CN105238899A - Efficient low-emission high-temperature low-oxygen hot blast stove - Google Patents
Efficient low-emission high-temperature low-oxygen hot blast stove Download PDFInfo
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Abstract
The invention discloses an efficient low-emission high-temperature low-oxygen hot blast stove and belongs to the technical field of hot blast stoves in the metallurgical industry. The efficient low-emission high-temperature low-oxygen hot blast stove comprises a hot blast stove body, a stop valve, a regulating valve, a gas pipeline for the hot blast stove body, a combustion-supporting air pipeline for the hot blast stove body, a high-temperature mixed gas flue, a low-temperature flue, a low-temperature preheating system, a gas header pipe from a pipe network, a combustion-supporting air header pipe, a combustion-supporting blower for the hot blast stove body, a heat exchanged flue, a high-temperature flue, a high-temperature preheated flue, a combustion-supporting air by-pass pipeline, a combustion-supporting air low-temperature preheating pipeline and a combustion-supporting air high-temperature preheating pipeline. The efficient low-emission high-temperature low-oxygen hot blast stove has the advantages that when only blast stove gas is burnt, high-temperature hot-blast air with the temperature being above 1250 DEG C can be stably provided for users; the generation of NOx is effectively controlled; the high-temperature low-oxygen combustion is achieved; the efficient low-emission high-temperature low-oxygen hot blast stove is suitable for different metallurgical technological processes, and capable of being flexibly combined with existing hot blast stoves, being used for new projects and overhaul modification projects, and being combined with various low-temperature preheating devices of combustion-supporting air and gases for use; the exhaust gas afterheat is fully recovered; the heat efficiency is improved; the high blast temperature, high efficiency, low consumption, low content of NOx and long service life are achieved.
Description
Technical field
The invention belongs to metallurgy industry hotblast stove technical field, in particular, provide a kind of efficient low-discharging high temperature low oxygen hot blast furnace, be applicable to the hotblast stove that in iron-smelting process, blast furnace ironmaking and fused reduction iron-smelting are used.Also can be used for other to need gaseous medium to be heated in the industrial technical field of more than 1000 DEG C.
Background technology
In blast furnace ironmaking, have nearly two one-hundred-year histories with hotblast stove heat blowing, after heating, wind-warm syndrome only has 149 DEG C at first.Along with the continuous progress of technology, current wind-warm syndrome is the highest has reached 1350 DEG C.Wind-warm syndrome improves, and significantly can 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 of the environment.
Along with improving constantly of hot blast temperature, some problems also come out gradually, are exactly comparatively typically 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 hot conditions, N
2and O
2resolve into N and O of monomer, N and O generates again oxynitrides (NOx), and when the top temperature of vault is more than 1400 DEG C, the oxynitrides of generation increases sharply, and the water of condensation be dissolved on furnace shell forms corrodibility acid solution.Corrosive fluid exists stress place from furnace shell invades along lattice deep, furnace shell metallic surface is cracked and expands and arrive and break and damage.Meanwhile, because stove operation can produce pulse tensile stress slowly and fatigue stress, tensile stress there is is exceed the possibility of yield strength, thus promote the process of furnace shell corrosion failure.Visible, under hot conditions, the generation of a large amount of oxynitride is the root of boundary stress corrosion.
NOx in air has great harm to HUMAN HEALTH and environment.NO
2can respiratory system be affected, cause the disease such as bronchitis and pulmonary emphysema; NO easily causes blood anoxic and causes nervus centralis paralysis.The photo-chemical smog caused by the pollutent such as NOx has very large pungency and toxic action to human body, makes people's dizziness uncomfortable in chest, nausea and vomiting, and tetany is even gone into a coma death.After water vapour in NOx and air meets, can be down to ground with the form of acid rain, corrosion buildings and industrial equipments, destroy cultural relics and historic sites, spoiled soil composition, make crop production reduction even dead, these all can cause huge financial loss.Therefore, all there is strict restriction countries in the world to the discharge 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 heating power type, fuel type and Quick-type respectively.Concrete formation mechanism is relevant with the kind of fuel.During solid fuel ignition, the growing amount of NOx depends on fuel type mechanism, 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, therefore suppresses the generation of thermal NO x to be the main path reducing NOx discharge in combustion product gases.
