CN101792839B - Environment-friendly high temperature low oxygen hot blast furnace - Google Patents
Environment-friendly high temperature low oxygen hot blast furnace Download PDFInfo
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- CN101792839B CN101792839B CN2010101015330A CN201010101533A CN101792839B CN 101792839 B CN101792839 B CN 101792839B CN 2010101015330 A CN2010101015330 A CN 2010101015330A CN 201010101533 A CN201010101533 A CN 201010101533A CN 101792839 B CN101792839 B CN 101792839B
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Abstract
An environment-friendly high temperature low oxygen hot blast furnace belongs to the technical field of hot blast furnaces in the metallurgy industry. The invention comprises a hot blast furnace, shut-off valves, regulating valves, a gas flue for the hot blast furnace, a combustion air pipeline for the hot blast furnace, a gas flue for a combustion furnace, a combustion air fan for the combustion furnace, a combustion air pipeline for the combustion furnace, the combustion furnace, a high temperature flue for the combustion furnace, a gas mixing furnace, a gas mixing pipeline, a low temperature flue, a flue gas pressing machine, flues for the hot blast furnace, a low temperature preheating system, a gas main from a pipe network, a combustion air main and a combustion air fan for the hot blast furnace. The hot blast furnace has the following advantages: the hot blast furnace is suitable for different metallurgical technological processes, can be used in combination with various combustion air and gas low temperature preheating devices, fully recover the flue gas waste heat and further improve the heat efficiency, and realizes high blast temperature, high efficiency, environment friendliness and long life.
Description
Technical field
The invention belongs to metallurgy industry hotblast stove technical field, a kind of environment-friendly high temperature low oxygen hot blast furnace particularly is provided, be applicable to the hotblast stove that blast furnace ironmaking and fused reduction iron-smelting are used in the iron-smelting process.Also can be used for other need be heated to gaseous medium in the industrial technology field more than 1000 ℃.
Background technology
With existing nearly two one-hundred-year histories of hotblast stove heating air blast, heating back wind-warm syndrome has only 149 ℃ at first in blast furnace ironmaking.Along with continuous advancement in technology, wind-warm syndrome is the highest has at present reached 1350 ℃.Wind-warm syndrome improves, and can significantly reduce coke ratio, saves coke, improves furnace processor, also can make full use of low-calorie blast furnace gas, improves thermo-efficiency, reduces coal gas diffusion, save energy, protection environment.
Along with improving constantly of hot blast temperature, some problems also come out gradually, comparatively typically are exactly the boundary stress etching problem of hotblast stove high-temperature zone, and it has become high temperature hot-blast furnace and has improved wind-warm syndrome and long-lived bottleneck.
Under the hot conditions, N
2And O
2Resolve into monomeric N and O, N and O generate oxynitrides (NOx) again, and when the top temperature of vault surpassed 1400 ℃, the oxynitrides of generation increased sharply, and the water of condensation that is dissolved on the furnace shell forms the corrodibility acid solution.There is stress in corrosive fluid from furnace shell place is invaded along the lattice deep, the furnace shell metallic surface is cracked and expands and arrives and break and damage.Simultaneously because stove operation can produce pulse tensile stress slowly and fatigue stress, make tensile stress have above yield strength may, thereby promote the process of furnace shell corrosion failure.As seen, under the hot conditions, the generation of a large amount of oxynitride is boundary stress corrosive roots.
From the angle of environmental protection, the NOx in the atmosphere has great harm to HUMAN HEALTH and environment.NO
2Can influence respiratory system, cause diseases such as bronchitis and pulmonary emphysema; NO easily causes the blood anoxic and causes the nervus centralis paralysis.The photo-chemical smog that is caused by pollutents such as NOx has very big pungency and toxic action to human body, makes people's dizziness uncomfortable in chest, nausea and vomiting, and tetany even stupor are dead.After NOx and airborne water vapour meet, can reduce to ground with the form of acid rain, corrosion buildings and industrial equipments destroy cultural relics and historic sites, destroy soil constituent, make crop production reduction even death, and these all can cause enormous economic loss.Therefore, all there is strict restriction countries in the world to the discharging of NOx.
The NOx that combustion processes produces comprises NO, NO
2And N
2O, wherein NO accounts for more than 90%.The formation mechanism of NOx has three kinds, is respectively heating power type, fuel type and quick type.Concrete formation mechanism is relevant with the kind of fuel.The growing amount of NOx depends on fuel type mechanism during solid fuel ignition, and during the liquid fuel combustion of geseous fuel and low nitrogen content, the growing amount of NOx depends on heating power type mechanism.The fuel of hotblast stove is coal gas, and the generation that therefore suppresses heating power type NOx is the main path that reduces NOx quantity discharged in the combustion product gases.
