# US 8,540,219 B2 · System and method for preventing scaling in a flue gas desulphurization system

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- Number: US 8,540,219 B2
- Document ID: US8540219B2
- Status: Granted
- Kind: B2
- Application number: 12/046,613
- Filed: 2008-03-12
- Published: 2008-09-18
- Granted: 2013-09-24
- Earliest claimed: 2007-03-16
- Assignees: ALSTOM Technology Ltd
- Applicants: Dennis J. Laslo
- Inventors: Dennis J. Laslo
- Web page: https://patentgrep.com/patent/US8540219B2

## CPC

- B01F 23/23: by introducing gases into liquid media, e.g. for producing aerated liquids
- B01D 53/504: {characterised by a specific device}
- B01F 23/231: by bubbling (mixers with gas or liquid agitation, e.g. with air supply tubes B01F33/40)
- F23J 15/04: using washing fluids {(scrubbers for removing solids only F23J15/022)}
- B08B 5/00: Cleaning by methods involving the use of air flow or gas flow (cleaning hollow articles by methods or apparatus specially adapted thereto B08B9/00)
- B08B 17/00: Methods preventing fouling {(preventing accumulation of deposits in pneumatic conveyors B65G53/521)}
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- 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)
- F23J: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06)
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL

## Abstract

A system & Method for Preventing Scaling in a Flue Gas Desulphurization System is provided. The system includes an injector configured to direct a barrier fluid toward a surface that is otherwise susceptible to scaling when it comes in contact with super-saturated alkaline solutions such as slurry used to capture CO2 from a flue gas stream.

## Claims

### Claim 1

A system for controlling scaling in a flue gas desulphurization system comprising:
an injector in a tank section of an absorber tower configured to direct an alkaline fluid outwardly therefrom against side interior walls of the tank section for alkaline fluid contact with the side interior walls of the tank section; and
an aged alkaline slurry barrier in said tank section on side interior walls formed from alkaline fluid movement of aged alkaline slurry upwardly toward and into contact with said side interior walls reducing scaling thereon.

### Claim 2 (depends on 1)

The system of claim 1 wherein the injector comprises a hollow conduit in which a plurality of apertures is provided.

### Claim 3 (depends on 2)

The system of claim 2 wherein the injector is generally ring-shaped.

### Claim 4 (depends on 3)

The system of claim 3 wherein the injector further comprises spray nozzles fitted to said apertures.

### Claim 5 (depends on 1)

The system of claim 1 wherein the injector comprises a plurality of apertures fitted with nozzles configured so as to direct alkaline fluid into aged alkaline slurry moving the aged alkaline slurry toward and against the side interior walls of the tank section to form the aged alkaline slurry barrier there against.

### Claim 6 (depends on 1)

The system of claim 1 wherein the alkaline fluid comprises a gas.

### Claim 7 (depends on 6)

The system of claim 6 wherein the gas comprises air.

### Claim 8 (depends on 1)

The system of claim 1 wherein the alkaline fluid comprises a non-supersaturated alkaline slurry.

### Claim 9 (depends on 1)

The system of claim 1 wherein the aged alkaline slurry comprises an alkaline slurry not supersaturated with calcium sulfite or calcium sulfate.

### Claim 10 (depends on 9)

The system of claim 9 wherein the aged alkaline slurry is re-circulated from near the bottom of the tank section.