US4559629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure and means for preheating scrap to be charged into a smelting furnace
Assignee: Danieli and C Officine Meccaniche SpA
•
Filing: 1983-09-12
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Granted: 1985-12-17
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Expires: 2003-09-12
Abstract
Abstract A process for preheating scrap that is to be charged into a smelting furnace using, in part, heat provided by the smelting furnace discharge fumes. The scrap is preheated with clean gas heated by a heat exchanger that exchanges heat between furnace discharge fumes and clean gas. A plant for the preheating process includes a device to gather and convey hot fumes leaving the furnace connected to both the furnace and a heat exchanger, a device to convey cooled fumes from the heat exchanger, a device to convey clean gas connected to the heat exchanger inlet, and a device to convey preheated clean gas from the heat exchanger to at least on skip of scrap.
Inventors
- 👤 Egidio Fedele Dell'Oste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:33
CPC Classifications
F; F27; F27D; F27D13/00; F27D13/002; C; C21; C21C; C21C5/00; C21C5/56; C21C5/562; C21C5/565; F27D17/00; F27D17/30; F27D17/304; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
64 words
A process for preheating scrap to be charged into a smelting furnace with the discharge fumes of the smelting furnace, which is advantageously an arc smelting furnace, characterized by preheating the scrap with clean gas heated through heat exchanger means by discharge fumes taken from the smelting furnace, the clean gas and the discharge fumes being circulated, each of them in its own circuit.
Claim 2
Dependent Claim
64 words
A process for preheating scrap to be charged into a smelting furnace with the discharge fumes of the smelting furnace, which is advantageously an arc smelting furnace, characterized by preheating the scrap with clean gas heated through heat exchanger means by discharge fumes taken from the smelting furnace, the clean gas and the discharge fumes being circulated, each of them in its own circuit.
Claim 3
Dependent Claim
30 words
A process for preheating scrap to be charged as in claim 1, wherein the temperature of the heated clean gas that heats the scrap is controlled with outside chamber means.
Claim 4
Dependent Claim
32 words
A process for preheating scrap to be charged as in claim 1, wherein preheating heated clean gas is conveyed by discharge means to an inlet for fumes in the heat exchanger means.
Claim 5
Dependent Claim
28 words
A process for preheating scrap to be charged as in claim 1, wherein the preheating heated clean gas is conveyed by discharge means to an outlet for fumes.
Claim 6
Dependent Claim
24 words
A process for preheating scrap to be charged as in claim 1, wherein the preheating heated clean gas is conveyed directly to the atmosphere.
Claim 7
Dependent Claim
24 words
A process for preheating scrap to be charged as in claim 1, wherein the preheating heated clean gas is conveyed with a closed circuit.
Claim 8
Dependent Claim
22 words
A process for preheating scrap to be charged as in claim 1 wherein the heated clean gas is air of the atmosphere.
Claim 9
Dependent Claim
25 words
A process for preheating scrap to be charged as in claim 1 wherein that the heated clean gas is a gas drawn from a container.
Claim 10
Dependent Claim
28 words
A process for preheating scrap to be charged as in claim 1 wherein the heated clean gas consists of fumes drawn at the outlet of the scrubber means.
Claim 11
Dependent Claim
25 words
A process for preheating scrap to be charged as in claim 1 wherein at least one skip of scrap is under pressure during the preheating.
Claim 12
Dependent Claim
104 words
Plant for preheating scrap intended to charge a smelting furnace, which is advantageously an arc smelting furnace, comprising in cooperation: means (11) to gather and convey hot fumes leaving the furnace, the gathering and conveying means being connected on the one hand to the furnace and on the other hand to heat exchanger means: means to convey cooled fumes leaving the heat exchanger means: means to convey clean gas which are connected to the inlet of the heat exchanger means: and means which convey the preheating heated clean gas leaving the heat exchanger means and which lead to at least one skip of scrap.
Claim 13
Dependent Claim
104 words
Plant for preheating scrap intended to charge a smelting furnace, which is advantageously an arc smelting furnace, comprising in cooperation: means (11) to gather and convey hot fumes leaving the furnace, the gathering and conveying means being connected on the one hand to the furnace and on the other hand to heat exchanger means: means to convey cooled fumes leaving the heat exchanger means: means to convey clean gas which are connected to the inlet of the heat exchanger means: and means which convey the preheating heated clean gas leaving the heat exchanger means and which lead to at least one skip of scrap.
Claim 14
Dependent Claim
26 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11, wherein the conveyor means take the fumes into a scrubber plant therefor.
Claim 15
Dependent Claim
29 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 or 12, wherein the skip of scrap is connected to means which gather preheating air.
Claim 16
Dependent Claim
35 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 wherein a combustion chamber is located upstream from the skip of scrap on the circuit (19-21) which conveys heated clean gas.
Claim 17
Dependent Claim
34 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 wherein the means which gather preheating clean gas are connected to means conveying fumes upstream from the heat exchanger means.
Claim 18
Dependent Claim
35 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 wherein the means which gather preheating clean gas are connected to means which convey fumes downstream from the heat exchanger means.
Claim 19
Dependent Claim
32 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 wherein the means which gather preheating clean gas after preheating scrap discharge such gas directly into the atmosphere.
Claim 20
Dependent Claim
38 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 wherein the means gathering heated clean gas are connected to the inlet for heated clean gas in at least one successive skip of scrap.
Claim 21
Dependent Claim
26 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 further comprising afterburner means downstream from at least one skip of scrap.
Claim 22
Dependent Claim
37 words
Plant for preheating scrap intended to charge a smelting furnace as in claim 11 wherein the losses of load in the circuit of the fumes are controlled, as there are means which regulate such losses of load.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |