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In view of the dangerous condition in which a 300MW “W” type flame boiler has low frequency and large sloshing in its front wall, the peak amplitude and frequency range of vibration are obtained by field vibration test. Based on the finite element ANSYS software, a three-dimensional finite element model of the boiler wall was established by using beam and shell elements and the prestressed modal analysis of the furnace wall was carried out. Compared with the vibration test results, it was found that external excitation frequency and natural frequency were on the beat. It was concluded that the main reason of the vibration was resonance caused by the negative pressure fluctuation and lack of rigidity. Furthermore, considering the characteristics of the full suspension of the furnace wall and avoiding affecting the normal expansion of the wall, a slidable shake stopping device was designed to increase the lateral stiffness of the wall, increasing natural frequency and avoiding the resonance region effectively. The test, simulation and the design idea of the device provide a useful reference for solving the general problem of the shaking of the furnace wall, and have positive significance to prolong the lifetime of the boiler units in stable working conditions.

Test, simulation and treatment of the large amplitude sloshing of a 300 MW W-shaped boiler wall