Abstract
A field vibration test was conducted on the coal crusher chamber of a thermal power plant to evaluate its vibration performance. The vibration displacements and velocities of the structure, coal crusher body, and vibration-isolation platform were tested. The vibration safety of the coal crusher chamber and the vibration-isolation efficiency of the spring vibration-isolation system were evaluated based on the test results, and the reason the vibration exceeded the limit was analyzed. This study showed that the vibration displacement of a coal crusher with a spring vibration-isolation system met the code requirements, but the equipment had greater vibration displacements, which were related to the connection between the equipment and the platform. Compared to a steel platform, the vibration displacement of a concrete platform was smaller, and the vibration-isolation efficiency was greater. The vibration displacements of the coal crusher body could be reduced by controlling the vibration displacements of the platform.
Highlights
Coal crushers are important auxiliary dynamic machines in thermal power plants and are used for crushing and processing raw coal
Liu et al regarded the dynamic machine foundation and its surrounding structures are considered as a complete coupling object and proposed a three-dimensional finite element method for calculating the dynamic response of a large machine based on soil-structure interaction, and the main factors affecting its dynamic response are discussed [8]
Vibration tests were conducted during the steady operation stage of the coal crusher, with the vibration displacements and velocities measured using the described transducers
Summary
Coal crushers are important auxiliary dynamic machines in thermal power plants and are used for crushing and processing raw coal. Researchers usually use field tests and numerical analysis methods to study the structural vibrations caused by machine vibration [10]. Many engineering technicians use two methods to reduce structural vibration: increasing the rigidity and quality of the coal crusher chamber and machine foundation and using a coal crusher vibration-isolation platform. Even when using the same design scheme and machine parameters, the vibration problem for the coal crusher chamber is more prominent in some power plants, whereas other vibrations are very small. Vibration tests were performed on coal crusher chambers in three power plants, and the safety of the equipment and structure was evaluated based on the test results. The vibration-isolation efficiency of the spring vibration-isolation system was calculated. ese data provided a basis for finite element modeling
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