摘要：
A steam generator 26, especially for a nuclear reactor, comprises a tube-sheet 32 having a plurality of apertures 34A, 34B, a plurality of U-shaped, straight or helical steam generator tubes 36, each steam generator tube 36 having a first end located in one of the apertures 34A in the tube-sheet 32. A blowdown apparatus 50 is arranged adjacent to but spaced from the tubesheet 32. The blowdown apparatus 50 comprising at least one sinuous pipe 52, each sinusoidal pipe 52 is arranged to pass between a plurality of adjacent steam generator tubes 36 and each sinuous pipe 52 extends around a portion of the perimeter of a plurality of U-shaped steam generator tubes 36. Each sinuous pipe 52 has a plurality of longitudinally spaced apertures 54 and each aperture 54 is angled towards the tube-sheet 32 and/or a steam generator tube 36. The blowdown arrangement 50 provides more even removal of crud from the tube-sheet 32.
权利要求：
Claims
1. A steam generator comprising a tube-sheet having a plurality of apertures, a plurality of steam generator tubes, each steam generator tube having a first end located in one of the apertures in the tube-sheet and a blowdown apparatus, the blowdown apparatus being arranged adjacent to but spaced from the tube-sheet, the blowdown apparatus comprising at least one sinuous pipe, each sinuous pipe being arranged to pass between a plurality of adjacent steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each aperture being angled towards the tube-sheet and/or a steam generator tube.
2. The steam generator as claimed in claim 1, comprising a plurality of U- shaped steam generator tubes, each U-shaped steam generator tube having a first end located in one of the apertures in the tube-sheet and a second end located in a further one of the apertures in the tube-sheet, the blowdown apparatus comprising at least one sinuous pipe, each sinuous pipe being arranged to pass between a plurality of adjacent U-shaped steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of U-shaped steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each aperture being angled towards the tube-sheet and/or a U-shaped steam generator tube.
3. The steam generator as claimed in claim 1, comprising a plurality of straight steam generator tubes, each straight steam generator tube having a first end located in one of the apertures in the tube-sheet and a second end located in a respective one of a plurality of apertures in a further tube-sheet, the further tube sheet being arranged above the tube-sheet, the blowdown apparatus comprising at least one sinuous pipe, each sinuous pipe being arranged to pass between a plurality of adjacent straight steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of straight steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced
apertures, each aperture being angled towards the tube-sheet and/or a straight steam generator tube.
4. The steam generator as claimed in claim 1, comprising a plurality of helical steam generator tubes, each helical steam generator tube having a first end located in one of the apertures in the tube-sheet and a second end located in a respective one of a plurality of apertures in a further tube-sheet, the further tube sheet being arranged above the tube-sheet, the blowdown apparatus comprising at least one sinuous pipe, each sinuous pipe being arranged to pass between a plurality of adjacent helical steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of helical steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each aperture being angled towards the tube-sheet and/or a helical steam generator tube.
5. The steam generator as claimed in claim 1, claim 2, claim 3 or claim 4, wherein each sinuous pipe is spaced from the tube-sheet and each sinuous pipe is spaced from the steam generator tubes.
6. The steam generator as claimed in any of claims 1 to 5, wherein the blowdown apparatus comprises a cruciform pipe, an annular pipe and a plurality of sinuous pipes, the annular pipe is connected to the cruciform pipe, each sinuous pipe is connected at one end to the cruciform pipe and is connected at an opposite end to the annular pipe, each sinuous pipe being arranged to pass between a plurality of adjacent steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each apertures being angled towards the tube-sheet and/or a steam generator tube.
f. The steam generator as claimed in any of claims 1 to 5, wherein the blowdown apparatus comprises a cruciform pipe and a plurality of sinuous pipes, each sinuous pipe is connected at one end to a first limb of the cruciform pipe and is connected at an opposite end to a second limb of the cruciform pipe, the
second limb of the cruciform pipe is arranged perpendicularly to the first limb of the cruciform pipe, each sinuous pipe being arranged to pass between a plurality of adjacent steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each apertures being angled towards the tube-sheet and/or a steam generator tube.
8. The steam generator as claimed in any of claims 1 to 5, wherein the blowdown apparatus comprises an annular pipe and a plurality of sinuous pipes, each sinuous pipe is connected at one end to the annular pipe and is connected at an opposite end to the annular pipe, each sinuous pipe being arranged to pass between a plurality of adjacent steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each apertures being angled towards the tube-sheet and/or a steam generator tube.
9. The steam generator as claimed in any of claims 1 to 8, wherein the apertures in the tube-sheet are arranged in rows and columns.
10. The steam generator as claimed in any of claims 1 to 9, wherein the at least one sinuous pipe is oval or ellipsoidal in cross-section.
11. The steam generator as claimed in any of claims 1 to 10, wherein the apertures in the sinuous pipe have different diameters or different cross- sectional areas.
12. The steam generator as claimed in any of claims 1 to 11, wherein the at least one, or each, sinuous pipe is manufactured by additive layer manufacturing.
13. The steam generator as claimed in any of claims 1 to 12, wherein the at least one, or each, sinuous pipe is a serpentine pipe or a sinusoidal pipe.
14. A nuclear reactor arrangement comprising a nuclear reactor and a steam generator comprising a tube-sheet having a plurality of apertures, a plurality of steam generator tubes, each steam generator tube having a first end located in one of the apertures in the tube-sheet and a blowdown apparatus, the blowdown apparatus being arranged adjacent to but spaced from the tube-sheet, the blowdown apparatus comprising at least one sinuous pipe, each sinuous pipe being arranged to pass between a plurality of adjacent steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each aperture being angled towards the tube-sheet and/or a steam generator tube.
15. The nuclear reactor arrangement as claimed in claim 14 comprising a plurality of U-shaped steam generator tubes, each U-shaped steam generator tube having a first end located in one of the apertures in the tube-sheet and a second end located in a further one of the apertures in the tube-sheet, the blowdown apparatus comprising at least one sinuous pipe, each sinuous pipe being arranged to pass between a plurality of adjacent U-shaped steam generator tubes and each sinuous pipe extending around a portion of the perimeter of a plurality of U-shaped steam generator tubes, each sinuous pipe having a plurality of longitudinally spaced apertures, each aperture being angled towards the tube-sheet and/or a U-shaped steam generator tube.