求助，aspen吸收问题

santhy

最近做了氨水吸收SO2的例子，总是出现问题，总是显示
Block: ABSROBER 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.
  *   WARNING
      REST OF BLOCK BYPASSED DUE TO SEVERE ERROR.

   Block: MIXER1   Model: MIXER
   Block: FSPLIT   Model: FSPLIT
  *   WARNING
      OUTPUT STREAM "PRODUCT1" HAS STREAM ORDER (1) SPECIFIED,
      BUT THE SUM OF SPLIT REACHES 1. THE SPECIFICATION IS TREATED AS
      A LIMIT FLOW, AND THE REST OF STREAMS WILL NOT BE PROCESSED.

> Loop $OLVER01 Method: WEGSTEIN     Iteration    1
# Converged              Max Err/Tol   0.00000E+00
  *   WARNING IN PHYSICAL PROPERTY SYSTEM
      ATTEMPT TO USE MODEL ELECNRTL WITHOUT A SOLVENT.
      ACTIVITY COEFFICIENT OF UNITY IS USED
  *   WARNING IN PHYSICAL PROPERTY SYSTEM
      ATTEMPT TO USE MODEL ELECNRTL WITHOUT A SOLVENT.
      ACTIVITY COEFFICIENT OF UNITY IS USED
  *   WARNING IN PHYSICAL PROPERTY SYSTEM WHILE PERFORMING INITIAL ENTHALPY
      CALCULATIONS FOR STREAM: "AIR"
      ATTEMPT TO CALCULATE ENTHALPY FOR ELECNRTL MODEL WITHOUT A SOLVENT.

   Block: OXITATER Model: RSTOIC
   Block: SEP      Model: FLASH2
   Block: MIXER2   Model: MIXER
->Simulation calculations completed ...

                          ***  Summary of Errors  ***
                   Physical
                   Property         System        Simulation
  Terminal Errors      0               0               0
    Severe Errors      0               0               1
           Errors      0               0               0
         Warnings      3               0               2
都改了好多次了，就是不知道怎么回事，不知从何下手啊。希望各位高手帮忙看下。

归尘

*** 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.

这是你的错误，大概是塔顶回流比的问题，你应该是没有设置。 这只是根据翻译得到的结果啊