Temperature Low Oxygen Combustion Technology is a kind of New combustion technique grown up at Japan, US and European the nineties.The feature of this technology is that combustion air preheating temperature is high, and oxygen level is low, burns under this operating mode with fuel, and combustion system is diffusion combustion, does not have the district of localized hyperthermia in traditional combustion process, and NOx generates and is suppressed.The flame volume produced that burns under high temperature oxygen lean conditions is multiplied, the high severe radiation black matrix that in whole combustion space, formation temperature is relatively uniform, and thermo-efficiency improves.
Last century the nineties, China starts Temperature Low Oxygen Combustion Technology to be applied on heater for rolling steel, is applied to ladle baking successively again afterwards, soaking pit and other heat treatment furnaces.Through the development of more than ten years, it is comparatively ripe that this technology has developed in fields such as process furnace, for enterprise brings huge economic benefit and social benefit.
Summary of the invention
The object of the present invention is to provide a kind of efficient low-discharging high temperature low oxygen hot blast furnace, achieve high wind-warm syndrome, efficient, low consumption, low NOx drainage, longevity.This hotblast stove, by improving combustion air preheating temperature, reduces combustion air oxygen level, when single fire low-heat value gas (as blast furnace gas), effectively can improve theoretical combustion temperature, control the generation of oxynitride simultaneously.Like this, both take full advantage of low-quality coal gas, and can be again blast furnace and stablize the wind-warm syndrome providing more than 1250 DEG C, effectively controlled the generation of oxynitride simultaneously, really realize high wind-warm syndrome, efficient, low consumption, low NOx drainage, long-lived target.
Along with the development of metallurgical technology, the smelting reduction technology reached its maturity is in the near future by the Steel Production Flow Chart based on blast furnace of overall restructuring routine.The present invention is as a kind of hotblast stove device providing hot blast, and strong adaptability, may be used for ironmaking technique of fusion and reduction completely, for it provides the hot blast of more than 1000 DEG C.
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 strong adaptability of the present invention, hotblast stove form can be the hotblast stove of the current form of ownership such as top ignition, internal combustion type and external combustion type.Require and working conditions for different blast fumance, flexible hot blast temperature, controls the growing amount of oxynitride simultaneously, while meeting blast fumance requirement, realizes efficient, environmental protection, long-lived target.
Hotblast stove of the present invention comprises hotblast stove 1, trip valve 2, variable valve 3, hotblast stove gas line 4, hotblast stove comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, combustion air low-temperature prewarming pipeline 17.
Hotblast stove with comburent air duct 5 between hotblast stove 1 and combustion air low-temperature prewarming pipeline 17, by hotblast stove 1 and combustion air low-temperature prewarming pipeline 1) couple together, for heat air delivery stove combustion air.Hotblast stove comburent air duct 5 and low-temperature preheating system 8, couple together, for the combustion air after transporting low temperature preheating with between comburent air duct 5 and low-temperature preheating system 8 at hotblast stove by combustion air low-temperature prewarming pipeline 17.Hotblast stove 1 and low-temperature preheating system 8, couple together with gas line 4 by hotblast stove between hotblast stove 1 and low-temperature preheating system 8, for carrying the hotblast stove coal gas after preheating.The flue gas that hotblast stove 1 is discharged, between hotblast stove 1 and low-temperature preheating system 8, is delivered to low-temperature preheating system (8), is discharged after heat exchange by low temperature flue 7.High temperature mixes gas flue 6 between hotblast stove 1 and hotblast stove comburent air duct 5, and high temperature mixes gas flue 6 and draws from the combustion chamber of hotblast stove 1 or regenerator top, and high-temperature flue gas is delivered to hotblast stove comburent air duct 5 from hotblast stove 1.High-temperature flue gas mixes with the combustion air after preheating, and make the temperature of combustion air be more than or equal to 800 DEG C, oxygen volume content is less than or equal to 18%.
