Modeling and Simulation of Heat Recovery Absorption-Based Carbon Capture Process Adisorn Aroonwilas and Amornvadee Veawab Energy Technology Laboratory, Faculty of Engineering and Applied Science, University of Regina Saskatchewan, Canada S4S 0A2 Presented at The 9 th Trondheim Conference on CO 2 Capture, Transport and Storage (TCCS-9) June 12-14, 2017 Trondhiem, Norway
16
Embed
Modeling and Simulation of Heat Recovery Absorption … · Integration to power plant ... Simulate the Heat Recovery Gas Absorption process ... (Gas + Liquid) •Viscosity, density
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Modeling and Simulation of Heat Recovery
Absorption-Based Carbon Capture Process
Adisorn Aroonwilas and Amornvadee Veawab
Energy Technology Laboratory, Faculty of Engineering and Applied Science,
University of Regina
Saskatchewan, Canada S4S 0A2
Presented at
The 9th Trondheim Conference on CO2 Capture, Transport and Storage (TCCS-9)
June 12-14, 2017 Trondhiem, Norway
Outline
Conventional absorption process
Heat recovery absorption process
Objective
Methodology
Simulation results
Integration to power plant
Economic analysis
Conclusions
Acknowledgements
Conventional Absorption Process
Intensive energy requirement for regeneration
High operating cost
CO2 rich loading: 0.35 – 0.45 mol/mol
Energy consumption: 75,000 – 80,000 BTU/lb-mol CO2
(4.0 – 4.2 MJ/kg CO2)
Feed Gas
Treated Gas CO2
Liquid Solvent (Lean)
Liquid Solvent
(Rich)
REGENERATION
COLUMN ABSORPTION
COLUMN 0
2
4
6
8
10
12
14
310 320 330 340 350
Temperature ( K )
Co
lum
n H
eig
ht
(m)
0
2
4
6
8
10
12
14
16
0.2 0.25 0.3 0.35 0.4 0.45 0.5
CO2 loading (mol/mol)
Pco
2 (
kP
a)
Operating
Equilibrium
0
10
20
30
40
50
60
70
80
90
0 0.1 0.2 0.3 0.4 0.5 0.6
CO2 loading (mol/mol)
CO
2 p
art
ial
pre
ss
ure
(k
Pa
) Typical Amine Process
Equilibrium line
Operating line
Heat Recovery Gas Absorption
Primary features:
Manipulation of column temperature to
maximize CO2 loading in rich-amine solution at
absorber (CO2 loading > 0.5mol/mol)
Recover exothermic heat energy from CO2
absorption and utilize it for solvent regeneration
Heat Recovery Gas Absorption
ABSORBER
REGENERATOR
LEAN-RICH HEAT
EXCHANGER
LEAN HEATER (HEAT-
RECOVERY
EXCHANGER A)
HEAT-
RECOVERY
EXCHANGERS
B & C
HEAT-RECOVERY
CONDENSER
Section 1
Section 2
Section 3
Section 4
Lean liquid
Loaded liquid I
Loaded liquid II
Loaded liquid III
Rich liquid
Gas
TREATED GAS
CONDENSER
Treated gas
LEAN COOLER
PINCHED COOLER
PINCHED COOLER
RICH LIQUID PUMP LEAN LIQUID PUMP
CONDENSATE PUMP
REBOILER
REFLUX CONDENSER
FLASH SEPARATOR
ACCUMULATION DRUM
High purity gaseous component
Ultra rich CO2
loading
Use of
exothermic heat
Elevated Temp
Kinetic-driven
mass transfer
Lower Temp
Thermodynamic
-driven mass
transfer
Objective
Simulate the Heat Recovery Gas Absorption
process (Economic-Technical process model)
Evaluate performance and energy consumption
Compare with typical process scheme
GdY
dzIk a
Py
HCI
A
L
o
e
A i
A L
,
,
GdY
dzk a P y yI
A
G A e A A i , ,
GdY
dzk a P y yI
S
G S e S S i , ,
GdY
dz
L dC
dzI
A
AB
B
G Y CdT
dzh a T TI j p j
j
G
G e G L,
LCdT
dzG Y C
dT
dzG H
dY
dzG H
dY
dzp L
L
I j p jj
G
I R
A
I S
S
, ,
Mass-Transfer:
Energy Balance:
Heat-Transfer:
Material Balance:
Methodology
Input
Information
Result
Representation
Process Flow Model &
Simulator
(Different Process Flow
scheme)
Rate Based Sub-Model
•Absorber design
•Regenerator design
•CO2-Amine reaction
Thermodynamic Model
•Vapor-liq equilibrium
•Speciation
Equipment Design Model
•Pump, blower
•Cooler, heat-exchanger
•Condenser, reboiler
Property Model
(Gas + Liquid)
•Viscosity, density
•Vapor pressure
•Others
Steam Property Model
•Enthalpy, entropy,
•Others
Process flow model (Absorption process)
Process simulation
Simulation conditions: Gas stream Coal-fired flue gas (16% CO2)
Process capacity 1,000 tonne CO2/day
CO2 capture efficiency 90%
Absorption solvent Aqueous MEA solution
Solvent concentration 5.0 kmol/m3
CO2 content after regen. 0.15-0.24 mol CO2/mol MEA