Other

Kabushiki Kaisha Toshiba

Shoji Nakashima

Shuichi Inagaki

Shigeru Sakurada

Koichi Yoshimura

Hideki Sekiguchi

Shunji Kawano

Kenji Sato

Tadahiko Oba

Takahiro Kajiyama

Hidetoshi Usui

Tadahiko Ooba

A titanium sheet ( ) serving as an anode-forming member is fixed on a tube plate ( ) of a heat exchanger ( ) via a insulting sheet ( ) and an insulating adhesive ( ). The sheet ( ) is coated with a film ( ) of an electrochemically active, stable electrical catalyst. A dc power unit ( ) has a positive electrode ( ) electrically connected to the sheet ( ), and a negative electrode ( ) electrically connected to the tubes ( ). The inner surfaces of the tubes ( ) are used as a cathode for electrolysis for oxygen generation. An automatic potential controller ( ) adjusts potential difference between the electrodes ( ) such that oxygen is generated in seawater while generation of chlorine in seawater is suppressed. An external dc power unit ( ) and a cathodic protection electrode ( ) supply a cathodic protection current to the tubes ( ).

Antifouling system for structure exposed to seawater and heat exchanger

An antifouling system ( ) for a structure exposed to seawater has an anode forming member ( ) bonded to the seawater-exposed surface to be wetted with seawater ( ) of the structure via an insulating adhesive ( ). The anode forming member is coated with an electrical catalyst film of an electrochemically active and stable electrical catalyst. A conductive member ( ) is disposed so as to be wetted with seawater ( ). An external dc power supply ( ) has a positive terminal ( ) connected to the anode forming member ( ) and a negative terminal ( ) connected to the conductive member ( ). The external DC power supply ( ) is provided with a built-in automatic potential controller ( ) that controls the potential difference between the positive terminal ( ) and the negative terminal ( ) such that oxygen can be generated in seawater suppressing the generation of chlorine in seawater. Even if a rubber lining coating a metal part of the structure is broken, abnormal corrosion of the metal part corresponding to a damaged part of the rubber lining can be prevented.

Marine organism prevention system for structures in seawater

A feed water heater has a longitudinally cylindrical body comprising a cylindrical shell portion constituting a main body portion of a feed water heater and a water box-shaped chamber operatively connected to the cylindrical shell portion and partitioned by a tubesheet. In the cylindrical shell portion, a heat exchanger tube bank is arranged and supported by a plurality of support plates, a drain cooling section is disposed in association with the heat exchanger tube bank for carrying out a heat recovery of a drain generated in the heat exchanger tube bank, a dilution condensing chamber is provided for the heat exchanger tube bank and adapted to excessively flow the steam into the heat exchanger tube bank, and a non-condensable gas chamber is provided for the heat exchanger tube bank. The drain cooling section, the dilution condensing chamber and the non-condensable gas chamber are arranged axially in this order in the cylindrical shell from the tube sheet.

Feed water heater

Growing community of inventors

Yokohama, Japan

Shoji Nakashima