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Senoo S.,Energy and Environment Research Center | Kurosawa A.,Materials Research Center
Hitachi Review | Year: 2013

OVERVIEW: Hitachi has developed 3,600 r/min 50-inch blades and 3,000 r/min 60-inch blades as last-stage buckets for steam turbines with some of the largest annulus areas in the world. Adopting these blades for use in a 1,000-MW class steam turbine provides benefits that include improving turbine efficiency in relative terms by approximately 2.5% over that of steam turbines using 40/48-inch last-stage buckets, and increasing reheat steam temperature from 600°C to 620°C. In response to the problem of supersonic inflow at the tips of the buckets, supersonic turbine blades were developed to reduce loss, and the fluid performance of these blades was verified through cascade tunnel testing. In addition, a titanium alloy with a high specific strength was used to keep the centrifugal stresses in both blade and rotor within allowable limits. The 50-inch blades that were developed will be used in the 1,050-MW ultra-supercritical pressure steam turbines in units No. 9 and No. 10 at Korea Western Power Co., Ltd.'s Tae-An Thermal power plant.

Sakamoto K.,FH Wind Turbine Business Group | Matsunobu T.,Power Systems Company | Sato K.,New Energy Systems Engineering Section | Kondo S.,Energy and Environment Research Center
Hitachi Review | Year: 2011

Demand for renewable energy is growing as a way to help improve the global environment. Significant numbers of large wind turbine systems are being installed, mainly in Europe, the USA, and China, and this trend is expected to continue. A large 2-MW downwind turbine system jointly developed by Hitachi and Fuji Heavy Industries Ltd. commenced operation at two sites in Japan during 2010 and 2011. Since the generator controller employs technology for minimizing output fluctuations, a feature of the wind turbine system is that it contributes to grid stabilization even as use of wind power generation rises as a proportion of total grid capacity. Hitachi supplies total solutions regarding to not only generation systems themselves but also total grid systems for next-generation power systems able to cope with increasing use of renewable energy.

Horitsugi M.,Power Systems Sales Management Division | Hatamiya S.,Energy and Environment Research Center
Hitachi Review | Year: 2011

OVERVIEW: Hitachi's H-25 gas turbine is widely used in a variety of different countries for electricity generation and cogeneration. With the aim of expanding its scope of application further, Hitachi has been studying its use for "trigeneration", which involves the production of electric power, heat, and water. In addition to its features of reliability and suitability for continuous operation, this takes advantage of the H-25's ability to burn a number of different types of fuel. The supply of water, whether it be for domestic or industrial use, is an important part of the infrastructure of society. It is also a major issue for energy resource developments, including oil and gas production. In addition to their use for CSG production and to augmentextraction of heavy oil, trigeneration systems powered by gas turbines also represent a new type of system that takes account of environmental protection.

Nagasaki N.,OCG Project Management Division | Sasaki K.,Hitachi Ltd. | Suzuki T.,Babcock Hitachi K. K. | Dodo S.,OCG Project Management Division | Nagaremori F.,Energy and Environment Research Center
Hitachi Review | Year: 2013

OVERVIEW: Hitachi is participating in the EAGLE project being undertaken jointly by the New Energy and Industrial Technology Development Organization (NEDO) and the Electric Power Development Co., Ltd. (J-POWER) and has been contracted by J-POWER to supply a complete set of equipment and provide support for trial operation. Drawing on the results from EAGLE, Hitachi is also involved in the large-scale experimental testing of 170-MW-class oxygen-blown coal gasification combined cycle power generation technology being undertaken by Osaki CoolGen Corporation. In addition to the design, fabrication, installation, and commissioning of an oxygen-blown, two-stage spiral-flow gasifier (capable of gasifiering around 1,100 t/d of coal) and combined cycle generation plant, the company also has an engineering role in which it acts as technical leader and coordinates the overall demonstration plant. Hitachi is also working to expand applications for the gasifier to include chemical feedstocks, and its aim is to reduce the construction cost of commercial IGCC systems by minimizing the gasifier construction costs through standardization and improved know-how. In Hitachi's work on technical development aimed at achieving near-zero emissions (very low levels of CO2 and soot emissions), its approach is to seek to minimize loss of net thermal efficiency while also reducing construction costs.

