GB631069A - Improvements in thermal power plants - Google Patents

Abstract

631,069. Fluid-pressure servomotor-control systems. AKT.-GES. FUR TECHNISCHE STUDIEN. Oct. 9, 1947, No. 27155. Convention date, Nov. 2, 1946. - [Class 135] [Also in Group XXVI] A gas-turbine plant in which a gaseous working medium describes a closed circuit including at least one compressor and at least one turbine and receives heat in a heater from an intermediate heat convector fluid circulating in an auxiliary circuit containing a nuclear reaction pile, has means for regulating the velocity of circulation of the heat convector fluid so that it is substantially proportional to the quantity of heat to be transmitted to the gaseous working medium. In the gas-turbine plant shown the gaseous working medium flows through a closed circuit including a compressor 1, a heat exchanger 2, a heater 3 in which heat is supplied to the working medium from an external source, a turbine 4 which drives the compressor 1 and a generator 5 and a cooler 71. The heat supplied to the heater 3 is obtained from a nuclear reaction pile 50 through which and the heat exchanger 3, a heat convector fluid is circulated by a blower 52. A decrease in load on the generator 5 causes the governor weights to fly out and turn the lever 9 counterclockwise thus lowering the valve 11. This allows servo fluid to pass into the space above the piston 13 which then moves downwards and through the collar 17 opens the valve 19. At the same time the lever 24 is moved in a counterclockwise direction which causes the collar 26 to open the valve 27 and the lever 49 to switch on the driving motor 45 of the charging compressor 44. Working medium is then extracted from the circuit at the point 38 and flows through pipe 37, valve 27 and pipe 41 into the suction 43 of the compressor 44 from which it is discharged through the pipe 46, valve 19 and pipe 34 into the storage vessel 35. The pressure at the point 59 then falls and the piston 56 is moved to the right by the spring 57. This causes the contact arm 59<SP>1</SP> to move over the variable resistance 60 and thus slow down the motor 61 of the blower 52 which circulates the heat convector fluid. When the load on the generator 5 is increased the valves are so operated that working medium is pumped from the storage vessel 35 into the circuit and the speed of the motor 61 increased. If the output power plant is controlled by means of a byepass pipe around the turbine or by throttling the current of working medium in the main circuit, the velocity at which the heat convector fluid is circulated may be regulated by the difference of inlet and exhaust pressures of the turbine.