CN104099435B - For sleeve pipe coal spouting gun provides oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration - Google Patents
For sleeve pipe coal spouting gun provides oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration Download PDFInfo
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- CN104099435B CN104099435B CN201410337631.2A CN201410337631A CN104099435B CN 104099435 B CN104099435 B CN 104099435B CN 201410337631 A CN201410337631 A CN 201410337631A CN 104099435 B CN104099435 B CN 104099435B
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Abstract
The invention belongs to technical field of blast furnace process, particularly a kind ofly provide oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, according to the injecting coal quantity size of pulverized coal injection in blast furnace, the amount of substance of oxygen needed for the Units of Account time; The amount of substance of oxygen needed for unit time is entered the tuyere zone of blast furnace respectively simultaneously by the first oxygen branch road and the second oxygen branch road; Adjusted in described mixed gas by the amount of substance of oxygen of the second oxygen branch road and the ratio of the amount of substance of nitrogen by the current-limiting apparatus being arranged on the first oxygen branch road, the second oxygen branch road and nitrogen branch road.The present invention is by dividing two-way by the amount of substance of the corresponding oxygen of injecting coal quantity size with pulverized coal injection in blast furnace, one tunnel is through hot blast module, another road mixes with nitrogen and enters blast furnace through sleeve pipe coal spouting gun, improve the oxygen concentration of tuyere zone, and then improve the efficiency of combustion of coal dust under the premise that security is guaranteed.
Description
Technical field
The invention belongs to technical field of blast furnace process, particularly a kind ofly provide oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun.
Background technology
Along with the development of society, more and more stricter to the emission limit set of industrial gaseous waste.Blast-furnace smelting belongs to highly energy-consuming and high pollution industry, and the discharge of raising fuel availability, reduction waste gas is more and more important.Coke is the main raw material of blast-furnace smelting, how to improve the utilization ratio of coke, reduces and is burnt by coke and the obnoxious flavour that produces becomes the problem that those skilled in the art are devoted to study.
At present, adopt pulverized coal injection in blast furnace technology can improve the utilization ratio of coke, reduce the consumption of coke, reduce the generation of obnoxious flavour.But along with injecting coal quantity increase, the theoretical combustion temperature of Tuyere Raceway can constantly reduce, and is unfavorable for the smelting of blast furnace, need carries out heat compensation to tuyere zone.The method compensated is generally following two kinds: a kind of is by providing the wind-warm syndrome entering tuyere zone to realize compensating tuyere zone heat; Another kind is by taking oxygen enrichment to operate, and the oxygen concentration that raising enters in tuyere zone hot blast is to improve the theoretical combustion temperature of tuyere zone.
But the wind-warm syndrome adopted in industry at present reaches 1100-1250 DEG C, the cost improving wind-warm syndrome is further higher, and realizes comparatively difficulty.Therefore, the oxygen concentration improved in hot blast becomes the prefered method compensating tuyere zone heat.The oxygen concentration improved in hot blast generally adopts following two kinds of modes: oxygen and cold wind mix by the first before hotblast stove, then mixed gas is sent into tuyere zone after hot-air system heating; Another kind of mode is that quantitative oxygen is added tuyere zone by sleeve pipe coal spouting gun, so can improve oxygen enrichment percentage, make coal dust and oxygen mix more evenly and improve the efficiency of combustion of coal dust, and then improve coal dust utilization ratio, contribute to reducing oxygen concentration in hotblast stove, reduce nitrogen oxygen traffic and produce the harm causing intergranular stress corrosion.Utilize the blast furnace buying expenses of sleeve pipe coal spouting gun coal powder injection higher, and oxygen coal mixes in spray process, highly purified oxygen contacts with fine powdered coal, there is the possibility of blast, has potential safety hazard.
Therefore, needing badly a kind ofly provides oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, to contact under the prerequisite of blasting improve oxygen enrichment percentage avoiding oxygen with particle coal dust.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly provides the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, to realize under the prerequisite eliminating the potential safety hazard using sleeve pipe coal spouting gun to bring, improve oxygen concentration in hot blast, and then improve the theoretical combustion temperature of tuyere zone, improve the efficiency of combustion of coal.
For solving the problems of the technologies described above, the invention provides a kind ofly provides the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, comprises the steps:
Step a: according to the injecting coal quantity size of pulverized coal injection in blast furnace, the amount of substance of oxygen needed for the Units of Account time;
Step b: the amount of substance of oxygen needed for the described unit time is entered the tuyere zone of described blast furnace respectively simultaneously by the first oxygen branch road and the second oxygen branch road, to be mixed with cold wind by the oxygen of described first oxygen branch road and after the hot-air system of described blast furnace, enter the tuyere zone of described blast furnace, by the oxygen of described second oxygen branch road be mixed to form mixed gas by the nitrogen of nitrogen branch road and enter the tuyere zone of described blast furnace through the sleeve pipe coal spouting gun be arranged on blast furnace;
Step c: adjusted in described mixed gas by the described amount of substance of oxygen of the second oxygen branch road and the ratio of the amount of substance of nitrogen by the current-limiting apparatus being arranged on described first oxygen branch road, described second oxygen branch road and described nitrogen branch road.
