F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
60/45
F01D 1/00 (2006.01) B01D 19/00 (2006.01) F22D 11/00 (2006.01) F28B 9/10 (2006.01)
Patent
CA 1240159
ABSTRACT In a process for purifying and deaerating the feed water line in the circulation system of a power-generating plant heated by nuclear power, the following steps are carried out in order to solve acute problems of steam- generator corrosion: a) when the preheater train is filled, with the steam-generator isolating valve closed, the condensate flows several times via a recirculation line back to the condensate- collecting vessel and to the condensate purification apparatus; b) below the water level in the condensate-collect- ing vessel, a deaerating medium is introduced into the condensate via spray nozzles, rises in the condensate and forms in the deaerating chamber, as result of displacement of the air present in it, a cushion which is conducive to oxygen deaerating; c) the steam produced during deaerating is preci- pitated in an additional condenser which is located in the venting line upstream of the vacuum pump and which is subjected to a secondary cooling water; and d) following the start of steam generation and during the low-load period, subsequent deaerating is carried out by means of steam in the collecting vessel of the condenser. As a result, it is possible to provide purified and deaerated feed water over the entire operating range and to reduce to a minimum the deaerating time before the plant is started.
458958
Brand Andreas
Lang Helmut
Alstom (switzerland) Ag
Bbc Brown Boveri & Company Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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