Exhaust From Conveyor Transfer
Get a copy of "Industrial Ventilation" published by American Conference of Governmental Industrial Hygienists. Allow for 50% more for 'dry, dusty materials'.
Michael Reid. ■
Re: Calculation Of The Exhaust For Transfer Point
The MHEA design guide says -
less than 1 m/s - 0.5m3/s/m width of belt
over 1 m/s - 0.7 m3/s/m width of belt
Transfer point enclosure design to provide 0.75 - 1 m/s indraft at all openings ■
Exhaust Velocity At Belt Transfer Point
The exhaust velocity, exiting a transfer is, in part, dependent on the following conditions:
1. Design of chute which controls flow stream velocity at point of impact with receiving belt
2. Size distribution and bulk density of granular material stream
3. Belt speeds of discharge and receiving conveyors
4. Design and length of skirtboard system once material is on receiving belt
5. Baffles and decanting chamber designs in chute and receiving skirts
6. Work point change in elevation between discharge and receiving conveyors
7. Profile angles to horizontal plane between discharge and receiving conveyors
8. Moisture content of flow stream
The material stream velocity exiting the receiving belt skirtboard can then be predicted based on Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) coupled models, given they can handle reasonable material size distribution. The material size distribution sets the surface roughness that defines the gas turbulence together with receiving belt velocity and ore stream velocity at the skirtboard exit point. All 8 points contribute.
The method is very complex to define in mathematical terms.
I may have forgotten to list some additional values/conditions that can be offered by other knowledgable forum members. ■
Calculation of the Exhaust for Transfer Point
Dust control is required at the transfer points for the belt conveyor, who can tell how to calculate the exhaust for transfer point.
Thanks in advance! ■