Feeder-Cross Page Connector
This Page is for SysCAD 138 and later. For earlier versions, please see Feeder-Cross Page Connector 137.
- 1 General Description
- 2 Diagram
- 3 Inputs and Outputs
- 4 Model Theory
- 5 Data Sections
- 5.1 Feeder-Cross Page Connector
- 5.2 Feeder Operation Selection
- 5.3 Flow Requirements
- 5.4 Required (Mass or Volume) Flow
- 5.5 Temperature & Pressure Requirements
- 5.6 Qualities
- 5.7 Cross Page Connection
- 5.8 Composition Fetch
- 5.9 EB(Feed Processing)...
- 5.10 Results: Flow Conditions
- 5.11 Options
- 5.12 Batch Feed
- 6 Hints and Comments
- 7 Examples
- 8 Adding this Model to a Project
This unit can function in one of three ways:
- A source of material:
- In this case the user usually sets up the Required Flow from the unit, the Temperature and Pressure AND the species composition, on the Define Species - DSp page;
- The Default species composition in a Feeder is 100% water. Therefore, if the user does NOT change the species composition, the Feeder will deliver water to the project;
- A sink for material, or
- A cross page connector, in which case it would be connected to another Feeder / Cross Page unit, typically on another flowsheet page.
- You may navigate to the connected Feeder by double clicking with the left mouse button on the Feeder.
- In addition, if the Feeder is not connected, but has the Composition Fetch (CF) enabled, then double clicking with the left mouse button on the Feeder will take you to the CF source (often a pipe). This is only available in SysCAD 9.3.
- The image below shows how to connect Feeders (This shows the Access Window for SysCAD 9.3).
- If two units are connected as cross page connectors, as shown in the left hand image above:
- ROM_TO_LEACH_PLANT (operation mode Sink) is connected to ORE_FEED (operation mode Source)
- All the feeder information defined in ORE_FEED is greyed out and will be ignored.
- The down stream link from ORE_FEED will contain exactly the same information as the up stream link of ROM_TO_LEACH_PLANT.
- Any information in the ORE_FEED unit will be maintained and not lost.
- If the cross page connection is disabled, as shown in the right hand image above:
- There is no connection between the ORE_FEED and the ROM_TO_LEACH_PLANT units.
- The input fields in ORE_FEED are white and the user may insert any value, which will be used by the unit.
- The model requires either a single inlet or a single outlet, depending upon its intended use.
- A Sink has no input fields - the user may not set anything in this unit - it accepts whatever is delivered by the upstream link.
- The user may not type any Feed data into a Source until it has been connected to a downstream link.
- A Cross Page Connection can only be established between two Feeder/XPG units.
The lines show the stream connections.
Inputs and Outputs
|Input / Output||No of connections||Description|
|Min Connection||Max Connection|
Used as a material source or sink; OR as a connector between two feeders (usually on separate graphics pages).
The feeder access window may consist of a number of sections. This number may increase or decrease, based on user configuration and / or number of species. Some of these variables are only relevant in the case of a source. When the unit is connected to another cross page connector, the input variables are not used.
- FeederSink - this is the first Tab. The user accesses this tab to configure the basic manner in which the Feeder works, or to connect to a another Feeder.
- Batch Feed - this section is available on the first Tab in Dynamic projects. This allows users to set the Feeder to deliver a fixed amount of flow.
- VLE - Optional tab that is visible if Vapour Liquid Equilibrium is enabled on the first tab. Only visible for selected Feeder Operation modes.
- PC - Optional tab that is visible if that is visible if Feeder Operation = "General" and EB.Solubility.On and/or EB.PhaseChange@T.On is enabled on the first tab.
- MU - Optional tab, or tabs if there is more than one Makeup, that is visible if Feeder Operation = "General" and Makeups > 0.
- Content - In SysCAD 9.3 this tab is only visible if 'ShowContent' is ticked. Contains data on the material from the Feeder and may be spread across one or two Tabs, depending on the project and the selected views. This Tab is not visible if the unit is a Sink.
