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aspen用radfrac模块模拟吸收时出现如下现象，请高手指点
Processing input specifications ...
INFORMProcessing input specifications ...
INFORMATION
BINARY PARAMETERS PRKIJ (DATA SET 1) FOR MODEL ESPRSTD
ARE RETRIEVED FROM SDF TABLE. TABLE NAME = ESPRSTD
Flowsheet Analysis :
COMPUTATION ORDER FOR THE FLOWSHEET:
B1
->Calculations begin ...
Block: B1 Model: RADFRAC
Convergence iterations:
OL ML IL Err/Tol
1 1 3 215.03
2 1 10 686.78
3 1 10 759.04
4 1 10 844.55
5 1 10 946.31
6 1 10 1068.6
7 1 10 1167.9
8 1 5 218.22
9 1 3 33.992
10 1 5 4.0895
11 1 6 1.8688
12 1 4 0.81057
*** SEVERE ERROR
THE FOLLOWING STAGES DRIED UP (VAPOR OR LIQUID FLOW APPROACHES 0):
1 2
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.
->Simulation calculations completed ...
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