# US 5,707,426 A · Key advanced linear kinetic absorber method using a particulate arresting device

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- Number: US 5,707,426 A
- Document ID: US5707426A
- Status: Granted
- Kind: A
- Application number: 08/818,557
- Filed: 1997-03-01
- Granted: 1998-01-13
- Earliest claimed: 1996-02-13
- Assignees: The Babcock & Wilcox Company
- Inventors: Daniel S. Kalka; Dennis W. Johnson; Robert B. Myers; Pervaje A. Bhat
- Web page: https://patentgrep.com/patent/US5707426A

## CPC

- B01D 47/06: Spray cleaning
- B01D 47/12: Washers with plural different washing sections (B01D47/14 takes precedence)
- 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)

## Abstract

A method for improved removal of particulates and contaminants from a flue gas produced by the combustion of waste materials or fossil fuels in industrial processes having at least one horizontally oriented heat exchanger stage in which a wet scrubbing solution, such as an alkali reagent is sprayed in the same direction as the flue gas flow and a drain mechanism is located below the horizontally oriented heat exchanger. The horizontal orientation of the heat exchanger and the location of the drain mechanism increase the removal efficiency of very small particulates and contaminants. A collection tank is connected to the drain mechanism. A spray washing system is provided adjacent a mist eliminator and one or more additional heat exchanger stages for unplugging the heat exchanger and enhancing small particulate removal within the system.

## Claims

### Claim 1

A method for removing a fine particulate from a flue gas, the method comprising the steps of:
providing a flue gas to a first stage heat exchanger, the first stage heat exchanger having a first stage upper end and a first stage lower end;
providing a second stage heat exchanger having a second stage entrance and a second stage outlet, and a lower end;
connecting the first stage lower end and the second stage entrance with a transition region conduit in a manner to orient the second stage heat exchanger horizontally;
passing the flue gas to the second stage heat exchanger;
continuously spraying an aqueous spray concurrent with the flow of flue gas in the region of the second stage heat exchanger;
removing a condensate containing particulates and contaminants formed from the flue gas and aqueous spray from the second stage heat exchanger with a drain situated in the lower end of the second stage heat exchanger;
passing the flue gas to a mist eliminator to remove remaining condensate from the flue gas flow; and
passing the cleaned flue gas to an outlet of the mist eliminator.

### Claim 2 (depends on 1)

A method according to claim 1, further comprising spraying a water wash concurrently with the flow of flue gas at one end of the first stage heat exchanger and between the second stage heat exchanger and the mist eliminator.

### Claim 3 (depends on 2)

A method according to claim 2, wherein the water wash is sprayed periodically.

### Claim 4 (depends on 1)

A method according to claim 1, wherein the first stage heat exchanger is oriented horizontally.

### Claim 5 (depends on 1)

A method according to claim 1, wherein the aqueous spray is an alkali reagent spray used to remove acid gases.