Further, also comprise after described step c
Steps d: the injecting coal quantity size detecting described pulverized coal injection in blast furnace, if the injecting coal quantity size of described pulverized coal injection in blast furnace increases, then recalculate the amount of substance of oxygen needed for the unit time, and described in foundation, recalculate the amount of substance of oxygen needed for the unit time, control described first oxygen branch road, described second oxygen branch road and described nitrogen branch road to recalculate the amount of substance of oxygen needed for the unit time to blast furnace input; If the injecting coal quantity size of described pulverized coal injection in blast furnace reduces, then recalculate the amount of substance of oxygen needed for the unit time, and described in foundation, recalculating the amount of substance of oxygen needed for the unit time, the amount of substance controlling described first oxygen branch road, described second oxygen branch road and described nitrogen branch road reduction oxygen accounts for the ratio of the amount of substance of described mixed gas.
Further, described recalculate the amount of substance of oxygen needed for the unit time after also comprise according to described in recalculate oxygen needed for the unit time amount of substance increase the unit time by the amount of substance of the oxygen of the second oxygen branch road, reduce the amount of substance of unit time by the oxygen of the first oxygen branch road, and make the unit time to be equaled by the amount of substance sum of the oxygen of the second oxygen branch road by the amount of substance of the oxygen of the first oxygen branch road and unit time described in recalculate the amount of substance of oxygen needed for the unit time.
Further, described current-limiting apparatus comprises the first oxygen valve of being arranged on described first oxygen branch road and the first oxygen flow meter, the second oxygen valve being arranged on described second oxygen branch road and the second oxygen flow take into account the nitrogen valve and nitrogen gas stream gauge that are arranged on described nitrogen branch road.
Further, described mixed gas is stored in mixed gas tank, and described mixed gas tank is connected with described sleeve pipe coal spouting gun.
Relative to prior art, provided by the inventionly a kind ofly provide the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, by being divided into two-way by with the amount of substance of oxygen needed for the injecting coal quantity size corresponding unit time of pulverized coal injection in blast furnace, one tunnel mixes with cold wind and after hot-air system, enters the tuyere zone of blast furnace, to make in mixed gas oxygen level higher than the oxygen level in air, improve the oxygen concentration in hot blast, and then improve the efficiency of combustion of coal dust; Meanwhile, another road and nitrogen are mixed to form mixed gas and spray into blast furnace tuyere area by sleeve pipe coal spouting gun, oxygen content in the effect mixed gas of current-limiting apparatus can control in atmosphere on oxygen level, also improve the oxygen concentration in hot blast, and then improve the efficiency of combustion of coal dust; And by controlling the content of nitrogen in mixed gas, avoiding situation about setting off an explosion because oxygen concentration is excessive and occurring; In addition, also certain at the amount of substance of the oxygen of the injecting coal quantity size one timing input blast furnace of pulverized coal injection in blast furnace, the oxygen concentration entering blast furnace through the first oxygen branch road can reduce, and then the oxygen concentration reduced by hot-air system, decrease oxynitride and produce and cause the harm of hot-air system intergranular stress corrosion.
The present invention also further provides a kind of and provides the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, comprises detection module: be connected with the nozzle of pulverized coal injection in blast furnace, for detecting the injecting coal quantity size of pulverized coal injection in blast furnace; Computing module: be connected with described detection module, the amount of substance of oxygen needed for the injecting coal quantity size Units of Account time of the pulverized coal injection in blast furnace detected according to described detection module; Hot blast module: comprise the first oxygen branch road and hot-air system, described first oxygen branch road is connected with described hot-air system, and described hot-air system is connected with described blast furnace; Mixed gas module: comprise the second oxygen branch road, nitrogen branch road, mixed gas tank and sleeve pipe coal spouting gun, one end of described second oxygen branch road is communicated with described first oxygen branch road, the other end of described second oxygen branch road is communicated with described nitrogen branch road, the end that described second oxygen branch road is communicated with described nitrogen branch road is communicated with described mixed gas tank, described mixed gas tank is connected with sleeve pipe coal spouting gun, and described sleeve pipe coal spouting gun is arranged on described blast furnace; Current-limiting apparatus: comprise the first flow-restriction, the second flow-restriction and the 3rd flow-restriction, described first flow-restriction is arranged on described first oxygen branch road, described second flow-restriction is arranged on described second oxygen branch road, and described 3rd flow-restriction is arranged on described nitrogen branch road.
Further, also comprise judge module and control module, described judge module respectively with described computing module, described detection module and described control module connect, described judge module is for judging the change of the injecting coal quantity size of pulverized coal injection in blast furnace, described computing module is for the amount of substance of oxygen needed for unit time corresponding to the injecting coal quantity size that calculates the pulverized coal injection in blast furnace after change, described control module is for controlling described first flow-restriction, described second flow-restriction and described 3rd flow-restriction are so that the amount of substance changing oxygen accounts for the ratio of the amount of substance of described mixed gas.
Further, described first flow-restriction comprises the first oxygen valve and the first oxygen flow meter that are arranged on described first oxygen branch road, described second flow-restriction comprises the second oxygen valve and the second oxygen flow meter that are arranged on described second oxygen branch road, and described 3rd flow-restriction comprises the nitrogen valve and nitrogen gas stream gauge that are arranged on described nitrogen branch road.
Further, described current-limiting apparatus also comprises total flow-restriction, and the end that described first oxygen branch road is communicated with described second oxygen branch road is connected with described total flow-restriction, and described total flow-restriction comprises total oxygen flow meter and total oxygen valve.
Further, mixed gas valve is also provided with between the end that is communicated with of described second oxygen branch road and described nitrogen branch road and described mixed gas tank.
