US3736888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke and fumes abatement apparatus
Assignee: Individual
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Filing: 1971-07-29
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Granted: 1973-06-05
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Expires: 1991-07-29
Abstract
Abstract Smoke, fumes, and odors are reduced in or eliminated from combustion products from a burn box, incinerator, or furnace by being directed through an exhaust duct to a secondary burner chamber wherein the exhaust products are caused to spiral in one direction along the wall of the secondary burner chamber in a vortex, thence are reversed and directed in the opposite direction through the center of the vortex before being discharged to a scrubber for further treatment or directly to the exhaust stack. Air is added to the primary burning box and to the mentioned exhaust duct in accordance with the temperature of the gases in the duct while the temperature of the secondary burner chamber is controlled, further, in accordance with the temperature of gases emerging therefrom.
Inventors
- 👤 G Lomax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:01
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/50; F23G7/00; F23G7/06; F23G7/061; F23G7/065
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
119 words
The combination in a smoke and fume abatement system including a source of combustion products, an afterburner, an exhaust duct connecting said source and said afterburner, and a discharge pipe leading from said afterburner, of an air passage communicating with said duct, air supply means in said system for causing even flow from said air passage through said secondary burner and said discharge pipe, means for sensing the temperature of combustion products in said duct downstream of said air passage, and an operative connection between said temperature sensing means and said air supply means for controlling the proportions of the air and combustion product mixture in said duct and the temperature and combustibility of the mixture entering said afterburner.
Claim 2
Dependent Claim
119 words
The combination in a smoke and fume abatement system including a source of combustion products, an afterburner, an exhaust duct connecting said source and said afterburner, and a discharge pipe leading from said afterburner, of an air passage communicating with said duct, air supply means in said system for causing even flow from said air passage through said secondary burner and said discharge pipe, means for sensing the temperature of combustion products in said duct downstream of said air passage, and an operative connection between said temperature sensing means and said air supply means for controlling the proportions of the air and combustion product mixture in said duct and the temperature and combustibility of the mixture entering said afterburner.
Claim 3
Dependent Claim
25 words
Smoke abatement apparatus as described in claim 1 in which said air supply means comprises a valve in said air passage and actuating means therefor.
Claim 4
Dependent Claim
69 words
Smoke abatement apparatus as described in claim 1 further including a burner within said afterburner having fuel and air connections, a control valve for at least one of said connections, actuating means for said control valve, means for sensing the temperature of gases in said discharge pipe, and an operative connection between said latter temperature sensing means and said valve actuating means for controlling the temperature of said gases.
Claim 5
Dependent Claim
45 words
Smoke abatement apparatus as described in claim 1 further including a second air passage leading to said source, a valve controlling said second passage and actuating means for said second valve, and an operative connection between said temperature sensing means and said latter aCtuating means.
Claim 6
Dependent Claim
89 words
Smoke abatement apparatus as described in claim 1 further including a burner in said secondary chamber and a wall across the upper part of said chamber, said burner and said duct being directed approximately tangentially and upwardly along the inner wall of said secondary chamber and said discharge pipe emerging from the lower part of said chamber whereby combustion products from said duct and said burner first spiral upwardly in a vortex, then are diverted downwardly through the center of said vortex and thence pass into said discharge pipe.
Claim 7
Dependent Claim
39 words
Smoke abatement apparatus as described in claim 4 in which said operative connections are adapted to modulate said valves between their open and closed positions for close control of the proportions and temperature of the mixture in said duct.
Claim 8
Dependent Claim
53 words
Smoke abatement apparatus as described in claim 4 further including a second air passage leading to said source of combustion products, a third valve controlling said second passage and third valve actuating means for said third valve, and an operative connection between said first mentioned temperature sensing means and said third actuating means.
Claim 9
Dependent Claim
123 words
Smoke abatement apparatus for use in combination with a primary burning chamber, a primary air passage leading thereto, and a discharge stack comprising a secondary burner chamber having communication with said stack and having a burner therein, an exhaust duct connecting said primary and secondary chambers, means for sensing the temperature of combustion products in said duct, a secondary air passage leading to said duct upstream of said temperature sensing means, valves controlling said primary and secondary air passages, motor means modulating said valves and operative connections between said temperature sensing means and said motor means for adjusting the supply of air to said primary chamber and said duct and thereby the temperature of the combustion products in said duct and said stack.
