Water Treatment Process for Steam Plant
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsNobuo Ishihara, Sumio Yamauchi, Kazutoyo Murata, Masato Kanedome, Yasuhiko Shoda, Katsuhiko Yamakami
Life of this patent
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Abstract
In a steam plant, scale adhesion to the inside of a specific device is prevented, while reducing the amount of an agent such as hydrazine to the lowest possible level. A temporary change in the chemical environment or an approximately periodic variation in the chemical environment is brought about in a channel (21) inside the prescribed device, during operation of the steam plant.
Claims21
A water treatment process for a steam plant including a steam generator for generating steam by heat from a heat source, a steam turbine driven by the steam from the steam generator, a condenser for condensing the steam exhausted from the steam turbine, a water feeder for feeding the water condensed in the condenser to the steam generator, and a circulation channel for sequentially connecting the steam generator, the steam turbine, the condenser, and the water feeder, wherein
- a change in the chemical environment is temporarily brought about in the channel inside a prescribed device disposed in the channel, during operation of the steam plant.
A water treatment process for a steam plant including a steam generator for generating steam by heat from a heat source, a steam turbine driven by the steam from the steam generator, a condenser for condensing the steam exhausted from the steam turbine, a water feeder for feeding the water condensed in the condenser to the steam generator, and a circulation channel for sequentially connecting the steam generator, the steam turbine, the condenser, and the water feeder, wherein
- a change in the chemical environment is brought about, approximately periodically, in the channel inside a prescribed device disposed in the channel, during operation of the steam plant.
A water treatment process for a steam plant including a steam generator for generating steam by heat from a heat source, a steam turbine driven by the steam from the steam generator, a condenser for condensing the steam exhausted from the steam turbine, a water feeder for feeding the water condensed in the condenser to the steam generator, and a circulation channel for sequentially connecting the steam generator, the steam turbine, the condenser, and the water feeder, wherein
- the water feeder is a centrifugal pump including a volute chamber and an approximately disk-shaped impeller rotatably arranged in the volute chamber and transferring water introduced to the center of the impeller from the outside of the volute chamber to the outside of the volute chamber from the circumference of the impeller by a centrifugal force caused by the rotation of the impeller;
- and
- a change in the chemical environment is brought about in a gap between the impeller surface opposite to the surface at the water-introducing side and the inner surface of the volute chamber, during operation of the centrifugal pump.
Dependencies are inferred from the claim text.