Effect of Reagent Injection Amount and Hole Size on NOx Reduction by SNCR in a CO Boiler

CHUN-, LANG YEH (2014) Effect of Reagent Injection Amount and Hole Size on NOx Reduction by SNCR in a CO Boiler. In: International Conference on Advances In Mechanical, Aeronautical and Production Techniques - MAPT 2014, 02 - 03 August, 2014, Kuala Lumpur, Malaysia.

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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 smallest. However, on the condition of fixed amount of reducing agent injected, NOx concentration is not significantly influenced by the injection hole size of reducing agent. On the other hand, when reducing agent is injected from 3.6m behind the boiler inlet, NOx concentration is not significantly influenced by the injection hole size of reducing agent.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: CO boiler; Combustion; Fluid Flow; SNCR; NOx Reduction
Depositing User: Mr. John Steve
Date Deposited: 28 May 2019 09:25
Last Modified: 28 May 2019 09:25
URI: http://publications.theired.org/id/eprint/2854

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