The high-temperature and low-oxygen combustion technology is a kind of novel combustion technology that grows up at Japan, US and European the nineties.The characteristics of this technology are combustion air preheating temperature height, and oxygen level is low, burn with fuel under this operating mode, and combustion system is a diffusion combustion, do not have the localized hyperthermia district in the traditional combustion process, and NOx generates and is suppressed.The flame volume that burning produces under the high temperature oxygen deprivation condition is multiplied, the uniform relatively high severe radiation black matrix of formation temperature in the whole combustion space, and thermo-efficiency improves.
Last century the nineties, China begins the high-temperature and low-oxygen combustion technology is applied on the heater for rolling steel, is applied to ladle baking, soaking pit and other heat treatment furnaces afterwards again successively.Through ten years development, it is comparatively ripe that this technology has developed in fields such as process furnace, for enterprise has brought huge economic benefit and social benefit.
Summary of the invention
The object of the present invention is to provide a kind of environment-friendly high temperature low oxygen hot blast furnace, realize high wind-warm syndrome, efficient, environmental protection, longevity.This hotblast stove reduces the combustion air oxygen level by improving the combustion air preheating temperature, can effectively improve theoretical combustion temperature under the situation of single fire low-heat value gas (as blast furnace gas), controls the generation of oxynitride simultaneously.Like this, both make full use of low-quality coal gas, the stable wind-warm syndrome that provides more than 1250 ℃ of blast furnace had been provided again, effectively controlled the generation of oxynitride simultaneously, really realized high wind-warm syndrome, efficient, energy-saving and environmental protection and long-lived target.
Along with the continuous development of metallurgical technology, the melting and reducing technology that reaches its maturity is in the near future with the Steel Production Flow Chart based on blast furnace of overall restructuring routine.The present invention is as a kind of hotblast stove device that hot blast is provided, and adaptability is strong, can be used for ironmaking technique of fusion and reduction fully, for it provides hot blast more than 1000 ℃.
In traditional blast furnace iron-making process, blast furnace working condition difference is huge, comprises furnace volume, combustion intensity, hotblast stove form, hotblast stove working system, coal gas condition etc.Environment-friendly high temperature low oxygen hot blast furnace adaptability of the present invention is strong, and the hotblast stove form can be the hotblast stove of form of ownership at present such as top ignition, internal combustion type and external combustion type.At different blast furnace production requirement and working conditions, the flexible hot blast temperature is controlled the growing amount of oxynitride simultaneously, when satisfying the blast furnace production requirement, realizes efficient, environmental protection, long-lived target.
Hotblast stove of the present invention comprises following composition: hotblast stove, trip valve, variable valve, hotblast stove gas line, hotblast stove combustion air pipeline, roasting kiln gas line, roasting kiln burner blower, roasting kiln combustion air pipeline, roasting kiln, roasting kiln high-temperature flue, mix steam stove, gas mixing pipe road, low temperature flue, the flue gas press, hot-blast stove flue, low-temperature prewarming system, from the gas main of pipe network, combustion air house steward, hotblast stove burner blower.Hotblast stove, couples together hotblast stove and low-temperature prewarming system between hotblast stove and low-temperature prewarming system with the combustion air pipeline, is used for heat air delivery stove combustion air.Hotblast stove, couples together hotblast stove and low-temperature prewarming system between hotblast stove and low-temperature prewarming system with gas line, is used for heat air delivery stove coal gas.Roasting kiln is positioned at before the roasting kiln with the combustion air pipeline with burner blower, roasting kiln, for roasting kiln provides combustion air, roasting kiln, is delivered to coal gas in the roasting kiln with gas line from hotblast stove between hotblast stove is with gas line and roasting kiln with gas line.The roasting kiln high-temperature flue provides high-temperature flue gas for mixing steam stove between roasting kiln and mixed steam stove, low temperature flue and flue gas press provide low-temperature flue gas for mixing steam stove between hot-blast stove flue and mixed steam stove.The gas mixing pipe road is used between the combustion air pipeline at mixed steam stove and hotblast stove, and the flue gas that mixes is sent into hotblast stove with in the combustion air pipeline from mixing steam stove.Hot-blast stove flue is delivered to the low-temperature prewarming system with the flue gas that hotblast stove is discharged between hotblast stove and low-temperature prewarming system, discharge after the heat exchange.
