Technologies

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Ebara Engineering Review No.242

Development of Deep Well Submersible Canned Motors for the Global Market

by Osamu TATEISHI, & Kaname KURITA

This paper presents deep well submersible canned motors for the global market. The market for deep well submersible motor pumps is recently expanding with the increased use of well water due to population growth and economic development in emerging countries. Therefore, Ebara Corporation has developed deep well submersible canned motors ZBH4N, ZBH6N, and ZBH8N, which provide the high quality, reliability, and durability required by the global market, have high thrust load bearings, and meet NEMA standards. The company has launched the products in the global market.

Keywords
Submersible canned motor, High reliability, High durability, High thrust load bearing, Deep well, High depth, Starter, Single phase motor, Three phase motor, Clean water

Introduction of the Design Features of Cryogenic Pumps and Expanders for FSRU Applications
for EUV Mask Inspection

by Hideharu WATANABE

This paper describes the design enhancements of cryogenic pumps and expanders for the floating liquefied natural gas (LNG) vessels applications, such as floating storage regasification units (FSRU). The conceptual design of two-phase expander is also discussed for power recovery applications.

Keywords
LNG, Cryogenic pump, Expander, Power recovery system, Shaft stabilizer, Two-phase fluid

Compact Dry Vacuum Pump Model PDV50

by Yoshinori OJIMA, Naoya YOSHIDA, & Hiroyuki KAWASAKI

Scientific instrument, such as analytical equipments and electron microscopes, uses small-capacity vacuum pumps. The compact dry vacuum pump Model PDV50 has been developed for use in these applications. This pump is a positive displacement dry vacuum pump with two synchronously rotating motor rotors; the innovative advantage of the pump is that the use of a proprietary motor with a magnetic coupling eliminates the necessity of timing gears. Without timing gears, the pump features a simple structure and requires no lubricating oil, allowing fast rotor rotation. It is also compact and weighs only 10 kg. Since the pump module can be mounted in any orientation, the pump can be flexibly installed. In addition, the pump has an operating noise level of 53 dB(A) or less thanks to reduced machine noise and a noise suppression package.

Keywords
Dry vacuum pump, Twin shaft synchronous motor, Timing gear, Screw, Compact, Rotary vacuum pump, Scroll pump, Diaphragm pump, Analytical equipment, Electron microscope

Ash Melting Treatment in Fukushima City and Aftermath of the Great East Japan Earthquake

by Nobuya AZUMA

A next-generation stoker type incinerator system manufactured by Ebara Environmental Plant Co., Ltd. has been delivered to the Arakawa Clean Center in Fukushima City to simultaneously achieve high-efficiency power generation and ash melting treatment. The plant generates 440 kWh (FY2010) of electricity per ton of incinerated waste and has relatively high power generation performance among incineration plants with an incineration capacity on the order of 200 t/day. The plant also achieves a landfill rate of about 4% by melting both bottom ash and fly ash. The plant was damaged by the Great East Japan Earthquake (in March 2011). However, it was immediately restored by Ebara Environmental Plant Co., Ltd. and restarted its incineration operation eight days after the earthquake. Since the Great East Japan Earthquake, the plant has continued to reduce the volume of bottom ash through ash melting treatment, contributing to extending the life of final landfill sites, which was expected to run out after the earthquake.

Keywords
Incinerator, Stoker furnace, High-efficiency power generation, Low air ratio combustion, Flue gas recirculation, Plasma type ash melting furnace, Slag, Great East Japan Earthquake, Radioactive substance, Final landfill site