| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel supply device capable of performing dissimilar fuel mixing combustion by a simple structure in a small-scale boiler in which three-step control is performed by a solenoid valve. SOLUTION: A third nozzle for dissimilar fuel and its piping are additionally mounted to the small-scale boiler operated on the basis of three-step control by using two fuel nozzles, that is, a first nozzle and a second nozzle, the fuel equivalent to a low load is jetted from the third nozzle for dissimilar fuel and the second nozzle for main fuel of a small capacity in a low load, and the fuel equivalent to a high load is jetted from all of three fuel nozzles in a high load. Further a connection pipe is disposed in the piping of a main fuel system and a dissimilar fuel system to easily perform an switching operation of main fuel combustion and dissimilar fuel mixing combustion, and a mode changing switch is disposed to operate the solenoid valve to perform three-step control operation by allowing the main fuel to flow to the first nozzle and the third nozzle in the main fuel combustion mode, and allowing the main fuel to flow to the first nozzle and the second nozzle, and allowing the dissimilar fuel to flow to the third nozzle in a dissimilar fuel mixing combustion mode. COPYRIGHT: (C)2008,JPO&INPIT
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