A Study Numerical Simulation of Post Combustion CO2 Capture Process

2009 ◽  
Author(s):  
Rosa-Hilda Chavez ◽  
Javier de J. Guadarrama ◽  
Abel Hernandez-Guerrero
Keyword(s):  
Co2 Capture ◽  
Flue Gas ◽  
Reaction Rate ◽  
Operating Cost ◽  
Chemical Processes ◽  
Operating Conditions ◽  
Fast Reaction ◽  
Capture Process ◽  
Amine Absorption ◽  
Fast Reaction Rate

Amine absorption technology, in particular that based on the Monoethanolamine (MEA) process, is considered to be viable for low pressure flue gas CO2 capture because of the MEA-CO2 fast reaction rate. MEA absorption processes are associated with high capital and operating cost because a significant amount of energy is required for solvent regeneration and severe operating problems are present such as corrosion and solvent loss and degradation. The overall objective of this study is to evaluate the feasibility of obtaining the heat required for amine absorption for a particular recovery of carbon dioxide. Comparisons among cases were performed to determine the best operating conditions for CO2 capture. An analysis of the lean loading and recovery percent were carried out as well as the different absorber and stripper combinations by using the chemical processes simulator.

Exergy Analysis of the Sequestration of CO2 Emissions

2008 ◽  
Author(s):  
Rosa-Hilda Chavez ◽  
Javier de J. Guadarrama ◽  
Abel Hernandez-Guerrero
Keyword(s):  
Carbon Dioxide ◽  
Co2 Capture ◽  
Flue Gas ◽  
Exergy Analysis ◽  
Carbon Dioxide Capture ◽  
Second Law Of Thermodynamics ◽  
Chemical Processes ◽  
Operating Conditions ◽  
Second Law ◽  
Amine Absorption

Carbon dioxide capture from flue gas using amine-based CO2 capture technology requires huge amounts of energy mostly in the form of heat. The overall objective of this study is to evaluate the feasibility of obtaining the heat required for amine absorption for a particular recovery of carbon dioxide for a given a set of equipment specifications and operating conditions from the process and to develop a model that simulates the removal of CO2 using Monoethanolamine (MEA) absorption from flue gas and design a process that will minimize the energy of CO2 capture with Aspen Plus™ will be used. A very useful procedure for analyzing a process is by means of the Second Law of Thermodynamics. Thermodynamic analyses based on the concepts of irreversible entropy increase have frequently been suggested as pointers to sources of inefficiency in chemical processes.

scholarly journals Operation of a Pilot-Scale CO2 Capture Process with a New Energy-Efficient Polyamine Solvent

2020 ◽  
Vol 10 (21) ◽  
pp. 7669
Author(s):  
Yunje Lee ◽  
Junghwan Kim ◽  
Huiyong Kim ◽  
Taesung Park ◽  
Hailian Jin ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Flue Gas ◽  
Energy Efficient ◽  
Carbon Capture ◽  
Reaction Rate ◽  
Pilot Scale ◽  
Capture Process ◽  
New Energy

A new blending recipe of a polyamine-based solvent for capturing post-combustion CO2 was proposed, and its performance and characteristics were investigated using a pilot-scale carbon capture process (PCCP). The proposed solvent is a blend of three types of amines and was designed to separate the solvent roles into those of a main amine, auxiliary amine, and reaction-rate-enhancing amine. Polyamine 3,3′-iminobis (N, N-dimethylpropylamine) was selected as the main amine given its ability to capture large amounts of CO2. 2-Amino-2-methyl-1-propanol was used as the auxiliary amine, with piperazine added as the reaction-rate-enhancing amine. This solvent was tested in a PCCP that can handle 150 Nm3/h of flue gas. The proposed solvent was found to operate stably while consuming substantially lower reboiler duty than the monoethanolamine (MEA) 30 mass% solvent.

Performance Prediction of High-Temperature CO2 Capture System Utilizing Lithium Silicate for Pulverized Coal-Fired Power Plant

2005 ◽  
Author(s):  
Takao Nakgaki ◽  
Katsuya Yamashita ◽  
Masahiro Kato ◽  
Kenji Essaki ◽  
Takayuki Iwahashi ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Flue Gas ◽  
Reaction Rate ◽  
Exothermic Reaction ◽  
Significant Loss ◽  
Pulverized Coal ◽  
Lithium Silicate ◽  
Reactor Performance ◽  
Co2 Sorbent

Lithium silicate is a solid CO2-sorbent that can be used repeatedly, and uniquely features absorption of CO2 at temperatures between 500°C and 600°C with an exothermic reaction and regeneration at temperatures above 700°C with an endothermic reaction. This paper introduces the conceptual model and feasibility study of the CO2 capture system utilizing the lithium silicate applicable to a pulverized coal-fired power plant. In this system, assuming a moving bed, the sorbent reactor is installed in a 500MW boiler and absorbs CO2 in the flue gas, and after the absorption process, recirculation of CO2 transports the heat for regeneration. To design the system, unsteady state numerical analysis was used to predict the reactor performance in a 60-minute cycle for absorption and regeneration, which includes the reaction rate based on experimental data. The analysis result indicates that about 20% of CO2 can be captured from flue gas without significant loss in the power generation efficiency.

