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3000 7.18

3000 7.18

INCINERATION OF CELLULOSE AND SURROGATE SOLID WASTES 653 Table 15.7 Molal Mass of Product Gases from Pyrolysis of Cellulose

Molal Mass (kg/kmol of cellulose)

Pyrolysis temperature (K) 800 2000 3000 4000 5000 6000

Gas molal mass 25.268 18.008 14.392 11.110 10.221 9.860

Temperature (K )

Figure 15.8. Gas species generated from pyrolysis of surrogate waste No. #2.

Temperature (K )

Figure 15.8. Gas species generated from pyrolysis of surrogate waste No. #2.

Chemical equilibrium calculations were carried out for the pyrolysis of surrogate solid waste and its excursions at different temperatures [35-37]. The number of species can be selected depending on the data file. However, in the present study only 20 species were considered for the STANJAN code. The calculated results are shown in Figures 15.8-15.10, which include pyrolyzed gas composition (Fig.15.8), gas heating value (or energy recovery; Fig. 15.9), and pyrolyzed gas generation rate (or solid residue fraction; Fig. 15.10) as affected by the pyrol-ysis temperature. The results have been compared with cellulose pyrolysis. The effect of temperature on gas composition, gas yield, and gas heating value during pyrolysis of surrogate solid waste are similar in trend to those obtained for cellulose pyrolysis. High heating value of the pyrolyzed gases is produced at high temperatures from the surrogate solid wastes as seen from Figure. 15.9. At temperatures below 3000 K there is a large percentage of H2, CO, and CO2 in the pyrolyzed gas. The increase of low-molecular-weight gases at temperatures greater than 3000 K causes a dramatic increase in the overall volume of the gas produced, as seen from Figure. 15.10. The results obtained have shown that

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