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Abstract
In large and complex processes use of simulators will
take place more and more in the future to avoid and learn
about transients and unexpected situations. There are
plenty of dynamic simulation tools in the markets but
most of them have been developed and used for quite
specific and limited application areas. At the moment
there are just few simulation tools which are capable to
handle dynamically in the same simulation case
challenging process areas like combustion, distillation,
chemistry and control of very large process areas. For
this reason, in this study, there was a need to carry out
co-simulation where two dynamic simulation tools Apros
and Aspen Plus Dynamics were combined together by using
Matlab Simulink as an interface. The co-simulation
approach was a way to construct large dynamic process
simulation environment, where typical operational
transients and failure situations of an oxy fired power
plant were possible to test and analyze.
Under EU 7th Framework Programme (FP7) the FLEXI BURN CFB
project an oxy firing concept based on circulated
fluidized bed (CFB) combustion and supercritical
once-through (OTU) water steam cycle was developed and
successfully demonstrated [1]. This project also
generated a dynamic simulation model of the 1st
generation oxy firing concept, as we call it. In the EU
7th Framework Program's project O2GEN (Optimization of
Oxygen-based CFBC Technology with CO2 capture), the 2nd
generation concept of CFB based oxy firing was developed.
The target of the project was, at first, to increase O2
content in recirculated flue gas to see what kind of
effect it has to the heat exchange and corrosion in the
boiler. Secondly, the target was to carry out exergy
analysis to increase the whole concept efficiency by
decreasing energy consumption in the boiler, Air
Separation Unit (ASU) and CO2 -purification unit (CPU).
Based on these steady state analysis means the refined
concept was then modelled for dynamic simulations which
were carried out by using Apros and Aspen Plus Dynamics
dynamic modelling tools in a co-simulation mode.
This paper deals with dynamic simulation of the 2nd
generation 600 MW oxy fired CFB once trough boiler. In
this paper we will present the dynamic model which
includes oxy fired CFB boiler, turbine island, ASU and
CPU with all needed equipment like heat exchangers,
pipes, pumps, air and fuel feeding systems, distillation
columns and sequestration vessels. Automation like
measurements, controllers and actuators are included in
the model. The simulation case selected for this paper
presents an analysis what happens when one of the oxidant
fans trips on boiler full load operation and how to
handle this kind of failure by decreasing the boiler load
to sufficient level of regarding the available oxidant
feeding capacity. There were several items which were
taken into account in the boiler, turbine island, ASU and
CPU side when this kind of failure takes impact. The main
findings in the failure analysis will be presented.
Finally, discussion and future aspects of the simulation
approach described will be given
Original language | English |
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Pages (from-to) | 561-572 |
Journal | Energy Procedia |
Volume | 114 |
DOIs | |
Publication status | Published - 2017 |
MoE publication type | A1 Journal article-refereed |
Event | 13th International Conference on Greenhouse Gas Control Technologies, GHGT-13 - Lausanne, Switzerland Duration: 14 Nov 2016 → 18 Nov 2016 |
Keywords
- CFB
- ASU
- CPU
- CCS
- dynamic simulation
- modelling
- co-simulation
- oxy firing
- Apros
- Aspen Plus Dynamics
- oxidant fan failure
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Dive into the research topics of 'Modelling and dynamic simulation of the 2nd generation oxy fired power plant - oxidant fan failure case'. Together they form a unique fingerprint.Projects
- 1 Finished
-
O2GEN: Optimization of Oxygen-based CFBC Technology with CO2 capture
Pikkarainen, T. (Manager)
18/10/12 → 17/10/15
Project: EU project