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Powerhouse Waste Heat to Energy Project Final Report to the Cain unit. Furthermore, maintenance service for this unit is very difficult as maintenance access is only available with major disassembly, cleaning, and reassembly of the unit. This would also require crane time and coordination. Support, however, is available relatively locally. o Aalborg This exhaust gas boiler unit manufacturer produces a unit that can provide hot water temperatures that would be needed for this project. Aalborg makes a low weight, compact, easy to maintain, highly efficient, proven design, tailor-made for specific requirements, designed for diesel applications, vibration resistant units. They can provide many references for similar installations. However, Aalborg does not offer an integral exhaust bypass valve and check valve for use with existing exhaust systems. Also, a third party controls/monitoring instrumentation package would need to be developed and integrated into this boiler unit adding further cost and complexity. Approximate material cost only per boiler plus third party controls is $320,000. 2. FacilityEvaluation ([LVWLQJ3RZHUKRXVH&RQFUHWH2OGDQG6WHHO1HZ EPSI looked at each of the existing generator units at each powerhouse to determine if the individual heat inputs to the “system” would be viable sources to size the ORC units to be as large as possible. There are two heat sources from which the waste heat project is being developed 1) Engine jacket 2) Exhaust Gas. Both heat sources will require the use of ORC units. While there is much more heat energy to reclaim through the exhaust gas than engine jacket the exhaust gas system will require additional equipment over the engine jacket system. Currently, Units 10, 11, and 13 (new plant) are connected through common engine jacket water waste heat lines and are available for electric conversion according to the BTU amounts shown below in this section of the report. In the old powerhouse building, Units 1 through 6 have been decommissioned and removed. Units 8 and 9 in the old powerhouse and Units 10, 11, and 13 in the new powerhouse are currently in service. All are of a size to provide sources for the ORC units to a certain degree especially with the addition of an exhaust heat recovery system. However, units 8 and 9 are not connected to the existing engine jacket waste heat lines and are expected to be decommissioned and removed in the near future. Therefore, units 8 and 9 are not evaluated for waste heat reclamation potential within this report. Currently, units 10 or 11 are typically base load units, with Units 8 or 9 supporting the remaining loads. Therefore only Units 10 and 11 are considered for exhaust gas waste heat evaluation within this report. In the future, it may be further beneficial to expand the exhaust waste heat system to include additional units as they are run on a more regular basis. Town loads need to be consistently around 7 MW minimum before unit 13 with unit 10 or 11 OR both Wartsila’s would need to be regularly dispatched. Current loading still remains between 5 MW to 7.5 MW where 7.5 MW is rarely approached. 10/22/2012 P a g e | 2-7PDF Image | Powerhouse Exhaust Gas Waste Heat to Energy Project
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