CN105486082A - Cold air preventing device and method for heating furnace - Google Patents
Cold air preventing device and method for heating furnace Download PDFInfo
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- CN105486082A CN105486082A CN201410479878.8A CN201410479878A CN105486082A CN 105486082 A CN105486082 A CN 105486082A CN 201410479878 A CN201410479878 A CN 201410479878A CN 105486082 A CN105486082 A CN 105486082A
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- heating furnace
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Abstract
The invention discloses a cold air preventing device and a cold air preventing method for a heating furnace. A retaining wall which is as wide as the heating furnace is additionally arranged inside a discharge furnace door of the heating furnace; the lower end of the retaining wall is positioned at a position which is 100-200mm higher than the highest position of discharge plate blank; at least three branches with manual regulating valves are arranged between the retaining wall and the discharge furnace door; the upper ends of the branch tubes are connected to a header tube; and the header tube is connected to a chimney through a smoke exhaust pipeline with an electric regulating valve. When the plate blank is discharged out of the furnace, the manual regulating valves and the electric regulating valve on the smoke exhaust pipeline of the discharge furnace door are opened, and the original electric regulating valve is regulated to control the inner part of the heating furnace to be in positive pressure; cold air entering the heating furnace from the discharge door is mostly retained out of the retaining wall, is absorbed into the cold air preventing devicequickly and is discharged through thesmoke exhuast pipeline and the chimney. The device provided by the invention can prevent coldair from entering into the heating furnace, so that temperature decrease of steel blanks is reduced and heating uniformity of the steel blanks can be guaranteed. Therefore, quality problems such as a wedge shape and the like during rolling are avoided, the energy resources can be greatly saved, and the production cost is reduced.
Description
Technical field
The invention belongs to industrial furnace technical field, particularly a kind of walking beam furnace device and method of preventing cold wind from entering.
Background technology
Equipment of Hot Strip Mill generally uses walking beam furnace to heat steel billet, and what the smoke discharging pipe of walking beam furnace was all arranged on heating furnace enters stove end, therefore directly can enter smoke discharging pipe and chimney by entering cold air that furnace door enters and be discharged into aerial.But when steel billet is come out of the stove, need to come out of the stove oven door opening, in the process that steel billet shifts out, cold air can enter inside heating furnace.Close in the process of heating at fire door, burn out fire door because over-pressure control in stove can cause flame to scurry out from the gap of fire door and body of heater, therefore, in fact furnace pressure is tiny structure control.In this case, cool exterior air can enter in stove from the gap of fire door and body of heater.Even and if when coming out of the stove oven door opening, adjustment heating furnace pressure, also cannot avoid still having entering of a large amount of cold air.Because cold air density is large, presses close to billet surface and steel billet temperature is reduced, and non-uniform temperature, the temperature of steel billet raises from the position near fire door gradually to the direction temperature in stove, can cause the quality problems such as slab wedge shape when rolling.
For solving the problem that cold wind enters, have employed, at soaking zone, reverse burner is installed, to form unburnt flame, increase the pressure near furnace door on the one hand, make the measures such as the cold air burning entered on the other hand, but defect is flame still can scurry out from the gap of fire door, burns fire door, and greatly adds the consumption of the energy.
Summary of the invention
The present invention aims to provide one and can effectively prevent cold air from entering in heating furnace, thus avoids the quality problems because steel billet temperature drop and temperature inequality cause, and reduces the anti-cooling air unit of heating furnace and the method for energy resource consumption.
For this reason, the solution that the present invention takes is:
The anti-cooling air unit of a kind of heating furnace, comprise chimney, it is characterized in that, set up barricade, manual modulation valve, arm, collector, electric control valve and smoke discharging pipe, go out inside furnace door to set up barricade wide with heating furnace together at heating furnace, barricade lower end is positioned at the slab extreme higher position upwards 100 ~ 200mm that comes out of the stove, barricade and go out between furnace door to be provided with at least 3 arms with manual modulation valve, arm upper end connects a collector, and collector is connected with chimney by the smoke discharging pipe with electric control valve.
