# US 5,444,029 A · Process for destroying suspended particles

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- Number: US 5,444,029 A
- Document ID: US5444029A
- Status: Granted
- Kind: A
- Application number: 08/351,139
- Filed: 1994-11-30
- Granted: 1995-08-22
- Earliest claimed: 1993-08-10
- Assignees: Omia
- Inventors: Guy Martin
- Web page: https://patentgrep.com/patent/US5444029A

## CPC

- F23G 7/066: {preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator}
- B01D 53/04: with stationary adsorbents {(B01D53/025 takes precedence)}
- B01D 53/0407: {Constructional details of adsorbing systems}
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- B01J 20/3416: {of sorbents or filter aids comprising free carbon, e.g. activated carbon}
- B01J 20/3458: {in the gas phase}
- B01J 20/3483: {by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling}
- B05B 14/49: specially adapted for solvents
- B01D 2253/102: Carbon
- B01D 2259/40001: Methods relating to additional, e.g. intermediate, treatment of process gas
- B01D 2259/4009: using hot gas
- F23G 2204/20: using electric energy
- Y02P 70/10: Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
- Y10S 55/46: Spray booths
- Y10S 502/514: Process applicable either to preparing or to regenerating or to rehabilitating catalyst or sorbent
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method for regenerating an activated charcoal filter for a spray paint booth exhaust which includes the following steps: a passing a first gas flow of uncontaminated inlet air through the filter; preheating the first gas flow; combining the preheated first gas flow with additional uncontaminated air to form a preheated second gas flow at a predetermined temperature for achieving substantially complete desorption of the activated charcoal filter; recirculating the preheated second gas flow through the filter for desorbing filtered contaminants into the second gas flow; conveying the second gas flow to a heat contributing heat exchanging point for further preheating; pyrolytically oxidizing the further reheated gas flow, at a preselected elevated temperature, thereby oxidizing substantially all of the suspended particles therein; passing a resulting oxidized flow, at elevated temperature, to the heat exchanging point for cooling the oxidized gas flow and contributing exchanged heat to the second gas flow to achieve upstream further preheating; and discharging the cooled flow, devoid of noxious particles, to the atmosphere.

## Claims

### Claim 1

A method for regenerating an activated charcoal filter for a spray paint booth exhaust, the method comprising the steps:
passing a first gas flow of inlet air through the filter;
preheating the first gas flow;
combining the preheated first gas flow with additional air to form a preheated second gas flow;
recirculating the preheated second gas flow through the filter for desorbing filtered contaminants into the second gas flow;
diverting a portion of the second gas flow to a heat contributing heat exchanging point for further heating;
pyrolytically oxidizing the further reheated gas flow, thereby oxidizing substantially all of the suspended particles therein;
passing the resulting oxidized flow, at elevated temperature, to the heat exchanging point for cooling the oxidized gas flow and contributing exchanged heat to the second gas flow to achieve heating of second gas flow entering the heat exchanging point; and
discharging the cooled flow, devoid of noxious particles, to the atmosphere.

### Claim 2 (depends on 1)

The regenerating method set forth in claim 1 further comprising the step of providing a common electrical source for the preheating of the first gas flow, the pyrolytic oxidation elevated temperature, and power required for spray painting

### Claim 3 (depends on 1)

The regenerating method set forth in claim 1 wherein the heat exchanging is performed across a baffle path to increase the heat exchanging surface.

### Claim 4 (depends on 1)

The regenerating method set forth in claim 1 wherein the method is performed along a thermally insulated path.

### Claim 5 (depends on 1)

The regenerating method set forth in claim 1 wherein the preheated second gas is at a temperature of 320.degree. C. for achieving substantially complete desorption of the activated charcoal filter.