Comparative evaluation of a new liquid absorbent in a

Transcription

1 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China PCCC3, Regina, September 2015 ENERGY 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

2 PCC3 China: Project Objectives and Approaches What? 1. Reducing energy penalty of PCC 2. Reducing costs for PCC How? 1. New liquid absorbent formulations 2. PCC Process modifications Dave et al. 2011, Energy Procedia 4, Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

3 Properties of the ideal liquid absorbent for PCC Not only: High cyclic capacity High g rates of absorption Low desorption energy requirement But also: Low cost Resistance to oxidation Resistance to other routes for degradation No impact of O 2, SO x, NO x and fly ash No corrosion issues No concerns around health, safety andenvironment 3 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

4 Process focused liquid absorbent formulation Mass Transfer relative e to 4.9 M MEA α rich at 5 kpa CO 2 and 313 K, Reboiler temperature max. 150 o C M MEA 3 M AMP M DEA 3 M MDEA 1 M PZ Blend Blend 2 Blend Blend 4 Blend Blend Minimum Reboiler Energy Requirement relative to 4.9 M MEA Characterised in this project: 15 primary amines excl. MEA, AMP 2 secondary amines excl. PZ, DEA 11 tertiary amines excl. TEA, MDEA No diamines No ammonia In process development facility: Blend 3/4: I + II In pilot plant in China: Blend 5/6: I + I 4 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

5 Pilot plant validation in China 5 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

6 Huaneng Changchun CO 2 capture Pilot plant 6 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

7 Pilot plant design information Gas flow: up to 900 kg/h Gas temperature: o C Liquid flow: up to 5 m 3 /h Columns Pipe size Packing Packing height material DCC DN m RSP250 Absorber DN m RSP250 Wash DN m RSP250 Stripper DN m RSP250 7 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

8 PCC Pilot plant campaigns Liquid absorbent MEA Blend 5 Blend 6 Duration (h) Average SO 2 content at inlet < 1 ppm ~ 3 ppm ~ 5 ppm Average NO x content at inlet ~ 70 ppm ~ 25 ppm ~ 15 ppm Range CO 2 content [%] Range O 2 content [%] CO 2 removal [%] 91 ±3 90 ±1 90 ±1 2 Liquid gas ratio range [kg/kg] Bottom temperature stripper [ o C] ~ 120 ~ 120 ~ Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

9 Reboiler duty for MEA campaigns 20.5 % MEA 17.6 % MEA CO2 content t % CO2 content t % 12 0% CO2 content % CO2 content % 12 0% CO2 content % Process simulation CO2 content 12% CO2 content % Process simulation CO2 content 12% Specific Reboiler 5.0 duty [MJ/kg CO 2 ] L/G [kg/kg] Specific Reboiler 5.0 duty [MJ/kg CO 2 ] L/G [kg/kg] 9 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

10 Results Blend 5 Lean solution concentration Wash water concentration Period 2 Period Concentration 40 [wt%] 30 Specific reboiler duty [MJ/kg CO 2 ] Duration [h] L/G [kg/kg] 10 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

11 Reboiler duty comparison MEA vs Blend 5 MEA Blend 5 MEA modelling Specific reboiler duty [MJ/kg CO 2 ] Liquid/Gas ratio [kg/kg] 11 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

12 Absorbent stability/robustness Formate Oxalate Total heat stable salts Ammonia Concentration Concentration [ppm] [ppm] MEA Duration [h] Duration [h] Formate Sulphate Heat stable salts Concentration ti 800 [ppm] Blend 5 20 Ammonia concentration 15 [ppm] Duration [h] Duration [h] 12 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

13 Results Blend 6 Lean amine concentration Wash water concentration Concentration 25 [wt%] Duration [h] 8 7 Specific 6 reboiler duty [MJ/kg CO 2 ] Period 1 Period L/G ratio [kg/kg] 13 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

14 Summary of project results and learnings 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 demonstrated 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 Consider more suitable design and operating strategies for absorber b wash column 14 Comparative evaluation of a new liquid absorbent in a PCC pilot plant in China Ashleigh Cousins

15 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 are not necessarily the views of the Commonwealth, and the Commonwealth does not accept responsibility for any information or advice contained herein. CSIRO Energy Ashleigh Cousins e w ashleigh.cousins@csiro.au mining/carbon capture and storage.html ENERGY FLAGSHIP