modelMethanationThreeStages
Extends from TransiEnt.Basics.Icons.MethanationThreeStages.
Information
1. Purpose of model
This model represents a three staged methanation reactor with intermediate cooling and a recirculation at the first reactor block
2. Level of detail, physical effects considered, and physical insight
The detail of this model is the same as the detail of the single reactor blocks. The heat exchanger are simplified heat exchangers with a fixed output temperature. A detailed description is found in [1].
3. Limits of validity
4. Interfaces
gaPortsIn: input of process gas
gasPortOut: output of process gas
fluidPortIn: input of cooling fluid (e.g. water)
fluidPortOut: output of cooling fluid (e.g. water)
5. Nomenclature
6. Governing Equations
The recycle ratio defines the ratio of process gas that is recycled.
7. Remarks for Usage
The predefined parameter values come from a calibration with an input pressure of 25 bar and an input composition of 84.4884% CO2 and 15.5116% H2 which represents the composition for an ideal methanation. Herefore the recycle rate is calibrated to a value of 1.6, such that the hydrogen share in the product gas is always below 5 mol-% which is the maximum share according to the DVGW G 260/262 which regulated the conditions for the integration of gas into the natural gas grid in Germany.
8. Validation
Validated in [1] with data from [2].
9. References
[1] Schülting, Oliver - Vergleich von Power-to-Gas-Speichern mit Ziel der Rückverstromung unter derzeit gültigen technischen Restriktionen (Masterarbeit), Technische Universität Hamburg - Institut für Energietechnik, 2016
[2] Harms, Hans - Methanisierung kohlenmonoxidreicher Gase beim Energie-Transport, Chem.-Ing.-Tech, 1980
10. Version History
Model created by Oliver Schülting (oliver.schuelting@tuhh.de) in Nov 2019
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | SteadyState | true | |
| Real | RecycleRate | ||
| Modelica.Units.SI.MassFlowRate | m_flow_nominal | nominal mass flow | |
| Modelica.Units.SI.Pressure | Delta_p_nominal_reactor_block | pressure loss in reactor block for nominal mass flow | |
| Modelica.Units.SI.Pressure | Delta_p_nominal_HEX | 5e-6 | pressure loss in heat exchanger for nominal mass flow |
| Modelica.Units.SI.Temperature | T_ambient | 300 | constant ambient temperature |
| Modelica.Units.SI.HeatCapacity | mCp_Nenn | 1.75e6 | nominal heat capacity of reactor block for nominal mass flow 1kg/s |
| Modelica.Units.SI.Temperature | T_HEX_out | 573.15 | |
| Modelica.Units.SI.Temperature | T_reactor_start | ||
| Boolean | useHomotopy | true | True, if homotopy method is used during initialisation |
| Boolean | deactivateTwoPhaseRegionForRealGas | true | Deactivate calculation of two phase region - needs to be 'false', if condensate heat of product gas calculation is important for coolant calculation |
| TransiEnt.Basics.Media.Gases.VLE_VDIWA_SG6_var | Medium | Medium model | |
| TILMedia.VLEFluidTypes.BaseVLEFluid | coolingFluid | simCenter.fluid1 | Medium which is cooling or heating medium1 |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.Basics.Interfaces.Gas.RealGasPortIn | gasPortIn | ||
| TransiEnt.Basics.Interfaces.Gas.RealGasPortOut | gasPortOut | ||
| TransiEnt.Basics.Interfaces.Thermal.FluidPortIn | fluidPortIn | ||
| TransiEnt.Basics.Interfaces.Thermal.FluidPortOut | fluidPortOut |