scholarly journals Performance of Li4SiO4 Material for CO2 Capture: A Review

2019 ◽  
Vol 20 (4) ◽  
pp. 928 ◽  
Author(s):  
Xianyao Yan ◽  
Yingjie Li ◽  
Xiaotong Ma ◽  
Jianli Zhao ◽  
Zeyan Wang
Keyword(s):  
Co2 Capture ◽  
Energy Production ◽  
Power Plants ◽  
Solid State Reaction Method ◽  
Absorption Capacity ◽  
Operating Conditions ◽  
Lithium Silicate ◽  
Co2 Absorption ◽  
Production Processes ◽  
Absorption Performance

Lithium silicate (Li4SiO4) material can be applied for CO2 capture in energy production processes, such as hydrogen plants, based on sorption-enhanced reforming and fossil fuel-fired power plants, which has attracted research interests of many researchers. However, CO2 absorption performance of Li4SiO4 material prepared by the traditional solid-state reaction method is unsatisfactory during the absorption/regeneration cycles. Improving CO2 absorption capacity and cyclic stability of Li4SiO4 material is a research highlight during the energy production processes. The state-of-the-art kinetic and quantum mechanical studies on the preparation and CO2 absorption process of Li4SiO4 material are summarized, and the recent studies on the effects of preparation methods, dopants, and operating conditions on CO2 absorption performance of Li4SiO4 material are reviewed. Additionally, potential research thoughts and trends are also suggested.

Why are Ionic Liquids Attractive for CO2 Absorption? An Overview

2009 ◽  
Vol 62 (4) ◽  
pp. 298 ◽  
Author(s):  
Junhua Huang ◽  
Thomas Rüther
Keyword(s):  
Ionic Liquids ◽  
Co2 Capture ◽  
Power Plants ◽  
Cost Effective ◽  
Absorption Capacity ◽  
Selective Absorption ◽  
Co2 Absorption ◽  
Co2 Solubility ◽  
Capture Process ◽  
Advantages And Disadvantages

As the climate debate is hotting up, so is the (re)search for finding powerful new materials for the efficient and cost-effective removal of CO2 from flue-gas streams from power plants and other emission sources. Ionic liquids (ILs), exhibiting higher CO2 solubility than conventional organic solvents, have received considerable interest as new CO2 absorbents. The present paper evaluates the advantages and disadvantages of ILs, and provides an overview of the recent developments of ILs for CO2 capture. In conventional ILs, CO2 is absorbed by occupying the free space between the ions through physical absorption mechanisms. As another promising strategy, task-specific ILs have been studied that, by attaching functional groups to the ions, allow the formation of chemical bonds to improve the overall absorption capacity during the CO2 capture process. Other strategies include using ILs as reaction media or as selective absorption materials.

scholarly journals A study on CO2 absorption using hybrid solvents in packed columns

2019 ◽  
Author(s):  
Ravinder Kumar ◽  
Mohammad Hossein Ahmadi ◽  
Dipen Kumar Rajak ◽  
Mohammad Alhuyi Nazari
Keyword(s):  
Carbon Dioxide ◽  
Co2 Capture ◽  
Power Plants ◽  
Large Scale ◽  
Carbon Dioxide Capture ◽  
Packed Column ◽  
Absorption Efficiency ◽  
Co2 Absorption ◽  
Process Industries ◽  
Carbon Dioxide Co2

Abstract Greenhouse gases emissions from large scale industries as well as gasoline based vehicles are mainly responsible for global warming since the 1980s. At present, it has triggered global efforts to reduce the level of GHG. The contribution of carbon dioxide (CO2) in polluting the environment is at a peak due to the excessive use of coal in power plants. So, serious attention is required to reduce the level of CO2 using advanced technologies. Carbon dioxide capture and storage may play an important role in this direction. In process industries, various carbon dioxide capture techniques can be used to reduce CO2 emissions. However, post-combustion carbon dioxide capture is on top priority. Nowadays the researcher is focusing their work on CO2 capture using hybrid solvent. This work highlights a review of carbon dioxide capture using various kind of hybrid solvent in a packed column. The various challenges for absorption efficiency enhancement and future direction are also discussed in the present work. It is concluded through the literature survey that hybrid solvent shows better efficiency in comparison to the aqueous solution used for CO2 capture.

