Energy Minimization in Piperazine Promoted MDEA-Based CO 2 Capture Process

Bilal Alam Khan, Asad Ullah, Muhammad Wajid Saleem, Abdullah Nawaz Khan, Muhammad Faiq and Mir Haris
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Bilal Alam Khan: Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
Asad Ullah: Department of Mechanical Engineering, Baluchistan university of Information & Technology, Engineering and Management Sciences (BUITEMS), Quetta 87300, Pakistan
Muhammad Wajid Saleem: Department of Mechanical Engineering, University of Engineering and Technology (UET) Lahore, Lahore 54890, Pakistan
Abdullah Nawaz Khan: Department of Mechanical Engineering, Baluchistan university of Information & Technology, Engineering and Management Sciences (BUITEMS), Quetta 87300, Pakistan
Muhammad Faiq: Department of Mechanical Engineering, Baluchistan university of Information & Technology, Engineering and Management Sciences (BUITEMS), Quetta 87300, Pakistan
Mir Haris: Department of Mechanical Engineering, Baluchistan university of Information & Technology, Engineering and Management Sciences (BUITEMS), Quetta 87300, Pakistan

Sustainability, 2020, vol. 12, issue 20, 1-13

Abstract: A piperazine (PZ)-promoted methyldiethanolamine (MDEA) solution for a carbon dioxide (CO 2 ) removal process from the flue gas of a large-scale coal power plant has been simulated. An Aspen Plus ® was used to perform the simulation process. Initially, the effects of MDEA/PZ concentration ratio and stripper pressure on the regeneration energy of CO 2 capture process were investigated. The MDEA/PZ concentration ratio of 35/15 wt.% (35 wt. MDEA and 15 wt.% PZ) was selected as an appropriate concentration. The reboiler duty of 3.235 MJ/kg CO 2 was obtained at 35/15 wt.% concentration ratio of MDEA/PZ. It was considered a reference or base case, and process modifications including rich vapor compression (RVC) process, cold solvent split (CSS), and the combination of both processes were investigated to check its effect on the energy requirement. A total equivalent work of 0.7 MJ e /kg CO 2 in the RVC and a reboiler duty of 2.78 MJ/kg CO 2 was achieved in the CSS process. Similarly, the total equivalent work, reboiler duty, and condenser duty of 0.627 MJ e /kg CO 2 , 2.44 MJ/kg CO 2 , and 0.33 MJ/kg CO 2 , respectively, were obtained in the combined process. The reboiler duty and the total equivalent work were reduced by about 24.6 and 16.2%, respectively, as compared to the reference case. The total energy cost saving was 1.79 M$/yr. Considering the additional equipment cost in the combined process, the total cost saving was 0.67 M$ per year.

Keywords: CO 2 capture process; energy reduction; rich vapor compression process; solvent split (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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