微波裂解设备的设计仿真与工艺试验

Design Simulation and Process Test of Microwave Cracking Equipment

设计了一款用于裂解炭化废弃农作物二次利用的农业装备,主要包含对微波裂解功率的计算、电路和关键装置的设计、磁控管的选型。设备的微波总功率最大为3.6kW、频率选用工业常用的频率2.45GHz,裂解腔的半径为150mm,高为700mm。采用HFSS对裂解腔内部的电场进行仿真,发现裂解腔内部的电场分布较为均匀,基本满足设计和试验要求,且使用电镜可以很直观地看到棉秆在每一个温度阶段表面的结构变化。以含水率、微波功率、裂解温度为试验因素,进行三因素三水平工艺性试验,可确定主次因素为含水率、微波功率、裂解温度,最优试验方案为含水率11%、功率2.1kW、裂解温度300℃。经过试验验证可知,设备满足设计要求。

In this paper,an agricultural equipment for the secondary utilization of cracked and carbonized waste crops is designed,which mainly includes the design of power,circuit and key devices,and the selection of magnetron.The maximum microwave power of the equipment is 3.6 kW,and the frequency is 2.45 GHz,which is commonly used in industry.The radius of cracking chamber is 150 mm,and the height is 700 mm.HFSS is used to simulate the electric field in cracking chamber.Through simulation,the electric field distribution in cracking chamber is relatively uniform,which basically meets the design and test requirements.With the help of the electron microscope,the structural changes of the cotton stalk surface at each temperature stage can be seen directly.Through the design of three factors and three levels of technological test,taking moisture content,holding time and cracking temperature as experimental factors,it can be determined that the primary and secondary test factors are moisture content,microwave power and cracking temperature.The optimal test scheme is moisture content of 11%,power of 2.1 kW and cracking temperature of 300℃.Through the test,it can be seen that the equipment meets the design requirements.