Template:Separ Table
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The page allows the user to specify the split between the Underflow and Overflow streams.
| Tag (Long/Short) | Input / Calc | Description/Calculated Variables / Options |
| Requirements | ||
| SplitMethod | Mass Fraction | The users may specify the mass fraction split between the Underflow and Overflow streams. |
| Mass Flow | The user may specify the mass flow to either the Underflow or Overflow stream - either as total flow or on a phase basis. | |
| Volume Fraction | The users may specify the volumetric fraction split between the Underflow and Overflow streams. | |
| Volume Flow | The user may specify the Volume flow to either the Underflow or Overflow stream - either as total flow or on a phase basis. | |
| Solid Separation | The user may specify the solid split between the Underflow and Overflow streams. | |
| Each of the above Split Methods will be described separately below: | ||
Mass FractionWith this method the user can specify the mass fraction to either the Underflow or the Overflow on a total or by phase basis. | ||
| SplitTo | Underflow | The user specifies the mass fraction split to the Underflow stream. |
| Overflow | The user specifies the mass fraction split to the Overflow stream. | |
| SplitBy | Total | The user specifies the total mass fraction split to the defined stream. |
| Phase | The user specifies the solid and liquid mass fraction splits to the defined stream. | |
| FracToUF or FracToOF | Input | This is visible if SplitBy = Total. The user sets the total mass fraction split to the defined stream. |
| SolidsToUF or SolidsToOF | Input | This is visible if SplitBy = Phase. The user sets the solid mass fraction split to the defined stream. |
| LiquidsToUF or LiquidsToOF | Input | This is visible if SplitBy = Phase. The user sets the liquid mass fraction split to the defined stream. |
Mass FlowWith this method the user can specify the mass flow to either the Underflow or the Overflow on a total or by phase basis. | ||
| SplitTo | Underflow | The user specifies the mass flow to the Underflow stream. |
| Overflow | The user specifies the mass flow to the Overflow stream. | |
| SplitBy | Total | The user specifies the total mass flow to the defined stream. |
| Phase | The user specifies the solid mass flow and the liquid mass flow to the defined stream. | |
| UF or OF.MassFlowReqd / UF or OF.QmReqd |
Input | This is visible if SplitBy = Total. The user sets the total mass flow to the defined stream. |
| UF or OF.SolidMassFlowReqd / UF or OF.SolidQmReqd |
Input | This is visible if SplitBy = Phase. The user sets the solid mass flow to the defined stream. |
| UF or OF.LiquidMassFlowReqd / UF or OF.LiquidQmReqd |
Input | This is visible if SplitBy = Phase. The user sets the liquid mass flow to the defined stream. |
Volume FractionWith this method the user can specify the volume fraction to either the Underflow or the Overflow on a total or by phase basis. | ||
| SplitTo | Underflow | The user specifies the volume fraction split to the Underflow stream. |
| Overflow | The user specifies the volume fraction split to the Overflow stream. | |
| SplitBy | Total | The user specifies the total volume fraction split to the defined stream. |
| Phase | The user specifies the solid and liquid volume fraction splits to the defined stream. | |
| FracToUF or FracToOF | Input | This is visible if SplitBy = Total. The user sets the total volume fraction split to the defined stream. |
| SolidsToUF or SolidsToOF | Input | This is visible if SplitBy = Phase. The user sets the solid volume fraction split to the defined stream. |
| LiquidsToUF or LiquidsToOF | Input | This is visible if SplitBy = Phase. The user sets the liquid volume fraction split to the defined stream. |
Volume FlowWith this method the user can specify the volume flow to either the Underflow or the Overflow on a total or by phase basis. | ||
| SplitTo | Underflow | The user specifies the volume flow to the Underflow stream. |
| Overflow | The user specifies the volume flow to the Overflow stream. | |
| SplitBy | Total | The user specifies the total volume flow to the defined stream. |
| Phase | The user specifies the solid Volume flow and the liquid volume flow to the defined stream. | |
| UF or OF.VolFlowReqd / UF or OF .QvReqd |
Input | This is visible if SplitBy = Total. The user sets the total volume flow to the defined stream. |
| UF or OF.SolVolFlowReqd / UF or OF.SolidQvReqd |
Input | This is visible if SplitBy = Phase. The user sets the solid volume flow to the defined stream. |
| UF or OF.LiqVolFlowReqd / UF or OF.LiquidQvReqd |
Input | This is visible if SplitBy = Phase. The user sets the liquid volume flow to the defined stream. |
