US4767258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for charging a shaft furnace
Assignee: Individual
•
Filing: 1986-05-07
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Granted: 1988-08-30
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Expires: 2006-05-07
Abstract
Abstract A process and apparatus for charging a shaft furnace is presented which ensures the vertical and symmetrical fall of charging material from a hopper onto a distribution spout. The discharge valve of the hopper and the valve of a chamber feeding material to the hopper are regulated in such a way as to form a barrage in the base of the hopper. To control the formation of this barrage, and ensure that it will be maintained throughout a charging phase, the hopper and the chamber are weighed separately, signals being produced for the control of dosing valves. In a preferred embodiment of an apparatus for performing this process, the hopper is rotated in order to reduce segregation of the charge material particles.
Inventors
- 👤 Marc Solvi
- 👤 Gilbert Bernard
- 👤 Emile Lonardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:56
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18; C21B7/20; F; F27; F27B; F27B1/00; F27B1/10; F27B1/20; F27D; F27D3/00; F27D3/10; F27D2003/0001; F27D2003/0006; F27D2003/0007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
A process for charging a shaft furnace having a charging installation comprising a rotary or oscillating spout, a hopper with a central discharge pipe above the spout, the discharge aperture of the discharge pipe being controlled by a dosing device operating symmetrically about the central axis of the furnace, the hopper being surmounted by at least one chamber, and a dosing device for regulating the rate of discharge to the hopper from the chamber including the steps of: opening the dosing valve of the chamber in order to bring about the discharge of a sufficient quantity of material for the formation of a barrage of material above the discharge pipe of the hopper with the dosing valve of the hopper being closed until after the formation of said barrage; separately weighting both the hopper and the chamber throughout the duration of the charging; and producing signals which represent, respectively, the contents of the hopper, the contents of the chamber and the sum of the contents of the hopper and the chamber whereby the signals are compared to maintain the barrage of material above the discharge pipe of the hopper until the chamber is completely discharged of material.
Claim 2
Dependent Claim
197 words
A process for charging a shaft furnace having a charging installation comprising a rotary or oscillating spout, a hopper with a central discharge pipe above the spout, the discharge aperture of the discharge pipe being controlled by a dosing device operating symmetrically about the central axis of the furnace, the hopper being surmounted by at least one chamber, and a dosing device for regulating the rate of discharge to the hopper from the chamber including the steps of: opening the dosing valve of the chamber in order to bring about the discharge of a sufficient quantity of material for the formation of a barrage of material above the discharge pipe of the hopper with the dosing valve of the hopper being closed until after the formation of said barrage; separately weighting both the hopper and the chamber throughout the duration of the charging; and producing signals which represent, respectively, the contents of the hopper, the contents of the chamber and the sum of the contents of the hopper and the chamber whereby the signals are compared to maintain the barrage of material above the discharge pipe of the hopper until the chamber is completely discharged of material.
Claim 3
Dependent Claim
41 words
The process of claim 1 including: adjusting the position of the dosing device of the hopper to ensure that the rate of discharge from the hopper does not exceed the rate of flow of material from the chamber to the hopper.
Claim 4
Dependent Claim
42 words
The process of claim 1 including: maintaining the dosing device of the hopper closed until after the flow of material out of the chamber has ceased naturally as a result of the formation of the barrage ascending as far as the chamber.
Claim 5
Dependent Claim
42 words
The process of claim 2 including: maintaining the dosing device of the hopper closed until after the flow of material out of the chamber has ceased naturally as a result of the formation of the barrage ascending as far as the chamber.
Claim 6
Dependent Claim
46 words
The process of claim 1 including: opening the dosing device of the hopper before the natural cessation of the flow of material out of the chamber; and adjusting the position of the dosing device of the hopper wherein the barrage in the hopper will be maintained.
Claim 7
Dependent Claim
46 words
The process of claim 2 including: opening the dosing device of the hopper before the natural cessation of the flow of material out of the chamber; and adjusting the position of the dosing device of the hopper wherein the barrage in the hopper will be maintained.
References Cited (Backward Citations)
FR983066A
Cited
SU96769A1
Cited
US2903144A
Cited
FR2062211A5
Cited
FR2174999A1
Cited
US4071166A
Cited
FR2224370A1
Cited
US4395179A
Cited
DE3007743A1
Cited
GB2106064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |