US3844745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-purification system for steel-making plant
Assignee: Gottfried Bischoff Bau Kompl Gasreinigungs und Wasserrueckkehlanlagen GmbH and Co KG
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Filing: 1973-08-08
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Granted: 1974-10-29
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Expires: 1993-08-08
Abstract
Abstract Ducts serving for the exhaustion of dust-laden waste gases from a converter and from ancillary equipment lead to two scrubbing stations whence the purified gases escape through respective chimneys. The effluent from the main scrubbing station, serving the converter, is cleansed in a settling tank for recirculation to both scrubbing stations; the effluent from the secondary scrubbing station is fed to a preliminary stage of the main station through which it also returns to the settling tank. An annular cowl for the interception of peripherally escaping converter gases is connected to a duct normally communicating with the secondary scrubbing station; during charging of the converter, however, this duct is switched to the main scrubbing station which is then not traversed by converter gases.
Inventors
- 👤 G Hausberg
- 👤 K Hegemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:07
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/10; B01D47/06; C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; C21C5/40; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S261/00; Y10S261/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A gas-purification system for a steel-making plant including a converter and ancillary equipment giving rise to dust-laden waste gases, comprising: a main scrubbing station provided with first irrigation means for gases to be purified; a secondary scrubbing station provided with second irrigation means for gases to be purified; first duct means connected to said main scrubbing station and positioned to receive waste gases from said converter during operation thereof; second duct means connected to said secondary scrubbing station and positioned to receive waste gases from said ancillary equipment; third duct means with an inlet positioned in the vicinity of the converter outlet for intercepting gases evolving during charging of the converter and directing the gases so intercepted to said main scrubbing station; and valve means for selectively connecting said third duct means to said secondary scrubbing station.
Claim 2
Dependent Claim
137 words
A gas-purification system for a steel-making plant including a converter and ancillary equipment giving rise to dust-laden waste gases, comprising: a main scrubbing station provided with first irrigation means for gases to be purified; a secondary scrubbing station provided with second irrigation means for gases to be purified; first duct means connected to said main scrubbing station and positioned to receive waste gases from said converter during operation thereof; second duct means connected to said secondary scrubbing station and positioned to receive waste gases from said ancillary equipment; third duct means with an inlet positioned in the vicinity of the converter outlet for intercepting gases evolving during charging of the converter and directing the gases so intercepted to said main scrubbing station; and valve means for selectively connecting said third duct means to said secondary scrubbing station.
Claim 3
Dependent Claim
31 words
A system as defined in claim 1 wherein said first duct means comprises a substantially vertical pipe section above the converter, said inlet forming an annular cowl about said pipe section.
Claim 4
Dependent Claim
76 words
A system as defined in claim 1 wherein said second duct means is provided with a tubular nozzle downstream of said second irrigation means centered on a vertical axis, an insert in said nozzle defining therewith a constricted annular passage for irrigated particle-laden gases, and a separation chamber below said nozzle with an exit port above the level of the lower end of said nozzle for gases freed from at least some of their entrained particles.
Claim 5
Dependent Claim
41 words
A system as defined in claim 1 wherein said second duct means has a plurality of parallel entry branches juxtaposed with different pieces of said ancillary equipment, said entry branches being provided with shutter means for selectively opening and closing same.
Claim 6
Dependent Claim
21 words
A system as defined in claim 1 wherein said first and second irrigation means include a common source of wash water.
Claim 7
Dependent Claim
26 words
A system as defined in claim 5 wherein said source comprises a settling tank connected to receive the effluents of said main and secondary scrubbing stations.
Claim 8
Dependent Claim
48 words
A system as defined in claim 5 wherein said first irrigation means includes a plurality of washing stages in cascade in said first duct means, at least one of said stages being connected to said secondary scrubbing station for circulating the effluent thereof through said main scrubbing station.
Claim 9
Dependent Claim
40 words
A system as defined in claim 7 wherein said first irrigation means comprises a further washing stage in said third duct means and a water separator common to said first and third duct means downstream of all said washing stages.
Claim 10
Dependent Claim
54 words
A system as defined in claim 8 wherein said first and third duct means are each provided with a tubular nozzle between their respective washing stages and said water separator, further comprising an insert in said nozzle defining a constricted annular passage therewith, said insert being operable to block the flow through said passage.
Claim 11
Dependent Claim
78 words
A system as defined in claim 9 wherein at least the nozzle insert of said third duct means is provided with pressure-sensitive control means for blocking the associated annular passage in response to a relatively low preSsure upstream of said nozzle insert, said ancillary scrubbing station being provided with exhaust means generating said relatively low pressure in said third duct means upon operation of said valve means to connect said third duct means to said ancillary scrubbing station.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |