Exergy Analysis of Reacting and Psychrometric SystemsFigure P13.104 shows a coal gasificat...

Exergy Analysis of Reacting and Psychrometric Systems

Figure P13.104 shows a coal gasification reactor making use of the carbon-steam process. The energy required for the endothermic reaction is supplied by an electrical resistor. The reactor operates at steady state, with no stray heat transfers and negligible effects of motion and gravity. Evaluate in Btu per lbmol of carbon entering

(a) the required electrical input.

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(b) the exergy entering with the carbon.

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(c) the exergy entering with the steam.

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(d) the exergy exiting with the product gas.

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(e) the exergy destruction within the reactor.

Perform calculations relative to the environment of Problem 13.91.

Fig. P13.104

Problem 13.91

Using Chemical Exergy

Applying Eq. 13.36 for (a) carbon, (b) hydrogen (H2), (c) methane, (d) carbon monoxide, (e) nitrogen (N2), (f) oxygen (O2), and (g) carbon dioxide, determine the chemical exergy, in kJ/kg, relative to the following environment in which the gas phase obeys the ideal gas model:

(13.36)