# US 5,707,410 A · Exhaust stack scrubber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,410 A - Document ID: US5707410A - Status: Granted - Kind: A - Application number: 08/547,188 - Filed: 1995-10-24 - Granted: 1998-01-13 - Earliest claimed: 1995-10-24 - Assignees: Northrup Grumman Corporation - Inventors: Lawrence V. Puls - Web page: https://patentgrep.com/patent/US5707410A ## CPC - B01D 47/06: Spray cleaning - B01D 53/18: Absorbing units; Liquid distributors therefor (B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32) - 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 system for removing contaminants from a gas in an exhaust stack. A cone structure having a plurality of stacked cones is located in the exhaust stack in combination with a spray system including a water input pipe with a misting spray nozzle. Air or gas containing contaminants flows in the exhaust stack. The water from the nozzle system mixes with the air or gas to form a mist. The cones of the cone structure are stacked and held by rods to create slight changes in the flow direction of the mist. The flow of the gases drive the condensed liquid to the outside perimeter of the cones and to the inner wall of the stack or chimney where it is collected in a trough and removed. ## Claims ### Claim 1 Apparatus for removing contaminants from contaminated gas flowing in a wall enclosed vertical exhaust stack structure comprising: a vertical exhaust stack having a vertically rising stream of contaminated gas within the stack, a spray system located in the enclosed vertical exhaust stack for producing a mist of liquid droplets in the exhaust stack wherein the liquid droplets mix with and saturate the contaminated gas flowing in the exhaust stack, wherein the contaminants of the gas are contained in the liquid droplets; a plurality of cones, each comprising conically shaped open mesh material located with the apex of cones pointed down and the open ends of the cones disposed vertically up in the vertical exhaust stack in the path of the liquid droplets mixed with the gas flowing in the exhaust stack for collecting the liquid droplets impinging on the conically shaped mesh material and wherein the gas flows through the openings of the conically shaped mesh material of the plurality of cones wherein the friction of the gas on the droplets cause said liquid droplets impinged on and collected on the conically shaped mesh material to flow up on the surface of said mesh material toward the open ends of the cones and to the walls of the vertical enclosed stack structure wherein the liquid droplets flow down the walls of the exhaust stack. ### Claim 2 (depends on 1) Apparatus for removing contaminants from gas flowing in a wall enclosed vertical exhaust stack structure according to claim 1 wherein the enclosed stack includes a trough located at the walls of the stack below the plurality of cones to collect and remove the liquid droplets flowing down the walls from the plurality of cones. ### Claim 3 (depends on 1) Apparatus for removing contaminants from gas flowing in a wall enclosed vertical exhaust stack structure according to claim 1 wherein said plurality of cones are arranged in a stack and are supported and separated by a plurality of rods disposed in a conical array along the surfaces of the cones. ### Claim 4 (depends on 1) Apparatus for removing contaminants from gas flowing in a wall enclosed vertical exhaust stack structure according to claim 1 wherein the liquid is water. ### Claim 5 (depends on 4) Apparatus for removing contaminants from gas flowing in a wall enclosed vertical exhaust stack structure according to claim 4 wherein an exhaust fan is disposed in the exhaust stack beneath the plurality of cones to propel the liquid droplet and gas mixture upward to the plurality of cones. ### Claim 6 (depends on 5) Apparatus for removing contaminants from gas flowing in a wall enclosed vertical exhaust stack structure according to claim 5 wherein the enclosed vertical exhaust stack includes a trough located at the walls of the stack below the plurality of cones and wherein the walls of the exhaust stack portion including the trough have a larger cross-section dimension than the rest of the exhaust stack, and wherein the plurality of cones are located in the larger cross section portion of the exhaust stack walls, and wherein the trough is located at the bottom of the large cross-section portion of the exhaust stack walls, to collect the liquid droplets flowing down the walls from the plurality of cones. ### Claim 7 (depends on 6) Apparatus for removing contaminants from gas flowing in a wall enclosed vertical exhaust stack structure according to claim 6 wherein the trough includes a drain pipe for conveying the collected liquid droplets from the vertical exhaust stack.