Abstract
In black liquor recovery boilers (BLRB) used in the paper industry, the materials have to withstand a combination of high temperatures and very corrosive environments. The material studied in this paper is used in pipes for applications in a part of the BLRB functioning as a large heat exchanger, where chemicals are recovered from the pulping process and at the same time organic waste is converted to energy. In the boiler black liquor, containing Na2S04 with a pH of 12 to 14, is cleaned from the waste originating from the process of converting wood to fibre for paper production. The cleaning process includes reducing the Na2S04 to Na2S and burning off the waste, resulting in a high temperature at the pipes in which water is circulated to recover the heat. As a result the pipes are subjected to a high temperature and an aggressive alkaline environment due to the black liquor.
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