US3582050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-handling,gas-scrubbing,and blast furnace top pressure control
Assignee: National Steel Corp
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Filing: 1968-09-27
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Granted: 1971-06-01
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Expires: 1988-09-27
Abstract
Abstract Venturi-scrubbing system for blast furnace effluent gases, embodies a fluid handling system in which pressure of fluid (including the effluent gases) flowing in a passageway in open communication with the blast furnace top, is controlled by injecting control fluid into the passageway to increase and decrease the effective transverse cross-sectional area of the passageway at the location of control fluid injection. The control fluid is injected at the throat of the venturi in response to sensed pressure in the passageway, to adjust the effective cross-sectional area of the throat to maintain a predetermined pressure drop across the venturi, or a predetermined pressure upstream or downstream of the venturi. By controlling pressure in the passageway, the blast furnace top pressure is controlled.
Inventors
- 👤 Hiram C Kozak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:36
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/10; Y; Y10; Y10S; Y10S261/00; Y10S261/54; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/206; Y10T137/2065; Y10T137/2071; Y10T137/2076; Y10T137/2273
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
211 words
Gas-scrubbing apparatus, comprising means including walls defining a passageway having a venturi portion and having an effective cross-sectional area for flow of first fluid including gas, means for injecting scrubbing liquid into the passageway at a location upstream of the venturi portion, the passageway walls at the venturi portion including means for accelerating the first fluid to disperse injected scrubbing liquid into fine particles, the venturi portion being characterized by absence of movable walls, sensing means for sensing the pressure of the first fluid flowing in the passageway, means including an injector located at the venturi portion for injecting second fluid into the passageway to decrease and increase the effective cross-sectional area of the passageway at the venturi portion, the injector including directing means for directing the second fluid into the passageway in a direction transverse to the passageway to form a flow-retarding barrier, and control means responsive to the sensing means for increasing and decreasing the pressure of the second fluid to decrease and increase the effective cross-sectional area of the passageway to maintain a predetermined pressure condition of the first fluid flowing in the passageway, the flow-retarding barrier advancing away from and withdrawing toward the walls of the passageway with the increasing and decreasing pressure of the second fluid.
Claim 2
Dependent Claim
73 words
The apparatus of claim 2, the means for injecting second fluid into the passageway to decrease and increase the effective cross-sectional area of the passageway including a supply conduit in fluid communication with the injector, the control means including a pressure regulator in the supply conduit, and controller means responsive to the sensing means for operating the pressure regulator to increase and decrease pressure in the supply conduit downstream of the pressure regulator.
Claim 3
Dependent Claim
31 words
The apparatus of claim 2, the venturi portion having a contraction section, a throat section, and an expansion section, the injector being located at the throat section of the venturi portion.
Claim 4
Dependent Claim
62 words
The apparatus of claim 4, the sensing means including a first pressure sensor located upstream of the throat section of the venturi portion and a second pressure sensor located downstream of the throat section of the venturi portion, the control means increasing and decreasing the pressure of second fluid to maintain a predetermined pressure differential in the passageway across the venturi portion.
Claim 5
Dependent Claim
46 words
The apparatus of claim 4, the sensing means including a pressure sensor located upstream of the throat section of the venturi portion, the control means increasing and decreasing the pressure of second fluid to maintain a predetermined pressure in the passageway upstream of the venturi portion.
Claim 6
Dependent Claim
46 words
The apparatus of claim 4, the sensing means including a pressure sensor located downstream of the throat section of the venturi portion, the control means increasing and decreasing the pressure of second fluid to maintain a predetermined pressure in the passageway downstream of the venturi portion.
Claim 7
Dependent Claim
30 words
The apparatus of claim 4, the directing means including means defining a plurality of injection apertures in the walls of the passageway in the throat section of the venturi portion.
Claim 8
Dependent Claim
26 words
The apparatus of claim 8, the throat section having a central axis, the injection apertures directing second fluid toward the central axis of the throat section.
Claim 9
Dependent Claim
160 words
Gas-scrubbing process, comprising passing first fluid including gas through a passageway having walls and having an effective cross-sectional area for flow of the first fluid, the passageway having a venturi portion characterized by absence of movable walls, injecting scrubbing liquid into the passageway at a location upstream of the venturi portion, accelerating the first fluid in the venturi portion, thereby dispersing injected scrubbing liquid into fine particles, sensing the pressure of the first fluid flowing in the passageway, injecting second fluid into the passageway at the venturi portion in a direction transverse to tHe passageway, thereby forming a flow-retarding barrier, and automatically increasing and decreasing the pressure of the second fluid in response to the sensed first fluid pressure to advance the barrier away from and withdraw the barrier toward the walls of the passageway, thereby decreasing and increasing the effective cross-sectional area of the passageway to maintain a predetermined pressure condition of the first fluid flowing in the passageway.
Claim 10
Dependent Claim
32 words
The process of claim 10, the venturi portion having a contraction section, a throat section and an expansion section, the second fluid being injected into the throat section of the venturi portion.
Claim 11
Dependent Claim
59 words
The process of claim 11, the pressure of first fluid being sensed at a location upstream of the throat section of the venturi portion and at a location downstream of the throat section of the venturi portion, the pressure of second fluid being increased and decreased to maintain a predetermined pressure differential in the passageway across the venturi portion.
Claim 12
Dependent Claim
46 words
The process of claim 11, the pressure of first fluid being sensed at a location upstream of the throat section of the venturi portion, the pressure of second fluid being increased and decreased to maintain a predetermined pressure in the passageway upstream of the venturi portion.
Claim 13
Dependent Claim
46 words
The process of claim 11, the pressure of first fluid being sensed at a location downstream of the throat section of the venturi portion, the pressure of second fluid being increased and decreased to maintain a predetermined pressure in the passageway downstream of the venturi portion.
Claim 14
Dependent Claim
200 words
Blast furnace top pressure control and gas-scrubbing process, comprising withdrawing first fluid including gas from a blast furnace top region, passing the withdrawn first fluid through a passageway in open fluid communication with the blast furnace top region, the passageway having walls and having an effective cross-sectional area for flow of the first fluid, the passageway having a venturi portion characterized by absence of movable walls, injecting scrubbing liquid into the passageway at a location upstream of the venturi portion, accelerating the first fluid in the venturi portion, thereby dispersing injected scrubbing liquid into fine particles, sensing the pressure of the first fluid flowing in the passageway, injecting second fluid into the passageway at the venturi portion in a direction transverse to the passageway, thereby forming a flow-retarding barrier, and automatically increasing and decreasing the pressure of the second fluid in response to the sensed first fluid pressure to advance the barrier away from and withdraw the barrier toward the walls of the passageway, thereby decreasing and increasing the effective cross-sectional area of the passageway to maintain a predetermined pressure condition of the first fluid flowing in the passageway, thereby maintaining a predetermined pressure in the blast furnace top region.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |