US3668825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining the difficulty of removing pollutants by wet scrubbing action
Assignee: National Dust Collector Corp
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Filing: 1969-08-28
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Granted: 1972-06-13
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Expires: 1989-08-28
Abstract
Abstract A method of determining the difficulty of removing pollutants from gas including the steps of passing a sample of the gas through a wet scrubber stage for removing some of the pollutants therefrom, measuring the amount of pollutants remaining in said gas sample after passage through the wet scrubber stage, and adjusting the pressure drop across the scrubber stage to obtain the desired level of pollutants remaining after passage therethrough.
Inventors
- 👤 Robert W Mcilvaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/24; B04C5/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
39 words
The method of claim 1 wherein said wet scrubber stage includes the steps of wetting said gas with liquid, passing said wetted gas through a flow orifice and thereby increasing the velocity, and removing agglomerated pollutants by centrifugal action.
Claim 2
Dependent Claim
37 words
The method of claim 2 wherein said measuring step is accomplished by passing said gas through mechanical filter means and weighing the amount of pollutant collected on said filter means in a selected time period of operation.
Claim 3
Dependent Claim
28 words
The method of claim 3 wherein said pressure adjusting step is accomplished by regulating the flow rate of said liquid introduced into said gas for wetting the same.
Claim 4
Dependent Claim
31 words
The method of any claim 1 including the step of removing at least some of the larger sized pollution constituents from said gas prior to passage into said wet scrubber stage.
Claim 5
Independent Claim
116 words
A method of determining the relative difficulty of removing pollutants from gas by wet scrubbing action including the steps of obtaining a flowing sample of gas from a source thereof, removing pollutants from the flowing sample by passing said gas through a plurality of standard sized wet scrubbers, each scrubber having a flow orifice of selected size and operated at a selected pressure different from the size and pressure, respectively, of the other wet scrubbers, adjusting the operating pressure of each scrubber to a selected level, measuring the amount of pollutant removed by each of said wet scrubbers and comparing said measured amounts of pollutants removed to provide a percentage index between the different operating pressures.
Claim 6
Dependent Claim
34 words
The method of claim 6 wherein said flowing gas sample is passed in series through said wet scrubbers and centrifugal separator means is used for collecting and removing agglomerated pollutants after each wet scrubber.
Claim 7
Dependent Claim
52 words
The method of claim 6 wherein each wet scrubber comprises a successive stage wherein said gas is first wetted and passed through a restrictive orifice plate with a selected pressure drop across said plate and finally agglomerated wetted pollutants in said gas are separated therefrom in a centrifuge and collected for measurement
Claim 8
Dependent Claim
26 words
The method of claim 6 wherein said gas is passed through a dry centrifuge for removing large pollutant particles therefrom before passing through said wet scrubbers.
Claim 9
Dependent Claim
28 words
The method of claim 6 wherein said gas is passed through a stationary porous filter medium for removing any remaining pollutants therein after passage through said wet scrubbers.
Claim 10
Dependent Claim
27 words
The method of claim 7 wherein each successive wet scrubber in said series is operated at higher gas velocity and pressure drop across said flow orifice thereof.
Claim 11
Dependent Claim
29 words
The method of claim 6 wherein scrubbing liquid is introduced into said gas by venturi action before said gas flows through the flow orifice plate of each wet scrubber.
Claim 12
Dependent Claim
30 words
The method of claim 12 wherein said scrubbing liquid is supplied to said venturi at a selectable flow rate thereby controlling the pressure drop across the flow orifice downstream thereof.
Claim 13
Independent Claim
108 words
A method of determining an index representative of the difficulty of removing pollutants from gas by wet scrubbing action comprising the steps of removing pollutants from said gas by passing a sample of gas through a standardized wet scrubber for removing pollutants therefrom, measuring the amount of pollutants in said sample of gas both upstream and downstream of said wet scrubber, adjusting the pressure drop required across said wet scrubber to obtain a particular level of pollutants in said gas downstream of said scrubber for providing said adjusted pressure drop as an index of the difficulty of removing pollutAnts down to said particular level by wet scrubbing action.
Claim 14
Dependent Claim
30 words
The method of claim 14 wherein said wet scrubber includes a flooded disc orifice plate and said gas is passed through a centrifugal separator following passage through said orifice plate.
Claim 15
Dependent Claim
29 words
The method of claim 14 including the step of passing said gas through a centrifugal separator to remove some of the pollutants therefrom before passage through said wet scrubber.
Claim 16
Dependent Claim
104 words
Apparatus for determining the difficulty of removing pollutants from gas by wet scrubbing action comprising means for extracting a sample of polluted gas from a source thereof, wet scrubber means including a flooded disc orifice plate for introducing moisture into said gas during high velocity flow through said orifice plate, means for measuring and adjusting the pressure drop across said orifice plate to establish an index for the gas, centrifugal separator means for removing agglomerated pollutants from said gas after passage through said wet scrubber, and means for measuring the amount of pollutants in said gas after passage through said wet scrubber and separator
Claim 17
Dependent Claim
37 words
The apparatus of claim 17 wherein said wet scrubber means includes venturi means upstream of said orifice plate for introducing moisture into said gas, and means for regulating the flow rate of moisture to said venturi means.
Claim 18
Dependent Claim
24 words
The apparatus of claim 17 including advance centrifugal separator means for removing and collecting pollutants from said gas before passage into said wet scrubber.
Claim 19
Dependent Claim
34 words
The apparatus of claim 17 including second wet scrubber means similar to and downstream of said first mentioned wet scrubber means and including means for measuring the pressure dop across the orifice plate therein.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |