CN104099435A - Oxygen enrichment process and device for providing concentration-adjustable nitrogen and oxygen mixed gas to casing coal injection gun - Google Patents
Oxygen enrichment process and device for providing concentration-adjustable nitrogen and oxygen mixed gas to casing coal injection gun Download PDFInfo
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Abstract
The invention belongs to the technical field of blast furnace smelting, in particular relates to an oxygen enrichment process and a device for providing concentration-adjustable nitrogen and oxygen mixed gas to a casing coal injection gun. The substance amount of needed oxygen in a unit time is calculated according to the magnitude of the coal injection quantity of coal powder injected by a blast furnace, and is respectively fed in a wind port area of the blast furnace through a first oxygen branch and a second oxygen branch; and the ratio of the substance amount of the oxygen passing through the second oxygen branch to the substance quantity of nitrogen in the mixed gas is adjusted through current limiting devices arranged on the first oxygen branch, the second oxygen branch and a nitrogen branch. The substance quantity of the oxygen corresponding to the magnitude of the coal injection quantity of the coal powder injected by the blast furnace is divided into two ways, wherein one way is passed through a hot wind module, and the other way is mixed with the nitrogen and fed in the blast furnace through the casing coal injection gun, so that the concentration of the oxygen in the wind port area is increased, and the combustion efficiency of the coal powder is improved under the precondition of guaranteeing the safety.
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 social development, 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 that improves 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 by coke and burns and the obnoxious flavour that produces becomes the problem that those skilled in the art are devoted to research.
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.Yet along with injecting coal quantity increases, the theoretical combustion temperature in convolution district, air port can constantly reduce, and is unfavorable for the smelting of blast furnace, need carry out heat compensation to tuyere zone.The method of compensation is generally following two kinds: a kind of is that wind-warm syndrome that tuyere zone is provided by providing realizes tuyere zone heat is compensated; Another kind is by taking oxygen enrichment to operate, and improves the theoretical combustion temperature that the oxygen concentration entering in tuyere zone hot blast improves tuyere zone.
Yet the wind-warm syndrome adopting in industry at present has reached 1100-1250 ℃, and the cost that further improves wind-warm syndrome is higher, and realize comparatively difficulty.Therefore the oxygen concentration, improving in hot blast becomes the prefered method that compensates tuyere zone heat.Improve two kinds of modes below general employing of oxygen concentration in hot blast: the first is mixed oxygen and cold wind 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 to 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 improved coal dust utilization ratio, contribute to reduce oxygen concentration in hotblast stove, reduce nitrogen oxygen traffic and produce the harm that causes intergranular stress corrosion.Utilize the blast furnace buying expenses of sleeve pipe coal spouting gun coal powder injection higher, and in the mixed spray process of oxygen coal, highly purified oxygen contact, and has the possibility of blast, has potential safety hazard with fine powdered coal.
Therefore, need badly a kind ofly for sleeve pipe coal spouting gun provides oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration, avoiding oxygen to contact under the prerequisite of blasting and improve oxygen enrichment percentage 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 of the potential safety hazard of bringing at elimination use sleeve pipe coal spouting gun, improve oxygen concentration in hot blast, and then the theoretical combustion temperature of raising tuyere zone, the efficiency of combustion of raising coal.
For solving the problems of the technologies described above, the invention provides a kind ofly for sleeve pipe coal spouting gun provides the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration, comprise the steps:
Step a: according to the injecting coal quantity size of pulverized coal injection in blast furnace, the amount of substance of required oxygen of Units of Account time;
Step b: the amount of substance of described required oxygen of unit time is entered respectively to the tuyere zone of described blast furnace simultaneously by the first oxygen branch road and the second oxygen branch road, oxygen by described the first oxygen branch road mixes and enters after the hot-air system of described blast furnace the tuyere zone of described blast furnace with cold wind, the oxygen by described the second oxygen branch road and nitrogen by nitrogen branch road are mixed to form mixed gas and through being arranged on sleeve pipe coal spouting gun on blast furnace, enter the tuyere zone of described blast furnace;
Step c: adjust in described mixed gas by the amount of substance of oxygen of described the second oxygen branch road and the ratio of the amount of substance of nitrogen by being arranged on the current-limiting apparatus of described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road.
Further, after described step c, also comprise
Steps d: the injecting coal quantity size that detects described pulverized coal injection in blast furnace, if the injecting coal quantity of described pulverized coal injection in blast furnace size increases, recalculate the amount of substance of required oxygen of unit time, and according to described in recalculate the amount of substance of required oxygen of unit time, control described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road to recalculate the amount of substance of required oxygen of unit time to blast furnace input; If the injecting coal quantity size of described pulverized coal injection in blast furnace reduces, recalculate the amount of substance of required oxygen of unit time, and according to described in recalculate the amount of substance of required oxygen of unit time, control the ratio that amount of substance that described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road reduce oxygen accounts for the amount of substance of described mixed gas.
Further, after the described amount of substance that recalculates required oxygen of unit time, also comprise according to described in recalculate required oxygen of 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 unit time by the amount of substance of the oxygen of the first oxygen branch road, and make the amount of substance of unit time by the oxygen of the first oxygen branch road and the unit time amount of substance sum by the oxygen of the second oxygen branch road recalculate the amount of substance of required oxygen of unit time described in equaling.
Further, described current-limiting apparatus comprises that being arranged on the first oxygen valve and first oxygen flow meter of described the first oxygen branch road, the second oxygen valve that is arranged on described the second oxygen branch road and the second oxygen flow takes into account nitrogen valve and the nitrogen flow meter that is 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.
