| OCR Text |
Show 5. Low 0^ Combustion Characteristics To find out combustibility in the radiant tube, investigation was made by using a test furnace on sooty smoke at low 0-, combustion of LNG which was one of the worst combustible gases. The sooty smoke was measured with a Bacharach smoke meter and evaluated by means of the smoke number. Fig. 6 shows the test results obtained for the 7B-W type radiant tube. In general, as the temperature of an actual furnace rises (naturally the radiant tube is also heated) the preheated air temperatures rises and combustibility is improved in the actual furnaces. Whereas, in the test furnace, the relation between temperature of the furnace and radiant tube is different from that in the actual furnace, and therefore, Bacharack Smoke Number in Fig. 6 is evaluated using the temperature of the radiant tube. The test result indicates that KS-2 Burner excels in low 02 combustibility even at low turndown and its Bacharach Smoke Number is much more improved than that for the ordinary burner. Similarly Fig. 7 shows the relation between the Smoke Number and excess 09 (%) in the exhaust gas, indicating that KS-2 Burner has excellent combustibility even when 09 < 2%. 1.9.12 |
