| OCR Text |
Show 2 This paper describes the experimental analysis and the numerical simulation to understand the mechanism of combustion using high temperature fuel gas and to investigate the heat distribution by the combustion, and presents the method to determine the flame length. 2.Experimantal Analysis 2.1 Apparatus Experimental investigations have been carried out on the test rig made of the pipe with inner dimensions of 3600 millimeter long by 90 millimeter in diameter. The inlet of the rig was connected with a electromagnetic induction furnace to heat the fuel gas (CO/N2). For combustion of the fuel gas, a 02/N2 burner is installed in the vicinity of the rig inlet. Ten sampling probes are located on the rig, and C0.C02 and 0 2 analyzers are employed in the experiments. 2.2 Set-up, Procedure and Conditions The experimental set-up is schematically shown in Fig.1. Several kinds of fuel gas are made by mixing C O and N2 gas. The gas temperature is controlled at 600°C by the electromagnetic induction furnace. The oxidized gas is made by mixing 0 2 and air. The gas is injected into the rig thorough the 02/N2 burner nozzle with 7.6 or 12.4 millimeter in inner diameter. All experiments were conducted in the conditions where the fuel gas flow rate were 10 Nm3/Hr. The overall stoichiometric ratio for the combustion was kept 1.1 by adjusting the 0 2 flow rate. Gas samples were taken using the sampling probes, and sent to gas analyzers to measure C0,C02 and 02 concentrations. The radial concentration profiles were measured at three positions, 22.5 , 45 and 67.5 millimeter from the top end of the inner surface of the rig. The axial concentration profiles were derived by averaging the radial concentration profiles on each sampling position. The experiments were conducted in seven different conditions shown in Table 1. Table 1 No 1 2 3 4 5 6 7 Fuel gas CO 3.6 NmVHr 3.6 NmVHr 5.4 NmVHr 1.8 NmVHr 1.0 NmVHr 3.6 NmVHr 3.6 NmVHr N2 5.4 NmVHr 5.4 NmVHr 3.6 NmVHr 7.2 NmVHr 9.0 NmVHr 5.4 NmVHr 5.4 NmVHr %CO in fuel gas 40% 40% 60% 20% 10% 40% 40% Oxidized gas air 9.4 NmVHr 9.4 NmVHr 14 NmVHr 4.7 NmVHr 2.6 NmVHr 3.8 NmVHr 1.7 NmVHr 02 0 0 0 0 0 1.2 NmVHr 1.6 NmVHr %02 in oxid. gas 21% 21% 21% 21% 21% 40% 60% nozzle dia.. 7.6 mm 12.7 mm 12.7 mm 12.7 mm 12.7 mm 12.7 mm 12.7 mm |
