Analysis for Recovering Energy from Industrial Waste Heat

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Analysis for Recovering Energy from Industrial Waste Heat ( analysis-recovering-energy-from-industrial-waste-heat )

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1 SURVEY OF CHEMICAL EMISSIONS Table 25. Methane Emissions from Fuel Usage for the Year 1998 from Each Sub-Sector Metals Paper Food Glass Industry Petroleum Chemicals Other manufacturing Total SIC Code 28 33 26 20 32 No Code 7.7 2.5 0.1 0.8 0.1 0.2 0.4 11.8 Methane Emissions (Gg) 5.6 13.2 3.3 4.4 2.5 1.6 5.1 35.9 By Fuel Used 29 Petroleum Natural Gas Coal 0 5.9 13.9 7.8 2.3 4.1 1.8 35.7 Other 43.7 3.0 1.4 0.7 0.4 0.3 0.8 50.3 Total 57.1 24.6 18.7 13.7 5.3 6.2 133.7 8.1 Table 25 shows the CH4 emissions for the year 1998 from each sub-sector. The detail surrounding these calculations can be found in Appendix B. Since agriculture, mining, and construction were excluded, the CH4 emissions in Table 23 are less than that obtained in Table 24 using the EIA 2003 Annual Energy Review [5]. As mentioned earlier, due to the uncertainty involved in the industrial emission values from stationary combustion, this analysis was undertaken in order to show the viability of data presented in Tables 19-23. We calculated the CH4 emissions value using fuel consumption data available from various sources and compared the computed values with the data presented in Table 19. Table 26 summarizes the computed results for years 1990, 1995, 1998, and 2001 using two computational approaches. The relative agreement between this data with that of Table 19 for all three data sources lends confidence to these numbers. Furthermore, they prove that according to these approaches, little residual chemical fuel value resides in combustion-related industrial emissions. It should be noted that the data corresponding to fuel consumption for both electricity and industrial processes serves only to provide an upper bound estimate on methane emissions. The same emission factor for methane cannot be used when the fuel is used just for industrial processes. 24

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