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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 33. Energy Consumption for Key Chemicals PVC Nitrogen Oxygen Ammonia Urea Chlorine Total Product Ethylene & co-products Methanol Polyethylene Polypropylene Specific Energy Consumption (GJ/tonne) 67.5 38.4 9.3 10.5 11.6 1.8 1.8 39.8 2.8 19.2 1994 Production (Mtons) 26.2 4.9 5.7 4.4 5.4 28.6 22.7 16.2 7.6 11.1 Total Energy Use (PJ) 1768 188 53 45 62 49 44 645 21 213 3112 % of SIC 28 Energy Use 29.3 3.1 0.9 0.7 1.0 0.8 0.7 10.5 0.3 3.5 51.5 Table 34 is an example of the various units used to denote energy consumption. Some of the energy is used as fuel, while some is used as electricity. The energy content is represented as LHV or HHV. The energy intensity is sometimes normalized to the fuel used for energy, while at other times, it is normalized to the sum of fuel + feedstock. Sometimes, the energy intensity is normalized to primary energy, where the amount of fuel corresponding to electricity is calculated using 33% efficiency. Table 34 gives an example of these representations for ethylene, ammonia, and chlorine production. Table 34. Various Energy Units Used to Represent Energy Use in the Chemical Industry The Worrell report gave a detailed energy breakdown for various processes used to produce ethylene, ammonia, and chlorine; however, no emissions data were given. Using the energy consumption data from Tables 23-26, we can calculate CO2 emissions and CH4 emissions with the appropriate emission factors. During chlorine production, hydrogen is released at the cathode. This hydrogen could be captured and used in a fuel cell to provide some of the electricity needed for the elec- trolysis cell. According to Table 17 of [9], the total electricity used for chlorine production was 173 PJ, out of which 150 PJ was consumed by electrolysis. The fuel use was 38 PJ, for a total energy consumption of 211 PJ. The energy content of hydrogen generated was 3.4 PJ. Assuming a fuel cell is 50% efficient, this can provide 1.7 PJ of electricity, or ~ 1% of total electricity needs for chlorine production. Chemical Fuel Energy Feedstock Energy Intensity, Electricity Used Intensity Used (PJ) Including Feedstock, (kWh/ton) (PJ) LHV (GJ/tonne) HHV (GJ/ton) Ethylene 520 26 Ammonia 268 368 39.3 Cl2 production 38 47.8 4380 30

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