Technologies

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Ebara Engineering Review No.235

Blade Optimum Design by using Three Dimensional Inverse Method and CFD

by Hiroyoshi WATANABE, & Yumiko SEKINO

This paper introduces the optimum design process by using the three-dimensional inverse method, CFD (Computational Fluid Dynamics), and multi-objective design optimization method such as multi-objective genetic algorithm, and its applications.
Two applications of the optimum design process for different pump types and purposes of optimization are described. These examples show a wide applicability of the optimization method that uses the blade loading distribution (the hydrodynamic parameter) as a design parameters. The optimum blade loading distribution parameter obtained by this optimization process can be correlated with the performance improvement mechanism for easy understanding, which is advantageous in inheritance of skills. Continuously updating the optimum design database obtained through the optimum design process enables pumps to be quickly customized to meet customer needs.

Keywords
Optimum design, CFD, Three dimensional inverse method, Multi objective design optimization, Response surface, Mixed flow pump, Performance, Inducer, Cavitation, Instability

Thermal Purging and Adsorption System for Centrifugal Refrigerating Machines

by Hideaki YAGISHITA

The Guidline for Prevention of Refrigerant Leakage from Refrigerating and Air-conditioning Equipment and Systems (JRA GL-14:2010) was established in Japan on September the 28, 2010. This guideline, made referring to the EU F-gas Regulation, is designed to reduce direct impact on the environment by high-efficiency refrigerating equipment and machines, as well as to reduce the same by refrigerant leakage. The following introduces newly developed low-pressure refrigerant products for centrifugal refrigerating machines. These refrigerants are made reusable by an adsorption process using activated carbon, enabling a reduction in the “visible” leakage amount of the refrigerant to be 1/100 of that of conventional Ebara refrigerant products.

Keywords
Adsorption, Refrigerant, Centrifugal refrigerating machine, Purge, Leakage, Recovery, Activated carbon

Model 3TP 3-inch High Speed Submersible Pump for Deep Wells

by Hiromi SAKACHO, Ugo TURETTA, & Andrea FONGARO

A high speed submersible pump (Model 3TP) for deep wells, equipped with an inverter-driven high speed motor, has been developed. The pump, motor and inverter are assembled in one structure. Its inverter-driven high speed motor achieves a high pump rotation speed, thus allowing less stages and a smaller diameter. The performance of a 4-inch pump is realized in this 3-inch pump. As for 4-inch wells, whose number exceeds 70% of all wells, vinyl chloride pipes are generally used as their casings. Decrepit casings of 4-inch wells tend to be bent and deformed due to subsidence or earthquakes. There are even cases where it is impossible to install new pumps because of this. The Model 3TP fulfills the demand in pump replacement for 4-inch wells.

Keywords
3-inch high speed submersible pump for deep wells, Inverter driven high speed motor, Submersible induction motor with oil filled, Plastic part, High-speed rotation, Overload protection, Dry running protection, Voltage change protection, Arrester protection, Overheating protection

EDFrame Monitoring and Control System

by Yoshihiro AIKAWA, & Tomio MAKINO

EDFrame is a newly developed monitoring and control system which makes use of leading-edge Open ICT technology. By this system data acquisition devices (M2M), installed at various locations in pumping stations and waterworks facilities, as well as at various measurement points, are linked up via broadband, public telephone lines and PHS. This system also features a tool which enables an automatic creation of software and test reports in accordance with the design data of the system. It thus realizes a product which enables a seamless linkage among design, production and testing stages. The EDFrame system is versatile, safe and capable of being extended.

Keywords
Monitoring, Remote control, Simulator, Machine to machine, Virtualization, Cloud, Waterworks, Wastewater treatment, Extendibility, Diversity

Report on Delivery and Operation Condition of Large-scale Grate-type Incinerator in Weihai City, Shandong, China

by Kazushige KUROSAWA, Daisuke SAKU, Yoji SATO, Tian Shu Ying, & Wang Zheng Bing

Ebara’s first two grate-type furnaces with a waste disposal capacity of 700 t/day (350 t/24 h×2) were delivered to the Weihai Waste-to-Energy Co., Ltd. in Shandong, China, and their performance test was completed in October 2011. The design of the furnace and system considering the low calorific value of garbage in China has achieved the similar combustion performance as in furnaces in Japan, enabling a stable operation. This paper describes the redesigned points for China, results of the performance test, and operational status to date.

Keywords
China, Waste, Incinerator, Stoker, Calorie, Combustion, Environmental, HPCC, Tsingtao

The Reduction of Maintenance Cost for Fluidized-bed Gasification and Slagging Combustion System & the Trial for Long Continuous Operation

by Hironubu YAMAGUCHI, & Tomoaki OHARA

The facility referred to in this paper is Ebara’s forth fluidized-bed gasification and slagging combustion system designed for local governments in Japan and has been operating for nine years since March 2003. Under the low municipal budget due to the protracted economic downturn, facilities of this kind are required to be stably operated and maintained at low costs. To fulfill these requirements, we achieved the cost reduction and long-term stable operation through the site review of this facility.

Keywords
Long term stable operation, Cost reduction, Fixed-quantity supply, Low air ratio combustion, Combustion chamber temperature, Quantity of steam generation, Electric energy, Award