- DSp - this tab allows the user to define the species (Define Species) in the material from the Feeder. This may be spread across one or two Tabs, depending on the number of species in the project. This Tab is not visible if the unit is a Sink. NOTE also that depending on the Feeder Operation selection, the DSp page may display the Full list or a "Pre-filtered" list of species.
- QFeed - Optional tab that is visible if ShowQFeed is enabled. This and subsequent tab pages, e.g. QFeed.. and Sp, shows the properties of the stream into the unit.
- This is before any Evaluation Block sub-models are evaluated.
- QProd - Optional tab that is visible if ShowQProd is enabled. This and subsequent tab pages, e.g. QProd.. and Sp, shows the properties of the stream out of the unit.
- This is after any Evaluation Block sub-models are evaluated.
- Info tab - contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents.
- Links tab, contains a summary table for all the input and output streams.
- Audit tab - contains summary information required for Mass and Energy balance. See Model Examples for enthalpy calculation Examples.
Feeder-Cross Page Connector
Unit Type: FeederSink - The first tab page in the access window will have this name.
Please note that the layout described below is valid for SysCAD 9.3
The Data section of the cross page connector changes depending on the Operation Mode. Please click on the relevant mode to see the different settings.
|Tag (Long/Short)||Input / Calc / Options||Description|
|Common Data on First Tab Page|
Feeder Operation Selection
|Operation||General||This operation is the same as Build 137, where all the feeder options are available. Composition Fetch, sub-models and full species list are available in the DSp tab.|
|Solids||This operation mode will apply a solids filter to the DSp tab, all species in other phases are forced to zero.. This operation mode does not allow composition Fetch nor sub-models. VLEquilibrium is not available as it does not apply to solids.|
|Liquids||This operation mode will apply a liquids filter to the DSp tab, all species in other phases are forced to zero. This operation mode does not allow composition Fetch nor sub-models. VLEquilibrium selection is limited to Saturated or subcooled liquid.|
|Vapours||This operation mode will apply a vapours filter to the DSp tab, all species in other phases are forced to zero. This operation mode does not allow composition Fetch nor sub-models. VLEquilibrium selection is limited to Saturated or superheated vapour. NOTE: for non saturated conditions please use the General Operation mode.|
|Slurry||This operation mode will apply a solids & liquids filter to the DSp tab, all species in other phases are forced to zero. This operation mode does not allow composition Fetch nor sub-models. VLEquilibrium selection is limited to Saturated or subcooled liquid.|
|Water||This operation mode will apply a water filter to the DSp tab, the only species shown is Water. This operation mode does not allow composition Fetch nor sub-models. VLEquilibrium selection is limited to Saturated or subcooled liquid. NOTE: for non saturated conditions please use the General Operation mode.|
|Steam||This operation mode will apply a Steam filter to the DSp tab, the only species shown is Steam. This operation mode does not allow composition Fetch nor sub-models. VLEquilibrium selection is limited to Saturated or superheated vapour. NOTE: for non saturated conditions please use the General Operation mode.|
|PlantModel Air||This operation will fetch the Global air specification from Plant Model - Environment Tab, Air Composition section into the DSp Tab. In this mode, only the flowrate can be adjusted.|
|Stream Fetch||This operation will allow user to fetch the stream T, P, and composition information from another stream. User must specify the source stream, eg: P_104.Qo OR ROM_STOCKPILE.QFeed. In this mode, only the flowrate can be adjusted. If flow should also be fetched, please tick the FetchFlow tickbox in the Required Mass/Volume Flow section.|
|Content Fetch||This is available for dynamic simulation only. This operation will allow user to fetch the T, P and composition information from another content (such as tank). User must specify the source, eg: Tank1.Content. In this mode, the flowrate can be adjusted.|
