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Zhiwu Liang*, Hongxia Gao, Teerwat Sema, Paitoon Tontiwachwuthikul

zwliang@hnu.edu.cn

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

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Outline

CCUS in China

Introduction and Literature review

Results and Discussion

Simulation of conventional process

Simulation and optimization of HPDSFP process

Conclusions & Recommendations

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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

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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)

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China Huaneng Group

By 2010, total capacity:

113.4GW

CO2 Capture:

3000 tons/Year in 2008,

103,000 tons/Year in 2010

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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

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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

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Enterprise activities

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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

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Literature for process configurations

REBOILER

STRIPPER ABSORBER

GAS IN

GAS OUT CO2 OUT

Baseline MEA process flow sheet

High energy consumption

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12 (Zhiwu Liang, 2010)

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Heat pump distillation with Split flow process (HPDSFP )

Process Simulation using ProMax3.0

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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

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— Simulation of conventional process

Effect of circulation rate

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Effect of stripper pressure Effect of temperature approach

Re-boiler duty 3.37 GJ/t CO2

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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

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Effect of Rich2 feed location

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Effect of compressor pressure change

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Effect of CO2 lean loading change

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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

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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

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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…….

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Multifunctional Pilot Plants

Three system: 50 system; 100 system; 150 system.

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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！

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