Continuous Stoichiometric Reaction in a Rotary Kiln: Oper. Conds Tab

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range:

Variable	Default Value	Range

● Air Stream Indicates the input port that is connected to the stream that is used as oxygen source. If an inlet stream is already present at the selected port, then the button next to the selection is active. Click on that button to bring up the attached stream’s simulation dialog in order to provide its composition.	<None>	Dedicated Input Port
● Relative Humidity (%) The % relative humidity of the air stream.	0.0	0-100
◙ Excess Oxygen (%) The % excess oxygen of the air stream.	5.0	0-100
◙ Air-Fuel Ratio The ratio of the mass flowrate of the air stream to the mass flowrate of the fuel stream.	0.0	Positive
● Stoichiometric Air-Fuel Ratio The minimum air-fuel ratio required for stoichiometric combustion.	0.0	Positive
● Is Solid? This box is set automatically by the program depending on whether the ‘Is Solid?’ property of the corresponding pure component is checked or not on the Pure Component Properties dialog.	No	Yes/No
○ % Entrainment The percent entrainment in the exhaust gas stream of a solid pure component’s feed stream mass. Note that this percentage can only be set for solid pure components (i.e., pure components whose ‘Is Solid?” box is checked).	0.0	0-100
● Operating Throughput (per Cycle, per Unit) (kg/h) The mass flowrate of the product stream divided by the number of cycles (if the procedure is in batch mode) and by the number of units.	0.0	Positive
● Specific Volumetric Loading (kg/h-m3) The ratio of the mass flowrate of the product stream to the equipment volume.	0.0	Positive
● Heat Input(kW) The total thermal energy input of the fuel based on LHV.	0.0	Positive
○ Overall Heat Losses (%) The total heat that is lost to the surroundings expressed as a percentage of the heat input.	5.0	0-100
○ Product Temperature (^oC) The temperature of the product.	1400.0	0-100
● Exhaust Gas Temperature (^oC) The temperature of the exhaust gas.	0.0	0-100

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

Specification Choices / Comments

The following list describes the available specification choices in this tab; for more details on how these are implemented, see Continuous Stoichiometric Reaction in a Rotary Kiln: Modeling Calculations.

•Air flow specification options...

You may choose to either specify the percent excess oxygen of the air stream or the air-fuel ratio.

•Duration options...

Duration options are only available in batch mode. You can set the process time, or have the process time calculated based on operating throughput, or match the duration of this operation to the duration of another operation by introducing a master-slave relationship between the two operations. If you introduce a master-slave relationship, the program will match the setup time, the process time and the turnaround time of this operation (the ‘slave’) with the corresponding times of the reference operation (the ‘master’ operation). For more details on how to setup a master-slave relationship, see The Scheduling Tab.