甲烷-氮气-氢气体系低温精馏控制策略改进.pdf

第45卷第6財
化学
Vol 45 No6
2017年6月
CHEMICAL ENGINEERING(CHINA)
Jun.2017
甲烷-氮气-氢气体系低温精馏控制策略改进
唐守胜,任小坤,孙,张武
(中国科学院低温工程学重点实验室(理化技术研究所),北京100190)
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牛产需要。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某础上,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十抗和有十扰(脉
冲式波动)情况下的调节能力。根掘计算结果分析,现有控制系统存在一定的局限性,于是提出将单凹路反馈控制
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下拢对精留塔的影响,造成生
系统再次稳定所时间长、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下扰的
能力,大大增强了系统的鲁棒性。
关键词:低溋榯馏;动态模拟;控制策略;鲁棒性;均匀级控制
中图分类号:TQ021.8
文献标识码:A
文章编号:1005-9954(2017)06-0069-05
DO1:10.3969/j.isn.1005-9954.2017.06.01.3
Improved control strategies of cryogenic distillation for CH,-N2-I, system
TANG Shou-sheng, REN Xiao-kun, SUN Yu, ZHANG Wu
(Key laboratory of Cryogenics, Technical Institute of Physics and Chemistry
Chinese Academy of Sciences, Beijing 100190, China
Abstract: As an important part of engineering design, the control system is usually designed based on experiences
But in some cases, the control system designed in this way cannot meet production needs. The control strategies
optimization of cryogenic distillation for a CH, -N2-H2 system was studied in this paper. It was based on actual
production data which was collected from a typical industrial off-gases recovery unit. Dynamic process simulation is
a tool to evaluate operational issues of a new process concept before the plant construction. A dynamic model o
cryogenic distillation was developed with Aspen Hysys software in order to study the dynamic behavior of the CH
N2 -H system. The adjustment ability of existed control strategies with or without pulse disturbances was analyzed
ccording to the results of calculation, some limitations of existed control strategies were observed and the modified
control strategies (even-cascade control instead of single loop feedback control for the gas-liquid separator and
distillation tower were proposed and calculated. The results show that the existed control system would lead to
some problems such as disturbances magnification, longer re-stabilization time and products composition deviation
from design value. Consequently, the improved control strategies were presented to improve the system robustness
against pulse disturbances
Key words: cryogenic distillation; dynamic simulation; control strategy; robustness; even-cascade control
低温精馏是混合气体分离常用的技术之一,其有广泛应用,同时也是化工废气资源化利用常用
原理是采取一定的技术手段将废气液化或部分液分离技术。
化,利用各组分的挥发度不同,在低温条件下采用精
近年来,化工废气所含甲烷的经济价值受到关
馏技术实现组分分离。低温精馏技术在空气分注,化工废气(如合成氨尾气、兰炭尾气、焦炉媒气
离、石油炼化、煤气化、氢同位素分离等领域均等)综合利用副产液化天然气(ING)成为研究热
收稿日期:2016-07-I0
作者简介:唐守胜(1984-),男,硕士,下程师,从事低温工程学下业化应用和工业废气资源化研究,地话:(010)62556111E-mail:sang@
mall. Ipc ac, e
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