Hotblast stove is provided with burner blower by hotblast stove with combustion air, after the low-temperature prewarming system warm-up, is mixed into the high-temperature low-oxygen combustion air with flue gas, enters hotblast stove through hotblast stove with combustion air pipeline, variable valve, trip valve and participates in burning.
The high-temperature flue gas that the roasting kiln burning produces enters mixed steam stove through the roasting kiln high-temperature flue, after the gas mixing pipe road enters hotblast stove combustion air pipeline, the temperature that makes combustion air is more than or equal to 800 ℃ with the low-temperature flue gas mixing, and the oxygen volume content is smaller or equal to 18%.
The flue gas that Combustion of Hot Air Furnace produces enters and mixes before the steam stove, utilizes the pressurization of flue gas press, enters mixed steam stove then.
During this hotblast stove was formed, the low-temperature prewarming system was an optional equipment.The low-temperature prewarming system whether selects for use, and the pre-heating system of selecting which kind of form for use can be selected according to practical situation flexibly to the not influence of this environment-friendly high temperature low oxygen hot blast furnace.Comparatively sophisticated at present low-temperature prewarming technology has tubular heat exchanger, plate-type heat exchanger, heat-pipe heat exchanger etc., can use jointly with hotblast stove of the present invention.Energy-conserving and environment-protective are China's fundamental state policies of present stage, therefore should make full use of low-temperature prewarming system recoveries fume afterheat.
Low-heat value gas from gaspipe network enters the low-temperature prewarming system through gas main, is preheated to about 200 ℃, and through the hotblast stove gas line, variable valve, trip valve enters hotblast stove and burns.
The combustion air house steward couples together hotblast stove with burner blower and low-temperature prewarming system, hotblast stove with combustion air through about low-temperature prewarming system warm-up to 200 ℃, mix mutually with flue gas from the gas mixing pipe road, more than or equal to 800 ℃, the volume percent of oxygen is smaller or equal to 18% with combustion air temperature for mixed hotblast stove.Mixed hotblast stove uses combustion air through hotblast stove combustion air pipeline, variable valve, and trip valve enters hotblast stove, reacts with low-heat value gas, shows as high-temperature and low-oxygen combustion, for regenerator provides heat.
The high-temperature flue gas that Combustion of Hot Air Furnace produces is discharged from hot-blast stove flue after the regenerator heat exchange.Because hotblast stove is periodic duty, so flue gas fluctuates in certain temperature range, and medial temperature is about 300 ℃.Be connected by hot-blast stove flue between hotblast stove and the low-temperature prewarming system, hot-blast stove fume enters hot-blast stove flue through trip valve, through low-temperature prewarming system heat exchange rear section flue gas through the flue gas press, variable valve, trip valve, low temperature flue enters mixed steam stove, is used to regulate and hotblast stove total exhaust gas volumn and the flue-gas temperature of combustion air blended, and all the other flue gases are drained or used for other user.
Roasting kiln provides the device of high-temperature flue gas, and it is positioned at mixes before the steam stove, and is connected by the roasting kiln high-temperature flue between the mixed steam stove.Its used fuel be and hotblast stove with coal gas identical low-heat value gas, can simplify technical process like this, reduce investment outlay, energy-saving and cost-reducing.Draw the roasting kiln gas line from the gas main of hotblast stove, coal gas is sent into the roasting kiln burning through variable valve, trip valve.The used combustion air of roasting kiln is provided with burner blower by roasting kiln, and through roasting kiln combustion air pipeline, variable valve, trip valve enter roasting kiln and participate in burning.
The temperature of the high-temperature flue gas that roasting kiln produces is more than or equal to 1000 ℃, and through the roasting kiln high-temperature flue, variable valve, trip valve enter mixed steam stove.
Mixed steam stove is a kind of mixing device, it with roasting kiln between be connected by the roasting kiln high-temperature flue, it with hotblast stove with being connected by the gas mixing pipe road between the combustion air pipeline, it with hot-blast stove flue between be connected by low temperature flue.Its effect is the high-temperature flue gas of auto-combustion stove in the future and low-temperature flue gas from hotblast stove mixes, and obtains the flue gas that parameters such as exhaust gas volumn, temperature meet the demands.Mixed flue gas is through variable valve, trip valve, the gas mixing pipe road enters hotblast stove combustion air pipeline, mix with combustion air with hotblast stove, obtain temperature more than or equal to 800 ℃, the volume percent of oxygen is smaller or equal to 18% combustion air, and concrete hotblast stove can be determined according to specific requirement with parameters such as the temperature of combustion air, oxygen volume percent.
