基于层次分析法的冷箱冻堵调整

Adjustment of frozen blockage of cold box based on the analytic hierarchy process

关键词:  冷箱  冻堵  层次分析法  模拟仿真  应急处理 

Key words:  cold box  frozen blockage  analytic hierarchy process (AHP)  simulation  emergency treatment

摘要:

为了研究冷箱冻堵原因,量化分析问题,找出最佳调整方案, 结合某厂液化装置冷箱冻堵实例,收集冻堵前与紧急处理后数据,运用层次分析法结合专家经验建立数学模型。利用该模型,仿真模拟了在当前成本与风险下的最佳处理方案和应急处理方案,为冷箱冻堵调整提供了量化依据。研究结果表明,当前情况下可以均衡降量,同时关小LNG线、冷剂线截流阀进行应急处理,但不能根治问题。由此推测冷箱盘管有异物堵塞,需停产并拆卸冷箱对盘管、过滤器等附件进行检修。停产检修拆解情况与仿真模拟吻合,彻底解决了问题,说明该方法可行,可在其他装置上分析和处理类似问题。但层次分析法只能核算出各方案层权重值,为方案决策做出参考,暂不能得出可调区间及调整程度,下步仍需改进。 

Abstract:

In order to study the reason of frozen blockage, analyze problem quantitatively, and find out the best adjustment scheme, combined with the example of frozen blockage of cold box in one liquefying plant, the data before frozen blockage and after the emergency treatment are collected, then the mathematical model is established by using analytic hierarchy process (AHP) combined with expert experience. By using the model, the best treatment scheme and the emergency treatment plan under current cost and risk are simulated, and quantitative basis for adjustment of cold box frozen blockage can be provided. The simulating result shows that the quantity can be lowered equilibrium currently, at the same time, the intercept valves of LNG line and cooling line can be shut off for emergency treatment, but the problem can not be completely solved. So it is suspected that there is a blockage in cold box coil, shutdown must be done and the cold box must be disassembled to overhaul coil, filters and other accessories. The overhaul situation is in accordance with the simulation result. The problem has been solved completely, and it shows that the method is feasible and can be used to analyze and treat the same problem in other devices. But the AHP can be only used for accounting layer weight value of the program, and to make a reference for scheme decision-making. The adjustable range and degree can not be obtained at present, and the simulation model needs to be improved next step.