Provided by the inventionly a kind ofly provide the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, by arranging hot blast module and mixed gas module simultaneously, the amount of substance of oxygen needed for unit time corresponding for injecting coal quantity size with pulverized coal injection in blast furnace is divided into two portions, a part to mix with cold wind through hot blast module and heats, improve the oxygen concentration in cold wind, and then improve the efficiency of combustion of coal dust; Meanwhile, another part is mixed to form mixed gas through mixed gas module and nitrogen, by a nitrogen content in restriction mixed gas, make the oxygen content in mixed gas can control in atmosphere on oxygen level, also improve the oxygen concentration in hot blast, and then improve the efficiency of combustion of coal dust; Therefore the amount of substance being divided into oxygen needed for the two-part unit time all improves the oxygen concentration of hot-air mouth, improves the efficiency of combustion of coal dust; And by controlling the content of nitrogen in mixed gas, avoiding situation about setting off an explosion because oxygen concentration is excessive and occurring; In addition, unit time is certain by the oxygen of hot blast module and mixed gas module, when the part of oxygen that mixed gas module is divided, the oxygen concentration of the hot-air system in hot blast module comparatively only has during hot blast module and reduces, and decreases oxynitride and produces and the harm that causes hot-air system intergranular stress corrosion.
Accompanying drawing explanation
In order to be illustrated more clearly in embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
What Fig. 1 provided for embodiment of the present invention one a kind ofly provides the richness of the adjustable nitrogen oxygen atmosphere of concentration to support the schematic flow sheet of technique for sleeve pipe coal spouting gun;
What Fig. 2 provided for embodiment of the present invention two a kind ofly provides the richness of the adjustable nitrogen oxygen atmosphere of concentration to support another schematic flow sheet of technique for sleeve pipe coal spouting gun;
A kind of structural representation that the device of the adjustable nitrogen oxygen atmosphere of concentration is provided for sleeve pipe coal spouting gun that Fig. 3 provides for embodiment of the present invention three.
Wherein, 1, oxygen; 2, total oxygen valve; 3, total oxygen flow meter; 4, the first oxygen valve; 5, the first oxygen flow meter; 6, cold wind; 7, hotblast stove; 8, air port; 9, nitrogen; 10, nitrogen valve; 11, nitrogen gas stream gauge; 12, mixed gas valve; 13, mixed gas tank; 14, sleeve pipe coal spouting gun; 15, blast furnace; 16, the second oxygen valve; 17, the second oxygen flow meter.
Embodiment
Below in conjunction with the accompanying drawing in embodiment of the present invention, be clearly and completely described the technical scheme in embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
Embodiment one
As shown in Figure 1, what Fig. 1 provided for embodiment of the present invention one a kind ofly provides the richness of the adjustable nitrogen oxygen atmosphere of concentration to support the schematic flow sheet of technique for sleeve pipe coal spouting gun.
Provided by the inventionly a kind ofly provide the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun.
Wherein,
Step S10: according to the injecting coal quantity size of pulverized coal injection in blast furnace, the amount of substance of oxygen needed for the Units of Account time.In the present embodiment, relevant staff needs according to what produce the injecting coal quantity size determining pulverized coal injection in blast furnace.Then calculate according to the proportioning of carbon oxygen when the injecting coal quantity size of the pulverized coal injection in blast furnace determined and carbon and oxygen perfect combustion, obtain the amount of substance of the oxygen needed for injecting coal quantity size of the pulverized coal injection in blast furnace that perfect combustion is determined.Then revise according to the amount of substance of practical situation to required oxygen.
Be understandable that, can be manually calculate during the amount of substance of the oxygen needed for the injecting coal quantity size determining the pulverized coal injection in blast furnace that perfect combustion is determined, also can be that the calculating device by being connected with blast furnace blowing mouth draws.Concrete, blast furnace blowing mouth is connected with injecting coal quantity detector, and injecting coal quantity detector can detect the injecting coal quantity size of the pulverized coal injection in blast furnace that blast furnace blowing mouth goes out in real time; Injecting coal quantity detector is connected with computer system, computer system can accept the injecting coal quantity size data of the pulverized coal injection in blast furnace that injecting coal quantity detector detects, and the related algorithm of the amount of substance of oxygen needed for the injecting coal quantity size of the pulverized coal injection in blast furnace determined according to the calculating perfect combustion pre-set, draw the amount of substance of the oxygen needed for the injecting coal quantity size unit time of the pulverized coal injection in blast furnace that perfect combustion is determined.
