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RESEARCH PAPERS

# Sensitivity Analysis of a FGR Industrial Furnace for $NOx$ Emission Using Frequency Domain Method

[+] Author and Article Information
Qing Jiang

Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9

Chao Zhang1

Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9zhangc@engga.uwo.ca

Jin Jiang

Department of Electrical and Computer Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9

1

Corresponding author.

J. Energy Resour. Technol 129(2), 134-143 (May 21, 2005) (10 pages) doi:10.1115/1.2141636 History: Received August 19, 2003; Revised May 21, 2005

## Abstract

Preliminary study has shown that the flue gas recirculation (FGR) is one of the effective ways to reduce the nitric oxides ($NOx$) emission in industrial furnaces. The sensitivity of the $NOx$ emission from a FGR industrial furnace to the change in three major furnace input variables—inlet combustion air mass flow rate, inlet combustion air temperature, and pressure head of the FGR fan—is investigated numerically in this study. The investigation is carried out in frequency domain by superimposing sinusoidal signals of different frequencies on to the furnace control inputs around the design operating condition, and observing the frequency responses. The results obtained in this study can be used in the design of active combustion control systems to reduce $NOx$ emission. The numerical simulation of the turbulent non-premixed combustion process in the furnace is conducted using a moment closure method with the assumed $β$ probability density function for the mixture fraction. The combustion model is derived based on the assumption of instantaneous full chemical equilibrium. The discrete transfer radiation model is chosen as the radiation heat transfer model, and the weighted-sum-of-gray-gases model is used to calculate the absorption coefficient.

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## Figures

Figure 3

Temperature contour (K) on the plane at z=0m

Figure 4

NO contour (mole fraction) on the plane at z=0m

Figure 5

NO emission as the combustion air mass flux is varied

Figure 6

NO emission as the temperature of the combustion air is varied

Figure 7

NO emission as the pressure head of the FGR fan is varied

Figure 1

Configuration/dimension of the FGR furnace (unit: m)

Figure 2

Velocity vector on the plane at z=0m

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