33.3.18 Coal Calculator Dialog Box

The Coal Calculator dialog box automates the calculations described in Section  16.4.5 for setting up a coal case from the proximate and ultimate analyses.

Proximate Analysis   is the mass fraction of Volatile, Fixed Carbon, Ash, and Moisture in the coal.

Volatile   is the fraction of the volatile component.

Fixed Carbon   is calculated as one minus the sum of the actual Volatile, Ash, and Moisture fractions.

Ash   is the fraction of ash.

Moisture   is the moisture fraction in the coal.

Ultimate Analysis (DAF)   is the mass fraction of atomic C, H, O, N and optionally S, in the Dry-Ash-Free (DAF) coal.

Mechanism   allows you to set the mechanisms.

Secondary Stream   when enabled, allows you to set the two mixture fraction model with the primary stream representing char as $C<s>$, and an empirical secondary stream representing the volatiles. This is available when using the non-premixed combustion model.

One-step Reaction   is defined in Equation  15.1-3.

Two-step Reaction   involves oxidation of volatiles to $CO$ in the first reaction and oxidation of $CO$ to $CO_2$ in the second reaction, as decsribed in Equation  15.1-4.

Include SO2   when enabled, allows you to input the atomic mass fraction of sulphur, S, which appears under Ultimate Analysis.

Options   

Wet Combustion   when enabled will activate the DPM Wet Combustion option by default in all injections created after the OK button is clicked in the Coal Calculator dialog box.

Settings   is where you will specify the values used in the calculation.

Coal Particle Material Name   is the name of the DPM combusting particle material. The default name is coal-particle.

Coal As-Received HCV   is the higher caloric value of the coal.

Volatile Molecular Weight   is the molecular weight of pure volatiles.

CO/CO2 Split in Reaction 1 Products   can be used to specify the molar fraction of $CO$ to $CO_2$ in the first reaction of Equation  15.1-4. The default value of 1 implies that all carbon is reacted to $CO$, with no $CO_2$ produced.

High Temperature Volatile Yield   is where the enhanced devolatization at higher temperatures can cause the volatile yield to exceed the proximate analysis fraction.

Fraction of N in Char (DAF   is used in calculating the split of atomic nitrogen for the Fuel NOx model.

Coal Dry Density   is used to calculate the Volume Fraction of liquid-water for the Wet Combustion option in the Injections dialog box.

Gas Phase Reaction   lists the reaction based on your entries for the proximate and ultimate analyses.