Hotblast stove combustion air is provided by hotblast stove burner blower, after low-temperature preheating system preheating, be mixed into temperature with flue gas and be more than or equal to 800 DEG C, oxygen volume content is less than or equal to the high-temperature low-oxygen combustion air of 18%, through hotblast stove comburent air duct, variable valve, trip valve enters hotblast stove and low-heat value gas reacts, show as high-temperature and low-oxygen combustion, for regenerator provides heat.
Low-heat value gas from gaspipe network enters low-temperature preheating system through gas main, is preheated to about 200 DEG C, and through hotblast stove gas line, variable valve, trip valve, enters hotblast stove and burn.
The high-temperature flue gas part that Combustion of Hot Air Furnace produces is mixed gas flue from high temperature and is drained, and residue flue gas, after regenerator heat exchange, is discharged from low temperature flue.Because hotblast stove is periodic duty, therefore flue gas fluctuates in certain temperature range, and medial temperature is about 300 DEG C.Be connected by low temperature flue between hotblast stove with low-temperature preheating system, hot-blast stove fume enters low temperature flue through trip valve, drains or for other users after low-temperature preheating system heat exchange.
Hotblast stove is the final user of low-heat value gas and high-temperature low-oxygen combustion air in 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 hotblast stove can be premixed type burner or spreading combustion burner.There is high-temperature and low-oxygen combustion and react in low-heat value gas and high-temperature low-oxygen combustion air, the indoor homogeneous temperature of whole Combustion of Hot Air Furnace, the uniform high-temperature flue gas flow field of corresponding generation in hotblast stove.Owing to eliminating district of localized hyperthermia, therefore effectively can suppress the growing amount of oxynitride, both having stablized provides high-temperature hot-air, controls again the generation of the pollutents such as oxynitride.
Increase high-temperature flue (13), high temperature preheating system (14), high temperature preheating rear pass (15), combustion air by-pass line (16), combustion air low-temperature prewarming pipeline (17), combustion air preheated in high temperature pipeline (18)
Need the regulation range strengthening combustion air preheating temperature and oxygen content, or when making the two independently regulate, high temperature preheating system 14, high-temperature flue 13, high temperature preheating rear pass 15, combustion air by-pass line 16, combustion air low-temperature prewarming pipeline 17, combustion air preheated in high temperature pipeline 18 can be increased on the basis of above-mentioned composition.High temperature preheating is carried out to hotblast stove combustion air, in independently scope, the preheating temperature of combustion air and oxygen level is controlled at more accurate, row.High temperature preheating system and low-temperature preheating system, between high temperature preheating system and low-temperature preheating system, couple together by combustion air low-temperature prewarming pipeline 17, for the combustion air after transporting low temperature preheating.High temperature preheating system and hotblast stove comburent air duct, between high temperature preheating system and hotblast stove comburent air duct, couple together by combustion air preheated in high temperature pipeline, for carrying the combustion air after high temperature preheating.Combustion air by-pass line is connected with combustion air low-temperature prewarming pipeline and combustion air preheated in high temperature pipeline respectively, combustion air low-temperature prewarming pipeline and combustion air preheated in high temperature pipeline are coupled together, during high temperature preheating system overhaul, combustion air bypass pipe enters hotblast stove for carrying combustion air.Hotblast stove and high temperature preheating system, between hotblast stove and high temperature preheating system, couple together, for carrying high-temperature flue gas by high-temperature flue.High temperature preheating rear pass is between high temperature preheating system and low temperature flue, high temperature preheating system and low temperature flue are coupled together, for the flue gas after high temperature preheating is delivered into low temperature flue, after mixing with hotblast stove low-temperature flue gas out, enter low-temperature preheating system.High temperature mixes gas flue between high-temperature flue and combustion air preheated in high temperature pipeline, high-temperature flue and combustion air preheated in high temperature pipeline are coupled together, for being sent in combustion air by a part of high-temperature flue gas, after mixing with combustion air, enter hotblast stove through hotblast stove comburent air duct.
