CN103350220A - Heat accumulating type steel ladle baking system capable of remarkably reducing NOX (nitrogen oxide) and baking method - Google Patents
Heat accumulating type steel ladle baking system capable of remarkably reducing NOX (nitrogen oxide) and baking method Download PDFInfo
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- CN103350220A CN103350220A CN2013102680575A CN201310268057A CN103350220A CN 103350220 A CN103350220 A CN 103350220A CN 2013102680575 A CN2013102680575 A CN 2013102680575A CN 201310268057 A CN201310268057 A CN 201310268057A CN 103350220 A CN103350220 A CN 103350220A
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Abstract
The invention provides a heat accumulating type steel ladle baking system capable of remarkably reducing NOX and a baking method. The heat accumulating type steel ladle baking system capable of remarkably reducing NOX comprises a steel ladle, at least two combustors, a fuel gas subsystem, a combustion air system, a smoke exhaust subsystem, an air-fuel gas reversing valve and a control subsystem, wherein a heat retainer, at least one concentrated combustion nozzle and at least one light combustion nozzle are arranged in each combustor; and during baking, the fuel gas sprayed out of the concentrated combustion nozzles combusts concentratedly, and simultaneously, the fuel gas sprayed out of the light combustion nozzles combusts lightly. Compared with the prior art, the heat accumulating type combustion is combined with the concentrated combustion and the light combustion, so that the temperature in a furnace is very uniform, NOX pollutants are prevented from being generated, the maximum reduction amount can be higher than 70%, and the problem of high pollution due to the combustion is completely solved by virtue of the combustion manner.
Description
Technical field
The present invention relates to the technical field of ladle baking, particularly a kind of the heat storage type combustion mode is combined with Concentration-decentration Split Combustion, can save energy, and can significantly reduce NO
XRegenerative Ladle Baking system and baking method.
Background technology
At present, ladle baking generally adopts regenerative combustion system, and the thermal efficiency of this combustion system is high, but energy savings, but have NO
XPollutant discharge amount is large, with serious pollution defective.
Thermal NO according to Zdldovich Frank-Kamenetskii relation
XGenerative theory, NO
XGrowing amount main relevant with ignition temperature, and exponent function relation basically.According to this principle, if will reduce NO
XGrowing amount will reduce ignition temperature, and the combustion system of existing heat accumulating type can be preheating to respectively 1000 ℃ with combustion gas and air.Generally, the air of fuel, the preheat temperature of combustion gas improve, and its theoretical temperature combustion also improves, thereby causes NO
XGrowing amount large.
Summary of the invention
The object of the invention is to provide a kind of can significantly reduce NO
XThe Regenerative Ladle Baking system, to solve the NO of regenerative combustion system of the prior art
XPollutant discharge amount is large, causes with serious pollution technical matters.
The baking method of the Regenerative Ladle Baking system that another object of the present invention is to provide above-mentioned is to solve the NO of regenerative combustion system of the prior art
XPollutant discharge amount is large, causes with serious pollution technical matters.
The object of the invention is achieved through the following technical solutions:
A kind ofly can significantly reduce NO
XThe Regenerative Ladle Baking system, comprise ladle, at least two burners, combustion gas subsystem, combustion-supporting wind system, smoke evacuation subsystem, empty combustion gas reversal valve and RACSs, described burner is arranged on the clad of described ladle, described empty combustion gas reversal valve is connected with described burner, described combustion gas subsystem, described combustion-supporting wind system, described smoke evacuation subsystem and the RACS of being connected respectively, is provided with heat storage, at least one dense burning spout and at least one light burning spout in the described burner; During baking, carry out dense burning from the combustion gas of dense burning spout ejection, simultaneously, carry out light burning from the combustion gas of light burning spout ejection.
Preferably, described dense burning spout is a plurality of, and described light burning spout is a plurality of.
Preferably, described a plurality of dense burning spouts are arranged on the same level, and described a plurality of light burning spouts are arranged on the same level.
Preferably, described light burning spout is close to the more described dense burning spout of the air port of described burner, and described dense burning spout is arranged on the below of described light burning spout.
Preferably, the primary air ratio of the combustion gas of described dense burning spout ejection is less than 1.0, and the primary air ratio of the combustion gas of described light burning spout ejection is greater than 1.0.
