Technologies

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Ebara Engineering Review No.244

Hydraulic Design and Performance Adjustment of a Reverse Running Pump Turbine Based on a Double Suction Pump

by Shusaku KAGAWA, Hiroyuki KANEKO, Takaki SAKURAI, & Hidenobu OKAMOTO

This report described as newly designed and developed a reverse running pump turbine that operates at a higher fixed rotational speed (2980 min-1) and higher head than conventional models. The newly developed reverse running pump turbine was designed using CFD based on conventional models; the performance of the final design was verified by a model test. The adjustment of the QH performance of reverse running pump turbine operating at fixed rotational speed, which had not been fully clarified, was also examined by CFD and a model test.

Keywords
Turbo machinery, Reverse running pump turbine, CFD (Computational Fluid Dynamics), Model test, Performance

Polishing Technique of Gallium Nitride Wafer Using Catalyst Surface Referred Etching

by Keita YAGI

A high-efficiency and high-performance planarization technique for gallium nitride wafers has been developed based on catalyst surface referred etching (CARE), a new polishing method utilizing catalytic surface reactions. A two-step polishing process consisting of STEP1 (increasing the removal rate by means of photo-electrochemical reactions) and STEP2 (achieving high-precision surface planarization by means of catalytic oxidation using noble metal) was proposed, demonstrating that the polishing of a lapped surface could be completed in 50 minutes. The polished surface was also found to be planarized at the atomic level and free of damage.

Keywords
Gallium nitride, Polishing, Catalyst, Photo-electro chemistry, Platinum, Quartz

PENTAM® Plastic Pump Series

by Hirofumi NAKAYAMA, & Shinobu ISHIZUKA

New products made of PENTAM® plastic have been developed. The new developments include self-priming pumps with high self-priming capacity, high-capacity/low-head mixed flow pumps, and nonreturn valves capable of reducing the pressure rise due to water hammer. Thanks to the corrosion resistance and wear resistance imparted by PENTAM® plastic, all of these products can be used in a wide range of applications.

Keywords
PENTAM® plastic, Self-priming pump, Mixed flow pump, HAMMER SOFT nonreturn valve, Water hammer, Corrosion resistance, Wear resistance, Impact resistance, Seawater intake, Seawater pump unit

Pump Equipment Construction Work for Shinkawa-ugan Drainage Pump Station

by Munetoshi FUJII, Takashi FUKUMOTO, & Sakae SHIMIZU

The Shinkawa-ugan Drainage Pump Station, located in the downstream area of the Shinkawa River, is a pump station with a long history, commencing operation in 1953. Because of its deterioration, the new pump station was constructed next to it, and with the replacement of all pump equipment, operation began in 2012. With this historic overall renovation, numerous innovations have been adopted with a focus on improving the maintainability of the equipment, based on Ebara’s technologies for pump-related equipment, which includes reducing running costs by improving the efficiency of pumps and motors, improving corrosion resistance, and retaining the ease of use from the old pump station. Also, continuous drainage was being performed by the remote monitoring operation in the pump station and although transferring the operation from the old station to the new was a challenge, the relocation was completed in a short period of time without hindering the operation as a result of the thorough field investigation and meticulous work.

Keywords
Drainage pump station, Renewal work, Horizontal-shaft mixed-flow pump, Vertical-shaft axial-flow pump, Pump efficiency, Motor power factor, Corrosion resistance, Erosion, Maintenance, Changeover

Improvement Work for Existing Fluidized-Bed MSW Incineration Plants
– Examples of Such Plants with Water Spraying Exhaust Gas Cooling Systems –

by Ryuichi ISHIKAWA, Takaharu NARITA, Sumihiro YOSHIKAWA, & Shigeru YAMAGUCHI

Improvement work, which aims to prolong the life of the facilities while improving their functions, is being carried out at existing MSW incineration plants. The improvement of functions is for reducing CO2 emissions as a measure to prevent global warming. For this purpose, there are improvements with heat use and the reduction of energy consumption at the plants. The fluidized-bed incinerator is equipped with features to slash power consumption, based on the results of the fluidized-bed gasification and ash melting system. It is now being reported that the improvement work was carried out at the fluidized-bed incineration plants with a water spraying exhaust gas cooling system, with which the improvement of heat use is difficult, and achieved a 20~30% reduction in plant power consumption.

Keywords
Fluidized-bed, Incinerator, Improvement, Life extension, Green-house effect, CO2 emission, Municipal Solid Waste (MSW)