scholarly journals Preliminary Performance and Cost Evaluation of Four Alternative Technologies for Post-Combustion CO2 Capture in Natural Gas-Fired Power Plants

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 543 ◽  
Author(s):  
Manuele Gatti ◽  
Emanuele Martelli ◽  
Daniele Di Bona ◽  
Marco Gabba ◽  
Roberto Scaccabarozzi ◽  
...  
Keyword(s):  
Supersonic Flow ◽  
Natural Gas ◽  
Co2 Capture ◽  
Power Plants ◽  
Combined Cycle ◽  
Cost Evaluation ◽  
Base Case ◽  
Co2 Absorption ◽  
Molten Carbonate ◽  
Energy Penalty

The objective of this study is to assess the technical and economic potential of four alternative processes suitable for post-combustion CO2 capture from natural gas-fired power plants. These include: CO2 permeable membranes; molten carbonate fuel cells (MCFCs); pressurized CO2 absorption integrated with a multi-shaft gas turbine and heat recovery steam cycle; and supersonic flow-driven CO2 anti-sublimation and inertial separation. A common technical and economic framework is defined, and the performance and costs of the systems are evaluated based on process simulations and preliminary sizing. A state-of-the-art natural gas combined cycle (NGCC) without CO2 capture is taken as the reference case, whereas the same NGCC designed with CO2 capture (using chemical absorption with aqueous monoethanolamine solvent) is used as a base case. In an additional benchmarking case, the same NGCC is equipped with aqueous piperazine (PZ) CO2 absorption, to assess the techno-economic perspective of an advanced amine solvent. The comparison highlights that a combined cycle integrated with MCFCs looks the most attractive technology, both in terms of energy penalty and economics, i.e., CO2 avoided cost of 49 $/tCO2 avoided, and the specific primary energy consumption per unit of CO2 avoided (SPECCA) equal to 0.31 MJLHV/kgCO2 avoided. The second-best capture technology is PZ scrubbing (SPECCA = 2.73 MJLHV/kgCO2 avoided and cost of CO2 avoided = 68 $/tCO2 avoided), followed by the monoethanolamine (MEA) base case (SPECCA = 3.34 MJLHV/kgCO2 avoided and cost of CO2 avoided = 75 $/tCO2 avoided), and the supersonic flow driven CO2 anti-sublimation and inertial separation system and CO2 permeable membranes. The analysis shows that the integrated MCFC–NGCC systems allow the capture of CO2 with considerable reductions in energy penalty and costs.

Pre-Combustion CO2 Capture Using Ceramic Absorbent and Methane Steam Reforming

2006 ◽  
Vol 317-318 ◽  
pp. 81-84 ◽  
Author(s):  
Masahiro Kato ◽  
Yukishige Maezawa ◽  
Shin Takeda ◽  
Yoshikazu Hagiwara ◽  
Ryosuke Kogo ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Co2 Capture ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Power Plants ◽  
Methane Steam Reforming ◽  
Lithium Silicate ◽  
Co2 Separation ◽  
Co2 Removal ◽  
Co2 Removal Efficiency

A novel CO2 separation technique that employs the chemical reaction of lithium-containing oxides with CO2 has been developed. Since this method is effective in the temperature range of 450oC to 700oC, it has the advantages of enabling CO2 separation in power plants without lowering the temperature and of absorbing CO2 from the steam-methane reforming process at the same time. Because the absorption is exothermic and the steam reforming is endothermic, the energy loss is expected to be significantly reduced by combining the reactions. Hydrogen yields are expected to be higher because the equilibrium may be shifted by the removal of the CO2 byproduct. We have therefore proposed a pre-combustion CO2 capture system using lithium silicate and steam reforming. Bench-scale experiments were performed to measure the methane conversion and CO2 removal efficiency in order to evaluate the feasibility of the pre-combustion CO2 capture system. At temperatures of less than 650oC, the methane conversion in the case of mixture of catalyst and absorbent was higher than that in the case of catalyst alone. In addition, the CO2 removal efficiency is almost 90%. These results appear to indicate that pre-combustion CO2 capture combined with steam reforming is feasible.