|MakeupSrc Fetch||This operation will allow user to fetch the stream information from a Makeup Source. In this mode, only the flowrate can be adjusted. A DirectLink pipe is not created between the feeder and the flow used is NOT reflected in the Makeup source total. The purpose of this operation mode is for the feeder to be a true source of material and to use a Makeup source as a common Composition, T and P template definition.|
|Link to MakeupSrc||This operation will allow user to draw the flow from a Makeup Source, the DirectLink is automatically created similar to a Makeup block. In this mode, only the flowrate can be adjusted. The advantage of this operation mode is that the Makeup source is the source of the material, a DirectLink stream is created and the flow used is reflected in the Makeup source total. Click here to see an example.|
Visible with the Stream Fetch operation. User specified the source stream, eg: P_104.Qo OR ROM_STOCKPILE.QFeed
|MakeupSrc||DropList||Visible with the MakeupSrc Fetch operation. User selects the available makeup source unit from the list.|
|SrcLink... (This group is only visible with Link to MakeupSrc operation mode)|
|MakeupSrc||DropList||Visible with the Link to MakeupSrc operation. User selects the available makeup source unit from the list.|
|DirectLink||Feedback||Lists the name of the direct link (auto added by SysCAD). This auto link can be renamed, the graphics for this autolink can also be adjusted using either 'change symbol' or 'redraw link'.|
|Connect||Feedback||Returns the status of the makeup connection with the makeup source. If the makeup source tag is invalid or empty, an error will be given.|
|Mode||MassFlow (Qm)||Default. The user may set the Mass flow from the feeder.|
|VolumeFlow (Qv)||The user may set the Volume flow from the feeder.|
|NVolumeFlow (NQv)||The user may set the Normalised Volume flow from the feeder.|
|Const Pressure||The user may set the Pressure at the feeder. This option is only available in Dynamic Transfer mode.|
Only available for
Operation - General Mode.
in the Hints and
|All||The flow specified will be the flow of All phases from the Source, i.e. if Flow Required = 10t/h, then a total of 10t/h will flow out of the Source.|
|Solids||The flow specified will be the flow of the Solid phase from the Source, i.e. if Flow Required = 10t/h, then 10t/h of Solids will flow out of the Source. If the user has specified a composition of 90% solids and 10% liquids, then the Total Flow = 10t/h Solids + 1.11t/h Liquids = 11.11t/h.|
|Liquids||The flow specified will be the flow of the Liquid phase from the Source, i.e. if Flow Required = 10t/h, then 10t/h of Liquids will flow out of the Source. If the user has specified a composition of 50% liquids and 50% solids, then the Total Flow = 10t/h Liquids + 10t/h Solids = 20t/h.|
|Vapour||The flow specified will be the flow of the Vapour phase from the Source, i.e. if Flow Required = 10t/h, then 10t/h of Vapours will flow out of the Source. If the user has specified a composition of 20% vapours, 70% liquids and 10% solids, then the Total Flow = 10t/h Vapours, 35t/h Liquids + 5t/h Solids = 50t/h.|
The SpModel.Reqd field is only shown if more than one Species Model is available in the project (eg. Standard and Bayer3).
|SpModel.Reqd||Inherit||Upstream configuration will be used.|
|Standard||All the variables are calculated using the Mass Weighted Mean of the species.|
|Species Model||Use an alternative species model, such as 'Bayer3' or 'Potash'.|
|SpModel.Used||Standard||The Standard species model is being used.|
|Species Model||An alternative species model is being used.|
|SpModelType||Display||This field displays the Species Model type used in the unit.|
|Calculator||TickBox||Only visible if Species Model used is Bayer3 or Potash. Please see Bayer Liquor Calculator or Potash Liquor Calculator|
|Demand.On||TickBox||If this is enabled then the feeder will feed in the required mass as demanded by the connected stream. See Demand.|
If this is not enabled, then the feeder adds the amount of material as specified by the user.
|Demand.Max||Input||The maximum flow allowed from the Feeder in Demand mode. This field is only visible if Demand.On is enabled.|
|When demand.On is in use, the Required Flow (see next group of tags) will become the Demand Minimum (mass/volume) flow. The variable will have text "(Min)" displayed as a reminder.|
Required (Mass or Volume) Flow
This field is not available if the user selects Const Pressure in Dynamic Transfer mode.
