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2007 Vol.40 No.2

IHI ENGINEERING REVIEW

2007 Vol.40 No.2

1. Development of Electric Propulsion Chemical Tanker with Contra-Rotating Propeller (CRP)

FURUTA Tetsuya, WATANABE Manabu
NAKAI Genta, MIYABE Hiroaki

An electric propulsion chemical tanker equipped with Contra-Rotating Propeller (CRP) was developed by IHI Marine United Inc. (IHIMU). An electric propulsion system, generally composed of diesel generators and electric motors, is apt to be less economical due to the energy loss, which arises in the electric components. To solve this problem, IHIMU adopted CRP and high efficiency hull form, both of which IHIMU has long-term experience of designing for larger vessels. As a consequence, about 5% fuel saving is expected. In spite of being a double hull tanker, this ship has as large cargo capacity as a conventional propulsion single hull tanker, thanks to smaller machinery space and reduced pump room.

2. Development of 8 700 TEU Type Mega Container Carrier

SAKAGUCHI Katsunori, TOYODA Masanobu
INUKAI Yasuhiko

Because of strong growth in the global container trade, container vessels engaged in main service routes such as Europe-Far East and Northern America-Far East have been getting larger with increased container stowage capacity every year. IHIMU (IHI Marine United Inc.) has developed the Mega Container Carrier with a container stowage capacity of 8 700 TEU (Twenty-feet Equivalent Unit). The vessel was designed to maximize container stowage capacity and propulsive performance. Advanced technologies achieved by IHIMU related to hydrodynamics and hull structural design have been reflected in the design of the vessel. This paper presents the outline of the vessel and such technologies for container vessels.

3. Energy Saving Device for Ship - IHIMU Semicircular Duct-

INUKAI Yasuhiko, ITABASHI Masahiro
SUDO Yasuhiro, TAKEDA Takeshi, OCHI Fumitoshi

To meet the increasing energy saving demand due to the rapid rise in fuel oil costs, a semicircular duct type energy saving device was developed. Compared with the present energy saving devices of the circular duct type, the lower part of the duct was removed to maximize its performance when located in the complex flow field around the stern, considering the hydrodynamic factors which govern the energy saving effect. A number of model tests were carried out and the results indicated that the energy saving for IHIMU semicircular duct was around 5%. This paper describes the principle and procedure for the development of the new type semicircular duct.

4. Present Conditions and Future Trends for AMP

SHIGEMATSU Junichirou
SUDOU Seiji, SHI Atsunori

The Port of Los Angeles (POLA) is proceeding to apply the AMP (Alternative Maritime Power) system which feeds electric power from shore to ship, in order to prevent air pollution due to the exhaust gas from generator engines during container vessel loading and unloading. IHIMU has relevant experience all over the world. An AMP system meeting the full requirement of POLA was installed on the NYK ATLAS for NYK (6 200 TEU Container vessel) delivered in July 2004. The demand for AMP systems is increasing at overseas and domestic ports, and competitors are also developing this system. Therefore, the summary of present conditions and future trends AMP are introduced.

5. Seismic Analysis of an SPB Tank Installed in the Offshore GBS LNG Terminal

MANABE Hideo, SAKURAI Tomoki

A preliminary design of LNG tank for the offshore GBS (Gravity Based Structure) LNG terminal has been conducted using the unique IHI-SPB (Self-supporting Prismatic shape IMO type B) technology. The SPB tank system achieves the robust and high reliable design, and has been applied not only to LNG carriers but also to the world's first. LPG FPSO. Moreover the SPB tank system should be one of the most suitable tank system for GBS. The tank is independent from the concrete GBS and insensitive to dynamic behavior of GBS due to tsunami or other environmental loads and accidents on the GBS. The SPB tank system can also resist the sloshing loads of LNG caused by earthquakes. This paper presents the seismic response analysis of the tank and study on seismic isolation system.

6. Operation Results of IHI Flue Gas Desulfurization System– Phase 1 Units Nos. 1 & 2 (300 MW each) of Waigaoqiao Thermal Power Station for Shanghai Electric Power –

TSUMITA Yoshimitsu, TODA Koji
ENDO Takumi, FUJINO Yoshihisa

IHI Flue Gas Desulfurization (FGD) System was completed in July 2006 for the two 300 MW coal-fired thermal power plants at Waigaoqiao, one of the largest-capacity power plants in Shanghai. This FGD system is the first to be constructed in Shanghai and is now operating smoothly and achieving superior SO2 removal efficiency. This system applied the latest design and new technologies to cope with the stringent local environmental regulations as follows.
(1) Spiral spray nozzle
(2) Dry type limestone milling system
(3) Pneumatic transportation system of limestone powder
These technologies can reduce the installation and running cost compared with a conventional type FGD system.

7. Mold Filling Simulation for Predicting Gas Porosity

KIMATSUKA Akihiko, KUROKI Yasunori

The process of mold filling requires consideration of the gas escape through the mold, gas vents and gas generation on the mold surface during mold filling. The pressure in the cavity increases due to compression of the gas by the melt, affecting the mold filling behavior. Further, the melt entraps gas or air in the die cavity. This paper presents a method to simulate mold filling while considering the backpressure and gas escape. The governing discrete equations for the momentum and mass conservation laws were derived by the DFDM (Direct-Finite-Difference-Method). Simulated mold filling patterns agreed rather well with the results directly observed by X-ray apparatus.

8. Study on Flow Fields in Variable Area Nozzles for Radial Turbines

TAMAKI Hideaki, UNNO Masaru
IWAKAMI Akira, ISHII Shinnosuke

The flow behind the variable area nozzle for radial turbines was measured with a 3-hole yaw probe and calculated with CFD. Two nozzle throat-areas were investigated, the smallest and the largest openings for the variable nozzle. Test results agreed with the calculated results qualitatively. The leakage flow through the tip clearance of the nozzle vane significantly affected the flow field downstream of the nozzle vane with the smallest opening. However, the effect on leakage flow on the flow field downstream of the nozzle vane was very weak with the largest opening, so significantly different flow fields were observed.

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