P r o j e c t s

Biogas projects

Envirowaste Services Limited Hampton Downs Landfill Gas Project Location: Hampton Downs Landfill, Waikato Application: Power Generation from Landfill Gas The first stage of this project involved the supply, packaging, installation and commissioning of a pair of Generator Modules. Each module comprises a Waukesha APG1000 Enginator, rated for 1,000kWe continuous duty on landfill gas. The modules are self-contained power stations, requiring fuel gas and electrical connections. Included within the modules are dump heat radiators, PLC control/switchgear panels, ventilation fans, exhaust systems, plus oil and water tanks.
Mighty River Power & H.G. Leach Joint Venture Tirohia Landfill Gas Project Location: Tirohia Landfill, Hauraki District Application: Power Generation from Landfill Gas Entec's scope of supply on this project was to provide a Waukesha APG1000 Power Generation Module, and a Blower Drier Module. Both modules were packaged within modified ISO shipping containers, allowing rapid and cost-effective installation on site. The Blower Drier module comprises a gas blower, which provides the suction to extract LFG from the landfill. The compressed gas is passed through a refrigerated heat exchanger and filtration system, designed to remove moisture and particulate from the raw gas. The treated gas is then re-heated before transmission to the gas engine. The Generator module contains a Waukesha APG1000 Enginator package, generating 1,000kWe at 1,500 rpm.
Cavite Pig City Location: Cavite, Philippines Application: Cogeneration from Digester Gas on a Piggery Entec packaged a Waukesha APG1000 Enginator system into a modified 40' shipping container. The Enginator produces up to 1,100kWe of electrical power, running on biogas generated within a digester at this large, modern pig farm. The completed package includes a dump heat radiator, PLC controls, switchgear panel and heat recovery equipment. Heat is recovered from the engine jacket and high-temperature intercooler circuits, and circulated throughout some of the pig houses. The containerised unit is a self-contained cogeneration module, requiring only a fuel gas source, electrical and water connections. The unit was commissioned in early 2009.
Christchurch City Council QEII Sports Complex Cogeneration Plant Location: Christchurch Application:Cogeneration from Landfill Gas Entec successfully tendered to the Christchurch City Council in 2006 to supply, install and commission a gas engine cogeneration plant. The plant is installed at the Council’s large, multi-purpose QEII Sports Complex. QEII was built for the 1974 Commonwealth Games and is Christchurch’s premier venue for swimming and athletics. The cogeneration plant uses gas piped from the Burwood Landfill, a distance of approximately 4 kilometres away. The cogeneration package has an electrical output of 230kW and a thermal output of 384kW. This gas is also used in a pair of hot water boilers, so that the landfill gas supplies all of the heat and approximately half of the electricity consumed withinthe site. Entec’s scope of supply included the Waukesha gas engine. Enginator package, dump heat radiator, exhaust heat recovery unit and the control/switchgear panel. In addition Entec provided a turnkey mechanical and electrical installation, followed by commissioning and testing. The plant was officially opened in June 2007.
Green Energy Limited Horotiu Landfill Gas Power Station Location: Waikato Application: Power Generation from Landfill Gas Entec was retained in 2004 to provide equipment, design and installation/commissioning services to Green Energy. Green Energy had in turn been awarded an EPC contract by the WEL Green Energy Joint Venture for the turnkey supply of a 900kW landfill gas power station. Entec´s scope in this project included the design and specification of the plant building, landfill gas blowers, gas conditioning system, control and switchgear panel, and gas engine generator set. A Waukesha VHP5904LTD Enginator package was selected for this application, with a continuous rating of 900kWe. Entec also provided a comprehensive design, and mechanical/electrical installation service, culminating in handover of the plant in November 2004.
