Waste water incineration method and apparatus for the same

Patent metadata

Field	Value
Publication number	US-11946642-B2
Application number	US-201916970415-A
Country	US
Kind code	B2
Filing date	Dec 23, 2019
Priority date	May 28, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

Provided is a waste water incineration method including (S10) supplying waste water to an evaporator to evaporate the waste water, (S20) supplying an evaporator top discharge stream discharged from the evaporator to an incinerator to incinerate the discharge stream, (S30) mixing a first incinerator discharge stream and a second incinerator discharge stream discharged from the incinerator to form a mixed discharge stream, and (S40) heat-exchanging the mixed discharge stream and a fresh air stream in a first heat exchanger, wherein the mixed discharge stream which has passed through the first heat exchanger is heat-exchanged in a second heat exchanger and discharged to the atmosphere.

First claim

The invention claimed is:

1. A waste water incineration method comprising:
(S 10 ) supplying waste water to an evaporator to evaporate the waste water;
(S 20 ) supplying an evaporator top discharge stream discharged from the evaporator to an incinerator to incinerate the evaporator top discharge stream;
(S 30 ) mixing a first incinerator discharge stream discharged from the incinerator and a second incinerator discharge stream discharged from the incinerator to form a mixed discharge stream; and
(S 40 ) heat-exchanging the mixed discharge stream and a fresh air stream in a first heat exchanger,
wherein the mixed discharge stream which has passed through the first heat exchanger is heat-exchanged in a second heat exchanger and then discharged to the atmosphere, and
wherein a temperature of the first incinerator discharge stream is higher than a temperature of the second incinerator discharge stream.

2. The waste water incineration method of claim 1 , wherein the waste water is heat-exchanged with the mixed discharge stream which has passed through the first heat exchanger in the second heat exchanger.

3. The waste water incineration method of claim 2 , wherein the waste water heat-exchanged in the second heat exchanger is supplied to the evaporator.

4. The waste water incineration method of claim 2 , wherein a temperature of the waste water which has passed through the second heat exchanger is higher than a temperature of waste water before passing through the second heat exchanger.

5. The waste water incineration method of claim 2 , wherein a temperature of the waste water passing through the second heat exchanger is 50° C. to 130° C.

6. The waste water incineration method of claim 1 , wherein the first incinerator discharge stream passes through a third heat exchanger, and then is mixed with the second incinerator discharge stream to form the mixed discharge stream.

7. The waste water incineration method of claim 1 , wherein a temperature of the stream discharged to the atmosphere is 125° C. or less.

8. A waste water incineration apparatus comprising:
an evaporator evaporating waste water and supplying an evaporated top discharge stream to an incinerator;
the incinerator receiving the top discharge stream supplied from the evaporator and incinerating the top discharge stream to supply a first incinerator discharge stream and a second incinerator discharge stream to a third mixer;
the third mixer receiving the first incinerator discharge stream and the second incinerator discharge stream supplied from the incinerator and supplying a mixed discharge stream of the first incinerator discharge stream and the second incinerator discharge stream to a first heat exchanger;
the first heat exchanger heat-exchanging the mixed discharge stream supplied from the third mixer with a supplied fresh air stream; and
a second heat exchanger heat-exchanging the supplied mixed discharge stream passing through the first heat exchanger and discharging the heat-exchanged mixed discharge stream to the atmosphere,
wherein a temperature of the first incinerator discharge stream is higher than a temperature of the second incinerator discharge stream.

9. The waste water incineration apparatus of claim 8 , wherein the waste water and the mixed discharge stream which has passed through the first heat exchanger are heat-exchanged in the second heat exchanger.

10. The waste water incineration apparatus of claim 8 , further comprising:
a third heat exchanger heat-exchanging the first incinerator discharge stream discharged from the incinerator and supplying the heat-exchanged first incinerator discharge stream to the third mixer.

11. The waste water incineration apparatus of claim 8 , wherein
the incinerator is a regeneration thermal oxidizer (RTO).

Assignees

• Lg Chemical Ltd

Inventors

• Kim Tae Woo
• Lee Sung Kyu

Classifications

• F23G7/008 Primary

  for liquid waste (waste oil F23G7/05, waste liquors F23G7/04, sludges F23G7/001) · CPC title

• C02F1/043

  Details · CPC title

• C02F1/048

  Purification of waste water by evaporation · CPC title

• C02F1/74

  with air (aeration of stretches of water C02F7/00) · CPC title

• F23G2200/00

  Waste incineration · CPC title