Oxy-fuel Combustion Research Articles

Study on intrinsic reaction kinetics of coal char oxy-fuel combustion based on general surface activation function model

Study on intrinsic reaction kinetics of coal char oxy-fuel combustion based on general surface activation function model

Development of carbon capture and storage technologies in natural gas facilities for clean energy production

Carbon capture and storage (CCS) technologies represent a critical strategic intervention in addressing global climate change challenges while maintaining energy security in natural gas infrastructure. This comprehensive review explores the multifaceted landscape of CCS technologies, examining technological innovations, economic frameworks, and environmental implications for clean energy production. By synthesizing current research and emerging approaches, the study provides a holistic assessment of CCS potential in mitigating carbon emissions from natural gas facilities. The review critically analyzes existing capture technologies, including post-combustion, pre-combustion, and oxy-fuel combustion methods, highlighting recent advances in material sciences and technological innovations. Economic considerations are examined through the lens of investment strategies, policy frameworks, and long-term viability. Environmental performance evaluation encompasses comprehensive emissions assessment, geological storage risks, and broader ecosystem implications. Key findings underscore the complexity of CCS implementation, revealing both significant challenges and promising opportunities for transforming natural gas infrastructure. The study emphasizes the need for interdisciplinary approaches, robust policy support, and continued technological innovation to realize the full potential of carbon capture technologies in achieving sustainable energy transitions.

Minimizing Carbon Capture Costs in Power Plants: A Novel Dimensional Analysis Framework for Techno‐Economic Evaluation of Oxyfuel Combustion, Pre‐combustion, and Post‐combustion Capture Systems

ABSTRACTThe imperative to mitigate anthropogenic CO2 emissions from power generation plants, which account for approximately 40% of global emissions, necessitates developing and deploying carbon capture, utilization, and storage (CCUS) technologies. This study undertakes a comprehensive techno‐economic evaluation of three primary CO2 capture technologies—pre‐combustion, post‐combustion, and oxy‐fuel combustion—integrated with natural gas power plants. Utilizing Aspen HYSYS design simulation and economic assessments, the technical and economic viability of each technology were investigated, considering key metrics such as levelized cost of energy (LCOE), carbon emission intensity (CEI), cost of carbon avoidance (COA), investment costs, production costs, net present value, and rate of return. A multi‐criteria evaluation framework incorporating dimensional analysis was employed to compare the technologies, and the results revealed post‐combustion capture as the most viable option with a cost factor (CF) value of 0.85, striking an optimal balance between efficiency, costs, and environmental impact. With minimized TIC and TPC, well below the conventional processes, this study produced a unique framework for reducing costs in CCS technology deployment. Conversely, oxy‐fuel combustion has huge drawbacks regarding low profitability as it was found to have the highest total investment cost (TIC) of $8,258,483.99 and annual production cost (APC) of $9,234,870. In contrast, a higher CEI of 0.05 tCO2/MWh and COA of $150.33/tCO2 make pre‐combustion less environmentally friendly than the three technologies. The findings of this study provide critical insights to inform decision‐making in CCUS development, supporting a low‐carbon energy transition. Future research directions should focus on evaluating feasible configurations and optimizing post‐combustion capture technology for commercial‐scale deployment.

Mechanism of HCN formation from NO reduction by biomass-char in CO2/H2O atmosphere for oxy-fuel combustion – A combined experimental and DFT study

Mechanism of HCN formation from NO reduction by biomass-char in CO2/H2O atmosphere for oxy-fuel combustion – A combined experimental and DFT study

The effect of additives on particulate matter and gaseous emissions from combustion and oxy-fuel combustion of a biofuel blend composed of poultry manure and pine wood chips.

In this study, the effect of additives on particulate matter (PM) and flue gas emissions during the co-combustion of poultry waste and pine woodchips in air and oxy-fuel combustion conditions was examined. The appropriate additive for the fuel mixture to reduce PM emissions has been selected by a fast screening method based on thermogravimetric analysis (TGA) in oxygen environment. Among the additives CaHPO4, MgCO3, MnCO3, MgPO4, kaolin, CaO, and Zn, the most suitable ones were determined as Zn and MgCO3. The thermal degradation performance of biofuels containing 2 wt% additives was examined by TGA method under pyrolysis, combustion, and oxy-fuel combustion conditions. Ashes obtained from the additivated biofuel mixture were examined by XRF, XRD, and SEM-EDS analyses, and the effect of additives on the ash structure was investigated. Flue gas emissions of co-firing biofuel were analyzed by TGA-FTIR. It has been observed that the highest emission is CO2, and the oxy-fuel combustion process and addivation have shown reducing effect on CO2 emissions. Under oxy-fuel combustion conditions, higher CO and lower NOx, SO2, and HCl emissions occurred at a lower rate compared to the air environment, and additives also showed a reducing effect. The composition and crystal structure of Zn-additivated biofuel ash support its reducing effect in PM emissions. It was concluded that Zn is a more suitable additive in terms of PM and flue gas emissions than MgCO3.

