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.

scholarly journals Optimized Simulation of CO2 Removal Process from Coal Fired Power Plants with MEA by Sensitivity Analysis in Aspen plus

2017 ◽  
Vol 11 (2) ◽  
pp. 191 ◽  
Author(s):  
Ruth Nataly Echevarria Huamán
Keyword(s):  
Energy Consumption ◽  
Process Model ◽  
Aspen Plus ◽  
Optimum Operating ◽  
Design Parameters ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Capture Process ◽  
Desorption Process ◽  
Optimum Operating Condition

The World Energy consumption has been increasing steadily since industrialization, this recent increase is also the major cause for the raise of CO2 concentration in the atmosphere. Fossil fuels play a central role in our energy consumption; actually the CCS technology and their operations in power systems must get a prominent role in reducing total CO2 emissions. An attempt to tackle the problem of solvent based Post Combustion Carbon Capture process optimization requires the availability of a rigorous process model along with a design methodology. During the modeling, much physical and chemical process should be considered in order to get more realistic results, this complexity process addressed as Reactive Separation. This report presents detailed descriptions of the process sections as well as technical documentation for the ASPEN Plus simulations including the design basis, models employed, key assumptions, design parameters, convergence algorithms, concentration and temperature profiles and calculated outputs. The main purpose is to minimize the amount of energy required in the desorption process through the optimum operating condition to the actual CO2 absorption experimental setup. The case of study is on MEA 30wt% in a coal Hired power plant. Electrolytic method is considered; the sensitive analysis was used for the Optimization.

Shand Coal Fired Power Plant Integrating a Post Combustion CO2 Capture Process

2019 ◽  
Author(s):  
Wayuta Srisang ◽  
Teerawat Sanpasertparnich ◽  
Brent Jacobs ◽  
Stavroula Giannaris ◽  
Corwyn Bruce ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Capture Process

scholarly journals CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 496
Author(s):  
Sayali Ramdas Chavan ◽  
Patrick Perré ◽  
Victor Pozzobon ◽  
Julien Lemaire
Keyword(s):  
Hollow Fiber ◽  
Recovery Rate ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Fiber Membrane ◽  
Residual Content ◽  
Membrane Contactors ◽  
Ph Swing

Recently, membrane contactors have gained more popularity in the field of CO2 removal; however, achieving high purity and competitive recovery for poor soluble gas (H2, N2, or CH4) remains elusive. Hence, a novel process for CO2 removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO2 hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO2 in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO2 residual content in the regenerated absorbent, by converting CO2 into its ionic counterparts (HCO3− or CO32−) before absorption and improving CO2 degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO2 residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N2/CO2 mixture, this process achieved a nitrogen purity of 99.97% with a N2 recovery rate of 94.13%. Similarly, for H2/CO2 mixture, a maximum H2 purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.

Integration of a Coal-Fired Power Plant with an Ammonia-Based CO2 Capture Process in Three Operation Modes

2018 ◽  
Vol 32 (10) ◽  
pp. 10760-10772 ◽  
Author(s):  
Rongrong Zhai ◽  
Hai Yu ◽  
Lingjie Feng ◽  
Ying Chen ◽  
Kangkang Li ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Capture Process ◽  
Operation Modes

Pilot plant results for advanced CO2 capture process using amine scrubbing at the Jaworzno II Power Plant in Poland

Fuel ◽  
2015 ◽  
Vol 151 ◽  
pp. 50-56 ◽  
Author(s):  
Marcin Stec ◽  
Adam Tatarczuk ◽  
Lucyna Więcław-Solny ◽  
Aleksander Krótki ◽  
Marek Ściążko ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Pilot Plant ◽  
Capture Process

Analysis of Gas-Steam Combined Cycles With Natural Gas Reforming and CO2 Capture

2005 ◽  
Vol 127 (3) ◽  
pp. 545-552 ◽  
Author(s):  
Alessandro Corradetti ◽  
Umberto Desideri
Keyword(s):  
Power Plant ◽  
Natural Gas ◽  
Co2 Emissions ◽  
Co2 Capture ◽  
Carbon Dioxide Emissions ◽  
Research Work ◽  
Combined Cycle ◽  
Co2 Absorption ◽  
Syngas Production ◽  
Natural Gas Reforming

In the last several years greenhouse gas emissions, and, in particular, carbon dioxide emissions, have become a major concern in the power generation industry and a large amount of research work has been dedicated to this subject. Among the possible technologies to reduce CO2 emissions from power plants, the pretreatment of fossil fuels to separate carbon from hydrogen before the combustion process is one of the least energy-consuming ways to facilitate CO2 capture and removal from the power plant. In this paper several power plant schemes with reduced CO2 emissions were simulated. All the configurations were based on the following characteristics: (i) syngas production via natural gas reforming; (ii) two reactors for CO-shift; (iii) “precombustion” decarbonization of the fuel by CO2 absorption with amine solutions; (iv) combustion of hydrogen-rich fuel in a commercially available gas turbine; and (v) combined cycle with three pressure levels, to achieve a net power output in the range of 400 MW. The base reactor employed for syngas generation is the ATR (auto thermal reformer). The attention was focused on the optimization of the main parameters of this reactor and its interaction with the power section. In particular the simulation evaluated the benefits deriving from the postcombustion of exhaust gas and from the introduction of a gas-gas heat exchanger. All the components of the plants were simulated using ASPEN PLUS software, and fixing a reduction of CO2 emissions of at least 90%. The best configuration showed a thermal efficiency of approximately 48% and CO2 specific emissions of 0.04 kg/kWh.

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.

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