Step S20: the amount of substance of oxygen needed for the described unit time is entered the tuyere zone of described blast furnace respectively simultaneously by the first oxygen branch road and the second oxygen branch road, to be mixed with cold wind by the oxygen of described first oxygen branch road and after the hot-air system of described blast furnace, enter the tuyere zone of described blast furnace, by the oxygen of described second oxygen branch road be mixed to form mixed gas by the nitrogen of nitrogen branch road and enter the tuyere zone of described blast furnace through the sleeve pipe coal spouting gun be arranged on blast furnace.In the present embodiment, the amount of substance of the oxygen needed for the injecting coal quantity size of the pulverized coal injection in blast furnace perfect combustion calculated determined is divided into first part and second section, and the amount of substance sum of the unit time oxygen of first part and second section equals the amount of substance of the oxygen needed for injecting coal quantity size of the pulverized coal injection in blast furnace that perfect combustion is determined.Concrete distribution first part rule of thumb determines with particular case with the ratio of the amount of substance of the oxygen of second section unit time.After determining to distribute first part and the ratio of the amount of substance of the oxygen of second section unit time, realize the distribution to the amount of substance of the oxygen of unit time by current-limiting apparatus.In the present embodiment, current-limiting apparatus comprises the first oxygen valve and the first oxygen flow meter, the second oxygen valve being arranged on the second oxygen branch road and the second oxygen flow meter that are arranged on the first oxygen branch road.By to the control of the first oxygen valve and the second oxygen valve and the observation to the first oxygen flow meter and the second oxygen flow meter, the proportional distribution oxygen by setting can be realized.And oxygen corresponding to first part mixes with cold air, then makes oxygen and cold air mix and heat through hotblast stove, finally the oxygen mixed and cold air is passed into the air port of blast furnace; Nitrogen becomes mixed gas by the oxygen mix that nitrogen branch road is corresponding with second section, and the ratio of the amount of substance of the nitrogen oxygen corresponding with second section experimentally draws with experience, and improve the content of oxygen in mixed gas as much as possible when ensureing safety.Nitrogen branch road is provided with nitrogen valve and nitrogen gas stream gauge.Whether staff by the amount of substance of nitrogen valve gate control unit time by the nitrogen of nitrogen branch road, and can be realized by the effect of observing the access control of nitrogen gas stream gauge.Then mixed mixed gas is stored in the tuyere zone also being added blast furnace in mixed gas tank after mixed gas tank mixes by sleeve pipe coal spouting gun.
Step S30: adjusted in described mixed gas by the described amount of substance of oxygen of the second oxygen branch road and the ratio of the amount of substance of nitrogen by the current-limiting apparatus being arranged on described first oxygen branch road, described second oxygen branch road and described nitrogen branch road.In the present embodiment, after preliminary adjustment in step S20, again by regulating total oxygen valve, the first oxygen valve, the second oxygen valve and nitrogen valve, the unit time is made to equal to determine the amount of substance of the oxygen needed for the injecting coal quantity size of the pulverized coal injection in blast furnace that perfect combustion is determined by the amount of substance of the oxygen of total oxygen valve; Unit time equals the amount of substance of the oxygen needed for the injecting coal quantity size of the pulverized coal injection in blast furnace that perfect combustion is determined by the amount of substance of the oxygen of the first oxygen valve and unit time by the amount of substance sum of the oxygen of the second oxygen valve; Unit time is the value that set with the unit time by the ratio of the amount of substance of the oxygen of the second oxygen valve by the amount of substance of the oxygen of the first oxygen valve; Unit time is the value that set with the unit time by the ratio of the amount of substance of the oxygen of nitrogen valve by the amount of substance of the oxygen of the second oxygen valve.
Provided by the inventionly a kind ofly provide the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, by being divided into two-way by with the amount of substance of oxygen needed for the injecting coal quantity size corresponding unit time of pulverized coal injection in blast furnace, one tunnel mixes with cold wind and after hot-air system, enters the tuyere zone of blast furnace, to make in mixed gas oxygen level higher than the oxygen level in air, improve the oxygen concentration in hot blast, and then improve the efficiency of combustion of coal dust; Meanwhile, another road and nitrogen are mixed to form mixed gas and spray into blast furnace tuyere area by sleeve pipe coal spouting gun, oxygen content in the effect mixed gas of current-limiting apparatus can control in atmosphere on oxygen level, also improve the oxygen concentration in hot blast, and then improve the efficiency of combustion of coal dust; And by controlling the content of nitrogen in mixed gas, avoiding situation about setting off an explosion because oxygen concentration is excessive and occurring; In addition, also certain at the amount of substance of the oxygen of the injecting coal quantity size one timing input blast furnace of pulverized coal injection in blast furnace, the oxygen concentration entering blast furnace through the first oxygen branch road can reduce, and then the oxygen concentration reduced by hot-air system, decrease oxynitride and produce and cause the harm of hot-air system intergranular stress corrosion.
Embodiment two
As shown in Figure 2, what Fig. 2 provided for embodiment of the present invention two a kind ofly provides the richness of the adjustable nitrogen oxygen atmosphere of concentration to support another schematic flow sheet of technique for sleeve pipe coal spouting gun.
Wherein,
Steps A 10: is in the present embodiment consistent with the step S10 in embodiment one.
Steps A 20: is in the present embodiment consistent with the step S20 in embodiment one.
Steps A 30: is in the present embodiment consistent with the step S30 in embodiment one.
Steps A 40: the injecting coal quantity size reexamining pulverized coal injection in blast furnace, and compare with the injecting coal quantity size of initial pulverized coal injection in blast furnace.In the present embodiment, blast furnace use after may exist staff change pulverized coal injection in blast furnace injecting coal quantity size or in unartificial situation the injecting coal quantity size of pulverized coal injection in blast furnace there occurs the situation of change.Now need the injecting coal quantity size reexamining pulverized coal injection in blast furnace, and compare with the injecting coal quantity size of initial pulverized coal injection in blast furnace.In the present embodiment, if the injecting coal quantity of the result detected by injecting coal quantity detector and initial pulverized coal injection in blast furnace is varied in size, then A50 is gone to step.
Steps A 50: the injecting coal quantity size of pulverized coal injection in blast furnace increases? in the present embodiment, judge according to the result in steps A 40.If the injecting coal quantity size of pulverized coal injection in blast furnace increases, then go to step A60.If the injecting coal quantity size of pulverized coal injection in blast furnace reduces, then go to step A70.
