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Ebara Engineering Review No.205

Comparative Study on the Performance of Two Wind Turbine Generator Systems

by Satoshi SEKIZUKA, Sumio SAITO, & Arinobu SATO

A comparative study was made on the performance of two actual wind turbine generator systems, both being asynchronous but each with a different control system (different power output and speed control). It was found that fluctuations in the electric current matched power output fluctuations for both systems. As for wind speed fluctuations, differences were found depending on the type of control system. The following discusses this study in detail.

Wind turbine, Wind turbine generator system, Propeller type wind turbine, Power control, Constant speed wind turbine, Variable speed wind turbine, Wind speed, Induction generator, Power curve, Acoustic noise

Variable-speed Pump for Shallow Wells

by Chikara MAKINO, Takashi ISOBE, & Ryota MIKI

A variable-speed, shallow-well pump, equipped with an inverter-driven DC brushless motor, was developed. This pump features an estimated constant end-pressure control for maximum energy conservation and noise reduction (about a 55% saving in energy and 7 - 10 dB (A) in noise reduction, compared to the case of conventional such pumps). Compared to induction motor equipped conventional models, its new hydraulic parts enable the pump performance characteristics of this pump suitable for the control pressure and applied flow rate ranges. Safety in the water quality is further improved by compliance with the leachate performance standard. This pump can also easily replace existing conventional such pumps as its dimensions and suction-discharge diameters are made compatible with conventional types.

Variable speed, Inverter, End pressure, Noise reduction, Energy conservation, Constant speed, Compatibility, Fuzzy control, Excessive frequency of starting, Cascade pump

PFC-containing Waste Gas Treatment Systems

by Toyoji SHINOHARA, Akira TANAKA, & Tadakazu NISHIKAWA

Three types of PFC-containing waste gas treatment systems (combustion, catalyst and fluoride fixation types) have been developed and are now market-available. The fluoride fixation type produces no drainage. These systems are for use by semiconductor and liquid crystal manufacturing industries who use PFCs in etching and cleaning processes. The following outlines these systems.

Par-fluoro compounds, Global warming effect gas, Catalyst type waste gas treatment system, Fluoride fixation type waste gas treatment system, Decomposition by catalyst, Oxidization and decomposition by heating, Fluoride fixation absorber, Reactor, Heater, Toxic gas

Wafer Ambient Control Box

by Akira TANAKA, Yoko SUZUKI, & Tomonori OHASHI

A 200 mm wafer ambient control box, which corresponds to the SMIF system, has been developed. This ambient control box is a wafer storage-transporting container, capable of minimizing particle contamination, molecular contamination, as well as humidity. The following outlines some results of the development carried out under grant from the New Energy and Industrial Technology Development Organization (NEDO) of Japan, including data on a 300 mm wafer ambient control box.

Semiconductor, Wafer, Contamination control, SMIF system, Clean environment, HALCA project, Out gas, PWP test, Chemical filter, Airborne molecular contaminants

Development of a Compact Co-generation System with ADG using PEFC

by Masao MURAI, Kazuo KINOSHITA, & Keitaro TADA

A compact co-generation system, equipped with a PEFC (Polymer Electrolyte Fuel Cell) which uses ADG (Anaerobic Digestion Gas) as fuel, has been developed and tested. Test results were favorable, indicating that this system used at a sewage treatment plant would reduce energy consumption, effectively make use of ADG produced during sludge treatment, make available electric power as well as hot water, and cause less impact on the environment.

Polymer Electrolyte Fuel Cell (PEFC), Sewage plant, Digestion sludge, Self-sufficiency rate, Anaerobic Digestion Gas refining equipment (ADG refining equipment), EBARA BALLARD CORPORATION, Residential 1 kW PEFC co-generation system

Ventilation System for Seki Tunnel on Route 25

by Hiroshi UDAGAWA

EBARA's ventilation system for the Seki Tunnel on Route 25 has been modified to minimize life cycle cost. This was done by replacing the main parts of the system's jet fans with stainless steel material which feature better corrosion resistance.

Seki Tunnel, Jet fan, Corrosion, Stainless steel, Life cycle cost, Tunnel Ventilation

Tunnel Facilities Management and Control System


A tunnel facilities management and control system had been developed for the Toyama Office of the Ministry of Land, Infrastructure and Transport, Government of Japan. Mangement and control can now remotely done via the Web for tunnel ventilation, measurement, fire fighting, defrosting, water drainage, etc. Servers are installed in respective offices for totalized facility data access, including log books and equipment drawings.

Remote monitoring and control system, Facility data system, Tunnel ventilation, Emergency facilities, Web

Fluidized-bed Incineration System in Use at Takasago Paper Co., Ltd.

by Shinichiro CHIBA, Yasuhiro ANAZAWA, & Takeru MATSUBARA

A fluidized-bed incineration system , featuring treatment of paper sludge, incineration of reject from paper recycling, use of excess heat from incineration to generate steam for use within the factory, is being used at a paper mill of Takasago Paper Co., Ltd. This system is achieving a reduction in waste output from the mill, a saving in energy consumption and waste treatment cost, as well as minimized impact on the environment. The following outlines this system.

Fluidized-bed incinerator, Industrial waste, Paper factory, Paper sludge, Reject, Waste heat, Environmental impact

Rotary-kiln Firing System for an Industrial Waste Incineration Plant

by Takeshi UOZUMI, & Takeshi MIYATAKE

EBARA's rotary-kiln firing system (treatment capacity: 36.24 tons/24 hours×1 furnace) has been installed at the Nisio Plant of Aisin Seiki Co., Ltd. for treating industrial waste (sludge-including waste paint, waste oil and waste liquid) produced at this plant. Excellent feedback of the system's operation is reported and treatment results indicate that local environmental standards are being sufficiently met. In particular, dioxin emission is kept considerably below the 0.1 ng-TEQ/m3(NTP) local standard. Excess heat from the flue gas is effectively used to supplement combustion heat in the kiln.

Rotary-kiln, Industrial waste, Dioxins, DCS (Distributed Control System), Catalytic reaction tower

Photovoltaic Power Generation System for Subway Station - Developed for Kobe City Transportation Bureau -

by Masaru KOJIMA, Kenichi KUROKAWA, Hironori NINOMIYA, & Tetsuo UCHIDA

A new type photovoltaic power generation system has been developed for use at subway stations. This system features a compact, transformer-less power conditioner and computerized data analysis and retrieval. This system has been installed at Kobe's Sogoundo Koen Station. The following introduces and discusses this system.

Photovoltaic module, Photovoltaic array, Support structure PV module, Foundation for photovoltaic array, Transformer-less, Power conditioner, Data measurement system, Software of data measurement, Trend screen, Display panel of generating data