设计规定问题（更新）？ 做了一个精馏塔的模拟，设计规定目标定了3个变量，操纵变量设定了2个，调了总是有警告，不知道是不是2个变量数要一样多？高手赐教另补充一个问题，我设置操纵变量的时候，想要设置3个操纵变量来满足3个目标变量，但是在输入操纵变量的时候提示，只有在setup-configuraion中设定的变量才可以作为操纵变量。但是找了下可以设置为操纵变量的选择列表，没有发现其他已经在configuration里设置过的可以变动的变量。 如何解决 模拟见附件 模拟数据及过程描述如下 1 feed rate = 4000 kg/h at bubble point 2 feed composition (mass %) methanol 1.65 acetaldehyde 2.21 methyl formate 3.77 ethanol 1.06 acetone 13.11 methyl acetate 2.34 methyl ethyl ketone 0.57 ethyl acetate 0.25 diethyl ketone 0.1 water 72.68 acetic acid 1.75 formic acid 0.37 propionic acid 0.14 3 separation targets (mass %) distillate: water 10% bottoms: acetone 0.22%, methanol 2%, acidity 3% （ acidity is the sum of the mass fraction of the acids i.e. acetic acid, formic acid and propionic acid in the bottoms. ） 4 no. of trays = 35 5 column diameter = 0.738 m 6 feed tray = 16 7 steam tray = 35 7 steam conditions temperature = 141 ° c pressure = 375 kpa 8 column head pressure = 100 kpa 9 design temperature = 1 15 ° c 10 design pressure = 190 kpa process description the unit under discussion is part of a hydro carbon recovery plant, which removes hydrocarbons and other solvents from the off-gases. water, ace-tone, methanol, and acetic acid are the main components of the feed stream. the product stream (ace-tone rich) is separated from the effluent by using live steam injection. the column has a diameter of 0.728m and consists of 35 trays. the live steam is entered at stage 35 at temperature 141 ° c and 375 kpa pressures. the feed, which is at its bubble point, is entered at stage 16 (the stages are numbered from top to bot-tom) with a column head pressure of 100 kpa. the separation targets (mass %) are distillate: water 10%; bottoms: acetone 2000 ppm; methanol 2%;acidity 3%, where acidity is the sum of the mass fraction of the acids, that is, acetic acid, formic acid, and propionic acid in the bottoms stream. the feed rate is about 4000 kg/h. the temperature at stage 24 is controlled via modification of the steam rate. the design temperature of the column is 115 ° c and design pressure is 190 kpa. 查看更多
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