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US 2004/0149239 A1Published application
Steam generator
AssigneeSiemens Aktiengesellschaft
InventorsJoachim Franke, Rudolf Kral
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AssigneeSiemens Aktiengesellschaft
InventorsJoachim Franke, Rudolf Kral
Estimating the term…
The invention relates to a steam generator (1, 1′, 1″), in which a continuous heating surface (8, 10, 12) is located in a fuel gas channel (6) that can be traversed in an approximately horizontal fuel gas direction (x). Said continuous heating surface comprises a number of steam generator pipes (22, 50, 60) that are connected in parallel (W) for the passage of a flow medium and is designed in such a way that a steam generator pipe (22, 50, 60), which is heated to a greater extent than another steam generator pipe (22, 50, 60) of the same continuous hating surface (8, 10, 12), has a higher throughput of the flow medium (W) than the other steam generator pipe (22, 50, 60). The aim of the invention is to produce a low-cost steam generator with a particularly high level of mechanical stability, even when subjected to different thermal stresses. To achieve this, the or each steam generator pipe (22, 50, 60) has a respective downpipe section (34, 52, 62, 64), which is approximately vertical and through which the flow medium (W) can flow downwards and a respective riser pipe section (36, 54, 66, 68) connected downstream of the downpipe on the flow medium side, which is approximately vertical and through which the flow medium (W) can flow upwards.
A steam generator (1, 1′, 1″) in which a once-through heating area (8, 10, 12) is arranged in a heating-gas duct (6) through which flow can occur in an approximately horizontal heating-gas direction (x), which once-through heating area (8, 10, 12) comprises a number of steam generator tubes (22, 50, 60) connected in parallel to the throughflow of a flow medium (W) and which is designed in such a way that a steam generator tube (22, 50, 60) heated to a greater extent compared with a further steam generator tube (22, 50, 60) of the same once-through heating area (8, 10, 12) has a higher rate of flow of the flow medium (W) compared with the further steam generator tube (22, 50, 60), characterized in that one or each steam generator tube (22, 50, 60) in each case comprises an approximately vertically arranged downcomer section (34, 52, 62, 64), through which the flow medium (W) can flow in the downward direction, and an approximately vertically arranged riser section (36, 54, 66, 68) which is connected downstream of said downcomer section (34, 52, 62, 64) on the flow-medium side and through which the flow medium (W) can flow in the upward direction.
Dependencies are inferred from the claim text.