Steps A 60: the amount of substance recalculating oxygen needed for the unit time.In the present embodiment, staff passes through the injecting coal quantity size of the pulverized coal injection in blast furnace again detected, and judges that the injecting coal quantity size of the pulverized coal injection in blast furnace again detected increases.The amount of substance of the oxygen needed for Coal Injection Amount into BF size corresponding when thus can pass through manually to calculate perfect combustion.Concrete, the amount of substance of oxygen required when first all generating carbonic acid gas according to carbon perfect combustion, then rule of thumb revises the amount of substance of required oxygen.Or by computer system, draw the amount of substance of required oxygen according to the algorithm pre-set.
Steps A 80: the amount of substance recalculating oxygen needed for the unit time described in foundation, controls described first oxygen branch road, described second oxygen branch road and described nitrogen branch road to recalculate the amount of substance of oxygen needed for the unit time to blast furnace input.In the present embodiment, according to the amount and the nitrogen amount of substance that recalculate the amount of substance of oxygen needed for unit time of obtaining, amount and the ratio of the amount of the oxygen species through the second oxygen branch road through the oxygen species of the first oxygen branch road, the amount through the oxygen species of the second oxygen branch road and the ratio of the nitrogen amount of substance through nitrogen branch road redistribute total oxygen species.Wherein the amount of total oxygen species is by total oxygen branch road.Total oxygen branch road is provided with total oxygen flow meter and total oxygen valve, and total oxygen branch road is communicated with the first oxygen branch road and the second oxygen branch road simultaneously.Concrete, can by controlling total oxygen valve, the first oxygen valve, the second oxygen valve and nitrogen gas stream gauge, and observe total oxygen flow meter, the first oxygen flow meter, the second oxygen flow take into account nitrogen flow meter and realize.
Be understandable that, complete the amount of substance recalculating oxygen needed for the unit time, and after again redistributing according to certain distribution principle, again return steps A 40 at set intervals, by artificial or again detected the injecting coal quantity size of pulverized coal injection in blast furnace by computer system, and compare with the injecting coal quantity size of initial pulverized coal injection in blast furnace.
Steps A 70: the amount of substance recalculating oxygen needed for the unit time.In the present embodiment, staff passes through the injecting coal quantity size of the pulverized coal injection in blast furnace again detected, and judges that the injecting coal quantity size of the pulverized coal injection in blast furnace again detected reduces.The amount of substance of the oxygen needed for Coal Injection Amount into BF size corresponding when thus can pass through manually to calculate perfect combustion.Concrete, the amount of substance of oxygen required when first all generating carbonic acid gas according to carbon perfect combustion, then rule of thumb revises the amount of substance of required oxygen.Or by computer system, draw the amount of substance of required oxygen according to the algorithm pre-set.
Steps A 90: the amount of substance recalculating oxygen needed for the unit time described in foundation, the amount of substance controlling described first oxygen branch road, described second oxygen branch road and described nitrogen branch road reduction oxygen accounts for the ratio of the amount of substance of described mixed gas.In the present embodiment, according to the amount and the nitrogen amount of substance that recalculate the amount of substance of oxygen needed for unit time of obtaining, amount and the ratio of the amount of the oxygen species through the second oxygen branch road through the oxygen species of the first oxygen branch road, the amount through the oxygen species of the second oxygen branch road and the ratio of the nitrogen amount of substance through nitrogen branch road redistribute total oxygen species.Meanwhile change the coupled logical nitrogen amount of substance through nitrogen branch road according to the amount of the oxygen species through the second oxygen branch road after change, and nitrogen is accounted for reduced by nitrogen and the ratio of mixed gas that forms through the second oxygen branch road, namely suppose that the original unit time nitrogen amount of substance by nitrogen branch road is a with the unit time through the ratio of the amount of the second oxygen branch road oxygen species, according to described in recalculate oxygen needed for the unit time amount of substance change after unit time nitrogen be b with the unit time through the ratio of the amount of the second oxygen branch road oxygen species by the amount of substance of nitrogen branch road, a is less than b.
Be understandable that, complete the amount of substance recalculating oxygen needed for the unit time, and after again redistributing according to certain distribution principle, again return steps A 40 at set intervals, by artificial or again detected the injecting coal quantity size of pulverized coal injection in blast furnace by computer system, and compare with the injecting coal quantity size of initial pulverized coal injection in blast furnace.
Provided by the inventionly a kind ofly provide the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, by setting up at the first oxygen branch road, by after the amount of substance of oxygen of the second oxygen branch road and the ratio of the amount of substance of nitrogen in the current-limiting apparatus adjustment mixed gas of the second oxygen branch road and nitrogen branch road, again the injecting coal quantity size of pulverized coal injection in blast furnace is detected, and reset the oxygen of unit time by the first oxygen branch road according to the result detected, unit time is by the oxygen of the second oxygen branch road and the unit time nitrogen by nitrogen branch road, greatly strengthen as sleeve pipe coal spouting gun provides the stability of the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration and applicable scope and handiness, meanwhile, by increasing the amount of substance of unit time by the oxygen of the second oxygen branch road, strengthening the effect of sleeve pipe coal spouting gun further, promoting the Homogeneous phase mixing of coal dust and oxygen further, improve the efficiency of combustion of coal dust, when the injecting coal quantity size of pulverized coal injection in blast furnace reduces, reduce the ratio that the amount of oxygen species accounts for the amount of substance of mixed gas, thus the problem avoiding the sleeve pipe coal spouting gun rifle head temperature that causes because injecting coal quantity is less too high occurs.
