Thermoacoustic pulsations caused by heat exchangers
15. May 2019, 9:00 a.m. CEST/ Speaker: Dr.-Ing. Christian Jansen
Fatigue failures of pipework can in many cases be traced back to elevated pressure pulsations. For applications utilizing rotating or reciprocating machinery the source of these pulsations is obvious. In these cases, pulsation and vibration studies are carried out to avoid acoustic resonances and pipeline vibrations. This is normally performed during the design and engineering phase or as part of an optimization project to increase the reliability and availability of an existing plant.
Flow-induced vibrations are a further source for fatigue issues at industrial plants. The vortex shedding and acoustic amplification at heat exchanger tubes and vessels is a prominent example for this. Knowing these issues, some effort is put into proper design to avoid this.
Quite unknown is the fact that a heat exchanger itself can under special conditions cause pulsations in the heated gas due to an effect called “thermoacoustic instability”. This effect has been observed at several gas metering stations and is considered as the root cause for a heavy fire in a gas metering station.
This webinar presents the theoretical background of pulsations caused by thermoacoustic instability. Furthermore, case studies are presented which demonstrate the measurement-based approach to analyze and solve these problems.