制氢装置反应器安全阀管道设计探讨

Piping design for safety valve of hydrogen generation reactor

对反应器安全阀管道的布置方案进行应力分析,结果表明,当安全阀管道在构架顶平台上设水平π形弯(方案1)时,安全阀管嘴x,y,z方向的最大力矩依次为136,24,56 N·m;x,y,z方向的最大位移依次为0.25,42.92,0.68 mm;支架PS-4点的应力为148 933.6 k Pa,而该处所能承受的最大应力值为105 683.0 k Pa,应力校核不满足设计要求。在方案1的基础上进行优化,将安全阀后的切断阀移至立管放置,即在管道上增设两个垂直的π形弯来改善管道柔性(方案2)后,安全阀管嘴x,y,z方向的最大力矩依次为235,19,68 N·m;x,y,z方向的最大位移依次为0.36,42.92,1.35 mm。各点的应力值均在允许范围之内。两种方案管嘴受力均较小,经过法兰泄漏性校核,不会导致法兰泄漏或者设备嘴子根部应力超标。方案2当水平π形弯的臂长由1 000 mm增加到1 500 mm后,支架PS-1点的垂直位移由16.64 mm减小到4.85 mm,且无需设置弹簧支架。

The stress analysis of the piping layout for reactor safety valves was performed. The results showed that,when the safety valve pipeline has horizontal π type bending on the support platform,the safety valve nozzle＇s maximum force in x,y and z directions in Layout Ⅰ is in the order of 136,24 and 56 N·m and the maximum displacement is in the order of 0. 25 mm,42. 92 mm and 0. 68 mm. Stress on PS-4 point is148 933. 6 k Pa,but the maximum allowable stress is 105 683 k Pa. The stress analysis check fails to meet the design requirement. After optimization of Layout Ⅰ,i. e. the shut-off valve behind the safety valve is moved to the vertical pipeline and two vertical π type bendings are provided on the pipeline to improve the pipeline flexibility（ Layout Ⅱ）,the safety valve nozzles maximum forces in x,y and z directions in Layout Ⅱ are235,19 and 68 N·m respectively,and the maximum displacements in x,y and z directions are 0. 36 mm,42. 92 mm and 1. 35 mm respectively. Stress values of all points in Layout Ⅱ are within the allowable range.The nozzle stresses of two layouts are small. The flange leakage check confirms that there is no leak of flange or excessive equipment nozzle stress. When the horizontal π type bending is extended from 1 000 mm to 1 500 mm,the vertical displacement of PS-1 point of support is reduced from 16. 64 mm to 4. 85 mm. In this case,the spring supports and hangers are not required. The proper position design of the pipe supports and hangers is the key factor in pipe stress checking.