Described arm is 5.
A method for the anti-cold wind of heating furnace, it specifically adjusts control method and step is:
Manual modulation valve adjusts: the opening degree of manual modulation valve is determined according to the position correspondence of place arm on collector, and the closer to heating furnace centre position, the opening degree of its manual modulation valve is also larger, equal to ensure the flow of each arm; The opening degree of manual modulation valve adjusts when heating furnace blowing out, permanent opening degree after adjustment; During adjustment, the external flowmeter of each arm, electric control valve standard-sized sheet, first all manual modulation valves are fixed on same opening degree, then with the flow registration M of the arm at one of them manual modulation valve place for standard, then the opening degree of other manual modulation valves is adjusted successively, its flow is made to reach M, now return to check the flow registration of all arms again, if the flow registration difference of all arms is not in allowed limits, repeat above-mentioned steps, until the flow registration difference of all arms in allowed limits;
The adjustment of electric control valve: when heating furnace shutdown maintenance, the adjustment of electric control valve is divided into oven door opening of coming out of the stove, go out furnace door closes two kinds of situations:
Under oven door opening of coming out of the stove state, barricade evenly arranges plastic strip, close gas valve and stifled blind plate, start blower fan to blow in heating furnace, force value when making the pressure in heating furnace reach heating, the opening degree of electric control valve increases gradually from 0, until when plastic strip floats towards out furnace door, writes down electric control valve opening degree N now
0; Then, under heating furnace normal operating conditions, oven door opening of coming out of the stove, electric control valve opening degree is set as N
0, observe and whether have flare to cross barricade, according to actual conditions adjustment electric control valve opening degree until there is flare to cross barricade, record electric control valve opening degree N now
1, as the opening degree a reference value under oven door opening state of coming out of the stove, unless under large change or routine test situation occur equipment state, otherwise no longer change;
Under going out furnace door closed condition, barricade evenly arranges plastic strip, close gas valve and stifled blind plate, start blower fan to blow in heating furnace, force value when making the pressure in heating furnace reach heating, the opening degree of electric control valve increases gradually from 0, until when plastic strip floats towards out furnace door, writes down electric control valve opening degree N now
2; As the opening degree a reference value gone out under furnace door closed condition, unless under large change or routine test situation occur equipment state, otherwise no longer change;
When slab is come out of the stove, while opening out furnace door, the opening degree of electric control valve is by N
2to N
1regulate, meanwhile, by the former electric control valve on the former smoke discharging pipe of adjustment heating furnace, controlling heating furnace pressure is pressure-fired; Barricade lower end and come out of the stove and only have the gap of 100 ~ 200mm between slab, thermal current in heating furnace is difficult to cross barricade, and enter the cold air in heating furnace under the stop of barricade by going out furnace door, then be blocked on outside barricade, and heating furnace pressure is higher than a pipe pressure, to negative pressure be formed in anti-cooling air unit inside, cold air is inhaled into rapidly in anti-cooling air unit, and be discharged by smoke discharging pipe and chimney;
After slab is come out of the stove and terminated, the opening degree of electric control valve is by N
1to N
2regulate, under the state going out furnace door closedown, the opening degree of electric control valve controls at N always
2, make the cold air entering heating furnace through going out the gap between furnace door and heating furnace body enter chimney enter air through manual modulation valve, electric control valve.
Beneficial effect of the present invention is:
The anti-cooling air unit of the present invention and method can effectively prevent cold air from entering in heating furnace, reduce steel billet temperature and reduce, and ensure that billet heating temperature is even, thus occur the quality problems such as wedge shape when avoiding rolling, and greatly can save the energy, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the anti-cooling air unit structural representation of heating furnace;
Fig. 2 is the A-A sectional view of Fig. 1.
