Patent GB-680072-A (GB)
Title: Improvements relating to gas turbine plants
Filed: 1950-10-10
Abstract: 680,072. Gas turbine plant. SULZER FRERES SOC. ANON. Oct. 10, 1950 [Oct. 18, 1949], No. 24714/50. Class 110 (iii) [Also in Group XXIX] A gas turbine plant comprises two mechanically independent turbines, of which one provides a useful output and the other drives a compressor for compressing the working medium, a heater for heating the compressed medium, an auxiliary turbine coupled to one of the two turbines and driven by working medium tapped off between the compressor and heater, and means for controlling the quantity of working medium supplied to the auxiliary turbine during operation of the plant. Air compressed in a compressor 1, Fig. 1, passes by way of a pipe 3, a heat exchanger 4, a pipe 5, a further heat exchanger 7 and a pipe 8 to a turbine 9 which drives the compressor 1. The exhaust from turbine 9 passes through the tubes 11 of the heat exchanger 4, where it heats the compressed air, and then returns to the inlet of the compressor 1 by way of a cooler 12. Air tapped off from the compressor 1 under the control of a throttle valve 20 passes by way of a pipe 16 and a heat exchanger 18 to a point 19, where it joins air tapped off through a pipe 16<SP>1</SP>, and passes by way of a pipe 21 to a combustion chamber 22. After giving up some of their heat in the tubes 6 of the heat exchanger 7, the combustion products pass in succession through turbines 25 and 30 and give up heat in the tubes 17 of heat exchanger 18, finally exhausting at 32 to atmosphere or to waste gas utilizers. Reheating between the turbines 25 and 30 is provided by a combustion chamber 27. Turbine 30 provides useful output as by driving an adjustable pitch ship's propeller 38 through gearing 37. Turbine 25 drives a compressor 33 which supplies made-up air to the circuit through a pipe 35. To assist the turbine 9 or to absorb an excess of power, a dynamo-electric machine 36 acts, as required, either as a motor or as a generator. It also acts as a starter motor. To regulate the delivery pressure of compressor 33, a servomotor 46 (see Group XXIX) actuates, in accordance with the delivery pressure, a valve 42 controlling the supply of air through a pipe 40 to an auxiliary turbine 39 coupled to the turbine 30. The valve of the delivery pressure can be set by a hand lever 48. To maintain constant the temperature within the pipe 8. the supply of fuel to the burner 23 is regulated by a valve 49 actuated through servomechanism by a temperature-sensitive element 50. The valve of the temperature may be adjustable. In the embodiment shown in Fig. 3. air from the atmosphere is compressed by a compressor 90 and passes through a heat exchanger 92, where it is heated by the exhaust gases, and thence through a pipe 94 to a combustion chamber 95. The combustion products traverse turbines 99 and 101 in parallel. The useful output is provided by a threephase generator 100. A dynamo-electric machine 113 performs the same function as the machine 36 in the previous embodiment. The supply of air to an auxiliary turbine 104 is manually controlled by a valve 107. In a modification, an auxiliary turbine 110, controlled by a valve 112, is provided. A similar modification may be made to the plant shown in Fig. 1. The plant may be of the closedcircuit type.