comparative evaluation of a new liquid absorbent in a pcc ... · comparative evaluation of a new...

Comparative evaluation of a new liquid absorbent in a PCC pilot plant in ChinaPCC pilot plant in China

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PCCC3, Regina, September 2015ENERGY

Paul Feron, Will Conway, Graeme Puxty, Leigh Wardhaugh, Phil Green, Dan Maher, Debra Fernandes, Ashleigh Cousins, Aaron Cottrell, Kangkang Li, Gao Shiwang, Liu Lianbo, Niu Hongwei, Shang Hang, Wang Jinyi, Wang Shiqing, Guo Dongfang, Marcel Maeder, Sarah Clifford

PCC3 – China: Project Objectives and Approaches

What?1 Reducing energy penalty of1. Reducing energy penalty of

PCC2. Reducing costs for PCCg

How? 1 New liquid absorbent1. New liquid absorbent

formulations2. PCC Process modifications

2 | Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China | Ashleigh Cousins

Dave et al. 2011, Energy Procedia 4, 1869 ‐ 1877

2. PCC Process modifications

Properties of the ideal liquid absorbent for PCCN t lNot only:High cyclic capacityHigh rates of absorptiong pLow desorption energy requirementBut also: Low cost Low costResistance to oxidationResistance to other routes for degradation No impact of O2, SOx, NOx and fly ashNo corrosion issuesNo concerns around health safety and environment


No concerns around health, safety and environment

Process focused liquid absorbent formulation

1.2

1.4

αrich at 5 kPa CO2 and 313 K, Reboiler temperature max. 150 oCCharacterised in this project: 15 primary amines excl. MEA, AMP2 d i l PZ DEA

0.8

1

e to 4.9 M

MEA 4.9 M MEA 3 M AMP

3.8 M DEA 3 M MDEA

2 secondary amines excl. PZ, DEA 11 tertiary amines excl. TEA, MDEA No diamines No ammonia

0.4

0.6

Mass T

ransfer relative

1 M PZ Blend 1

Blend 2 Blend 3

Blend 4 Blend 5

No ammonia

In process development facility:Blend 3/4: I + II

0

0.2

0.6 0.8 1 1.2 1.4

M

Blend 6Blend 3/4: I + II

In pilot plant in China:Blend 5/6: I + I

4 |

Minimum Reboiler Energy Requirement relative to 4.9 M MEA Blend 5/6: I + I

Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China | Ashleigh Cousins

Pilot plant validation in China


Huaneng Changchun CO2 capture Pilot plantPilot plant


Pilot plant design information

Gas flow: up to 900 kg/hGas temperature: 50 – 65 oC

3/

Columns Pipe size Packing Packing

Liquid flow: up to 5 m3/h

Columns Pipe size height material

DCC DN450 3.0 m RSP250Absorber DN350 8.0 m RSP250Wash DN350 1.9 m RSP250

Stripper DN250 8.6 m RSP250


PCC Pilot plant campaigns

Liquid absorbent MEA Blend 5 Blend 6

Duration (h) 1063 306 351Average SO2‐content at inlet < 1 ppm ~ 3 ppm ~ 5 ppm

Average NOx‐content at inlet ~ 70 ppm ~ 25 ppm ~ 15 ppm

Range CO content [%] 9 1 13 4 9 9 13 4 8 8 13 0Range CO2 content [%] 9.1 – 13.4 9.9 – 13.4 8.8 – 13.0

Range O2 content [%] 5.2 – 10.0 5.0 – 9.5 5.8 – 9.7

CO2‐removal [%] 91 ± 3 90 ± 1 90 ± 12

Liquid‐gas ratio range [kg/kg] 2.4 – 4.3 1.1 – 4.9 2.5 – 9.3

Bottom temperature stripper [oC] ~ 120 ~ 120 ~ 118

8 |8 | Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China | Ashleigh Cousins

Reboiler duty for MEA campaigns

CO2 t t 9 0 10 5% CO2 t t 10 5 12 0%CO2 t t 9 0 10 5% CO2 t t 10 5 12 0% CO2 content 9 0 10 5% CO2 content 10 5 12 0%CO2 content 9 0 10 5% CO2 content 10 5 12 0%

20.5 % MEA 17.6 % MEA

6.5

7.0

CO2‐content 9.0‐10.5% CO2 content 10.5‐12.0%

CO2‐content 12.0‐13.5% Process simulation CO2 content 12%

6.5

7.0


CO2‐content 12.0‐13.5% Process simulation CO2 content 12%

6.5

7.0


CO2‐content 12.0‐13.5% Process simulation CO2‐content 12%

6.5

7.0


CO2‐content 12.0‐13.5% Process simulation CO2‐content 12%

4 0

4.5

5.0

5.5

6.0

Specific Reboiler duty [MJ/kg CO2]

4 0

4.5

5.0

5.5

6.0


4.5

5.0

5.5

6.0


4.5

5.0

5.5

6.0


3.0

3.5

4.0

2.0 2.5 3.0 3.5 4.0 4.5 5.0L/G [kg/kg]

