The vibrations’ study to the burn gas exhaust fan from a thermoelectric power plant

摘要

The paper presents a diagnose analysis for an industrial fan having vertical axis rotation, which shows dangerous levels of vibration. The fan ejects the flue gases from a thermoelectric power plant. This is located and isolated on the roof of the power plant building by some elastic elements, in the form of some cassettes with coil springs. The cassettes are arranged symmetrically along the separation plane. The experimental research has been carried out in two steps. In the first step, we designed and we studied in laboratory a mathematical model to reproduce a real situation of the fan insulation. In the second step, we made experimental investigations on the spot. Comparing the measured vibration amplitudes to those obtained on mathematical model, we identified a hidden connection near one of cassettes with coil springs. The hidden connection has appeared during the cassettes mounting and so was created a mechanical asymmetry. Due to this, the dangerous levels of vibration have occurred and it was caused a temporary shutdown of the fan. The process for detecting and eliminating the mounting nonconformities it is presented in the paper.