Operations guide47
- 1. Streams 3-7 3-7 Depending on which of the state variables are known, HYSYS automatically performs the correct flash calculation. Once a stream has flashed, all other properties about the stream are calculated as well. You can examine these properties through the additional pages of the property view. Notice a flowrate is required to calculate the Heat Flow. The stream parameters can be specified on the Conditions page or in the Workbook view. Changes in one area are reflected throughout the flowsheet. While the Workbook displays the bulk conditions of the stream, the Conditions page, Properties page, and Compositions page also show the values for the individual phase conditions. HYSYS can display up to five different phases. • Overall • Vapour • Liquid. If there is only one hydrocarbon liquid phase, that phase is referred to as liquid. • Liquid 1. This phase refers to the lighter liquid phase. • Liquid 2. This phase refers to the heavier liquid phase. • Aqueous. In the absence of an aqueous phase, the heavier hydrocarbon liquid is treated as aqueous. When there is only one aqueous phase, that phase is labelled as aqueous. • Mixed Liquid. This phase combines the Liquid phases of all components in a specified stream, and calculates all liquid phase properties for the resulting fluid. For an electrolyte material stream, HYSYS conducts a simultaneous phase and reaction equilibrium flash on the stream. For the reactions involved in the flash and the model used for the flash calculation, refer to Section 1.6.9 - Electrolyte Stream Flash in the HYSYS Electrolyte OLI manual. The Mixed Liquid phase does not add its composition or molar flow to the stream it is derived from. This phase is only another representation of existing liquid components.