Centre for Computational Fluid Dynamics

FACULTY OF ENGINEERING

 

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CARBON CAPTURE & SEQUESTRATION


(Funding source and collaborators: EPSRC, Doosan Babcock, Eon, DH, TSB, BOC, RWE )

 

Maryam Gharebaghi CFD PhD Student

Maryam Gharebaghi pmmgh@leeds.ac.uk

Tel: + 44 113 343 3824

Project title: CFD Modelling of Oxy Fuel Combustion


Supervisor: Prof Mohamed Pourkashanian

Sponsor: Dorothy Hodgkin Postgraduate Awards (EPSRC/E-on)

Link to Personal Page

Project summary:

Sequestration as the process of capture and storage of carbon dioxide is an alternative process for limiting the greenhouse effect, to which coal fired power plants contribute. If coal combustion is performed using oxygen instead of air, the product will be rich in carbon dioxide and therefore ready for sequestration. This is known as Oxy fuel combustion. Oxy fuel combustion can be applied to conventional coal combustion plants with some modifications, however some technical challenges have to be addressed and it is still at demonstration phase in full industrial scale. One of the techniques to visualise parametric effects in boilers is computational fluid dynamics (CFD) modelling. CFD is widely applied as an industrial plant development tool and has been proven to be capable of predicting good trend answers both quantitatively and qualitatively.

The purpose of this project is to examine the pilot scale coal combustion furnace for carbon dioxide sequestration in Ratcliff power plant, by employing a commercial CFD code. The experimental case consists of a 1MW coal-fired low NOx burner attached to a rectangular furnace. To assess the extent of the modifications, there is a requirement for improvement or development in some of the mathematical models such as the Thermal model. This includes heat transfer – dominated by radiation and emissivity of gases –, heterogeneous char/carbon kinetic model which takes care of char combustion, gasification, unburned carbon and devolatilization modelling, fly ash/slagging phenomena and turbulence models.

Project start / end date:

October 2007 / March 2011

Research area:

Carbon Capture and Storage (CCS), post combustion, transport, advanced CFD process modelling, coal combustion, advanced power generation systems.

 

 

 

 

 

 

 

 

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Kris Larsen CFD PhD student

Kris Larsen pmkjl@leeds.ac.uk

Tel: +44 (0)113 343 2569

Research Interest: CFD Modelling of Biomass / Coal Co-firing Processes

Supervisors: Prof Mohamed Pourkashanian, Prof Alan Williams, Dr Ma Lin

China, the world’s second largest energy consumer, is attributed with over 40% of the global coal consumption to produce its electricity and yet also creates a 60% surplus in straw for animal feed. Besides releasing its stored CO2, the straw surplus will also produce CH4 if allowed to rot or uncontrolled poisonous emissions if simply burnt. Co-firing of biomass with coal in pulverised fuel power stations may enable a short term and economical method of reducing the fossil-fuel source carbon emissions associated with power generation, particularly if a local source of biomass can be used. Significant challenges are posed by this however, including: production, transportation, storage and processing of the biomass as well as its composition, mixing with coal and effects upon efficiency, flame stability, harmful emissions and furnace maintenance. Despite computer modelling of coal combustion being well established, physical and chemical kinetics of biomass particles require investigation and development.

This PhD project supports the computational modelling for an international EPSRC programme, encompassing researchers from the universities of Leeds, Kent and Nottingham in the UK and Zhejiang, Tianjin and Xi’an in China, looking into the characterisation of biomass fuel, continuous measurement of the fuel delivery and furnace conditions and modelling to facilitate and subsequently optimise efficient power generation through co-firing.

 
Rachael Porter CFD PhD student

Rachael Porter pmrp@leeds.ac.uk

Tel: +44 (0)113 343 2481

Supervisors: Mohamed Pourkashanian & Alan Williams

Research Interest: Performance Prediction Methods for Modern Power Plant Boilers

The mitigation of greenhouse gas emission is crucial in order to address the issue of climate change. Oxyfuel firing in coal fired power stations is one proposed technology that will facilitate carbon capture and storage (CCS) and reduce the greenhouse gas emissions from coal fired power stations. Oxyfuel is a relatively new technology and so far demonstration projects are underway but no full scale plants are operating. Therefore accurate CFD modelling of the technology is important to aide design of new boilers and increase understanding of the underlying physical and chemical processes. Oxyfuel increases the concentration of CO2 by burning coal with oxygen and using recycled flue gases to quench the temperature. Standard CFD models require improvement to account for changes in the chemistry and heat transfer compared to normal combustion.

Heat transfer by radiation is a complex problem to model when coupled with all the interacting process within a furnace. This project focuses on improvements to heat transfer models by modelling more accurately the radiative properties of the medium in oxyfuel combustion and generating better predictions for the heat transfer in CFD. Improvements will also be made to other sub-models relevant to heat transfer. Data from detailed CFD models will be used to develop design models for oxyfuel and provide predictions of full-scale plants. Data from test rigs will be used to validate the models.

 
Penny Edge CFD PhD student

Penny Edge pmpje@leeds.ac.uk

Project Title: CFD Modelling of Oxy-Coal Combustion

Supervisor: Mohamed Pourkashanian

Sponsor: EPSRC

The relative abundance and flexibility of coal guarantee it to be a major part of the global energy mix for the foreseeable future.
However there is an imminent need to curb CO2 emissions and so new combustion technologies are being developed to facilitate carbon capture and storage (CCS). Oxy-Coal combustion involves burning the coal in an oxygen-rich environment; pure oxygen would cause flame temperatures too high for the durability of the enclosure so the oxygen is diluted with recycled flue gas (RFG) which is primarily CO2.
This method effectively eliminates the vast majority of nitrogen from the combustion process and provides a C02-rich flue gas ready to be sequestered. The project involves CFD modeling of the full process from oxygen production through to CO2 compression to examine interaction between the components and identify potential to increase design efficiency. The model components will be validated using data from a pilot scale test facility.

 
Sreenivasa Rao Gubba

Sreenivasa Gubba
BE, MSc, PhD
CFD Research Fellow
Tel: +44/0 113 343 3824
Fax: +44/0 113 246 7310
s.r.gubba@leeds.ac.uk

Standard personal webpage

Personal website

 
Dr Lin Ma

Lin Ma
BSc, MSc, PhD
Senior Research Fellow
Tel: +44 (0)113 343 2481
Fax: +44(0)113 246 7310
L.Ma@leeds.ac.uk

personal webpage

 
Richard Porter

Richard Porter
MEng, PhD (Leeds)
Research Fellow
Tel: +44 (0)113 343 2481
Fax: +44 (0)113 246 7310
r.t.j.porter@leeds.ac.uk

personal webpage

 
mohamed pourkashanian

Professor MC Pourkashanian
MSc, PhD (Leeds)
Professor in High Temperature Combustion Processes

Tel: +44 (0)113 343 2512
Fax: +44 (0)113 246 7310
fue6mtz@leeds.ac.uk

personal webpage

 
Prof Alan Williams

Emeritus Professor Alan Williams, CBE
BSc, PhD, CChem, FRSC, CEng, FInstE, FInstPet, FIGasE, FRSA, FREng.
Tel: +44 (0)113 343 2507
Fax: +44 (0)113 246 7310
fueaw@leeds.ac.uk

personal webpage