The Optimization Design Research Of The Ejector Type Ladle Baking Equipment

This project focuses on a new type of ladle baking equipment that is designed for the school-enterprise cooperation.And the new type of ladle baking equipment is combined with the technique of ejector combustion,blunt stable-combustion,high temperature air combustion and ladle baking.The combustion equipment has the advantages of good structural stability,simple and safe operation,high combustion efficiency.Firstly,the effect of structural parameters and operating parameters on the ejecting performance and combustion performance of ejector burner was analyzed by CFD numerical simulation.The study shows that when the operating parameters remain unchanged,the impact of the law are as follows:(1)With the blunt body angle ? increased,the ejection coefficient increased too.(2)The gap between the blunt body and the gas pipe increased when the blunt body angle ? keep constant,which lead to the increase of the area of the back body of the bluff body,and so did the flame return velocity,the propagation speed and the combustion temperature;(3)The ejection coefficient increases firstly and then tended stabilize with the increase of the diameter C of the combustion tube,which mainly due to the decrease of the gas flow resistance.(4)The gas pipe insertion depth A has no obvious effect on the gas flow rate or the flame speed.The corresponding ejection coefficient decreases with the increase of A,while the combustion temperature in the burner gradually reduces.When the structural parameters remain constant,the laws are listed as follows:(1)When the relative pressure of the gas is between 2 and 7 kPa,the increase of the gas pressure has little effect on the ejection coefficient,but the linear increase of the gas flow rate and the injected air flow rate which have the same increasing amplitude.When the pressure increases to 15 kPa and 20 kPa,the ejection coefficient decreases obviously.(2)The directivity of the burner is positively correlated with the initial temperature of the gas and the injected air,which is mainly due to the decrease of the required gas flow.The increase of the degree of molecular activity results in the constant increase of injected gas flow,in addition,the increase of initial temperature will lead to the corresponding increase of gas combustion temperature in the burner.(3)Under the same working conditions,the ejection coefficients of three typical combustible components satisfy the result: H2> CO> CH4,which is mainly due to the greater the thermal conductivity of the gas is,the faster the combustion reacts and the flamepropagates.As a result,the addition of gas with large thermal conductivity can increase the ejection properties of the burner.Secondly,by the means of heat balance calculation method,it is concluded that the gas consumption of the ejector ladle is 718Nm3/h.Based on the numerical simulation results,the ejector burner is designed and a set of ejector ladle baking system is built.Finally,this paper introduces the experimental study of the ejector ladle baking equipment,and analyzes the using effects of the original 120 t ladle baking equipment and the new 120 t ejector ladle baking equipment.It was tested that when the four temperature points reach 1000°C,the ejector ladle baking equipment costs about four hours less than the regenerative ladle baking equipment does.When baking different ladles,the amount of gas consumed by the ejector ladle baking equipment was reduced by about 30% per hour.