Control device of the city gas line energy recovery turbine

摘要

PROBLEM TO BE SOLVED: To hold a pressure in a spot situated downstream from a turbine at a constant value in all cases of the starting period, the operation period, and the stop period of the turbine, to maintain a generation amount at a maximum, and to prevent the occurrence of overload operation of the turbine, in a system to effect recovery of city gas line energy by an expansion turbine. ;SOLUTION: An automatic pressure regulating valve for turbine 2 is located in a gas line 4 on the inlet side of an expansion turbine 1 and a bypass line 5 having an automatic pressure regulation valve for bypass 3 is arranged in a state to intercouple the inlet side of the automatic pressure regulation valve for turbine 2 and the exhaust side of an expansion turbine 1. Pressure.flow regulating means 6, 7, and 8 are provided such that through control of opening and closing of the automatic pressure regulation valve for bypass 3 during the starting and the stop of operation of the expansion turbine 1, a pressure regulation means 6 to hold a pressure in a spot situated downstream from a confluent line of a turbine line and a bypass line at a constant value and the automatic pressure regulating valve for turbine 2 are opened and closed so that, during operation of the expansion turbine 1, a flow rate through a turbine line is adjusted to a value approximately equal to a given value in a range not to exceed the given value, and a pressure in a downstream spot is held at a constant value.;COPYRIGHT: (C)1998,JPO