Non-classical hydrogen bond triggered strand displacement for analytical applications and DNA nanostructure assembly

2018 ◽  
Vol 42 (9) ◽  
pp. 6636-6639 ◽  
Author(s):  
Manli Han ◽  
Qingsheng Fan ◽  
Yi Zhang ◽  
Lida Xu ◽  
Changyuan Yu ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Reaction Rate ◽  
Cyanuric Acid ◽  
Strand Displacement ◽  
Fast Reaction ◽  
Dna Nanostructure ◽  
Analytical Applications ◽  
Classical Hydrogen Bond ◽  
Fast Reaction Rate

A novel strand displacement triggered by the non-classical hydrogen bond between cyanuric acid and adenine exhibits a fast reaction rate.

scholarly journals Heat Stable Salt Accumulation and Solvent Degradation in a Pilot-Scale CO2 Capture Process Using Coal Combustion Flue Gas

2014 ◽  
Vol 14 (2) ◽  
pp. 550-558 ◽  
Author(s):  
Jesse G. Thompson ◽  
Reynolds Frimpong ◽  
Joseph E. Remias ◽  
Jim K. Neathery ◽  
Kunlei Liu
Keyword(s):  
Co2 Capture ◽  
Flue Gas ◽  
Coal Combustion ◽  
Pilot Scale ◽  
Salt Accumulation ◽  
Capture Process ◽  
Heat Stable

Solvent Degradation in CO2 Capture Process from Power Plant Flue Gas

2014 ◽  
Vol 49 (6) ◽  
pp. 371-375
Author(s):  
Haroon Ur Rashid ◽  
Khalid Khan ◽  
Muhammad Yaseen ◽  
Muhammad Naveed Umar
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Flue Gas ◽  
Capture Process

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 Evaluation of Emissions of 2-Amino-2-Methyl-1-Propanol Degradation Products by adding Degradation Reactions to the Carbon Dioxide Capture Unit

2021 ◽  
Vol 24 (11) ◽  
pp. 1993-1998
Author(s):  
EI Osagie
Keyword(s):  
Carbon Dioxide ◽  
Flue Gas ◽  
Degradation Products ◽  
Operating Cost ◽  
Aspen Plus ◽  
Side Reactions ◽  
Process Variables ◽  
Capture Process ◽  
Plant Model ◽  
Degradation Reactions

Degradation is a major problem which poses lots of emission risk during chemical absorption process with amine solvents. Degradation occurs through irreversible side reactions with CO2 and other flue gas components, forming into products that cannot easily regenerate. The degradation products then react with amines to form thermally stable salts, which accumulate in the system over time. The problems associated with degradation include decreased plant equipment life, foaming, corrosion, high solution viscosity, and increased operating cost. Amines capture about 70 90% CO2 from commercial power stations. These high removal rates have many environmental impacts due to their degradation products. Researchers have therefore shown interest in characterising and quantifying atmospheric emissions of amines and their degradation products. In this study, 2-Amino-2-Methyl-1-Propanol (AMP) degradation reactions were included into a largescale capture plant model to evaluate the influence of process variables, the emissions of AMP and its degradation products. Steadystate simulations were performed using Aspen Plus® V8.4 software to provide a full assessment of the degradation products and their impact on the capture process. This assessment is important because it identifies and quantifies all pollutants emitted from the process plant. The results of the simulation indicate that AMP emissions are 3.04E+03mg/Nm3 of CO2 lean flue gas, while the quantity of AMP lost due to degradation was 37.88kg/s for the largescale capture plant. The results further showed that among the gases emitted, ammonia was highest, while acetone was the highest gas formed. In this study, 2-amino-2-methyl-1-propanol (AMP) degradation reactions were included into a largescale carbon dioxide (CO2) capture plant model to evaluate the influence of process variables, AMP emissions and its degradation products. Steadystate simulations were performed using Aspen Plus® V8.4 software to provide a full assessment of the degradation products and their impact on the largescale AMP capture process. The results of the equilibrium model developed in this study revealed that AMP emissions are 3.04E+03mg/Nm3 of CO2 lean flue gas, while the quantity of AMP lost due to degradation was 37.88kg/s for the largescale capture plant. More importantly, the emissions obtained from the PWOD and PWD are 7.80E+03 mg/Nm3 and 9.82E+03 mg/Nm3 of CO2 respectively. Keywords: oxidative degradation, 2amino2methyl1 propanol, emissions, modelling

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