Hotblast stove is the final user of low-heat value gas and high-temperature low-oxygen combustion air in the patent of the present invention.The form of hotblast stove can be top ignition, internal combustion type, external combustion type etc., also can be pebble stove.Burner in the hotblast stove can be premixed type burner or spreading combustion burner.The high-temperature and low-oxygen combustion reaction takes place in low-heat value gas and high-temperature low-oxygen combustion air in hotblast stove, whole Combustion of Hot Air Furnace room temp is even, generates uniform high-temperature flue gas flow field accordingly.Owing to eliminated the localized hyperthermia district, therefore can effectively suppress the growing amount of oxynitride, both having stablized provides high-temperature hot-air, has controlled the generation of pollutents such as oxynitride again.
Hotblast stove is higher with the preheating temperature of combustion air, or needs preheating temperature and the oxygen content of more accurate control hotblast stove with combustion air, can increase high temperature preheating system, high temperature preheating flue, high temperature preheating rear pass on the basis of above-mentioned composition.Hotblast stove couples together hotblast stove, high temperature preheating system, the three of low-temperature prewarming system with the combustion air pipeline, is used for heat air delivery stove combustion air.Hotblast stove, couples together hotblast stove and low-temperature prewarming system between hotblast stove and low-temperature prewarming system with gas line, is used for heat air delivery stove coal gas.Roasting kiln is positioned at before the roasting kiln with the combustion air pipeline with burner blower, roasting kiln, for roasting kiln provides combustion air, roasting kiln, is delivered to coal gas in the roasting kiln with gas line from hotblast stove between hotblast stove is with gas line and roasting kiln with gas line.The roasting kiln high-temperature flue provides high-temperature flue gas for mixing steam stove between roasting kiln and mixed steam stove, low temperature flue and flue gas press provide low-temperature flue gas for mixing steam stove between hot-blast stove flue and mixed steam stove.The gas mixing pipe road is used between the combustion air pipeline at mixed steam stove and hotblast stove, and the flue gas that mixes is sent into hotblast stove with in the combustion air pipeline from mixing steam stove.High temperature preheating, is used for the part high-temperature flue gas that mixes is sent into the high temperature preheating system with flue between gas mixing pipe road and high temperature preheating system.The high temperature preheating rear pass is sent into the flue gas after the heat exchange in the hot-blast stove flue between high temperature preheating system and hot-blast stove flue.Hot-blast stove flue is delivered to the low-temperature prewarming system with the flue gas that hotblast stove is discharged between hotblast stove and low-temperature prewarming system, discharge after the heat exchange.
Hotblast stove is provided with burner blower by hotblast stove with combustion air, after the low-temperature prewarming system warm-up, through the high temperature preheating system warm-up, be mixed into the high-temperature low-oxygen combustion air with flue gas then again, enter hotblast stove through hotblast stove with combustion air pipeline, variable valve, trip valve and participate in burning.
The high-temperature flue gas that the roasting kiln burning produces enters mixed steam stove through the roasting kiln high-temperature flue, enter hotblast stove combustion air pipeline through the gas mixing pipe road with low-temperature flue gas mixing rear section, part enters the high temperature preheating system through high temperature preheating with flue, more than the warm-up combustion-supporting air to 500 ℃, heat release is after the high temperature preheating rear pass enters hot-blast stove flue.Sneak into combustion air by high temperature preheating with flue gas, the temperature that makes combustion air is more than or equal to 800 ℃, and the oxygen volume content is smaller or equal to 18%.
During hotblast stove after the increase high temperature preheating system was formed, the low-temperature prewarming system also was an optional equipment.
Low-heat value gas from gaspipe network enters the low-temperature prewarming system through gas main, is preheated to about 200 ℃, and through the hotblast stove gas line, variable valve, trip valve enters hotblast stove and burns.
After increasing the high temperature preheating system, hotblast stove is connecting high temperature preheating system and hotblast stove with the combustion air pipeline, and the hotblast stove combustion air through about low-temperature prewarming system warm-up to 200 ℃ is again more than high temperature preheating system warm-up to 500 ℃.Hotblast stove mixes with flue gas from the gas mixing pipe road mutually with combustion air, and more than or equal to 800 ℃, the volume percent of oxygen is smaller or equal to 18% with combustion air temperature for mixed hotblast stove.Mixed hotblast stove uses combustion air through hotblast stove combustion air pipeline, variable valve, and trip valve enters hotblast stove, reacts with low-heat value gas, shows as high-temperature and low-oxygen combustion, for regenerator provides heat.