Also can adopt the independence realizing combustion air preheating temperature and oxygen content in another way to regulate.Hotblast stove is comprised, trip valve, variable valve in system, hotblast stove gas line, hotblast stove comburent air duct, high temperature mixes gas flue, low temperature flue, low-temperature preheating system, from the gas main of pipe network, combustion air house steward, hotblast stove burner blower, heat exchange rear pass, on the basis of combustion air low-temperature prewarming pipeline, increase high temperature preheating system, high-temperature flue, main flue after high temperature preheating, combustion air by-pass line, combustion air preheated in high temperature pipeline.High temperature preheating system and low-temperature preheating system, between high temperature preheating system and low-temperature preheating system, couple together by combustion air low-temperature prewarming pipeline, for the combustion air after transporting low temperature preheating.High temperature preheating system and hotblast stove comburent air duct, between high temperature preheating system and hotblast stove comburent air duct, couple together by combustion air preheated in high temperature pipeline, for carrying the combustion air after high temperature preheating.Combustion air by-pass line is connected with combustion air low-temperature prewarming pipeline and combustion air preheated in high temperature pipeline respectively, combustion air low-temperature prewarming pipeline and combustion air preheated in high temperature pipeline are coupled together, during high temperature preheating system overhaul, combustion air bypass pipe enters hotblast stove for carrying combustion air.Hotblast stove and high temperature preheating system, between hotblast stove and high temperature preheating system, couple together, for carrying high-temperature flue gas by high-temperature flue.After high temperature preheating, main flue is between high temperature preheating system and low-temperature preheating system, high temperature preheating system and low-temperature preheating system is coupled together, for the flue gas after high temperature preheating is delivered into low-temperature preheating system.High temperature mixes gas flue between high-temperature flue and combustion air preheated in high temperature pipeline, high-temperature flue and combustion air preheated in high temperature pipeline are coupled together, for being sent in combustion air by a part of high-temperature flue gas, after mixing with combustion air, enter hotblast stove through hotblast stove comburent air duct.Hotblast stove and high-temperature flue, between hotblast stove and high-temperature flue, couple together by low temperature flue, for the low-temperature flue gas that heat air delivery fire grate goes out, enter high temperature preheating system with high-temperature flue gas after mixing.
In actual applications, due to the difference of iron-smelting process, as blast furnace ironmaking, fused reduction iron-smelting etc., operating mode is not identical yet.In traditional blast furnace iron-making process, because the factors such as furnace volume, combustion intensity, technical process, working system, coal gas condition vary, the hot blast temperature produce hotblast stove and air quantity require also completely different.In addition, the hotblast stove form that different engineering is selected also is not quite similar, and comprises the hotblast stove of the forms such as top ignition, internal combustion type, external combustion type and ball.The feature of efficient low-discharging high temperature low oxygen hot blast furnace of the present invention is exactly: by the growing amount of the high-temperature flue gas that produces roasting kiln, temperature, the isoparametric accurate control of oxygen level, accurately can control the preheating temperature of hotblast stove combustion air and oxygen content, when single fire low-heat value gas, continous-stable provide temperature to be more than or equal to the hot blast of 1250 DEG C for blast furnace, and quick adjustment can be carried out according to the condition of production at any time, while ensureing high wind-warm syndrome, the oxygen level of strict control combustion air, thus the growing amount effectively controlling oxynitride.Because the form of efficient low-discharging high temperature low oxygen hot blast furnace of the present invention to concrete hotblast stove does not limit, therefore this hotblast stove is not only applicable to the engineerings such as newly-built blast furnace ironmaking, is applicable to the improvement projects such as blast furnace overhaul completely yet.
