DYNAMIC MODELLING AND SIMULATION OF SUPERCRITICAL …

AKEEM KEHINDE OLALEYEPhD Research StudentSchool of Engineering

Supervisor: Dr. Meihong Wang

DYNAMIC MODELLING AND SIMULATION OF SUPERCRITICAL COAL-FIRED POWER

PLANT WITH CO2 CAPTURE

CONTENTS1

PROJECT BACKGROUNDCoal-fired power plant??? 2

PROJECT BACKGROUND

CO2 Emission reduction from

Coal-fired Power Plants

Coal-fired power plant – Emission Abatement Strategy 3

Approaches:

PROJECT BACKGROUNDSupercritical ???

Critical point of water-steam: 22.115 MPa, 374.150C

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Water Phase Diagram

PROJECT BACKGROUNDMOTIVATION

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Supercritical?•Challenge of climate change

•Need for higher generating capacity

•Need for improvement in efficiency

•Decommissioning of existing power plants based on available lifetime

•UK Grid Code Issues

Supercritical?•Challenge of climate change

•Need for higher generating capacity

•Need for improvement in efficiency

•Decommissioning of existing power plants based on available lifetime

•UK Grid Code Issues

• CO2 Separation

• Physical Absorption• Cryogenic separation• Membrane Separation• Chemical Absorption

• Chemical Absorption• Matured technology• High selectivity• readily available solvent

(MEA)

PROJECT BACKGROUNDPost Combustion CO2 Capture (PCC)

Typical PCC by Chemical Absorption Plant (SINTEF, 2012)

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PROJECT BACKGROUNDUK GRID CODE REQUIREMENT

The Primary Response capability (P) of a Generating Unit or a CCGT Module or Power Park Module or DC Converter is the minimum increase in Active Power output between 10 and 30 seconds after the start of the ramp injection.

The Secondary Response capability (S) is the minimum increase in Active Power output between 30 seconds and 30 minutes after the start of the ramp injection.

The High Frequency Response capability (H) of a Generating Unit or a CCGT Module or Power Park Module or DC Converter is the decrease in Active Power output provided 10 seconds after the start of the ramp injection and sustained thereafter.

Interpretation of primary and secondary response values Interpretation of primary and secondary response values

Interpretation of high frequency response valuesInterpretation of high frequency response values

System frequency

�Generation < Demand: Frequency falls

�Generation > Demand: Frequency rise

�Grid Code Frequency Range: 50±0.5Hz

System frequency

�Generation < Demand: Frequency falls

�Generation > Demand: Frequency rise

�Grid Code Frequency Range: 50±0.5Hz

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Typical Primary and Secondary frequency responseTypical Primary and Secondary frequency response

AIMS AND OBJECTIVES

To Develop a Dynamic model for a Supercritical Coal-fired (SCPC) Power Plant and to explore whether such a Supercritical Plant with CO2 post combustion capture ability can satisfy the UK grid requirements

To Develop a Dynamic model for a Supercritical Coal-fired (SCPC) Power Plant and to explore whether such a Supercritical Plant with CO2 post combustion capture ability can satisfy the UK grid requirements

AIM

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AIMS AND OBJECTIVES

OBJECTIVES

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RESEARCH METHODOLOGY

MODEL-BASED STUDIES OF SCPC POWER PLANT WITH CO2

CAPTURE

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RESEARCH METHODOLOGY 11

• Steady state simulation and validation of supercritical coal-fired power plant in Aspen Plus®

• Dynamic modelling, and validation using gPROMS®. gPROMS® modelling tool was selected due to:

• Equation-oriented tool• Parameter estimation/model fine tuning• Solvers capable of solving any order of ODE/PDE• Fluid property packages• Modelling of operating procedure• Analysis of dynamic model to satisfy UK grid code

• Steady state simulation and validation of supercritical coal-fired power plant in Aspen Plus®

• Dynamic modelling, and validation using gPROMS®. gPROMS® modelling tool was selected due to:

• Equation-oriented tool• Parameter estimation/model fine tuning• Solvers capable of solving any order of ODE/PDE• Fluid property packages• Modelling of operating procedure• Analysis of dynamic model to satisfy UK grid code

QUESTIONS ???? 12