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STUDY OF LOW-GRADE WASTE HEAT RECOVERY

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TUDY OF LOW-GRADE WASTE HEAT RECOVERY ( tudy-low-grade-waste-heat-recovery )

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works by introducing a heat exchanger into the stack gas exit with a recovery fluid on one side of the exchanger to absorb the energy of the stack gas before it is exhausted to the atmosphere. This economizer is generally installed as a second heat exchanger in the exhaust stack and is only required to operate in a lower temperature range, potentially reducing the manufacturing cost. Figure 13. Condensing Heat Exchanger for Heating Boiler Feed Water [64]. The water vapor in the exhaust stream mentioned earlier is produced during the combustion process when hydrocarbons combine with oxygen. The most notable example of this is during the combustion of natural gas (CH4). The following chemical equation is a very simplified representation of what occurs during natural gas combustion [63]. CH4 + 2(O2 + 3.76N2) → 2H2O + CO2 + 7.52N2 As this equation shows, for every one molecule of natural gas burned, two molecules of H2O are produced and because this is a combustion process, temperatures are well above the boiling point of water. This produced water is immediately converted into steam and this change in phase of the liquid water to vapor consumes some of the combustion energy, about 970 Btu/lbm assuming 35

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