US 10,294,137 B2Granted

Apparatus for evaporative concentration of water to be treated, which uses hot lime softening, and method for evaporative concentration of water using the same

AssigneeDoosan Heavy Industries Construction Co., Ltd

InventorsSangmoon Kim, Gunmyung Lee, Weekwan Kang

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Abstract

An apparatus for evaporative concentration of water, containing hardness-causing substances, to be treated using hot lime softening, includes: a first evaporator configured to form first concentrated water from the water to be treated by evaporatively concentrating the water by first heat exchange with hot steam; a hot lime softener configured to precipitate and to separate hardness-causing substances contained in the first concentrated water from at least a portion of the first concentrated water from the first evaporator by reaction with lime and configured to remove the hardness-causing substances from the first concentrated water; and a second evaporator configured to form second concentrated water by further evaporatively concentrating at least a portion of the first concentrated water that passed through the hot lime softener by second heat exchange with hot steam.

Claims20

Dependent claims

An apparatus for evaporative concentration of water, containing hardness-causing substances, to be treated using hot lime softening, the apparatus comprising:

a first evaporator configured to form first concentrated water from the water to be treated by evaporatively concentrating the water by first heat exchange with hot steam, wherein the first evaporator is disposed before a hot lime softener such that the first concentrated water is introduced to the hot lime softener to increase precipitation of hardness-causing substances contained in the first concentrated water without an additional heat source used for satisfying operating temperature condition of the hot lime softener;
the hot lime softener configured to precipitate and separate the hardness-causing substances from at least a portion of the first concentrated water from the first evaporator by reaction with lime and remove the hardness-causing substances from the first concentrated water;
and
a second evaporator configured to form second concentrated water by further evaporatively concentrating at least a portion of the first concentrated water that passed through the hot lime softener by second heat exchange with hot steam.

1 more element

A method for evaporative concentration of water, containing hardness-causing substances, to be treated using hot lime softening, the method comprising:

introducing the water to be treated into a first evaporator in which the introduced water is evaporatively concentrated by heat exchange with hot steam, thereby forming first concentrated water, wherein the process of forming the first concentrated water is performed to increase precipitation of hardness-causing substances contained in the first concentrated water without an additional heat source used for satisfying operating temperature condition for precipitating the hardness-causing substances;
introducing at least a portion of the first concentrated water into a hot lime softener in which the hardness-causing substances are precipitated and separated by reaction with lime, thereby the hardness-causing substances being removed;
and
introducing at least a portion of the first concentrated water, from which the hardness-causing substances were removed, into a second evaporator in which the at least a portion of the first concentrated water, from which the hardness-causing substances were removed, is further evaporatively concentrated by heat exchange with hot steam, thereby forming second concentrated water.

1 more element

Dependencies are inferred from the claim text.