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Sueyoshi, Mitsuhiro,Furue, Toshihiko,Sato, Akihiro,Yokoyama, Kenichi,Yamadera, Yoshimi,Fujiwara, Kiyoshi,Matsuda, Katsuhiko 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
Aluminum brass tubing which is highly cost-effective and has a high heat transfer property has been widely used for seawater cooled condenser in Japan. However, the tubing suffers from erosion and corrosion on the inner surface in spite of ferric-ion injection and cathodic protection. Ammonia also attacks the outer surface after long years of service. Periodic replacement with new tubing has been performed. Titanium tubing which has high corrosion resistance, has been used in new condensers and for the air removal zone of the condenser. However, its service has been restricted due to higher cost and lower elastic modulus. As a countermeasure, we have developed a high performance ferritic stainless steel tubing called "Super Stainless: FS1O" which has excellent corrosion resistance and is highly cost-effective. First, the tubings were used experimentally in our Buzen thermal power station, Unit 2 condenser in 1993, and various investigations have been performed on the extracted tubing and tube sheet every year. Ammonia attack on the outer surface, corrosion and erosion on the inner surface, crevice corrosion between the tube and the tube-sheet. Hz absorption and degradation of properties was not observed. Based on these results, 1,006 pieces of FS1O were installed in Buzen thermal power station, Unit I condenser in 1996. The tubing has been used in seawater without any corrosion problems.
Coal Type Selection for Thermal Power Plants through Combustion State Estimation
Satoru GOTO,Shinji KATAFUCHI,Mitsuhiro SUEYOSHI,Toshihiko FURUE,Yoshitaka UCHIDA,Hironori HATAZAKI,Masatoshi NAKAMURA 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, a coal type selection method for a coal fired boiler in a thermal power station is proposed. Combustion of coal and fusibility of fly ash are evaluated by using coal and fly ash properties. Combustion state in a coalfired boiler is estimated by the evaluated combustibility of coal and fusibility of fly ash. Applicable coal type is selected by the estimated combustion state. The proposed coal type selection method is evaluated by the data collected in an actual thermal power plant.