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Chapter 6 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities Figure 6-6. Silica Deposits on Duct Work at the JWPCP The current NOx limit of 25 ppm is met by water injection into the turbine combustors. Water injection is carefully controlled to maintain compliance with SCAQMD regulations. The turbines are equipped with continuous emissions monitors (CEMS). 6.2.2 Power Generation As part of the maintenance agreement with Solar Turbines, the combustion turbines are periodically overhauled and sometimes replaced with improved turbines. As a result, each turbine is now rated for 10 MW of electrical output. Current operations limit each combustion turbine’s electrical output to nearly 9 MW. At times, the total plant electrical output approaches 18 MW, making the JWPCP nearly energy self sufficient. The plant is regularly able to “break even,” which means that it often does not import electricity from the local electrical utility. Onsite electric power production results in savings to the plant of over $1 million per month. Prior to its failure, the steam turbine-driven generator was producing approximately 3 MW of power. Replacement of the old steam turbine and generator is in progress. A new Shin-Nippon steam turbine and Ideal generator, rated for 8.7 MW, along with a heat recovery steam generator (HRSG), have been installed and will replace the old steam turbine system and once again enable combined cycle operation. Start-up of the combined cycle is scheduled for some time in late 2011. The total project cost for the new steam turbine system is approximately $25 million. 6.2.3 Heat Recovery Each combustion turbine is equipped with a HRSG capable of producing steam at 450 psig. The combined cycle power plant also includes a reheat boiler which, by utilizing extraction steam from the steam turbine, produces low-pressure steam for digester heating. However, since the failure of the steam turbine-driven generator, the HRSG units and reheat boiler have not been used. As such, the combined cycle power plant is 6-7PDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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