JPS5741328A - Operating method for base fan of box type coil annealing furnace - Google Patents
Operating method for base fan of box type coil annealing furnaceInfo
- Publication number
- JPS5741328A JPS5741328A JP11469780A JP11469780A JPS5741328A JP S5741328 A JPS5741328 A JP S5741328A JP 11469780 A JP11469780 A JP 11469780A JP 11469780 A JP11469780 A JP 11469780A JP S5741328 A JPS5741328 A JP S5741328A
- Authority
- JP
- Japan
- Prior art keywords
- base fan
- period
- revolutions
- heat transfer
- temp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
PURPOSE:To save electric power considerably by fully operating a base fan in a heating period and a natural cooling period and decreasing the number of revolutions of the base fan within the range of not lowering the overall heat transfer coefft. in a furnace in a soaking period and a force cooling period. CONSTITUTION:The quantity of heat transfer from a furnace to the center of a coil in a heating period and a soaking period is as per the equation I, wherein (t) is the temp. of an inner cover, t4 is the temp. at the center of the coil, Fc is the heat transfer area of the coil, beta Fi/Fc, Fi are the heat transfer areas of the inner cover, and KT is the overall heat transfer coefft. In spite of decreasing the unmber of revolutions of the base fan, the decrease in the KT is small if the gaseous temp. exceeds about 700 deg.C (corresponds roughly to a soaking period), and at above 0.6 ratio of the number of revolutions, it is negligible. The force cooling period is expressed by the equation II, and in the case of force cooling cooler cooling, if the gaseous temp. lowers to a certain degree, the decrease in the KT, is small and is virtually negligible in spite of decreasing the number of revolutions of the base fan. Thereby, the annealing capacity is maintained with a certain decrease in the number of revolutions of the base fan.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11469780A JPS6037864B2 (en) | 1980-08-22 | 1980-08-22 | How to operate the base fan of a box-shaped coil annealing furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11469780A JPS6037864B2 (en) | 1980-08-22 | 1980-08-22 | How to operate the base fan of a box-shaped coil annealing furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5741328A true JPS5741328A (en) | 1982-03-08 |
JPS6037864B2 JPS6037864B2 (en) | 1985-08-28 |
Family
ID=14644358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11469780A Expired JPS6037864B2 (en) | 1980-08-22 | 1980-08-22 | How to operate the base fan of a box-shaped coil annealing furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6037864B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015117415A (en) * | 2013-12-19 | 2015-06-25 | Jfeスチール株式会社 | Cooling method for coil after finish annealing |
-
1980
- 1980-08-22 JP JP11469780A patent/JPS6037864B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015117415A (en) * | 2013-12-19 | 2015-06-25 | Jfeスチール株式会社 | Cooling method for coil after finish annealing |
Also Published As
Publication number | Publication date |
---|---|
JPS6037864B2 (en) | 1985-08-28 |
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