aspen plus流股分离？ 看看下面的帮助文档吧！ for material streams: use this sheet to specify split specifications and key component numbers. for each outlet stream except one, you must give one specification. any remaining flow is placed in the unspecified outlet stream to satisfy material balance. the composition, temperature, pressure, and other stream variables for all outlet streams are the same as those for the mixed inlet streams. only the total flow rates differ. note: specifications are processed in the order specified in the stream order column, if you specify it. this is important if you make any residual fraction specifications, or if the actual flow is inadequate to satisfy the specifications. see specifying fsplit for details. to split material streams, give one of the following specifications for each outlet stream except one: fraction of the combined inlet flow flow rate (on a mole, mass, or standard liquid volume basis) for the entire stream, or for a subset of key components in the stream actual volume flow rate limit or cumulative limit flow rate (on a mole, mass, or standard liquid volume basis, or actual volume flow) fraction of the residue remaining after other specifications are satisfied to split heat streams or work streams, specify one of the following for each outlet stream except one: fraction of the combined inlet heat or work power or duty value for the stream fsplit puts any remaining flow, heat, or work in the unspecified outlet stream to satisfy the material or energy balance. material flow rate specifications can be made on a normal basis, as a limit flow, or as a cumulative limit flow. when you specify normal flow rates and/or split fractions, if there is insufficient flow in the inlet stream to meet the specifications, and you did not specify stream order, the calculated split fractions are normalized, and a warning will be issued. each stream with a specification will receive flow, but less than what was specified; all flows are divided by the same factor to satisfy the mass balance. this also applies when there is insufficient work or heat for power or duty specifications. when you specify limit flows, outlet streams are assigned flow in the priority specified in the stream order field. the stream with highest priority ( stream order = 1) is filled first, up to the specified limit. if there is enough flow in the inlet, then the second priority stream will be filled, and so on. if there is inadequate flow to meet all specifications, then some outlet streams will be empty and the last priority stream to receive flow may receive less than the limit. cumulative limit flows are similar to limit flows, but the value specified is the total amount of flow assigned to this stream and the ones before it in the stream order . for example, if you assign stream s1 a limit flow of 50 and stream order 1, and stream s2 a cumulative limit flow of 75 and stream order 2, then stream s2 will receive a flow rate of 25 (if there is sufficient flow in the inlet stream). if you specify a residual fraction, the flows are processed in stream order and the specified fraction of the remaining inlet flow (after earlier streams have been assigned flow) is given to the stream with the residual fraction specification. if you do not specify stream order with limit flows, cumulative limit flows, and/or residual fractions, then the normal flows and split fractions are processed first (normalized if necessary), then the limit flows and specified limit flows are processed, and the residual fractions are processed last. note: if you make limit flow and/or split fraction specifications, and you specify stream order , the specifications are processed according to the stream order . normal flows and split fractions will be converted to limit flow specifications if the flow is inadequate, and a warning will be issued. 查看更多
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