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Figure 14. Heat Recovery Potential with a Condensing economizer System [9]. The example system consists of a boiler which is providing steam to be used as process heat for the client, this boiler produces 6,000 pounds of 100 psig saturated steam per hour. The exhaust gas temperature directly from the boiler is 530°F and leaves the initial economizer at a temperature of 320°F. The flow is then directed to either exhaust into the atmosphere or pass through the condensing economizer. This flow is split with 51% going to the condensing economizer and the remaining 49% exiting the system to the atmosphere [9]. With this described system, about 1.74 MMBtu/hr of energy is exhausted from the boiler in the form of waste heat. This heat is then passed through the sensible heat exchanger and about 0.43 MMBtu/hr can be recovered, or about 25% of the waste heat energy. The flow is then split between the condensing economizer and exhausting to the atmosphere. The condensing economizer is capable of recovering an additional 0.39 MMBtu/hr which means that with both heat exchangers installed, 0.82 MMbtu/hr can be recovered which is 47% of the total wasted energy. If the sensible heat exchanger is removed from the system, the condensing economizer by itself is only able to recover 0.44 MMBtu/hr which is just slightly more than the sensible heat 37PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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