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Author: Yuying Wu (Ph. D.) Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Piperazine is a promising second-generation solvent for amine scrubbing in post-combustion CO2 capture. However, the oxidative degradation of PZ can cause environmental problems and economic loss. This work presents the effects of two mitigation methods: carbon treating and N2 sparging, on the PZ oxidation in long-term operations. The species and their respective quantities adsorbed by the activated carbon were tested in a bench-scale device. The carbon was then tested in the High Temperature Oxidation Reactor (HTOR), where the solvent oxidizes at a reasonably fast rate. Pilot plant campaigns were also performed at the UT Austin SRP and the National Carbon Capture Center (NCCC) and the effects were verified. When dissolved Fe is removed by carbon treating or other methods, available soluble Fe in the system dissolves and replaces the dissolved Fe. Therefore, all available Fe and ligands need to be removed for the mitigation to be effective. The sources of soluble Fe include fly ash and the corrosion of stainless steel, and the ligands are degradation products. All PZ degraded solvents have two absorbance peaks at 320 nm and 538 nm. The 320 nm peak is caused by dissolved metals, especially Fe, complexed by degradation products. The 320 nm peak is related to the amine degradation level and can be used as a simple and efficient method to estimate the amine degradation rate. The pilot plant data suggest that NO2 can oxidize PZ significantly, possibly through radical reactions. 0.01 mmol/kg-hr absorption of NO2 increased the PZ oxidation rate from 1.2 mmol/kg-hr to 2.5 mmol/kg-hr
Author: Yuying Wu (Ph. D.) Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Piperazine is a promising second-generation solvent for amine scrubbing in post-combustion CO2 capture. However, the oxidative degradation of PZ can cause environmental problems and economic loss. This work presents the effects of two mitigation methods: carbon treating and N2 sparging, on the PZ oxidation in long-term operations. The species and their respective quantities adsorbed by the activated carbon were tested in a bench-scale device. The carbon was then tested in the High Temperature Oxidation Reactor (HTOR), where the solvent oxidizes at a reasonably fast rate. Pilot plant campaigns were also performed at the UT Austin SRP and the National Carbon Capture Center (NCCC) and the effects were verified. When dissolved Fe is removed by carbon treating or other methods, available soluble Fe in the system dissolves and replaces the dissolved Fe. Therefore, all available Fe and ligands need to be removed for the mitigation to be effective. The sources of soluble Fe include fly ash and the corrosion of stainless steel, and the ligands are degradation products. All PZ degraded solvents have two absorbance peaks at 320 nm and 538 nm. The 320 nm peak is caused by dissolved metals, especially Fe, complexed by degradation products. The 320 nm peak is related to the amine degradation level and can be used as a simple and efficient method to estimate the amine degradation rate. The pilot plant data suggest that NO2 can oxidize PZ significantly, possibly through radical reactions. 0.01 mmol/kg-hr absorption of NO2 increased the PZ oxidation rate from 1.2 mmol/kg-hr to 2.5 mmol/kg-hr
Author: Paul Thomas Nielsen (III) Publisher: ISBN: Category : Languages : en Pages : 580
Book Description
Solvent oxidation in amine scrubbing systems for post-combustion CO2 capture is a significant issue. Piperazine (PZ) is a promising solvent due to its relative stability and performance. PZ oxidation rates and products were thoroughly characterized in the High Temperature Oxidation Reactor (HTOR) bench-scale cyclic degradation apparatus and compared to observed PZ oxidation from campaigns at the UT Austin SRP, CSIRO Tarong, and “Pilot Plant 2” (PP2) pilot-scale facilities. The HTOR simulated solvent conditions cycling between a 40-55 °C absorber and a 120-150 °C stripper. In both the bench and pilot-scale the intermediary degradation products piperazinol, piperazinone, and ethylenediamine were initially the most significant degradation products before reaching steady-state concentrations, with ammonia and formate the most significant final products produced from the decomposition of the intermediates. PZ oxidation increased as the solvent degraded due to the cycling of dissolved iron, aldehydes, and hydroperoxide contaminants, which could be oxidized in the absorber and subsequently oxidize PZ at high temperature. An N2 sparger was used to selectively remove dissolved oxygen (DO) in the HTOR before heating while still allowing for oxidation due to contaminant cycling. Ammonia was correlated to dissolved iron at 0.72 mmol NH3/kg PZ/hr/(mmol/kg Fe) [superscript 0.5]. An additional 0.4 mmol NH3/kg/hr was produced due to direct reaction of PZ with DO regardless of the level of contamination. Dissolved iron was solubility-limited in both the HTOR and pilot plants, but increased as the solvent degraded, resulting in the autocatalytic effect of PZ oxidation. HTOR data was used to model oxidation and solvent management costs for a full-scale amine scrubber. The model matched observed oxidation at SRP and Tarong. Maintaining 0.1 to 0.5 wt % contaminant accumulation optimized amine make-up, solvent reclaiming, and increased energy costs due to changes in solvent viscosity, at a minimum of $2.6/MT CO2 for PZ treating coal flue gas with a thermal reclaimer to remove contaminants. Feed rate and amine recovery in the reclaimer were the most impactful design variables, followed by operating temperature and hold-up in the stripper, prescrubbing of flue gas contaminants SO2 and NO2, and least significantly N2 sparging to remove DO.
