OCR Text |
Show are illustrated in Figs. 1 and 2, respectively. The combustion test furnace is a refractory wall furnace of the horizontal cylindrical type measuring 1,000 m m in diameter and 4,000 m m in length and provided with a large number of sampling holes in its circumferential and lengthwise directions. The experiment was conducted under the following standard combustion conditions: - -Oil** RO* M»tOf CD®®© dm Wlytcr Fig. 1. Layout of experimental apparatus 5-UflUMl Fig. 2. Combustion test furnace Ounpwlon of NOi / / guilpHWlM 0# thonnoJ Nl* •* < /: \\N\ \ \ \ \ \ ft* NOx J* Drop of epJinHnOJi Raductton In oloy Mmo of 9*o bi high tamp. Lov-ooygon oomfaftf Ion Uoo of low-nltiooon fuol Heat input : 40 x 104 kcal/far. Furnace temperature? 1,300°C Secondary air temperature Excess air ratio Fuel : 320°C : 1.16 (excess 0 2 concentration 3%) : Butane, C-heavy oil, coke oven gas Fig. 3. Principle of N O x Suppression Combustion gas was sampled by a water-cooled probe which is located in the flue at 3 meters down-stream from the outlet of the test furnace and then analyzed by means of the chemiluminescenee type N O x continuous analyzer of Yanagimoto make and magnetic type O^ continuous analyzer also of Yanagimoto make. For temperature measurement, a tfO. 5 P R thermocouple was used, but temperature correction was not done' for radiation, etc. And for measurement of flame radiant heat flux, a radiometer (having visual angle of 7° and spectral sensitivity range of 0.3 to 6.5 microns) of HY-CAL. Engineering make was usedo Besides, a high-temperature hot-wire current meter of Sogo Electron make was used for measurement of velocity of flow. Incidentally, 11% or 4% 0 2 corrected value obtained from expression (1) was used for the N O x value. The expression of correction to N O x reference 0 2 % is as follows: 21-COo^ NOx s=21 -^02> x N O x e ( p p m) (D Where, (NOx] S : N O x value corrected to reference excess o2 % C^z^s s Reference excess O2 %, low N O x 11- 2 - |