甲烷-氮气-氢气体系低温精馏控制策略改进

发布时间：2018-08-01 10:54

【摘要】：控制系统设计是工程设计的重要组成部分,通常根据经验进行设计。但是在某些情况下,采用这种方式设计的控制系统不能满足生产需要。以一个典型的化工尾气回收装置为例,在现场收集的实际生产数据基础上,利用软件Aspen Hysys对甲烷-氮气-氢气体系的低温精馏过程建立动态模型,考察现有控制系统在无干扰和有干扰(脉冲式波动)情况下的调节能力。根据计算结果分析,现有控制系统存在一定的局限性,于是提出将单回路反馈控制改为均匀串级控制的改进方案,并进行计算分析。结果表明:现有的控制系统会放大干扰对精馏塔的影响,造成生产系统再次稳定所需时间长、产物组成偏离设计值等问题;改进的控制策略有效地改善了系统应对脉冲式干扰的能力,大大增强了系统的鲁棒性。
[Abstract]:The design of control system is an important part of engineering design, which is usually designed according to experience. But in some cases, the control system designed in this way can not meet the needs of production. A typical chemical tail gas recovery device is taken as an example. On the basis of actual production data collected in the field, the software Aspen Hysys is used to the one. The dynamic model of the low temperature distillation process of the alkane nitrogen gas hydrogen system is set up to investigate the adjustment ability of the existing control system under the condition of non interference and interference (pulse wave). According to the analysis of the calculation results, the existing control system has some limitations, and the improvement scheme of the single loop feedback control is proposed to the uniform cascade control. The results show that the existing control system will enlarge the influence of interference to the distillation tower, cause the time of the production system to be stable again, the composition of the product deviate from the design value and so on. The improved control strategy can effectively improve the system's ability to deal with pulse interference and greatly enhance the robustness of the system.
【作者单位】：中国科学院低温工程学重点实验室(理化技术研究所);
【分类号】：TQ028.31

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