Sodium carbonate-based post combustion carbon capture utilising trona as main sorbent feed stock

Fabio Furcas, Wanawan Pragot, Ricardo Chacartegui, Waheed Afzal* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In the pursuit of shifting technology towards sustainable, environmentally benign processes, post-combustion carbon capture technology is recognised to be a timely mitigation option. This paper presents the development of a novel sodium carbonate-based post combustion carbon capture process utilising the carbonate mineral trona (trisodium hydrogendicarbonate dihydrate) as main sorbent feedstock source. The energy penalty, the fraction of energy sacrificed to capture CO2 relative to the net energy produced serves as main performance indicator. Investigations on the correlative relationship between energy penalty as a function of capture efficiency are carried out by retrofitting the process to a 600 MW reference coal-fired power plant. The energy penalty of the global system features a distinct local minimum of 3.99 %, corresponding to a CO2 capture efficiency of 90.00 % and a CO2 outlet purity of 99.90%. The Specific Primary Energy Consumption for CO2 Avoided (SPECCA) index corresponding to this minimum is evaluated to be SPECCA = 0.514 MJ kg CO2−1. Sensitivity analyses on the effect of increasingly high SO2 flue gas volume fractions ySO2 show that the capture efficiency is virtually unimpaired for calcination temperatures of 190 ≤ T ≤ 280 ◦C and ySO2 ranging from 0.50 to 0.70 %. Whilst commercially available CO2 capture technology is energy intense and prone to sorbent degradation, the process developed retains high capture efficiencies of calcium oxide-based looping cycles at low operating temperatures and eliminates the predisposition of amine-based sorbents utilised in scrubbing capture schemes to deplete due to the presence of SO2 in the inlet flue gas stream. It can be concluded that sodium carbonate based post-combustion capture processes are a competitive alternative to existing CO2 capture technologies.
Original languageEnglish
JournalEnergy Conversion and Management
Publication statusAccepted/In press - 6 Jan 2020

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Carbon capture
Sorbents
Carbonates
Sodium
Flue gases
Carbonate minerals
Lime
Calcination
Feedstocks
Amines
Volume fraction
Power plants
Coal
Degradation
Temperature

Keywords

  • carbon capture
  • carbonate looping process
  • Trona
  • sodium carbonate
  • sodium bicarbonate

Cite this

Sodium carbonate-based post combustion carbon capture utilising trona as main sorbent feed stock. / Furcas, Fabio; Pragot, Wanawan; Chacartegui, Ricardo; Afzal, Waheed (Corresponding Author).

In: Energy Conversion and Management, 06.01.2020.

Research output: Contribution to journalArticle

Furcas, Fabio ; Pragot, Wanawan ; Chacartegui, Ricardo ; Afzal, Waheed. / Sodium carbonate-based post combustion carbon capture utilising trona as main sorbent feed stock. In: Energy Conversion and Management. 2020.
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AB - In the pursuit of shifting technology towards sustainable, environmentally benign processes, post-combustion carbon capture technology is recognised to be a timely mitigation option. This paper presents the development of a novel sodium carbonate-based post combustion carbon capture process utilising the carbonate mineral trona (trisodium hydrogendicarbonate dihydrate) as main sorbent feedstock source. The energy penalty, the fraction of energy sacrificed to capture CO2 relative to the net energy produced serves as main performance indicator. Investigations on the correlative relationship between energy penalty as a function of capture efficiency are carried out by retrofitting the process to a 600 MW reference coal-fired power plant. The energy penalty of the global system features a distinct local minimum of 3.99 %, corresponding to a CO2 capture efficiency of 90.00 % and a CO2 outlet purity of 99.90%. The Specific Primary Energy Consumption for CO2 Avoided (SPECCA) index corresponding to this minimum is evaluated to be SPECCA = 0.514 MJ kg CO2−1. Sensitivity analyses on the effect of increasingly high SO2 flue gas volume fractions ySO2 show that the capture efficiency is virtually unimpaired for calcination temperatures of 190 ≤ T ≤ 280 ◦C and ySO2 ranging from 0.50 to 0.70 %. Whilst commercially available CO2 capture technology is energy intense and prone to sorbent degradation, the process developed retains high capture efficiencies of calcium oxide-based looping cycles at low operating temperatures and eliminates the predisposition of amine-based sorbents utilised in scrubbing capture schemes to deplete due to the presence of SO2 in the inlet flue gas stream. It can be concluded that sodium carbonate based post-combustion capture processes are a competitive alternative to existing CO2 capture technologies.

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