Study On Suspended Particulate Distribution Characteristic In The Resin Sand Shakeout Operation

Suspended particle is the key problem causing haze.The foundry industry become known as one high emission industry of pollutant.The composition of particle size and the diffusion process of suspended particles are complex in the foundry.It is urgent to study the distribution characteristics and control strategies of suspended particles in the casting process.The research object of this paper is the resin sand shakeout operation of a company in Ningxia.Through field tests,analyzed the diffusion phenomenon and influence factors of foundry dust,used the computational fluid dynamics software(CFD)and self-created UDF program to research the influence of multiple particle size group of the particle size distribution and unidirectional periodic transverse interference airflow on the distribution characteristics of suspended particles.Different control strategies of suspended particles affected by periodic transverse interference airflow were analyzed and compared.Finally,the influence of the downdraft hood at different positions on the arresting efficiency of the suspended particles was simulated and analyzed.The results show that the optimal scheme is downdraft airflow when taking factors of the trapping effect of suspended particulate matter and equipment installation into account.The arresting efficiency is 93%.Due to the influence of the unidirectional periodic transverse interference flow,the position of the dust control airflow should not be just below the nozzle.It should be determined by the blocking effect of the periodic transverse interference flow.The results of this study can provide technical references for the control of suspended particles in resin sand shakeout operation.