Once-through steam generator having spirally disposed evaporator

Details Once-through steam generator having spirally disposed evaporator Once-through steam generator having spirally disposed evaporator

1998-07-02

1999-11-09

Leo, Leonard

Liquid heaters and vaporizers

Water tube

Wall structure

122 6A, 12223523, 165146, 165169, F22B 3700

Patent

active

059793694

ABSTRACT:
A once-through steam generator includes a gas flue formed of steam generator tubes welded to one another in a gas-tight manner through fins. The steam generator tubes are connected in parallel for the throughflow of a flow medium, they have a surface structure on their inside for generating a high flow turbulence in the medium flowing through them and they are disposed approximately in a spiral coil in a firing region of the gas flue. The steam generator tubes are constructed in such a way that, when they are in operation, the geodetic pressure loss of the medium flowing through them is at least 0.5 times their pressure loss due to friction. This ensures that such a once-through steam generator can also be operated in low load states of, for example, about 20% of the design load, without excessive thermal stresses occurring.

REFERENCES:
patent: 4191133 (1980-03-01), Stevens
patent: 4987862 (1991-01-01), Wittchow et al.
patent: 5662070 (1997-09-01), Kastner et al.
patent: 5701508 (1997-12-01), Kohler et al.
patent: 5706766 (1998-01-01), Koehler et al.
patent: 5735236 (1998-04-01), Kastner et al.
"Modified Correlations for Void and Two-Phase Pressure Drop" (Rhouhani), AB Nuclear Energy Sweden, Mar. 1969.
"Evaporator Concepts for Benson-Steam Generators"(Franke et al.), VGB Power Plant Technology, vol. 73, No. 4, pp. 352-361.

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