modelControllerH2ForReformer
Extends from TransiEnt.Basics.Icons.Controller (Icon for controller).
Information
1. Purpose of model
This is a controller to control the hydrogen recycle mass flow rate for a steam methane reformer to ensure a given molar hydrogen to methane ratio at the inlet of the steam methane reformer.
2. Level of detail, physical effects considered, and physical insight
The composition and mass flow rate of the feed are measured and the necessary hydrogen mass flow rate is calculated depending on the expected reactions in the prereformer.
3. Limits of validity
The validity is limited because the composition is measured ideally and continuously which is not possible in reality.
4. Interfaces
m_flow_feed: input for the feed mass flow rate in [kg/s]
xi: input for the mass fractions of the feed [kg/kg]
m_flow_hydrogen_recycle: output for the hydrogen mass flow rate (positive sign) [kg/s]
5. Nomenclature
(no remarks)
6. Governing Equations
The hydrogen mass flow rate is calculated under consideration of the hydrogen and methane that will be produced out of C2H6, C3H8 and C4H10 and the desired hydrogen to methane molar ratio.
7. Remarks for Usage
(no remarks)
8. Validation
Tested in check model "TransiEnt.Components.Gas.Reactor.Check.TestControllerH2AndH2OForReformer"
9. References
(no remarks)
10. Version History
Model created by Carsten Bode (c.bode@tuhh.de) on Tue Apr 05 2016
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.MolarMass | M_H2 | 0.00202 | |
| SI.MolarMass | M_CH4 | 0.01604 | |
| SI.MolarMass | M_C2H6 | 0.03007 | |
| SI.MolarMass | M_C3H8 | 0.04410 | |
| SI.MolarMass | M_C4H10 | 0.05812 | |
| TransiEnt.Basics.Media.Gases.VLE_VDIWA_NG7_SG_var | vle_ng7_sg | ||
| Fundamental Definitions | |||
| Real | desiredMolarRatio | 0.34 | Desired molar ratio H2 to CH4 at the entrance of the SMR |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.Basics.Interfaces.General.MassFractionIn[vle_ng7_sg.nc] | xi | Mass composition of the feed before adding water or hydrogen | |
| TransiEnt.Basics.Interfaces.General.MassFlowRateIn | m_flow_feed | Feed mass flow rate before adding water or hydrogen | |
| TransiEnt.Basics.Interfaces.General.MassFlowRateOut | m_flow_hydrogen_recycle | Hydrogen mass flow rate that has to be added for given molar ratio |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.SimCenter | simCenter |