CN102828018A - Method for improving production efficiency of cover-type furnace and saving energy - Google Patents
Method for improving production efficiency of cover-type furnace and saving energy Download PDFInfo
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- CN102828018A CN102828018A CN2012103673038A CN201210367303A CN102828018A CN 102828018 A CN102828018 A CN 102828018A CN 2012103673038 A CN2012103673038 A CN 2012103673038A CN 201210367303 A CN201210367303 A CN 201210367303A CN 102828018 A CN102828018 A CN 102828018A
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Abstract
The invention relates to a method for improving production efficiency of a cover-type furnace and saving energy. By virtue of balance computation on convection current and thermal radiation transmission at different temperatures after a cover is suspended, a method comprising that a heating cover is suspended away and natural cooling is carried out is obtained and adopted, and when temperature in the cover is reduced to 620 DEG C, a cooling cover is covered for cooling. The method disclosed by the invention has the advantages that the production efficiency of the cover-type furnace can be improved, electrical energy of a cooling fan can be reduced, and production period can be shortened.
Description
Technical field
The present invention relates to a kind of raising bell furnace production efficiency and method for saving energy.
Background technology
The heat passage form of bell furnace process of cooling is mainly convection current and thermal radiation, and cold rolling mill 1# irdome formula furnace annealing flow process is: annealing process finishes, and hanging away behind the heating mantles directly, the button cooling cowl cools off.Directly button cooling cowl cooling in this flow process is mainly by the transmission of heat by convection of cooling aerofoil fan to the inner cover heat.At present, the inner cover temperature of annealing process after hanging away heating mantles is about 700 ℃, and this moment, thermal-radiating heat transfer effect was much larger than transmission of heat by convection; Directly the cooling of button cooling cowl has hindered thermal-radiating heat transfer effect on the contrary; Not only temperature decline is slack-off, reduces production efficiency, and waste cooling blower electric energy.
Summary of the invention
For overcoming the deficiency of prior art, the purpose of this invention is to provide a kind of raising bell furnace production efficiency and method for saving energy, can improve bell furnace production efficiency, reduce the cooling blower electric energy.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
1, a kind of raising bell furnace production efficiency and method for saving energy may further comprise the steps:
1) to hanging the cover convection current of differing temps afterwards and the EQUILIBRIUM CALCULATION FOR PROCESS method of radiant heat transfer:
A convective heat exchange hot-fluid
Convective heat flow density is: Q1=H (T1-T2)
In the formula: T1 – heating finishes back inner cover surface temperature, the inner cover surface temperature in the T2-process of cooling, H-coil of strip convection transfer rate, H=0.023R
0.8Pr
0.4A/ (D1-D2);
In the formula: R-inner cover Reynolds number; D1, D2-cooling cowl internal diameter, the inner cover external diameter; The Pr-Prandtl number; A one gas viscosity;
B radiation heat transfer hot-fluid
Radiant heat flux density: Q2=E σ (T1
4-T2
4)
In the formula: the T1-heating finishes back inner cover surface temperature, the inner cover surface temperature in the T2-process of cooling, E-coil of strip blackness, σ-radiation constant, σ=5.67*10
-8
Suppose that the furnace gas temperature in the coil annealing process equates with the inner cover surface temperature; Inner cover surface temperature T1 was 700 ℃ after then heating finished usually, calculated in the annealing process of cooling temperature variant convective heat flow density and radiant heat flux density respectively; And the size of the two value relatively: when 620 ℃＜T2＜700 ℃; Q1＜Q2, when T2＜620 ℃, Q1＞Q2;
This shows, be 700-620 ℃ when interval in inner cover 2 temperature, and thermal-radiating heat transfer effect is greater than transmission of heat by convection, and 620 ℃ of following temperature, the heat transfer effect of convection current is greater than thermal-radiating heat transfer effect;
Directly cover cooling cowl 1 cooling in 700-620 ℃ of interval and hindered thermal-radiating heat transfer effect on the contrary, confirm that therefore best cover cooling cowl 1 temperature is 620 ℃, this moment, cooling performance was best;
2) on coil of strip 3 annealing tables 4, have the furnace gas temperature galvanic couple to detect annealing temperature automatically and be presented on the HNI operation screen, after the annealing heating finishes, by operator from inner cover 2 naturally cooling behind the heating mantles of hanging oneself away;
3) when the galvanic couple temperature on the HNI operation screen is reduced to 620 ℃, operator again on inner cover 2 covering cooling cowl 1 cool off.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure: 1-cooling cowl 2-inner cover 3-coil of strip 4-table.
