The Digester Gas Utilization Project (DGUP) is a combined cycle, cogeneration configuration that is widely used for power generation projects. The combination of the Rankine and Brayton thermodynamic cycles is a proven process. The Project will be engineered, designed and fitted to use the full amount of Hyperion Water Reclamation Plant (HWRP) digester gas in a manner that is intended to meet the electric power and steam needs of the HWRP, as well as the new air emissions permit requirements for the Project.
The Project will produce the required amount of electric power and steam to serve the current needs of the HWRP and use all of the currently available digester gas. It is based on the installation of two new Solar Mars 100-16000 Combustion Turbine Generators (CTG's) built and packaged by Solar Turbines.
Each CTG has a nominal 11.35 MW power output as measured at the generator terminals at ISO conditions. Each CTG is provided with a dedicated heat recovery steam generator (HRSG). A single extraction/condensing steam turbine generator (STG) unit is provided to produce additional electric power from HRSG steam and to supply lower pressure steam for HWRP use through a STG extraction port. These prime movers will be complemented by a complete set of Balance of Plant (BOP) systems and equipment. This arrangement would allow the Project to follow the HWRP steam demand and use all remaining steam for additional electric power production.
The Project will consist of the following major systems:
The City is anticipating that future additions will be made to the HWRP to further treat incoming Fats, Oils, and Grease (FOG). These modifications are expected to significantly increase the amount of HWRP digester gas available, and increase the HWRP demand for electric power and steam.
To accommodate the additional digester gas flow and address these additional demands, the Project is engineered, designed and constructed to accomodate the future installation of a third 11.35 MW CTG/HRSG train and a one MW backpressure STG and ancillaries (not included in this project) to allow the consumption of the additional digester gas and produce the necessary additional electric power and steam for the HWRP.