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US 9,574,829 B2Granted
System for recovering waste heat
AssigneeSkc Co., Ltd.
InventorsHojin Yang, Kidon Won, Juntae Kim, Doojin Lee, Soo Hyun Park
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Abstract
Provided is a system for recovering waste heat discharged from distillation columns, incinerators, blast columns, smelting columns, and the like at relatively low temperatures to produce hot water in high efficiency, which can be used in various industrial fields. The investment and operating costs of the waste heat recovery system are relatively low as compared with the conventional systems.
Claims3
A multistage system for recovering waste heat, which comprises:
- a first column,
- a first steam reboiler which is fluidly connected to a lower part of said first column for supplying heat to the first column,
- a first hot water generator which is fluidly connected on a secondary side of the first hot water generator to an upper part of said first column for heating cold water to hot water on a primary side of the first hot water generator by a hot fluid discharged from the upper part of said first column,
- a second column,
- a second steam reboiler which is fluidly connected to a lower part of said second column for supplying heat to the second column,
- a first hot water reboiler which is fluidly connected on a primary side of the first hot water reboiler to said first hot water generator and on a secondary side of the first hot water reboiler to the lower part of said second column, wherein the connection between the first hot water reboiler and the second column forms a first fluid loop;
- and wherein the first hot water reboiler receives said hot water of temperature 1 from the first hot water generator and supplies heat from said hot water of temperature 1 to the lower part of said second column via the first fluid loop,
- a third column,
- a third steam reboiler which is fluidly connected to a lower part of said third column for supplying heat to the third column, and
- the second hot water reboiler which is fluidly connected on a primary side of the second hot water reboiler to said first hot water reboiler and on a secondary side of the second hot water reboiler to the lower part of said third column, wherein the connection between the first hot water reboiler and the second column forms a second fluid loop;
- wherein the second hot water reboiler receives said hot water of temperature 2 discharged from said first hot water reboiler after heat is supplied to the second column;
- and wherein the second hot water reboiler supplies heat from said hot water of temperature 2 to the lower part of said third column via the second fluid loop;
- wherein said second column is operated at a temperature higher than the temperature at which said third column is operated;
- and
- wherein the primary side of the hot water generator, the primary side of the first hot water reboiler, and the primary side of the second hot water reboiler are fluidly connected in a third fluid loop.
12 more elements
Dependencies are inferred from the claim text.