Embodiment
Below in conjunction with Figure of description the present invention is described in detail, but should be noted that enforcement of the present invention is not limited to following embodiment.
See Fig. 1, a kind of raising bell furnace production efficiency and method for saving energy may further comprise the steps:
1) to hanging the cover convection current of differing temps afterwards and the EQUILIBRIUM CALCULATION FOR PROCESS of radiant heat transfer:
A convective heat exchange hot-fluid
Convective heat flow density is: Q1=H (T1-T2)
In the formula: T1 – heating finishes back inner cover 2 surface temperatures, inner cover 2 surface temperatures in the T2-process of cooling, H-coil of strip convection transfer rate, H=0.023R
0.8Pr
0.4A/ (D1-D2);
In the formula: R-inner cover Reynolds number; D1, D2-cooling cowl 1 internal diameter, inner cover 2 external diameters; The Pr-Prandtl number; A one gas viscosity;
B radiation heat transfer hot-fluid
Radiant heat flux density: Q2=E σ (T1
4-T2
4)
In the formula: the T1-heating finishes back inner cover 2 surface temperatures, inner cover 2 surface temperatures in the T2-process of cooling, E-coil of strip blackness, σ-radiation constant, σ=5.67*10
-8
Suppose that the furnace gas temperature in the coil annealing process equates with inner cover 2 surface temperatures, inner cover 2 surface temperature T1 were 700 ℃ after then heating finished usually; Calculate in the annealing process of cooling temperature variant convective heat flow density and radiant heat flux density, and the size of the two value of comparison respectively: when 620 ℃＜T2＜700 ℃, Q1＜Q2, when T2＜620 ℃, Q1＞Q2;
This shows, be 700-620 ℃ when interval in inner cover 2 temperature, and thermal-radiating heat transfer effect is greater than transmission of heat by convection, and 620 ℃ of following temperature, the heat transfer effect of convection current is greater than thermal-radiating heat transfer effect;
Directly detain cooling cowl 1 cooling in 700-620 ℃ of interval and hindered thermal-radiating heat transfer effect on the contrary, confirm that therefore best button cooling cowl 1 temperature is 620 ℃, this moment, cooling performance was best;
2) on coil of strip 3 annealing tables 4, have the furnace gas temperature galvanic couple to detect annealing temperature automatically and be presented on the HNI operation screen, after the annealing heating finishes, by operator from inner cover 2 naturally cooling behind the heating mantles of hanging oneself away;
3) when the galvanic couple temperature on the HNI operation screen is reduced to 620 ℃, operator again on inner cover 2 covering cooling cowl 1 cool off.
The present invention can improve bell furnace production efficiency, reduces the cooling blower electric energy, shortens the production cycle, and the annual production capacity that improves reduces power consumption.
