| 摘要 |
<p>PURPOSE:To accomplish a stable control of liquid level of an evaporator checking variations in the liquid flowrate at the inlet thereof during the quick load cutting operation by determining a set value of the liquid level thereof for an LPG gas supply plant in thermal generation plants based on the load of the evaporator. CONSTITUTION:A function generator 211 calculates a set value of an LPG liquid level LEVR of an evaporated based on LPG vapor flowrate Fcv3 at the outlet of the evaporator and a deviation LEVE is determined between this value and an LPG liquid level LEV with a subtractor 212. Then, a proportional integrator 213 calculates a signal Fcv1RM for correcting the set value of flowrate at the inlet of the evaporator to which the vapor flowrate Fcv3 is added with an adder 214 to calculate a demand signal Fcv1D for LPG flowrate at the inlet. A subtractor 215 determines a deviation between the demand signal and the liquid flowrate Fcv1 at the inlet to control a regulation valve CV1. This enables stable control of the liquid level during the quick load cutting operation.</p> |
