Start-up system for once-through boilers

Details Start-up system for once-through boilers Start-up system for once-through boilers

1983-09-12

1984-12-11

Favors, Edward G.

Liquid heaters and vaporizers

Circulation

With start-up operations

60646, 122406S, 122448S, 122479S, F22D 700

Patent

active

044871660

ABSTRACT:
A start-up system for once-through boilers including the reduction of minimum flow during start-up to 15% full load by the use of multi-lead internal ribbed tubing to the enclosure tubes in the high heat input zones, the use of a variable pressure by-pass stop valve in the main flow path, a pressure reducing means in the by-pass system and two steam spray attemperators from the flash tank or separators. The first steam attemperation is to the outlet of the secondary superheater and the second to the outlet of the reheater.

REFERENCES:
patent: 3255735 (1966-06-01), Pacault et al.
patent: 3304716 (1967-02-01), Griffin et al.
patent: 3362164 (1968-01-01), Rudd
patent: 3789805 (1974-02-01), Williams
patent: 3882680 (1975-05-01), Durrant et al.
patent: 4262636 (1981-04-01), Augsburger
patent: 4344338 (1982-08-01), Stevens

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