Capital costs and energy considerations of different alternative stripper configurations for post combustion CO2 capture

Karimi, Mehdi; Hillestad, Magne; Svendsen, Hallvard F.

doi:10.1016/j.cherd.2011.03.005

Cited by 144 publications

(104 citation statements)

References 8 publications

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“…The Kent-Eisenberg model gave slightly higher heat consumption. The standard process gives a lower value than in most references [7,9,13,17], and as mentioned earlier, this can be explained by a high number of stages, a low temperature difference and a low removal grade.…”

Section: Energy Comparisons Of the Alternativesmentioning

confidence: 82%

“…The vapour recompression case has been calculated by Karimi et al [9] who calculated a reboiler duty of 2.6 MJ/kg CO 2 using the program Unisim compared to a base case using 3.5 MJ/kg CO 2 captured from a coal based power plant. The values in this work are close to Karimi's values.…”

Section: Energy Comparisons Of the Alternativesmentioning

confidence: 99%

“…Rate-based Aspen Plus simulations for such processes have been performed by Cousins et al [7], and Fernandez et al [8] have also performed cost estimation based on Aspen Plus simulations. Simulations with the process simulation programs Unisim and ProTreat followed by economical calculations have been performed by Karimi et al [9].…”

Section: Literature On Alternative Process Configurations For Co 2 Abmentioning

confidence: 99%

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Optimization of Configurations for Amine based CO2 Absorption Using Aspen HYSYS

et al. 2014

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The drawback with an absorption based CO 2 capture process is the large heat consumption needed for desorption. Different absorption and desorption configurations for 85 % amine based CO 2 removal from a natural gas based power plant have been simulated using Aspen HYSYS. A standard process, split-stream, vapour recompression and different combinations thereof have been simulated. The simulations have been used as a basis for equipment dimensioning, cost estimation and process optimization. Of the evaluated cases, a simple vapour recompression case has been calculated to be the most cost optimum configuration.

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Section: Energy Comparisons Of the Alternativesmentioning

confidence: 82%

Section: Energy Comparisons Of the Alternativesmentioning

confidence: 99%

Section: Literature On Alternative Process Configurations For Co 2 Abmentioning

confidence: 99%

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Optimization of Configurations for Amine based CO2 Absorption Using Aspen HYSYS

et al. 2014

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“…In this context, the post-combustion CO2 capture process by chemical absorption appears to be one of the CO2 capture technology that is close to an industrial deployment. Nevertheless, there is still a need for new solvents that can replace the conventional ones, such as for example the aqueous solution of monoethanolamine (MEA), especially to reduce the operating costs of the process, the main part of these costs being linked to the heating energy needed for the solvent regeneration at the stripper (around 3.5 GJ/tCO2 [1][2][3] for the benchmark MEA 30%)…”

Section: Introductionmentioning

confidence: 99%

Screening tests of new hybrid solvents for the post-combustion CO2 capture processby chemical absorption

2014

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This study focused on the screening of new hybrid solvents (mixture of a chemical (usually an amine) and a physical (ether, alcohol, etc.) solvent) for the post-combustion CO2 capture process by chemical absorption. Such scrubbing solutions aim at combining the advantages of the two components, namely: a low regeneration energy and a high absorption capacity of the physical solvent at intermediate CO2 partial pressures, a better absorption performances of the chemical solvent at low CO2 partial pressures and also high absorption kinetics due to chemical reactions with CO2. The innovative aspect of our approach was based on the use of acetals as physical components of the hybrid solvent. The purpose of our study was to characterize and compare these new hybrid solvents in terms of absorption and regeneration performances using two types of screening tests. Different blended solutions (composed of a conventional amine such as monoethanolamine (MEA), diethanolamine (DEA), 2-amino-2-methyl-1-propanol (AMP)) and an acetal compound such as 2,5,7,10-tetraoxaundecane (TOU) were tested. Regarding the absorption performances, a double stirred cell reactor was used to compare the absorption efficiencies of the solvents at 298 K. It was observed that the addition of the acetal compound improves significantly the absorption efficiencies, especially at the beginning of the batch absorption test, namely at low CO2 loadings of the solution. Meanwhile, regeneration tests were performed using a regeneration cell allowing to compare the regeneration efficiency of the solvents at fixed heating power (600 W). The higher cyclic capacities and better regeneration efficiencies with acetals base solvents were also highlighted. Globally, this work confirms through this first step that new hybrid solvents, composed of amine(s) and acetal, could be a very promising alternative to classical solvents. NomenclatureA [%] CO2 absorption ratio of the scrubbing solution CCO2 [mol m -3 ] CO2 concentration of the scrubbing solution GCO2,in [m³ s -1 ] CO2 gas flow rate at the inlet of the gas-liquid contactor GCO2,out [m³ s -1 ] CO2 gas flow rate at the outlet of the gas-liquid contactor IC [kg m -3 ] inorganic carbon content of the scrubbing solution t [s] time yCO2,in [vol.%] CO2 volume fraction of the gas phase at the inlet of the gas-liquid contactor yCO2,out [vol.%] CO2 volume fraction of the gas phase at the outlet of the gas-liquid contactor ηregen [%] regeneration efficiency of the scrubbing solution

