- Title
- Advancement of ammonia based post-combustion CO₂ capture using the advanced flash stripper process
- Creator
- Jiang, Kaiqi; Li, Kangkang; Yu, Hai; Chen, Zuliang; Wardhaugh, Leigh; Feron, Paul
- Relation
- Applied Energy Vol. 202, p. 496-506
- Publisher Link
- http://dx.doi.org/10.1016/j.apenergy.2017.05.143
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2017
- Description
- The energy consumption associated with absorbent regeneration remains the most critical challenge for the industrial implementation of chemisorption based CO₂ capture processes. Aimed at reducing the energy consumption, this paper proposes a promising process modification of the ammonia (NH₃) based CO₂ capture process that involves an advanced flash stripper with a cold rich split. We investigated the techno-economic performance of the advanced NH₃ process integrated with a 650 MW coal-fired power plant, and evaluated it technical and energy performance using a rigorous, rate-based model in Aspen Plus. A sensitivity study was also performed to optimise the modelling parameters, i.e. the stripper pressure and the absorbent NH₃ concentration, and minimize the regeneration duty. A very competitive regeneration duty of 1.86 MJ/kg CO₂ was achieved for an optimised stripper pressure of 12 bar and an NH₃ concentration of 10.2 wt%, with a total equivalent work of 0.164 MW h/t CO₂ for absorbent pumping, NH₃ regeneration and CO₂ compression. We also used a validated economic model to estimate the capital investment of the advanced NH₃ process and its corresponding economic performance. With its significant reduction in energy consumption, the proposed process was economically competitive with CO₂ avoided cost was as low as US$40.7/t CO₂. This was 34% and 44% less than the reference NH₃ and monoethanolamine (MEA) processes, respectively. The advanced NH₃ based flash stripper also had technical and economic advantages over other amine absorbents, such as MEA and piperazine (PZ), as well as other advanced stripper modifications, such as inter-heating process, revealing its process viability in commercial application.
- Subject
- flash stripper; energy reduction; economic evaluation; NH₃; CO₂ capture
- Identifier
- http://hdl.handle.net/1959.13/1386196
- Identifier
- uon:32376
- Identifier
- ISSN:0306-2619
- Language
- eng
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