|FetchFlow||Tickbox||Visible when Operation = "Stream Fetch". This allows the feeder to fetch Flow rate from the source unit.|
|MassFlowReqd / QmReqd||Input||Visible with MassFlow (Qm) Mode. The mass flow required from the feeder. Note: This will become the minimum flow allowed if Demand.On is enabled.|
|VolFlowReqd / QvReqd||Input||Visible with VolumeFlow (Qv) Mode. The volumetric flow required from the feeder. Note: This is minimum flow allowed if Demand.On is enabled.|
|NVolFlowReqd / NQvReqd||Input||Visible with NVolumeFlow (NQv) Mode. The normalised volumetric flow required from the feeder. Note: This is minimum flow allowed if Demand.On is enabled.|
Temperature & Pressure Requirements
NOTE: The VLE options are only valid for components with VLE information. When one of the VLE options is chosen, the VLE tab will be visible. Some VLE conditions are inherently unachievable: for example you can never have a saturated vapour if there are nonvolatile liquid components present. If you try to set an unachievable condition you will get an error.
|VLEquilibrium||Off||Default. No VLE data is applied. The user can enter values for both P_Reqd and T_Reqd.|
|Saturated_Vap(T)||The Feeder composition will be auto adjusted to saturated VAPOUR conditions at the Temperature in the T_Reqd field.|
|Saturated_Vap(P)||The Feeder composition will be auto adjusted to saturated VAPOUR conditions at the Pressure in the P_Reqd field.|
|SuperHeat_Vap(dT,P)||Only available in Build 137 or later. This allows the Feeder mixture to be at superheated conditions at the Pressure in the P_Reqd field. The temperature will be automatically adjusted to be at the saturated temperature plus SuperHeatReqd.|
|SuperHeat_Vap(T,P)||This allows the Feeder mixture to be at superheated conditions. P_Reqd must be ≤ P_saturated at the specified Temperature (T_Reqd)(SysCAD will auto adjust the pressure if it is greater than the saturated pressure).|
|Saturated_Liq(T)||The Feeder composition will be auto adjusted to saturated LIQUID conditions at the Temperature in the T_Reqd field.|
|Saturated_Liq(P)||The Feeder composition will be auto adjusted to saturated LIQUID conditions at the Pressure in the P_Reqd field.|
|Subcooled_Liq(dT,P)||Only available in Build 137 or later. This allows the Feeder mixture to be at sub-cooled conditions at the Pressure in the P_Reqd field. The temperature will be automatically adjusted to be at the saturated temperature minus SubCoolingReqd.|
|Subcooled_Liq(T,P)||This allows the Feeder mixture to be at sub-cooled conditions. P_Reqd must be ≥ P_saturated at the specified Temperature (T_Reqd) (SysCAD will auto adjust the pressure if it is less than the saturated pressure).|
|Saturated(X,T)||The Feeder composition will be auto adjusted to saturated conditions at the Temperature in the T_Reqd field, with a vapour fraction (steam quality if the volatile component is H2O) of X_Reqd.|
|Saturated(X,P)||The Feeder composition will be auto adjusted to saturated conditions at the Pressure in the P_Reqd field, with a vapour fraction (steam quality if the volatile component is H2O) of X_Reqd.|
|Saturated_Non_Cond(T,P)||The vapour fraction of the volatile component (X_Rqd) will be auto adjusted to saturated conditions at the Temperature in the T_Reqd field and Pressure in the P_Reqd field, when non-condensable gases are present.|
|Relative Humidity||The Feeder must contain gases. If the user selects this option, SysCAD will adjust the amount of H2O(g) to give the required relative humidity in the gas stream. SysCAD will adjust the fractions of the gases in the Feeder other than H2O(g) proportionally.|
Relative Humidity = Partial Pressure of H2O(g) / Saturation Pressure of H2O(g) at Stream Temperature * 100
Please see the YouTube link for a video presentation on using this functionality.
