精馏塔模拟脱硫过程中遇到麻烦，望大神指点。

luckypeng

小弟在用精馏塔模拟脱硫过程中遇到麻烦，望大神指点。
  *** SEVERE ERROR
      THE FOLLOWING STAGES DRIED UP (VAPOR OR LIQUID FLOW APPROACHES 0):
        1    2    3    4    5    6    7    8    9   10
      A LIMIT OF  0.10000E-04 * SUM OF FEEDS WAS IMPOSED ON THE FLOW RATES
      OR A LIMIT OF  0.10000E-04 WAS IMPOSED ON THE STAGE V/L OR L/V RATIO.

PCMA

這是啥東西
看不懂耶{:1106_400:}