CN103882220A - Furnace end billet heating device for rolling steel heating furnace after rolling delay and heating method - Google Patents
Furnace end billet heating device for rolling steel heating furnace after rolling delay and heating method Download PDFInfo
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- CN103882220A CN103882220A CN201210559526.4A CN201210559526A CN103882220A CN 103882220 A CN103882220 A CN 103882220A CN 201210559526 A CN201210559526 A CN 201210559526A CN 103882220 A CN103882220 A CN 103882220A
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Abstract
The invention discloses a furnace end billet heating device for rolling steel heating furnace after rolling delay and a heating method. In the device, an oxygen gas branch pipe is connected to a combustion air inlet pipe of a first nozzle which is arranged on two sides of a part, which is next to the furnace end, of a soaking zone of a heating furnace; and an oxygen gas adjusting valve is arranged on the oxygen gas branch pipe. The heating method comprises the following steps: adjusting the oxygen gas adjusting valve to modulate the mixing ratio of oxygen gas and air so as to form oxygen-enriched air, wherein the oxygen content is in a range of 21% to 35%; and finally burning the oxygen-enriched air. According to the rolling delay time, the oxygen content of oxygen-enriched air can be adjusted, and finally coal gas is burned with combustion air and oxygen-enriched air so as to quickly heat the first billet and the second billet, thus the first billet and second billet can quickly reach the tapping temperature, at the same time, the oxidized iron sheets on the billet surface are removed, the heating quality of billet is improved, the heating furnace can be quickly recovered, production can be operated normally, the work rate of the rolling production line is increased, and the coal gas is saved.
Description
Technical field
The invention belongs to Heating Process for Steel Rolling technical field, be particularly suitable for the dynamic heat occasion that large-scale heavy slab heater for rolling steel rear slab to be rolled heats up, specifically a kind of device and temperature-rising method being rapidly heated for heater for rolling steel rear burner steel billet to be rolled.
Background technology
It is a kind of successive processes that steel rolling is produced, and slab is generally the continuous warming process in stable state in process furnace.In the time that there are unexpected incidents in rolling line or stops rolling because of roll change, overhaul of the equipments, steel billet can not normally be tapped, can only in stove, stay on, if at this moment burn steel according to normal heating cycle, easily there are the quality problems of overheated or burning, must take corresponding cooling, insulation strategy, reduce steel billet at furnace temperature.And steel billet in soaking zone has been heated to tapping temperature inside and outside in fact, at this moment, after heating demand in stove reduces, pressure in the burner hearth reduces, and it is inevitable that burner is inhaled cold wind phenomenon.The freezing air that fire door seam sucks, the often surface temperature to 1st ~ 2 blocks of steel of burner, particularly four jiaos of temperature have the greatest impact.After milling train maintenance finishes, steel billet need to be rapidly heated, and treats the heat time to reduce, and boosts productivity.The method adopting is at present all to carry out predictive control by calculating machine burning steel mathematical model, improving temperature by soaking zone entirety completes, and be positioned at 1st ~ 2 blocks of steel billets of burner, due to close to fire door, away from heating burner, certainly will become restriction and recover the key point of rolling, simultaneously because burner oxidation is serious, steel billet is longer at residing time in furnace, the more difficult removal of iron scale on surface, and quality problems also can be further serious., many time, 1st ~ 2 blocks of steel billets that are positioned at burner can only be returned for this reason, waste the energy and material.
In " STRATEGY OF ROLLING DELAY ON REHEATING FURNACE " literary composition in the 39th volume first phase of " iron and steel " January in 2004, the to be rolled rear strategy of proposition is that soaking zone hysteresis for some time feed fuels, reduces steel billet temperature peak value.What mainly consider is overall steel billet temperature control, does not consider the problem that burner steel billet local temperature reduces and iron scale difficulty is removed.
" material and metallurgical journal " in September, 2008, in the 7th the 3rd phase of volume " continuous furnace strategy study to be rolled " literary composition, set forth the scheme that adopts computer Mathematical model control furnace temperature.Time to be rolled, should significantly lower the temperature immediately, recover to maintain lower furnace temperature in for some time after to be rolled, rationally control for rear overall steel billet temperature to be rolled.
The patent No. is 92241883.7 utility model patents, disclosed is " furnace head structure of process furnace ", proposes, near on the furnace roof of discharge end, several flame-change burners being housed, to be adjusted to flat flame or spherical flame while normally production, the rotation hot gas flow of ejection forms air curtain, stops freezing air to suck in stove; Rolling mill fault with updraft or spherical flame, can will treat that strip plate is warming up to the steel temperature of coming out of the stove rapidly after removing.This is a kind ofly to adopt different burner flame shapes to control the method that steel billet is rapidly heated.
