Abstract
In this study, the double screw lifting device of a rubber factory is taken as the case study object, and a scale model experiment was designed to determine the temperature field, velocity field and concentration field of pollutant escape of double spiral lifting transportation device are compared, and the capture efficiency is compared under the conditions of different dimensionless installation height and local exhaust hood air flow velocity Vexh. Reduced-scale experiments were conducted with a geometric scale of 1:4. Compared with no local exhaust hood, the concentration at the same measuring point decreases significantly under the action of local exhaust hood (dimensionless distances z/d = 3/4 and z/d = 2/4). Under the condition of maintaining the same local exhaust hood air flow velocity Vexh, the capture efficiency of local exhaust hood increased by 4% and 1% respectively on the dimensionless installation distance Z/D was 3/4 and 2/4 respectively. The experimental method of this case study and the air flow field experimental data obtained can provide a reference for the subsequent design and installation of exhaust hood.
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