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Chapter 2 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities efficiency of boiler/steam turbine CHP systems limit their use in smaller POTWs. For these reasons boiler/steam turbine CHP systems will not be given further consideration beyond this chapter. 2.5.2 Heat Recovery As previously stated, steam turbines require a separate source, typically a steam boiler, to provide the high pressure, often superheated, steam required for operation. However, heat recovery from steam turbine systems does not occur at the steam source. Instead, heat recovery occurs by extracting heat from the steam only after it has been exhausted from the steam turbine. The recovered exhaust steam can then directly heat the anaerobic digesters. Another heating option is to first convert the exhaust steam to hot water for indirect heating applications. 2.5.3 Exhaust Emissions Emissions from steam turbine based CHP systems are a direct result of fuel combustion within the boiler. Boiler exhaust emissions consist primarily of CO, NOx, SOx and PM. A steam turbine and steam boiler CHP system is shown on Figure 2-10. Figure 2-10. Process Flow Diagram of Typical Boiler and Steam Turbine System Some of the advantages and disadvantages associated with steam turbine/steam boiler CHP systems are summarized in Table 2-5. 2-18PDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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