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Chapter 6




             Heat Recovery and Reuse





                1.0  INTRODUCTION             102            Preheaters           116
                2.0  CONSIDERATIONS IN HEAT                  4.1.1 Air Preheater
                    RECOVERY AND REUSE                            Operation       117
                    APPLICATIONS              104            4.1.2 Air Preheater
                    2.1 Potential Uses for Primary                Design          118
                         Energy Recovery      106            4.1.3 Tubes          119
                    2.2 Potential Uses for                   4.1.4 Tubesheets     119
                         Secondary Energy                    4.1.5 Expansion Joints  120
                         Recovery             107
                                                             4.1.6 Materials
                    2.3 Application                               Recommendations 120
                         Considerations       109
                                                             4.1.7 Long-Term
                         2.3.1 Gas Composition  109               Operation       120
                         2.3.2 Process                   4.2 Plume Suppression
                         Considerations       110            Heat Exchangers      122
                         2.3.3 Safety
                                                         4.3 Economizers          123
                         Considerations       112
                                                         4.4 Thermal Fluid Heaters 123
                3.0  HEAT REUSE
                                                         4.5 Waste Heat Recovery
                    APPLICATIONS              113
                                                             Boilers              124
                    3.1 Primary Energy                       4.5.1 Firetube Boilers  125
                         Recovery Systems     113
                                                             4.5.2 Watertube Boilers 125
                    3.2 Secondary Energy
                                                             4.5.3 Watertube Boiler
                         Recovery Systems     114
                                                                  Design          127
                    3.3 Typical Energy
                                                             4.5.4 Feedwater      127
                         Recovery Flow Sheets 115
                                                             4.5.5 Soot Blowers   128
                4.0  HEAT RECOVERY
                    TECHNOLOGIES              116   5.0  SUMMARY                  128
                    4.1 Recuperative Air            6.0  SUGGESTED READINGS       128


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