07352 Contribution of Nickel Alloys in Solving Aqueous and High Temperature Corrosion Problems in Incinerators and Vitrification/Management of Nuclear Waste

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Product Number: 51300-07352-SG

ISBN: 07352 2007 CP

Author: Dinesh C. Agarwal

Publication Date: 2007

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With conventional landfills becom ing both scarce and costly and deep well injection being highly restricted, controlled high temperature incineration is playing an increasingly important role in waste management and at the same time generating power for industry / consumer use. Depending on the chemical make-up of the waste (both municipal and hazardous industrial waste) and combustion conditions, a multitude of harmful acidic gases and deposits are produced which lead to a variety of high temperature severe corrosive environments resulting in accelerated metal wastage. The acidic gases produced during incineration of the chlorinated hazardous wastes must be scrubbed out or neutralized prior to release to the atmosphere. Typically most of the modern incineration systems consist of a high temperature incinerator chamber, a heat recovery system, a quench section to further reduce the temperature of the flue gas stream and a host of pollution control equipment to scrub acidic gases and control the particulate emissions. Hence reliability of high temperature section components and pollution control section components becomes a major concern. This paper discusses the contributions of nickel alloys in providing the necessary reliability in combating the corrosion problems. Another area of concern in the industry has been with the management of nuclear waste via vitrification technology. Research in USA has shown that alloys containing 50 wt% Nickel, 25 wt% Chromium and additions of 2 to 3% of either Aluminum or Silicon performed comparably or slightly better than alloy 690 ( UNS N06690), the current material of choice in glass melters. Cogema / Framatome in France have been successfully using a Ni-Cr-Al Alloy 602CA (UNS N06025) as fusion pots for their vitrification plant at La Hague in Europe. This paper gives a brief description of various nickel alloys, their corrosion resistance properties, fabricability and case histories in these industries.