Analysis of the Hygas Ash-Agglomerating Gasifier Internal Cyclone Dipleg Failure: Failure Analysis Report

摘要

The results of the analysis of the Ash-agglomerating Gasifier (AAG) internal cyclone dipleg from the HYGAS pilot plant are summarized. The dipleg is attached to the cyclone, which removes particulate matter from the hot produce gases and recycles it through the gasifier. A flapper valve at the bottom of the dipleg is closed to permit half of the dipleg to fill with pulverized particulates. During normal operation, the dipleg is exposed to a steam and oxygen environment with temperatures near the bed temperature of 1038 exp 0 C. The failure of the dipleg, fabricated of Incoloy 800, is believed to be associated with sulfidation and carburization coupled with high-temperature (off-process) operation. (ERA citation 03:000008)