The high-temperature flue gas that Combustion of Hot Air Furnace produces is discharged from hot-blast stove flue after the regenerator heat exchange, and the flue gas medial temperature is about 300 ℃.Be connected by hot-blast stove flue between hotblast stove and the low-temperature prewarming system, hot-blast stove fume enters hot-blast stove flue through trip valve, through low-temperature prewarming system heat exchange rear section flue gas through the flue gas press, variable valve, trip valve, low temperature flue enters mixed steam stove, is used to regulate and hotblast stove total exhaust gas volumn and the flue-gas temperature of combustion air blended.The residue flue gas is drained or is used for other user.
After increasing the high temperature preheating system, the high temperature preheating system connects with the combustion air pipeline by hotblast stove between low-temperature prewarming system and hotblast stove.High temperature preheating is connecting mixed steam stove and high temperature preheating system with flue, and the high temperature preheating rear pass is connecting high temperature preheating system and hot-blast stove flue.The high-temperature flue gas that roasting kiln produces enters mixed steam stove, mix steam stove and produce the mixed flue gas that meets the demands, the flue gas after partially mixed is through variable valve, trip valve, high temperature preheating enters the high temperature preheating system with flue and carries out heat exchange, is used for hotblast stove is preheated to more than 500 ℃ with combustion air.Remain mixed flue gas through variable valve, trip valve, the gas mixing pipe road enters hotblast stove combustion air pipeline, mix with combustion air with hotblast stove, obtain temperature more than or equal to 800 ℃, the volume percent of oxygen is smaller or equal to 18% combustion air, and concrete hotblast stove can be determined according to specific requirement with parameters such as the temperature of combustion air, oxygen volume percent.Flue-gas temperature through the high temperature preheating system is reduced to about 300 ℃, and through trip valve, the high temperature preheating rear pass enters hot-blast stove flue, drains with hot-blast stove fume.
After increasing the high temperature preheating system, hotblast stove remains the final user of low-heat value gas and high-temperature low-oxygen combustion air.The form of hotblast stove can be top ignition, internal combustion type, external combustion type etc., also can be pebble stove.Burner in the hotblast stove can be premixed type burner or spreading combustion burner.The high-temperature and low-oxygen combustion reaction takes place in low-heat value gas and high-temperature low-oxygen combustion air in hotblast stove, whole Combustion of Hot Air Furnace room temp is even, the corresponding uniform high-temperature flue gas flow field that generates, eliminated the localized hyperthermia district, both having stablized provides high-temperature hot-air, has controlled the generation of pollutents such as oxynitride again.
In actual applications, because the difference of iron-smelting process, as blast furnace ironmaking, fused reduction iron-smelting etc., operating mode is also inequality.In traditional blast furnace iron-making process, because factors such as furnace volume, combustion intensity, technical process, working system, coal gas condition vary, the hot blast temperature that hotblast stove is produced requires also fully different with air quantity.In addition, the hotblast stove form that different engineerings are selected for use also is not quite similar, and comprises the hotblast stove of forms such as top ignition, internal combustion type, external combustion type and ball formula.The characteristics of environment-friendly high temperature low oxygen hot blast furnace of the present invention are exactly: by the isoparametric accurate control of growing amount, temperature, oxygen level of high-temperature flue gas that roasting kiln is produced, can accurately control with the preheating temperature and the oxygen content of combustion air hotblast stove, under the situation of single fire low-heat value gas, continous-stable provide temperature more than or equal to 1250 ℃ hot blast for blast furnace, and can carry out quick adjustment according to the condition of production at any time, when guaranteeing high wind-warm syndrome, the oxygen level of combustion air is controlled in strictness, thereby effectively controls the growing amount of oxynitride.Because environmental protection high temperature low oxygen hot blast furnace of the present invention to the form of concrete hotblast stove without limits, so this hotblast stove is not only applicable to newly-built engineerings such as blast furnace ironmaking, is applicable to improvement projects such as blast furnace overhaul fully yet.
