Materials testing in syngas coolers of coal water slurry fed gasifiers

Publisher Website
Google Scholar
Abstract
For the last 10 years Hoechst AG, KEMA N. V., and EPRI have studied materials performance in raw syngas heat exchangers of coal water slurry fed gasifiers. Initial experiments were carried out in a 165 tonnes per day demonstration plant; later experiments were carried out in a commercial plant and are still in progress. Water-cooled or steam-cooled test loops were used in both plants to simulate actual heat exchanger service as closely as possible. The first test loop was operated for 5500 h at metal temperatures ranging from 320–370°C. Despite these low temperatures, the corrosion rates observed were relatively high and were ascribed to the corrosive nature of the gasified fuel, which had a high sulfur and chloride content. The second test loop is still in operation. Results on the first 3600 h of operation are reported here. Both evaporator and superheater test loops were successfully operated. Corrosion rates were generally moderate, because of the gasification of a relatively clean coal and operating procedures preventing corrosion during down time. The effects of differences in fuel quality and operating practices on alloy performance are discussed.

This publication has 0 references indexed in Scilit: