Superior energy-saving splitter in monoethanolamine-based biphasic solvents for CO2 capture from coal-fired flue gas

Wang, Rujie; Liu, Shanshan; Wang, Lidong; Li, Qiangwei; Zhang, Shihan; Chen, Bin; Jiang, Lei; Zhang, Yifeng

doi:10.1016/j.apenergy.2019.03.138

Cited by 143 publications

(40 citation statements)

References 54 publications

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“…Syngas is first produced by the steam methane reforming or coal gasification process, and then converted to a mixture containing H 2 , CO 2 , CH 4 , CO, H 2 O, and hydrocarbons by water-gas shift reaction [3,4]. Solvent absorption is the most well-developed process to capture CO 2 and obtain pure H 2 [5]. However, the concentration of CO 2 in the shifted syngas may be high (up to 45%), which would require large equipment and high energy consumption for desorption [6].…”

Section: Introductionmentioning

confidence: 99%

Efficiency Separation Process of H2/CO2/CH4 Mixtures by a Hollow Fiber Dual Membrane Separator

et al. 2020

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Hydrogen purification and CO2 capture are of great significance in refineries and pre-combustion power plants. A dual membrane separator offers an alternative approach for improving H2/CO2 separation efficiency. In this work, H2/CO2/CH4 ternary gas mixtures separation can be achieved by a dual membrane separator with an integrated polyimide (PI) membrane and polydimethylsiloxane/polyetherimide (PDMS/PEI) composite membrane. A hollow fiber dual membrane separation equipment is designed and manufactured. Through the self-designed device, the effects of stage cut, operating temperature, operating pressure, and membrane area ratio on separation performance of dual membrane separator have been studied. The results indicate that, at a high stage cut, a dual membrane separator has obvious advantages over a single membrane separator. Operating temperature has a significant impact on gas permeation rates. At 25 °C, a dual membrane separator can obtain the highest purity of H2 and CO2. By increasing operating pressure, the purity and recovery of H2 and CO2 can be improved simultaneously. The effect of the membrane area ratio on the performance of the dual membrane separator was studied. When the permeate flows of two membranes are approximately equal by changing the membrane area ratio, the overall performance of the dual membrane separator is the best. On the basis of its synergy in promoting separation, the dual membrane separator holds great industrial application potential.

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Section: Introductionmentioning

confidence: 99%

Efficiency Separation Process of H2/CO2/CH4 Mixtures by a Hollow Fiber Dual Membrane Separator

et al. 2020

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“…By applying the optimal operating policies suggested by the model, a theoretical energy reduction of up to 68% was achieved compared against the base case experimental data. Nevertheless, more realistic industrial data indicate that the energy required by the reboiler in conventional amines‐CO 2 processes is around 4 GJ/tonCO 2 28 . In our work, we found that this ratio could be reduced until 2.97 GJ/tonCO 2 with a CO 2 removal efficiency of 90%.…”

Section: Discussionmentioning

confidence: 56%

Optimization of the amines‐CO₂ capture process by a nonequilibrium rate‐based modeling approach

López‐Bautista

Flores‐Tlacuahuac

2020

AIChE Journal

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Amine-based chemical absorption has become the most mature technology among carbon dioxide capture processes, featuring the advantages of high separation efficiencies and its simplicity to attach it to existent industrial facilities. Nevertheless, further improvements on its performance are required in order to implement this technology to a wider extent. Energy expenditure at the solvent regeneration unit has been remarked as the major drawback of the process under discussion; therefore, the main objective of this work is to compute optimal operating policies which ensure minimum heat load at the reboiler along with reasonable removal efficiencies. A deterministic mathematical model of a reported pilot plant was deployed as the basis for the nonlinear programming optimization formulations, using a rate-based approach and an eNRTL thermodynamic framework. Several optimization scenarios were studied to account for diverse capture targets and degrees of freedom. Furthermore, sensitivity analyses were performed to understand the stand-alone effect of some variables on the process. Results reflect the importance of optimizing the complete plant to account for significant interactions between variables, as well as choosing an operational arrangement according to the separation goal demanded. K E Y W O R D S carbon dioxide capture, monoethanolamine, nonlinear programming

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“…The upwind finite difference method was applied to solve Equation (9). The validation of the models was investigated and discussed in previous works [23][24][25][26][27].…”

Section: Modeling Of Membrane Gas Separationmentioning

confidence: 99%

Conceptual Design of Pyrolytic Oil Upgrading Process Enhanced by Membrane-Integrated Hydrogen Production System

et al. 2019

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Hydrotreatment is an efficient method for pyrolytic oil upgrading; however, the trade-off between the operational cost on hydrogen consumption and process profit remains the major challenge for the process designs. In this study, an integrated process of steam methane reforming and pyrolytic oil hydrotreating with gas separation system was proposed conceptually. The integrated process utilized steam methane reformer to produce raw syngas without further water–gas-shifting; with the aid of a membrane unit, the hydrogen concentration in the syngas was adjusted, which substituted the water–gas-shift reactor and improved the performance of hydrotreater on both conversion and hydrogen consumption. A simulation framework for unit operations was developed for process designs through which the dissipated flow in the packed-bed reactor, along with membrane gas separation unit were modeled and calculated in the commercial process simulator. The evaluation results showed that, the proposed process could achieve 63.7% conversion with 2.0 wt% hydrogen consumption; the evaluations of economics showed that the proposed process could achieve 70% higher net profit compared to the conventional plant, indicating the potentials of the integrated pyrolytic oil upgrading process.

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Superior energy-saving splitter in monoethanolamine-based biphasic solvents for CO2 capture from coal-fired flue gas

Cited by 143 publications

References 54 publications

Efficiency Separation Process of H2/CO2/CH4 Mixtures by a Hollow Fiber Dual Membrane Separator

Efficiency Separation Process of H2/CO2/CH4 Mixtures by a Hollow Fiber Dual Membrane Separator

Optimization of the amines‐CO₂ capture process by a nonequilibrium rate‐based modeling approach

Conceptual Design of Pyrolytic Oil Upgrading Process Enhanced by Membrane-Integrated Hydrogen Production System

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Superior energy-saving splitter in monoethanolamine-based biphasic solvents for CO2 capture from coal-fired flue gas

Cited by 143 publications

References 54 publications

Efficiency Separation Process of H2/CO2/CH4 Mixtures by a Hollow Fiber Dual Membrane Separator

Efficiency Separation Process of H2/CO2/CH4 Mixtures by a Hollow Fiber Dual Membrane Separator

Optimization of the amines‐CO2 capture process by a nonequilibrium rate‐based modeling approach

Conceptual Design of Pyrolytic Oil Upgrading Process Enhanced by Membrane-Integrated Hydrogen Production System

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Optimization of the amines‐CO₂ capture process by a nonequilibrium rate‐based modeling approach