| 摘要 |
PURPOSE:To properly control an air flow rate for each burner, by effecting control of air flow rate distribution for each burner separately from a total air flow rate control in such manner that a burner damper of largest opening amount may be permitted to open widely, in a furnace equipped with a plurality of burners. CONSTITUTION:In a furnace 2 equipped with a plurality of burners 1a-1c, a main air drawing pipe 4 including an air drawing fan 3 is branched off to pipes 5a-5c according to the number of burners. A signal instructing a total air flow rate and a signal developed by a total air flow rate signal generator 7 are introduced into a regulator 8 adapted to regulate a total air flow rate, actuating a total air flow rate manipulator 9 to regulate the opening of the air-intake damper 10 for the air drawing fan 3. On the other hand, each burner 1a-1c is controlled in its air flow rate by a signal transmitted from the air flow rate distribution regulator 16 for the burners and by signals 19a-19c fed back thereto from each multiplier 17a-17c into which signals indicating a fuel flow rate are inputted. At this moment, one of burner dampers 13a-13c is selected as one of largest opening amount by a high selecting arithmetic apparatus 15. |
