If inlet conditions in a low-pressure centrifugal compressor change, there is a reduction in operating efficiency but no surge problem. However, in a high-pressure compressor, variations in inlet condition can introduce an error of more than 30 percent (greater than the usual safety margin of 10 percent).
Interest in low-grade heat recovery has grown in recent years. A number of approaches have been proposed to capture and convert low-grade heat energy, traditionally viewed as not commercially useful, into productive electric power. Among the proposed solutions is the use of ORC technology.
In the past few years, it has become commonplace to install centrifugal compressors in parallel with reciprocating compressors. Among other concerns related to this system layout, centrifugal compressors cannot efficiently operate with high-amplitude pressure fluctuations (pulsations) in the attached piping system.
Onshore sighting of LNG production facilities in places like Australia and Malaysia can often require long and expensive pipelines to bring the fuel to the refrigeration equipment. This has triggered renewed interest in offshore LNG production.
Combined cycle gas turbine power plants are currently the most efficient way to convert fossil fuels into electricity. For several years, the Holy Grail of power generation was to reach, and exceed 60 percent thermal efficiency at the generator terminals. The path to this accomplishment involved significantly improved gas turbine efficiency, higher combustor firing temperatures, state-of-the-art steam cycles and modern hydrogen-cooled generators.
Dubai Aluminium (DUBAL) recently claimed that it has leveraged a nominal volume of the steam produced by the captive cogeneration and combined cycle DUBAL power station to drive the UAE's first absorption chiller using waste heat.
In addition to component design, steam turbine reliability is dependent on many systems that can affect its safety, and therefore calls for effective monitoring of steam, condensing, governor, protection, trip valve exerciser, steam seal, cooling and monitoring systems. Defining the steam conditions accurately ensures maximum power output and reliability. Failure to do so has often led to low turbine power output and erosion of the last stages of blading in condensing turbines.
The 100-MW solar thermal power plant Shams 1 was officially launched in Abu Dhabi recently. The heart of the plant, a steam turbine supplied by MAN Diesel & Turbo, will be used to drive a generator. The eco-friendly electricity produced by this would be enough to serve roughly 57,000 German households.
Wood Group has secured 11 new contracts in Africa totaling approximately $240 million, which were awarded over the last 12 months. The contracts were awarded to Wood Group PSN, Wood Group GTS and Wood Group Mustang for projects in five African nations.
Wood Group PSN, which provides brownfield production services, won contracts to provide operations & maintenance and construction services to clients in Equatorial Guinea, Chad and Algeria.
The misalignment of turbomachine train rotors is the second most common malfunction of turbomachineries (the first most common malfunction is unbalance). Turbomachine alignment procedures have been involving quite sophisticated laser-optic instrumentations. Nowadays, laser-optic methods are considered routine. Literature on ‘how to align a turbomachine’ are popular. However, misalignment effects and condition monitoring methods have not drawn that much attention.
Unbalance is the most common malfunction in turbomachines. In an unbalanced condition, the machine’s rotor mass centerline does not coincide with the axis of rotation (condition of unequal mass distribution at each section of the rotating assembly). Unbalance represents the first, fundamental mechanism to transfer the rotational energy into the vibration.
Under the patronage of His Excellency Dr. Mohammed bin Saleh Al-Sada, Minister of Energy Industry and Chairman & Managing Director of Qatar Petroleum (QP), Said Mubarak Al-Mohannadi, Director of Operations QP, inaugurated on March 18, the 2nd Middle East Turbomachinery Symposium (METS 2), which will run until March 20 at the Qatar National Convention Center. Al-Mohannadi delivered the keynote address on behalf of H.E. Dr. Al-Sada and then led the ribbon cutting ceremony.
Abu Dhabi recently made a 10-fold boost in its capacity to generate electricity from the sun by officially launching the Shams 1 solar plant for business. The 100 MW solar collector plant is a cooperative venture between Masdar, Abu Dhabi’s state-owned renewable-energy company, French oil firm Total and Spain’s energy infrastructure company Abengoa Solar.
Proper anti-friction bearing selection, careful evaluation of low loaded bearings and review of vendor bearing load experience can eliminate the possibility of bearing skidding. Complete gearbox damage has been caused by the use of high DN, low loaded anti-friction bearings in indeterminate bearing systems in multi-stage, high torque reduction gears.
ITM Power, the energy storage and clean fuel company, has won a competitive tender process, based on price and performance, for a Thüga Group project, to supply a 360kW Power-to-Gas energy storage plant. This is ITM Power’s first major commercial sale in Germany of a large hydrogen production unit based on its unique design of a self-pressurizing rapid response PEM Electrolyzer.
The Western Turbine Users Inc. (WTUI) conference is taking place this week in San Diego, California. Its audience is made up of hundreds of users of GE LM2500, LM5000, LM6000 and LMS100 aeroderivative gas turbines. The LMS100 has accumulated 173,870 operating hours with a high time unit in Argentina at 20,037 hours which runs in base load most of the time. The total LMS100 starts worldwide starts at 24,313, with 28 units in commercial operation at the end of 2012.
The LUKOIL-West Siberia's Povkhovskaya GTES-48 gas turbine electric power plant was put into full production run last month. The 48-MW electric power plant operates on oil-associated gas in the cogeneration cycle.
The Povkhovskaya GTES-48 is now the fifth facility of LUKOIL-West Siberia's on-site power generation developed by Aviadvigatel specialists. The electric power plant consists of four 12 MW power generating units based on the GTU-12PG-2 gas turbine unit.
GE Marine has recently delivered one LM2500+G4 aeroderivative marine gas turbine to Avio SpA of Turin, Italy, a GE Marine System Supplier. The gas turbine will power the French Navy's eighth FREMM frigate Lorraine.
Hitachi recently announced the achievement of rated output at the 40MW-class test facility with the new gas turbine, AHAT (Advanced Humid Air Turbine) system, being co-developed with the Central Research Institute of Electric Power Industry (CRIEPI) and Sumitomo Precision Products Co., Ltd. (SPP).
Once considered an occasional “necessary evil,” fuel gas booster (FGB) compressors in turbine power generation facilities have become a common requirement. FGBs are installed because of insufficient gas pressure onsite or from nearby utility gas pipelines.
Historically, pressures up to 300 psig (~20 barA) were adequate for most industrial gas turbines and were often available onsite or at an economical distance. But modern gas turbines tend to run at much higher compression ratios, thus raising the inlet fuel gas pressure requirement.
Parallel shaft gears offer optimum reliability and lower MTTR and are preferred for ease of maintenance and minimum components. Parallel axes are the most common gear arrangement, consisting of a meshing pinion and gear. Parallel arrangements can be simple, or compounded with other parallel gear sets to obtain high gear ratios. The conventional way to describe such a gear is ‘double increaser’ or ‘reduction’ or triple increaser’ or ‘reduction gear’. Parallel axis gears can use spur, helical, double helical or herringbone elements.
The retrofit market for gas turbine (GT) and compressor control systems is poised for a major boom. Systems sold during the GT bubble of the nineties and early 2000s are ready for an upgrade, not to mention even older systems equipped with analog controls or electromechanical governors.
Clark Weaver, Manager of New Product Introduction, Wood Group GTS said, “The average life cycle of many OEM controls are in a 10- to-15-year time frame. Some sites are one failure away from being down indefinitely and are not even aware of it.”
Sensor Coating Systems (SCS) recently announced the launch of a ‘User Club’ for the development of its core sensing technology, a Thermal History Coating (THC). The club launches with five members, including Alstom (Switzerland) Ltd., MAN Diesel & Turbo (Germany), SNECMA (France) and SCS.