Method and regenerative separating apparatus for separating contaminants from process exhaust air

Patent metadata

Field	Value
Publication number	US-10682604-B2
Application number	US-201816059839-A
Country	US
Kind code	B2
Filing date	Aug 9, 2018
Priority date	Sep 12, 2014
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

A method for separating impurities from process exhaust air is provided and includes the steps of passing a process exhaust air through a separating device comprising a separation unit, regenerating the separating device by passing a regeneration stream therethrough, where outer lateral surfaces of the separation unit are continuously loaded by the process exhaust air and the regeneration stream, dividing the regeneration stream passing through the separating device during regeneration into a first partial stream having an impurity concentration less than a first predetermined limit, and a second partial stream having an impurity concentration equal to or greater than a second predetermined limit, where the second predetermined limit is equal to or greater than the first predetermined limit, returning the first partial stream generated during regeneration to the separating device and directing the second partial stream generated during regeneration to a cleaning device.

First claim

The invention claimed is:

1. A method for separating impurities from process exhaust air, comprising the steps of:
passing a process exhaust air through a separating device comprising a separation unit configured as a carousel;
regenerating said separating device by passing a regeneration stream therethrough, wherein outer lateral surfaces of said separation unit are continuously loaded by said process exhaust air and said regeneration stream;
dividing said regeneration stream passing through said separating device during regeneration into a first partial stream having an impurity concentration less than a first predetermined limit, and a second partial stream having an impurity concentration equal to or greater than a second predetermined limit, said second predetermined limit being equal to or greater than said first predetermined limit;
returning said first partial stream generated during regeneration to said separating device; and
directing said second partial stream generated during regeneration to a cleaning device.

2. The method according to claim 1 , wherein a flow amount of said first partial stream generated during regeneration is controlled variably.

3. The method of claim 1 , wherein a ratio of the flow amount of said first partial stream generated during regeneration to the flow amount of said second partial stream generated during regeneration is controlled variably.

4. The method according to claim 1 , wherein said first partial stream generated during regeneration is fed into said process exhaust air upstream of said separating device.

5. The method according to claim 1 , wherein said separating device is cooled between the regeneration and the next cleaning of the process exhaust air by means of a cooling air flow, and said first partial stream generated during regeneration is fed into said cooling air flow upstream of said separating device.

6. The method according to claim 1 , wherein a further partial stream is branched off from said second partial stream generated during regeneration and returned to said separating device.

7. The method according to claim 6 , wherein the branched-off further partial stream flow is fed into at least one of said first partial stream, said process exhaust air and said regeneration stream.

8. The method according to claim 1 , wherein said separating device is operated continuously.

9. A regenerative separating device for separating impurities from process exhaust air, comprising:
a port for introducing a process exhaust air;
a separation unit for receiving the impurities from said process exhaust air introduced into said separating device;
a port for discharging clean air;
a port for introducing a regeneration stream;
a divider configured for dividing said regeneration stream passed through said separation unit into a first partial stream having an impurity concentration less than a first predetermined limit, and a second partial stream having an impurity concentration equal to or greater than a second predetermined limit, wherein said second predetermined limit is equal to or greater than said first predetermined limit;
a port for discharging said first partial stream; and
a port for discharging said second partial stream,
wherein said separation unit is configured as a carousel, and wherein outer lateral surfaces of said separation unit are continuously loaded by said process exhaust air and said regeneration stream.

10. The separating device according to claim 9 , wherein said divider is configured to variably control a flow amount of said first partial stream.

11. The separating device according to claim 9 , further comprising a circular or polygonal ring segment-shaped separation zone and a circular or polygonal ring segment-shaped regeneration zone, wherein said separation zone and said regeneration zone do not overlap each other, and said dividing means divides said regeneration zone into a first subzone and a second subzone in a circumferential direction of said carousel-type separation unit.

12. The separating device according to claim 9 , further comprising a port for introducing a cooling air flow and a port for discharging said cooling air flow after passing through said separation unit.

13. A system for separating impurities from process exhaust air, comprising:
a regenerative separating device according to claim 9 ; and
a cleaning device for extracting the impurities from said second partial stream generated during a regeneration process of said separating device.

14. The system according to claim 13 , further comprising a flow line for returning said first partial stream generated during a regeneration process to said separating device.

15. The system according to claim 13 , further comprising a flow controller for branching off a further partial stream from said second partial stream generated during a regeneration process, and at least one flow line for returning said further partial stream to said separating device.

16. The system according to claim 13 , wherein said cleaning device is configured for regenerative thermal oxidation (RTO), direct thermal oxidation (TO), recuperative catalytic oxidation (CO), regenerative catalytic oxidation (RCO), condensation or comprises a gas turbine aggregate having a combustion apparatus for combusting the combustible components of said second partial stream.

Assignees

• Duerr Systems Ag

Inventors

• Herm Enrico
• Rieder Erhard
• Eichhorn Christian

Classifications

• B01D2259/4009

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• B01D2257/708

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  Solvents not covered by groups B01D2257/702 - B01D2257/7027 · CPC title

• B01D2253/108

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