Pukete Cogeneration Project Location: Hamilton Application: Cogeneration, Digester/Natural gas fuel mixture Entec Services was awarded a contract by NGC in April 2000 to refurbish two Waukesha gas engine generator sets (ex Anchor Te Rapa dairy factory) to zero hour condition. The engine generator sets were model VHP7100GL, with electrical output of 920 kWe each. The contract called for the units to be redeployed to the cogeneration plant at Hamilton City Council´s Pukete Wastewater Treatment Plant. Entec´s scope in this project included civil works and modifications to an existing building on the Council´s site, and involved the full system design encompassing fuel supply (blending a mixture of digester gas with natural gas), electrical generation, controls and heat recovery to the plant. Engine controls and switchgear were supplied by Schneider. The project was completed on time and handed over to the client at the beginning of November 2000. The cogeneration units provide all of the treatment plant´s electrical energy and the majority of the plant´s heat load. Surplus electricity is exported to the local network. By incorporating the cogeneration controls into the site´s electrical load shedding system, the generators are able to provide "no break" supply to the plant in the event of a grid interruption. In addition to the turnkey project contract, Entec Services has entered into a long term contract to provide all planned and unplanned maintenance services to the cogeneration plant. Entec is committed to attending to any incidents within a two hour response time, 24 hours per day.
Landfill gas power generation Location: Auckland and Wellington Application: Power generation from landfill gas In 1991 Entec Services Limited were selected by the Auckland Electric Power Board as the main contractor for their Landfill Gas Power Projects at the Rosedale and Greenmount sites in Auckland, and the Silverstream landfill in Upper Hutt. The AEPB later became Mercury Energy, which in turn became Mighty River Power. The Rosedale and Greenmount stations are owned by a joint venture between Mighty River Power and Envirowaste Services. The Silverstream station is owned by a joint venture between Mighty River Power, Natural Gas Corporation and Hutt City Council. Rosedale and Greenmount This contract was for the supply of nine Engine Generating Sets, each producing 920 kilowatts electrical output, complete with control systems, heat rejection equipment and all ancillary equipment. The Engines utilised for this application are standard Waukesha lean burn type gas enginators, model VHP7100GLD. Some of the internal engine components have been specially designed to operate with the corrosive landfill gas. The first six units were commissioned in February 1992 with the additional three units commissioned in August of the same year. This is Entec´s single largest project to date and both stages were completed on budget and ahead of time. The units have now operated for some 80,000 hours each. Entec has carried out all planned and unplanned maintenance on the nine units from start up to the current time. Silverstream The successful installation, commissioning and operation of the Rosedale and Greenmount projects led to Entec again being selected to develop a similar power station at the Silverstream site in Upper Hutt. Entec´s supply for this installation consisted of three Waukesha VHP7100GLD Enginators, controls, switchgear and heat rejection equipment in the form of vertical radiators. The station was commissioned in 1994.
Christchurch City Council Location: Christchurch Application: Cogeneration from digester gas Entec Services supplied and installed a Waukesha 8LAT27GL cogeneration package at the Council´s Bromley wastewater treatment plant, with commissioning taking place in January 1996. This unit operates on digester gas, and is rated for a continuous output of 1,550 kWe. Entec´s scope of supply included the engine generator set, fuel gas compressor, heat recovery equipment and a full controls and switchgear package.
Hamilton City Council Location: Hamilton Application: Cogeneration from digester gas Entec Services installed and commissioned a Waukesha VHP2900G cogeneration package at the Council´s Pukete Road wastewater treatment plant in 1985. This unit operates on digester gas, and is rated for a continuous output of 230kWe. Engine controls and electrical switchgear were supplied by Schneider. The Waukesha engine achieved in excess of 50,000 hours before a cylinder head overhaul was required. This unit is fitted with a data logger, which shows the system availability to be in excess of 98%. The system operated for a total of some 110,000 Hours before being made redundant by the new cogeneration plant described above.
North Shore City Council Location: Auckland Application: Cogeneration from digester gas Entec Services installed and commissioned a Waukesha VHP2900G cogeneration package at the Council´s Rosedale Road wastewater treatment plant in 1984. This unit operates on digester gas, and is rated for a continuous output of 230kWe. Engine controls and electrical switchgear were supplied by Schneider. The first top end overhaul was carried out at 38,000 hours and the unit operated in excess of 87,000 hours, prior to being decommissioned to make way for a new cogeneration unit.

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