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Chapter 6 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities currently not capturing any heat for digester or other process heating. The original HRSG units have since been removed and new HRSG units will be installed as part of the steam turbine replacement project. Digester-gas-fueled steam boilers are currently used to heat the anaerobic digesters. During the warm summer months only two boilers are needed to maintain appropriate digester temperatures. However, winter operations typically require the use of three, and sometimes four, boilers. An additional steam boiler fired on natural gas is also available for backup service. Figure 6-7. Heat Recovery Steam Generators at the JWPCP 6.2.4 Operation and Maintenance The combustion turbines are overhauled approximately every 35,000 hours of operation. At the specified interval, plant staff remove and replace the rotating turbine section with an overhauled turbine. The old turbine is then shipped back to Solar Turbines for subsequent overhaul. This program has worked very successfully for the JWPCP and has kept the turbines in near constant operation since their original installation in 1985. While not normal operating procedure, one turbine was once left in operation for over 50,000 hours prior to being overhauled. Plant staff report that the turbine continued to operate very successfully beyond the 35,000 hour milestone with no reduction in efficiency and no siloxane damage. Routine maintenance is successfully performed by JWPCP staff. The combustion turbines are designed for dual fuel operation. Diesel fuel is used to “black” start the combustion turbines. Under the current operating scenario a significant amount of digester gas is used to fuel the steam boilers. Because of this it is necessary to blend more natural gas with the remaining digester gas in order to ensure that two combustion turbines are able to simultaneously operate at full output. Table 6-1 provides a summary of the JWPCP’s CHP system performance and is based on operational data for 2008 provided by LACSD. At the time of the site visit, Turbine #1 was out of service for routine 6-8PDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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