CITY GAS PRESSURE REGULATING DEVICE INCORPORATING ENERGY RECOVERY DEVICE

摘要

PURPOSE: To provide a city gas pressure regulating device which copes with variation in gas demand in a short time, and which can effectively recover energy. ;CONSTITUTION: An expansion turbine 13 and bypass governors 14a, 14b, 14c are provided between an intermediate pressure A line 11 and an intermediate pressure B line 12. Gas at a lowest flow rate FG1 which gives a stable operation flows through at least one bypass governor 14a. When the gas flow rate F1 in the intermediate pressure B line 12 is larger than the sum of FG1 and FSET lowest value, the corresponding quantity of city gas is fed into the expansion turbine 13 as an expansion turbine gas flow rate F2 by means of a flow control device 19. In the expansion turbine 13, energy is recovered as a power when the pressure is decreased from the pressure P1 of the intermediate pressure A line 11 to the pressure p2 of the intermediate pressure B line 12 for rotating a generator 20. Further, the city gas can be heated also at the inlet side of the expansion turbine 13 so as to increase the recovery power, and a low temperature heat can be recovered from the city gas which has been cooled, at the outlet side of the expansion turbine 13.;COPYRIGHT: (C)1995,JPO