|VapourCalcs||Display||This field is only visible if VLEquilibrium is in use. Shows VLE method and component used.|
|TemperatureReqd / T_Reqd||Input / Calc||The required temperature of the material from the feeder. This value is calculated if one of the Saturated at pressure or dT VLE options are chosen.|
|PressureReqd / P_Reqd||Input / Calc||The required input pressure. This value is not usually required for steady state mass balances. However, for energy balances, especially in the case of steam/water, it is important that the correct pressure is specified. This value is calculated if one of the Saturated at temperature VLE options is chosen.|
|StaticHead||Input||Only visible in Dynamic projects. The static head. This will affect the pressure in the downstream pipe.|
|SuperHeatReqd||Input||This field is only visible if the SuperHeat_Vap(dT,P) VLE option is selected (only available in Build 137 or later). This is the degrees of superheat of the stream (T - Saturation temperature).|
|SubCoolingReqd||Input||This field is only visible if the SubCooled_Liq(dT,P) VLE option is selected (only available in Build 137 or later). This is the degrees of subcooling of the stream (Saturation temperature - T).|
|X_Reqd(VapourFrac)||Input / Calc||This field is only visible if VLEquilibrium is in use. The required vapour fraction (or steam quality if the volatile component is H2O) of the material from the feeder. This value is calculated unless the Saturated(X,T) or Saturated(X,P) VLE option is chosen.|
|RelHumidityReqd||Input||This field is only visible if the RelativeHumidity VLE option is selected. This is the required relative humidity (Partial Pressure of H2O(g) / Saturation Pressure of H2O(g) at Stream Temperature) of the feed.|
|Stream qualities such as "Lockup", "MatTrack - material tracking", "SzSSA - Size using average specific surface area" and "SzDIst - Size distribution" maybe created / removed here. The visibility of this section will depend on user selection and Operation mode selection.
Cross Page Connection
No connection can be made in a Sink unit - the user MUST connect two cross-page connectors via the Source unit (Feed to the flowsheet).
|ConnectionBlocked||Tick Box||Selecting the tickbox on the Sink unit will remove the unit from the "available to connect (ConnectTo)" list. For example, if the Sink is the Product, user may tick this box to avoid accidentally selecting this from the ConnectTo droplist.|
|ConnectionOn||Tick Box||This is used to enable the configured cross page connection. This may only be accessed on a Source, it cannot be changed on a Sink unit.|
|Connection / Conn_To||Input / List||The required Tag Name of the connecting Sink unit. The drop-down list will contain the tags of all un-connected Sinks in the project. The user may also type in the Tag of the required Sink.|
|Connected_To||Display||If ConnectionOn is enabled AND a valid Sink Tag is entered in the Conn_To field, then the connected Sink tag is displayed in this field.
|Connected||Display||Displays the status of the cross page connection - either Yes or '-'.|
|CF.When||Off||No information will be transferred automatically. The user may still manually transfer data from the source by pressing the CF.Fetch button.|
|OnceOff||This mode allows a once off automatic information transfer of information at the next project step (if the project is solving) or when project solve/run is started (if the project is stopped). Once the data has been transferred, it will revert back to the off mode.|
|Continuous||This mode allows continuous automatic information transfer while the project is solving. This is similar to a cross page connector in terms of material flow but the solver will treat the unit operations separately. Therefore, for large projects with difficult to solve recycle streams, this is a great way of breaking up the solver network to improve solve speed.|
|CF.What||Nothing||No information will be fetched.|
|T||Temperature information from the CF.Source unit (specified by the user) will be used.|
|P||Pressure information from the CF.Source unit (specified by the user) will be used.|
|T, P||Temperature and Pressure information from the CF.Source unit (specified by the user) will be used.|
|Comp||Component make up information from the CF.Source unit (specified by the user) will be used.|
|T, Comp||Temperature and Component make up information from the CF.Source unit (specified by the user) will be used.|
|P, Comp||Pressure and Component make up information from the CF.Source unit (specified by the user) will be used.|
|T, P, Comp||Temperature, Pressure and Component make up information from the CF.Source unit (specified by the user) will be used.|
|Flow||Flowrate information from the CF.Source unit (specified by the user) will be used.|
|T, Flow||Temperature and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|P, Flow||Pressure and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|T, P, Flow||Temperature, Pressure and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|Comp, Flow||Components make up and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|T, Comp, Flow||Temperature, Components make up and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|P, Comp, Flow||Pressure, Component make up and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|T, P, Comp, Flow||Temperature, Pressure, Component make up and Flowrate information from the CF.Source unit (specified by the user) will be used.|
|CF.Ratio||Input||This allows the user to set a ratio of the feeder flow to the source flow. So, for example, if the ratio = 1 (default value, and most commonly used setting) then the flow from the feeder will be equal to the flow in the source. If the ratio is set to 2, then the feeder flow will be twice that from the source.|
|CF.Source||Input||The default is (Self.flows). This option will work if the following sequence of events has taken place. 1) The feeder is connected to another unit via the cross page connector method; 2) the flowsheet has been solved with the connection on. If the above are true, then the feeder will temporarily carry solved flow information. The user can then elect to copy an image of this data and set them as the feeder information by fetching the self flows data.