Therefore, for the process furnace rear steel billet to be rolled problem that is rapidly heated, propose a kind of simple, feasible, be easy to the method controlled, coordinate process furnace mathematical model, can better improve heating steel billet quality time to be rolled, improve operating rate of rolling mill.
Summary of the invention
The object of the invention is to utilize oxygen to mix the principle that can improve intensity of combustion with coal gas, a kind of device and temperature-rising method being rapidly heated for heater for rolling steel rear burner steel billet to be rolled is provided, can make 1 ~ 2 block of steel billet of rear soaking zone burner to be rolled be rapidly heated and iron scale is easy to remove, improve rolling line operating rate, quality product and reduce fuel consumption.
According to actual slab heating stove measuring test result, it is more that fire door seam is inhaled cold wind, and soaking zone is 1.3 by the coefficient of excess air at burner place.Adopt the online temperature measuring device of steel billet (i.e. " black box ") also to show that to the test result of actual slab furnace temperature of heating furnace and steel billet temperature soaking zone is after 20min to be rolled, steel billet limit portion temperature than core temperature low 50 ℃ of left and right, now realizing the main restriction condition of resuming production is fast burner steel billet temperature, especially bight temperature.Along with the prolongation of time to be rolled, in stove, the temperature of steel billet also will progressively decline, and at this moment resume production again and need to heat up simultaneously, and the temperature rise rate of burner can slow down relatively.It is a kind of for heater for rolling steel rear burner steel billet to be rolled heat riser and temperature-rising method fast that the present invention provides on the basis of having analyzed above-mentioned factor.
Concrete device of the present invention is: on the combustion air inlet pipe at process furnace soaking zone near first burner of both sides of burner end, connect an oxygen manifold, flow control valve is installed in oxygen manifold, by regulating oxygen regulating valve and air mixed to form oxygen enrichment, as the combustion-supporting gas of burner, make first pair of burner realize oxygen-enriched combusting.
Temperature-rising method of the present invention is such, by regulating oxygen regulating valve and air mixed to form oxygen enrichment, in the time that end to be rolled needs 1 ~ 2 steel billet temperature of the high burner of Quick, according to the time to be rolled, determine first burner oxygen enrichment percentage of burner end both sides, oxygen enrichment percentage scope is 21% ~ 35%, carries out oxygen-enriched combusting, the temperature of the high burner steel billet of Quick.
The present invention is according to the temperature of process furnace time to be rolled and 1 ~ 2 block of steel billet of required raising burner, determines first pair of burner oxygen enrichment percentage, and oxygen enrichment percentage scope is 21% ~ 35%, carries out oxygen-enriched combusting, the temperature of the high burner steel billet of Quick.
When process furnace beginning to be rolled, the repair time according to expectation reduces the fuel quantity of soaking zone and heating zone, and process furnace soaking zone and heating zone furnace temperature are remained unchanged in the temperature of setting;
When end to be rolled, according to the time to be rolled, adjust the oxygen regulating valve of soaking zone near first burner of both sides of burner end according to following parameters, guarantee that first pair of burner becomes oxygen-enriched combusting, 1st ~ 2 steel billet temperatures are raise fast, reach tapping temperature.
Further be oxidized because oxygen-enriched combusting has accelerated iron oxide on surface of billet steel skin, make to be difficult on steel billet the Fe of removal simultaneously
3o
4rapid conversion is Fe
2o
3, this Fe in steel billet top layer
2o
3after iron scale tapping, be easy to be completely removed through high-pressure water descaling, enter smoothly rolling mills, and improve the quality product of strand.
The present invention is according to burning and heat transfer theory, by replacing part combustion air with oxygen, carry out mixed firing with coal gas, reduce inert gas content, increase the concentration that in coal gas, combustiblecomponents contacts with oxygen, intensity of combustion is sharply increased, improved flame propagation velocity and temperature of combustion, improved soaking zone furnace temperature.And three strong atom CO of radiation capacity in products of combustion
2,h
2o concentration increases, and has improved the radiative transfer between furnace gas and steel billet, thereby can improve fast steel billet temperature.
