System and method for reducing emissions in a chemical looping combustion system

Patent metadata

Field	Value
Publication number	US-2016265764-A1
Application number	US-201615061220-A
Country	US
Kind code	A1
Filing date	Mar 4, 2016
Priority date	Mar 12, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

A system for removing impurities from post-combustion gas includes an oxidizer and a reducer operatively connected to the oxidizer, the reducer configured to receive the post-combustion gas. The system further includes a CLOU material capable of selective circulation between the oxidizer and reducer. The CLOU material further oxidizes impurities present in the post-combustion gas to reduce or remove the same.

First claim

What is claimed is:

1 . A system for oxidizing impurities in post-combustion gas comprising:
an oxidizer; a reducer operatively connected to the oxidizer, the reducer configured to receive the post-combustion gas; a CLOU material capable of selective circulation between the oxidizer and reducer; and wherein the CLOU material oxidizes impurities present in the post-combustion gas to remove the same.

2 . The system of claim 1 wherein the reducer receives post-combustion gas from a chemical looping system.

3 . The system of claim 1 wherein the impurities are C, CO, CH4, or H2S.

4 . The system of claim 1 wherein the CLOU material is manganese, copper or cobalt.

5 . The system of claim 1 wherein the CLOU material is a manganese oxide.

6 . The system of claim 1 wherein the CLOU material is present along with a solid oxygen carrier.

7 . The system of claim 1 wherein the reducer is operatively connected to a carbon capture system.

8 . The system of claim 7 wherein the carbon capture system comprises:
a desulfurizer,
a gas condenser; and
a gas processing unit.

9 . A chemical looping system comprising:
a primary chemical looping combustion system that combusts a fuel which produces a resulting gas containing unburned/partially-oxidized impurities; and a post-combustion system for oxidizing the partially-oxidized impurities in the resulting gas, the post-combustion system operatively connected to the primary chemical looping combustion system, the post-combustion system including a reducer and an oxidizer, wherein a CLOU material circulates therebetween, the reducer receiving the resulting gas from the primary chemical looping combustion system to further oxidize the unburned/partially-oxidized impurities in the same.

10 . The system of claim 9 wherein the unburned/partially-oxidized impurities are C, CO, CH4, H2S.

11 . The system of claim 9 wherein the CLOU material is manganese, copper or cobalt.

12 . The system of claim 9 wherein the CLOU material is a manganese oxide.

13 . The system of claim 9 wherein the CLOU material is present along with a solid oxygen carrier.

14 . The system of claim 9 further comprising:
a carbon capture system operatively connected to the reducer of the post-combustion system.

15 . The system of claim 15 wherein the carbon capture system comprises:
a desulfurizer,
a gas condenser; and
a gas processing unit.

16 . A method of oxidizing impurities from a post-combustion gas comprising:
introducing a post-combustion gas to a reducer that is operatively connected to an oxidizer; reacting the post-combustion gas in the reducer with a CLOU material to oxidize the impurities in the post-combustion gas; transferring the CLOU material to the oxidizer and introducing air to oxidize the CLOU material; and transferring the CLOU material back to the reducer to further react with post-combustion gas.

17 . The method of claim 16 wherein the post-combustion gas is received from a chemical looping system.

18 . The method of claim 16 further comprising the step of:
transferring the post-combustion gas after it has been oxidized via the CLOU material to a carbon capture system.

19 . The method of claim 16 wherein the impurities are C, CO, CH4, or H2S.

20 . The method of claim 16 wherein the CLOU material is manganese, copper or cobalt.

21 . The method of claim 16 wherein the CLOU material is a manganese oxide.

22 . The method of claim 16 wherein the CLOU material and a solid oxygen carrier are reacted with the post-combustion gas in the reducer.

23 . A method of capturing CO2 in a post-combustion gas from a chemical looping combustion system for sequestration or reuse, the method comprising:
introducing a post-combustion gas produced by the chemical looping combustion system into a reducer of a post-combustion system, the reducer being operatively connected to an oxidizer of the post-combustion system; reacting the post-combustion gas in the reducer with a CLOU material to oxidize impurities in the post-combustion gas; transferring the post-combustion gas after it has been oxidized via the CLOU material to a CO2 capture system.

24 . The method of claim 23 wherein the impurities are C, CO, CH4, or H2S, or other such species.

25 . The method of claim 23 wherein the CLOU material is manganese, copper or cobalt, or other such material exhibiting CLOU behavior.

26 . The method of claim 23 wherein the CLOU material is a manganese oxide.

27 . The method of claim 23 wherein the CLOU material and a solid oxygen carrier are reacted with the post-combustion gas in the reducer.

Assignees

• Alstom Technology Ltd

Inventors

• Abdulally Iqbal
• Kang Shin Gyoo

Classifications

• Y02C20/20

  of methane · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• C10J2300/1603

  with gas treatment · CPC title

• B01D53/83 Primary

  with moving reactants · CPC title

• C10J2300/1612

  CO2-separation and sequestration, i.e. long time storage · CPC title