| 摘要 |
PURPOSE:To enable to continuously burn main fuel regardless of the change or stop of supplying quantity of auxiliary fuel by a method wherein pressure is set so that the supplying velocity of mixed gas to burners is made faster than its burning velocity by means of a pressure sensing valve control device. CONSTITUTION:Main fuel is supplied to burners 2 at the predetermined flow velocity in order to keep on burning. The set pressure of a pressure sensing valve control device 13 is set so that the supplying flow velocity of the gas mixed auxiliary fuel with nitrogen gas at the burner 2 is made faster than its burning velocity. Next, nitrogen gas is led to a supply line 10 by opening an on-off valve 11. As a result, a control valve 12 open by required degrees of angle by means of the pressure sensing valve control device 13 so as to keep the pressure sensed at a pressure sensing point C at the pressure set at said device 13 and to flow nitrogen gas through said valve 12 into an auxiliary fuel supply line 5. The pressure of mixed gas at the pressure sensing point C is made constant regardless of the change of supplying quantity of auxiliary fuel due to the above- mentioned pressure setting of the pressure sensing valve control device 13 in said fuel supply system.
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