Once-through steam generator and a method of configuring a once-

Details Once-through steam generator and a method of configuring a once- Once-through steam generator and a method of configuring a once-

1998-07-27

1999-10-19

Walberg, Teresa

Liquid heaters and vaporizers

Plants

Feed water heaters

122 6A, 1224064, F22B 3712

Patent

active

059670975

ABSTRACT:
The combustion chamber of a once-through steam generator is formed with walls of vertical tubes through which a flow medium flows from the bottom upwards. The tubes have a surface structure on their inner wall surfaces. Particularly favorable mass flow density m is established in the tubes at the load at which critical pressure prevails in the tubes according to the formula: ##EQU1## wherein q.sub.i is a heat flow density on an inner tube wall surface, T.sub.max is a maximum permissible material temperature of the tubes, T.sub.crit is a temperature of the flow medium at the critical pressure, .DELTA.T.sub.W is a temperature difference between the outer and inner wall surfaces of the tubes, and C is a constant.

REFERENCES:
patent: 4987862 (1991-01-01), Wittchow et al.
patent: 5662070 (1997-09-01), Kastner et al.
patent: 5706766 (1998-01-01), Koehler et al.
"Evaporator concepts for Benson-steam generators" (Franke et al.), VGB power plant engineering, vol. 73, No. 4, 1993, pp.352-361.
"New types of boilers manufactured by Mitsubishi for supercritical-and ultra-supercritical-pressure power-generating units" (Semenovker), Thermal Engineering, vol. 41, No. 8, 1994, pp. 655-661.

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