System and method for sulfur recovery

1. A system, comprising:

a desulfurization unit;

a regenerator to receive sulfurized mass from the desulfurization unit;

a sulfur recovery unit;

a sulfur track in fluid communication with the regenerator and the sulfur recovery unit; and

a sulfur concentrator on the sulfur track.

2. The system of claim 1 , wherein the sulfur concentrator comprises a sulfur concentrating membrane.

3. The system of claim 1 , wherein the sulfur concentrator comprises a sulfur oxide concentrator.

4. The system of claim 1 , wherein the sulfur concentrator comprises a hydrogen sulfide concentrator.

5. The system of claim 1 , further comprising a reducing gas track.

6. The system of claim 5 , wherein the reducing gas track is a slip-stream fuel track from the desulfurization unit.

7. The system of claim 6 , further comprising a reductant concentrator on the slip-stream fuel track.

8. The system of claim 7 , wherein the reductant concentrator comprises a reducing gas concentrating membrane.

9. The system of claim 7 , wherein the system further comprises a sweep stream track connected to at least one of the sulfur concentrator and the reductant concentrator.

10. The system of claim 9 , wherein the sweep stream track is a slip-stream track of tail gas from the sulfur recovery unit.

11. The system of claim 1 , wherein the system further comprises an oxidizer on the sulfur track in between the sulfur concentrator and the sulfur recovery unit.

12. A system, comprising:

a desulfurization unit configured to receive a sulfur-laden gas stream and form sulfurized mass;

a regenerator to receive sulfurized mass from the desulfurization unit;

a sulfur recovery unit;

a sulfur track for transporting oxidized sulfur gas from the regenerator to the sulfur recovery unit;

a sulfur oxide concentrating membrane on the sulfur track, comprising a first part to collect concentrated sulfur oxide and a second part to collect residual gas of the sulfur concentrating membrane;

a slip-stream fuel track in fluid communication with the desulfurization unit and the sulfur recovery unit;

a hydrogen concentrating membrane, disposed on the slip-stream fuel track, comprising a first part to collect concentrated hydrogen and a second part to collect residual gas of the hydrogen concentrating membrane;

a sweep steam track connected to the first part of the sulfur oxide concentrating membrane and first part of the hydrogen concentrating membrane; wherein

the sulfur recovery unit is in fluid communication with the first part of the sulfur oxide concentrating membrane and the first part of the hydrogen concentrating membrane.

13. A system, comprising:

a desulfurization unit configured to receive a sulfur-laden gas stream and form sulfurized mass;

a regenerator to receive sulfurized mass from the desulfurization unit;

a sulfur recovery unit;

a sulfur track for transporting reduced sulfur gas from the regenerator to the sulfur recovery unit;

a hydrogen sulfide concentrating membrane on the sulfur track, comprising a first part to collect concentrated hydrogen sulfide and a second part to collect the residual gas from the hydrogen sulfide concentrating membrane;

a first slip-stream sulfur track transporting reduced sulfur gas from the sulfur track to a hydrogen concentrating membrane comprising a first part to collect concentrated hydrogen and a second part to collect residual gas of the hydrogen concentrating membrane;

an oxidizer on a second slip-stream of the sulfur track in fluid communication with the first part of the hydrogen sulfide concentrating membrane, and the sulfur recovery unit;

a sweep steam track connected to the first part of the hydrogen sulfide concentrating membrane and first part of the hydrogen concentrating membrane; wherein

the sulfur recovery unit is in fluid communication with the oxidizer.

14. A process, comprising the steps of:

removing sulfur compounds from a sulfur-laden gas stream using a sorbent in a desulfurization unit to form a sulfurized mass;

desorbing gas from the sulfurized mass in a regenerator to form a sulfur stream;

concentrating a sulfur content of the sulfur stream using a sulfur concentrator to form a concentrated sulfur stream; and

converting the concentrated sulfur stream to form a sulfur product in a sulfur recovery unit.

15. The process of claim 14 , wherein the sulfur concentrator increases the concentration of sulfur oxide in the sulfur stream.

16. The process of claim 14 , wherein the sulfur concentrator increases the concentration of hydrogen sulfide in the sulfur stream.

17. The process of claim 14 , wherein the concentrated sulfur stream is at least partially oxidized and contacted with a reducing gas stream at the sulfur recovery unit to form the sulfur product.

18. The process of claim 17 , wherein the reducing gas stream is sourced from a slip-stream of the desulfurization unit.

19. The process of claim 17 , wherein a reductant concentrator increases reducing gas concentration of the reducing gas stream to form a concentrated reducing gas stream.

20. The process of claim 19 , wherein the reductant concentrator comprises a reducing gas concentrating membrane.

21. The process of claim 17 , wherein a molecular ratio of reducing gas of the reducing gas stream to oxides of sulfur of the concentrated sulfur stream is at least 1.5.

22. The process of claim 14 , further comprising a sweep stream to sweep concentrated gas from at least one of the reductant concentrator and the sulfur concentrator.

23. The process of claim 22 , wherein the sweep stream comprises a portion of a tail gas stream from the sulfur recovery unit.