OCR Text |
Show / In case that some problems are detected by self-diagnosis, alarm functions operate. Alarm functions are classified into 3 pattern alarm levels such as trouble alarm, major and minor alarm. This function can be utilized to discover faulty operation earlier and to prevent occurrence of defective treated products and furnace accident. And this intel I igent burner system i s additional ly provided with communication functions such as data setup, remote operation, etc. 4. Characteristic test results (1) Turndown Characteristic 5 o •e O Residual 0 -, | • I v t ! 1,8m, is - z % - 3% - i I 1 1 * II in i 1.05 1.10 1.15 Gas Flow(m N'h) Air Flow(m N/ h) W h I Residual 0,"i Air Ra 0.0 | h l' 21.8 J^ - < t i I I Gas Flow 2.5 J 5.0 9.0m3, • ^~l Air FlowJ h ' P 7.5 1 0.0 •+ 109rj J i3N h - • 0 25 50 75 100 125 Iri g.6 Turndown characteristic | >*&*««** S CM a. O O Dombustion Capacity lOO't \ir ratio 1.1 3A city gas 1 1- n o o 3 a. S O o 1- sss«sss«Kas»£ 3 C I n e o - Points to Fig'. 6 (1) Gas and air flow are free from "delay", "overshoot", and "undershoot" even when TIC output changed rap i d I y, then perfect I y fo I I ow i ng T IC output. (2) The air ratio is kept constant. Result Even under an operating condition with load fluctuation, turndown follows perfectly the TIC output variation with keeping target air ratio, whereby accurate control is ensured. |