Modelling Water Scrubbing Biogas Based Technology William Nock,
Sonia Heaven, Charles Banks Faculty of Engineering and the
Environment, University of Southampton [email protected]
Promotion of Biogas Upgrading and Bottling in India and European
Union Slide 2 Why do we need a model? Description of real life
situations Tool to help design and operate a system Provide
predictions on how a system will behave under different conditions
Everything should be made as simple as possible, but not simpler-
Albert Einstein Slide 3 Promotion of Biogas Upgrading and Bottling
in India and European Union Modelling Approach Equilibrium Based
Models Rate Based Models 1D, 2D or 3D Steady state or dynamic model
CFD Empirical design HETP and HTU/NTU Slide 4 Promotion of Biogas
Upgrading and Bottling in India and European Union Well mixed
system with negligible directional concentration gradients Ideal
Gas Law and ideal liquid flow Isothermal reactor Chemical reaction
Which species should mass transfer consider Mass transfer liquid or
gas side dominant? Modelling Assumptions Slide 5 Promotion of
Biogas Upgrading and Bottling in India and European Union Model
Derivation L IN L OUT G OUT G IN z Q G, Z c G, Z Q G, Z+Z c G, Z+Z
Q L, Z+Z c L, Z+Z Q L, Z c L, Z Q G, Z+Z c G, Z+Z c L, Z+Z Q L, Z c
L, Z Slide 6 Promotion of Biogas Upgrading and Bottling in India
and European Union Plug Flow Reactor z Q G, Z c G, Z Q L, Z+Z Q G,
Z+Z c G, Z+Z c L, Z+Z Q L, Z c L, Z z+z z Accumulation = input
output reaction Slide 7 Promotion of Biogas Upgrading and Bottling
in India and European Union Axial Dispersion Model z Q G, Z c G, Z
Q L, Z+Z Q G, Z+Z c G, Z+Z c L, Z+Z Q L, Z c L, Z Accumulation =
input output reaction Slide 8 Promotion of Biogas Upgrading and
Bottling in India and European Union Boundary Conditions Closed -
Closed Open - Open Slide 9 Promotion of Biogas Upgrading and
Bottling in India and European Union Mass Transfer Theory Interface
Bulk Gas Bulk Liquid Liquid Film Gas Film cGcG c Gi c Li cLcL Slide
10 Promotion of Biogas Upgrading and Bottling in India and European
Union Mass Transfer Theory cGcG Interface Bulk Gas (c G ) Bulk
Liquid (c L ) Liquid Film Gas Film cLcL Slide 11 Promotion of
Biogas Upgrading and Bottling in India and European Union Empirical
Correlations Henrys Law Mass transfer coefficients Interfacial area
Pressure drop Gas/ liquid holdup Slide 12 Promotion of Biogas
Upgrading and Bottling in India and European Union Finite
Difference Slide 13 Promotion of Biogas Upgrading and Bottling in
India and European Union Finite Difference Slide 14 Promotion of
Biogas Upgrading and Bottling in India and European Union Summary
Simple models often out perform more detailed models Assumptions
need to be taken with care Slide 15 Promotion of Biogas Upgrading
and Bottling in India and European Union Thank you for
listening