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Additional info for Thermodynamics: Second Law Analysis
6 Btu/lb coal To calculate the consumptions of available energy in the combustion process and the heat transfer process, it is supposed that the boiler may be separated into two distinct entities (Figures 4 and 5). The transports of available energy into the combustion process with a i r , steam, feedwater and stack gases have already been determined. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1980. THERMODYNAMICS: SECOND LAW ANALYSIS 1 AIR COMBUSTION PROCESS COAL ? 101 MPAI Figure 4.
2 Btu/lb coal kg coal For convenience, the system boundary has been located far from the stack, so that the stack gases have (virtually) been f u l l y dispersed. Thus, the available energy of the dispersed stack gases leaving the system is practically zero; À , = available energy of dispersed stack gases = 0. G This a r t i f i c e avoids th loss at the stack exit , energy tion with the system w i l l include that loss—inasmuch as the lost available energy is ultimately consumed (destroyed) by the dispersion process.
A l l correlations between chemical a v a i l a b i l i t y and lower heating value in terms of either atomic or mass ratios were based on values calculated for dry fuels with no moisture content. However, in applying those equations to fuels whose heating values do not appear on available tables, it is quite possible that the experimental determination of such value would be achieved by burning moist fuel in a calorimeter without f i r s t drying the substance. Care should then be exercised not to use the heating value of moist fuel in formulae derived for dry fuels.