Optimization Of The Ventilation And Dust Removal System In A Pharmaceutical Workshop

The leakage and diffusion of drug dust in the production may cause harm to the health of workers and the high concentration of dust may induce the dust explosion,which affects the safety production of companies. The atmospheric environment is polluted by the emission of high concentration of drug dust as well. The rationality of the ventilation and dust removal system in workshop is an important technical premise. Aiming at the problems in the ventilation and dust removal system of a 6-APA workshop in a pharmaceutical company in Shijiazhuang, the optimization of the ventilation and dust removal system is researched. The purpose is to reduce the disorder diffusion of the drug dust caused by the irrational organization of the ventilation airflow and eliminate the adverse effects of the safety production and environmental pollution from the work environment. The main conclusions are as follows:1) The evaluation indexes of the organization of ventilation flow and the cleanliness levels for each process of the pharmaceutical workshop are analyzed. Combined with the futile effort of the ventilation systems, the airpak software is used to simulate the airflow, which directly represents the common organization of ventilation flow in the workshop.2) The mechanism of migration and propagation of the drug dust in workshop is analyzed. The fluent software is used to study the process of gas-solid two-phase flow. The migration of the dust in the workshop belongs to the category of gas-solid two-phase flow. The airflow is continuous gas phase. According to the turbulence model, the SIMPLIC algorithm is used to achieve calculation convergence. Dust belongs to particle phase. Because of the small volume concentration of drug dust, the DPM model is selected to simulate the trajectory of dust in workshop.3) Combined with the situation of ventilation and dust removal system in drying plant, the ventilation and dust removal system is optimized.Airpak software is used to simulate and contrast the different airflow organization in workshop. The more suitable airflow organization for long-term application is obtained. The program of airflow is improved by Increasing return outlets. The additional return outlets can effectively prevent the reentry phenomenon of dust. The majority of dust suspended in the air is discharged to outdoors.Fluent software is used to simulate the distribution law of dust concentration in the workshop. Research shows that the transport of dust in the air with small velocity does not change significantly. The gathering point of dust is near the producing dust point. The local exhaust hood is set 1 meter above the desiccators. The exhaust capacity of local exhaust hood is 6350.4m3/h(1.76m3/s). The dust concentration is decreased to 3mg/m3 through the improvement of the ventilation and dust removal system.The research is linked closely with the practical application. The CFD software is used to simulate the ventilation flow of the workshop. The airflow and distribution of the dust concentration are decrypted visually. The ventilation and dust removal system is optimized. The Research results provide the necessary theoretical and technical support for the design of dust removal system and control project in similar workshops.