Study On The Regulation Law Of Tempurature Field In Multi-microwave Source Reactor

Heat transfer is one of the most common unit operations in industrial production,and heat transfer equipment accounts for a large proportion of investment in chemical plants.In the chemical production process,part of the chemical reaction process is carried out higher than the normal temperature condition,which involves heating the reaction system to a certain temperature during the heat transfer process to meet the requirements of the reaction system.However,Traditional reactor heating from the outside to the inside has problems such as low efficiency,temperature gradient of the system,and high energy loss.Microwave heating is heated in the collision of polar molecules,and has the characteristics of fast heating rate,high efficiency,deep penetration,small heat loss,strong controllability,and uniform heating.It has been used in food,chemical materials,medical care and the field of environment.However,current research on microwave heating has focused on temperature field studies of single microwave source reactors.Therefore,this paper proposes to study the temperature distribution law of temperature field in multi-microwave source reactor.The main research contents are:(1)By using a multi-microwave source reactor for heating solution,the temperature field distribution of the surface of the solution under different operating conditions such as the number of microwave sources,the position of the microwave source,the heating time,the heating power,and the volume of the reactor was investigated.The results show that the surface temperature field distribution of the solution is different when the number of microwave sources is different.When a single microwave source is turmed on for heating,the closer to the microwave source,the temperature is relatively higher,and the farther from the microwave source,the temperature is relatively lower.When the position of the microwave source is different,the surface temperature distribution of the reactor is different.When the microwave source is arranged at multiple points,the surface temperature of the reactor is evenly distributed.When the heating time is longer,the higher the temperature,the more uniform the surface temperature distribution of the reactor;the smaller the reactor volume,the faster the heating rate,the more uniform the surface temperature distribution of the solution in a shorter period of time;When the microwave power is larger,the microwave utilization rate is higher,and the surface temperature distribution is more uniform.(2)By using a multi-microwave source reactor for heating,a single point contact measurement is performed by a thermocouple,and the temperature distribution law of the reactor body phase under different operating conditions is obtained.The results show that the longer the heating time,the more uniform the temperature distribution of the bulk phase,but there is still a certain temperature gradient.The temperature distribution of the temperature in the radial distribution of the reactor is "inner low and high outside".In the longitudinal direction,the temperature is firstly increased and then decreased.The highest temperature occurs at a distance of 0.5 cm from the upper surface,and the highest temperature point appears at 8 cm from the bottom of the reactor and 0.5 cm from the upper surface.The higher the microwave power,the higher the microwave utilization rate,and the more uniform the temperature field distribution of the reactor body phase.(3)A heat transfer model is established for the microwave reactor heating process based on the heat transfer equation and the law of conservation of energy.The MATLAB software was used to simulate the temperature field at different positions,different heating times and different heating powers.The simulation results are compared with the measured results to verify the correctness and rationality of the heat transfer model.