Embodiment three
As a kind of structural representation providing the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun that Fig. 3, Fig. 3 provide for embodiment of the present invention three.
Provided by the inventionly a kind ofly providing the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, comprising detection module: be connected with the nozzle of pulverized coal injection in blast furnace, for detecting the injecting coal quantity size of pulverized coal injection in blast furnace; Computing module: be connected with detection module, the amount of substance of oxygen needed for the injecting coal quantity size Units of Account time of the pulverized coal injection in blast furnace of detection module detection; Hot blast module: comprise the first oxygen branch road and hot-air system, the first oxygen branch road is connected with hot-air system, and hot-air system is connected with blast furnace; Mixed gas module: comprise the second oxygen branch road, nitrogen branch road, mixed gas tank 13 and sleeve pipe coal spouting gun 14, one end of second oxygen branch road is communicated with the first oxygen branch road, the other end of the second oxygen branch road is communicated with nitrogen branch road, the end that second oxygen branch road is communicated with nitrogen branch road is communicated with mixed gas tank 13, mixed gas tank 13 is connected with sleeve pipe coal spouting gun 14, and sleeve pipe coal spouting gun 14 is arranged on blast furnace 15; Current-limiting apparatus: comprise the first flow-restriction, the second flow-restriction and the 3rd flow-restriction, the first flow-restriction is arranged on the first oxygen branch road, and the second flow-restriction is arranged on the second oxygen branch road, and the 3rd flow-restriction is arranged on nitrogen branch road.
Concrete, first oxygen flow meter 5 and the first oxygen valve 4 are successively set on the first oxygen branch road and after hotblast stove 7 is arranged on the first oxygen flow meter 5 and the first oxygen valve 4, first oxygen flow meter 5 is connected with hotblast stove 7, and hotblast stove 7 is communicated with the air port of blast furnace 15.Second oxygen valve 16 and the second oxygen flow meter 17 are successively set on the second oxygen branch road.One end of first oxygen branch road is communicated with formation joint portion with one end of the second oxygen branch road, and make oxygen 1 can flow through the first oxygen branch road and the second oxygen branch road by joint portion simultaneously, and making oxygen 1 can through while the first oxygen flow meter 5 being positioned at the first oxygen branch road and the first oxygen valve 4, oxygen 1 can through the second oxygen flow meter 17 and the second oxygen valve 16 being positioned at the second oxygen branch road.In the present embodiment, what be communicated with joint portion is total oxygen branch road, and total oxygen branch road is provided with total oxygen flow meter 3 and total oxygen valve 2.As shown in Figure 3, the second oxygen flow meter 17 on second oxygen branch road is communicated with nitrogen branch road, nitrogen branch road is provided with nitrogen gas stream gauge 11 and nitrogen valve 10 successively, one end of nitrogen branch road is communicated with away from one end, total oxygen branch road direction with the second oxygen branch road as shown in Figure 3, and by being stored in after mixed gas valve 12 in mixed gas tank 13 after making the oxygen 1 through the second oxygen branch road mix with the nitrogen 9 through nitrogen branch road.Mixed gas tank 13 is connected with sleeve pipe coal spouting gun 14, and the mixed gas being stored in mixed gas tank 13 can spray into the air port of blast furnace 15 by sleeve pipe coal spouting gun 14.
Be understandable that, also judge module is comprised in present embodiment, judge module is connected with computing module, detection module and control module respectively, and when judge module brings into operation for the injecting coal quantity size of pulverized coal injection in blast furnace after judging operation of blast furnace and blast furnace, whether the injecting coal quantity size of pulverized coal injection in blast furnace changes.If change, then the computing module that is attached thereto calculates the amount of substance of oxygen needed for unit time corresponding to the injecting coal quantity size of the pulverized coal injection in blast furnace after change; Control module for controlling the first oxygen valve, the second oxygen valve and nitrogen valve so that the amount of substance changing oxygen accounts for the ratio of the amount of substance of mixed gas.
Be understandable that, total oxygen valve 2, first oxygen valve 4, second oxygen valve 16 in present embodiment and nitrogen valve 10 are all controlled by control module.In the present embodiment, control module, for controlling total oxygen valve 2, first oxygen valve 4, second oxygen valve 16 and nitrogen valve 10, makes oxygen 1 unit time controlled by uninterrupted when total oxygen valve 2, first oxygen valve 4, second oxygen valve 16 and nitrogen valve 10.
The operation scheme of the device of the adjustable nitrogen oxygen atmosphere of concentration is provided to further be interpreted as sleeve pipe coal spouting gun, its use-pattern is expressed as follows:
First the injecting coal quantity size of pulverized coal injection in blast furnace corresponding is with it set according to the needs produced, then examination spray is carried out, detection module detects the actual size of blast furnace nozzle ejection coal dust amount, in the present embodiment, is detected the actual size of blast furnace nozzle ejection coal dust amount by injecting coal quantity detector.After the blast furnace nozzle that the computer system be connected with injecting coal quantity detector receives detection sprays the actual size of coal dust amount, by preset algorithm, calculate the amount of substance of oxygen needed for the unit time corresponding with it, the blast furnace nozzle ejection coal dust amount that is promoting actual measurement to go out needs to provide the amount of substance of oxygen needed for the unit time in theory.
