Patent GB-269196-A (GB)
Title: Method of generating steam and other vapours
IPC: F22B3/00
Filed: 1927-04-08
Abstract: 269,196. La Mont Corporation, (Assignees of La Mont, W. D.). April 10, 1926, [Convention date]. Void [Published under Sect. 91 of the Acts]. Multiple-expansion engines.-Superheated steam is generated and expanded to a lower pressure in an engine and is then subjected to one or more reheats and subsequent expansions, at least part of the reheats being to lower temperatures than the original temperature of the superheated steam and being effected by using at least part of the heating-gases used to generate, superheat, or reheat the steam. Reheats are effected at progressively decreasing temperature and may be preceded by one or more reheats to approximately the same temperature as the original superheat. Steam may be generated in an improved arrangement of the generator described in Specification 171,735, [Class 123 (ii), Steam generators], and the superheating-elements may be similar to the generating elements described in Specifications 171,735 and 252,314, [both in Class 123 (ii), Steam generators]. In the La Mont type of generator shown in Fig. 9, tubes 2, 3 are connected to a lower V-shaped header, and their upper ends are connected to a V- shaped header 7 which is divided into compartments 8, 9, 10. Tubes 4 are connected to compartments 10, and their lower ends to headers 11. Reheater tubes 5 are mounted in V-shaped headers 12, 13. Compartment 8 and headers 6 are connected by a circulating pump 15, and compartments 9 are connected by a pipe 18 which leads steam by a pipe 19 to the high-pressure motor element 20, the exhaust from which passes by a pipe 22, 23 to compartments 10. The headers 11 are connected by a pipe 24 to the intermediate motor element 26 which exhausts by pipe 27 to the header 12. Header 13 leads by pipe 29 to the low-pressure element 30 which exhausts into a condenser 31. In operation, pump 15 discharges water into compartment 8 where it is discharged through nozzles into tubes 2 forming a film on the inside thereof. The unevaporated water flows to the pump 15 and the steam passes up headers 6 and tubes 3 where it is superheated and passes by way of compartments 9 to the element 20. The exhaust passes to compartments 10 and down pipes 4 wherein it is superheated to an intermediate temperature to compartments 11 from whence it passes to the element 26 the exhaust from which is reheated in pipes 5 and then passes to element 30. The high and intermediate elements may be connected together, and a portion of the high-pressure exhaust may be passed directly through element 26 when starting by valve 35. The element 30 may be cut out by valves 28, 37. In reheater 4, there are two lots of tubes, the steam and heating-gases circulate in parallel and counterflow motion. In reheater 5, there is one lot of tubes, and the steam and gases flow in the same direction. In the arrangement of generator, superheater, and reheaters shown in Fig. 10, the first reheat takes place in tubes 45 connected to drums 46, 47 at a temperature approximately that obtained in the superheater tubes 44, and reheats of progressively decreasing temperatures takes place in the tubes 50, 53 of reheaters of the La Mont type. The direction of the heating-gases is indicated by arrows. Steam from tubes 39 is collected in drum 42, and steam from the superheater is connected to element 55. The individual engine elements may be turbines or reciprocating engines. The exit gases may be reduced in temperature to any extent, and with certain fuels may be carried below the dew point and the water present in the combustion gases partially condensed out. The heating-gases may be used in other apparatus between the reheating stages of the plant, and the reheating may be effected in part by hot gases from other sources.