In sum, the major advantage of efficient low-discharging high temperature low oxygen hot blast furnace of the present invention is as follows:
1) be applicable to different metallurgical technology flow processs, comprise blast furnace iron-making process, ironmaking technique of fusion and reduction etc.;
2) can flexible adaptation to the heat size, combustion intensity, technical process, working system, coal gas condition etc. of different blast furnace, applied widely;
3) not by 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, be also applicable to overhauling reform engineering;
5) by accurately controlling the burning of roasting kiln, realizing the preheating temperature to hotblast stove combustion air and the isoparametric accurate control of oxygen content, and then realizing the high-temperature and low-oxygen combustion in hotblast stove;
6) when single fire low-heat value gas, can be user and stablize the high-temperature hot-air providing temperature to be more than or equal to 1250 DEG C;
7) combustion system of high-temperature low-oxygen, eliminates district of localized hyperthermia, smoke-filling movement evenly, effectively inhibit generation and the discharge of the pollutions such as NOx and nuisance simultaneously, be conducive to protection of the environment;
8) can combinationally use with the low-temperature pre-heating device of various combustion air and coal gas, abundant Mist heat recovering, improve the thermo-efficiency of this hotblast stove further.
Accompanying drawing explanation
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 comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, combustion air low-temperature prewarming pipeline 17.
Fig. 2 is 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 comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, high-temperature flue 13, high temperature preheating system 14, high temperature preheating rear pass 15, combustion air by-pass line 16, combustion air low-temperature prewarming pipeline 17, combustion air preheated in high temperature pipeline 18.
Fig. 3 is 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 comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, high-temperature flue 13, high temperature preheating system 14, combustion air by-pass line 16, combustion air low-temperature prewarming pipeline 17, combustion air preheated in high temperature pipeline 18, main flue 19 after high temperature preheating.
Embodiment
Fig. 1, Fig. 2 and Fig. 3 are specific implementation of the present invention respectively
As shown in Figure 1, efficient low-discharging 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 comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, combustion air low-temperature prewarming pipeline 17.
From the low-heat value gas of gaspipe network through entering low-temperature preheating system 8 from the gas main 9 of pipe network, by about gas preheating to 200 DEG C, through hotblast stove gas line 4, variable valve 3, trip valve 2, enters hotblast stove 1 and burns.
Hotblast stove combustion air is provided by hotblast stove burner blower 11, low-temperature preheating system 8 is entered after combustion air house steward 10, be preheated to about 200 DEG C, the combustion air after low-temperature prewarming enters hotblast stove comburent air duct 5 through combustion air low-temperature prewarming pipeline 17.High temperature mixes gas flue 6 and draws from the combustion chamber of hotblast stove 1 or regenerator top, the high-temperature flue gas of more than 1000 DEG C is sent into hotblast stove with in comburent air duct 5, high-temperature flue gas mixes in hotblast stove comburent air duct 5 with the combustion air after low-temperature prewarming, obtain temperature and be more than or equal to 800 DEG C, the volume percent of oxygen is less than or equal to 18% hotblast stove high-temperature low-oxygen combustion air, high-temperature low-oxygen combustion air is through hotblast stove comburent air duct 5, variable valve 3, trip valve 2 enters hotblast stove 1, react with low-heat value gas, show as high-temperature and low-oxygen combustion, for regenerator provides heat.
The high-temperature flue gas that hotblast stove 1 burning produces, after regenerator heat exchange, is discharged from low temperature flue 7.Because hotblast stove 1 is periodic duty, therefore flue gas fluctuates in certain temperature range, and medial temperature is about 300 DEG C.Hot-blast stove fume enters low temperature flue 7 through trip valve 2, drains or for other user after low-temperature preheating system 8 heat exchange.
Hotblast stove 1 is the final user of middle low-heat value gas and high-temperature low-oxygen combustion air.The form of hotblast stove 1 can be top ignition, internal combustion type, external combustion type etc., also can be pebble stove.Burner in hotblast stove 1 can be premixed type burner or spreading combustion burner.There is high-temperature and low-oxygen combustion and react in low-heat value gas and high-temperature low-oxygen combustion air, the indoor homogeneous temperature of whole Combustion of Hot Air Furnace, the uniform high-temperature flue gas flow field of corresponding generation in hotblast stove.Owing to eliminating district of localized hyperthermia, therefore effectively can suppress the growing amount of oxynitride, both having stablized provides high wind-warm syndrome, controls again the generation of the pollutents such as oxynitride.
