储液高度对氧化风机塔结构抗震性能影响的研究

Study on effect of liquid storage height on seismic performance of absorber feed tank

电力设施工程当遭受地震灾害时发生破坏,将严重影响灾区人民生产生活和应急救援工作的开展。氧化风机塔(Absorber Feed Tank,简称“AFT”)是服务于火力发电清洁脱硫工艺环节中的一种钢筋混凝土结构支撑钢罐的复合结构,其上部钢罐日常存储有大量液体。考虑液体的减震作用,建立AFT塔的有限元模型,以持液体高度10~20m作为自变量,进行模态分析,根据现场监测结果验证了模型的可靠性,并输入地震波进行动力时程分析,结果表明:AFT塔水平位移响应随着浆液高度的增加而变化,而这种变化趋势随所遇地震加速度幅值不同而表现不同。AFT塔下部的水平加速度响应峰值随浆液高度增加而增大,并且随着输入的地震加速度幅值增大,峰值位置从混凝土框架的顶板开始逐步下移。综合位移和加速度响应结果,表明AFT塔在持液18m时具有较好的抗震性能。

When the power facility project is damaged by the earthquake,it will seriously affect the production and life of the people in the disaster area and the implementation of emergency rescue work.Absorber Feed Tank(AFT)is a composite structure of reinforced concrete structure supporting steel tank serving the clean desulfurization process of thermal power generation.A large amount of liquid is stored in the upper steel tank.Considering the damping effect of liquid,the finite element model of AFT tower is established.The modal analysis is carried out with the liquid holding height of 10~20m as the independent variable.The reliability of the model is verified according to the field monitoring results,and the seismic wave is input for dynamic time history analysis.The results show that the horizontal displacement response of AFT tower changes with the increase of slurry height,The variation trend is different with the amplitude of earthquake acceleration.The peak value of horizontal acceleration response at the lower part of AFT tower increases with the increase of slurry height,and with the increase of input seismic acceleration amplitude,the peak position gradually moves down from the top plate of concrete frame.The comprehensive displacement and acceleration response results show that the AFT tower has good seismic performance when the liquid holding capacity is 18m.