Technologies

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Ebara Engineering Review No.236

Trends in Energy Saving for Pumps and Motors

by Tatsuya MIYAMOTO

For prevention of global warming, many countries have started setting energy-saving regulations for pumps and motors.
The ErP Directive (Ecodesign requirements for energy-related products/EU) and the GB Standards (China) derive their minimum efficiency requirements for pumps from flow rate and specific speed, while standards such as IEC and NEMA define the efficiency of motors based on outputs. All of these standards are intended to contribute to energy saving by eliminating low-efficiency products from markets which will lead to overall improvement in product quality in the future.

Keywords
Pump, Motor, Energy saving, Efficiency regulation, ErP Directive, GB Standard, International Electrotechnical Commissions, National Electrical Manufactures Association, Specific speed, Flow rate

Furnace Capacity Expansion Project at Chubu Recycle Co., Ltd.

by Akira SHIMOKURA, Ikuhisa YOKOTA, Takahiro ONO, Tadao ISHIDA, Tsugumitsu MATSUTOMI, & Kazuaki HIROTA

The furnace capacity has been expanded from 45.6 t/d to 67.2 t/d by upgrading the electric furnace transformer from 2000 kVA to 3050 kVA. Spanning about three years from planning to completion, the project has increased the annual throughput of the municipal waste incineration ash melting and recycling process to about 34000 tons. The submerged arc furnace melts raw material based on electric resistance heating by applying electric current directly to the material via electrodes. It supports the reduction melting of waste incineration ash with the addition of coke, facilitating the recovery of reducing slag (main product obtained by slowly cooling molten slag) and valuable materials, such as molten copper and other metals and crude zinc (urban mine). The furnace also contributes to environmental preservation. Thus, the completion of the project establishes one milestone toward the goal of the installation of the second furnace.

Keywords
Electric furnace transformer, Submerged arc furnace, Recycle, Resource, Urban mine, Reduction melting, Minor metal, Environmental assessment for capacity expansion

Continuous Operation of a Fluidized-Bed Gasification and Ash Melting Plant for 226 Days

by Kazuaki WATANABE, & Katsutoshi NARUSE

“Ecotopia Ikehara” is a fluidized-bed gasification and ash melting plant with a capacity of 309 t/d (103 t/d x 3 lines) run by the Kurahama Sanitary Facilities Association in Okinawa. Continuous operation using the third line of the plant was accomplished for 226 days from June 2011 to February 2012. The results of the continuous operation have shown that the CO concentration in stack exhaust gas can be kept to 10 ppm or less during low air ratio operation and that the voluntary criterion for dioxin concentration in ash (0.25 ng-TEQ/g or less) is met without heating dechlorination equipment. Thus, it has been demonstrated that the plant can provide reliable incineration for a long continuous period. With a combustion air ratio of nearly 1.0 in the area up to the slag hole of the ash melting furnace, the transfer factor of lead to slag is less than 1%, which is quite a low value for ash melting furnaces operating in oxidizing atmospheres. In addition, slag quality during continuous operation meets JIS requirements.

Keywords
Fluidized-bed, Gasification, Continuous operation, Transfer factor of lead to slag, Dioxins, Combustion stability, Low air ratio, Ash melting, Fuel consumption, Power generation

New Dry Vacuum Pump, Model EV-M

by Masami NAGAYAMA, & Tetsuro SUGIURA

Dry vacuum pumps are used to achieve a clean vacuum environment for manufacturing electronic components including semiconductors. However, inlet gases generated during the manufacturing processes often cause deposition of reaction by-products and corrosion inside the pumps; the pumps operate under harsh conditions.
The Model EV-M pumps have incorporated various countermeasures against deposition of reaction by-products and corrosion, including optimization of internal temperature, in addition to significant improvements in energy saving performance. These have enabled both excellent endurance and energy saving performance under harsh conditions such as the deposition and etching processes.

Keywords
Dry vacuum pump, Semiconductor, Exhaust gas, Reaction by-products, Corrosion, Internal temperature, Energy saving, Deposition, Etching, Endurance

Compact Type Plating System, Model UFP-AD

by Yoshio MINAMI, Yoshitaka MUKAIYAMA, & Tomonori HIRAO

Model UFP-AD has been developed as a downsized version of Model UFP, our automatic plating system for packaging.
This model is reasonably priced for finalizing plating conditions in trial production or for small-scale production. It has plating cells arranged in a single row and uses a newly designed, thus simplified, mechanism for loading/unloading and transporting wafers. Only one type of frame is used for the plating chamber so that various types of plating can be handled by changing the arrangement of plating bathes based on the concept of the skeleton-infill system. In addition, a wagon-type stocker is equipped, which enables removal of wafer holders for maintenance even during operation. Such a structure maximizes production volume in spite of its small size.

Keywords
Packaging, Plating, Wafer, Small-scale production, Throughput, Plating bath configuration, Wagon-type stocker, Transporter, Wafer holder, Anode holder

Operation of the HPCC21 Stoker System at Kawasaki City Ozenji Municipal Solid Waste Treatment Center

by Teruaki TSUKAMOTO, Masamitsu SASE, & Minoru SASAKI

Treatment plants for municipal solid waste have recently been required to deal with a wide range of issues, such as hygienic treatment, reduction of the burden on the environment, waste volume reduction, material recycling and efficient energy use. In particular, their role as a power generation source has become important. In this background, the construction of the Ozenji Municipal Solid Waste Treatment Center was completed on March 30, 2012. The Center is intended to serve as a key facility for the treatment of municipal solid waste in the northern area of Kawasaki City. This paper introduces and discusses the outline and the operation of the Center.
This plant uses Ebara Environmental Plant Co., Ltd.’s advanced stoker technology with the goal of achieving harmony with the surrounding environment based on three main concepts: low carbon emissions, resource recovery, and coexistence with nature. Featuring low air ratio operation based on exhaust gas recirculation and minimizing heat loss through the advanced process of dry exhaust gas treatment, the plant provides efficient power generation and reliable incineration.

Keywords
Solid waste management, Incinerator, Stoker furnace, High-efficiency power generation, Low air ratio combustion, Advanced dry gas treatment system, Exhaust gas recirculation, Forcible air-cooling type stoker