| 摘要 |
PURPOSE:To improve the controllability and prevent previously the occurrence of a hunting phenomenon or the like by performing temperature compensation in consideration of expansion and contraction of gas in a furnace due to the change of the temperature in the furnace. CONSTITUTION:A fuel flow rate and an air flow rate obtained by a fuel flow rate detector 29 and an air flow rate detector 30 are synthesized by addition in an additive synthesizing part 31 to obtain a gas inflow rate in the furnace. The temperature in the furnace from a furnace temperature detector 32 is operated to extract its square root by a square root extracting operation part 33 and a temperature correction coefficient is obtained, and the gas inflow rate in the furnace is multiplied by the temperature correction coefficient and a feed forward coefficient (k) in a feed forward controlled variable operating means 37 to obtain a feed forward controlled variable. This controlled variable is compensated for disturbance and is taken out through a feed forward model 38 and is added to the output of a furnace pressure regulator 35 to obtain an operation signal. Thus, the controllability is improved and the occurrence of a hunting phenomenon or the like is prevented.
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