If the user wants to get information from other unit operations, then the format is:
[Unit Operation Tag Name].[Tab Page Name]
Examples: XPG_1.QProd, P_1.Qo, X_1.QProd, TNK_1.QFeed
|CF.WarnOnZeroSrc||TickBox||If this is enabled then the user will receive a warning if the flow in the source is zero (or if the surge content is zero in a dynamic project)|
|CF.What.Quality||TickBox||Different tick boxes will be visible, depending on the options enabled in the project. Possible options include: LockUp, Size data and so on. See Qualities Models for more information.|
The project in the example shown below has Size Distribution enabled, and therefore the user may also fetch the size data from the stream in the composition fetch:
|CF.Fetch||Button||The required information is fetched from the CF.Source unit operation and used to set the current feeder configuration.|
NOTE: This section is only visible for the Operation - General Mode only. For other operation modes, EB sub models are either NOT available or available in a simplified form (eg Makeup).
|Solubility.On||Tickbox||Allows the user to switch on any predefined solubility curve to adjust the composition of material in the feeder.|
|PhaseChange@T.On||Tickbox||Only visible if Phase Change at Temperature has been defined for at least one species in the project. Allows the user to switch on any predefined phase changes at temperature in the feeder.|
|EvalSequence||Display||The sequence in which the sub models (which are part of the evaluation blocks) will be calculated. The sequence is determined by the priority selection for the individual sub-models.|
|Makeups||Input||The number of makeup blocks required. Extra dropdown options Makeup1, Makeup2, etc will be added to allow these to be switched on and off and prioritised in relation to the other sub-models.|
|MakeupX||List||This can be used to switch the Makeup Block (MU) on or off and prioritise it in relation to the other sub-models. If this is 'On' then the associated page, MUX becomes visible and may be configured. |
Note: This field is only visible if the entry for 'Makeups' is greater then 0. If there is one makeup then X=1. If there are two makeups, then X=1 and X=2, etc.
Results: Flow Conditions
|State||Display||Displays the state of the unit. Options are: Feeder, Sink, Feeder-Connected, Sink-Connected.|
|MassFlow / Qm||Display||The mass flow into or out of the unit.|
|VolFlow / Qv||Display||The volume flow into or out of the unit.|
|NVolFlow / NQv||Display||The normalised volume flow into or out of the unit.|
|Temperature / T||Display||The Temperature of the material flowing into or out of the unit.|
|Density / Rho||Display||The density of the material flowing into or out of the unit.|
|NDensity / NRho||Display||The normalised density of the material flowing into or out of the unit.|
|Pressure / P||Display||The pressure of the unit.|
|PasteData||Button||Allows the user to paste data copied from a stream (using the 'CopyToClipboard' button). The stream may be in the current SysCAD project, or another project. Only available in SysCAD 9.3.|
See How do I copy Stream data to a Feeder?
|ShowContent||Tickbox||Allows the user to view the Content tab of the Feeder. Only available in SysCAD 9.3.|
|ShowQFeed||Tickbox||Allows the user to view the Feed tab of the Feeder. This is the flow from the Feeder unit, either via the Cross Page Connection or as set by the user, but prior to any Makeups.|
|ShowQProd||Tickbox||Allows the user to view the Product tab of the Feeder. This is the actual flow from the Feeder unit, including any Makeups.|
This functionality allows the user to allow the Feeder to deliver a discrete batch to the project. This section is only available in Dynamic Transfer mode.