In sum, the major advantage of environment-friendly high temperature low oxygen hot blast furnace of the present invention comprises:
1) is applicable to different metallurgical technology flow processs, comprises blast furnace iron-making process, ironmaking technique of fusion and reduction etc.;
2) can both flexible adaptation to the heat size of different blast furnaces, combustion intensity, technical process, working system, coal gas condition etc., applied widely;
3) be not subjected to the restriction of hotblast stove specific form, can with existing various forms of hotblast stove flexible combination;
4) be not only applicable to new project, also be applicable to the overhauling reform engineering;
5) accurately control by burning, realize preheating temperature and the oxygen content isoparametric accurate control of hotblast stove, and then realize the high-temperature and low-oxygen combustion that hotblast stove is interior with combustion air to roasting kiln;
6) under the situation of single fire low-heat value gas, can be the stable temperature that provides of user more than or equal to 1250 ℃ high-temperature hot-air;
7) combustion system of high-temperature low-oxygen has been eliminated the localized hyperthermia district, and the flue-gas temperature field is more even, has simultaneously effectively suppressed the generation and the discharging of pollution such as NOx and nuisance, helps protecting environment;
8) can be used in combination with the low-temperature prewarming device of various combustion airs and coal gas, fully reclaim fume afterheat, further improve the thermo-efficiency of this hotblast stove.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.Wherein, hotblast stove 1, trip valve 2, variable valve 3, hotblast stove gas line 4, hotblast stove combustion air pipeline 5, roasting kiln gas line 6, roasting kiln burner blower 7, roasting kiln combustion air pipeline 8, roasting kiln 9, roasting kiln high-temperature flue 10, mixed steam stove 11, gas mixing pipe road 12, low temperature flue 13, flue gas press 14, hot-blast stove flue 15, low-temperature prewarming system 16, gas main 17, combustion air house steward 18, hotblast stove burner blower 19 from pipe network.
Fig. 2 is an another kind of structural representation of the present invention.Wherein, hotblast stove 1, trip valve 2, variable valve 3, hotblast stove gas line 4, hotblast stove combustion air pipeline 5, roasting kiln gas line 6, roasting kiln burner blower 7, roasting kiln combustion air pipeline 8, roasting kiln 9, roasting kiln high-temperature flue 10, mix steam stove 11, gas mixing pipe road 12, low temperature flue 13, flue gas press 14, hot-blast stove flue 15, low-temperature prewarming system 16, gas main 17 from pipe network, combustion air house steward 18, hotblast stove burner blower 19, high temperature preheating system 20, high temperature preheating flue 21, high temperature preheating rear pass 22.
Embodiment
Fig. 1 and Fig. 2 are respectively specific implementation of the present invention
As shown in Figure 1, environment-friendly high temperature low oxygen hot blast furnace of the present invention comprises: hotblast stove 1, trip valve 2, variable valve 3, hotblast stove gas line 4, hotblast stove combustion air pipeline 5, roasting kiln gas line 6, roasting kiln burner blower 7, roasting kiln combustion air pipeline 8, roasting kiln 9, roasting kiln high-temperature flue 10, mixed steam stove 11, gas mixing pipe road 12, low temperature flue 13, flue gas press 14, hot-blast stove flue 15, low-temperature prewarming system 16, the gas main 17 from pipe network, combustion air house steward 18, hotblast stove burner blower 19.
Enter low-temperature prewarming system 16 from the low-heat value gas of gaspipe network through gas main 17 from pipe network, with about gas preheating to 200 ℃, through hotblast stove with gas line 4, variable valve 3, trip valve 2 enters hotblast stove 1 and burns.
Hotblast stove is provided with burner blower 19 by hotblast stove with combustion air, enters low-temperature prewarming system 16 behind combustion air house steward 18, is preheated to about 200 ℃.Hotblast stove mixes with flue gas from gas mixing pipe road 12 mutually with combustion air, and more than or equal to 800 ℃, the volume percent of oxygen is smaller or equal to 18% with combustion air temperature for mixed hotblast stove.Mixed hotblast stove uses combustion air through hotblast stove combustion air pipeline 5, variable valve 3, and trip valve 2 enters hotblast stove 1, reacts with low-heat value gas, shows as high-temperature and low-oxygen combustion, for regenerator provides heat.
The high-temperature flue gas that hotblast stove 1 burning produces is discharged from hot-blast stove flue 15 after the regenerator heat exchange.Because hotblast stove 1 is periodic duty, so flue gas fluctuates in certain temperature range, and medial temperature is about 300 ℃.Hot-blast stove fume enters hot-blast stove flue 15 through trip valve 2, through low-temperature prewarming system heat exchange rear section flue gas through flue gas press 14, variable valve 3, trip valve 2, low temperature flue 13 enters mixes steam stove 11, is used to regulate and hotblast stove total exhaust gas volumn and the flue-gas temperature of combustion air blended.The residue flue gas is drained or is used for other user.
