GE Energy has launched a Jenbacher gas engine that it claims is suitable for 60 Hz applications running at 1800 rpm to serve the high-efficiency power generation, co-generation and onsite power segment in North America. The USA giant’s new J420 GS model will offer very high efficiency at high specific outputs with 1800 rpm, suitable for natural gas and a variety of other gases, such as landfill gas, biogas, sewage gas, glare gas and coal mine gas.

The electrical output of the new model is 1.426 mW. Thermal output is around 5700 MBTU/hr when fuelled by natural gas and 5400 MBTU/hr with biogas.

Electrical efficiency is 40.8%, with a total engine efficiency of up to 86.6%. Key efficiency features include swirl-optimized, four-valve cylinder heads, a Miller timing combustion system and high-performance spark plugs. These features could lower fuel costs and increase operating periods for components, including cylinder heads to up to 30,000 hours and spark plugs up to 15,000 hours.

The first J420 for 60 Hz applications will be shipped in late 2006 and commissioned in early 2007, with the first field installation entering service during the first quarter of 2007.

Reader Reply No.100

Moving gear oils up a notch

Shell Lubricants has introduced a range of mineral and synthetic industrial gear oils formulated to prolong gear life and reduce unscheduled downtime. The Anglo-Dutch oil major claims that the new Shell Omala, Shell Omala HD and Shell Tivela S gear oils will allow equipment to run at higher operating temperatures, handle increased loads and cope with exposure to water and other contaminants.

Shell Omala is a mineral-based gear oil suitable for highly loaded gearboxes operating under normal temperatures. It has been designed to help extend component and oil life and is suitable for wet environments such as steel, mining and paper mills because of its water separation properties.

The synthetic oil Shell Omala HD has been designed to provide excellent low friction properties, reduce power losses and lower operating temperatures, which contribute to energy and cost saving benefits compared to gear oils manufactured from mineral base oils. It is based on poly-alpha-olefin that improves thermal and oxidative stability to minimize sludge formation and increases in viscosity.

Shell Tivela S is a high-performance synthetic gear fluid based on polyalkelene-glycol (PAG) technology and specially selected additives, designed for use in enclosed, sealed-for-life or worm-helical gear units operating at higher temperatures. A recent bearing wear test resulted in zero roller wear.

Reader Reply No.101

Silent wind turbine set to storm the market

A UK start-up has completed testing of an ultra-efficient, virtually silent wind turbine that works by accelerating the wind onto the blades thus improving performance at low wind speeds.

London-based Stormblade Turbine Ltd claims that its product, which contains fewer parts to reduce drag, can convert up to 70 per cent of wind power into electricity, double the current average. Operational wind speed is expected to be 7 mph to 120 mph, again double the current average.

Stormblade Turbine Ltd says that the turbine is unique in that it operates at extreme wind speeds, has more power per rotation, requires less maintenance and is a third of the size of comparable industrial wind turbines. Moreover, the propeller blades and all the moving parts are housed within the nacelle, therefore posing no danger to birds or bats.

The initial design and testing of the prototype is complete and, in conjunction with the London Manufacturing Advisory Service, the company is currently identifying potential partners to bring the design into production. Initial market research has identified at least 14 companies and support groups that have expressed an interest in the technology and would like to further explore collaboration opportunities.

Reader Reply No.102

Fuel cell test joy for Siemens

Siemens Power Generation has announced the successful testing of its latest solid oxide fuel cell (SOFC) technology that incorporates high power density technology being developed under the United States Department of Energy’s (DOE) Solid State Energy Conversion Alliance (SECA). A prototype 5kW-class complete system using the SECA technology has operated for 2800 hours, meeting or exceeding all of the technical and economic objectives for phase one of the SECA programme.

The successful operation of the SECA system recorded an unprecedented zero degradation of cell or system performance during an extended period of operation. Siemens plans to develop the high power density technology as part of a project that merges the subsequent phases of the SECA programme with DOE’s coal based fuel cell systems programme.

The ultimate objective of this project is for SOFCs to provide clean power fueled by synthetic gas from domestic coal resources as part of DOE’s FutureGen programme.

Reader Reply No.103

Beryllium-free EMI gaskets pass stiff tests

USA-based Laird Technologies has successfully tested its beryllium-free recyclable clean copper electromagnetic interference (EMI) shielding gasket to 500,000 cycles without product failure. The recyclable gasket combines strong stability with tensile strength to achieve high levels of thermal and electrical conductivity and elasticity, making it suitable for utilization in both grounding and shielding applications at a rate that is comparable to traditional metal EMI shields.

The gasket is made from recyclable clean copper that is fully compliant to EU RoHS Directive 2002/95/EC and alleviates the environmental, safety and segregation concerns associated with the traditional use and recycling of beryllium-based copper alloys.

This gasket material is characterized by high yield strength (up to 100 MPa) compared to other common copper alloys.

Reader Reply No.104