|Symbol / Tag||Input / Calc||Description|
|BatchMethod||None||The Batch functionality is not enabled.|
|Total Mass||The Batch functionality is enabled and the required batch size is defined in terms of Mass flow. Further fields will become visible if this option is selected allowing the user to set the required batch mass.|
|The following fields will be visible if Total Mass is selected as the Batch method.|
|M.BatchAddition||Input||The Mass of the required Batch. This amount of material will be delivered by the Feeder at the rate specified in Qm.Capacity or Qv.Capacity.|
When this value is set the amount of material will be added to the amount of material already in BatchRemaining (the field below), and then this field will revert to 0.
|M.BatchRemaining||Calc / Input||The Mass of material currently in a Batch, i.e. the amount of material in a Batch that still has to be delivered by the Feeder. Normally this value is initialised at the start of a run and then it is calculated by SysCAD from the amount required in M.BatchAddition and the amount already delivered by the Feeder. |
However, the user may set this value and hence override the calculated Batch amount at any stage.
If the users sets this as Undefined (or '*') this is equivalent to any infinite Batch and therefore the flow from the Feeder will not be restricted.
|M.BatchTotal||Display||The Total Mass that has flowed from the Feeder using the Batch addition method.|
|BatchState||None||No Batch mode has been set.|
|Inactive||A Batch method has been selected, but the Batch is undefined.|
|Busy||A Batch method has been selected, there is material remaining in the Batch, and hence there is flow from the Feeder due to the Batch.|
|Stop Flow||A Batch method has been selected, there is NO material remaining in the Batch, and hence there is no flow from the Feeder, i.e. The Batch will prevent the Feeder from discharging any material.|
|BatchUsePreset||Tickbox||This enables the use Preset for the Batch amount.|
|M.BatchUsePreset||Input||The Mass of the Batch when the model is Preset. Refer to Preset for more information.|
Hints and Comments
- The configuration options for the feeder will be based on Operation mode selected.
- CF and EB groups are only visible for the General Operation mode.
- VLE options will be shortened or not visible for selected modes.
- The DSp tab species list will also be shortened for selected modes.
- The Link to MakeupSrc and Demand.on can be used at the same time, allowing the use of both Makeup and Demand in the same unit.
- The default Mode of the Feeder is MassFlow (Qm). The Const Pressure is only visible in dynamic simulations. The valid modes for Steady State are MassFlow (Qm), VolumeFlow (Qv) or NVolumeFlow (NQv)
- The default for FlowBasis is 'All'. See below for an example of the use of the other FlowBasis options.
- Depending on the method selected in the VLE list box, the feeder composition may automatically be adjusted. Example if VLE saturated_liq is selected and the user sets the species mass fraction to 100% H2O(g), the unit may change this to 100% H2O(l). Please always double check the component make up when changing VLE methods.
- If you are using a Feeder in Demand Mode, the number in the QmReqd, or QvReqd, box will NOT indicate the amount of material flowing from the feeder, but the minimum flow.
- If you have elected to enter Species composition flows on an individual basis on the DSP page, (e.g. using the Mass Flow view), then you will not be allowed to enter flowrates in the QmReqd (Mass flow required) field. This is because the total mass flow will be calculated from the individual Species flows entered. If the total mass flowrate input is necessary, simply switch back to the Mass Fraction view after individual flow data input.
- The feeder unit operation can be used to connect flow information between graphics pages. There are two easy ways of connecting flow information:
- Through the Cross Page Connection. If this is successful, the two unit operations will be connected as though there is a physical connection. Thus, when SysCAD is building the solution, these two unit operations will be included in the same solve network.
- Through Composition Fetch. In this case, an IMAGE of the flow information from the source unit operation is copied onto the current Feeder/Cross Page unit operation. The user can customise the frequency and amount of information fetched.
NOTE: When using composition fetch, the unit operations stay separated from each other. Thus, there is no permanent connections being made even when the frequency is set to continuous. Therefore, when SysCAD is building the solution, the two unit operations can belong to two separate solve networks. The user can use this method to break up a recycle stream if the solution is difficult to obtain in a closed loop.