Author: Paul Feron Publisher: Woodhead Publishing ISBN: 0081005156 Category : Technology & Engineering Languages : en Pages : 816
Book Description
Absorption-Based Post-Combustion Capture of Carbon Dioxide provides a comprehensive and authoritative review of the use of absorbents for post-combustion capture of carbon dioxide. As fossil fuel-based power generation technologies are likely to remain key in the future, at least in the short- and medium-term, carbon capture and storage will be a critical greenhouse gas reduction technique. Post-combustion capture involves the removal of carbon dioxide from flue gases after fuel combustion, meaning that carbon dioxide can then be compressed and cooled to form a safely transportable liquid that can be stored underground. - Provides researchers in academia and industry with an authoritative overview of the amine-based methods for carbon dioxide capture from flue gases and related processes - Editors and contributors are well known experts in the field - Presents the first book on this specific topic
Author: Stephanie Anne Freeman Publisher: ISBN: Category : Languages : en Pages : 1468
Book Description
Absorption-stripping with aqueous, concentrated piperazine (PZ) is a viable retrofit technology for post-combustion CO2 capture from coal-fired power plants. The rate of thermal degradation and oxidation of PZ was investigated over a range of temperature, CO2 loading, and PZ concentration. At 135 to 175 °C, degradation is first order in PZ with an activation energy of 183.5 kJ/mole. At 150 °C, the first order rate constant, k1, for thermal degradation of 8 m PZ with 0.3 mol CO2/mol alkalinity is 6.12 x 10−9 s−1. After 20 weeks of degradation at 165 °C, 74% and 63%, respectively, of the nitrogen and carbon lost in the form of PZ and CO2 was recovered in quantifiable degradation products. N-formylpiperazine, ammonium, and N-(2-aminoethyl) piperazine account for 57% and 45% of nitrogen and carbon lost, respectively. Thermal degradation of PZ likely proceeds through SN2 substitution reactions. In the suspected first step of the mechanism, 1-[2-[(2-aminoethyl) amino]ethyl] PZ is formed from a ring opening SN2 reaction of PZ with HPZ. Formate was found to be generated during thermal degradation from CO2 or CO2-containing molecules. An analysis of k1 values was applied to a variety of amines screened for thermal stability in order to predict a maximum recommended stripper temperature. Morpholine, piperidine, PZ, and PZ derivatives were found to be the most stable with an allowable stripper temperature above 160 °C. Long-chain alkyl amines or alkanolamines such as N-(2-hydroxyethyl)ethylenediamine and diethanolamine were found to be the most unstable with an allowable stripper temperature below 120 °C. Iron (Fe2) and stainless steel metals (Fe2+, Ni2+, and Cr3+) were found to be only weak catalysts for oxidation of PZ, while oxidation was rapidly catalyzed by copper (Cu2+). In a system with Fe2+ or SSM, 5 kPa O2 in the inlet flue gas, a 55 °C absorber, and one-third residence time with O2, the maximum loss rate of PZ is expected to 0.23 mol PZ/kg solvent in one year of operation. Under the same conditions but with Cu2+ present, the loss rate of PZ is predicted to be 1.23 mole PZ/kg solvent in one year of operation. Inhibitor A was found to be effective at decreasing PZ loss catalyzed by Cu2+. Ethylenediamine, carboxylate ions, and amides were the only identified oxidation products. Total organic carbon analysis and overall mass balances indicate a large concentration of unidentified oxidation products.
Author: Helei Liu Publisher: Springer ISBN: 303000922X Category : Technology & Engineering Languages : en Pages : 55
Book Description
This book presents a comprehensive review of the latest information on all aspects of the post-combustion carbon capture process. It provides designers and operators of amine solvent-based CO2 capture plants with an in-depth understanding of the most up-to-date fundamental chemistry and physics of the CO2 absorption technologies using amine-based reactive solvents. Topics covered include the physical properties, chemical analysis, reaction kinetics, CO2 solubility, and innovative configurations of absorption and stripping columns as well as information on technology applications. This book also examines the post-build operational issues of corrosion prevention and control, solvent management, solvent stability, solvent recycling and reclaiming, intelligent monitoring and plant control including process automation. In addition, the authors discuss the recent insights into the theoretical basis of plant operation in terms of thermodynamics, transport phenomena, chemical reaction kinetics/engineering, interfacial phenomena, and materials. The insights provided help engineers, scientists, and decision makers working in academia, industry and government gain a better understanding of post-combustion carbon capture technologies.
