Method of operating a once-through steam generator

Details Method of operating a once-through steam generator Method of operating a once-through steam generator

1988-09-20

1989-09-26

Favors, Edward G.

Liquid heaters and vaporizers

Feeders

Automatic

122406S, 122406ST, F22D 526

Patent

active

048692107

ABSTRACT:
A method of operating a once-through steam generator having a first evaporator heating surface formed of a tube wall of a combustion chamber, and a second evaporator heating surface connected in parallel to the first evaporator heating surface at a water inlet side thereof, the second evaporator heating surface being located in a convection chamber post-connected to the combustion chamber at a flue-gas outlet side thereof downstream from a superheating surface as viewed in a flow direction of flue gas, includes opening a water regulating valve preconnected to the second evaporator heating surface in the flow direction of the feedwater, if a predetermined value of a mass flow of the feedwater into the once-through stem generator is exceeded, so as to initiate a partial mass flow of the feedwater into the second evaporator heating surface; and closing the water regulating valve again, if the predetermined value fails to be attained, so as to terminate the partial mass flow of the feedwater into the second evaporator heating surface.

REFERENCES:
patent: 3220193 (1965-11-01), Strohmeyer, Jr.
patent: 3260246 (1966-07-01), Zwetz
patent: 3434460 (1969-03-01), Schroedter
patent: 3478726 (1969-11-01), Kikimis
patent: 4261301 (1981-04-01), Losel et al.
patent: 4290390 (1981-09-01), Juzi
patent: 4520762 (1985-06-01), Martin
VGB Kraftwerkstechnik 56, Book 12, Dec. 1976, pp. 751-753.

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