PDF Publication Title:
Text from PDF Page: 046
46 • High speed response of less than 60 ms required by aeroderivative gas turbines to prevent overspeed in block off-load conditions. • Explosion proof actuation to appropriate specification standards, allows operation in hazardous methane service. • Resistance to fuel contaminants including tar, shale, water, sand and so forth. • 24 volts DC is the maximum drive voltage which ensures personnel safety • Corrosion resistance in components exposed to wet fuel and corrosion resistance to all parts if the service is sour gas. Other operational objectives that dictate design features are operator’s requirements for: • Low mean time to repair (LMTR). The target of 1 hour, achieved with modular design, together with the target MTBF provided an availability of 99.998% for HSDE’s original stepper. • Higher Mean time between failures (MTBF). In HSDE’s case, a target of 50,000 hours was set and achieved. • Low maintenance costs, since the modular design can be repaired by an individual with relatively low expertise. Service intervals are 12 months. • Large control ratio which allows control over the ignition to full load as well as full speed ranges to be possible with one fuel valve. Fuel pressure variation compensation is provided. The additional speed ratio type control valve found in many other industrial gas fuelled installations is not required here. • Low power consumption since an electric motor of less than 100 watts is used. This also eliminates the need for additional hydraulic or pneumatic systems. Also black starting is more reliable if the fuel system is powered by the same batteries as the controller. PCS applications experience with fast response valves: Power production in Phase II of the Petroleum Corporation of Singapore or PCS, was commissioned in June 1997. PCS is part of a massive petrochemical plastics conglomerate in Singapore. Power production was an afterthought, as when they were built, their design did not include provision for them becoming an SPP. PCS chose a nominally 25 MW (23 MW in their normal ambient conditions) ABB GT10, although their power needs are roughly 26MW. This was because while SP were pleased to sell them their residual requirement; they would not buy any power from SPPs at the time of original power plant design. The turbine is fuelled by three different types of fuel, depending on the state of the plant. The BTU for each type varies, so again the fast response time for the stepper valve is critical. As PCS operations found, their fast response valve proved as useful as the stepper valve has been for power generation on the North Sea oil and gas platforms. The fast response time of the Moog (and other stepper valve manufacturers’) design helps the valve avoid the sudden burst of excess temperatures that accompany higher heating value fuel. (North Sea platform users frequently operate gas, liquid or gas & liquid fuel mixtures). Not all gas turbines are tolerant of a wide range of fuel types in a single application. Some of them require a whole different fuel system - nozzles, lines and all components - to be able to handle a totally different heating value fuel. In this application in Singapore, the ABB machine shows no sign of distress, which is interesting since the heating value of the fuel types varies as much as 50 percent. The exact fuel composition data is proprietary to PCS. PCS’s GT10 heat recovery steam generator (HRSG) provides a reliable source of steam. The plant exports steam to the nearby Seraya Chemicals plant in addition to fulfilling their needs. Emissions and steam supply: The original ABB EV burner design - a low NOx burner which can be fitted and retrofitted on the GT10, fuel types permitting - was not fitted in this case. The EV burner will handle clean natural gas and clean diesel fuel. It was not suitable for the high hydrogen content and variations in fuel composition that this application involves. Such fuels need a more forgiving fuel system, as well as water or steam injection to keep the NOx down. The PCS Singapore application uses steam for NOx reduction purposes. The steam is piped in through nozzles that are adjacent to the fuel nozzles on the fuel manifold of the GT10’s annular combustor. The source of the steam is the heat recovery steam generator (HRSG) that is packaged as part of the GT-10 system. If and when required, the plant also can draw high pressure steam from their process cracker. In PCS’ case, one boiler has been found to suffice. This is noteworthy as in applications like this, a redundant “packaged boiler” (running hot and on minimum load) is often found essential. This is so that it is possible to pick up the steam load should the turbine trip or be unavailable due to maintenance. A common subject for debate is whether uninterrupted steam supply during the switch from HRSG mode to fresh air firing is possible without flame out on the boiler supplementary burners.PDF Image | GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS
PDF Search Title:
GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONSOriginal File Name Searched:
gas-turbine-combined-cycle.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)