Above-mentioned can significantly reduce NO
XThe baking method of Regenerative Ladle Baking system, may further comprise the steps:
(1) air and combustion gas enter in the first burner by empty combustion gas reversal valve respectively, after heat storage in the first burner carries out preheating, combustion gas sprays through light burning spout, entrainment a large amount of combustion airs and enter the mixed zone, mix to form the primary air fuel gas mixture, and enter the combustion zone and form light flame combustion; Simultaneously, behind the mixed zone, dense flame combustion is carried out in the combustion gas that enters the combustion zone and become auxiliary air and the ejection of dense burning spout from the air of empty combustion gas reversal valve; Simultaneously, the high-temperature flue gas of generation is discharged from the second burner, and the heat storage in the second burner absorbs the heat in the high-temperature flue gas, also reduces the temperature of the flue gas of discharging with the heat in the recovery high-temperature flue gas;
After heat storage in (2) second burners is fully heated, RACS commutates sky combustion gas reversal valve, air and combustion gas enter in the second burner by empty combustion gas reversal valve respectively, after heat storage in the second burner carries out preheating, combustion gas sprays through light burning spout, entrainment a large amount of combustion airs and enter the mixed zone, mix to form the primary air fuel gas mixture, and enter the combustion zone and form light flame combustion; Simultaneously, behind the mixed zone, dense flame combustion is carried out in the combustion gas that enters the combustion zone and become auxiliary air and the ejection of dense burning spout from the air of empty combustion gas reversal valve; Simultaneously, the high-temperature flue gas of generation is discharged from the first burner, and the heat storage in the first burner absorbs the heat in the high-temperature flue gas, also reduces the temperature of the flue gas of discharging with the heat in the recovery high-temperature flue gas.
Preferably, described dense burning spout is a plurality of, and described light burning spout is a plurality of.
Preferably, described a plurality of dense burning spouts are arranged on the same level, and described a plurality of light burning spouts are arranged on the same level.
Preferably, in the first burner and the second burner, described light burning spout is close to the more described dense burning spout of air port, and described dense burning spout is arranged on the below of described light burning spout.
Preferably, the primary air ratio of the combustion gas of described dense burning spout ejection is less than 1.0, and the primary air ratio of the combustion gas of described light burning spout ejection is greater than 1.0.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention combines the heat storage type combustion mode with Concentration-decentration Split Combustion, allow air and combustion gas spray into respectively burner hearth by spout separated by a distance, the oxidation reaction of fuel and air spreads all over whole burner hearth, visible flame and its distinctive high-temperature region of not having the traditional combustion mode to have, make the interior temperature of whole stove very even, suppressed NO
XThe generation of pollutant, maximum reduction amount can reach more than 70%, and this combustion system has thoroughly solved the high pollution problem that burning causes;
2, ladle preheating system energy of the present invention is so that furnace temperature is even, and eliminates localized hyperthermia, thereby improved heating process, can prolong the service life of ladle and burner;
3, the present invention adopts heat storage type combustion can greatly reduce exhaust gas temperature, by original being reduced to more than 1000 ℃ below 150 ℃, and can fully reclaim heat, and improve and produce and surrounding enviroment, reduced the thermal loss of flue gas, reduce productive labor intensity, and improved the combustion rate of burning, prolonged the service life of other equipment;
4, ladle preheating system of the present invention combines heat storage type combustion with Concentration-decentration Split Combustion, with behind air, the two high temperature that are preheating near fire box temperature of combustion gas, spray into again and carry out bias combustion in the burner hearth first, can under hypoxemia, burn rapidly, reaction spreads all over whole burner hearth, do not have the localized hyperthermia district, the ladle quick heating can be saved the natural gas resource in a large number, reduced cost, exhaust gas temperature has reduced about 900 ℃, presses the heater EQUILIBRIUM CALCULATION FOR PROCESS, can save at least 40% fuel.
Description of drawings
Fig. 1 is the principle schematic of ladle preheating system of the present invention;
Fig. 2 is the part-structure schematic diagram of burner of the present invention.
The specific embodiment
The combustion system that the present invention adopts heat storage type combustion to combine with Concentration-decentration Split Combustion, its energy savings and reduction NO
XThe principle of discharge capacity is as follows.
With regard to the heat storage type combustion mode, temperature is very even in the stove, fuel combustion is abundant, can greatly reduce exhaust gas temperature, by original being reduced to more than 1000 ℃ below 150 ℃, fully reclaim heat, and improve and produce and surrounding enviroment, reduce the thermal loss of flue gas, and improve the combustion rate of burning, but energy savings also can prolong service life of ladle.