In figure: heating furnace 1, former smoke discharging pipe 2, former electric control valve 3, chimney 4, smoke discharging pipe 5, electric control valve 6, collector 7, arm 8, manual modulation valve 9, barricade 10, go out furnace door 11.Arrow represents air motion direction.
Detailed description of the invention
As seen from Figure 1, the anti-cooling air unit of heating furnace of the present invention, is on the basis of the former smoke discharging pipe 2 of heating furnace 1, former electric control valve 3 and chimney 4, has set up smoke discharging pipe 5, electric control valve 6, collector 7, arm 8, manual modulation valve 9 and barricade 10.
Barricade 10 is built by laying bricks or stones and is gone out inside furnace door 11 at heating furnace 1, and width and the heating furnace 1 of barricade 10 are wide, and the lower end of barricade 10 is positioned at the slab extreme higher position upwards 100 ~ 200mm that comes out of the stove.At barricade 10 and go out between furnace door 11 to be equidistantly provided with 5 arms 8 (see Fig. 2), the upper end of 5 arms 8 is connected on collector 7, and 5 arms 8 are equipped with manual modulation valve 9, collector 7 is connected with a smoke discharging pipe 5 in centre position above, smoke discharging pipe 5 is provided with electric control valve 6, and the other end of smoke discharging pipe 5 is communicated with chimney 4.
The concrete adjustment control method of the anti-cold wind of heating furnace of the present invention and step are:
Manual modulation valve 9 adjusts: the opening degree of manual modulation valve 9 is determined according to the position correspondence of place arm 8 on collector 7, and the closer to heating furnace 1 centre position, the opening degree of its manual modulation valve 9 is also larger, equal to ensure the flow of each arm 8.The opening degree of manual modulation valve 9 adjusts when heating furnace 1 blowing out, permanent opening degree after adjustment.
During adjustment, the external flowmeter of each arm 8, electric control valve 6 standard-sized sheet, first 5 manual modulation valves 9 are fixed on same opening degree, then with the flow registration M of the arm 8 at manual modulation valve 9 place of middle (the 3rd) for standard, then the opening degree of other 4 manual modulation valves 9 is adjusted successively, its flow is made to reach M, now return to check the flow registration of 5 arms 8 again, if the flow registration difference of 5 arms 8 is not in allowed limits, repeat above-mentioned steps, until the flow registration difference of 5 arms 8 in allowed limits.
The adjustment of electric control valve 6: when heating furnace shutdown maintenance, the adjustment of electric control valve 6 is divided into furnace door 11 to open, go out furnace door 11 closes two kinds of situations:
Under going out furnace door 11 open mode, barricade 10 evenly arranges plastic strip, the specification of plastic strip can be 40 × 200mm, close gas valve and stifled blind plate, start blower fan to blow in heating furnace 1, force value when making the pressure in heating furnace 1 reach heating, the opening degree of electric control valve 6 increases gradually from 0, until when plastic strip floats towards out furnace door 11 a little, write down electric control valve 6 opening degree N now
0; Then under heating furnace 1 normal operating conditions, will go out furnace door 11 and open, electric control valve 6 opening degree is set as N
0, observe and whether have flare to cross barricade 10, according to the opening degree of actual conditions adjustment electric control valve 6, until there is a small amount of flare to cross barricade 10, the opening degree N of record electric control valve 6 now
1, as the opening degree a reference value gone out under furnace door 11 open mode, unless under large change or routine test situation occur equipment state, otherwise no longer change.
Under going out furnace door 11 closed condition, barricade 10 evenly arranges plastic strip, close gas valve and stifled blind plate, start blower fan to blow in heating furnace 1, force value when making the pressure in heating furnace 1 reach heating, the opening degree of electric control valve 6 increases gradually from 0, until when plastic strip floats towards out furnace door 11 a little, writes down the opening degree N of electric control valve 6 now
2; As the opening degree a reference value gone out under furnace door 11 closed condition, unless under large change or routine test situation occur equipment state, otherwise no longer change.
