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Show Reexamination of Fuel-NO Reduction in a Gas-fired Furnace H.K. MA1 and K.C.PAN2 Department of Mechanical Engineering National Taiwan University Taiwan, R.O.C. W.B. LEE3 Power Research Institute Taiwan Power Company A B S T R A CT This study tries to examine the effects of temperature and air flow on the conversion yield of fuel N O in a gas-fired furnace. In the experiment, N O was add in natural gas. The added N O can be considered as the nitrogen-bearing component in the fuel. Tests,included changing air flow rate, adding cooling water, and adding staged air were performed to characterize and optimize the fuel-rich burning zone and the fuel-lean burnout zone independently. Detailed measurements of 02, CO2, CO, NO, and NOx were made at the fuel-rich burning zone and furnace exit.The .effects of operation conditions on fuel N O conversion yield were detailed examined. Results indicated that adding staged air in the fuel-rich burning zone (L / D = 5) will decrease the N O conversion yield. Adding cooling water in a right position may further decrease the N O conversion yield and lower the N O emissions. And, the conversion yield of N O will drop as increasing the initial N O concentration. In addition, the least conversion yield of nitrogen oxides in the fuel rich first stage burning zone will occur at the stoichiometric ratio's inverse value,( <P -j )"1,0.66 to 0.76. 1. Associate professor, to whom all correspondences should be addressed. 2. Graduate Student 3. Engineer 1 111-17 |