Solid SeparationWith this method the user can choose between setting the solids composition of the Overflow stream or defining the Underflow flowrate and then specifying the solids composition of the Underflow. | ||
| SolidsSeparMethod | OF Solids Fraction | The user specifies the solids mass fraction in the Overflow stream. |
| OF Solids Conc | The user specifies the solids concentration in the Overflow stream. | |
| OF Solids Conc25 | The user specifies the solids concentration at 25°C in the Overflow stream. | |
| Recovery to UF | The user specifies the solids recovery to the Underflow stream, i.e. how much of the solids in the unit reports to the Underflow stream. | |
| UF MassFlow | The user specifies the total mass flow of the Underflow stream. | |
| UF VolumeFlow | The user specifies the total volume flow of the Underflow stream. | |
| Solids Density | Each solid species is split between the Overflow and Underflow streams based on the user specified SolidsCutDensity. | |
| Solids PSD | The user then specifies one of the Solid Methods for defining a partition curve which then separates the solids based on PSD data in the feed. | |
| OFSolidsPriority | Tick Box | New for Build 139.321691. This is visible if SolidsSeparMethod = OF Solids Fraction, OF Solids Conc or OF Solids Conc25. If feed conditions are such that neither OF or UF solids targets can be met, then this determines which stream any solids are sent too. For some flowsheet arrangements (recycles), this can help project convergence reach required OF setpoints and solids flow. |
| OFSolidFracReqd | Input | This is visible if SolidsSeparMethod = OF Solids Fraction. The user sets the solids mass fraction in the Overflow stream. |
| OFSolidConcReqd | Input | This is visible if SolidsSeparMethod = OF Solids Conc. The user sets the solids concentration in the Overflow stream. |
| OFSolidConc25Reqd | Input | This is visible if SolidsSeparMethod = OF Solids Conc25. The user sets the solids concentration at 25°C in the Overflow stream. |
| SolidsToUFReqd | Input | This is visible if SolidsSeparMethod = Recovery to UF. The user sets the mass fraction of solids in the unit that must report to the Underflow stream. |
| UFQmReqd | Input | This is visible if SolidsSeparMethod = UF MassFlow. The user sets the total mass flow of the Underflow stream. |
| UFQvReqd | Input | This is visible if SolidsSeparMethod = UF VolumeFlow. The user sets the total volume flow of the Underflow stream. |
| CutDensityMethod | This is visible if SolidsSeparMethod = Solids Density. | |
| Simple | If the density of a solid species is greater than the SolidsCutDensity then it is all sent to the Underflow stream, otherwise it is all sent to the Overflow stream. | |
| Erf | An error function is used to determine the split of each solid species between the Overflow and Underflow streams based on the species density, SolidsCutDensity and alpha. | |
| Logistic | This method is based on a Logisitic type of function. It is used to determine the split of each solid species between the Overflow and Underflow streams based on the species density, SolidsCutDensity and alpha. | |
| SolidsCutDensity | Input | This is visible if SolidsSeparMethod = Solids Density. The user sets the solids cut density which is used to determine how much of each solid species to send to the Overflow and Underflow streams. |
| ErfAlpha | Input | This is visible if SolidsSeparMethod = Solids Density and CutDensityMethod = Erf. User specified efficiency parameter, alpha. See Erf Cut Density Method for more information. |
| LogisticAlpha | Input | This is visible if SolidsSeparMethod = Solids Density and CutDensityMethod = Logistic. User specified efficiency parameter, alpha. See Logistic Cut Density Method for more information. |
| SolidsBypassToUF | Input | This is visible if SolidsSeparMethod = Solids Density. The fraction of solids which bypasses the separation by density calculations and passes straight to the underflow. |
| The following Solids Method (with Solids PSD) assumes the Solid-Liquid separator is used to emulate the screen. | ||
| Solid Separation Requirements. | ||
| SolidMethod | Simple (no PSD) | The feed does not need size distribution for this method and the unit acts as a simple mass splitter. If the user chooses this mode then they must define the solids and liquids split from the unit. (This option is visible for the Screen 2 model only) |
| Partition Curve | The user inputs a Partition curve (fraction of feed solids per size interval reporting to the oversize) on the PartCrv(deck number) tab. The screen will use this curve, so the size distribution in the feed to the screen has no effect on products. Note: A single partition curve is used for all the size distributions. | |
