This unit operation is used to model batchwise mixing of bulk solids in a tumble mixer.
● Mixing In a Batch Tumble Mixer Procedure
In Design Mode of calculation, the user specifies the working to vessel volume ratio (through the Volumes tab) and the program sets the working (liquid) volume (Vw) equal to the volume of material that is processed per cycle. The specified or retrieved bulk density of the stored material is used to calculate the bulk volume of the stored material from its mass. The number of cycles per batch is specified through the Scheduling tab. The vessel volume (V) is calculated using the following equation:
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If the calculated vessel volume exceeds its maximum possible value (specified through the Equipment tab), the program assumes multiple (identical) units operating in parallel with a total vessel volume equal to the calculated.
In Rating Mode, the user specifies the vessel volume and the number of units. The program calculates the working to vessel volume ratio and warns the user if its value is outside of its minimum and maximum limits.
The interface of this operation has the following tabs:
● Oper. Cond’s, see Batch Storage: Oper. Conds Tab
● Volumes, see Batch Storage (for Bulk Solids): Volumes Tab
● Vent/Emissions, see Reaction Operations: Vent/Emissions Tab
● Labor, etc, see Operations Dialog: Labor etc. Tab
● Description, see Operations Dialog: Description Tab
● Batch Sheet, see Operations Dialog: Batch Sheet Tab
● Scheduling, see Operations Dialog: Scheduling Tab