Comprehensive technical evaluation and optimization of a carbon-neutral biomass-based power system integrating supercritical CO2 combustion and CO2 liquefaction with hydrogen production

Abstract The increasing reliance on fossil fuels poses critical challenges for energy systems. A novel power generation system integrating electricity/hydrogen production, oxy-fuel combustion, and CO2 liquefaction is evaluated through technical analysis and multi-objective optimization. Further, biomass-derived syngas powers the system, while a solid oxide electrolyzer (SOE) converts surplus energy into hydrogen, enhancing flexibility and efficiency. CO2 liquefaction reduces the levelized cost of electricity, contributing to economic feasibility. In addition, the system achieves optimized results with a cost of $0.37/kWh and $4.9 million in cash flow, demonstrating its potential as an efficient, sustainable energy solution with a 5.4% reduction in power.

Updated Weighted-Sum-of-Gray-Gases Model Parameters for a Wide Range of Water and Carbon Dioxide Concentrations and Temperatures up to 5000 K.

The weighted-sum-of-gray-gases model (WSGGM) is a commonly used radiative properties model for combustion engineering applications. This work presents updated WSGGM parameters from our previously published WSGGM to cover a temperature range up to 5000 K for pure H2O and CO2 species as well as mixtures of the two. The gases are considered ideal at all temperatures and new conditions are covered in comparison to existing WSGGM parameters; examples of engineering applications are hydrogen combustion, oxygen-enriched, and oxy-fuel combustion as well as thermal and hybrid plasma systems applying either H2O- or CO2-based plasma conditions. Thus, the parameters are considered relevant in high-temperature processes where gas dissociation effects are unknown. The updated sets of WSGGM parameters are compared to existing WSGGMs by predicting the total emissivity for different gaseous domains; the computational accuracy is assessed using the statistical narrow band model (SNBM) as a reference. Additional comparisons applying the WSGGMs for predicting the radiative source term under nonisothermal and nonhomogeneous conditions in a gaseous domain consisting of two infinite black plates are also included. The results show the suitability of the updated model parameters for such conditions and the increasing deviation error from the SNBM for existing WSGGMs when used outside of their temperature limits. The updated parameters achieve a mean deviation error from the SNBM of below 20% for most cases, which is at a range similar to previous works.

Insights into radiation property prediction for numerical simulation of pulverized coal/biomass oxyfuel combustion

Abstract The radiation property of flue gas in pulverized coal/biomass oxyfuel combustion distinguishes obviously from that in air combustion. Moreover, the particle emissivity and scattering factor can vary during its thermal conversion. Both phenomena challenge the accurate prediction of radiative heat transfer in coal/biomass oxyfuel combustion. As one solution to surmount this challenge, a new efficient exponential wide band model + particle radiation property model is proposed in this work. For validation, the proposed model is compared with other parallel models, and their predictions are compared against experimental data. It is found that the efficient exponential wide band model + particle radiation property model can give reliable predictions at different operating conditions. The maximum relative errors between the prediction and the experimental surface incident radiation are within 7% at the burner outlet and 2.5% at the peak point. Moreover, the iteration time consumptions are 0.55 and 0.87 s for the 0.5 MW case, and 35.45 and 35.66 s for the 600 MW case with the parallel radiation model and the proposed model. After validation, the feasibility and characteristics of the coal/biomass oxyfuel co-combustion process in a 600 MW tangentially fired boiler are predicted. It is found that the boiler can run stably and the CO2 mass fraction in the discharged flue gas can be around 90%.

