Cleaning of the water/steam circuit in a once-through forced-flo

Details Cleaning of the water/steam circuit in a once-through forced-flo Cleaning of the water/steam circuit in a once-through forced-flo

1996-11-12

1998-11-24

Morgan, Kriellion S.

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

122379, 165 84, 165 95, B08B 900, F22B 3718, F22B 3748

Patent

active

058401300

ABSTRACT:
In a combined gas/steam power plant with a once-through forced-flow steam generator, a separation bottle (25) is connected between the evaporator (22) and the superheater (23). To clean the water/steam circuit, in the full-load or the part-load mode, a larger quantity of water than necessary is conveyed through the economizer (21) and the evaporator (22) via a feed pump (20). The quantity of water is selected such that wet steam passes into the separation bottle (25). This water fraction, together with all the impurities contained therein, is separated in the separation bottle and is drawn off via a clarifying line (29). Overfeeding can be regulated in such a way that the fresh steam temperature corresponds to the nominal value of the respective load point. When cleaning of the water/steam circuit is intended in the full-load mode, and without overfeeding the system, steam from a stage of incomplete evaporation can be extracted out of the evaporator and led into the separation bottle. During cold starting, the supercooled water passing via the evaporator (22) into the separation bottle (25) and, later, the water separated from the generated wet steam, are discarded via the clarifying line (29) until the desired purity in the water/steam circuit is reached.

REFERENCES:
patent: 4466383 (1984-08-01), Klatt et al.
patent: 4831969 (1989-05-01), Vollhardt et al.
patent: 4836146 (1989-06-01), Russell et al.

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