Author: Wojciech M. Budzianowski Publisher: Springer ISBN: 3319472623 Category : Technology & Engineering Languages : en Pages : 282
Book Description
This book reviews and characterises promising single-compound solvents, solvent blends and advanced solvent systems suitable for CO2 capture applications using gas-liquid absorption. Focusing on energy efficient solvents with minimal adverse environmental impact, the contributions included analyse the major technological advantages, as well as research and development challenges of promising solvents and solvent systems in various sustainable CO2 capture applications. It provides a valuable source of information for undergraduate and postgraduate students, as well as for chemical engineers and energy specialists.
Author: David Reay Publisher: Butterworth-Heinemann ISBN: 0080983057 Category : Technology & Engineering Languages : en Pages : 624
Book Description
Process Intensification: Engineering for Efficiency, Sustainability and Flexibility is the first book to provide a practical working guide to understanding process intensification (PI) and developing successful PI solutions and applications in chemical process, civil, environmental, energy, pharmaceutical, biological, and biochemical systems. Process intensification is a chemical and process design approach that leads to substantially smaller, cleaner, safer, and more energy efficient process technology. It improves process flexibility, product quality, speed to market and inherent safety, with a reduced environmental footprint. This book represents a valuable resource for engineers working with leading-edge process technologies, and those involved research and development of chemical, process, environmental, pharmaceutical, and bioscience systems. - No other reference covers both the technology and application of PI, addressing fundamentals, industry applications, and including a development and implementation guide - Covers hot and high growth topics, including emission prevention, sustainable design, and pinch analysis - World-class authors: Colin Ramshaw pioneered PI at ICI and is widely credited as the father of the technology
Author: Mohammad Reza Rahimpour Publisher: Woodhead Publishing ISBN: 0128227583 Category : Science Languages : en Pages : 574
Book Description
Advances in Carbon Capture reviews major implementations of CO2 capture, including absorption, adsorption, permeation and biological techniques. For each approach, key benefits and drawbacks of separation methods and technologies, perspectives on CO2 reuse and conversion, and pathways for future CO2 capture research are explored in depth. The work presents a comprehensive comparison of capture technologies. In addition, the alternatives for CO2 separation from various feeds are investigated based on process economics, flexibility, industrial aspects, purification level and environmental viewpoints. - Explores key CO2 separation and compare technologies in terms of provable advantages and limitations - Analyzes all critical CO2 capture methods in tandem with related technologies - Introduces a panorama of various applications of CO2 capture
Author: Mai Bui Publisher: Royal Society of Chemistry ISBN: 1788011457 Category : Political Science Languages : en Pages : 596
Book Description
This book will provide the latest global perspective on the role and value of carbon capture and storage (CCS) in delivering temperature targets and reducing the impact of global warming. As well as providing a comprehensive, up-to-date overview of the major sources of carbon dioxide emission and negative emissions technologies, the book also discusses technical, economic and political issues associated with CCS along with strategies to enable commercialisation.
Author: Prof. Lars O. Nord Publisher: John Wiley & Sons ISBN: 3527347534 Category : Technology & Engineering Languages : en Pages : 344
Book Description
Provides an engaging and clearly structured source of information on the capture and storage of CO2 Designed to bridge the gap between the many disciplines involved in carbon dioxide emission management, this book provides a comprehensive yet easy-to-understand introduction to the subject of CO2 capture. Fit for graduate students, practicing process engineers, and others interested in the subject, it offers a clear understanding and overview of thermal power plants in particular and of carbon dioxide capture and storage (CCS) in general. Carbon Dioxide Emission Management in Power Generation starts with a discussion of the greenhouse effect, climate change, and CO2 emissions as the rationale for the concept of CCS. It then looks at the long-term storage of CO2. A chapter covering different fossil fuels, their usage, and properties comes next, followed by sections on: CO2 generation, usage and properties; power plant technologies; theory of gas separation; power plant efficiency calculations; and classification of CO2 capture methods. Other chapters examine: CO2 capture by gas absorption and other gas separation methods; removing carbon from the fuel; pre- and post-combustion CO2 capture in power cycles; and oxy-combustion CO2 capture in power cycles. -Discusses both CO2 capture technologies as well as power generation technologies -Bridges the gap between many different disciplines?from scientists, geologists and engineers, to economists -One of the few books that covers all the different sciences involved in the capture and storage of CO2 -Introduces the topic and provides useful information to the academic as well as professional reader Carbon Dioxide Emission Management in Power Generation is an excellent book for students who are interested in CO2 capture and storage, as well as for chemists in industry, environmental chemists, chemical engineers, geochemists, and geologists.
Author: Yuying Wu (Ph. D.)
Author: Yuying Wu (Ph. D.)
Author: Paul Thomas Nielsen (III)
Author: Paul Feron
Author: Stephanie Anne Freeman
Author: Helei Liu
Author: Wojciech M. Budzianowski
Author: David Reay
Author: Mohammad Reza Rahimpour
Author: Mai Bui
Author: Prof. Lars O. Nord