Completion of Waste Heat Recovery and CO2 Conversion Simultaneously Based on the Flue Gas Chemical Recuperative Cycle: A Review

Energy shortage and greenhouse gas emission have become bottlenecks in current society development. Improving the efficiency of energy conversion and utilization systems through waste heat recovery and reduction of greenhouse gas through CO2 capture/conversion are important solutions. Both can be achieved simultaneously by utilizing high-temperature flue gas or CO2 in flue gas for organic matter gasification, which is called the flue gas chemical recuperative cycle. This paper provides a meaningful review of the latest advancements in the flue gas chemical recuperative cycle system, focusing on its application in diverse gasification systems for organic matters such as methane, sludge, etc. Additionally, this paper reviews methods for the integration of flue gas gasification into energy conversion and utilization systems under the application scenarios of gas turbine flue gas, air combustion flue gas, and oxy-fuel combustion flue gas. Subsequently, in order to improve the conversion efficiency of the chemical recuperative cycle, the applications of emerging gasification technologies in the field of the flue gas recuperative cycle, such as microwave gasification, plasma gasification, etc., are briefly summarized, offering an in-depth analysis of the mechanisms by which new methods enhance the process. Finally, the prospects and challenges of the field are discussed, and a comprehensive outlook is provided to guide future research.

Techno-economic analysis and life cycle assessment of renewable methanol production from MSW integrated with oxy-fuel combustion and solid oxide electrolysis cell

Techno-economic analysis and life cycle assessment of renewable methanol production from MSW integrated with oxy-fuel combustion and solid oxide electrolysis cell

Enhanced activity and SO2/H2O resistance of Co‐doping CeMnO3 perovskite for low-temperature mercury removal from oxy-fuel combustion flue gas

Enhanced activity and SO2/H2O resistance of Co‐doping CeMnO3 perovskite for low-temperature mercury removal from oxy-fuel combustion flue gas

A Review of Carbon Capture Technologies: Current Capture Technologies, Challenges, and Future Development

Nowadays, global warming has become one of the significant issues that humans are facing. Carbon capture technologies, as essential tools to mitigate carbon dioxide (CO₂) emissions, have been applied in power plants and industrial processes globally. This paper examines prevalent carbon capture technologies by reviewing the relevant principles and research progress in the field of carbon capture. Three combustion configurations: pre-combustion, post-combustion, and oxy-fuel combustion are elaborated in this review concerning carbon capture. Pre-combustion carbon capture extracts CO₂ before the combustion process, transforming the hydrocarbon fuels into syngas which are composed of CO₂ and hydrogen for later combustion. Post-combustion carbon capture aims to capture CO₂ after the combustions. Various techniques can be applied for carbon capture after the combustion, with chemical absorption and membrane separation widely used. Oxy-fuel combustion uses pure oxygen to accomplish the combustion so that the exhausted gases can mainly composed of CO₂ and water vapor, which is easy for CO₂ capture. This paper also highlights the critical role that carbon capture technologies will play in Carbon Capture and Storage (CCS) and emphasizes the current technology drawbacks. It provides a reference for future carbon capture studies and developments, which will be crucial for achieving international climate goals.

Numerical Analysis of Soot Dynamics in C3H8 Oxy-Combustion with CO2 and H2O

Oxygen-enriched combustion is increasingly recognized as a viable approach for clean energy production and carbon capture, offering substantial benefits for boosting combustion efficiency and mitigating pollutant emissions, which makes it widely adopted in various industrial applications. Liquefied petroleum gas (LPG), predominantly consisting of propane (C3H8), is commonly utilized in numerous combustion systems, yet its emissions of soot particulates have raised considerable environmental concerns. This study delves into the combustion dynamics and soot formation behavior of propane, the principal component of LPG, under oxy-fuel combustion conditions, with the inclusion of H2O and CO2, utilizing both experimental techniques and numerical simulations. The results reveal that CO2 and H2O suppress soot formation through distinct mechanisms. CO2 decreases soot nucleation and surface growth by lowering flame temperature and H atom concentration, but it minimally enhances soot oxidation. H2O significantly reduces soot formation by chemically increasing OH radical concentration, thereby enhancing soot oxidation. A detailed decoupling analysis further shows that CO2’s influence is predominantly thermal and chemical, resulting in lower OH levels and an elongated flame shape. In contrast, H2O’s substantial thermal and chemical effects decrease flame height and promote soot reduction. These insights advance the understanding of soot formation control in oxy-fuel combustion, offering strategies to optimize combustion efficiency and minimize environmental impact.

