注塑清洗过程防毒通风技术模拟研究

Simulation Study on Anti-virus Ventilation Technology in Injection Cleaning Process

为了获取注塑机清洗过程防毒通风设施关键参数,探索降低清洗过程毒物浓度的控制技术,运用计算机流体力学计算技术对该过程的毒物浓度分布和风流流场分布进行数值模拟,结果表明:环己酮浓度随着罩口距污染源距离的减小而减小,随着控制风速的增大而降低,当控制风速达到0.41 m/s时,环己酮浓度随着风速的增大而趋于稳定,因此该过程最适宜的控制风速为0.41 m/s;在控制距离一定的情况下,该过程的控制风速与风量成正比;在风量一定的情况下,控制风速随着控制距离的增大而减小,相关参数可由拟合出的公式进行计算得出。

In order to obtain the key parameters of anti-virus ventilating facilities for injection molding machines and explore control techniques to reduce the concentration of toxicants in the cleaning process,the computational fluid dynamics(CFD)techniques have been used to numerically simulate the toxic concentration distribution and flow field distribution of the process.The results show that the concentration of cyclohexanone decreases with the decrease of the distance from the hood to the pollution source,and decreases with the increase of the capture velocity;when the capture velocity reaches 0.41m/s,the concentration of cyclohexanone tends to stabilize as the wind speed increases,so the optimum capture velocity for this process is 0.41m/s;when the capture distance is constant,the capture velocity of the process is proportional to the exhaust air rate;when the exhaust air rate is constant,the capture velocity decreases with the increase of the capture distance and the relevant parameters can be calculated by the fitted formula.