Fig. 2 is another kind of implementation of the present invention.Wherein, hotblast stove 1, trip valve 2, variable valve 3, hotblast stove gas line 4, hotblast stove comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, high-temperature flue 13, high temperature preheating system 14, high temperature preheating rear pass 15, combustion air by-pass line 16, combustion air low-temperature prewarming pipeline 17, combustion air preheated in high temperature pipeline 18.
From the low-heat value gas of gaspipe network through entering low-temperature preheating system 8 from the gas main 9 of pipe network, by about gas preheating to 200 DEG C, through hotblast stove gas line 4, variable valve 3, trip valve 2, enters hotblast stove 1 and burns.
Hotblast stove combustion air is provided by hotblast stove burner blower 11, low-temperature preheating system 8 is entered after combustion air house steward 10, be preheated to about 200 DEG C, combustion air after low-temperature prewarming enters high temperature preheating system 14 through combustion air low-temperature prewarming pipeline 17, be preheated to more than 500 DEG C, obtain high temperature preheating combustion air, enter hotblast stove comburent air duct 5 through combustion air preheated in high temperature pipeline 18.High-temperature flue 13 is drawn from the combustion chamber of hotblast stove 1 or regenerator top, the high-temperature flue gas of more than 1000 DEG C is drawn from hotblast stove, part high-temperature flue gas mixes gas flue 6 through high temperature and enters combustion air preheated in high temperature pipeline 18, after mixing with the combustion air after high temperature preheating, obtain temperature and be more than or equal to 800 DEG C, the volume percent of oxygen is less than or equal to 18% hotblast stove high-temperature low-oxygen combustion air, high-temperature low-oxygen combustion air is through hotblast stove comburent air duct 5, variable valve 3, trip valve 2 enters hotblast stove 1, react with low-heat value gas, show as high-temperature and low-oxygen combustion, for regenerator provides heat.Remaining high-temperature flue gas of drawing from hotblast stove is through high-temperature flue 13, and variable valve 3 enters high temperature preheating system 14, enters low temperature flue 7 after heat exchange through high temperature preheating rear pass 15.
The high-temperature flue gas that hotblast stove 1 burning produces, after regenerator heat exchange, is discharged from low temperature flue 7.Because hotblast stove 1 is periodic duty, therefore flue gas fluctuates in certain temperature range, and medial temperature is about 300 DEG C.Hot-blast stove fume enters low temperature flue 7 through trip valve 2, after mixing, to drain or for other user after low-temperature preheating system 8 heat exchange with the flue gas from high temperature preheating rear pass 15.
Combustion air by-pass line 16 is connected with combustion air low-temperature prewarming pipeline 17 and combustion air preheated in high temperature pipeline 18 respectively, when high temperature preheating system 14 cannot use because of maintenance, combustion air directly enters hotblast stove comburent air duct 5 by combustion air by-pass line 16, through hotblast stove comburent air duct 5, variable valve 3, trip valve 2 enters hotblast stove 1 and participates in burning.
This implementation can be mixed gas flue 6 by regulating high temperature and enter the exhaust gas volumn of high temperature preheating system 14, realizes the independent fine adjustment to hotblast stove combustion air preheating temperature and oxygen level, better meets the various working condition of blast furnace.
Fig. 3 is another kind of implementation of the present invention.Wherein, hotblast stove 1, trip valve 2, variable valve 3, hotblast stove gas line 4, hotblast stove comburent air duct 5, high temperature mix gas flue 6, low temperature flue 7, low-temperature preheating system 8, gas main 9 from pipe network, combustion air house steward 10, hotblast stove burner blower 11, heat exchange rear pass 12, high-temperature flue 13, high temperature preheating system 14, combustion air by-pass line 16, combustion air low-temperature prewarming pipeline 17, combustion air preheated in high temperature pipeline 18, main flue 19 after high temperature preheating.
