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Chapter 2 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities Figure 2-4 depicts the process flows associated with a typical simple cycle, combustion gas turbine CHP system without recuperation. Figure 2-4. Process Flow Diagram of a Typical Simple Cycle, Combustion Gas Turbine System without Recuperation 2.2.3 Exhaust Emissions In most jurisdictions, some form of exhaust emissions control is necessary for any proposed combustion gas turbine. Suitable emissions reduction technologies are usually one of three forms: 1. Dry,low-NOxcombustors–Thisisthenewestandoftenthemostattractiveemissionscontrol technology. In some cases it may be the only technology appropriate for digester gas operation. Most of the newer and the more advanced combustion gas turbines are available with dry, low-NOx combustors. However, not all combustion gas turbine manufacturers offer this new technology. It is expected that significant improvements to the dry, low-NOx units will be forthcoming. 2. Waterorsteaminjection–Wettechnologiessuchaswaterorsteaminjectiondirectlyintotheturbine’s combustion zone can substantially reduce a turbine’s NOx exhaust emissions by lowering combustion zone temperature. The tradeoff for lower NOx emissions is higher CO emissions. However, CO emissions can be controlled by using an oxidizing catalyst. Water and steam injection emissions control systems require a continuous consumption of high-quality water, which may be expensive to operate for some POTWs that do not have a high-quality water source. 3. Catalyticconverters–Thispost-combustiontechnologycanbeexpensiverelativetootheroptions,but more importantly, it should be used with complete gas treatment. Catalytic converters often follow water or steam injection for improved performance. 2-8PDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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