Change the Heat of Combustion Method for Coal
Note that you assigned Carbon a Type of Solid. Specifying a component type of Solid allows that component to be placed in the CIPSD substream.
3Click 
to continue.
The Properties | Advanced | NC Props | Property Methods sheet appears.
Defining Properties
Use the Properties | Advanced | NC Props | Property Methods sheet to specify the models used to calculate the nonconventional solid properties. In Simulation 1, Aspen Plus estimates the heat of coal combustion based on its PROXANAL, ULTANAL, and SULFANAL. In this simulation, enter the heat of combustion directly.
1In the Component field, click 
and select COAL.
2In the toolbar, click 
.
3Click the HCOALGEN Model name.
4Click the Coal Enthalpy link.
5In the help window that appears, scroll down to the table
HCOALGEN Option Codes.
The help screen indicates that the first option code defines how Aspen Plus calculates the heat of combustion. Aspen Plus has six methods for calculating the heat of combustion. Use the sixth method, User input value.
6Close the help window.
Getting Started - Solids |
Modeling Coal Combustion • 3-7 |
7Change the first HCOALGEN Option code value field from 1 to 6.
Specify Methods for You must also specify how Aspen Plus calculates the enthalpy and
Calculating Ash |
density of ASH. |
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Properties |
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In the Component field, click |
and select ASH. |
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9 |
In the Model name field for Enthalpy, click |
and select |
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HCOALGEN. |
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The Option code value defaults of 1, 1, 1, and 1 are acceptable |
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for ASH. |
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10 |
In the Model name field for Density, click |
and select |
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DCOALIGT. |
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3-8 • Modeling Coal Combustion |
Getting Started - Solids |
Specify the Heat of Combustion for Coal
You just specified that Aspen Plus will use a user-specified value for the heat of combustion of coal. Now you must specify that value.
11From the Data Browser, select the Properties | Parameters |
Pure Component folder.
The Properties | Parameters | Pure Component object manager appears.
12Click New.
The New Pure Component Parameters dialog box appears. The heat of combustion for coal is a Nonconventional type.
13Select the Nonconventional option at the top.
14Enter HEAT as the new name at the bottom.
15Click OK.
The Properties | Parameters | Pure Component | HEAT | Input sheet appears.
16In the Parameter field, click 
and select HCOMB.
Note that the prompt indicates that HCOMB is the heat of combustion on a dry basis. Use the following equation to convert the heat of combustion on a wet basis to a dry basis:
HCOMB = Heat of Combustion (wet) * |
100 |
100 − % Moisture |
17In the first line under the Nonconventional component parameter column, click 
and select COAL.
18In the parameter value field directly below COAL, enter the heat of combustion on a dry basis: 11700 Btu/lb.
19Click 
to continue.
The Required Properties Input Complete dialog box appears.
20Click OK to access the next required input sheet.
Getting Started - Solids |
Modeling Coal Combustion • 3-9 |