CO2 Capture for Power Plants: An Analysis of the Energetic Requirements by Chemical Absorption

2006 ◽  
Author(s):  
Ana R. Diaz
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Co2 Capture ◽  
Power Plants ◽  
Fossil Fuel ◽  
Plant Performance ◽  
Energy Requirements ◽  
Co2 Absorption ◽  
Chemical Absorption ◽  
Technical Effort

The tendency in the world energy demand seems clear: it can only grow. The energetic industry will satisfy this demand-despite all its dialectic about new technologies-at least medium term mostly with current fossil fuel technologies. In this picture from an engineer’s point of view, one of the primary criterions for mitigating the effects of increasing atmospheric concentration of CO2 is to restrict the CO2 fossil fuel emissions into the atmosphere. This paper is focused on the analysis of different CO2 capture technologies for power plants. Indeed, one of the most important goal to concentrate on is the CO2 capture energy requirements, as it dictates the net size of the power plant and, hence, the net cost of power generation with CO2 avoidance technologies. Here, the Author presents a critical review of different CO2 absorption capture technologies. These technologies have been widely analyzed in the literature under chemical and economic points of view, leaving their impact on the energy power plant performance in a second plan. Thus, the central question examined in this paper is the connection between abatement capability and its energetic requirements, which seriously decrease power generation efficiency. Evidencing that the CO2 capture needs additional technical effort and establishing that further developments in this area must be constrained by reducing its energy requirements. After a comprehensive literature revision, six different chemical absorption methods are analyzed based on a simplified energetic model, in order to account for its energetic costs. Furthermore, an application case study is provided where the different CO2 capture systems studied are coupled to a natural gas cogeneration power plant.

scholarly journals Optimization of the design, operating conditions, and coupling configuration of combined cycle power plants and CO2 capture processes by minimizing the mitigation cost

2018 ◽  
Vol 331 ◽  
pp. 870-894 ◽  
Author(s):  
Patricia L. Mores ◽  
Juan I. Manassaldi ◽  
Nicolás J. Scenna ◽  
José A. Caballero ◽  
Miguel C. Mussati ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Power Plants ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Mitigation Cost

scholarly journals Biocatalytic CO2 Absorption and Structural Studies of Carbonic Anhydrase under Industrially-Relevant Conditions

2020 ◽  
Vol 21 (8) ◽  
pp. 2918
Author(s):  
Aline M. de Castro ◽  
Elisabete Ferreira ◽  
Carla Portugal ◽  
Luisa A. Neves ◽  
João G. Crespo
Keyword(s):  
Carbonic Anhydrase ◽  
Co2 Capture ◽  
Large Scale ◽  
Rate Increase ◽  
Absorption Capacity ◽  
Co2 Absorption ◽  
Structural Studies ◽  
Kinetic Rate ◽  
Capture Process ◽  
Bovine Erythrocytes

The unprecedently high CO2 levels in the atmosphere evoke the urgent need for development of technologies for mitigation of its emissions. Among the alternatives, the biocatalytic route has been claimed as one of the most promising. In the present work, the carbonic anhydrase from bovine erythrocytes (BCA) was employed as a model enzyme for structural studies in an aqueous phase at alkaline pH, which is typical of large-scale absorption processes under operation. Circular dichroism (CD) analysis revealed a high enzymatic stability at pH 10 with a prominent decrease of the melting temperature above this value. The CO2 absorption capacity of the aqueous solutions were assessed by online monitoring of pressure decay in a stainless-steel cell, which indicated a better performance at pH 10 with a kinetic rate increase of up to 43%, as compared to non-biocatalytic conditions. Even low enzyme concentrations (0.2 mg g−1) proved to be sufficient to improve the overall CO2 capture process performance. The enzyme-enhanced approach of CO2 capture presents a high potential and should be further studied.

