Heat exchange – With first fluid holder or collector open to second fluid – Separate external discharge port for each fluid
Patent
1976-12-29
1978-08-15
Myhre, Charles J.
Heat exchange
With first fluid holder or collector open to second fluid
Separate external discharge port for each fluid
122483, 137171, 138 40, 165158, 165176, F28B 902, F28B 908, F28B 1100, F28F 902
Patent
active
041065590
ABSTRACT:
A control device regulating flow rate of a two-phase mixture of steam and water through a vent conduit in fluid communication with the exit from the fourth pass of a four-pass heat exchanger and a low pressure source. The heat exchanger conducts a first fluid vapor through the first and second tube side passes while condensing a portion of the first fluid vapor therein and separating the resulting mixture into condensate and vapor portions at the exit of the second pass. The separated first fluid vapor is then routed through the third and fourth passes where additional condensation of first fluid vapor takes place. A high ratio of first fluid vapor to first fluid condensate is maintained in all four passes to prevent tube failure due to cyclic tube temperatures resulting from alternate flooding and draining of the tubes' interior. The first fluid exiting from the fourth pass is a two-phase mixture of vapor and condensate which must both be vented to a lower pressure source. A control section of conduit of appropriate size is disposed in the vent line to regulate the mixture's flow therethrough and the corresponding first fluid velocity through the four passes of the heat exchanger.
REFERENCES:
patent: 2098671 (1937-11-01), Paget
patent: 2111991 (1938-03-01), Richard
patent: 2589733 (1952-03-01), Rosenblad
patent: 3604502 (1971-09-01), Morse et al.
patent: 3759319 (1973-09-01), Ritland et al.
Rabas Thomas J.
Ritland Paul D.
Keen J. W.
Myhre Charles J.
Richter Sheldon
Westinghouse Electric Corp.
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