3.0

3.5

4.0

2.0 2.5 3.0 3.5 4.0 4.5 5.0L/G [kg/kg]

3.0

3.5

4.0

2.0 2.5 3.0 3.5 4.0 4.5 5.0L/G [kg/kg]

3.0

3.5

4.0

2.0 2.5 3.0 3.5 4.0 4.5 5.0L/G [kg/kg]


Results Blend 5

70

Lean solution concentration Wash water concentration

70

Lean solution concentration Wash water concentration

6

Period 2 Period 1

6

Period 2 Period 1

40

50

60

70

Concentration 40

50

60

70

Concentration

5

6

Specific

5

6

Specific

10

20

30Concentration

[wt%]

10

20

30Concentration

[wt%]

3

4reboiler duty [MJ/kg CO2]

3

4reboiler duty [MJ/kg CO2]

00 50 100 150 200 250 300 350 400

Duration [h]

00 50 100 150 200 250 300 350 400

Duration [h]

20 1 2 3 4

L/G [kg/kg]

20 1 2 3 4

L/G [kg/kg]


Reboiler duty comparison MEA vs Blend 5

5 5

6.0

MEA Blend 5 MEA modelling

5 5

6.0

MEA Blend 5 MEA modelling

4 0

4.5

5.0

5.5

Specific reboiler duty 4 0

4.5

5.0

5.5

Specific reboiler duty

2.5

3.0

3.5

4.0reboiler duty [MJ/kg CO2]

2.5

3.0

3.5

4.0reboiler duty [MJ/kg CO2]

2.00.0 1.0 2.0 3.0 4.0 5.0

Liquid/Gas ratio [kg/kg]

2.00.0 1.0 2.0 3.0 4.0 5.0

Liquid/Gas ratio [kg/kg]


Absorbent stability/robustnessFormate Oxalate Total heat stable saltsFormate Oxalate Total heat stable salts 6060

1500

2000

2500

3000

3500

4000

Concentration [ppm]

1500

2000

2500

3000

3500

4000

Concentration [ppm] MEA

20

30

40

50

Ammonia Concentration

[ppm]20

30

40

50

Ammonia Concentration

[ppm]

0

500

1000

0 200 400 600 800 1000Duration [h]

0

500

1000

0 200 400 600 800 1000Duration [h]

0

10

0 200 400 600 800 1000Duration [h]

0

10

0 200 400 600 800 1000Duration [h]

15

20

25

30

Ammonia concentration 15

20

25

30

Ammonia concentration 800

1000

1200

1400

C t ti

Formate Sulphate Heat stable salts

800

1000

1200

1400

C t ti

Formate Sulphate Heat stable salts

Blend 5

0

5

10

0 100 200 300 400

[ppm]

0

5

10

0 100 200 300 400

[ppm]

0

200

400

600

800

0 100 200 300 400

Concentration [ppm]

0

200

400

600

800

0 100 200 300 400

Concentration [ppm]

12 |

Duration [h]Duration [h]Duration [h]Duration [h]

Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China | Ashleigh Cousins

Results Blend 6

Period 1 Period 2Period 1 Period 2Lean amine concentration Wash water concentrationLean amine concentration Wash water concentration

6

7

8

Specific 6

7

8

Specific 25

30

35

40

45

25

30

35

40

45

3

4

5reboiler duty[MJ/kg CO2]

3

4

5reboiler duty[MJ/kg CO2]

5

10

15

20

25Concentration [wt%]

5

10

15

20

25Concentration [wt%]

32 3 4 5 6 7 8

L/G ratio [kg/kg]

32 3 4 5 6 7 8

L/G ratio [kg/kg]

00 100 200 300 400

Duration [h]

00 100 200 300 400

Duration [h]


Summary of project results and learnings• A new PCC pilot plant facility was established at Huaneng Changchun• A new PCC pilot plant facility was established at Huaneng Changchun thermal power plant in Jilin

• Two novel liquid formulations were successfully trialled in China with a reduction in reboiler duty of 25% achieved

• Value of CSIRO methodology for liquid absorbent formulation was demonstrateddemonstrated

• A range of practical issues were identified and addressed in project with some issues requiring further research– Anti‐foam addition removed foaming issues

– Optimisation of solvent blends to lower risk of precipitation and vapour pressure

d bl d d f b b h l– Consider more suitable design and operating strategies for absorber wash column


Acknowledgement: This work was supported by the Australian Government through the Australia‐China Joint Coordination Group on Clean Coal Technology (JCG). The views expressed herein p gy ( ) pare not necessarily the views of the Commonwealth, and the Commonwealth does not accept responsibility for any information or advice contained herein.

CSIRO EnergyCSIRO Energy

Ashleigh Cousins

e [email protected] [email protected] http://www.csiro.au/en/Research/EF/Areas/Coal‐mining/Carbon‐capture‐and‐storage.html

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