- If a project is opened using the Open with alternate Configuration command, Feeders MAY lose their species compositions IF the new configuration file does not contain all of the species in the original configuration.
- If Composition Fetch is set to 'Continuous', and depending on the CF.What selection, there may be a conflict with other settings. For example the VLE selection may be configured to set the temperature and you have selected temperature under composition fetch, then there is a conflict. Only one of these conflicting configurations should be configured. When there is a conflict, the CF is ignored.
- To set up feeder information when flowsheets are being solved separately using Activate/Deactive flowsheet option: Use the CF Fetch - Self Flows option.
1. Simple Composition Fetch from Stream or Contents
- Set Feeder Operation Selection - Operation = Stream Fetch mode, allowing SysCAD to copy Temperature, Pressure and Composition from the source unit.
- If user wish to copy the flow as well, then select the FetchFlow tickbox in the Required Mass Flow section. This will allow SysCAD to copy Flow, as well as T, P and composition from the source unit.
- To set up Source, use UnitTagName.Qo for pipes (eg P_001.Qo) or UnitTagName.QFeed for tanks (eg TNK_001.QFeed)
- In this simple fetch mode, data is copied continuously and user can choose only "T, P, Comp" or "T, P, Comp and Flow" modes (by selecting FetchFlow). If user wishes to fetch partial data only, then use the General operation mode to get the Full fetch feature, as shown in the next example.
2. Using Full Composition Fetch
- Set Feeder Operation Selection - Operation = General mode, allowing full functionality of the composition fetch.
- In the full composition mode, user has the flexibility to fetch only partial data, as well as control when the fetch will occur.
The diagram below shows a feeder (Leach_Solution) that has been connected to a sink (Leached_Soln). While the connection was still intact, SysCAD was solved, thus the Cross Page Connector carries an image of the flow condition, see Results: Flow Conditions section, the calculated information for Qm, Qv, T etc.
Use Composition Fetch to keep the pre-solved intermediate information as the feeder configuration information, this transfers Qm to QmReqd, T to T_Reqd etc.
If the user sets the frequency of the fetch to Continuous, then whenever values change, the feeder configuration will be updated. Therefore, if the Cross page connection is disabled, (either manually or through the deactivate flowsheet option in Project - ProBal setup), the feeder will always contain the previous solved information.
3. Set Feeder to Demand mode, while using material from Makeup Source
The new Link to MakeupSrc operation mode will allow user to set up the feeder to use both Demand and Makeup. In previous versions of SysCAD, user cannot use these two features together.
For example, consider the following Process Water distribution,
- Operation = "Link to MakeupSrc", this means the flow will come from the Makeup source, user do not have to set up any flow information as the T, P and composition of the specified makeup source will be used.
- A direct link is automatically added to show the makeup.
- The makeup source is set as "ProcessWater_Source"
- The feeder is also set with "Demand.On" ticked, this means the total flow will come from downstream demand, in this case, the Process Water distribution demand.
- Each distribution pipe have been set up with a demand flow, as shown in the demand table.
- When solved, the total water demand will be added as a "ProcessWater_Source" user, the flow is shown in the makeup source summary table, in our case, XPG_001 = 22 t/h.
4. Using Different Flow Basis Options
The user configures the following species make-up in the feeder:
The table below demonstrates how Flow Basis works.
- Set Required Mass Flow (QmReqd) = 10t/h
- Then setting FlowBasis to Solids will mean 10 t/h of solids is required, liquid and vapour flow will be calculated based on the phase mass fraction.
- The results of using all different flow basis are shown below, the blue numbers are calculated values.
Flow Basis Flow Rate All Solids Liquid Vapour Total (t/h) 10 20 20.83 500 Solids (t/h) 5 10 10.42 250 Liquid (t/h) 4.8 9.6 10 240 Vapour (t/h) 0.2 0.4 0.41 10
Adding this Model to a Project
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See Project Configuration for more information on adding models to the configuration file.
Insert into Project
See Insert Unit for general information on inserting units.