| 摘要 |
PURPOSE:To enable to vary air quantity by conforming the titled controller with a variation even when a thermal value per unit quantity of flow of fuel is varied by use of the thermal value of combustion of multi-fuel combustion boiler as the feed back element of air quantity control. CONSTITUTION:Output of a main steam pressure adjuster 11 is computed through a method, such as feedforward operation by an adder 21 and a differentiator 22, output of the adder 21 is distributed to proportioners 22 and 23, and a signal of a multi-fuel combustion ratio from an operation unit 20 for the multi- fuel combustion ratio based on signals from a main steam flow detetor 16 and a fuel flow detector 4 is applied to the proportiones 22 and 23. Then, outputs from the proportioners 22 and 23 are applied to multipliers 24 and 25 respectively, which are multiplied by outputs of setting units 26 and 27 respectively for respective signals showing necessary air quantity, outputs of the multipliers 24 and 25 are added together by an adder 28 and a signal of the adder 28 is added as a control signal to an air flow regulator 9 which controls necessary quantity of air 3. |