| Whiten | The screen model will calculate the solids split using the Whiten method. The user must specify the d50 and alpha, a measure of the sharpness of separation. | |
| Karra | The screen model will calculate the solids split using the Karra method. The user may specify either the d50 or the Screen area and Cut aperture. | |
| Rosin-Rammler | This method is based on a Rosin-Rammler type of function with the efficiency curve expression derived by Reid and Plitt. User must specify d50, sharpness of separation, maximum size allowed to undersize and minimum percent of solids reporting to oversize. | |
| Lynch | This method is based on a Lynch type of function. User must specify d50, sharpness of separation (m), maximum size allowed to undersize and minimum percent of solids reporting to oversize. | |
| DelVillar-Finch | This method is similar to Rosin-Rammler, but includes a term for the "fish hook" effect for entrainment. | |
Solid Method - Whiten | ||
| Whiten.CalcMethod | d50 | The user specifies the d50 of the screen. |
| d50 with Beta | The user specifies the d50 of the screen and uses the Beta method to adjust for uncertainties in the finer fractions. | |
| Aperture, Eff | The user specifies the Screen Aperture and Efficiency. The unit then calculates the d50 of the Screen deck. | |
| Aperture, Eff with Beta | The user specifies the Screen Aperture and Efficiency and uses the Beta method to adjust for uncertainties in the finer fractions. The unit then calculates the d50 of the Screen deck. | |
| Whiten.Aperture | Input | Only visible if one of the two Aperture CalcMethods are chosen. The Screen Aperture, used to calculate the d50. |
| Whiten.Efficiency / Eff | Input | The Whiten Efficiency of the Screen.
|
| Whiten.d50 | Input/Calc | If either of the d50 methods are chosen, this is entered by the user. If the Aperture method is chosen, this is a calculated value. This is the particle size with a 50% probability of reporting to the over or under size. |
| Whiten.Alpha | Input | The Efficiency parameter, alpha. An alpha value of between 8 and 15 is normal for screening. However, this does depend on the screening conditions and hence experience and/or test or plant data is required for accurate results. |
| Whiten.Beta | Input | Only visible if the d50 with Beta or Aperture,Eff with Beta CalcMethods are chosen. The Beta Efficiency parameter. This value takes into account uncertainties in the finer size fractions. |
| Whiten.Beta* | Calc | Only visible if the d50 with Beta or Aperture,Eff with Beta CalcMethods are chosen. Efficiency parameter. |
| Whiten.MaxSizeToUS | Input | The model will ensure that all particles LARGER than this size all report to the Screen deck oversize product. This value is often = Screen Deck Aperture. (See Model Theory). |
| Whiten.MinToOS | Input | The model will ensure that a minimum fraction of solids in each size distribution reports to the oversize product. For example, if the user specifies a minimum of 5%, then at least 5% of each size distribution will report to oversize. (See Model Theory). |
| Whiten.Rf | Input | The proportion of feed liquid reporting to the over size product to be used in the fines calculation. Note: This value is only used to adjust the solids fine fraction to the screen oversize and NOT to set the fraction of liquid reporting to the oversize stream. |
|
If the user has selected SolidMethod=Whiten and Whiten.CalcMethod = d50 or d50 with Beta, the following fields will be visible: | ||
|
Theoretical Nominal Screen Aperture | ||
| Whiten.Efficiency / Eff | Input | The Whiten Efficiency of the Screen. Used to calculate the Screen aperture. |
| Whiten.TheorAperture | Calc | The calculated screen aperture, based on the specified d50, alpha and efficiency. Refer to equation 2 in Whiten Method. |
Solid Method - Karra | ||
| Karra.CalcMethod | d50 | The user specifies the d50 of the screen. |
| Area | The user specifies the Area and Cut aperture of the screen and the model calculates the d50 of the screen. | |
| Karra.d50 | Input | Only visible if CalcMethod=d50. The user specified d50 of the screen. |
| Karra.TotalArea | Input | Only visible if CalcMethod=Area. The deck area. |
| Karra.Aperture | Input | Only visible if CalcMethod=Area. The deck cut aperture. |
| Karra.Wet | Tick Box | Only visible if CalcMethod=Area. This must be ticked if this is a wet screening application. |
| Karra.Factor | Input | Only visible if CalcMethod=Area. This is a tuning factor that may be used to adjust the calculated d50 of the screen deck. The default value is 1. |
