Optimized enriched CO2 recycle oxy-fuel combustion for high ash coals

Seepana, Sivaji; Jayanti, S.

doi:10.1016/j.fuel.2009.04.029

Cited by 37 publications

(18 citation statements)

References 7 publications

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“…The recycled flue gases replaces the N 2 in the combustion air and are used to lower the flame temperature 12,13 . The combustion process generates a high CO 2 concentration stream suited to sequestration, after flue-gas pretreatments 14 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Sabia

Sorrentino²,

Chinnici

et al. 2015

Energy Fuels

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The oxidation process of CH 4 /O 2 mixtures diluted in CO 2 under MILD/Oxy-fuel conditions was numerically investigated in a perfectly stirred flow reactor at atmospheric pressure. The analysis aimed to investigate the kinetics involved in fuel oxidation in systems highly diluted and strongly pre-heated. Particular attention was focused on the effects of CO 2 on oxidation routes because it can significantly alter the kinetic pathways participating directly in key reactions, or indirectly in termolecular reactions as a third body species. Furthermore, adiabatic flame temperatures are lower with respect to air conditions because of the higher thermal heat capacity of CO 2 in comparison to N 2 , thus modifying the kinetics promoted by temperature in combustion processes. The analyses were realized as a function of main system parameters, systematically changing inlet temperatures and mixture compositions.Results showed the establishment of complex dynamic behaviors in terms of temperature oscillations for both lean and rich fuel mixtures, in both non-adiabatic and adiabatic conditions. Further numerical analyses were performed to highlight the kinetic aspects of the problem. Simulations suggested that in fuel lean conditions, the dynamics observed are related to the H 2 /O 2 sub-system reactions independently of diluent nature, while, for fuel rich mixtures diluted in carbon dioxide, the CO 2 decomposition to CO and CH 3 recombination to ethane are key reactions for the onset of temperature oscillations.

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Section: Introductionmentioning

confidence: 99%

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Sabia

Sorrentino²,

Chinnici

et al. 2015

Energy Fuels

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“…The latter is performed by means of a CO2 compression and purification unit (CO2CPU). A great deal of work to date has focused on optimising the combustion process (Edge et al, 2011;Seepana and Jayanti, 2012;Tan et al, 2006) and minimising the energy penalty caused by the ASU which is usually around 5 percentage points (Boot-Handford et al, 2014). In contrast, little work has been undertaken on reducing the energy penalty caused by the CO2CPU which, through this study, is also found to fluctuate by around 5 percentage points.…”

Section: Modelling Methods and Assumptionsmentioning

confidence: 99%

Cost and performance of some carbon capture technology options for producing different quality CO 2 product streams

Porter

Fairweather

Kolster

et al. 2017

International Journal of Greenhouse Gas Control

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A techno-economic assessment of power plants with CO2 capture technologies with a focus on process scenarios that deliver different grades of CO2 product purity is presented.The three leading CO2 capture technologies are considered, namely; oxyfuel combustion, pre-combustion and post-combustion capture. The study uses a combination of process simulation of flue gas cleaning processes, modelling with a power plant cost and performance calculator and literature values of key performance criteria in order to evaluate the performance, cost and CO2 product purity of the considered CO2 capture options. For oxyfuel combustion capture plants, three raw CO2 flue gas processing strategies of compression and dehydration only, double flash system purification and distillation purification are considered. Analysis of pre-combustion capture options is based on integrated gasification combined cycle plants using physical solvent systems for capturing CO2 and sulfur species via three routes; co-capture of sulfur impurities with the CO2 stream using Selexol TM solvent, separate capture of CO2 and sulfur impurities using Dedication: This paper is dedicated to the memory of our friend and colleague, Dr. Robert M. Woolley, who made a significant input to the CO2QUEST project and whose expertise, commitment and great humour will never be forgotten.

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“…12 The thermodynamic calculations were based on the assumption of a steady-state operation at the required thermal loading. Each component of the layout was treated as a control volume and mass and energy balance conditions were imposed on it.…”

Section: Thermodynamic Analysis Of the Oxy-coal Plantsmentioning

confidence: 99%

“…Thermodynamic analysis leading to the evaluation of the flame temperature and the boiler inlet and exit concentrations for two cases has been carried out using a MATLAB code using the methodology outlined in Seepana and Jayanti. 12 The thermodynamic calculations were based on the assumption of a steady-state operation at the required thermal loading. Each component of the layout was treated as a control volume and mass and energy balance conditions were imposed on it.…”

Section: Plant Layout Considerations In Retrofittingmentioning

confidence: 99%

“…Knowledge of these effects is essential to design boilers for oxycoal combustion and to consider the retrofitting possibilities of existing boilers to operate in oxy-coal combustion mode so as to facilitate CO 2 sequestration. [11][12][13][14] For a country like India with a burgeoning demand for electricity, retrofitting existing boilers to implement carbon capture technology is an important and necessary condition to reduce CO 2 emissions in the near future.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of retrofitting possibility of an Indian pulverized coal boiler for operation with Indian coals in oxy-coal combustion mode with CO₂ sequestration

Jayanti

Saravanan

Sivaji

2012

Proceedings of the Institution of Mechanical Engineers, Part A:

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Coal is the mainstay of electrical power generation in India. In this study, an experimental and theoretical assessment is made of the possibility of retrofitting an existing pulverized coal boiler for operation in oxy-coal mode. Experiments have been conducted using non-isothermal thermogravimetric analysis for a typical Indian coal to assess its reactivity under simulated oxy-coal combustion. Computational fluid dynamics simulations of a tangentially fired, 210 MWe pulverized coal boiler of a typical Indian design have been carried out with a typical Indian coal composition to study the relative effect of oxy-coal mode operation on the flow and heat transfer characteristics within the boiler. A process flow diagram has been developed for a 662 MWt power plant to include a retrofitted boiler and CO 2 sequestration. It is concluded that a 70:30 volumetric mix of CO 2 to O 2 in the oxidizer composition will leave the essential features of the flow, temperature and heat transfer characteristics more or less unchanged, thus enabling retrofitting. An overall thermal efficiency loss of 11% is estimated for a retrofitted plant which delivers a flue gas which does not require chemical means of CO 2 sequestration.

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Optimized enriched CO2 recycle oxy-fuel combustion for high ash coals

Cited by 37 publications

References 7 publications

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Cost and performance of some carbon capture technology options for producing different quality CO 2 product streams

Assessment of retrofitting possibility of an Indian pulverized coal boiler for operation with Indian coals in oxy-coal combustion mode with CO₂ sequestration

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Optimized enriched CO2 recycle oxy-fuel combustion for high ash coals

Cited by 37 publications

References 7 publications

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO2

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO2

Cost and performance of some carbon capture technology options for producing different quality CO 2 product streams

Assessment of retrofitting possibility of an Indian pulverized coal boiler for operation with Indian coals in oxy-coal combustion mode with CO2 sequestration

Contact Info

Product

Resources

About

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Assessment of retrofitting possibility of an Indian pulverized coal boiler for operation with Indian coals in oxy-coal combustion mode with CO₂ sequestration