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“…32,33,35,37,48 In this process concept, illustrated in Figure 2, the lean stream that leaves the stripper column is flashed adiabatically in a separate vessel. As a consequence of the pressure reduction, the solvent is partially evaporated.…”

Section: Lean Vapor Compression (Lvc)mentioning

confidence: 99%

Analysis of Process Configurations for CO₂ Capture by Precipitating Amino Acid Solvents

Fernández

Heffernan

Ham

et al. 2014

Ind. Eng. Chem. Res.

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Precipitating amino acid solvents are an alternative to conventional amine scrubbing for CO 2 capture from flue gas. Process operation with these solvents leads to the formation of precipitates during absorption that need to be re-dissolved prior to desorption of CO 2 . The process configuration is crucial for the successful application of these solvents. Different process configurations have been analyzed in this work, including a full analysis of the baseline operating conditions (based on potassium taurate), the addition of lean vapor compression, multiple absorber feeds, and the use of different amino acids as alternative solvents to the baseline based on potassium taurate. The analysis is carried out with an equilibrium model of the process that approximates the thermodynamics of the solvents considered. The results show that the precipitating amino acid solvents can reduce the reboiler duty needed to regenerate the solvent with respect to a conventional MEA process. However, this reduction is accompanied by an expenditure in lower grade energy needed to dissolve the precipitates. To successfully implement these processes into power plants, an internal recycle of the rich stream is necessary. This configuration, known as DECAB Plus, can lower the overall energy use of the capture process, which includes the energy needed to regenerate the solvent, the energy needed to dissolve the precipitates, and the energy needed to compress the CO 2 to 110 bar. With respect to the energy efficiency, the DECAB Plus with lean vapor compression configuration is the best configuration based on potassium taurate, which reduces the reboiler duty for regeneration by 45% with respect to conventional MEA. Retrofitting this process into a coal fired power plant will result in overall energy savings of 15% with respect to the conventional MEA process, including compression of the CO 2 stream to 110 bar. Potassium alanate was found to reduce the energy use with respect to potassium taurate under similar process configurations. Therefore, the investigation of potassium alanate in a DECAB Plus configuration is highly recommended, since it can reduce the energy requirements of the best process configuration based on potassium taurate.

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Capital costs and energy considerations of different alternative stripper configurations for post combustion CO2 capture

Cited by 144 publications

References 8 publications

Optimization of Configurations for Amine based CO2 Absorption Using Aspen HYSYS

Optimization of Configurations for Amine based CO2 Absorption Using Aspen HYSYS

Screening tests of new hybrid solvents for the post-combustion CO2 capture processby chemical absorption

Analysis of Process Configurations for CO₂ Capture by Precipitating Amino Acid Solvents

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Capital costs and energy considerations of different alternative stripper configurations for post combustion CO2 capture

Cited by 144 publications

References 8 publications

Optimization of Configurations for Amine based CO2 Absorption Using Aspen HYSYS

Optimization of Configurations for Amine based CO2 Absorption Using Aspen HYSYS

Screening tests of new hybrid solvents for the post-combustion CO2 capture processby chemical absorption

Analysis of Process Configurations for CO2 Capture by Precipitating Amino Acid Solvents

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Analysis of Process Configurations for CO₂ Capture by Precipitating Amino Acid Solvents