Liquid heaters and vaporizers – Indirectly heated – Separate fluid
Patent
1991-08-23
1993-05-25
Yuen, Henry C.
Liquid heaters and vaporizers
Indirectly heated
Separate fluid
122407, 122438, 122488, F22B 106
Patent
active
052130657
ABSTRACT:
A steam generator comprises a distribution means, positioned between the shell and the wrapper in the annular downcomer region of the steam generator, for uniformly mixing the colder feedwater with the warmer recirculating water in the downcomer region of the steam generator so that the colder feedwater is not introduced directly into any steam regions of the steam generator and does not contact any pressure boundaries for preventing water hammer and thermal shock to the steam generator. The distribution means has a downwardly directing means for discharging the substantially evenly distributed feedwater from the distribution means into the downcomer region in a descending direction and away from any pressure boundaries for minimizing flow resistance and for preventing thermal shock to the pressure boundaries. The feedwater and the recirculating water are substantially uniformly mixed in the mixing zone of the downcomer region of the steam generator prior to the mixture of feedwater and recirculating water entering the tube bundle or contacting any pressure boundaries, thereby preventing thermal shock and water hammer to the steam generator.
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Chan King W.
Ford Daniel E.
Wilson Robert M.
Addessi A. C.
Westinghouse Electric Corp.
Yuen Henry C.
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