With regard to Concentration-decentration Split Combustion, it reduces NO by reducing ignition temperature
XGrowing amount, thereby reduce NO
XDischarge capacity.It reduces ignition temperature from the reason of two aspects: being that excess air plays diluting effect on the one hand, is that the flue gas that light flame combustion produces has reducing effect to dense flame temperature on the other hand.Flame temperature after the burning depends on calorific value and the exhaust gas volumn of combustion gas.Under the constant prerequisite of exchangeability and supply, ignition temperature and exhaust gas volumn are inversely proportional to, and exhaust gas volumn is identical with the excess air variation tendency, and therefore, ignition temperature is opposite with the excess air variation tendency.For coal gas, when air coefficient increases to 1.8 from 1.0, its ignition temperature will drop to 1173K from 2316K, reduce closely 50%, and so significantly temperature reduces reducing NO
XThe impact of growing amount is huge.Particularly when temperature is lower than 1700K, NO
XIt is very little that growing amount becomes.For light flame, its air capacity has surpassed theoretical air requirement, and air coefficient tends to reach about 1.8, ignition temperature at this moment generally about 1200K, NO
XBe effectively controlled.Light flame is a kind of full premix combustion mode, dense flame is longer than full premix combustion flame, simultaneously because for each dense flame, the flue gas that light flame combustion generates has just caused that auxiliary air can not obtain rapidly in the combustion process, it is longer that flame becomes, flame elongates and has prolonged the burning heat release time, has slowed down heating speed, and flame temperature is descended, so that the ignition temperature reduction, thereby reduce NO
XGrowing amount.
Below in conjunction with accompanying drawing, describe the present invention in detail.
See also Fig. 1,2, of the present inventionly can significantly reduce NO
XThe Regenerative Ladle Baking system, comprise ladle 1, at least two burners 4, combustion gas subsystem 5, combustion-supporting wind system 7, smoke evacuation subsystem 6, empty combustion gas reversal valve 8 and RACS (not shown).In this example, two burners 4 are arranged on the clad 2 of ladle 1, and empty combustion gas reversal valve 8 is connected with burner 4, combustion gas subsystem 5, combustion-supporting wind system 7 and the subsystem 6 of being connected respectively by pipeline.Be provided with heat storage 3, at least one dense burning spout 43 and at least one light burning spout 42 in the burner 4; During baking, carry out dense burning from the combustion gas of dense burning spout 43 ejections, simultaneously, carry out light burning from the combustion gas of light burning spout 42 ejections.The controlled end of empty combustion gas reversal valve links to each other with the output of RACS, empty combustion gas reversal valve makes two burner sequence alternate ground on the clad be connected with air inlet system under the control of RACS, and controls the duty of two burners by empty combustion gas reversal valve.When the burner in left side is in fired state, the air heat storage of the burner on right side is in the accumulation of heat state, after empty combustion gas reversal valve commutation, can change the duty of two burners, the left side burner air heat storage place's accumulation of heat state the time, the burner place fired state on right side, by the continuous switch operating state of exchange system, the burner of the left and right sides can be heat transferred combustion air and the combustion gas in the flue gas of accumulating.
In this example, dense burning spout 43 is a plurality of, and light burning spout 42 is a plurality of.A plurality of dense burning spouts 43 are arranged on the same level, and a plurality of light burning spouts 42 are arranged on the same level.Light burning spout 42 is close to the air port 41 denseer burning spouts 43 of burner, and dense burning spout 43 is arranged on the below of light burning spout 42.Wherein, the primary air ratio of the combustion gas of dense burning spout 43 ejections is less than 1.0, and the primary air ratio of the combustion gas of light burning spout 42 ejections is greater than 1.0.