When slab is come out of the stove, while opening out furnace door 11, the opening degree of electric control valve 6 is by N
2to N
1regulate, meanwhile, by the former electric control valve 3 on the former smoke discharging pipe of adjustment heating furnace 12, controlling pressure in heating furnace 1 is pressure-fired; Due to barricade 10 lower end and come out of the stove and only have the gap of 100 ~ 200mm between slab, thermal current on the one hand in heating furnace 1 seldom can cross barricade 10, on the other hand enter cold air in heating furnace 1 under the stop of barricade 10 by going out furnace door 11, then mostly be blocked on outside barricade 10, and because pressure in heating furnace 1 is higher than arm 8 pressure, thus will form negative pressure in anti-cooling air unit inside, and cold air will be inhaled into rapidly in anti-cooling air unit, and be discharged by smoke discharging pipe 5 and chimney 4.
After slab is come out of the stove and terminated, the opening degree of electric control valve 6 is by N
1to N
2regulate, under the state going out furnace door 11 closedown, the opening degree of electric control valve 6 controls at N always
2, make the cold air entering heating furnace 1 through going out the gap between furnace door 11 and heating furnace 1 body of heater enter chimney 4 enter air through manual modulation valve 9, electric control valve 6, and the thermal current in heating furnace 1 can seldom can be crossed barricade 10 and be discharged.
Claims (3)
1. the anti-cooling air unit of heating furnace, comprise former smoke discharging pipe, former electric control valve and chimney, it is characterized in that, set up barricade, manual modulation valve, arm, collector, electric control valve and smoke discharging pipe, go out inside furnace door to set up barricade wide with heating furnace together at heating furnace, barricade lower end is positioned at the slab extreme higher position upwards 100 ~ 200mm that comes out of the stove, barricade and go out between furnace door to be provided with at least 3 arms with manual modulation valve, arm upper end connects a collector, and collector is connected with chimney by the smoke discharging pipe with electric control valve.
2. the anti-cooling air unit of heating furnace according to claim 1, is characterized in that, described arm is 5.
3. application rights requires a method for the anti-cooling air unit of heating furnace described in 1, it is characterized in that, concrete adjustment control method and step are:
Manual modulation valve adjusts: the opening degree of manual modulation valve is determined according to the position correspondence of place arm on collector, and the closer to heating furnace centre position, the opening degree of its manual modulation valve is also larger, equal to ensure the flow of each arm; The opening degree of manual modulation valve adjusts when heating furnace blowing out, permanent opening degree after adjustment; During adjustment, the external flowmeter of each arm, electric control valve standard-sized sheet, first all manual modulation valves are fixed on same opening degree, then with the flow registration M of the arm at one of them manual modulation valve place for standard, then the opening degree of other manual modulation valves is adjusted successively, its flow is made to reach M, now return to check the flow registration of all arms again, if the flow registration difference of all arms is not in allowed limits, repeat above-mentioned steps, until the flow registration difference of all arms in allowed limits;
The adjustment of electric control valve: when heating furnace shutdown maintenance, the adjustment of electric control valve is divided into oven door opening of coming out of the stove, go out furnace door closes two kinds of situations:
Under oven door opening of coming out of the stove state, barricade evenly arranges plastic strip, close gas valve and stifled blind plate, start blower fan to blow in heating furnace, force value when making the pressure in heating furnace reach heating, the opening degree of electric control valve increases gradually from 0, until when plastic strip floats towards out furnace door, writes down electric control valve opening degree N now
