The Effect of Distance between the Fuel and Air Nozzles on NO_x Emission from High Temperature Air Combustion(Thermal Engineering)

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  • NADA Yuzuru
    Department of Mechanical Engineering, Toyohashi University of Technology
  • ZENMAN Yasutomo
    豊橋技術科学大学大学院機械システム工学専攻
  • NODA Susumu
    Department of Mechanical Engineering, Toyohashi University of Technology

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Other Title
  • 高温空気燃焼のNO_x排出特性に対するノズル間隔の影響(熱工学,内燃機関,動力など)
  • 高温空気燃焼のNOx排出特性に対するノズル間隔の影響
  • コウオン クウキ ネンショウ ノ NOx ハイシュツ トクセイ ニ タイスル ノズル カンカク ノ エイキョウ

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For the high temperature air combustion (HiTAC), fuel nozzles are commonly located away from an air nozzle. The emission of NO_x from the HiTAC furnace is thought to be related to the distance between these nozzles (ΔL). Objectives of present study are to clarify the effect of ΔL on the NO_x emission. Measurements of the NO_x emission are made in the cylindrical furnace. Propane is issued from the two nozzles located at three different distances from the air nozzle. Preheated temperature of air is up to 1263K. The emission index of NO_x (EINO_x) decreases as an increase in ΔL. The large ΔL enhances the dilution by the burned gas, which leads to a decrease in flame temperature. The decrease of EINO_x is attributed to the decrease in flame temperature. The EINO_x characteristic is evaluated by the residence time and flame temperature. Dilution ratio is introduced to quantify the magnitude of dilution by the burned gas. The flame temperature is predicted by the modified flamelet model with the dilution ratio. The residence time and the dilution ratio are as a function of ΔL. The overall NO_x production rate is found to scale with the flame temperature predicted by the modified flamelet model.

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