ASPEN中冷凝器的选择问题？ aspen plus v7.1帮助文件解释 lets you select the condenser type for the column. the condenser types are: condenser type description total： total condenser with liquid distillate at its bubble point partial vapor： partial condenser with vapor distillate only partial vapor-liquid： partial condenser with both vapor and liquid distillates you can also choose to have no condenser. 我有几幅图，很直观，但还没找到，找到发上来。 pro/ii version 8.3帮助文件 condenser types the condenser is always considered to be a heat sink on tray one. several options are provided for the condenser product(s) as described below. note that condenser products correspond to products from the accumulator drum. for most columns there is a small pressure drop from the top tray of the column (tray two) to the accumulator drum. partial partial condensers correspond to an equilibrium stage, with both equilibrium liquid and vapor produced from the accumulator drum. equilibrium liquid is always returned to tray two of the column model as reflux. the condenser may or may not have a liquid product withdrawn from the accumulator drum. a "fixed rate liquid draw" from tray one is used to represent the liquid product when both liquid and vapor products are desired for a partial condenser. the equilibrium vapor product is always defined as the column "overhead" product. the condenser temperature is calculated, and must correspond to the dew point of the column overhead vapor product. when a "fixed rate liquid draw" is used to represent a liquid product, inconsistencies can arise if the draw rate is not reasonable. to avoid such problems it is recommended that the condenser temperature be specified and the draw rate be calculated as a column variable. see [url=mk msitstore:c:\simsci\proii83\hlp\p2help.chm::/idh_column_specifications_and_v.htm] column specifications and variables [/url] for further information. bubble temperature the condenser temperature is computed such that the column top tray vapor (tray 2) is cooled to a bubble point liquid phase. some liquid is returned to the column as reflux and some is withdrawn as product. the condenser liquid product is defined as the column "overhead" product. subcooled, fixed temperature for this option the column top tray vapor (tray 2) is cooled below its bubble point or "subcooled". you must provide a value for the subcooled temperature. note that for this option the condenser does not function as a theoretical tray, however it is still defined as tray number one for column set-up purposes. the subcooled liquid product is defined as the column "overhead" product. pro/ii checks the condenser product to ascertain that it is truly a subcooled liquid at the defined temperature and pressure. if the product is not subcooled, the bubble point temperature is given in a message and a non-converged condition is flagged. it is your responsibility to revise the temperature or change the condenser type, as is appropriate. the advantage of this condenser option is that a condenser temperature may be defined without using a column performance specification. subcooled, fixed temperature drop this condenser type is identical to the subcooled type described above except that the number of degrees of subcooling below the bubble point is provided instead of the subcooled temperature. for this case the liquid product bubble point is computed at the condenser pressure. the temperature is then reduced by the specified temperature drop for the reflux and liquid product. 查看更多
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