Rotary Kiln: Equipment Tab

Variable Definitions, Ranges and Default Values

The following table shows the meaning of the variables appearing in this tab, as well as their default values and their generally acceptable range. Note that due to the manner by which the variables are used by the sizing and costing equations, the range of acceptable values may be further reduced.

Variable	Default Value	Range

○ Max. Diameter The maximum diameter of a rotary kiln that is available for purchase in the market.	6.0 m	Positive
◙ Diameter The diameter of the rotary kiln.	0.0 m	Positive
◙ Length The length of the rotary kiln.	0.0 m	Positive
◙ Length/Diameter The length to diameter ratio of the rotary kiln.	20.0	Positive
◙ Rated Capacity The production capacity of the rotary kiln.	208.332 MT/h	Positive
● Lateral Surface Area The peripheral surface area of the rotary kiln which is equal to πDiameterLength.	0.0 m²	Positive
● Volume The volume of the rotary kiln.	0.0 m³	Positive

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Sizing: Design Mode

In Design Mode, the user specifies the Max Diameter and Length/Diameter Ratio. Based on these, the program calculates the maxum volume of a single rotary kiln that is available for purchase on the market. In addition, the user specifies the operation’s Specific Volumetric Loading and based on this, the program calculates the total kiln volume required for this operation. If the total kiln volume does not exceed the maximum kiln volume, a single unit of diameter equal to the total kiln volume is used. If the total kiln volume exceeds the maximum kiln volume, then multiple identical units are used whose diameter is such that the sum of all kiln volumes is equal to the total volume requirement for this operation. In addition to calculating the number of units and diameter, the program also calculates the kiln’s length, rated capacity, lateral surface area and volume.

Sizing: Rating Mode

In Rating Mode, the user specifies the number of units as well as the kiln diameter and length. Based on these, the program calculates the length/diameter ratio, lateral surface area and volume. In addition, the user specifies the rated capacity and if it is less than the operating throughput per unit, the program displays a warning.

Costing

The built-in purchase cost is based on the built-in purchase cost of a Rotary Dryer which is multiplied by a factor of 1.2 to account for additional costs such as the cost of a burner.

The user-defined purchase cost is based on the rotary kiln’s lateral surface area.

For more information on this equipment, see Rotary Kiln.

For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.