乙酸+异丙醇 合成 乙酸异丙酯 不收敛 求各位帮忙
本帖最后由 x8908945 于 2014-12-26 23:27 编辑模拟结果无法收敛改了很多地方没结果请问要从哪里下手呢
求大神指点
错误讯息 Block: REACDIST Model: RADFRAC
*** SEVERE ERROR
A LIQUID FEED/PUMPAROUND TO THE TOP STAGE IS REQUIRED WHEN
"Q1=0" IS SPECIFIED IN "COL-SPECS"; REQUIRED FEED/PUMPAROUND
HAS ZERO FLOW.-----------------------------------------------------------------------------------------------
Block: STRIPPER Model: RADFRAC
*** SEVERE ERROR
COLUMN NOT IN MASS BALANCE.
CHECK FEEDS, PRODUCTS, AND COL-SPECS SKWS.
* WARNING
REST OF BLOCK BYPASSED DUE TO SEVERE ERROR.
Block: DECANTER Model: DECANTER
* WARNING
VAPOR PRESENT IN FEED TO BLOCK; VFRAC = 1.0000
-----------------------------------------------------------------------------------------------
* WARNING
REST OF BLOCK BYPASSED DUE TO SEVERE ERROR.
Block: DECANTER Model: DECANTER
* WARNING
VAPOR PRESENT IN FEED TO BLOCK; VFRAC = 1.0000
> Loop $OLVER01 Method: WEGSTEIN Iteration100
* WARNING
CONVERGENCE BLOCK $OLVER01 NOT CONVERGED IN 100 ITERATIONS
5 vars not converged, Max Err/Tol 0.28259E+02
**ERROR
Convergence block $OLVER01 did not converge
normally in the final pass
->Simulation calculations completed ...
***No Warnings were issued during Input Translation ***
***Summary of Simulation Errors***
Physical
Property System Simulation
Terminal Errors 0 0 0
Severe Errors 0 0 2
Errors 0 0 1
Warnings 0 0 108
遇到反应精馏流程不收敛问题,建议按以下步骤排查(针对你提供的报错信息重点处理):
1. **反应精馏塔(REACDIST)液相回流缺失**
- 检查塔顶冷凝器设置:当COL-SPECS中设定Q1=0(全凝器无热负荷)时,必须存在液相回流流股。两种解决方案:
(1) 添加顶部液相回流泵循环(pumparound),流量至少设为塔顶产物摩尔流量的0.1倍试算
(2) 改用分凝器模式(Q1>0),允许气相采出
2. **汽提塔(STRIPPER)质量不平衡**
- 核对塔底再沸器热负荷与进料组成匹配度:异丙醇-乙酸体系易形成共沸,建议:
(1) 用Design Spec功能反推再沸器热负荷范围
(2) 检查塔底产物阀门压力设定是否与塔压匹配,避免负压抽空
3. **倾析器(DECANTER)气相警告**
- 强制液相进料条件:在倾析器前添加冷却器(Flash模块),设置操作温度低于混合物的泡点温度(建议比泡点低5-10℃)
- 确认物性方法适用性:UNIQUAC或NRTL模型需完整输入乙酸-异丙醇-水-乙酸异丙酯的二元交互参数
4. **收敛加速技巧**
- 撕裂流(Tear)初始化:优先选择含关键组分(如乙酸异丙酯)的循环流作为撕裂流
- 迭代策略调整:将Wegstein法改为Newton法,适当增大最大迭代次数至200次
- 分步调试:先关闭反应器模块,仅调试分离系统至收敛后再激活反应
注:该体系需特别注意乙酸与异丙醇的酯化反应动力学设置,建议先采用平衡反应模型调试流程,收敛后再替换为实际动力学方程。典型工艺条件参考:反应段温度80-100℃,塔压常压~50kPa,醇酸摩尔比1.2-1.5:1。
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