The present invention's beneficial effect is compared with prior art:
Owing to connecting an oxygen manifold on the combustion air inlet pipe near first burner of both sides of burner end at process furnace soaking zone, flow control valve is installed in oxygen manifold, by regulating oxygen regulating valve and air mixed to form oxygen enrichment, as the combustion-supporting gas of burner, can realize conventional air-breathing and oxygen-enriched combusting two states.After process furnace end to be rolled, need to be rapidly heated time, this is opened burner oxygen regulating valve, according to the time to be rolled, regulate oxygen enrichment percentage, together with combustion air, coal gas is carried out to mixed firing, reach and make 1st ~ 2 steel billet temperatures of soaking zone bring up to fast that tapping temperature, iron oxide on surface of billet steel skin eliminate, improve heating steel billet quality, recovery heating stove is produced normal direct motion, improves rolling line operating rate, saved the beneficial effects such as coal gas fast.
Accompanying drawing explanation
Fig. 1 is that process furnace burner of the present invention and burner are arranged sketch;
Fig. 2 nozzle structure schematic diagram of the present invention.
1 burner in figure, 2 combustion air inlet pipes, 3 oxygen manifold, 4 oxygen regulating valves, 5 burner steel billets
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated:
As shown in Figure 1, 2, on combustion air inlet pipe 2 at process furnace soaking zone near first burner 1 of both sides of burner end, connect an oxygen manifold 3, flow control valve 4 is installed in oxygen manifold, by regulating oxygen regulating valve and air mixed to form oxygen enrichment, in the time that end to be rolled needs 1 ~ 2 steel billet 5 temperature of the high burner of Quick, according to the time to be rolled, determine first burner oxygen enrichment percentage of burner end both sides, oxygen enrichment percentage scope is 21% ~ 35%, carry out oxygen-enriched combusting, the temperature of the high burner steel billet of Quick, the pass of its time to be rolled and oxygen enrichment percentage is:
When milling train breaks down, during process furnace is to be rolled, first reduce soaking zone and heating zone temperature, steel billet temperature is reduced, prevent its overheated or burning; When after end to be rolled, open the oxygen regulating valve of soaking zone first to burner.
According to test result and Theoretical Calculation, formulated the oxygen enrichment percentage that rear steel billet to be rolled is rapidly heated and regulated oxygen flow, make steel billet temperature particularly four arm of angle portion temperature raise fast.Meanwhile, oxygen-enriched combusting has increased burner place oxygen level, the Fe that can make steel billet top layer form during to be rolled
3o
4rapid conversion is Fe
2o
3, after steel billet is come out of the stove, adopting high-pressure water descaling, scale on surface can be eliminated, play the effect that guarantees quality product.
Below by three experimental datas, implementation result of the present invention is described embodiment 1: at 1 of certain steel mill's slab (230mm)
#(walking beam heating furnace, adopt calorific value is 2000 × 4.18 kJ/Nm to process furnace
3mixed gas) on test, when stopping rolling 20min, soaking zone furnace temperature decline 20 ℃, billet surface temperature decline 20 ℃, corner temperature is lower, core temperature remains unchanged substantially.After to be rolled, adopt the inventive method, soaking zone first is adopted to oxygen-enriched combusting to burner, oxygen enrichment percentage is 35%, can improve approximately 470 ℃ than the flame temperature of pure air combustion, the heat transfer capacity between furnace gas and steel billet is quadruplicate relation, thereby radiative transfer improves 6.7 times.All adopt air-breathing, need 10min in advance to start to heat up, and adopt oxygen enrichment 35% combustion-supporting, steel billet temperature can be brought up to fast 1200 ℃ of requirement in 5min, has shortened 50% heat-up time.
Embodiment 2: at 1 of certain steel mill's slab (230mm)
#(walking beam heating furnace, adopt calorific value is 2000 × 4.18 kJ/Nm to process furnace
3mixed gas) on test, when stopping rolling 60min, soaking zone furnace temperature decline 50 ℃, billet surface temperature decline 50 ℃, core temperature decline 10-20 ℃.After end to be rolled, be not only the problem that promotes surperficial steel billet temperature, also needed to consider overall intensification problem, therefore Rich Oxygen Amount should be determined according to combined factors such as all steel billet additional heat speed in steel billet rate of heat transfer, stove.Adopt the inventive method, soaking zone first is adopted to oxygen-enriched combusting to burner, oxygen enrichment percentage is 30%, can improve approximately 300 ℃ than the flame temperature of pure air combustion, on the basis of taking into account other factors, steel billet temperature can be brought up to fast 1200 ℃ of requirement in 14min, has shortened 30% heat-up time.