| Karra.MaxSizeToUS | Input | The model will ensure that all particles LARGER than this size all report to the Screen deck oversize product. This value is often = Screen Deck Aperture. (See Model Theory). |
| Karra.MinToOS | Input | The model will ensure that a minimum fraction of solids in each size distribution reports to the oversize product. For example, if the user specifies a minimum of 5%, then at least 5% of each size distribution will report to oversize. This accounts for fines adhering to coarse particles or fines in the liquid. |
| Karra.Calc_d50 | Calc | Only visible if CalcMethod=Area. The calculated d50 of the deck, using the Karra equations. |
| Karra.d50 | Calc | Only visible if CalcMethod=Area. The d50 that is used to determine the screen partition curve. This is normally equal to the field above. But, if the calculated d50 > screen deck aperture, then the model will use the screen deck aperture. |
| Karra.FeedOversize | Calc | Only visible if CalcMethod=Area. The fraction of oversize material (Q) in the Feed to the deck. |
| Karra.FeedHalfsize | Calc | Only visible if CalcMethod=Area. The fraction of half size material (R) in the Feed to the deck. |
| Karra.FeedNearsize | Calc | Only visible if CalcMethod=Area. The fraction of near size material (Xn) in the Feed to the deck. |
| Karra.SolQmPerArea | Calc | Only visible if CalcMethod=Area. The calculated solids flow rate divided by the screen area. |
Solid Method - Rosin-Rammler | ||
| RR.d50 | Input | The user specifies the d50 of the screen, the size which divides equally between oversize and undersize. |
| RR.Sharpness | Input | The user specifies the sharpness factor for separation, high values for sharper separation |
| RR.MaxSizeToUS | Input | The maximum size allowed to report to undersize. |
| RR.MinToOS | Input | The minimum percent solids (from feed) to report to oversize. |
Solid Method - Lynch | ||
| Lynch.d50 | Input | The user specifies the d50 of the screen, the size which divides equally between oversize and undersize. |
| Lynch.Sharpness (m) | Input | The user specifies the sharpness factor for separation, high values for sharper separation. |
| Lynch.Alpha | Calc | Calculated from the Sharpness (m), refer to Lynch Method for more information. |
| Lynch.MaxSizeToUS | Input | The maximum size allowed to report to undersize. |
| Lynch.MinToOS | Input | The minimum percent solids (from feed) to report to oversize. |
Solid Method - DelVillar-Finch | ||
| Finch.d50 | Input | The user specifies the d50 of the screen, the size which divides equally between oversize and undersize. |
| Finch.Sharpness | Input | The user specifies the sharpness factor (m) for separation, high values of m for sharper separation |
| Finch.d0 | Input | The largest particle size affected by the fish-hook for entrainment function. |
| Finch.MaxSizeToUS | Input | The maximum size allowed to report to undersize. |
| Finch.MinToOS | Input | The minimum percent solids (from feed) to report to oversize. |
| Finch.Rf | Input | Proportion of feed liquid reporting to the over size product. |
| UnderFlow (or Oversize Material when using PSD) Requirements | ||
| UFSolidsMethod | UF Solids Fraction | The user specifies the solids mass fraction in the Underflow stream. |
| UF Solids Conc | The user specifies the Solids concentration in the Underflow stream. | |
| UF Solids Conc25 | The user specifies the Solids concentration in the Underflow stream at 25°C. | |
| UF Density | The user specifies the density of the Underflow stream. | |
| UFSolidFracReqd | Input | This is visible if UFSolidsMethod = UF Solids Fraction. The user sets the solids mass fraction in the Underflow stream. |
| UFSolidConcReqd | Input | This is visible if UFSolidsMethod = UF Solids Conc. The user sets the solids concentration in the Underflow stream. |
| UFSolidConc25Reqd | Input | This is visible if UFSolidsMethod = UF Solids Conc25. The user sets the solids concentration at 25°C in the Underflow stream. |
| UFRhoReqd | Input | This is visible if UFSolidsMethod = UF Density. The user sets the density of the Underflow stream. |
Selected Solid Species Calculation MethodWith this method the user may specify fractions of any number of solid species to bypass to either the Underflow or Overflow streams, or the user may specify the bypass to both Over and Under flow streams. Please see the examples in Model Theory. | ||
| Method | None | There is no overriding of solid species to the Underflow or Overflow streams. |
| Bypass to Underflow | The user may specify the fractions of one or more Solid species that bypass to the Underflow stream. | |
| Bypass to Overflow | The user may specify the fractions of one or more Solid species that bypass to the Overflow stream. | |
