Steam Generation: Components 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. Note that due to how the variables are used in the modeling equations, the range of acceptable values may be further reduced; for more details, see Steam Generation: Modeling Assumptions & Constraints.

Variable	Default Value	Range

○ Oxygen Indicates the pure component that is associated with the oxygen species. Click on the list box to bring up a list of available components in order to select one.	<Oxygen>	Any Pure Component
○ Water Indicates the pure component that is associated with the water species. Click on the list box to bring up a list of available components in order to select one.	<Water>	Any Pure Component
○ Nitrogen Indicates the pure component that is associated with the nitrogen species. Click on the list box to bring up a list of available components in order to select one.	<Nitrogen>	Any Pure Component
○ Carbon Dioxide Indicates the pure component that is associated with the carbon dioxide species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Sulfur Dioxide Indicates the pure component that is associated with the sulfur dioxide species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Ash Indicates the pure component that is associated with the ash species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component

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 Steam Generation: Modeling Calculations:

Specify a suitable pure component for each element that may be present in the flue gas stream or in the ash stream. These include unburned oxygen, water vapor, inert nitrogen, fuel ash, and combustion gases carbon dioxide and sulfur dioxide. Before using this tab, you may need to register suitable pure components for carbon dioxide, sulfur dioxide, and ash; for more details on how to register a pure component, see Pure Component Registration.

•Oxygen, Water, and Nitrogen...

Suitable pure components are pre-selected for these elements from the list of registered pure components.

•Carbon Dioxide and Sulfur Dioxide...

You must specify a suitable pure component for these elements.

•Ash...

You only need to specify a pure component for ash if you specified an elemental ash composition for a fuel component (see Steam Generation: Elemental Composition Tab).

•Register Pure Components

It is possible to introduce new pure components in the process by simply clicking on this button:

This will present you with the Pure Component Registration Dialog that allows you to register new pure components without exiting the stoichiometry balance and the operating conditions dialogs.