The supercritical CO2 power cycle is one of the most promising power technologies. It is not by chance though, because carbon dioxide (CO2) has a unique combination of attributes, such as a low critical temperature, an environmentally natural origin, a high standard of safety and a low cost.
GE is releasing air-cooled H-class gas turbines. Two versions will be available for the 50 Hz market (9HA.01 and 9HA.02), and two versions for the 60 Hz market (7HA.01 and 7HA.02). GE’s first steam-cooled H-class turbines also operate at more than 2600°F. But sales have not been as robust as expected.
Stick-built plants are said to offer the lowest cost to fabricate and ship to site. And stick-built construction is often chosen if the shipping of modules has to occur within a small window of favorable weather conditions, or because of local politics or labor constraints.
One of the problems that might have to be faced when operating steam turbines is shaft inflection, or rotor bowing, a condition that can be either temporary or permanent. Temporary bowing is usually solved with the cooling down of the turbine, so that it does not need further actions.
A case study presented by Behrooz Ershaghi of Atlas Copco Mafi-Trench, Faisa Saez of British Petroleum and Marc LeDuc of Atlas Copco Mafi-Trench at the 41st Turbomachinery Symposium explained how magnetic bearings can be protected from external factors and process contaminations.
Whether one is talking about reactors or renewables, turbines or transmission systems, most of the attention goes onto making sure enough Megawatts (MWs) are generated to match the MWs being consumed at a given point in time. But in planning for future capacity, it is not just real power that matters, but complex power, that combination of real and reactive power that makes it possible to deliver the greatest quantity of real power over a transmission line to the end users.
(This is Part 2 of a two-part series. Click here for Part 1)
Wolverine Electric’s Burnips unit, according to GE records, was the first of 2 STAG units of 21 and 11 MW CC output that went operational in 1967. Both are still running.
The 11 MW unit operates for the City of Ottawa at 1600°F firing temperature and 895°F exhaust to produce 35.2 %. Station chief Randy Boyles provided the following information:
The first gas turbine ever introduced in Neuchatel Switzerland in 1939 had only 17% efficiency. Its simplicity was a challenge to the more complicated steam cycle to be later married into a combined cycle (CC) as both the Brayton and Rankine cycles improved. The earliest CC units achieved 32% efficiency in1961. 50 years later, they had reached 61%.
As the gas turbine industry continues to move towards increasingly advanced and efficient turbines, the costs of component maintenance and replacement continue to be a crucial factor for economic viability. Most strategic planning tends to be around the refurbishment and replacement of flow path components.
The use of natural gas as the fuel of choice for power generation suggests two possible driver technologies: gas turbines (GTs) and reciprocating gas engines (REs). Due to the range of output available, a 230 MW plant might consist of 13 to 25 RE units, or 1 x 230 MW GTs through to 16 x 15 MW GT units.
The U.S. Environmental Protection Agency estimated that industrial sources (agricultural, waste, and energy) emitted 323.5 million metric tons of methane into the atmosphere in 2005 alone. Methane is both a powerful greenhouse gas and a highly energy dense gas present in waste gases. Releasing large quantities of methane into the atmosphere is not only detrimental to the environment, but also a wasteful solution for an energy dense fuel. For this reason, governments are increasingly regulating methane emissions.
While gas-fired generation is up around the world, regional variations in the nature and extent of gas use are substantial. Siemens Energy's Living Energy magazine analyzes gas use in four regions to describe these variations.
NRG's Huntley coal-fired power plant in Tonawanda, New York, just outside of Buffalo, is experiencing average annual pre-tax earnings of a negative $1 million and "does not appear to be financially viable," according to a new Institute for Energy Economics and Financial Analysis (IEEFA) report requested by the Clean Air
The Grand River Dam Authority’s (GRDA) Board of Directors gave their unanimous approval for the selection of MPSA to supply a natural gas powered M501J Gas Turbine, SRT-50 Steam Turbine and associated electric Generators for installation at the proposed new Unit #3 at their existing power generation facility in Cho
Natural gas and oil production has gone way up the past few years here in the United States. A few years ago there were many skeptics who thought that the newly produced shale franking gas and oil production was only a bubble to soon pop, but now the experts all seem to agree that US gas and oil production is here to stay for the long run.
Most operators require that a gas turbine can operate over a reasonably wide range of fuels. Specifically, in pipeline and gas field duty, there is an expectation that a gas turbine can operate over a significant Wobbe Index range.
Due to a multitude of technical reasons such as weight, size and considerable shaking forces, emergency piston type diesel generators cannot be included in a watertight building or be placed at an elevation high enough to protect them from flood waters.
The future of the Texas electric market will very likely include substantial amounts of renewable energy and gas-fired power, economists with The Brattle Group find in a new report prepared for the Texas Clean Energy Coalition (TCEC).
"Exploring Natural Gas and Renewables in ERCOT, Part II: Future Generation Scenarios for Texas" provides a 20-year outlook for natural gas and renewable power in Texas. It is the first examination of its kind to be conducted and shared publicly in Texas.