Study on pollution characteristics of emitted high-temperature particles associated with thermal process in the casting workshops
To clarify the pollution characteristics of high-temperature particles associated with the thermal process in the foundry workshop with local ventilation systems,the microscopic characteris-tics,concentration distribution and personal exposure of particles in different process post areas of a state-owned enterprise casting workshop were investigated by experimental tests combined with expo-sure calculation in present study.The results show that the dust particles have different shapes,de-veloped surface voids,large specific surface area,and contain a large amount of oxides of Fe,Al,Si,while carrying Mn,Ti,Cr and other carcinogenic heavy metal elements.In addition,it takes nearly 24 h for 10 μm particles to settle from a height of 10 m to the ground,and the concentrations of 2.5-micrometer particular matter(PM2.5)and inhalable particles(PM10)in different posts are 5-10 times that of the indoor concentration of various civil buildings.Under protective conditions,the daily intake of PM2.5 and PM10 of workers is between 5 and 10 times that of ordinary civil buildings.There-fore,the post environment in the casting workshops is still relatively harsh,and there is an urgent need to develop more effective protective tools and optimize the design of ventilation systems.
万方数据
维普
