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2 Sequestration
Published in S. Komar Kawatra, Advanced Coal Preparation and Beyond, 2020
The simplest method is post-combustion capture. Once combustion proceeds, simply separate the CO2 from the flue gases before they are released from the atmosphere. The largest advantage of post-combustion capture is that it does not require a major redesign of existing facilities, and can be installed as a simple tail unit. The disadvantage of post-combustion capture is that it must take place somewhat close to atmospheric pressure, working with relatively dilute CO2 streams. The stripper column and subsequent compression step typically require a significant portion of a power plant’s output. In the case of a coal-fired facility the worst-case scenario may be as much as one-third of the total power output, resulting in a 70% increase in electricity costs.
EEMS2015 organizing committee
Published in Yeping Wang, Jianhua Zhao, Advances in Energy, Environment and Materials Science, 2018
There are various technologies available for the separation of CO2 from the flue gas of conventional fossil fuel fired power plants, e.g., chemical absorp- tion, physical absorption, cryogenic methods, mem- brane separation, and biological fixation (Um et al., 2003). Chemical absorption process is generally recognized as the most effective technology (Rao and Rubin, 2002). Many solvents have gained wide- spread acceptance as viable solvents for pre and post combustion capture of CO2, but the most effective solvents are generally considered to be potassium car- bonate solvents or aqueous alkanolamines, includ- ing Monoethanolamine (MEA), Diethanolamine (DEA), N-Methyldiethanolamine (MDEA), Di-2- Propanolamine (DIPA) and so on (Choi et al., 2009; Ghosh, Kentish and Stevens, 2009).
2 to Basic Chemicals and Fuels
Published in Ashok Kumar, Swati Sharma, 2 Utilization, 2020
Saeed Sahebdelfar, Maryam Takht Ravanchi
Basically, CO2 capture can be classified into four main types: (i) pre-combustion, (ii) post-combustion, (iii) oxy-fuel combustion, and (iv) chemical looping combustion (CLC) capture (Cuellar-Franca and Azapagic, 2015). In the pre-combustion method, the fuel is first reformed to syngas (CO+H2), then treated by WGS, followed by the removal of CO2 (>20%, which facilitates its separation) and combustion of H2. Post-combustion capture involves the removal of CO2 from the flue gas (typically 3%–15% CO2) as in the conventional energy generation systems. In the oxy-fuel combustion process, the fuel (coal) is burnt with nearly pure O2 (>95%) mixed with steam or recycled flue gas (RFG).
Carbon-dioxide capture, storage and conversion techniques in different sectors – a case study
Published in International Journal of Coal Preparation and Utilization, 2023
Post-combustion capture, oxyfuel combustion, and pre-combustion capture are all methods of carbon capture. Flue gas CO2 content is low, yet substantially greater than ambient air. The energy cost of capturing CO2 increases with decreasing CO2 concentration. Therefore, CO2 capture is more efficient with combustion methods that produce highly concentrated or pureed CO2. One method is to use pure oxygen instead of air in the combustion process (oxyfuel). Oxyfuel combustion produces almost pure CO2, but other elements like water vapor must be eliminated. Pre-combustion carbon-free fuel conversion is a third option. Precombustion capture produces a clean CO2 stream. Solvent-based absorption, solid sorbent adsorption/absorption, membranes, cryogenics, and chemical looping are all used in CO2 capture technologies. Chemical absorption is one of the most extensively used technologies nowadays (Figure 7) (Cuéllar-Franca and Azapagic 2015).
Cultivation of Nannochloropsis algae for simultaneous biomass applications and carbon dioxide capture
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Abdul Hai Alami, Muhammad Tawalbeh, Shamma Alasad, Mennatalah Ali, Maitha Alshamsi, Haya Aljaghoub
Post-combustion capture of CO2 is a process that utilizes technologies such as absorption, adsorption, membrane separation, and micro algal bio-fixation to separate and capture CO2 from flue gasses (Pandey et al. 2010). Pre-combustion capture is the process of capturing CO2 from conventional fuels before combustion is completed. Oxy-fuel combustion is the process of using oxygen to burn coal and petroleum by products and obtain a flue gas containing only CO2 and H2O (Eldardiry and Habib 2018). Other notable carbon sequestration technologies include the production of char from biowaste as discussed in the work of Maroušek et al. (Maroušek et al. 2020) and sorbents recovered from sludge water (Stávková and Maroušek 2021).
Dispersion of the Rayleigh light-scattering virial coefficients and polarisability anisotropy of CO2
Published in Molecular Physics, 2019
Prathapa C. Balachandran Pillai, Vincent W. Couling
The electric properties of the carbon dioxide molecule continue to attract attention for reasons such as its considerable environmental importance. Release of this greenhouse gas into the atmosphere through the combustion of fossil fuels contributes to global climate change, hence a growing body of research into the post-combustion capture of CO [5,6]. Since the electric quadrupole moment and electric dipole polarisability of CO are both appreciable, the molecule is able to bind preferentially to adsorbents compared to other atmospheric constituents [7-9].