Steam generator
AssigneeSiemens Aktiengesellschaft
InventorsWolfgang Kohler, Rudolf Kral, Eberhard Wittchow
Life of this patent
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Abstract
A fossil-fired steam generator includes a gas flue having a surrounding wall being formed by tubes which are mutually joined gas-tightly and which are disposed substantially vertically and can conduct an upward flow through them on the medium side. The tubes in a first or lower part of the gas flue have a greater internal diameter than the tubes in a second part of the gas flue located above. On one hand, this ensures reliable cooling of the tubes. On the other hand, even additional or above-average heating of individual tubes does not lead to inadmissible temperature differences between outlets of the tubes.
Claims11
A fossil-fired steam generator, comprising:
- a gas flue having a bottom and a surrounding wall;
- said surrounding wall having a first part disposed at said bottom of said gas flue and a second part disposed above said first part;
- said surrounding wall being formed of substantially vertical, mutually gas-tightly connected tubes for conducting a flow of a medium;
- said tubes in said first part of said surrounding wall having a greater internal diameter than said tubes in said second part of said surrounding wall;
- a pressure balance vessel disposed outside said gas flue;
- and
- pressure balance tubes each connecting a respective one of said tubes of said surrounding wall to said pressure balance vessel.
Dependencies are inferred from the claim text.