Utilidades industriais/Gases industriais/G\303\241s de combust\303\243o.md ..
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*Figura 1-* Combustion reaction
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Whereas $ F^(in) $ and $F^(out) $ are the inlet and outlet molar flows of the component \( i \), respectively; \( \alpha \) is the excess coefficient (e.g., if the air excess is 20%, \( \alpha \) is equal to 1.2); and \( y_i \) is the molar fraction of component \( i \) in the flue gas. It is considered that the molar composition of the air is 79% nitrogen and 21% oxygen.
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Whereas $F^(in)$ and $F^(out)$ are the inlet and outlet molar flows of the component \( i \), respectively; \( \alpha\) is the excess coefficient (e.g., if the air excess is 20%, \( \alpha \) is equal to 1.2); and \( y_i \) is the molar fraction of component \( i \) in the flue gas. It is considered that the molar composition of the air is 79% nitrogen and 21% oxygen.
Since the combustion is a very exothermic reaction, it will release heat. The heat generated will provide the thermal energy needed in the plant. Additionally, the gases produced will be in a very high temperature. These hot gases can be used to provide further thermal energy in other parts of the industrial plant. The temperature of the product gases will depend on the fuel used, and the operating conditions and purpose of the combustion unit. In boilers, for instance, the temperature of the forming gases will reach between 150 °C – 260 °C. In an incinerator, this temperature can reach values as high as 1000 °C. Table 1 obtained from [3] illustrates some temperature ranges depending on the combustion unit.
