| 摘要 |
1,053,515. Forced flow steam boilers. SIEMENS-SCHUCKERTWERKE A.G. March 23, 1964 [March 23, 1963], No. 12262/64. Heading F4A. A steam boiler and turbine installation having a starting vessel 8, Fig. 1 (not shown), containing the last stage of a multistage feedwater preheating system, comprises a forced flow boiler 9, a superheater 10, a valve 16, high and low pressure turbines 12, 2, a reheater 13, feedwater control valve 21, measuring device 22 and the first two feedwater preheating stages 6, 7. The vessel 8 is connected to the superheater outlet via a HP reducing valve 17 and to the HP turbine outlet via conduit 14. Exhaust from the LP turbine passes to a condenser 1 from which condensate is pumped to a feedwater container 4. Steam condensed in the vessel 8 drains to stage 7 through valve 26 which opens when the level in vessel 8 reaches a predetermined level. However, during starting water drains directly to container 4 through valve 24 when the level reaches a second predetermined level greater than the first, except if the pressure in container 4 exceeds that in stage 8 or there is excess salt content in the water which then drains to waste through valve 25. For starting, valve 16 is closed and valve 17 opened, steam cooled by injecting water through pipe 18 then passes into the vessel 8. Dry steam is separated out and supplied to the reheater 13, water draining to container 4. The vessel 8 of cylindrical form has the valve 17 axially mounted at the top, Figs. 2-4, and conduit 14 entering radially permitting steam to flow over the plates 27, 28 to separate water. Feedwater is heated in a serpentine parallel pipe system 32 extending between inlet and outlet headers 31, 33. The vessel may be horizontal, Fig. 6, with the separating plates assembly mounted externally of the vessel. The steam may be directed tangentially into the assembly and the walls of the vessel may have cooling tubes adjacent this assembly. |
