Once-through steam generator

Details Once-through steam generator Once-through steam generator

1988-12-08

1990-04-10

Favors, Edward G.

Liquid heaters and vaporizers

Circulation

With start-up operations

122 7R, 122420, 122470, E22D 700

Patent

active

049150626

ABSTRACT:
A once-through steam generator comprises an economizer, an evaporator and a superheater connected in series one below the other in a boiler pass, and are acted upon by a hot gas mass flow flowing in the opposite direction. In order to prevent thermal shock during the introduction of cold feed water when starting the steam generator from a hot state, i.e., with an economizer, evaporator and superheater which are empty and heated to the exhaust gas temperature, a high-temperature starter is connected upstream of the economizer and is arranged above the latter in the boiler pass. The starter acts as a heat buffer so that the economizer, evaporator and superheater are first acted upon by superheated steam and are continuously cooled to their normal operating temperature. The starter is constructed in such a way that its portion which first comes into contact with the cold feed water does not support the steam pressure so that it need only absorb thermal stresses. In normal operation, the starter works as a preheating stage for the economizer.

REFERENCES:
patent: 1263586 (1918-04-01), Meier
patent: 3254631 (1966-06-01), Taylor
patent: 3420054 (1969-01-01), Sheldon
patent: 4501233 (1985-02-01), Kusaka
patent: 4693213 (1987-09-01), Yanai et al.

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