1
Zhiwu Liang*, Hongxia Gao, Teerwat Sema, Paitoon Tontiwachwuthikul
Joint International Center for CO2 Capture and Storage (iCCS), Hunan University,
Changsha, P.R. China,
International Test Center for CO2 Capture (ITC), University of Regina, Canada
Process improvement & simulation of CO2 absorption into aqueous MEA for coal-fired power plant
PCCC2 Conference, Bergen, Norway, Sep.17, 2013
2
Outline
CCUS in China
Introduction and Literature review
Results and Discussion
Simulation of conventional process
Simulation and optimization of HPDSFP process
Conclusions & Recommendations
3
CCUS in China Situation of CO2 Emissions in China
Coal is the main energy source 70.4% energy from the form of coal
Most of the coal is burned for
electricity Coal-fired electric power is
the main form of power production, 75%
of total generating capacity
Carbon Emissions in China have to be controlled
In 2010, CO2 emissions in CN-8.3GT, 1/4world 33.2GT
1980-2009 Total Year Emission of CO2
4
Companies working along with MOST Chinese Government to reduce CO2 emissions
Shaanxi Yanchang Petroleum (Group)
Corp. Ltd., Oil-12.0M tons (in 2010)
China Huaneng Group
CNPC Group, Oil-105M tons, Nature
Gas-72.5G M3 (in 2010)
Sinopec Group, Oil-60.9M tons, Nature Gas-12.5 G M3 (in 2010)
5
China Huaneng Group
By 2010, total capacity:
113.4GW
CO2 Capture:
3000 tons/Year in 2008,
103,000 tons/Year in 2010
6
CCUS activities and pilot Projects in China
MOST Supported S&T activities (11th Five Year Plan)
Project Title Funding by Duration Type of projects
The Project of CCS–EOR, Utilization
and Storage 973 2006-2010 Basic Research
Program of CO2 Capture and Storage
technology 863 2008-2010
Technology R&D The Key Tech Research Program on
CCS-EOR and Storage 863 2009-2011
The Key Tech Research Program on
CO2-Algae-Biodiesel 863 2009-2011
CO2- Safety Mining of with CO2 Gas
Reservoirs and CO2 Utilization tech National Major
Special Project 2008-2010
R& D Demonstration Project of Mining and
Utilization Tech of Volcanic gas
containing CO2 in Songliao Basin
National Major
Special Project 2008-2010
7
Name of Projects Funding by Duration Type of projects
The Key Tech Research and
Demonstration Program of Carbon
Capture and Equipment on 35 MWt
Oxy-Fuel Combustion
National Key Technology
R&D Programme
2011-2014
Technology R&D
The Key Tech Research Project of
CO2 Emission Reducing on Iron-
Steel Sector
National Key Technology
R&D Programme
2011-2014
Technology R&D Research and Demostration Program
of IGCC +CO2 Caputure, Utilization
and Storage
National Key Technology
R&D Programme
2011-2013
CO2 Storage Capacity Assessment
and Demonstration in China
China Geological Survey
2011-2014
The Program of CCS –EOR,
Utilization and Storage
973 2011-2015 Basic Research
8
Enterprise activities
9
Introduction and Literature review PCCC Technology using chemical solvents
How to Reduce heat energy consumption?!
NH2 CH2 CH2 OH
CH2 CH2 OH
CH2 CH2 OHNH
OHCH3
OOS
Chemical absorption solvents To get high capacity, lower reaction heat
and fast absorption-stripping….. ……..e.g. amine-based, carbonate-based
and ammonia-based systems Advanced Contactors To increase Mass Transfer, reduce
capital cost and pressure drop e.g. Structured packing column Inhibitors of degradation To increase amine concentration and
stripping pressure or temperature Process configurations and simulation To integrate the utilization of the heat of
various streams Emerging methods (novel solvent) e.g. metal organic frameworks,
enzyme-based systems and ionic liquids
10
Literature for process configurations
REBOILER
STRIPPER ABSORBER
GAS IN
GAS OUT CO2 OUT
Baseline MEA process flow sheet
High energy consumption
11
12 (Zhiwu Liang, 2010)
13
Heat pump distillation with Split flow process (HPDSFP )
Process Simulation using ProMax3.0
14
Results and Discussion
Flue gas specification
Flue gas composition
CO2 (mol %) 14.6
N2 (mol %) 77.9
O2 (mol %) 3.3
H2O (mol %) 4.2
Flue gas feeding temperature(°C ) 40
Flue gas flow rate (kmol/h) 40000
Flue gas feeding pressure (kPa) 109
Summary of Flue Gas Composition and its conditions
Reboiler
eq
n i ci compsi=1
i
W
T 10K T0.75 Q W
T 10K
+ −= × + + ∑
Where Ti is the re-boiler temperature(K) ,
the temperature of steam is in the re-boiler
is 10 °C higher than Ti, Qi is the re-boiler
duty(GJ/t CO2), and Tc=313K.