0; Then, under heating furnace normal operating conditions, oven door opening of coming out of the stove, electric control valve opening degree is set as N
0, observe and whether have flare to cross barricade, according to actual conditions adjustment electric control valve opening degree until there is flare to cross barricade, record electric control valve opening degree N now
1, as the opening degree a reference value under oven door opening state of coming out of the stove, unless under large change or routine test situation occur equipment state, otherwise no longer change;
Under going out furnace door closed condition, barricade evenly arranges plastic strip, close gas valve and stifled blind plate, start blower fan to blow in heating furnace, force value when making the pressure in heating furnace reach heating, the opening degree of electric control valve increases gradually from 0, until when plastic strip floats towards out furnace door, writes down electric control valve opening degree N now
2; As the opening degree a reference value gone out under furnace door closed condition, unless under large change or routine test situation occur equipment state, otherwise no longer change;
When slab is come out of the stove, while opening out furnace door, the opening degree of electric control valve is by N
2to N
1regulate, meanwhile, by the former electric control valve on the former smoke discharging pipe of adjustment heating furnace, controlling heating furnace pressure is pressure-fired;
After slab is come out of the stove and terminated, the opening degree of electric control valve is by N
1to N
2regulate, under the state going out furnace door closedown, the opening degree of electric control valve controls at N always
2, make the cold air entering heating furnace through going out the gap between furnace door and heating furnace body enter chimney enter air through manual modulation valve, electric control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410479878.8A CN105486082A (en) | 2014-09-19 | 2014-09-19 | Cold air preventing device and method for heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410479878.8A CN105486082A (en) | 2014-09-19 | 2014-09-19 | Cold air preventing device and method for heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105486082A true CN105486082A (en) | 2016-04-13 |
Family
ID=55673224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410479878.8A Pending CN105486082A (en) | 2014-09-19 | 2014-09-19 | Cold air preventing device and method for heating furnace |
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| Country | Link |
|---|---|
| CN (1) | CN105486082A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201233175Y (en) * | 2008-06-30 | 2009-05-06 | 中冶华天工程技术有限公司 | Heat insulation device for heating-furnace |
| CN201711490U (en) * | 2010-07-13 | 2011-01-19 | 大连昌荣炉业有限公司 | Small-sized three-stage push rod continuous forging heating furnace |
| CN201720387U (en) * | 2010-06-02 | 2011-01-26 | 中国汽车工业工程公司 | Two-position fume exhaust chamber-type forge furnace |
| CN102061367A (en) * | 2011-01-26 | 2011-05-18 | 中冶京诚工程技术有限公司 | Solid solution heat treatment furnace |
| JP2011196615A (en) * | 2010-03-19 | 2011-10-06 | Jfe Steel Corp | Waste heat recovery equipment of heating furnace, and method of utilizing waste heat |
| CN102912110A (en) * | 2012-10-30 | 2013-02-06 | 鞍钢股份有限公司 | Method for reducing cold air suction of furnace end of silicon steel furnace |
-
2014
- 2014-09-19 CN CN201410479878.8A patent/CN105486082A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201233175Y (en) * | 2008-06-30 | 2009-05-06 | 中冶华天工程技术有限公司 | Heat insulation device for heating-furnace |
| JP2011196615A (en) * | 2010-03-19 | 2011-10-06 | Jfe Steel Corp | Waste heat recovery equipment of heating furnace, and method of utilizing waste heat |
| CN201720387U (en) * | 2010-06-02 | 2011-01-26 | 中国汽车工业工程公司 | Two-position fume exhaust chamber-type forge furnace |
| CN201711490U (en) * | 2010-07-13 | 2011-01-19 | 大连昌荣炉业有限公司 | Small-sized three-stage push rod continuous forging heating furnace |
| CN102061367A (en) * | 2011-01-26 | 2011-05-18 | 中冶京诚工程技术有限公司 | Solid solution heat treatment furnace |
| CN102912110A (en) * | 2012-10-30 | 2013-02-06 | 鞍钢股份有限公司 | Method for reducing cold air suction of furnace end of silicon steel furnace |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160413 |