Definition of a system to extract hot gas from an entrained flow gasifier

Abstract: This project work covers the design and construction of a new probe system for hot gas analysis in an entrained flow gasifier. The aim is a probe that can be used more flexibly than the present system. As a further aim, the condensation of trace materials has to be prevented. First, a short overview over current techniques to analyse the product gas in a gasification process is given. Continuing, the report describes the finding and assessing of several possible principles of hot gas extraction from a gasification process using simulations in ANSYS Fluent. The best performing design based on defined trace component condensation is built for a verification experiment and tested under controlled conditions in a tube furnace. Verification experiments comprise temperature measurements and analysis of retrieved samples via x-ray induced fluorescence. Temperature measurements show that the planned effect of mixture cooling is exceeded by far by convective cooling of the probe. Although simulations were promising, the approach is not applicable under current operating conditions due to problems with the measurement system. Furthermore, the amount of condensed trace material in the retrieved samples proves not to be sufficient for quantitative analysis via x-ray fluorescence. An alternative system to retrieve hot gas while maintaining it at high temperatures out of the gasifier is then modeled.