Improvements in and relating to gas turbine cycles with interstage reheating

摘要

412,970. Gas turbine plant. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London, and SAMUELSON, F., 44, Hillmorton Road, Rugby. Jan. 6, 1933, No. 547. [Class 110 (iii).] In a gas turbine plant comprising a multi-stage turbine or two or more turbines, the working gases are reheated between stages by mixing them with gases drawn direct from the combustion chamber. In Fig. 1 a high pressure turbine 13 supplied by a combustion chamber 7 drives a generator 14 and its exciter 15, and a low pressure turbine 17 drives a compressor 1 for the charge air. This air, which may be preheated by the exhaust gases, is passed in part by a damper-controlled port 4 to the combustion chamber 7 in which fuel introduced by a pipe 3 is burnt, and in part by a dampercontrolled port 9 to a chamber 11 surrounding the combustion-chamber at the end 8 of which it mixes with part of the combustion-products and passes by a conduit 12 to the turbine 13. In their passage through the conduit 16 between the turbines 13, 17, the working gases are reheated by combustion products introduced from the chamber 7 by a pipe 18. These products may be fed in by an injector in order to increase the pressure in the pipe, and the supply may be controlled by a damper 19, or by a needle valve, which may be actuated automatically by a thermostat. In a modification, four turbines are arranged in series, two of them driving the power generator, and the other two driving series charge compressors at different speeds. Reheaters are arranged between the turbines as described above. The last turbine discharges into a chimney in order to reduce the back pressure. Fig. 5 shows an arrangement in which the turbine stages are supplied by conduits 31, 35, 39, 43 and in which the injectors 34, 38, 42 for the supply of interstage reheating gases are controlled by interconnected valves 44, 45, 46. The valveoperating cam-shaft 50 is actuated by a thermostat in the gas system, and a manual adjustment 54 is provided for each valve. More than one thermostat may be provided. Interstage combustion chambers for reheating may also be provided.