Steam generator
AssigneeSiemens Aktiengesellschaft
InventorsEberhard Wittchow, Joachim Franke, Rudolf Kral
Life of this patent
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Abstract
A steam generator which is both suitable for a horizontal mode of construction and offers the advantages of a continuous steam generator. According to the invention, a steam generator has at least one continuous heating surface disposed in a duct where hot gas circulates in a substantially horizontal direction. The heating surface consists of a plurality of parallel and almost vertical pipes which are used to circulate a fluid, and is configured in such a way that the fluid circulating in a tube heated to a greater temperature than the following tube of the same continuous heating surface has a higher flow rate than the fluid circulating in the following tube.
Claims22
A steam generator, comprising:
- an entry collector;
- a discharge collector;
- a heating-gas duct;
- and
- at least one once-through heating area disposed in said heating-gas duct through which a flow is conducted in an approximately horizontal heating-gas direction, said at least one once-through heating area formed from a number of approximately vertically disposed steam-generator tubes connected in parallel for a through flow of a flow medium, said steam-generator tubes configured such that a steam-generator tube of said steam-generator tubes heated to a greater extent compared with a further steam-generator tube of said steam-generator tubes has a higher flow rate of the flow medium compared with said further steam-generator tube, said steam-generator tube and said further steam-generator tube commonly connected to form a first end and a second end, said entry collector connected to said steam-generator tube and said further steam-generator tube at said first end and said discharge collector connected to said steam-generator tube and said further steam-generator tube collector at said second end.
A steam generator, comprising:
- a heating-gas duct;
- and
- at least one once-through heating area disposed in said heating-gas duct through which a flow is conducted in an approximately horizontal heating-gas direction, said at least one once-through heating area formed from a number of approximately vertically disposed steam-generator tubes connected in parallel for a through flow of a flow medium, said steam-generator tubes configured such that a steam-generator tube of said steam-generator tubes heated to a greater extent compared with a further steam-generator tube of said steam-generator tubes has a higher flow rate of the flow medium compared with said further steam-generator tube, said steam-generator tubes of said at least one once-through heating area having on average in each case a ratio of friction pressure loss to geodetic pressure drop at full load of less than 0.4.
A steam generator, comprising:
- a heating-gas duct;
- and
- at least one once-through heating area disposed in said heating-gas duct through which a flow is conducted in an approximately horizontal heating-gas direction, said at least one once-through heating area formed from a number of approximately vertically disposed steam-generator tubes connected in parallel for a through flow of a flow medium, said steam-generator tubes configured such that a steam-generator tube of said steam-generator tubes heated to a greater extent compared with a further steam-generator tube of said steam-generator tubes has a higher flow rate of the flow medium compared with said further steam-generator tube, said steam-generator tubes of said at least one once-through heating area having on average in each case a ratio of friction pressure loss to geodetic pressure drop at full load of less than 0.2.
A steam generator, comprising:
- a heating-gas duct;
- and
- at least one once-through heating area disposed in said heating-gas duct through which a flow is conducted in an approximately horizontal heating-gas direction, said at least one once-through heating area formed from a number of substantially linear and vertically disposed steam-generator tubes connected in parallel for a through flow of a flow medium, said tubes configured such that, in a first and a second steam-generator tube of said tubes of a same once-through heating area, during an increasing heating of said first steam-generator tube, a flow rate of the flow medium increases in said first tube at the cost of a flow rate of the flow medium in said second tube if said second tube is not heated to a greater extent.
Dependencies are inferred from the claim text.