Liquid heaters and vaporizers – Feeders – Automatic
Reexamination Certificate
2004-08-02
2008-08-05
Wilson, Gregory A (Department: 3749)
Liquid heaters and vaporizers
Feeders
Automatic
C122S00100C, C122S406400, C122S409000
Reexamination Certificate
active
07406928
ABSTRACT:
The invention relates to a continuous steam generator provided, in a duct for hot gas circulating in a substantially horizontal direction, with a continuous heating surface of an evaporator comprising a plurality of steam generator tubes which are mounted in parallel for circulating a fluid flow. The inventive device requires exceptionally low construction expenditures and ensures a high degree of safety and a high efficiency. For this purpose, the continuous heating surface of the evaporator is characterized in that it comprises a segment of the heating surface through which a moving fluid flows in an opposite direction with respect to the heated gas direction is positioned in such a way that a saturated steam temperature which is adjusted during operation at the exit from the continuous heating surface deviates from the predetermined maximum value of the temperature of the gas prevailing during operation at the outlet of the segment of the heating surface. In addition, one or several entry collectors are disposed at a close distance from the outlet of the heating surface on the gas side in such a way that the moving fluid has a flow speed in the downpipe which is higher than the minimum speed required for pulling nascent steam bubbles.
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S. Wambeke, “Shortcut Methods for Measuring HRSG Performance”, Power, McGraw-Hill Inc., New York, US. vol. 145, No. 1, Jan. 1, 2001, p. 56-58, XP001001066.
Franke Joachim
Kral Rudolf
Siemens Aktiengesellschaft
Wilson Gregory A
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