GB642118A - Improvements in power plant - Google Patents

Abstract

642,118. Gas turbine plant. BABCOCK & WILCOX, Ltd., and ZOLLER, R. E. March 21, 1947, No. 7845. [Class 110(iii)] In a gas turbine plant having a furnace fired by a vapour atomizing liquid burner the vapour for the burner is supplied by a vapour generator heated by the turbine exhaust gases. The gas turbine plant shown comprises a high pressure gas turbine 1 driven by gases supplied by a high pressure furnace 2 and a low pressure turbine 5 supplied by a low pressure furnace 4 which re-heats the exhaust gases from the turbine 1. The high pressure furnace 2 is supplied with combustion air by the compressors 6, 7 arranged in series, the low pressure compressor 6 being driven by the turbine 5 and the high pressure compressor 7 by the turbine 1. The combustion air for the high pressure furnace is heated in a heat exchanger 9 by the exhaust gases from the turbine 5. A conduit 10 supplies combustion air to the furnace 4. The furnaces 2, 4 are preferably of the type described in Specification 622,537, [Group XII]. and the burners 12, 13 of the whirlless type described in Specification 579,591, [Group XII]. Oil is supplied to the burners through pipes 14, 15 and steam through the pipes 18, 19 connected through pipes 24, 29 to steam generators 25, 30 heated by the exhaust gases from the low pressure turbine 5. Steam in excess of that required by the burners is passed through pipes 22, 23 and mixed with the furnace gases before they enter the respective turbines. The steam generator 25 is designed to generate steam at a higher pressure than that of the generator 30. The steam pressure in these two generators may be constant above that of the atmosphere or a pressure exceeding by a constant amount the gas pressure within the furnace or the liquid fuel pressure at the burner to which they are respectively connected. The generators 25, 30 are provided with steam and water drums 27, 32 and forced circulation pumps 28, 33. Feed water for the steam generators is heated in an economizer 34. The generating tube banks and economizer may be formed of finned and studded tubes as described in Specification 569,573. [Group XIII]. The valves 35, 36 controlling the amount of steam admixed with the gases may be used to automatically increase the steam pressure in the steam generators with increase of pressure in the furnaces 2, 4. A steam pipe 37 provided with an overflow valve 38 may be arranged to automatically control the pressure in the steam generator 30. Excess steam from the generator 25 may be passed through a connecting pipe 39 to the generator 30. Mechanical or air atomizing oil burners 41 are provided adjacent the generator 25 and are fired during starting up. According to the Provisional Specification, three vapour generators may be provided, the high pressure vapour generator supplies vapour to the burner of the high pressure furnace, the burner of the low pressure furnace may be supplied from the high or medium pressure vapour generator, and the medium and low pressure generators are arranged to supply vapour to the hollow jackets surrounding the combustion spaces of the furnaces as described in Specification 642,117. Specification 512,919, [Group XI], also is referred to.