Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications

Selective Non-Catalytic Reduction (SNCR) of nitric oxide was studed experimentally by injecting different concentrations of aqueous urea solution in a pilot-scale diesel fired tunnel furnace at 3-4 % excess oxygen level and with low ppm of baseline NO, ranged from 65 to 75 ppm within the investigate...

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Main Author:	Abul Hossain, Khandoker
Format:	Thesis
Language:	English
Published:	2004
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/5393/1/KhandokerAbulHossainMFKM2004.pdf
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spelling	my-utm-ep.53932018-03-07T21:00:13Z Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications 2004-02 Abul Hossain, Khandoker TJ Mechanical engineering and machinery Selective Non-Catalytic Reduction (SNCR) of nitric oxide was studed experimentally by injecting different concentrations of aqueous urea solution in a pilot-scale diesel fired tunnel furnace at 3-4 % excess oxygen level and with low ppm of baseline NO, ranged from 65 to 75 ppm within the investigated temperature range. The furnace simulated small-scale combustion systems such as low capacity boilers, hot water heaters, oil heaters, etc., where the operating temperatures are usually in the range of about 973 to 1323 K and NO, emission level remains below 100 ppm. In order to investigate the influence of additive on reduction characteristics, different concentrations of commercial grade sodium carbonate (Na2C03) were added to urea solution. The significant aspects of the studies are that it employed commercial grade urea as NOx reducing agent and commercial grade Na2C03 as addtive to urea solution to minimize the cost of the SNCR operation. NOx reductions were studied with the variation of different parameters such as injection temperature, residence time, Normalized Stoichiometric Ratio (NSR) of the reagent, camer gas pressure, etc. A significant amount of NOx reduction was achieved which was not pronounced by the previous researchers with urea SNCR for this low ppm of NO,. With 5% plain urea solution, at an NSR of 4 as much as 54% reduction was achieved at 1128 K, whilst in the additive case the NOx reduction was improved to as much as 69% at 1093 K. Apart from this improvement, in the additive case, the effective temperature window as well as peak temperature of NO, reduction shfted towards lower temperatures. The ammonia slip measurements showed that in both cases the slip was below 16 ppm at NSR of 3 and optimum temperature of NOx reduction. Finally, the investigations demonstrated that urea based SNCR is quite applicable to small-scale combustion applications and commercial grade urea and sodium carbonate are potential NOx reducing agent and additive respectively. 2004-02 Thesis http://eprints.utm.my/id/eprint/5393/ http://eprints.utm.my/id/eprint/5393/1/KhandokerAbulHossainMFKM2004.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abul Hossain, Khandoker Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications
description	Selective Non-Catalytic Reduction (SNCR) of nitric oxide was studed experimentally by injecting different concentrations of aqueous urea solution in a pilot-scale diesel fired tunnel furnace at 3-4 % excess oxygen level and with low ppm of baseline NO, ranged from 65 to 75 ppm within the investigated temperature range. The furnace simulated small-scale combustion systems such as low capacity boilers, hot water heaters, oil heaters, etc., where the operating temperatures are usually in the range of about 973 to 1323 K and NO, emission level remains below 100 ppm. In order to investigate the influence of additive on reduction characteristics, different concentrations of commercial grade sodium carbonate (Na2C03) were added to urea solution. The significant aspects of the studies are that it employed commercial grade urea as NOx reducing agent and commercial grade Na2C03 as addtive to urea solution to minimize the cost of the SNCR operation. NOx reductions were studied with the variation of different parameters such as injection temperature, residence time, Normalized Stoichiometric Ratio (NSR) of the reagent, camer gas pressure, etc. A significant amount of NOx reduction was achieved which was not pronounced by the previous researchers with urea SNCR for this low ppm of NO,. With 5% plain urea solution, at an NSR of 4 as much as 54% reduction was achieved at 1128 K, whilst in the additive case the NOx reduction was improved to as much as 69% at 1093 K. Apart from this improvement, in the additive case, the effective temperature window as well as peak temperature of NO, reduction shfted towards lower temperatures. The ammonia slip measurements showed that in both cases the slip was below 16 ppm at NSR of 3 and optimum temperature of NOx reduction. Finally, the investigations demonstrated that urea based SNCR is quite applicable to small-scale combustion applications and commercial grade urea and sodium carbonate are potential NOx reducing agent and additive respectively.
format	Thesis
qualification_level	Master's degree
author	Abul Hossain, Khandoker
author_facet	Abul Hossain, Khandoker
author_sort	Abul Hossain, Khandoker
title	Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications
title_short	Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications
title_full	Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications
title_fullStr	Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications
title_full_unstemmed	Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications
title_sort	study of urea based selective non-catalytic reduction of nox in small scale combustion applications
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2004
url	http://eprints.utm.my/id/eprint/5393/1/KhandokerAbulHossainMFKM2004.pdf
_version_	1747814590090051584

Study of urea based selective non-catalytic reduction of NOx in small scale combustion applications

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