精馏塔用严格法出错，求助
ASPEN模拟后出现这样的错误警告，请问要如何修改？我先是用DSTWU简捷运算，之后用RADFRAC严格法计算就出现这样的问题。Block: RADFRACModel: RADFRAC INFORMATION FLASH RESULTS ARE WITHIN TOLERANCE, BUTMAY BE UNSATISFACTORY BECAUSE EXTRAPOLATED EOS VAPOR VOLUME ROOT WASUSED FOR PROPERTY CALCULATIONS. COMPOSITE FEED FLASH FAILED TO CONVERGE;COLUMN CALCULATIONS CONTINUE. IF CALCULATIONS FAIL, SUPPLY T-EST ANDOPTIONALLY BOTH X-EST AND Y-EST. Convergence iterations: OLML IL Err/Tol 1 1 10 640.13 2 1 10 220.53 3 1 3 105.41 *** SEVERE ERROR THE FOLLOWING STAGES DRIED UP (VAPOR ORLIQUID FLOW APPROACHES 0): 412 A LIMIT OF0.10000E-04 * SUM OF FEEDS WAS IMPOSED ON THEFLOW RATES OR A LIMIT OF0.10000E-04 WAS IMPOSED ON THE STAGE V/L ORL/V RATIO. INFORMATION CALCULATED REBOILER DUTY IS NEGATIVE.
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