The total equivalent work
15
— Simulation of conventional process
Effect of circulation rate
16
Effect of stripper pressure Effect of temperature approach
Re-boiler duty 3.37 GJ/t CO2
17
Effect of Rich2 fraction
Rich2
fraction,%
Reboiler
duty, GJ/t
CO2
Compression
work, GJ/t
CO2
Weq,
GJ/t CO2
Circulation rate
Kmol/h
CO2 Rich loading,
mol/molMEA
4 2.418 0.127 0.525 155613.029 0.539
6 2.009 0.138 0.469 155693.418 0.539
8 1.868 0.150 0.458 155793.100 0.539
10 1.758 0.161 0.450 155878.340 0.539
12 1.734 0.172 0.457 155954.583 0.539
14 1.718 0.184 0.467 156045.677 0.539
16 1.704 0.195 0.476 156115.196 0.539
— Simulation and optimization for HPDSFP
18
Effect of Rich2 feed location
19
Effect of compressor pressure change
20
Effect of CO2 lean loading change
21
Comparison results for the configurations and the literature
Process configuration Lean
loading QR (GJ/t CO2) Comp work (GJ/t CO2) Weq(GJ/t CO2)
Baseline MEA process 0.25 3.37 / 0.555
HPDSFP process 0.25 1.84 0.062 0.365 Multi-pressure stripper with
vapor recompressiona 0.34 2.49 0.369 0.780
Two split-feeds semi-lean
heat EXC 0.20 2.37 / 0.391
4-stage flashb 0.370 / / 0.821 a- Jassim and Rochelle, 2006, b -Wagener and Rochelle, 2011, c- Liang, 2010
22
Conclusions The most obvious feature of the HPDSFP process is to combine
the advantages of split stream and heat pump distillation, which
can significantly reduce the re-boiler duty by using the latent of
vapor from the stripper;
Compared to the baseline process,the innovative process of
HPDSFP was able to significantly reduce the energy consumption
by 34.2%;
Despite of good saving in energy requirement compared to
the baseline process, the total equipment investment increases
because of compressor and heat exchangers is added.
Hunan University of China
Hunan Univ. Changsha
Beijing
Hongkong
24
Joint International Center for CO2 Capture and Storage (iCCS)
iCCS was co-established by Hunan University and University of Regina in September 2009. Memebers including professors, engineers, graduates are from Hunan University, U of Regina…….
25
Multifunctional Pilot Plants
Three system: 50 system; 100 system; 150 system.
26
Acknowledgments National Natural Science Foundation of China (No. 21376067)
National Natural Science Foundation of China (No. 21276068 & 2140110514)
Ministry of Science and Technology of the People’s of Republic of China (No.
2012BAC26B01)
Ministry of Education of the People’s of Republic of China-Supported
Program for Innovation Research Team in University (No. IRT1238)
Shaanxi Yanchang Petroleum (Group) Co., LTD.
Joint International Center for CO2 Capture and Storage (iCCS), College of
Chemistry and Chemical Engineering, Hunan University, P.R. China
Natural Science and Engineering Research Council of Canada (NSERC)
Canada Foundation of Innovation (CFI)
International Test Centre for CO2 Capture, Faculty of Engineering and
Applied Science, University of Regina, Canada
Thank you!
27