Roasting kiln 9 provides the device of high-temperature flue gas.Its used fuel be and hotblast stove with coal gas identical low-heat value gas, can simplify technical process like this, reduce investment outlay, energy-saving and cost-reducing.Draw roasting kiln with gas line 6 from the gas line of hotblast stove 1, coal gas is sent into roasting kiln 9 burnings through variable valve 3, trip valve 2.The used combustion air of roasting kiln is provided with burner blower 7 by roasting kiln, and through roasting kiln combustion air pipeline 8, variable valve 3, trip valve 2 enter roasting kiln 9 and participate in burning.
The temperature of the high-temperature flue gas that roasting kiln 9 produces is more than or equal to 1000 ℃, and through roasting kiln high-temperature flue 10, variable valve 3, trip valve 2 enter and mix steam stove 11.
The high-temperature flue gas of mixed steam stove 11 stoves of auto-combustion in the future 9 mixes with the low-temperature flue gas from hotblast stove 1, obtains the flue gas that parameters such as exhaust gas volumn, temperature meet the demands.Mixed flue gas is through variable valve 3, trip valve 2, gas mixing pipe road 12 enters hotblast stove combustion air pipeline 5, mix with combustion air with hotblast stove, obtain temperature more than or equal to 800 ℃, the volume percent of oxygen is smaller or equal to 18% combustion air, through hotblast stove combustion air pipeline 5, variable valve 3, trip valve 2 enters hotblast stove 1, carries out high-temperature and low-oxygen combustion with low-heat value gas.
Hotblast stove 1 is the final user of low-heat value gas and high-temperature low-oxygen combustion air in the patent of the present invention.The form of hotblast stove 1 can be top ignition, internal combustion type, external combustion type etc., also can be pebble stove.Burner in the hotblast stove 1 can be premixed type burner or spreading combustion burner.The high-temperature and low-oxygen combustion reaction takes place in low-heat value gas and high-temperature low-oxygen combustion air in hotblast stove, whole Combustion of Hot Air Furnace room temp is even, generates uniform high-temperature flue gas flow field accordingly.Owing to eliminated the localized hyperthermia district, therefore can effectively suppress the growing amount of oxynitride, both having stablized provides high wind-warm syndrome, has controlled the generation of pollutents such as oxynitride again.
Environment-friendly high temperature low oxygen hot blast furnace of the present invention is applicable to metallurgy and field of energy-saving technology, and to various metallurgical technology flow processs, various operating modes can both flexible adaptation; Can be used in combination with various forms of hotblast stoves; Be not only applicable to new project, can satisfy the overhauling reform project demand yet; Use low-heat value gas that the high wind-warm syndrome that provides more than 1250 ℃ can be provided; Can effectively control the generation of pollutent; Use with various low-temperature prewarming system in combination, can further improve thermo-efficiency.
Claims (7)
1. an environment-friendly high temperature low oxygen hot blast furnace comprises: hotblast stove, trip valve, variable valve, hotblast stove gas line, hotblast stove combustion air pipeline, roasting kiln gas line, roasting kiln burner blower, roasting kiln combustion air pipeline, roasting kiln, roasting kiln high-temperature flue, mix steam stove, gas mixing pipe road, low temperature flue, the flue gas press, hot-blast stove flue, low-temperature prewarming system, from the gas main of pipe network, combustion air house steward, hotblast stove burner blower; It is characterized in that hotblast stove, couples together hotblast stove and low-temperature prewarming system with the combustion air pipeline, is used for heat air delivery stove combustion air between hotblast stove and low-temperature prewarming system; Hotblast stove, couples together hotblast stove and low-temperature prewarming system between hotblast stove and low-temperature prewarming system with gas line, is used for heat air delivery stove coal gas; Roasting kiln is positioned at before the roasting kiln with the combustion air pipeline with burner blower, roasting kiln, for roasting kiln provides combustion air; Roasting kiln, is delivered to coal gas in the roasting kiln with gas line from hotblast stove between hotblast stove is with gas line and roasting kiln with gas line; The roasting kiln high-temperature flue provides high-temperature flue gas for mixing steam stove between roasting kiln and mixed steam stove, low temperature flue and flue gas press provide low-temperature flue gas for mixing steam stove between hot-blast stove flue and mixed steam stove; The gas mixing pipe road is used between the combustion air pipeline at mixed steam stove and hotblast stove, and the flue gas that mixes is sent into hotblast stove with in the combustion air pipeline from mixing steam stove; Hot-blast stove flue is delivered to the low-temperature prewarming system with the flue gas that hotblast stove is discharged between hotblast stove and low-temperature prewarming system, discharge after the heat exchange.
