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Combined Heat and Power Technologies for Wastewater Facilities

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Combined Heat and Power Technologies for Wastewater Facilities ( combined-heat-and-power-technologies-wastewater-facilities )

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Chapter 3 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities overhaul, but is rarely included in O&M costs. Though typically not included in O&M cost figures, fuel cell O&M costs should include the annualized cost of cell stack replacement. While not included in prime mover O&M costs, POTWs should carefully consider the cost of digester gas treatment when designing a CHP system and selecting a prime mover. Digester gas treatment costs can range from $0.015 to 0.025 per kWh. Digester gas composition, in particular hydrogen sulfide (H2S) concentration, is a large contributor to the overall CHP system O&M cost. 3.1.3 Prime Mover Emissions Because fuel cells do not involve combustion, per se, they are clearly the cleanest CHP technology in terms of CO and NOx emissions. This is due to the fact that fuel cells rely on an electrochemical conversion process to generate electric power and heat from digester gas. Internal combustion engines, combustion gas turbines, and microturbines are combustion technologies and as a result produce higher emissions. However, several emissions control technologies are available for use with combustion equipment that can significantly lower emissions to meet regulatory requirements. The data presented in the following charts for combustion technologies represent the range of emissions achievable with and without controls. 2.50 2.00 1.50 1.00 0.50 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 3-3. Prime Mover CO Emissions 3-4 CO, lb/MMBtu

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