hood, when the baffle angle is30°the exhaust hood air flow needed is reduced by44.38%. Using with the hood of bilateral jet effect, when the jet angle is20°the exhausthood air flow needed is reduced by22.4%. Through the economic calculation analysis of the optimal design of several forms of exhaust hood, the adjustable angle baffle of the suction local exhaust hood can save23.5%of the pipe and20.4%of the electricity; the bilateral jet effect exhaust hood can save11.8%of the pipe and12.3%of the electricity; the unilateral role of jet exhaust hood can save29.4%of the pipe and18.6%of the electricity. The results of the research provide a reference to the design of the exhaust hood of the anode scrap cleaning...