Claims (1)
1. raising bell furnace production efficiency and method for saving energy is characterized in that, may further comprise the steps:
1) to hanging the cover convection current of differing temps afterwards and the EQUILIBRIUM CALCULATION FOR PROCESS method of radiant heat transfer:
A convective heat exchange hot-fluid
Convective heat flow density is: Q1=H (T1-T2)
In the formula: T1 – heating finishes back inner cover surface temperature, the inner cover surface temperature in the T2-process of cooling, H-coil of strip convection transfer rate, H=0.023R
0.8Pr
0.4A/ (D1-D2);
In the formula: R-inner cover Reynolds number; D1, D2-cooling cowl internal diameter, the inner cover external diameter; The Pr-Prandtl number; A one gas viscosity;
B radiation heat transfer hot-fluid
Radiant heat flux density: Q2=E σ (T1
4-T2
4)
In the formula: the T1-heating finishes back inner cover surface temperature, the inner cover surface temperature in the T2-process of cooling, E-coil of strip blackness, σ-radiation constant, σ=5.67*10
-8
Suppose that the furnace gas temperature in the coil annealing process equates with the inner cover surface temperature; Inner cover surface temperature T1 was 700 ℃ after then heating finished usually, calculated in the annealing process of cooling temperature variant convective heat flow density and radiant heat flux density respectively; And the size of the two value relatively: when 620 ℃＜T2＜700 ℃; Q1＜Q2, when T2＜620 ℃, Q1＞Q2;
This shows, be 700-620 ℃ when interval in inner cover 2 temperature, and thermal-radiating heat transfer effect is greater than transmission of heat by convection, and 620 ℃ of following temperature, the heat transfer effect of convection current is greater than thermal-radiating heat transfer effect;
Directly cover cooling cowl 1 cooling in 700-620 ℃ of interval and hindered thermal-radiating heat transfer effect on the contrary, confirm that therefore best cover cooling cowl 1 temperature is 620 ℃, this moment, cooling performance was best;
2) on coil of strip 3 annealing tables 4, have the furnace gas temperature galvanic couple to detect annealing temperature automatically and be presented on the HNI operation screen, after the annealing heating finishes, by operator from inner cover 2 naturally cooling behind the heating mantles of hanging oneself away;
3) when the galvanic couple temperature on the HNI operation screen is reduced to 620 ℃, operator again on inner cover 2 covering cooling cowl 1 cool off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103673038A CN102828018A (en) | 2012-09-27 | 2012-09-27 | Method for improving production efficiency of cover-type furnace and saving energy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103673038A CN102828018A (en) | 2012-09-27 | 2012-09-27 | Method for improving production efficiency of cover-type furnace and saving energy |
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|---|---|
| CN102828018A true CN102828018A (en) | 2012-12-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06271945A (en) * | 1993-03-18 | 1994-09-27 | Chugai Ro Co Ltd | Cooling method in bell type annealing furnace and its structure |
| CN101069943A (en) * | 2006-05-12 | 2007-11-14 | 武汉分享科工贸有限公司 | Method for making orientation-free cold-rolled electric steel-board |
| CN101139652A (en) * | 2007-10-26 | 2008-03-12 | 武汉钢铁(集团)公司 | Off-line prediction method for bell-type furnace steel roll annealing process |
| CN102023572A (en) * | 2010-12-14 | 2011-04-20 | 陆金桂 | All-hydrogen hood-type furnace neural network control technology |
| CN102220466A (en) * | 2011-05-04 | 2011-10-19 | 莱芜市泰山冷轧板有限公司 | Method for producing semi-processed cold-rolled non-oriented electrical steel |
-
2012
- 2012-09-27 CN CN2012103673038A patent/CN102828018A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06271945A (en) * | 1993-03-18 | 1994-09-27 | Chugai Ro Co Ltd | Cooling method in bell type annealing furnace and its structure |
| CN101069943A (en) * | 2006-05-12 | 2007-11-14 | 武汉分享科工贸有限公司 | Method for making orientation-free cold-rolled electric steel-board |
| CN101139652A (en) * | 2007-10-26 | 2008-03-12 | 武汉钢铁(集团)公司 | Off-line prediction method for bell-type furnace steel roll annealing process |
| CN102023572A (en) * | 2010-12-14 | 2011-04-20 | 陆金桂 | All-hydrogen hood-type furnace neural network control technology |
| CN102220466A (en) * | 2011-05-04 | 2011-10-19 | 莱芜市泰山冷轧板有限公司 | Method for producing semi-processed cold-rolled non-oriented electrical steel |
Non-Patent Citations (1)
| Title |
|---|
| 王骏: "带钢退火用煤气罩式炉", 《上海金属》 * |
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Application publication date: 20121219 |