Then aborning, control total oxygen valve 2 and observe total oxygen flow meter 3, making the unit time pass through the amount of substance of the oxygen 1 of total oxygen branch road consistent with the amount of substance of oxygen 1 needed for the unit time calculated.Oxygen 1 is divided into two portions when the joint portion of arrival first oxygen branch road and the second oxygen branch road, and a part enters hotblast stove 7 after the first oxygen flow meter 5 and the first oxygen valve 4, finally enters the air port 8 of blast furnace; Another road mixes with the nitrogen 9 through nitrogen branch road after the second oxygen flow meter 17 and the second oxygen valve 16.The ratio of the oxygen 1 wherein entering the first oxygen branch road and the oxygen 1 entering the second oxygen branch road is by the first oxygen valve 4 and realized the second coordinating of oxygen valve 16, and the oxygen 1 entering the first oxygen branch road can according to testing or practical situation and setting with the ratio of ratio of the oxygen 1 entering the second oxygen branch road.In addition, the oxygen 1 entering the second oxygen branch road mixes with the nitrogen 9 entering nitrogen branch road, the ratio of the oxygen 1 entering the second oxygen branch road in mixed mixed gas and the nitrogen 9 entering nitrogen branch road, can determine according to testing data and practical situation, and improve the content of oxygen in mixed gas as much as possible under the prerequisite of use safety ensureing sleeve pipe coal spouting gun 14.Mixed mixed gas is stored in mixed gas tank 13 after mixed gas valve 12, so that the mixed gas mixed is sprayed into the air port of blast furnace by sleeve pipe coal spouting gun 14 with certain pressure.
Provided by the inventionly a kind ofly provide the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, hot blast module and mixed gas module are set simultaneously, the amount of substance of oxygen needed for unit time corresponding for injecting coal quantity size with pulverized coal injection in blast furnace is divided into two portions, a part to mix with cold wind through hot blast module and heats, improve the oxygen concentration in cold wind, and then improve the efficiency of combustion of coal dust; Meanwhile, another part is mixed to form mixed gas through mixed gas module and nitrogen, by a nitrogen content in restriction mixed gas, make the oxygen content in mixed gas can control in atmosphere on oxygen level, also improve the oxygen concentration in hot blast, and then improve the efficiency of combustion of coal dust; Therefore the amount of substance being divided into oxygen needed for the two-part unit time all improves the oxygen concentration of hot-air mouth, improves the efficiency of combustion of coal dust; And by controlling the content of nitrogen in mixed gas, improve the content of the air port place oxygen of blast furnace under avoiding the prerequisite of the situation generation that set off an explosion because oxygen concentration is excessive as much as possible, improve the efficiency of combustion of coal dust; In addition, unit time is certain by the oxygen of hot blast module and mixed gas module, when the part of oxygen that mixed gas module is divided, the oxygen concentration of the hot-air system in hot blast module comparatively only has during hot blast module and reduces, and decreases oxynitride and produces and the harm that causes hot-air system intergranular stress corrosion; Current-limiting apparatus is controlled by control module, reach and changed flexibly the unit time through the oxygen of the first oxygen branch road, the nitrogen of unit time through the oxygen of the second oxygen branch road and unit time through nitrogen branch road, greatly strengthen stability for sleeve pipe coal spouting gun provides the device of the adjustable nitrogen oxygen atmosphere of concentration to produce and applicable scope and handiness.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1., for sleeve pipe coal spouting gun provides an oxygen enriching process for the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that, comprise the steps:
Step a: according to the injecting coal quantity size of pulverized coal injection in blast furnace, the amount of substance of oxygen needed for the Units of Account time;
Step b: the amount of substance of oxygen needed for the described unit time is entered the tuyere zone of described blast furnace respectively simultaneously by the first oxygen branch road and the second oxygen branch road, to be mixed with cold wind by the oxygen of described first oxygen branch road and after the hot-air system of described blast furnace, enter the tuyere zone of described blast furnace, by the oxygen of described second oxygen branch road be mixed to form mixed gas by the nitrogen of nitrogen branch road and enter the tuyere zone of described blast furnace through the sleeve pipe coal spouting gun be arranged on blast furnace;
Step c: adjusted in described mixed gas by the described amount of substance of oxygen of the second oxygen branch road and the ratio of the amount of substance of nitrogen by the current-limiting apparatus being arranged on described first oxygen branch road, described second oxygen branch road and described nitrogen branch road;
Steps d: the injecting coal quantity size detecting described pulverized coal injection in blast furnace, if the injecting coal quantity size of described pulverized coal injection in blast furnace increases, then recalculate the amount of substance of oxygen needed for the unit time, and described in foundation, recalculate the amount of substance of oxygen needed for the unit time, control described first oxygen branch road, described second oxygen branch road and described nitrogen branch road to recalculate the amount of substance of oxygen needed for the unit time to blast furnace input; If the injecting coal quantity size of described pulverized coal injection in blast furnace reduces, then recalculate the amount of substance of oxygen needed for the unit time, and described in foundation, recalculating the amount of substance of oxygen needed for the unit time, the amount of substance controlling described first oxygen branch road, described second oxygen branch road and described nitrogen branch road reduction oxygen accounts for the ratio of the amount of substance of described mixed gas.
2. as claimed in claim 1 for sleeve pipe coal spouting gun provides the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that, described recalculate the amount of substance of oxygen needed for the unit time after also comprise according to described in recalculate oxygen needed for the unit time amount of substance increase the unit time by the amount of substance of the oxygen of the second oxygen branch road, reduce the amount of substance of unit time by the oxygen of the first oxygen branch road, and make the unit time to be equaled by the amount of substance sum of the oxygen of the second oxygen branch road by the amount of substance of the oxygen of the first oxygen branch road and unit time described in recalculate the amount of substance of oxygen needed for the unit time.