Be with the difference of Fig. 2, the high-temperature flue gas that hotblast stove 1 burning produces is after regenerator heat exchange, discharge from low temperature flue 7, low-temperature flue gas enters high-temperature flue 13 through low temperature flue 7, high temperature preheating system 14 is entered after mixing with high-temperature flue gas, enter main flue 19 after high temperature preheating after heat exchange, after high temperature preheating, main flue 19 enters low-temperature preheating system 8, drains or for other user after heat exchange.
This implementation increases the exhaust gas volumn entering high temperature preheating system, be applicable to circulation area greatly, the heat-exchange system of not easily dust stratification.
Efficient low-discharging 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 process, various operating mode can flexible adaptation; Can combinationally use with various forms of hotblast stove; Be not only applicable to new project, also can meet overhauling reform project demand; Low-heat value gas and Absorbable organic halogens is used to provide the high wind-warm syndrome of more than 1250 DEG C; Can the generation of effective control polluted articles; Combinationally use with various low-temperature preheating system, can further improve thermo-efficiency.
Claims (6)
1. efficient low-discharging high temperature low oxygen hot blast furnace, comprise: hotblast stove (1), trip valve (2), variable valve (3), hotblast stove gas line (4), hotblast stove comburent air duct (5), high temperature mix gas flue (6), low temperature flue (7), low-temperature preheating system (8), gas main (9) from pipe network, combustion air house steward (10), hotblast stove is with burner blower (11), heat exchange rear pass (12), combustion air low-temperature prewarming pipeline (17); It is characterized in that, hotblast stove comburent air duct (5) is positioned between hotblast stove (1) and combustion air low-temperature prewarming pipeline (17), hotblast stove (1) and combustion air low-temperature prewarming pipeline (17) are coupled together, for heat air delivery stove combustion air; Combustion air low-temperature prewarming pipeline (17) is positioned between hotblast stove comburent air duct (5) and low-temperature preheating system (8), hotblast stove comburent air duct (5) and low-temperature preheating system (8) are coupled together, for the combustion air after transporting low temperature preheating; Hotblast stove gas line (4) is positioned between hotblast stove (1) and low-temperature preheating system (8), hotblast stove (1) and low-temperature preheating system (8) are coupled together, for carrying the hotblast stove coal gas after preheating; Low temperature flue (7) is positioned between hotblast stove (1) and low-temperature preheating system (8), the flue gas that hotblast stove (1) is discharged is delivered to low-temperature preheating system (8), discharges after heat exchange; High temperature mixes gas flue (6) and is positioned between hotblast stove (1) and hotblast stove comburent air duct (5), high temperature mixes gas flue (6) and draws from the combustion chamber of hotblast stove (1) or regenerator top, and high-temperature flue gas is delivered to hotblast stove comburent air duct (5) from hotblast stove (1); High-temperature flue gas mixes with the combustion air after preheating, and make the temperature of combustion air be more than or equal to 800 DEG C, oxygen volume content is less than or equal to 18%.
2. hotblast stove according to claim 1, it is characterized in that, increase high-temperature flue (13), high temperature preheating system (14), high temperature preheating rear pass (15), combustion air by-pass line (16), combustion air low-temperature prewarming pipeline (17), combustion air preheated in high temperature pipeline (18), combustion air low-temperature prewarming pipeline (17) is positioned between high temperature preheating system (14) and low-temperature preheating system (8), high temperature preheating system (14) and low-temperature preheating system (8) are coupled together, for the combustion air after transporting low temperature preheating, combustion air preheated in high temperature pipeline (18) is positioned between high temperature preheating system (14) and hotblast stove comburent air duct (5), high temperature preheating system (14) and hotblast stove comburent air duct (5) are coupled together, for carrying the combustion air after high temperature preheating, combustion air by-pass line (16) is connected with combustion air low-temperature prewarming pipeline (17) and combustion air preheated in high temperature pipeline (18) respectively, combustion air low-temperature prewarming pipeline (17) and combustion air preheated in high temperature pipeline (18) are coupled together, during high temperature preheating system (14) maintenance, combustion air by-pass line (16) enters hotblast stove (1) for carrying combustion air, high-temperature flue (13) is positioned between hotblast stove (1) and high temperature preheating system (14), couples together, hotblast stove (1) and high temperature preheating system (14) for carrying high-temperature flue gas, high temperature preheating rear pass (15) is positioned between high temperature preheating system (14) and low temperature flue (7), high temperature preheating system (14) and low temperature flue (7) are coupled together, flue gas after high temperature preheating is delivered into low temperature flue (7), after mixing with hotblast stove (1) low-temperature flue gas out, enters low-temperature preheating system (8), high temperature mixes gas flue (6) and is positioned between high-temperature flue (13) and combustion air preheated in high temperature pipeline (18), high-temperature flue (13) and combustion air preheated in high temperature pipeline (18) are coupled together, a part of high-temperature flue gas is sent in combustion air, after mixing with combustion air, enter hotblast stove (1) through hotblast stove comburent air duct (5).
