EFFECT OF REAGENT INJECTION AMOUNT AND HOLE SIZE ON NOX REDUCTION BY SNCR IN A CO BOILER
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL, AERONAUTICAL AND PRODUCTION TECHNIQUES
Author(s): CHUN-LANG YEH
Abstract: This study investigates numerically the NOx reduction by SNCR in a CO boiler. The combustion and fluid flow in the FPC CO boiler is examined with emphasis on the effects of injection amount and hole size of reducing agent on NOx reduction. Simulation results indicate that NOx is formed mainly in the high temperature region near the boiler inlet where the mixing caused by swirler is strong. When reducing agent is injected from the boiler inlet, NOx reduction efficiency increases with the amount of reducing agent but gradually levels off. When the amount of reducing agent is increased to 2.5 times the default value, NOx reduction efficiency is 53%. On the other hand, when reducing agent is injected from 3.6m behind the boiler inlet, NOx concentration is not significantly influenced by the amount of reducing agent injected. Finally, when reducing agent is injected from the boiler inlet, the best NOx reduction efficiency is achieved when the size of reducing agent injection hole is the sma
- Publication Date: 21-Dec-2014
- DOI: 10.15224/978-1-63248-008-8-85
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FLOW STUDY AND DESIGN ANALYSIS OF A SAFETY VALVE-VENT PIPE
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL, AERONAUTICAL AND PRODUCTION TECHNIQUES
Author(s): MUHAMMAD HANAFI MD SAH , SHEIKH HUSSAIN SHAIKH SALLEH , SRITHAR RAJOO , ALIAS MOHD NOOR
Abstract: Discharge of a large volume of steam from a boiler to atmosphere is a complicated and risky task. It can cause damage to equipment or even injury to personnel in the vicinity. A device was designed, based on the arrangement of a valve and vent pipe junction, such that no excessive load arising from the thermal expansion or reaction induced movement is transmitted back to the valve discharge branch, thus avoiding valve malfunction. Specimens were designed and fabricated to satisfy the actual working conditions. Both air and steam were used in the experimental works. Theoretical and experimental results were then studied on the flow phenomenon of the connection. This study leads to a design analysis of the safety valve-vent pipe. The results have shown good correlations between the theoretical and experimental results and thus lead to the prediction of valve-vent pipe sizing.
- Publication Date: 21-Dec-2014
- DOI: 10.15224/978-1-63248-008-8-79
- Views: 0
- Downloads: 0