| 摘要 |
<p>1387053 Liquid sodium steam generator FOSTER WHEELER CORP 2 March 1972 [2 March 1971] 9876/72 Heading F4A In a liquid sodium steam generator a pressure vessel 12 encloses a plurality of water/steam tube assemblies 40 arranged around a sodium/ water reaction relief pipe 70 and immersed in liquid sodium which enters at 52 and moves between flow shroud 60 and pipe 70 to outlet 58; each tube assembly 40 comprising an inner tube 42 open at both ends which carries water from inlet chamber 32 and an outer tube 44 closed at its lower end which delivers steam to outlet chamber 34. Baffles 66, 68 are arranged alternately, supported by tie rods 80, extending from the pipe 70 and the tube assemblies 40 pass loosely through them; baffles 66 having gaps adjacent flow shroud 60 and baffles 68 having gaps only adjacent the pipe 70, causing sodium to flow across the tube assemblies. The relief pipe 70 is closed at its lower end 81, has a series of burst discs 82 which rupture in the event of a sodium/water reaction and is pressurized with inert gas to prevent inadvertent rupture of the discs. Some sodium becomes trapped between the pressure vessel 12 and the flow shroud 60 to provide a stagnant insulating layer and to prevent this layer from escaping a bellows arrangement 86 extends between the flow shroud and a flange 88 which is urged against seat 90 by spring 92.</p> |
