Heat and material balances for sludge incineration can be divided into two (2) broad categories:
Autogeneous - no auxiliary fuel required
Non-autogeneous - auxiliary fuel required to during
steady state operation at desired temperature and XS air.
The method of solution for these two problems will be shown by way of the illustrative examples below.
As shown in the co-paper on Combustion
Fundamentals, the enthalpy of flue gas
is not a linear function. The literature contains several mathematical expressions that can be used to express this change over a given range of temperatures. For this Manual of Practice, straightforward fourth power polynomial equations to a 60°F base have been selected as the most functional.
Unfortunately, neither these equations, nor the other enthalpy equations found in the literature, lend themselves to a direct solution when trying to calculate a temperature from an enthalpy value. The easiest and most common way to solve this problem is by using a trial and error solution.
Before starting the first illustrative example, the Table of Molecular Weights from Combustion
Fundamentals is repeated below for reference.
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