Method of starting a forced-flow steam generator

Liquid heaters and vaporizers – Circulation – With start-up operations

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Details

122 1B, 122 7R, F22B 3544

Patent

active

042626366

ABSTRACT:
At the start up of the forced-flow steam generator, water is supplied through a line into a radiation-heated superheater heating surface while the by-pass valve connected to the output line of the final superheater is closed. This produces a steam cushion or buffer which initially inhibits the formation of steam in the tube panel (evaporator). Subsequently, the by-pass valve is partly opened to produce a steam flow which cools the superheaters. When the pressure in the steam generator reaches the range of pressures corresponding to the starting pressure of the turbine, feeding of the steam generator with water is started. The heat consumed for starting is therefore reduced.

REFERENCES:
patent: 3021824 (1962-02-01), Profos
patent: 3035557 (1962-05-01), Litwinoff
patent: 3212477 (1965-10-01), Gerber et al.
patent: 3530836 (1970-09-01), Caravatti
patent: 3532453 (1970-10-01), Zipay et al.
patent: 3789804 (1974-02-01), Aguet
patent: 4182274 (1980-01-01), Williams
patent: 4194468 (1980-03-01), Augsburger

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