Treatment And Research On Vibration Of Air-cooling Island Of Cement Waste Heat Generator Unit

In the cement waste heat power generation system,to reduce the use of water resources,air cooling technology is widely used.However,there are numbers of rotating equipment in the cement production process,and the load generated by this part of the equipment during operation will affect the normal operation of the aircooling system based on the air-cooling island platform.The research on the propagation law of vibration generated by such rotating equipment and the vibration reduction and isolation measures is of great significance to the normal operation of the air-cooling island of the cement waste heat power generation system.In this paper,combined with the current situation of excessive vibration of the air-cooled island structure of a cement waste heat power plant in Xishan,Shanxi,the problem of excessive vibration of the air-cooled island structure is studied:(1)Starting from the theory and combining the characteristics of the soil,the elastic wave transmission characteristics and attenuation characteristics are studied,and the vibration wave generated by the vibration of the raw material mill is analyzed.The transmission law of the vibration wave transmitted through the soil layer to the air-cooling island is obtained,thereby obtaining the equipment vibration of the aircooling island.The reason for exceeding the standard.(2)According to the actual parameters of the air-cooling island of the cement waste heat power plant,the different load conditions of the air-cooling island are analyzed.The reinforced concrete structure is used to establish a three-dimensional model and conduct modal analysis.The results show that the main vibration mode of the air-cooling island is the first two order formation,and the corresponding vibration frequency is about 2 Hz.(3)According to the local soil conditions,a three-dimensional model of vibration source-soil-air-cooling island is established,and viscoelastic artificial boundary elements are used to constrain the boundary,the element size of the model is set to simulate the response of the air-cooling island affected by vibration.It has been verified that the simulation results using this model are consistent with the actual situation,indicating the applicability of the model.(4)The vibration source and response results are analyzed in the time domain and frequency domain.The results show that in the process of vibration transmission,highfrequency vibration has greater energy dissipation,while low-frequency vibration has relatively small energy dissipation.The method of using vibration isolation trench is proposed to achieve the purpose of vibration reduction.(5)Analyzing the influence of different parameters of the vibration isolation trench on the vibration isolation effect,it is concluded that the double trenches vibration isolation effect is better than that of the single trench vibration isolation.The depth of the trench has the greatest impact on the vibration isolation effect of the vibration isolation trench,but when the trench depth is too large,the vibration isolation effect has no obvious gain or even a slight rebound.The location of the vibration isolation trench from the vibration source,the spacing between the isolation trenches and the width of the trench all have a certain impact on its vibration isolation effect.The vibration isolation effect will first increase and then decrease as the values of these three items increase.