SIMULATION AND OPTIMIZATION OF CARBON CAPTURE IN COAL-FIRED FLUE GAS

BAI Yongfeng; WANG Zhengrong; ZHAN Guoxiong; CHEN Zhen; LI Junhua

doi:10.13205/j.hjgc.202309008

Volume 41 Issue 9

Sep. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(9): 61-71

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BAI Yongfeng, WANG Zhengrong, ZHAN Guoxiong, CHEN Zhen, LI Junhua. SIMULATION AND OPTIMIZATION OF CARBON CAPTURE IN COAL-FIRED FLUE GAS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(9): 61-71. doi: 10.13205/j.hjgc.202309008

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SIMULATION AND OPTIMIZATION OF CARBON CAPTURE IN COAL-FIRED FLUE GAS

doi: 10.13205/j.hjgc.202309008

1. School of Environment, Tsinghua University, Beijing 100084, China;
2. China Huadian Engineering Corporation Limited, Beijing 100160, China

Received Date: 2023-04-03
Available Online: 2023-11-15

Abstract

Abstract

A 10000 t/a amine-based carbon capture device was designed and constructed in a power plant, using blend amine solvent. Under the design conditions, the flue gas flow was 5877 Nm³/h, the solvent circulating flow was 37500 kg/h, the capture efficiency reached 97% above, and the CO₂ output was not less than 1.39 t/h; the energy consumption for solvent regeneration decreased by 23%, compared with the traditional monoethanolamine (MEA) solvent. According to the engineering design parameters, the detailed carbon capture process was modelled, and the results reveal relative error was less than 3%, between the key parameters of the modelling and the engineering values. Furthermore, some energy-saving technologies were designed and investigated, including liquid-rich separation, interstage cooling and MVR flash. The effects of energy-saving process parameters were comprehensively explored, such as liquid-rich separation rate, interstage cooling rate and vacuum degree on energy consumption and benefits of the carbon capture system. The results showed that MVR technology could reduce the energy consumption of capture by 15.45%, and then the energy-saving effect was the best, the energy-saving effect of rich liquid diversion and interstage cooling was in a range of 2% to 4.5%. The energy-saving effect was further improved by the combined use of various technologies and optimization of operating parameters. Their energy-saving effect ranked as:interstage cooling+MVR heat pump technology>rich liquid shunt+MVR heat pump technology>energy-saving effect of interstage cooling+rich liquid shunt. The results of this study could provide some guidance for the process system design, energy saving and operation of flue gas carbon capture projects in coal-fired power plants.
- carbon capture,
- organic amine absorption,
- Aspen Plus,
- numerical simulation,
- energy saving technology,
- operational optimization

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References

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