RegenerativeAirPreheater L4

Created Thursday 20 March 2014

A simplified model for simulation of regenerative air preheaters.

1. Purpose of Model


This model is used to simulate regenerative air preheaters in a simplified way due to neglection of a moving storage mass. This simplification is compensated by a special heat transfer correlation. The heat transfer correlation used can be found in Effenberger [2].

2. Level of Detail, Physical Effects Considered and Physical Insight


2.1 Level of Detail


Referring to Brunnemann et al. [1], this model refers to the level of detail L4.

2.2 Physical Effects Considered


2.3 Level of Insight


Heat Transfer

Pressure Loss


3. Limits of Validity


4. Interfaces


4.1 Physical Connectors


Basics:Interfaces:GasPortIn freshAirInlet
Basics:Interfaces:GasPortOut freshAirOutlet
Basics:Interfaces:GasPortIn flueGasInlet
Basics:Interfaces:GasPortOut flueGasOutlet

5. Nomenclature


6. Governing Equations


6.1 System Description and General model approach


This model of an regenerative air preheater is build up from submodels of two VolumeGas L4 components, a ThinWall L2 model and two junction elements FlueGasJunction L2 and ThreeWayValveGas L1 simple. The rotation of the storage mass can be neglected when the recommended heat transfer correlation for regenerative air preheaters is used. Gas cell arrays are used to discretise the hot and the cold side of this heat exchanger. Via a controllable splitter, the mass losses between fresh air and flue gas paths are regarded with a constant factor. The storage mass can be calculated out of the given parameters or set with a parameter m_fixed.



Summary

A summary record is available which bundles important component values.

7. Remarks for Usage


8. Validation

The outlet temperatures of the "Quartsektor" air preheater RegenerativeAirPreheaterSecAir L4 (which uses the same recommended heat transfer correlation) were compared within two simulated scenarios. In the first scenario the results of a stationary simulation point are compared with the design values of an air preheater. In the second scenario the results of a dynamic simulation with a step of the secondary air inlet temperature are compared with calculation results of an established power plant simulator software for training purposes.

9. References

[1] Johannes Brunnemann and Friedrich Gottelt, Kai Wellner, Ala Renz, André Thüring, Volker Röder, Christoph Hasenbein, Christian Schulze, Gerhard Schmitz, Jörg Eiden: "Status of ClaRaCCS: Modelling and Simulation of Coal-Fired Power Plants with CO2 capture", 9th Modelica Conference, Munich, Germany, 2012
[2] Helmut Effenberger: "Dampferzeugung", Springer-Verlag Berlin Heidelberg New York, 2000, ISBN:3-450-64175-0

10. Authorship and Copyright Statement for original (initial) Contribution

Author:
DYNCAP/DYNSTART development team, Copyright 2011 - 2022.
Remarks:
This component was developed during DYNCAP/DYNSTART projects.
Acknowledgements:
ClaRa originated from the collaborative research projects DYNCAP and DYNSTART. Both research projects were supported by the German Federal Ministry for Economic Affairs and Energy (FKZ 03ET2009 and FKZ 03ET7060).
CLA:
The author(s) have agreed to ClaRa CLA, version 1.0. See https://claralib.com/pdf/CLA.pdf
By agreeing to ClaRa CLA, version 1.0 the author has granted the ClaRa development team a permanent right to use and modify his initial contribution as well as to publish it or its modified versions under the 3-clause BSD License.

11. Version History

Date - Version - Description of changes - author/revisor
25.06.2013 - v0.1 - initial implementation of the model - Lasse Nielsen, TLK-Thermo GmbH


Backlinks: ClaRa:Components:HeatExchangers:RegenerativeAirPreheaterSecAir L4