Framework for a Robust Predictor of NOx Emissions from Pulverised Coal Combustion PDF Download
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Author: R. D. C. Smith
Publisher:
ISBN:
Category : Coal, Pulverized
Languages : en
Pages : 22
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Book Description
Author: R. D. C. Smith
Publisher:
ISBN:
Category : Coal, Pulverized
Languages : en
Pages : 22
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Book Description
Author: R.D.C. Smith
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 40
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Book Description
Author: R.D.C. Smith
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 22
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Book Description
Author: R. D. C. Smith
Publisher:
ISBN:
Category : Coal, Pulverized
Languages : en
Pages : 40
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Book Description
Author: R. D. C. Smith
Publisher:
ISBN:
Category : Coal, Pulverized
Languages : en
Pages : 22
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Book Description
Author: Niko Hachenberg
Publisher:
ISBN:
Category : Coal-fired power plants
Languages : en
Pages : 270
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The purpose of this research work was to develop a transferable mathematically simple model which gives the possibility to make fast and easy predictions regarding the NOx emission behavior of a broad-spectrum of coals within a certain combustion environment. In this context, this thesis is a further step of a common ongoing investigation focused on predicting NOx emissions from self-sustaining, pulverized coal combustion in dry bottom firing systems. A comprehensive literature research focused on already published NOx prediction approaches from scientific publications based on fundamental quantitative relationships or empirical algorithms and statistical relationships was also carried out in this context. This research concentrated on three specific areas which were found to constitute a major gap in the knowledge of NOx formation in industrial full-scale applications: the fuel properties; the dependence of furnace geometry factors; and the specific operating conditions. The developed model shows a strong statistical significance with a coefficient of determination of 0.9876 and a standard error of 28 mg / m3 STPdry at 6 % O2 based on 142 observations coming from 28 utility boilers. Direct comparisons between model history and observations reported by other researchers have also shown very good conformities. For that background, this thesis form a good basis for identifying individual factors which contributes to system related NOx emissions in order to investigate how variations in the process parameters affect the emission level. Perhaps, as contribution to the understanding of NOx formation during coal combustion what is still an imperfectly understood phenomenon, or as basis for possible process optimization which might find application on pulverized coal-fired boilers to make the world a little bit more green.
Author: Ruksana Moreea-Taha
Publisher:
ISBN:
Category : Coal-fired power plants
Languages : en
Pages : 60
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Author: Stuart C. Mitchell
Publisher:
ISBN: 9789290293071
Category : Air
Languages : en
Pages : 54
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Author:
Publisher: Cuvillier Verlag
ISBN: 3736909381
Category : Technology & Engineering
Languages : de
Pages : 180
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ABSTRACT The current work briefly reviews the formation mechanisms and reduction approaches of the pollutants SOx and NOx in coal combustion and focuses on the simulation of the lower-cost in-furnace measures ƒ{ the dry additive process (DAP) for SOx reduction and the reburning as well as the advanced reburning (hybrid reburning/SNCR) techniques for NOx reduction. In addition, the influence of sulfur compounds on NOx formation is investigated. The major workings include: Simulation of the dry additive desulfurization process (DAP): Different models ƒ{ shrinking core model (SCM), pore model (PM) and grain model (GM) ƒ{ are implemented to describe the gas-particle reaction. Relevant processes such as the sintering of the additive, the self-retention by coal ash, the thermal equilibrium of the sulfation reaction are accounted for and modeled. A comprehensive model for the DAP with calcium based additives is subsequently established and integrated into a combustion CFD (computational fluid dynamics) code AIOLOS, in both Eulerian and Lagrangian schemes. The model is verified with experiments on a test reactor. Mechanism reduction and simulation of reburning/SNCR Processes: A method for reduction of kinetic mechanisms is introduced. A program tool is developed for automatic reduction of detailed reaction mechanisms. Reduced mechanisms for reburning and hybrid reburning/SNCR processes are developed and implemented into the CFD code. CFD-calculations with the reduced mechanisms are performed and compared with experimental measurements to comprehensively evaluate the simulation approach. It is shown that the detailed simulation is capable of modeling the complex reburning and SNCR processes with acceptable computing time and achieves reasonable results in wide parameter ranges. Study of the influence of sulfur compounds on NOx formation: The effect of SO2 on NOx formation is experimentally investigated and analysed with kinetic mechanisms. It is indicated that the presence of SO2 inhabits the NOx formation and reduce the NOx emissions in normal air-rich combustion. Under air-staging conditions, SO2 addition has no obvious influence on the final NOx emissions.
Author: C. R. McCann
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 8
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Book Description
