| 摘要 |
PURPOSE:To continue the burning under the gentle igniting condition only within required accurate time regardless of a large or small flame, and simplify the moving to a main igniting by providing a timer for confirming of burning cut-off, the timer is started at the detection of the flame naught with a flame detector, the timer measures the constant timer time, further, the timer is reset for the time measuring action at every time when the flame existence is detected during time measuring. CONSTITUTION:In a gentle igniting process, a shut-off valve 13 is fully opened at a step 308, a flow rate adjusting valve 15 is slightly opened, therefore, an igniter 16 is operated at a step 309, further, the igniter is operated repeatedly until the flame existence is detected at a step 310 or the passage of time in a safety switch is confirmed at a step 311. Under this condition, when the flame existence is detected with a flame detector 17, a step 312 is performed, a timer for confirming of the gentle igniting time passage is started. Thereafter, the timer continues the time measuring under the flame existence conditions at a step 313, then the process is moved to the main igniting condition downward from a step 316. On the other hand, when the flame existence is detected with the flame detector within the presetting time T1, the timer is reset at a step 315, thereafter, returned to a prepurge process at a step 306. |