Embodiment 3: at 1 of certain steel mill's slab (230mm)
#(walking beam heating furnace, adopt calorific value is 2000 × 4.18 kJ/Nm to process furnace
3mixed gas) on test, when stopping rolling 100min, soaking zone furnace temperature decline 80 ℃, billet surface temperature decline 80 ℃, core temperature decline 30 ℃.After end to be rolled, be not only the problem that promotes surperficial steel billet temperature, also needed to consider overall intensification problem, therefore Rich Oxygen Amount should be determined according to combined factors such as all steel billet additional heat speed in steel billet rate of heat transfer, stove.Adopt the inventive method, soaking zone first is adopted to oxygen-enriched combusting to burner, oxygen enrichment percentage is 25%, can improve approximately 200 ℃ than the flame temperature of pure air combustion, on the basis of taking into account other factors, steel billet temperature can be brought up to fast 1200 ℃ of requirement in 28min, has shortened 20% heat-up time.
Prove by above-described embodiment, due to owing to connecting an oxygen manifold on the combustion air inlet pipe near first burner of both sides of burner end at process furnace soaking zone, flow control valve is installed in oxygen manifold, by regulating oxygen regulating valve and air mixed to form oxygen enrichment, as the combustion-supporting gas of burner, can realize conventional air-breathing and oxygen-enriched combusting two states.Can make that 1st ~ 2 steel billet temperatures of soaking zone are brought up to tapping temperature fast, iron oxide on surface of billet steel skin eliminates, can improve heating steel billet quality, recovery heating stove is produced normal direct motion, improves rolling line operating rate, saved the beneficial effects such as coal gas fast.
Claims (3)
1. the device being rapidly heated for heater for rolling steel rear burner steel billet to be rolled, it is characterized in that, the upper oxygen manifold (3) that connects of combustion air inlet pipe (2) at process furnace soaking zone near first burners of both sides (1) of burner end is provided with oxygen regulating valve (4) in oxygen manifold.
2. one kind adopts the temperature-rising method of the device that claim 1 is rapidly heated for heater for rolling steel rear burner steel billet to be rolled, it is characterized in that, regulate oxygen and air mixed ratio to form oxygen enrichment by oxygen regulating valve, in the time that end to be rolled needs Quick 1 ~ 2 block of steel billet of high burner (5) temperature, according to the time to be rolled, first burner oxygen enrichment percentage of determining burner end both sides, by volume percentage ratio oxygen enrichment percentage scope is 21% ~ 35%, carries out oxygen-enriched combusting.
3. the temperature-rising method of the device being rapidly heated for heater for rolling steel rear burner steel billet to be rolled according to claim 2, is characterized in that, the pass of its time to be rolled and oxygen enrichment percentage is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559526.4A CN103882220B (en) | 2012-12-21 | 2012-12-21 | For heater for rolling steel rear burner slab heating-up device to be rolled and temperature-rising method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559526.4A CN103882220B (en) | 2012-12-21 | 2012-12-21 | For heater for rolling steel rear burner slab heating-up device to be rolled and temperature-rising method |
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| CN103882220B CN103882220B (en) | 2015-09-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473945A (en) * | 2003-07-15 | 2004-02-11 | 上海应用技术学院 | Locally reinforced heating method and device for hot rolling steel billet before discharging |
| CN201347437Y (en) * | 2009-01-15 | 2009-11-18 | 莱芜钢铁集团有限公司 | Device for manufacturing metallic pellet through utilizing direct reduction of oxygen-rich combustion of rotary furnace |
| CN102560076A (en) * | 2010-12-17 | 2012-07-11 | 鞍钢股份有限公司 | Method for solving heating by one furnace shared by grain-oriented silicon steel and other steel with enriched oxygen |
-
2012
- 2012-12-21 CN CN201210559526.4A patent/CN103882220B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473945A (en) * | 2003-07-15 | 2004-02-11 | 上海应用技术学院 | Locally reinforced heating method and device for hot rolling steel billet before discharging |
| CN201347437Y (en) * | 2009-01-15 | 2009-11-18 | 莱芜钢铁集团有限公司 | Device for manufacturing metallic pellet through utilizing direct reduction of oxygen-rich combustion of rotary furnace |
| CN102560076A (en) * | 2010-12-17 | 2012-07-11 | 鞍钢股份有限公司 | Method for solving heating by one furnace shared by grain-oriented silicon steel and other steel with enriched oxygen |
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| CN103882220B (en) | 2015-09-02 |
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