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Chapter 3 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0.10 1.00 Lean Burn Engine Advanced Lean Burn Engine 10.00 100.00 Fuel Input, MMBtuh Gas Turbine Microturbine Recuperated Gas Turbine Molten Carbonate Fuel Cell 1,000.00 Figure 3-4. Prime Mover NOx Emissions All of the data used to generate Figures 3-1 through 3-4 is based on information gathered from prime mover manufacturers and the authors’ experience. Product data for several prime movers is included in the appendix. 3.2 Prime Mover Preliminary Selection As previously stated, the purpose of the diagrams presented in this chapter is to assist POTW decision makers in making a preliminary prime mover selection. When considering the various types and sizes of digester gas-fueled prime movers available, the POTW should first establish the quantity of digester gas that is available for use in the CHP system to get a general sense of the possible electric power generation capacity of the system. In most cases POTWs should select a prime mover option that consists of multiple smaller units that, when combined, can accommodate the available digester gas while also providing the flexibility to remove a unit from service for maintenance or when digester gas production is low. Once the preliminary size range of the prime mover has been established, the POTW should evaluate its heat recovery needs and ensure that the selected prime mover can provide the heat required. The form or type of recoverable heat is important and should be carefully considered. In most cases, only combustion gas turbines can reliably produce high temperature, high pressure steam. The other commonly used types of prime mover are suitable for producing high temperature and low temperature hot water. An understanding of heat recovery needs and actual heat recovery options should help the POTW narrow the selection of a 3-5 NOx, lb/MMBtuPDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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