Method and device for the desulphurisation of a gas flow

Patent metadata

Field	Value
Publication number	US-10556203-B2
Application number	US-201615561732-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	May 12, 2015
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A method and device for the desulphurisation of a hydrogen sulphide-containing gas flow, in particular for combustion in a gas turbine, wherein the gas flow is brought into contact with a washing agent containing a catalytically active component for the absorption of the hydrogen sulphide and forming elementary sulphur, wherein the catalytically active component is reduced in the formation of the elementary sulphur, wherein the washing medium containing the reduced catalytically active component is supplied to a regeneration stage, in which the reduced catalytically active component is converted back via oxidation with an oxygen-containing gas supplied to the regeneration stage, and wherein the oxygen-containing gas is supplied to the regeneration stage from a compressor of a gas turbine. Air from the compressor of a gas turbine is used for purifying a washing medium used for the desulphurisation of a gas flow.

First claim

The invention claimed is:

1. An apparatus for desulfurizing a hydrogen-sulfide-comprising gas stream, comprising:
an absorber including a scrubbing medium comprising a catalytically active component, said absorber configured to absorb hydrogen sulfide from the gas stream to form elemental sulfur by the scrubbing medium comprising the catalytically active component,
a regeneration stage configured to regenerate the catalytically active component reduced during sulfur formation which is fluidically connected to the absorber, and
a gas turbine comprising a compressor, wherein the regeneration stage comprises an input air feed for feeding an oxygen-comprising gas from the compressor, wherein the input air feed is fluidically connected to a discharge conduit of the compressor of the gas turbine;
wherein the absorber is further configured to form gas purified of hydrogen sulfide and wherein the gas turbine is fluidically connected to a discharge conduit of the absorber to supply the gas purified of hydrogen sulfide to the gas turbine.

2. The apparatus as claimed in claim 1 , further comprising:
a metal salt which is employed as the catalytically active component.

3. The apparatus as claimed in claim 1 ,
wherein a ratio of an amount of oxygen supplied to the regeneration stage to an amount of catalytically active component is >1.

4. The apparatus as claimed in claim 1 , further comprising a heat exchanger within the input air feed;
and wherein the heat exchanger within the input air feed is configured to cool the oxygen-comprising gas before entry into the regeneration stage.

5. The apparatus as claimed in claim 1 , further comprising:
a waste air conduit which is fluidically connected to the compressor of the gas turbine and is connected to the regeneration stage, said waste air conduit configured to recycle waste air into the compressor that was formed during regeneration of the catalytically active component inside the regeneration stage.

6. The apparatus as claimed in claim 1 , wherein the same gas turbine that feeds the oxygen-comprising gas from the compressor to the regeneration stage along the input air feed is supplied the gas purified of hydrogen sulfide from the discharge conduit of the absorber.

7. The apparatus as claimed in claim 1 , further comprising:
a feed conduit for the scrubbing medium which is connected to a top of the regeneration stage.

8. The apparatus as claimed in claim 7 ,
wherein the input air feed is connected to a bottom of the regeneration stage such that the oxygen-comprising gas influxes through the regeneration stage in a flow direction counter to a flow direction of the scrubbing medium through the regeneration stage.

9. The apparatus as claimed in claim 1 , further comprising:
a pressure vessel fluidically interposed between the absorber and regeneration stage, said pressure vessel configured to degas the scrubbing medium before the regeneration stage;
a separation unit configured to separate sulfur from the scrubbing medium; and
a withdrawal conduit that connects the pressure vessel and separation unit.

10. The apparatus as claimed in claim 9 , further comprising a treatment apparatus configured to receive filtered scrubbing medium from the separation unit and a recycling conduit which is fluidically connected to the regeneration stage to supply treated scrubbing medium to the regeneration stage.

11. A method for desulfurizing a hydrogen-sulfide-comprising gas stream using the apparatus of claim 1 , the method comprising:
contacting, in the absorber, the gas stream with the scrubbing medium comprising the catalytically active component to absorb the hydrogen sulfide and to form elemental sulfur,
supplying, through a discharge conduit, gas purified of hydrogen sulfide from the absorber to the gas turbine;
burning the gas purified of hydrogen sulfide in the gas turbine,
reducing, in the absorber, the catalytically active component during formation of the elemental sulfur,
supplying the scrubbing medium comprising the reduced catalytically active component from the absorber to the regeneration stage in which the reduced catalytically active component is reformed by oxidation with the oxygen-comprising gas supplied to the regeneration stage, and
supplying the oxygen-comprising gas to the regeneration stage from the compressor of the gas turbine.

12. The method as claimed in claim 11 ,
wherein the scrubbing medium is supplied to the regeneration stage at a top thereof.

13. The method as claimed in claim 11 ,
wherein the oxygen-comprising gas is supplied from the compressor to the regeneration stage at a bottom thereof.

14. The method as claimed in claim 11 ,
wherein a metal salt is employed as the catalytically active component.

15. The method as claimed in claim 11 ,
wherein an amount of the oxygen-comprising gas supplied to the regeneration stage is metered such that a ratio of a supplied amount of oxygen to an amount of the catalytically active component is >1.

16. The method as claimed in claim 11 ,
further comprising cooling the oxygen-comprising gas before entry into the regeneration stage.

17. The method as claimed in claim 11 , wherein the contacting step further comprises forming gas purified of hydrogen sulfide.

18. The method as claimed in claim 11 ,
wherein waste air formed during reformation of the catalytically active component is recycled into the compressor of the gas turbine.

19. The method as claimed in claim 11 ,
wherein the regenerated scrubbing medium is withdrawn from the regeneration stage.

20. The method as claimed in claim 11 ,
wherein the regenerated scrubbing medium comprising the catalytically active component reformed by oxidation is passed from the regeneration stage into the absorber.

Assignees

• Siemens Ag

Inventors

• Joh Ralph
• Schneider Rüdiger
• Vortmeyer Nicolas
• Zimmermann Gerhard

Classifications

• B01D53/965

  including an electrochemical process step · CPC title

• B01D53/1468

  Removing hydrogen sulfide · CPC title

• B01D53/8612

  Hydrogen sulfide · CPC title

• C01B17/05

  by wet processes · CPC title

• Y02E20/16

  Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] · CPC title