# US 2014/0150652 A1 · Post absorber scrubbing of so3

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- Number: US 2014/0150652 A1
- Document ID: US20140150652A1
- Status: Published application
- Kind: A1
- Application number: 13/690,813
- Filed: 2012-11-30
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: ALSTOM Technology Ltd
- Applicants: Alstom Technology Ltd.
- Inventors: Stephen Alan Bedell
- Web page: https://patentgrep.com/patent/US20140150652A1

## CPC

- B01D 53/1425: {Regeneration of liquid absorbents}
- B01D 53/002: {by condensation}
- B01D 53/1406: {Multiple stage absorption}
- B01D 53/1475: {Removing carbon dioxide}
- B01D 53/1481: {Removing sulfur dioxide or sulfur trioxide}
- B01D 53/58: Ammonia
- B01D 53/78: with gas-liquid contact
- B01D 2252/204: Amines
- B01D 2258/0283: Flue gases
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02C 20/40: of CO2
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A flue gas treatment system includes a CO2 absorber having an inlet for receiving a SO3 aerosol containing gas in the CO2 absorber. An amine solvent is supplied to the CO2 absorber. The CO2 absorber has a high temperature region and a lower temperature region. The high temperature region is configured to create an amine vapor and the lower temperature region is configured to cause the amine vapor to condense on the SO3 aerosol creating SO3/amine droplets. A SO3 aerosol removal device is positioned downstream of the CO2 absorber for removing the SO3/amine droplets from the gas.

## Claims

### Claim 1

A gas treatment system comprising:
a CO2 absorber having an inlet for receiving a SO3 aerosol containing gas in the CO2 absorber, an amine solvent supplied to the CO2 absorber the CO2 absorber having a high temperature region and a lower temperature region, the high temperature region being configured to create an amine vapor and the lower temperature region being configured to cause the amine vapor to condense on the SO3 aerosol creating SO3/amine droplets; and
a SO3 aerosol removal device positioned downstream of the CO2 absorber for removing the SO3/amine droplets from the gas.

### Claim 2 (depends on 1)

The gas treatment system of claim 1, further comprising a water wash system positioned downstream of and in fluid communication, for transport of the gas, with the CO2 absorber, the water wash system being configured to remove the amine vapor from the gas.

### Claim 3 (depends on 2)

The gas treatment system of claim 2, further comprising an acid wash system positioned downstream of and in fluid communication, for transport of the gas, with the water wash system, the acid wash system being configured to remove the ammonia vapor, generated in the CO2 absorber, from the gas.

### Claim 4 (depends on 3)

The gas treatment system of claim 3, wherein the acid wash system is positioned upstream of and is in fluid communication, for transport of the gas, with the SO3 aerosol removal device.

### Claim 5 (depends on 1)

The gas treatment system of claim 1, wherein the gas is a flue gas generated from the combustion of a fuel.

### Claim 6 (depends on 1)

The gas treatment system of claim 1, wherein the SO3 aerosol removal device is a demister.

### Claim 7 (depends on 6)

The gas treatment system of claim 6, wherein the demister is one of a plate and baffle type, a wire mesh type or a Brownian type.

### Claim 8 (depends on 1)

The gas treatment system of claim 1, comprising pre-spray wash system positioned upstream of and in fluid communication, for transport of the gas, with the CO2 absorber, the pre-spray wash system being configured to condense water vapor on the SO3 aerosol.

### Claim 9 (depends on 1)

The gas treatment system of claim 1, wherein particles of the SO3 aerosol have a first diameter and the CO2 absorber system being configured to create the SO3/amine droplets of a second diameter which is greater than 1.5 times the first diameter.

### Claim 10 (depends on 1)

The gas treatment system of claim 1, wherein the amine solvent comprises monoethanolamine.

### Claim 11

A method for treatment of gas comprising:
providing a CO2 absorber/regenerator, with the absorber having a high temperature region and a lower temperature region;
providing a SO3 aerosol removal device positioned downstream of the CO2 absorber;
supplying an amine to the CO2 absorber;
supplying a SO3 aerosol and CO2 containing gas to the absorber;
reacting the CO2 with the amine in the CO2 absorber;
generating an amine vapor in the high temperature region;
condensing the amine vapor on the SO3 aerosol in the low temperature region, thereby creating SO3/amine droplets; and
removing the SO3/amine droplets from the gas in the SO3 aerosol removal device.

### Claim 12 (depends on 11)

The method of claim 11, wherein a water wash system is provided downstream of and in fluid communication, for transport of the gas, with the CO2 absorber;
introducing water to the water wash system; and
removing the amine vapor from the gas in the water wash system.

### Claim 13 (depends on 12)

The method of claim 12, wherein an acid wash system is provided downstream of and in fluid communication, for transport of the gas, with the water wash system;
generating ammonia vapor in the CO2 absorber;
supplying an acid solvent in the acid wash system; and
removing the ammonia vapor from the gas in the acid wash system.

### Claim 14 (depends on 13)

The method of claim 13, wherein the acid wash system is provided upstream of and is in fluid communication, for transport of the gas, with the SO3 aerosol removal device.

### Claim 15 (depends on 11)

The method of claim 11, wherein the gas is a flue gas generated from the combustion of a fuel.

### Claim 16 (depends on 11)

The method of claim 11, wherein the SO3 aerosol removal device is a demister.

### Claim 17 (depends on 16)

The method of claim 16, wherein the demister is one of a plate and baffle type, a wire mesh type or a Brownian type.

### Claim 18 (depends on 11)

The method of claim 11, further comprising:
providing a pre-spray wash system upstream of and in fluid communication, for transport of the gas, with the CO2 absorber;
introducing water in the gas;
vaporizing the water in the pre-spray wash system; and
condensing the water vapor on the SO3 aerosol.

### Claim 19 (depends on 11)

The method of claim 11, wherein particles of the SO3 aerosol have a first diameter and the SO3/amine droplets are of a second diameter which is greater than 1.5 times the first diameter.

### Claim 20 (depends on 11)

The method of claim 11, wherein the amine solvent comprises monoethanolamine.