Multi-criteria evaluation of carbon capture technologies in steel, cement, petrochemical, and fertilizer industries: Insights for emerging and developed countries

Multi-criteria evaluation of carbon capture technologies in steel, cement, petrochemical, and fertilizer industries: Insights for emerging and developed countries

Development and modeling of technological scheme of steam methane reforming with oxy-fuel combustion and carbon capture

Development and modeling of technological scheme of steam methane reforming with oxy-fuel combustion and carbon capture

Novel CO2 capture pathway for SOFC-based distributed energy systems: Collaborative water-gas-shift membrane reactor and oxy-fuel combustion technologies

Novel CO2 capture pathway for SOFC-based distributed energy systems: Collaborative water-gas-shift membrane reactor and oxy-fuel combustion technologies

Effect of Reaction Conditions on Nitrogen Conversion During Char-O2/NO Combustion

ABSTRACT Nitrogen conversion during char-O2 combustion with a high initial-NO concentration (char-O2/NO combustion) is an important issue for low-NOx technologies and oxy-fuel combustion technologies, such as air/fuel-staged and flue gas recycling combustion. This study employed both experimental and numerical methods to investigate the mechanisms of N conversion and formation during char-O2/NO combustion. In the numerical model, the mass and heat transfer processes are governed by unsteady convection-diffusion partial differential equations. The numerical results agree well with the experimental findings, assuming NO is the sole primary N-containing product. Based on the numerical results, the effects of reaction conditions on N conversion were decoupled. As the O2/fuel stoichiometric ratio increases, the char-N release rate substantially rises, and the shrinkage of pore surface area becomes significant, leading to poorer NO reduction performance. With an increase in initial-NO concentration, the apparent conversion of char-N to NO decreases, while the NO reduction efficiency remains almost unchanged. Due to the lower temperature sensitivity of mass transfer limitations in the char-NO reaction compared to the char-O2 reaction, NO reduction performance is enhanced at higher reaction temperatures.

Oxy-Fuel combustion in an entrained flow reactor for regeneration of spent Calcium Looping sorbents

Calcium Looping (CaL) is one of the most promising technologies for large-scale CO2 capture of flue gases from power plants and industrial processes. A Ca-based sorbent, mostly CaO derived from limestone, is used to capture CO2 in the first step, while being regenerated in the second step. The aim of this study was to investigate the regeneration step of a novel CaL concept, which uses Ca(OH)2 as CO2 capture sorbent for backup power plants (“BackCap” concept). The spent sorbent after CO2 capture was calcined in an entrained flow reactor, using oxy-fuel conditions. In particular, the calcination degrees of the sorbent that were reached during a few seconds residence time in the reactor, were of main interest in this study. Therefore, experiments including parameter variations were carried out in a drop-tube and an entrained flow reactor to calcine the carbonated Ca(OH)2 particles. Calcination degrees of almost 0.6 were reached within the test facility used, while calcining in short residence times (i.e. <5 s) under oxy-fuel conditions. The experimental results obtained were implemented into a calcination model, indicating that full calcination of particles under oxy-fuel conditions is possible within reasonable residence time (i.e. 10 s).

Liquid air energy storage system with oxy-fuel combustion for clean energy supply: Comprehensive energy solutions for power, heating, cooling, and carbon capture

Liquid air energy storage system with oxy-fuel combustion for clean energy supply: Comprehensive energy solutions for power, heating, cooling, and carbon capture

Innovative Pathways in Carbon Capture: Advancements and Strategic Approaches for Effective Carbon Capture, Utilization, and Storage

Due to carbon dioxide (CO2) levels, driven by our reliance on fossil fuels and deforestation, the challenge of global warming looms ever larger. The need to keep the global temperature rise below 1.5 °C has never been more pressing, pushing us toward innovative solutions. Enter carbon capture, utilization, and storage (CCUS) technologies, our frontline defense in the fight against climate change. Imagine a world where CO2, once a harbinger of environmental doom, is transformed into a tool for healing. This review takes you on a journey through the realm of CCUS, revealing how these technologies capture CO2 from the very sources of our industrial and power activities, repurpose it, and lock it away in geological vaults. We explore the various methods of capture—post-combustion, oxy-fuel combustion, and membrane separation—each with their own strengths and challenges. But it is not just about science; economics play a crucial role. The costs of capturing, transporting, and storing CO2 are substantial, but they come with the promise of a burgeoning market for CO2-derived products. We delve into these financial aspects and look at how captured CO2 can be repurposed for enhanced oil recovery, chemical manufacturing, and mineralization, turning waste into worth. We also examine the landscape of commercial-scale CCS projects, highlighting both global strides and regional nuances in their implementation. As we navigate through these advancements, we spotlight the potential of Artificial Intelligence (AI) to revolutionize CCUS processes, making them more efficient and cost-effective. In this sweeping review, we underscore the pivotal role of CCUS technologies in our global strategy to decarbonize and forge a path toward a sustainable future. Join us as we uncover how innovation, supportive policies, and public acceptance are paving the way for a cleaner, greener world.