基于HAZOP的压缩机优化设计可靠性评估

大型天然气往复式压缩机结构复杂,在设计过程中需要进行多次优化,但优化设计通常仅考虑单个零部件的要求,使其优化结果对于其他零部件和压缩机整体性能考虑不足,常常出现零部件返工、整体质量不合格等问题。提出了一种基于HAZOP(Hazard and Operability Analysis)的压缩机优化设计可靠性评估方法:构建压缩机层级结构,对设计变化信息在单元界面之间的传递过程开展研究,采用HAZOP对信息传递路径中导致的后果进行可靠性评估,在设计阶段制定合理的应对措施。将该方法应用于某压缩机曲轴优化设计中,结果表明:在确保压缩机可靠性的前提下,该方法将曲轴主轴颈和曲柄销直径从182.8 mm优化至177.8 mm。基于HAZOP的压缩机优化设计可靠性评估方法充分考虑了设计信息变化对其他单元及压缩机整体性能的影响,提高了压缩机的可靠性。

Reliability evaluation of optimization design of compressor based on HAZOP

Large-scale gas reciprocating compressor needs optimizing many times in the process of design due to its complex structure. However, only the demand of individual component is taken into consideration during the optimization design, and the demand of other components and the overall performance of the compressor are not considered sufficiently in the optimization result. As a result, some problems occur frequently, such as component rework and poor overall quality. To solve these problems, a reliability evaluation method of optimization design of compressor based on Hazard and Operability Analysis(HAZOP)was proposed in this paper. In this method, compressor hierarchical structure is constructed, the transmission process of design change information between unit interfaces is investigated, reliability evaluation is carried out on the influence consequences in the information transmission path by HAZOP, and the reasonable countermeasures are prepared in the design stage. This method was applied to the design optimization of the crank shaft of one certain compressor. It is indicated that on the premise of ensuring the reliability of the compressor, this method optimizes the diameters of the crank shaft king journal and crank pin from 182.8 mm to 177.8 mm. In conclusion, this reliability evaluation method for optimization design of compressor based on HAZOP considers fully the effects of design information change on the other units and the overall performance of the compressor, so it improves the reliability of compressors.