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Project Design, Contractor Selection, and Construction Preliminary design work was performed by a local engineer. The focus of the effort was to determine if implementation of CHP would be cost-effective for the WWTF, given the existing electric rate structure, capital costs, and the required maximum payback period. The initial basis of design included the following components: o Two – 30 kW micro-turbines o Continuous generation for 1 microturbine o Additional peak shaving for 2nd microturbine o Natural gas and methane blending option o 3 Phase 480 volt generation o Operate parallel to the utility, reduce purchased electricity o UL 1741 protection for voltage & Grid Although the municipality had completed initial design work, the RFP was structured to allow for alternate designs. It included a large amount of information for potential bidders in order to solicit the best possible performance and allowed a bidder to propose a system based on the preliminary design, or to propose an alternate design. The RFP was written such that the selected contractor would enter into a performance-based, design/build contract. In order to generate quality system designs, the following facility background information was provided in the RFP: o The WWTF generates an average of 30,300 cu.ft./day of methane o The facility’s methane has a typical energy content of 520 btu/cu.ft. Additional RFP content included system requirements and evaluation priorities. o The system should emit no additional pollutants(i.e., SOx, NOx, methane) compared to the current practice of flaring methane o The system must remove siloxanes to protect equipment operation and life (e.g., heat exchanger, microturbines) o The electrical system interconnect must meet utility requirements and safety protocols (e.g., no power feed onto grid during power outages) o Generated power must be line-synchronized with grid-supplied power to maintain power quality. o The system must not exceed facility maximum allowed noise levels, based on nearby residences and neighborhood park. o The system must be highly reliable and require minimal maintenance that can be performed by facility personnel at reasonable cost. o The system must meet all relevant permit and other federal, state and local requirements Bids came in more than $90,000 higher than expected (low bid cost of $275,000 v. estimated cost of $184,000). The higher initial cost meant that the project did not meet the sewer facility governing board 7-year payback requirement to move forward. Many projects may have simply been abandoned at this point. The key difference in the Essex Junction project is thatPDF Image | Turning Methane into Money: Cost-Effective Methane Co-Generation Using Microturbines at a Small, Rural Wastewater Plant
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