NDLI: Reduction characteristics of NOX emissions by optimal urea injection rate in a LPG steam boiler with urea-SCR reactor

Content Provider	IEEE Xplore Digital Library
Author	Myung-whan Bae Woo-cheol Kang Byeong-ho Song Jae-ok Bae
Copyright Year	2012
Description	Author affiliation: School of Mechanical Engineering, Engineering College, Gyeongsang National University, Jinju, Republic of Korea (Myung-whan Bae) \|\| School of Mechanical and Aerospace Engineering, Graduate School, Gyeongsang National University, Jinju, Republic of Korea (Byeong-ho Song) \|\| Department of Helicopter Maintenance, Changsin College, Changwon, Republic of Korea (Woo-cheol Kang) \|\| School of Mechanical Engineering, Pusan National University, Republic of Korea (Jae-ok Bae)
Abstract	The aim of this study is to develop the urea-SCR reactor aftertreatment system for reducing NOX emissions in a LPG steam boiler. The urea-SCR system utilizes ammonia converted from 17% aqueous urea solution injected in front of the SCR catalyst as a reducing agent for reducing NOX emissions. In this study, NOX emissions and exhaust gas temperatures according to boiler load were measured and compared with before and after urea injection in a LPG steam boiler with urea-SCR reactor. Also, the equivalence ratio, urea injection rate, ammonia slip and NOX conversion rate relative to boiler load were investigated. The equivalence ratio is different by changing the fuel consumption rate or intake air rate. In this experiment, the average equivalence ratio is calculated by changing only fuel consumption rate while the intake air rate is constantly fixed at 25,957.11 $cm^{3}/sec.$ The average equivalence ratios are 1.38, 1.11, 0.81 and 0.57 when boiler loads are 100, 80, 60 and 40%. In this experiment, NOX conversion rates are calculated by 89, 85, 77 and 79% in cases of the boiler loads of 100, 80, 60 and 40%. NOX conversion rate is raised with increasing urea injection rate, and NH3 slip is boosted at the same time. Consequently, the optimal urea injection rate for the respective boiler load should be determined by considering NOX conversion rate and NH3 slip simultaneously. In this study, the urea flow rates of 230, 235, 233 and 231 mg/min are injected at the boiler loads of 100, 80, 60 and 40%, and the final NH3 slips are measured by 8.48, 5.58, 11.97 and 11.34 ppm at the same conditions.
Starting Page	642
Ending Page	646
File Size	527790
Page Count	5
File Format	PDF
ISBN	9781467301985
e-ISBN	9781467301992
DOI	10.1109/ICSAI.2012.6223079
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-05-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thyristors Equivalence ratio LPG steam boiler Boilers Educational institutions Urea-SCR reactor Combustion NOX conversion rate Fuels Inductors Temperature measurement NOX emissions Optimal urea injection rate NH3 slip
Content Type	Text
Resource Type	Article

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