Tlumení Samobuzených pulsací v naftovém potrubí

Damping of Self-Excited Pressure Pulsations in Petrodiesel Pipeline

conference paper

en

A pumping station in a fuel storage suffered from pressure pulsations in a petrodiesel pipeline. Check valves protecting the station against back flow made a big noise when disc hit a seat. Due to employees complaints we were asked to solve the problem, which could lead to serious mechanical problems. Pressure measurement in the pipeline showed great pulsations, which were caused by self-excited oscillation of control valves at the downstream end of pipeline. The operating measurement did not catch it because of too low sampling frequency. One dimensional numerical model of the whole hydraulic system was carried out. The model consisted of check valve, pipeline and control valve, which could oscillate, so it was possible to simulate the unsteady flow. When the model was validated, a vessel with nitrogen was added to attenuate pressure pulsations. According to the results of numerical simulation, the vessel was installed on the location. Subsequent measurement proved noticeably lower pulsations and almost no noise.

Čerpací stanice ve skladu paliva trpěla tlakovými pulsacemi z naftového potrubí. Zpětný ventil chránící stanici před zpětným prouděním vydával velký hluk, když disk dopadal do sedla. Díky stížnostem zaměstnanců jsme byli požádáni, abychom vyřešili problém, který může vést k vážným mechanickým závadám. Měření tlaku v potrubí prokázalo velké pulsace, které byly vyvolány samobuzeným kmitáním řídicího ventilu na konci potrubí. Provozní měření nic nezachytilo kvůli nízké frekvenci snímkování. Byl vypracován jednodimenzionální numerický model celého hydraulického systému, který se skládá ze zpětného ventilu, potrubí a řídicího ventilu, který může oscilovat, takže bylo možné simulovat nestacionární proudění. Podle výsledků numerické simulace byla na potrubí nainstalována tlaková nádoba. Následné měření prokázalo výrazný pokles pulsací a téměř žádný hluk.

A pumping station in a fuel storage suffered from pressure pulsations in a petrodiesel pipeline. Check valves protecting the station against back flow made a big noise when disc hit a seat. Due to employees complaints we were asked to solve the problem, which could lead to serious mechanical problems. Pressure measurement in the pipeline showed great pulsations, which were caused by self-excited oscillation of control valves at the downstream end of pipeline. The operating measurement did not catch it because of too low sampling frequency. One dimensional numerical model of the whole hydraulic system was carried out. The model consisted of check valve, pipeline and control valve, which could oscillate, so it was possible to simulate the unsteady flow. When the model was validated, a vessel with nitrogen was added to attenuate pressure pulsations. According to the results of numerical simulation, the vessel was installed on the location. Subsequent measurement proved noticeably lower pulsations and almost no noise.

Noise; pressure pulsations; valve oscillation; numerical model

2014

03.09.2014

Trans Tech Publications

Švýcarsko

978-3-03835-241-9

1662-7482

Applied Mechanics and Materials

630

2014

375–282

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