scholarly journals Metal oxide materials for high temperature CO2sorption studies

2014 ◽  
Vol 70 (a1) ◽  
pp. C69-C69
Author(s):  
Adriano Pavan ◽  
Peter Blanchard ◽  
Samuel Liu ◽  
Chris Ling
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Power Plants ◽  
Structural Evolution ◽  
Absorption Capacity ◽  
Co2 Absorption ◽  
Oxide Materials ◽  
Combustion Chambers ◽  
X Ray ◽  
Over Time

In recent years, a number of novel ceramic oxide materials have emerged that are capable of absorbing CO2 at high temperatures (>500C) while remaining stable over a large number of cycles and a wide range of temperatures [1]. The most promising are been considered for carbon capture applications – specifically, for use in combustion chambers and the smoke stacks of power plants where combustion gases which contain primarily a mixture of CO2 and N2 at high temperature. Compared to other CO2 sequestration technologies, these ceramics have some advantages (eg. chemisorption at high temperatures) and disadvantages (eg. limited kinetics over time) [3]. Examples of oxides already known to show significant CO2 absorption include Li5AlO4, Li6Zr2O7, Na2ZrO3 and Ba4Sb2O9. The phase formations and structural evolution of these metal oxides have been studied under environmental conditions mimicing those found in combustion chambers and power plants, over the temperature range 873–1173 K. CO2 absorption by these materials is believed to proceed through a layering effect of the sorbent material, explained through a core-shell model (see figure). Each phase is represented as a layer covering a particle, with the outermost layer exposed and allowed to react with the environment. Detailed studies into the mechanism of CO2 absorption and the material layers will shed more information that can be used to fine tune the materials to increase their CO2 absorption capacity. Previous work has focused on the identification of phases ex situ and studies of their practical absorption capacity and kinetics. The new work we will present here uses a combination of a x-ray spectroscopy, x-ray and neutron diffraction, to understand both how the sorption process works and how the structural evolution of the phases affects the CO2 sorption of the materials over time in-situ.

Analysis of CO2 Capture From Power-Plant Flue Gas Using the Membrane Gas Absorption (MGA) Method

2015 ◽  
Author(s):  
Zhien Zhang ◽  
Yunfei Yan ◽  
Junlei Wang ◽  
Li Zhang ◽  
Yanrong Chen ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Operating Conditions ◽  
Gas Absorption ◽  
Optimum Operating ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Capture Process ◽  
Gas Concentration ◽  
Liquid Concentration

Currently membrane gas absorption (MGA) is a novel approach for gas separation. In the present work, a wide-ranging 2D mathematical model for CO2 absorption from the N2/CO2 mixture is proposed. Single solvents [H2O, ethylenediamine (EDA), diethanolamine (DEA), monoethanolamine (MEA), piperazine (PZ)] and blended solvents [DEA/PZ] were used as the absorbents. The non-wetting mode for the membrane contactor was considered in the calculations. The effects of gas concentration and velocity, and liquid concentration and velocity on CO2 removal were observed. The simulation results were verified with the experimental data showing a good agreement. The modeling results indicate that gas concentration and velocity have a negative effect on the capture process, while liquid concentration and velocity enhance CO2 capture. Also, it is noted that PZ has the best absorption performance than other single absorbents. The chemical solvents are much better than the physical solvent for the absorption of CO2. For mixed absorbents based on amine solutions, the CO2 removal efficiency could be about 20% higher than that of the single solutions. Thus, this model could provide the optimum operating conditions for acid gas absorption in the hollow fiber membrane module. It is also proved that the MGA approach exhibits a good potential in power-plant waste gas purification.

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