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US3708958A Expired / Lapsed US ⏱️ 0.0 years remaining

Device and method for removing pollutants from stack gases

Assignee: Individual
•
Filing: 1971-07-19
•
Granted: 1973-01-09
•
Expires: 1991-07-19
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Abstract

Abstract Apparatus for removing smoke particles and water soluble combustion gases from stack gases, e.g., of roofing tar heaters and supermarket incinerators, having a body shell in which the stack gas is directed upwardly around at least three vertically aligned and centrally disposed baffle elements, each defining an annular space between the periphery thereof and the body shell, an associated peripheral deflector skirt for each baffle element positioned slightly thereabove and baffling the annular space thereabout and being contiguous to the body shell, a horizontally disposed array of downwardly directed steam nozzles positioned between the associated baffle element and deflector skirt combination above the lowest most baffle element and deflector skirt, and a similar array of water nozzles between the uppermost baffle element and deflector skirt combination, the stack gas exiting from the body shell to a chimney pipe. Each of the peripheral deflector skirts, and each of the baffle elements except the lowest one, are formed of foraminous metal shells such as perforated metal and filled with an activated adsorbent material such as activated anthracite, the lowest most baffle being imperforate. Drains are provided in the floor of the body shell and preferably lead the steam condensate and collected water spray to a filter unit from which water is recycled to the water nozzles. Additional scrubbing capacity is provided by either or both of placing opposed water sprays in the chimney pipe or by utilizing a fourth baffle element and peripheral skirt combination between the water sprayed and steam sprayed combinations, such fourth combination being either steam sprayed or water sprayed as may be required. The method of removing smoke particles and soluble combustion gases from stack gases comprises leading the stack gas through the apparatus described while utilizing little more than sufficient steam in combination with the activated adsorbent to absorb and remove visible smoke particles and enough water to take up the steam but insufficient to interfere seriously with the draft, and collecting the scrubbed materials in the condensed steam and the water and draining them out of the apparatus, preferably to a filter unit from which recycle water is obtained.

Inventors

  • 👤 J Stuit
  • 👤 C Duty
  • 👤 S Stuit

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 07:32
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; Y; Y10; Y10S; Y10S261/00; Y10S261/76

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 71 words
The device as in claim 1 in which each of the body shell, the baffle elements and the peripheral deflector skirts are square in section, the common corners and sides of the elements of each associated group being substantially vertically aligned and each group being substantially aligned, and said drain means being four drain ports in said bottom wall, each drain port being closely adjacent a corner of the body shell.
Claim 2
Dependent Claim 16 words
The device as in claim 2 in which the baffle elements are substantially pyramidal in form.
Claim 3
Dependent Claim 24 words
The device as in claim 1 in which the adsorbent is a material selected from the group consisting of activated anthracite and gamma alumina.
Claim 4
Dependent Claim 53 words
The device as in claim 1 in which the peripheral deflector skirts and all but the lower most baffle elements are hollow and formed of sheet metal having close spaced perforations therethrough of a diameter to retain particulate material in the size range of about 0.125 inch to about 0.375 inch major dimension.
Claim 5
Dependent Claim 16 words
The device as in claim 1 in combination with a combustion device producing polluted stack gas.
Claim 6
Dependent Claim 56 words
The device as in claim 1 together with a filter unit having at least two particulate filter beds connected in series, at least one said bed being filled with particulate activated hot water insoluble inorganic adsorbent, the drain means being adapted to convey liquid from said bottom wall of the body shell to said filter unit.
Claim 7
Dependent Claim 36 words
The device as in claim 7 wherein pump means, control valve means and conduit means are provided for returning filtered liquid from the filter unit to the said at least one remaining upper most nozzle array.
Claim 8
Dependent Claim 26 words
The device as in claim 8 in which the filter unit and the device for removing pollutants are both substantially portable along with a combustion device.
Claim 9
Dependent Claim 25 words
A first device as in claim 1 disposed above and adapted to receive the stack gas exiting from a second device as in claim 1.
Claim 10
Dependent Claim 49 words
The device as in Claim 1 in which the means for conveying stack gas out of the body shell is provided with upper and lower vertically opposed spray means separately controllable in volume whereby stack gas may be further scrubbed with minimal interference with upward flow of stack gas.
Claim 11
Independent Claim 130 words
The method of reducing the gaseous and particulate pollutant content of a stack gas containing the same which comprises: conveying the stack gas into an enclosed treatment scrubber; within said scrubber directing stack gas and steam simultaneously against a foraminous hollow baffles filled with a particulate activated hot water insoluble inorganic adsorbent; concurrently passing stack gas through a curtain of steam spray surrounding said foraminous hollow baffle; then directing so-treated stack gas and aqueous liquid simultaneously against a second foraminous hollow baffle filled with a particulate activated hot water insoluble inorganic adsorbent; concurrently passing stack gas through a curtaIn of aqueous liquid spray surrounding said second foraminous hollow baffle; collecting and removing aqueous liquid and steam condensate from the treatment scrubber; and exiting treated stack gas from the treatment scrubber.
Claim 12
Dependent Claim 29 words
The method as in claim 12 in which the aqueous liquid and steam condensate collected and removed from the treatment scrubber are filtered and re-used as the aqueous liquid.
Claim 13
Dependent Claim 63 words
The method as in claim 12 in which the enclosed treatment scrubber is a rectangular vessel substantially square in section and the aqueous liquid and steam condensate are directly primarily to the sides of the square floor of the vessel as a collection process and the collected liquid exits from a drain in substantially each corner of said floor as the removal process.
Claim 14
Dependent Claim 69 words
The method as in claim 12 in which the volume of steam used within the treatment scrubber is at least sufficient to substantially remove visible smoke from treated stack gas and the volume of aqueous liquid used within the treatment scrubber is sufficient to remove visible steam from treated stack gas but less than that which substantially interferes with the draft of the stack gas through the treatment zone.

References Cited (Backward Citations)

US3327455A Cited
US3456928A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-09 1976-07-10 1977-01-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-09 1980-07-10 1981-01-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-09 1984-07-10 1985-01-09 $7700.00 Window Closed / Lapsed

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