US4852120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling apparatus for electric arc furnace electrodes
Assignee: Nikku Industry Co Ltd
•
Filing: 1988-11-08
•
Granted: 1989-07-25
•
Expires: 2008-11-08
Abstract
Abstract A cooling apparatus for electric arc furnace (EAF) electrodes, in which nozzles spray and cool the surfaces of EAF electrodes outside the furnace roof. The water spray cooling is provided around the graphite electrode columns. Water flow is controlled in a way that water running down the electrode columns is evaporated before entering the EAF-roof hole to enable maximum graphite saving and high security.
Inventors
- 👤 Eigi Udo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:18
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, in which said coolant includes an antioxidant treatment which protects said graphite electrodes.
Claim 2
Independent Claim
56 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, in which said coolant includes an antioxidant treatment which protects said graphite electrodes.
Claim 3
Dependent Claim
23 words
An apparatus in accordance with claim 1, in which said antioxidant is selected from a group consisting of phosphoric acid, nitrogen and argon.
Claim 4
Independent Claim
72 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, in which said cooling agent is sprayed at a flow rate between 1.5 to 5.0 m 2 /hour, and at a pressure between 1.5 and 3.5 kg/cm 3 .
Claim 5
Independent Claim
72 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, in which said cooling agent is sprayed at a flow rate between 1.5 to 5.0 m 2 /hour, and at a pressure between 1.5 and 3.5 kg/cm 3 .
Claim 6
Dependent Claim
44 words
An apparatus in accordance with claim 3, which includes control means for controlling the coolant flow rate in accordance with an operating program based on electrical and operational data of said furnace for optimized use of cooling agent from an economic and safety viewpoint.
Claim 7
Independent Claim
91 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, wherein said means for spraying a cooling agent onto said graphite electrodes includes a spray ring formed of nonmagnetic materials, and said cooling agent is sprayed at a flow rate between 1.5 to 5.0 m 2 /hour, and at a pressure between 1.5 to 3.5 kg/cm 3 .
Claim 8
Independent Claim
91 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, wherein said means for spraying a cooling agent onto said graphite electrodes includes a spray ring formed of nonmagnetic materials, and said cooling agent is sprayed at a flow rate between 1.5 to 5.0 m 2 /hour, and at a pressure between 1.5 to 3.5 kg/cm 3 .
Claim 9
Dependent Claim
39 words
An apparatus in accordance with claim 5, which includes a control means for controlling coolant flow rate in order to assure evaporation of coolant from the surface of said graphite electrodes before entering a critical area in the furnace.
Claim 10
Independent Claim
96 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, wherein said means includes spray nozzles secured to a ring at certain angles which insure that said cooling agent reaches portions of said graphite electrodes, wherein said cooling agent is sprayed at a flow rate between 1.5 to 5.0 m 2 /hour, and at a pressure between 1.5 to 3.5 kg/cm 3 .
Claim 11
Independent Claim
96 words
An apparatus for cooling graphite electrodes extending through a roof of an electric arc furnace (EAF) which comprises means capable of spraying a cooling agent onto an outer surface of a portion of said electrodes extending to an outside of the EAF roof, wherein said means includes spray nozzles secured to a ring at certain angles which insure that said cooling agent reaches portions of said graphite electrodes, wherein said cooling agent is sprayed at a flow rate between 1.5 to 5.0 m 2 /hour, and at a pressure between 1.5 to 3.5 kg/cm 3 .
Claim 12
Dependent Claim
39 words
An apparatus in accordance with claim 7, which includes a control means for controlling coolant flow rate in order to assure evaporation of coolant from the surface of said graphite electrodes before entering a critical area in the furnace.
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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |