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01173 RECENT TRENDS IN CORROSION-RESISTANT TUBE MATERIALS AND IMPROVEMENTS OF CORROSION ENVIRONMENTS IN WTE PLANTS

Picture for 01173 RECENT TRENDS IN CORROSION-RESISTANT TUBE
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Product Number: 51300-01173-SG
ISBN: 01173 2001 CP
Author: Yuuzou Kawahara and Yuuji Kaihara
Industry: Energy Generation
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In order to increase the electric power generating efficiency and reduce the total cost of a waste-to-energy (WTE) plant, it is important to develop and apply suitable corrosion-resistant materials and a system capable of moderating the environment in a waste combustion boiler. In modem highly efficient WTE boilers, the environment is extremely corrosive and the gas temperature is high and fluctuates widely. Under these conditions, metal temperatures exceed 500°C and metal surfaces may be covered with deposits containing high levels of chlorides. For these reasons, the use of corrosion-resistant alloy tubes such as alloy 625, alloy 45TM, and Sanicro 63 (composite tube) in superheaters and waterwalls is becoming common. These alloys contain Mo, Nb, and Si, elements that are known to be effective in improving corrosion resistance in Ni-Cr-Fe alloys. These elements are active in the formation of stable oxide layers and are less reactive under chlorinating conditions. It is also important to moderate the corrosion environment, and to this end, waste gasification and ash- melting plants utilizing thermal decomposition furnaces to eliminate chlorine have been developed in Japan. In these plants, it is possible to use inexpensive alloys in superheaters. This report presents the service life, effect of alloying elements, corrosion mechanism of corrosion- resistant materials applied to WTE plants, and also the moderation of corrosion environments by thermal decomposition.

Keywords: high temperature corrosion, waste-to-energy plant, boiler tube, corrosion-resistant materials, spray coating, weld overly, service life, waste gasification, corrosion mechanism, alloying element, thermal decomposition.
In order to increase the electric power generating efficiency and reduce the total cost of a waste-to-energy (WTE) plant, it is important to develop and apply suitable corrosion-resistant materials and a system capable of moderating the environment in a waste combustion boiler. In modem highly efficient WTE boilers, the environment is extremely corrosive and the gas temperature is high and fluctuates widely. Under these conditions, metal temperatures exceed 500°C and metal surfaces may be covered with deposits containing high levels of chlorides. For these reasons, the use of corrosion-resistant alloy tubes such as alloy 625, alloy 45TM, and Sanicro 63 (composite tube) in superheaters and waterwalls is becoming common. These alloys contain Mo, Nb, and Si, elements that are known to be effective in improving corrosion resistance in Ni-Cr-Fe alloys. These elements are active in the formation of stable oxide layers and are less reactive under chlorinating conditions. It is also important to moderate the corrosion environment, and to this end, waste gasification and ash- melting plants utilizing thermal decomposition furnaces to eliminate chlorine have been developed in Japan. In these plants, it is possible to use inexpensive alloys in superheaters. This report presents the service life, effect of alloying elements, corrosion mechanism of corrosion- resistant materials applied to WTE plants, and also the moderation of corrosion environments by thermal decomposition.

Keywords: high temperature corrosion, waste-to-energy plant, boiler tube, corrosion-resistant materials, spray coating, weld overly, service life, waste gasification, corrosion mechanism, alloying element, thermal decomposition.
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