Claim 10
Dependent Claim
123 words
Smoke abatement apparatus for use in combination with a primary burning chamber, a primary air passage leading thereto, and a discharge stack comprising a secondary burner chamber having communication with said stack and having a burner therein, an exhaust duct connecting said primary and secondary chambers, means for sensing the temperature of combustion products in said duct, a secondary air passage leading to said duct upstream of said temperature sensing means, valves controlling said primary and secondary air passages, motor means modulating said valves and operative connections between said temperature sensing means and said motor means for adjusting the supply of air to said primary chamber and said duct and thereby the temperature of the combustion products in said duct and said stack.
Claim 11
Dependent Claim
76 words
Smoke abatement apparatus, as described in claim 8 further including connections for supply of fuel and air to said burner, valve means for controlling at least one of said connections and motor means therefor, means for sensing the temperature of combustion products in said stack communication and an operative connection between said latter temperature sensing means and said latter motor means for assisting in the control of the temperature of the combustion products in said stack.
Claim 12
Dependent Claim
118 words
An afterburner for smoke and fume abatement comprising a chamber having a generally cylindrical side wall, a transverse wall at one end and an outlet at the opposite end thereof, at least one inlet for smoke and fumes leading into an intermediate portion of said chamber, and at least one burner projecting into said chamber between said ends, said duct and said burner being directed generally tangentially of the chamber side wall and toward said transverse wall so as to cause combustion products from said duct and said burner to travel spirally about said cylindrical wall in a vortex and against said transverse wall, thence in a reverse direction toward said outlet through the middle of said vortex.
Claim 13
Dependent Claim
118 words
An afterburner for smoke and fume abatement comprising a chamber having a generally cylindrical side wall, a transverse wall at one end and an outlet at the opposite end thereof, at least one inlet for smoke and fumes leading into an intermediate portion of said chamber, and at least one burner projecting into said chamber between said ends, said duct and said burner being directed generally tangentially of the chamber side wall and toward said transverse wall so as to cause combustion products from said duct and said burner to travel spirally about said cylindrical wall in a vortex and against said transverse wall, thence in a reverse direction toward said outlet through the middle of said vortex.
Claim 14
Independent Claim
97 words
The method of abating smoke and fumes in combustion products which comprises the steps of directing said products through at least one exhaust duct into a generally cylindrical secondary burner chamber, heating said secondary chamber, causing said products to spiral about and along the chamber wall in a vortex, thence reversing the direction of said products at one end of said chamber to cause the same to travel through the middle of said vortex to extend the period of dwell of the products in said chamber, and discharging said products from the opposite end of said chamber.
Claim 15
Independent Claim
97 words
The method of abating smoke and fumes in combustion products which comprises the steps of directing said products through at least one exhaust duct into a generally cylindrical secondary burner chamber, heating said secondary chamber, causing said products to spiral about and along the chamber wall in a vortex, thence reversing the direction of said products at one end of said chamber to cause the same to travel through the middle of said vortex to extend the period of dwell of the products in said chamber, and discharging said products from the opposite end of said chamber.
Claim 16
Dependent Claim
39 words
The method described in claim 11 including the further step of adding air to said duct and controlling the supply of such added air in accordance with the temperature of the mixture of air and products in said duct.
Claim 17
Dependent Claim
28 words
The method described in claim 11 including the further step of controlling the heating of gases in said chamber in accordance with the temperature of gases discharged therefrom.
Claim 18
Dependent Claim
29 words
The method described in claim 12 further including the step of controlling the heating of gases in said chamber in accordance with the temperature of the gases discharged therefrom.
Claim 19
Dependent Claim
42 words
The method described in claim 12 including the further step of adding primary air to said combustion products before entry into said duct and controlling the supply of said primary air in accordance with the temperature of gases in said exhaust duct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |