Abstract A pressurized-water coolant nuclear reactor steam generator has a vertical housing for the steam generating water and containing an upstanding heat exchanger to which the pressurized-water coolant passes and which is radially surrounded by a guide jacket supporting a water separator on its top. By thermo - siphon action the steam generating water flows upward through and around the heat exchanger within the guide chamber to the latter''s top from which it flows radially outwardly and downwardly through a down draft space formed between the outside of the jacket and the housing. The water separator discharges separated water downwardly. The housing has a feed water inlet opening adjacent to the lower portion of the heat exchanger, providing preheating of the introduced feed water. This preheated feed water is conveyed by a duct upwardly to a location where it mixes with the water discharged from the water separator.
A STREAM GENERATOR INCLUDING A VERTICAL HOUSING HAVING LOWER AND UPPER PORTIONS AND HAVING A FEED-WATER INLET IN SAID LOWER PORTION AND A STEAM OUTLET IN SAID UPPER PORTION AND CONTAINING AN INVENTED U-SHAPED NEST OF HEAT EXCHANGER TUBES FORMING INLET AND OUTLET LEG ENDS, A VERTICAL GUIDE JACKET RADIALLY ENCLOSING SAID NEST AND RADIALLY SPACED INWARDLY FROM SAID HOUSING, A FEED-WATER PREHEATED CHAMBER RADIALLY ENCLOSING SAID OUTLET LEG END AND CONNECTED WITH SAID FEED-WATER INLET, AND A WATER SEPARATOR POSITIONED ABOVE SAID JACKET BELOW SAID STEAM OUTLET AND DOWNWARDLY DISCHARGING SEPARATED WATER; WHEREIN THE IMPROVEMENT COMPRISES A DUCT CONNECTED WITH SAID PREHEATER TO RECEIVE PREHEATED FEED-WATER THEREFROM AND EXTENDING TO ADJACENTLY BELOW SAID WATER SEPARATOR AT A LOCATION FEEDING THE PREHEATED FEED WATER DIRECTLY INTO SEPARATED WATER DISCHARGED BY SAID WATER SEPARATOR.
Claim 2
Dependent Claim
133 words
A STREAM GENERATOR INCLUDING A VERTICAL HOUSING HAVING LOWER AND UPPER PORTIONS AND HAVING A FEED-WATER INLET IN SAID LOWER PORTION AND A STEAM OUTLET IN SAID UPPER PORTION AND CONTAINING AN INVENTED U-SHAPED NEST OF HEAT EXCHANGER TUBES FORMING INLET AND OUTLET LEG ENDS, A VERTICAL GUIDE JACKET RADIALLY ENCLOSING SAID NEST AND RADIALLY SPACED INWARDLY FROM SAID HOUSING, A FEED-WATER PREHEATED CHAMBER RADIALLY ENCLOSING SAID OUTLET LEG END AND CONNECTED WITH SAID FEED-WATER INLET, AND A WATER SEPARATOR POSITIONED ABOVE SAID JACKET BELOW SAID STEAM OUTLET AND DOWNWARDLY DISCHARGING SEPARATED WATER; WHEREIN THE IMPROVEMENT COMPRISES A DUCT CONNECTED WITH SAID PREHEATER TO RECEIVE PREHEATED FEED-WATER THEREFROM AND EXTENDING TO ADJACENTLY BELOW SAID WATER SEPARATOR AT A LOCATION FEEDING THE PREHEATED FEED WATER DIRECTLY INTO SEPARATED WATER DISCHARGED BY SAID WATER SEPARATOR.
Claim 3
Dependent Claim
55 words
The steam generator of claim 1 in which said preheater chamber is formed at least in part by walls of light construction as compared to that of said housing, said chamber having at least one outlet valve of the pressure-responsive type which opens in response to the pressure differential between said chamber and said housing.
Claim 4
Dependent Claim
19 words
The steam generator of claim 1 having means for introducing additional feed water to said housing''s said upper portion.
Claim 5
Dependent Claim
35 words
The steam generator of claim 1 in which said preheater chamber has an opening into said guide jacket and a flow-distributing plate having interspaced openings extending across the inside of said jacket above said opening.