The present invention also provides above-mentioned can significantly reduce NO
XThe baking method of Regenerative Ladle Baking system, may further comprise the steps:
(1) air, the combustion gas from combustion-supporting wind system and combustion gas subsystem enters in the first burner by empty combustion gas reversal valve respectively, after heat storage in the first burner carries out preheating, combustion gas sprays through light burning spout with certain speed, entrainment a large amount of combustion airs and enter the mixed zone, mix to form the primary air fuel gas mixture, and enter the combustion zone and burn in the full premix combustion mode and form light flame combustion 12; Simultaneously, behind the mixed zone, dense flame combustion 11 is carried out in the combustion gas that enters the combustion zone and become auxiliary air and the ejection of dense burning spout from a certain amount of air of empty combustion gas reversal valve; Simultaneously, the high-temperature flue gas 13 of generation is discharged from the second burner, and the heat storage in the second burner absorbs the heat in the high-temperature flue gas, also reduces the temperature of the flue gas of discharging with the heat in the recovery high-temperature flue gas;
After heat storage in (2) second burners is fully heated, RACS is controlled empty combustion gas reversal valve automatically commutates sky combustion gas reversal valve, air, combustion gas from combustion-supporting wind system and combustion gas subsystem enter in the second burner by empty combustion gas reversal valve respectively, after heat storage in the second burner carries out preheating, combustion gas sprays through light burning spout with certain speed, entrainment a large amount of combustion airs and enter the mixed zone, mix to form the primary air fuel gas mixture, and enter the combustion zone and burn in the full premix combustion mode and form light flame combustion 12; Simultaneously, behind the mixed zone, dense flame combustion 11 is carried out in the combustion gas that enters the combustion zone and become auxiliary air and the ejection of dense burning spout from a certain amount of air of empty combustion gas reversal valve; Simultaneously, the high-temperature flue gas 13 of generation is discharged from the first burner, and the heat storage in the first burner absorbs the heat in the high-temperature flue gas, also reduces the temperature of the flue gas of discharging with the heat in the recovery high-temperature flue gas.
In this example, dense burning spout 43 is a plurality of, and light burning spout 42 is a plurality of.A plurality of dense burning spouts 43 are arranged on the same level, and a plurality of light burning spouts 42 are arranged on the same level.Light burning spout 42 is close to the air port 41 denseer burning spouts 43 of burner, and dense burning spout 43 is arranged on the below of light burning spout 42.Wherein, the primary air ratio of the combustion gas of dense burning spout 43 ejections is less than 1.0, and the primary air ratio of the combustion gas of light burning spout 42 ejections is greater than 1.0.
The present invention combines the heat storage type combustion mode with Concentration-decentration Split Combustion, allow air and combustion gas spray into respectively burner hearth by spout separated by a distance, the oxidation reaction of fuel and air spreads all over whole burner hearth, visible flame and its distinctive high-temperature region of not having the traditional combustion mode to have, make the interior temperature of whole stove very even, suppressed NO
XThe generation of pollutant, maximum reduction amount can reach more than 70%, and this combustion system has thoroughly solved the high pollution problem that burning causes.Ladle preheating system energy of the present invention is so that furnace temperature is even, and elimination localized hyperthermia, thereby has improved heating process, can prolong the service life of ladle and burner.The present invention adopts heat storage type combustion can greatly reduce exhaust gas temperature, by original being reduced to more than 1000 ℃ below 150 ℃, and can fully reclaim heat, and improve and produce and surrounding enviroment, reduced the thermal loss of flue gas, reduce productive labor intensity, and improved the combustion rate of burning, prolonged the service life of other equipment.Ladle preheating system of the present invention combines heat storage type combustion with Concentration-decentration Split Combustion, with behind air, the two high temperature that are preheating near fire box temperature of combustion gas, spray into again and carry out bias combustion in the burner hearth first, can under hypoxemia, burn rapidly, reaction spreads all over whole burner hearth, do not have the localized hyperthermia district, the ladle quick heating can be saved the natural gas resource in a large number, reduced cost, exhaust gas temperature has reduced about 900 ℃, presses the heater EQUILIBRIUM CALCULATION FOR PROCESS, can save at least 40% fuel.
Above disclosed only be several specific embodiments of the application, but the application is not limited thereto, the changes that any person skilled in the art can think of all should drop in the application's the protection domain.
Claims (10)
1. one kind can significantly be reduced NO
XThe Regenerative Ladle Baking system, it is characterized in that, comprise ladle, at least two burners, combustion gas subsystem, combustion-supporting wind system, smoke evacuation subsystem, empty combustion gas reversal valve and RACSs, described burner is arranged on the clad of described ladle, described empty combustion gas reversal valve is connected with described burner, described combustion gas subsystem, described combustion-supporting wind system, described smoke evacuation subsystem and the RACS of being connected respectively, is provided with heat storage, at least one dense burning spout and at least one light burning spout in the described burner; During baking, carry out dense burning from the combustion gas of dense burning spout ejection, simultaneously, carry out light burning from the combustion gas of light burning spout ejection.
2. as claimed in claim 1ly can significantly reduce NO
XThe Regenerative Ladle Baking system, it is characterized in that, described dense burning spout is a plurality of, described light burning spout is a plurality of.
