Scrap Preheating using Waste Heat in Metal Casting

Abstract

In the present time in the world energy crisis is increasing exponentially, it becomes necessary to conserve energy required in metal casting. While casting, the molten metal is poured into the mould cavity and then left undisturbed for cooling and solidification. Large amount of energy is dissipated during this process as a waste heat into the atmosphere. Even the knocked out casting left for cooling down in the shop floor has heat energy stored in it. If this waste heat can be utilized for pre-heating of scraps (raw material) by any suitable arrangement then lot of energy wastage during solidification can be utilized resulting in economical and environment friendly process. The paper discusses about an innovative approach to implement such a methodology. In the present scenario, the entire world (196 countries) work together to limit global warming to not more than 2 °C temperature above pre-industrial levels, with the stretch goal of keeping below 1.5°C temperature of earth (Parish agreement (cop-21)-2015-16)[1]. India accounts for around 4.5 percent of the global greenhouse gas emissions. We will ratify Paris agreement on October2, Mahatma Gandhi’s life perhaps left the least carbon footprint on earth. In experiment, due to preheating of scrap 2.66% less energy is required in comparison to without preheating. In this technique we have been used aluminum powder in between the scrap and hot casting, resulting in an increase of heat energy by 4.28 %. This much energy savings in casting industries may considerably help in reduction of global temperature. In this paper we are trying to reduce temperature of the whole world and a contribution to Paris agreement-2015. This when practiced throughout the country it can conserve huge amount of energy which is mentioned in this paper in detail.