3. as described in any one of claim 1 to 2, provide the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, it is characterized in that: described current-limiting apparatus comprises the first oxygen valve of being arranged on described first oxygen branch road and the first oxygen flow meter, the second oxygen valve being arranged on described second oxygen branch road and the second oxygen flow take into account the nitrogen valve and nitrogen gas stream gauge that are arranged on described nitrogen branch road.
4., as claimed in claim 3 for sleeve pipe coal spouting gun provides the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that, described mixed gas is stored in mixed gas tank, and described mixed gas tank is connected with described sleeve pipe coal spouting gun.
5., for sleeve pipe coal spouting gun provides a device for the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that, comprise
Detection module: be connected with the nozzle of pulverized coal injection in blast furnace, for detecting the injecting coal quantity size of pulverized coal injection in blast furnace;
Computing module: be connected with described detection module, the amount of substance of oxygen needed for the injecting coal quantity size Units of Account time of the pulverized coal injection in blast furnace detected according to described detection module;
Hot blast module: comprise the first oxygen branch road and hot-air system, described first oxygen branch road is connected with described hot-air system, and described hot-air system is connected with described blast furnace;
Mixed gas module: comprise the second oxygen branch road, nitrogen branch road, mixed gas tank and sleeve pipe coal spouting gun, one end of described second oxygen branch road is communicated with described first oxygen branch road, the other end of described second oxygen branch road is communicated with described nitrogen branch road, the end that described second oxygen branch road is communicated with described nitrogen branch road is communicated with described mixed gas tank, described mixed gas tank is connected with sleeve pipe coal spouting gun, and described sleeve pipe coal spouting gun is arranged on described blast furnace;
Current-limiting apparatus: comprise the first flow-restriction, the second flow-restriction and the 3rd flow-restriction, described first flow-restriction is arranged on described first oxygen branch road, described second flow-restriction is arranged on described second oxygen branch road, and described 3rd flow-restriction is arranged on described nitrogen branch road.
6. as claimed in claim 5 for sleeve pipe coal spouting gun provides the device of the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that, also comprise judge module and control module, described judge module respectively with described computing module, described detection module and described control module connect, described judge module is for judging the change of the injecting coal quantity size of pulverized coal injection in blast furnace, described computing module is for the amount of substance of oxygen needed for unit time corresponding to the injecting coal quantity size that calculates the pulverized coal injection in blast furnace after change, described control module is for controlling described first flow-restriction, described second flow-restriction and described 3rd flow-restriction are so that the amount of substance changing oxygen accounts for the ratio of the amount of substance of described mixed gas.
7. as described in any one of claim 5 or 6, provide the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, it is characterized in that: described first flow-restriction comprises the first oxygen valve and the first oxygen flow meter that are arranged on described first oxygen branch road, described second flow-restriction comprises the second oxygen valve and the second oxygen flow meter that are arranged on described second oxygen branch road, and described 3rd flow-restriction comprises the nitrogen valve and nitrogen gas stream gauge that are arranged on described nitrogen branch road.
8. as claimed in claim 7 for sleeve pipe coal spouting gun provides the device of the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that: described current-limiting apparatus also comprises total flow-restriction, the end that described first oxygen branch road is communicated with described second oxygen branch road is connected with described total flow-restriction, and described total flow-restriction comprises total oxygen flow meter and total oxygen valve.
9. as claimed in claim 8 for sleeve pipe coal spouting gun provides the device of the adjustable nitrogen oxygen atmosphere of concentration, it is characterized in that: between the end that described second oxygen branch road and described nitrogen branch road are communicated with and described mixed gas tank, be also provided with mixed gas valve.
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| CN201410337631.2A CN104099435B (en) | 2014-07-16 | 2014-07-16 | For sleeve pipe coal spouting gun provides oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201864737U (en) * | 2010-11-01 | 2011-06-15 | 中冶京诚工程技术有限公司 | Oxygen coal lance and tuyere combined device |
| CN102409122A (en) * | 2011-11-23 | 2012-04-11 | 福建三钢闽光股份有限公司 | Blast furnace oxygen adding coal injection method and apparatus thereof |
| CN103014205A (en) * | 2012-12-31 | 2013-04-03 | 中冶京诚工程技术有限公司 | Method for supplying oxygen to blast furnace oxygen-enriched coal spray |
| CN203212590U (en) * | 2013-04-19 | 2013-09-25 | 首钢京唐钢铁联合有限责任公司 | Oxygen coal gun cooling medium regulating and controlling system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201864737U (en) * | 2010-11-01 | 2011-06-15 | 中冶京诚工程技术有限公司 | Oxygen coal lance and tuyere combined device |
| CN102409122A (en) * | 2011-11-23 | 2012-04-11 | 福建三钢闽光股份有限公司 | Blast furnace oxygen adding coal injection method and apparatus thereof |
| CN103014205A (en) * | 2012-12-31 | 2013-04-03 | 中冶京诚工程技术有限公司 | Method for supplying oxygen to blast furnace oxygen-enriched coal spray |
| CN203212590U (en) * | 2013-04-19 | 2013-09-25 | 首钢京唐钢铁联合有限责任公司 | Oxygen coal gun cooling medium regulating and controlling system |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |