High temperature corrosion of the thermocouple protection tubing in the coal gasification furnace

摘要

The purpose of this study is to improve the life of sensors used to monitor the internal temperature of a coal gasification furnace, which has a strong reducing atmosphere. This paper reports the results of a comparison study of corrosion between protection tubes made from chromium, known for corrosion resistance, and iridium, commonly used in this application. It was confirmed during this study that the pure chromium tube had a life at least 2.5 times longer than that of a pure iridium tube.