| 摘要 |
PROBLEM TO BE SOLVED: To obtain a method for executing switching to a commercial power supply in a short time upon interruption of a power supply for speed variable control without changing furnace internal pressure for a boiler, etc. SOLUTION: An operation parameter is prepared previously using as variables electric motor revolutions (x) (20), a fuel kind z1 (21), a fuel flow rate z2 (22), and an air flow rate z3 (23) as combustion conditions of a boiler, and is automatically adjusted and outputted (24) on the basis of the electric motor revolutions and the combustion conditions. A lookup table is prepared and stored (28) by calculating and setting commerical power supply connection delay time y1 (25) upon its switching, damper control time y2 (26), and a damper target opening y3 (27) as an optimum switching condition when the control is changed over to the commerical power supply. When a variable speed control power supply is interrupted, the lookup table is retrieved taking as a base the electric motor revolutions and the combustion conditions thereupon, and a corresponding changeover condition is outputted, and further the switching conditions are set for switching processing (29). |