2. hotblast stove according to claim 1 is characterized in that, increases the high temperature preheating system, the high temperature preheating flue, the high temperature preheating rear pass carries out high temperature preheating to hotblast stove with combustion air, in a wider context the oxygen level and the preheating temperature of combustion air is controlled; Hotblast stove couples together hotblast stove, high temperature preheating system, the three of low-temperature prewarming system with the combustion air pipeline, is used for heat air delivery stove combustion air, and the high temperature preheating system is between low-temperature prewarming system and hotblast stove; High temperature preheating, is used for the part high-temperature flue gas that mixes is sent into the high temperature preheating system with flue between gas mixing pipe road and high temperature preheating system; The high temperature preheating rear pass is sent into the flue gas after the heat exchange in the hot-blast stove flue between high temperature preheating system and hot-blast stove flue.
3. hotblast stove according to claim 2, it is characterized in that, hotblast stove is provided with burner blower by hotblast stove with combustion air, after the low-temperature prewarming system warm-up, again through the high temperature preheating system warm-up, be mixed into the high-temperature low-oxygen combustion air with flue gas then, enter hotblast stove through hotblast stove with combustion air pipeline, variable valve, trip valve and participate in burning.
4. hotblast stove according to claim 2, it is characterized in that, the high-temperature flue gas that the roasting kiln burning produces enters mixed steam stove through the roasting kiln high-temperature flue, enter hotblast stove combustion air pipeline through the gas mixing pipe road with low-temperature flue gas mixing rear section, part enters the high temperature preheating system through high temperature preheating with flue, more than the warm-up combustion-supporting air to 500 ℃, heat release is after the high temperature preheating rear pass enters hot-blast stove flue; Sneak into combustion air by high temperature preheating with flue gas, the temperature that makes combustion air is more than or equal to 800 ℃, and the oxygen volume content is smaller or equal to 18%.
5. hotblast stove according to claim 1, it is characterized in that, hotblast stove is provided with burner blower by hotblast stove with combustion air, after the low-temperature prewarming system warm-up, be mixed into the high-temperature low-oxygen combustion air with flue gas, enter hotblast stove through hotblast stove with combustion air pipeline, variable valve, trip valve and participate in burning.
6. hotblast stove according to claim 1, it is characterized in that, the high-temperature flue gas that the roasting kiln burning produces enters mixed steam stove through the roasting kiln high-temperature flue, with the low-temperature flue gas mixing after the gas mixing pipe road enters hotblast stove combustion air pipeline, the temperature that makes combustion air is more than or equal to 800 ℃, and the oxygen volume content is smaller or equal to 18%.
7. hotblast stove according to claim 1 is characterized in that, the flue gas that Combustion of Hot Air Furnace produces enters and mixes before the steam stove, utilizes the pressurization of flue gas press, enters mixed steam stove then.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101015330A CN101792839B (en) | 2010-01-26 | 2010-01-26 | Environment-friendly high temperature low oxygen hot blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101015330A CN101792839B (en) | 2010-01-26 | 2010-01-26 | Environment-friendly high temperature low oxygen hot blast furnace |
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| CN101792839A CN101792839A (en) | 2010-08-04 |
| CN101792839B true CN101792839B (en) | 2011-08-31 |
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| CN2010101015330A Active CN101792839B (en) | 2010-01-26 | 2010-01-26 | Environment-friendly high temperature low oxygen hot blast furnace |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485710A (en) * | 2014-10-09 | 2016-04-13 | 中国石油化工股份有限公司 | Air preheating method for waste sulfuric acid splitting process |
| CN105238899B (en) * | 2015-09-30 | 2017-11-21 | 北京首钢国际工程技术有限公司 | Efficient low-discharging high temperature low oxygen hot blast furnace |
| CN105238901B (en) * | 2015-09-30 | 2017-12-29 | 北京首钢国际工程技术有限公司 | A kind of multiduty hot-blast stove high temperature preheating system |
| CN106011354A (en) * | 2016-08-02 | 2016-10-12 | 芜湖新兴铸管有限责任公司 | Combustion air main pipe for blast-furnace hot blast stove |
| CN109357413A (en) * | 2018-12-05 | 2019-02-19 | 江苏恒创软件有限公司 | A kind of hot-blast stove control device that flue gas flow equalizing can be carried out to layering high/low temperature flue |
| CN111961781B (en) * | 2020-09-09 | 2022-05-17 | 鞍钢股份有限公司 | Recycling method of surplus metallurgical gas |
| CN115491452B (en) * | 2022-08-30 | 2023-09-26 | 鞍钢股份有限公司 | Production method for reducing emission concentration of nitrogen oxides in flue gas of blast furnace hot blast stove |
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