Ladjevardi S.M.,Energy and Environment Research Center | Kashani A.H.,Energy and Environment Research Center | Izadkhast P.S.,Energy and Environment Research Center
Journal of Solar Energy Engineering, Transactions of the ASME | Year: 2013

In the current study, the performance analysis of a solar chimney power plant expected to provide off-grid electric power demand for villages located in Iranian central regions is presented. High annual average of solar radiation and available desert lands in the central parts of Iran are factors to encourage the full development of a solar chimney power plant for the thermal and electrical production of energy for various uses. The interested is in Kerman where solar radiation is much better than other areas of Iran. The obtained results clear that solar chimney power plants having 244 m diameter can produce from 25.3 to 43.2 MW h of electricity power on a site like Kerman during different months of a year, according to an estimation calculated from the monthly average of sunning. This power production is sufficient for the needs of the isolated areas and can even used to feed the main electrical grid. © 2012 American Society of Mechanical Engineers.

Funabashi S.,Energy and Environment Research Center | Iwase T.,Mechanical Engineering Research Center | Hiradate K.,Mechanical Engineering Research Center | Fukaya M.,Mechanical Engineering Research Center
Hitachi Review | Year: 2012

OVERVIEW: Pumps, fans, and other fluid devices are used in a wide range of system products, from power plants and industrial machinery to home appliances. Although CFD has been used in the design of these devices for some time, growing demands to reduce the load on the environment, to improve reliability and other aspects of product performance, and to cut costs are driving the need for analyses that cover a broad scope and achieve a high level of accuracy. On its own and through collaborations between industry and academia, Hitachi is responding to this need by working on large-scale analyses using fluid dynamics to study phenomena that could not previously be tackled. Hitachi is also applying techniques such as multi-objective design optimization in situations where trade-offs exist between different objectives, and special cavitation analysis techniques. © Hitachi, Ltd. 1994, 2012.

Kobayashi H.,Energy and Environment Research Center | Fukuda Y.,Kure Research Laboratory | Anzai H.,Hitachi Ltd. | Moriya K.,Hitachi - GE Nuclear Energy | Ikeguchi T.,Power Systems Company
Hitachi Review | Year: 2011

Hitachi undertakes full-scale demonstration trials from specific research projects and utilizes the latest simulation techniques to identify and understand physical phenomena. The company is also working toward the adoption of distributed power sources and renewable energy and the development of control systems and systems for connecting these over wide areas in addition to equipment for large generation, transmission, and distribution systems. It is working independently and with partners to extend its research and development globally, including in the field of manufacturing, taking active measures that are intended to build mutual trust through technology development. It is also undertaking research and joint development with universities, research institutes, manufacturers, and other organizations in Japan and other countries to achieve these objectives.

Jassim A.N.,General Commission for Industrial Research and Development | Ali D.F.,Energy and Environment Research Center | Shamoon I.H.,Energy and Environment Research Center | Abood W.M.,Energy and Environment Research Center | And 2 more authors.
Advances in Environmental Biology | Year: 2012

The present study is focused on removal of Pb(Π) from aqueous solutions using thermally activated zeolite 5A as adsorbent. Factors that effect the lead removal include the optimum dosage, pH, and temperature. The maximum removal of lead was observed at pH = 7. Removal of Pb (Π) increased from 82 % to 98.8% with increasing adsorbent dosage from 0.5g to3g, the adsorption process was found to obey Langmuir adsorption isotherm and Freundlich adsorption isotherm. From all that we can conclude that zeolite 5A is of practical importance and expected to be economical.

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