| Bypass to Both | The user may specify the fractions of one or more Solid species that bypass the Solid-Liquid calculation block and is then split between the Over and Under flow streams. | |
| BypassSeparCalcs | Tick Box | If this is enabled then the unit will NOT include the bypassed species fraction in the solid/liquid separation calculations. If it is not ticked, then the unit will include the fraction of bypassed species in the solid/liquid separation calculations. Please see the examples in Model Theory for clarification. |
| ShowByPassSolids | Tick Box | If this is enabled then the Count and Speciesx fields will be shown, otherwise they will be hidden. |
| Count | Input | Only visible if ShowByPassSolids is enabled. The number of solid species for which the user wishes to configure bypasses. This may be up to 10 species. |
| Solids Species Overall Bypass to Underflow, Overflow or Both | ||
| Speciesx | Species List | Only visible if ShowByPassSolids is enabled. The user may select a species from a drop down list of all of the Solid species in the project. |
| BypassFracx | Input | The user sets that fraction of species x that must bypass to the Underflow or Overflow streams OR that must bypass Both. Example 1: The user chooses Bypass to Overflow, with Count = 1, Species1 = B(s) and BypassFrac1 = 10%, then 10% of B(s) will bypass the solids separation step and will report to the Overflow stream. 90% of B(s) will be involved in the solid-liquid calculation. Example 2: The user chooses Bypass to Both, with Count = 1, Species1 = B(s), BypassFrac1 = 100% and FracToOF1 = 10%. ALL of B(s) will bypass the solids separation step, 10% of B(s) and will report to the Overflow stream and the remaining 90% will report to the Underflow stream. |
| FracToOFx | Input | This field is only visible if the user selects Bypass to Both. The user sets that fraction of species x that must bypass to the Overflow streams. For example: The user chooses Bypass to Both, with Count = 1, Species1 = C(s), FracToOf1 = 100% and FracToOF1 = 50%. ALL of the C(s) will bypass the solids separation step, 50% of C(s) and will report to the Overflow stream and 50% will report to the Underflow stream. |
Results | ||
| Temperature / T | Display | The temperature of mixture in the solid liquid separator. |
| MassFlow / Qm | Display | The total mass flow to the Underflow and Overflow streams. |
| VapourMassFlow / VQm | Display | The total flow of vapour to the Underflow and Overflow streams. (This does NOT include the vapour to the Vent) |
| UF.BypassMassFlow / UF.BypassQm | Display | The mass flow of the material that bypasses the underflow. |
| OF.BypassMassFlow / OF.BypassQm | Display | The mass flow of the material that bypasses the overflow. |
| BypassMassFlow / BypassQm | Display | The mass flow of the solids in the unit that bypasses the separation section. |
| UF.SolidsTakeoffQm | Display | Only visible for Classifying Precipitator. The solids mass flow takeoff from the underflow for recycle. |
| UF.SolidsTakeoffFrac | Display | Only visible for Classifying Precipitator. The mass fraction of solids in the underflow that reports to takeoff for recycle. |
| UF.FinalSf | Display | Only visible for Classifying Precipitator. The final underflow solids mass fraction after removal of solids takeoff. |
Slurry Separation ResultsIf the BypassSeparCalcs tickbox is selected (visible with Solid Species Bypass Calculation Method used), then the table heading will display "Slurry Separation Results (excluding bypass)" | ||
| UFSolidsRecovery | Display | The fraction of feed solids sent to the underflow. |
| UFLiquidRecovery | Display | The fraction of feed liquid sent to the underflow. |
| The following table displays the flows and compositions of the Underflow and Overflow streams. Note: These are for slurry only, vapours are excluded. | ||
| MassFlow / Qm | Display | The total mass flow in each of the Underflow and Overflow streams. |
| VolFlow / Qv | Display | The total volume flow in each of the Underflow and Overflow streams. |
| SolidMassFlow / SQm | Display | The solids mass flow in each of the Underflow and Overflow streams. |
| LiquidMassFlow / LQm | Display | The liquid mass flow in each of the Underflow and Overflow streams. |
| SolidFrac / Sf | Display | The solid fraction in each of the Underflow and Overflow streams. |
| Density / Rho | Display | The total density of each of the Underflow and Overflow streams. |
| SolidConc | Display | The solid concentration (mass of solids/density of slurry) in each of the Underflow and Overflow streams. |
| SolidConc25 | Display | The solid concentration at 25°C (mass of solids/density of slurry at 25°C) in each of the Underflow and Overflow streams. |