3. hotblast stove according to claim 2, it is characterized in that, main flue (19) after increase high temperature preheating, high temperature preheating is carried out to hotblast stove combustion air, the preheating temperature of combustion air and oxygen level are controlled in independently scope at more accurate, row, strengthen the exhaust gas volumn entering high temperature preheating system, enhanced heat exchange; High-temperature flue (13) is positioned between hotblast stove (1) and high temperature preheating system (14), couples together, hotblast stove (1) and high temperature preheating system (14) for carrying high-temperature flue gas; After high temperature preheating, main flue (19) is positioned between high temperature preheating system (14) and low-temperature preheating system (8), high temperature preheating system (14) and low-temperature preheating system (8) are coupled together, for the flue gas after high temperature preheating is delivered into low-temperature preheating system (8); High temperature mixes gas flue (6) and is positioned between high-temperature flue (13) and combustion air preheated in high temperature pipeline (18), high-temperature flue (6) and combustion air preheated in high temperature pipeline (18) are coupled together, a part of high-temperature flue gas is sent in combustion air, after mixing with combustion air, enter hotblast stove (1) through hotblast stove comburent air duct (5); Low temperature flue (7) is positioned between hotblast stove (1) and high-temperature flue (13), hotblast stove (1) and high-temperature flue (13) are coupled together, for the low-temperature flue gas that heat air delivery stove (1) is discharged, after mixing with high-temperature flue gas, enter high temperature preheating system (14).
4. hotblast stove according to claim 2, is characterized in that, high-temperature flue (13) is drawn from the combustion chamber of hotblast stove (1) or regenerator top.
5. hotblast stove according to claim 1, it is characterized in that, hotblast stove combustion air is provided by hotblast stove burner blower (11), after low-temperature preheating system (8) preheating, be mixed into temperature with flue gas and be more than or equal to 800 DEG C, oxygen volume content is less than or equal to the high-temperature low-oxygen combustion air of 18%, enter hotblast stove (1) react with low-heat value gas through hotblast stove comburent air duct (5), variable valve (2), trip valve (3), show as high-temperature and low-oxygen combustion, for regenerator provides heat.
6. hotblast stove according to claim 2, it is characterized in that, hotblast stove combustion air is provided by hotblast stove burner blower (11), after low-temperature preheating system (8) and high temperature preheating system (14) preheating, be mixed into temperature with flue gas and be more than or equal to 800 DEG C, oxygen volume content is less than or equal to the high-temperature low-oxygen combustion air of 18%, through hotblast stove with comburent air duct (5), variable valve (2), trip valve (3) enters hotblast stove (1) and reacts with low-heat value gas, show as high-temperature and low-oxygen combustion, for regenerator provides heat.
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| CN109338053A (en) * | 2018-09-29 | 2019-02-15 | 中冶南方（武汉）热工有限公司 | Reduce the radiant tube heating system and method for discharged nitrous oxides |
| CN115597368A (en) * | 2022-12-14 | 2023-01-13 | 淄博博牧窑炉技术有限公司（Cn） | Method and device for producing cyanuric acid by heating tunnel type urea cracking furnace based on natural gas hot blast stove |
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