Variables
Again ignoring sulfur, nitrogen, and others initially, it is necessary to define eight variables for the heterogeneous case and seven for the homogeneous one to provide a mathematically soluble problem. Five variables that virtually always apply in gasification are the gas component fractions in the synthesis gas for:
C02, CO, H2, CH4, and H20.
The remaining three variables in case of heterogeneous gasification and two in the case of homogeneous gasification may be selected from the following list:
• Fuel used per kmole product gas.
• Blast (oxidant) used per kmole product gas.
• Moderator (mostly steam) used per kmole product gas.
• Heat loss from the gasifier reactor or heat required for the gasification.
• Gasification temperature (though any result would need to be checked in respect of the ash properties).