3. as claimed in claim 2ly can significantly reduce NO
XThe Regenerative Ladle Baking system, it is characterized in that, described a plurality of dense burning spouts are arranged on the same level, described a plurality of light burning spouts are arranged on the same level.
4. can significantly reduce NO as any one among the claim 1-3 is described
XThe Regenerative Ladle Baking system, it is characterized in that, described light burning spout is close to the more described dense burning spout of the air port of described burner, described dense burning spout is arranged on the below of described light burning spout.
5. as claimed in claim 1ly can significantly reduce NO
XThe Regenerative Ladle Baking system, it is characterized in that, the primary air ratio of the combustion gas of described dense burning spout ejection is less than 1.0, the primary air ratio of the combustion gas of described light burning spout ejection is greater than 1.0.
6. as claimed in claim 1ly can significantly reduce NO
XThe baking method of Regenerative Ladle Baking system, it is characterized in that, may further comprise the steps:
(1) air and combustion gas enter in the first burner by empty combustion gas reversal valve respectively, after heat storage in the first burner carries out preheating, combustion gas sprays through light burning spout, entrainment a large amount of combustion airs and enter the mixed zone, mix to form the primary air fuel gas mixture, and enter the combustion zone and form light flame combustion; Simultaneously, behind the mixed zone, dense flame combustion is carried out in the combustion gas that enters the combustion zone and become auxiliary air and the ejection of dense burning spout from the air of empty combustion gas reversal valve; Simultaneously, the high-temperature flue gas of generation is discharged from the second burner, and the heat storage in the second burner absorbs the heat in the high-temperature flue gas, also reduces the temperature of the flue gas of discharging with the heat in the recovery high-temperature flue gas;
After heat storage in (2) second burners is fully heated, RACS commutates sky combustion gas reversal valve, air and combustion gas enter in the second burner by empty combustion gas reversal valve respectively, after heat storage in the second burner carries out preheating, combustion gas sprays through light burning spout, entrainment a large amount of combustion airs and enter the mixed zone, mix to form the primary air fuel gas mixture, and enter the combustion zone and form light flame combustion; Simultaneously, behind the mixed zone, dense flame combustion is carried out in the combustion gas that enters the combustion zone and become auxiliary air and the ejection of dense burning spout from the air of empty combustion gas reversal valve; Simultaneously, the high-temperature flue gas of generation is discharged from the first burner, and the heat storage in the first burner absorbs the heat in the high-temperature flue gas, also reduces the temperature of the flue gas of discharging with the heat in the recovery high-temperature flue gas.
7. as claimed in claim 6ly can significantly reduce NO
XThe baking method of Regenerative Ladle Baking system, it is characterized in that, described dense burning spout is a plurality of, described light burning spout is a plurality of.
8. as claimed in claim 7ly can significantly reduce NO
XThe baking method of Regenerative Ladle Baking system, it is characterized in that, described a plurality of dense burning spouts are arranged on the same level, described a plurality of light burning spouts are arranged on the same level.
9. can significantly reduce NO as any one among the claim 6-8 is described
XThe baking method of Regenerative Ladle Baking system, it is characterized in that, in the first burner and the second burner, described light burning spout is close to the more described dense burning spout of air port, described dense burning spout is arranged on the below of described light burning spout.
10. as claimed in claim 6ly can significantly reduce NO
XThe baking method of Regenerative Ladle Baking system, it is characterized in that, the primary air ratio of the combustion gas of described dense burning spout ejection is less than 1.0, the primary air ratio of the combustion gas of described light burning spout ejection is greater than 1.0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102680575A CN103350220A (en) | 2013-06-28 | 2013-06-28 | Heat accumulating type steel ladle baking system capable of remarkably reducing NOX (nitrogen oxide) and baking method |
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| CN2013102680575A CN103350220A (en) | 2013-06-28 | 2013-06-28 | Heat accumulating type steel ladle baking system capable of remarkably reducing NOX (nitrogen oxide) and baking method |
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| CN105903941A (en) * | 2016-06-01 | 2016-08-31 | 江苏永钢集团有限公司 | Online steel ladle roaster |
| CN106270470A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | A kind of ladle baking facilities and baking method |
| CN107552772A (en) * | 2016-06-30 | 2018-01-09 | 宝山钢铁股份有限公司 | The device for controlling dynamically and control method of continuous casting immersion outlet preheating |
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| CN107552772A (en) * | 2016-06-30 | 2018-01-09 | 宝山钢铁股份有限公司 | The device for controlling dynamically and control method of continuous casting immersion outlet preheating |
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Application publication date: 20131016 |