Study On The Scheme And The Numerical Simulation Of The Heat And Energy Recovering System For Electrically Calcined Furnace Of The Carbon Factory

Electrically calcined furnace is one equipment of the the carbon factory with energy consumption highly.Because the low calorific value gas is inflammable,explosive and difficult to secure recycle,the exhaust gas of electrically calcined furnace is directly exhausted to burn by many enterprises, resulting in waste and pollution.Developing and researching on the technology of heat and energy recovery in electrically calcined furnace,to improve the utilization of resource and promote energy conservation,it has important scientific significance and practical value.Electrically calcined furnace in the carbon factory of a branch company in domestic aluminum industry is chosen as the study object.The security of the exhaust gas from electrically calcined furnace is analyzed.The explosion limit of the exhaust gas from electrically calcined furnace is calculated.The possible amount of heat and energy recovered is analyzed. With the actual,the efficient and safe method of the heat and energy recovery in electrically calcined furnace is studied.The heat and energy recovery device and the heat and energy recovery system are designed.The input and the output for various schemes are calculated.The benefit and security of the heat and energy recovering program are analyzed.To improve the efficiency and safety of the heat and energy recovery device, based on data of thermal balance test,FLUENT is used to study numerical simulation of six operation conditions of the heat and energy recovery device for electrically calcined furnace.The effects of the height of the air inlet and the negative pressure of exhaust orifice on the temperature field,the concentration field,the velocity and the static pressure distribution of the heat and energy recovery device are analyzed.The results show that:if the height of the air inlet increases,the thermal efficiency will improve,and the heat and energy recovery device will be more safe.Based on the same air inlet condition, when the negative pressure increases, air injected will increase, air and gas will be mixed better,flame will become shorter,efficiency of the heat and energy recovery will increase.In the six conditions,when the air inlet height is 150mm and the pressure of exhaust orifice is-16Pa,it is the most beneficial to improve the recovery efficiency and safety.If the heat and energy recovery system for electrically calcined furnace will be used, the benefit 3.7×106 Yuan RMB can be gained annually, the discharge amount of CO2 can be reduced 2838t annually.