焦化装置分馏塔底泵进出口管道的应力分析

STRESS ANALYSIS OF THE INLET AND OUTLET PIPING OF FRACTIONATION TOWER BOTTOM PUMP IN COKING UNIT

为了确认泵口所受荷载不超过其允许值,需要对连接泵口的管系进行详细的模拟分析。运用应力分析软件,分别模拟了冷态和热态时管系对分馏塔底泵口的所受荷载;研究了泵口受到较大推力的原因;进而得到了能有效降低泵口所受荷载的配管方式。结果表明:进口管道如果配管不当使泵进口所受荷载超过了API610标准的21倍,是造成泵口被破坏以致泄漏的主要原因。同时,分馏塔底泵的进出口配管采用以下型式可很好的降低泵口的所受荷载:进口采用泵侧边布管并且采用T型过滤器加弯头与泵口直接连接,在过滤器处设弹簧支架;出口采用回型弯,在回型弯的地面支撑处设支架等措施。更改配管方式后,分馏塔底泵口的荷载都降至API610标准的3倍。最终,泵口所受荷载还必须得到厂家的确认合格。

To ensure that the load on pump nozzle doesn't exceed the allowed value,it is necessary to make a detailed simulation analysis on the piping connecting the pump nozzle.By using stress analysis software,the loads on fractionation tower bottom pump nozzles in cold and hot conditions were simulated,the reasons for the greater thrust to the pump nozzles were studied,and the piping design which can effectively reduce the loads on pump nozzles was obtained.The results showed that inappropriate piping design of pump nozzles would result in a load 21 times higher than the value specified in API 610.It is the main reason for the rupture and leakage of pump nozzles.The loads on pump nozzles can be effectively reduced by adopting the following inlet and outlet piping design for fractionation tower bottom pump,including placing the piping of pump suction nozzle beside the pump,connecting the pump nozzle with T filter with bend and installing spring support at the filter;providing elbow at the pump discharge nozzle and installing support on the ground at the elbow.By changing the piping design,the loads on fractionation tower bottom pump nozzles were reduced to about 3 times the value specified in API610.Finally,the loads on pump nozzles have to be confirmed by pump manufacturers.