With respect 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 the amount of substance of the corresponding required oxygen of unit time of injecting coal quantity size with pulverized coal injection in blast furnace is divided into two-way, the tuyere zone of blast furnace is mixed and is entered after hot-air system on one tunnel with cold wind, make in mixed gas oxygen level higher than airborne oxygen level, improve the oxygen concentration in hot blast, and then improved 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 be controlled in air on oxygen level, also improve the oxygen concentration in hot blast, and then improved the efficiency of combustion of coal dust; And by nitrogen the content in mixed gas control, avoided situation about setting off an explosion because oxygen concentration is excessive to occur; In addition, the amount of substance of oxygen of regularly inputting blast furnace in the injecting coal quantity size one of pulverized coal injection in blast furnace is also certain, the oxygen concentration that enters blast furnace through the first oxygen branch road can reduce, and then reduced the oxygen concentration by hot-air system, reduced that oxynitride produces and the harm that causes hot-air system intergranular stress corrosion.
It is a kind of for sleeve pipe coal spouting gun provides the device of the adjustable nitrogen oxygen atmosphere of concentration that the present invention also further provides, and comprises detection module: be connected with the nozzle of pulverized coal injection in blast furnace, for detection of the injecting coal quantity size of pulverized coal injection in blast furnace; Computing module: be connected the amount of substance of the injecting coal quantity size required oxygen of Units of Account time of the pulverized coal injection in blast furnace detecting according to described detection module with described detection module; Hot blast module: comprise the first oxygen branch road and hot-air system, described the 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 the second oxygen branch road is communicated with described the first oxygen branch road, the other end of described the second oxygen branch road is communicated with described nitrogen branch road, the end that described the 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 current limliting unit, the second current limliting unit and the 3rd current limliting unit, described the first current limliting unit is arranged on described the first oxygen branch road, described the second current limliting unit is arranged on described the second oxygen branch road, and described the 3rd current limliting unit 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 variation of the injecting coal quantity size of pulverized coal injection in blast furnace, described computing module is for calculating the amount of substance of the big or small corresponding required oxygen of unit time of injecting coal quantity of the pulverized coal injection in blast furnace after variation, described control module is used for controlling described the first current limliting unit, described the second current limliting unit and described the 3rd current limliting unit are to change the ratio that the amount of substance of oxygen accounts for the amount of substance of described mixed gas.
Further, described the first current limliting unit comprises the first oxygen valve and the first oxygen flow meter that is arranged on described the first oxygen branch road, described the second current limliting unit comprises the second oxygen valve and the second oxygen flow meter that is arranged on described the second oxygen branch road, and described the 3rd current limliting unit comprises nitrogen valve and the nitrogen flow meter that is arranged on described nitrogen branch road.
Further, described current-limiting apparatus also comprises total current limliting unit, and described the first oxygen branch road is connected with described total current limliting unit with the end that described the second oxygen branch road is communicated with, and described total current limliting unit comprises total oxygen flow meter and total oxygen valve.
Further, between the end that described the second oxygen branch road and described nitrogen branch road are communicated with and described mixed gas tank, be also provided with mixed gas valve.
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 hot blast module and mixed gas module are set simultaneously, the amount of substance of the big or small corresponding required oxygen of unit time of the injecting coal quantity with pulverized coal injection in blast furnace is divided into two portions, a part is mixed with cold wind through hot blast module and heats, improve the oxygen concentration in cold wind, and then improved 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, oxygen content in mixed gas can be controlled in air on oxygen level, also improve the oxygen concentration in hot blast, and then improved the efficiency of combustion of coal dust; Therefore the amount of substance that is divided into two-part required oxygen of unit time has all improved the oxygen concentration of hot-air mouth, has improved the efficiency of combustion of coal dust; And by nitrogen the content in mixed gas control, avoided situation about setting off an explosion because oxygen concentration is excessive to occur; In addition, the oxygen of unit time by hot blast module and mixed gas module is certain, when part of oxygen that mixed gas module is divided, the oxygen concentration of the hot-air system in hot blast module reduces while only having hot blast module, reduced that oxynitride 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, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 a kind ofly supports the schematic flow sheet of technique for sleeve pipe coal spouting gun provides the richness of the adjustable nitrogen oxygen atmosphere of concentration for what embodiment of the present invention one provided;
Fig. 2 a kind ofly supports another schematic flow sheet of technique for sleeve pipe coal spouting gun provides the richness of the adjustable nitrogen oxygen atmosphere of concentration for what embodiment of the present invention two provided;
Fig. 3 a kind ofly provides the structural representation of the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun for what embodiment of the present invention three provided.
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 flow meter; 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, the technical scheme in embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain, all belongs to the scope of protection of the invention.
Embodiment one
As shown in Figure 1, Fig. 1 a kind ofly supports the schematic flow sheet of technique for sleeve pipe coal spouting gun provides the richness of the adjustable nitrogen oxygen atmosphere of concentration for what embodiment of the present invention one provided.
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 required oxygen of Units of Account time.In the present embodiment, relevant staff is according to the injecting coal quantity size that need to determine pulverized coal injection in blast furnace of producing.During then according to the injecting coal quantity size of definite pulverized coal injection in blast furnace and carbon and oxygen perfect combustion, the proportioning of carbon oxygen is calculated, and obtains the amount of substance of the big or small required oxygen of injecting coal quantity of the definite pulverized coal injection in blast furnace of perfect combustion.Then according to practical situation, the amount of substance of required oxygen is revised.
Be understandable that, can be manually to calculate when the amount of substance of the required oxygen of the injecting coal quantity size of determining the pulverized coal injection in blast furnace that perfect combustion is definite, can be also 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 it is big or small that injecting coal quantity detector can detect the injecting coal quantity 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 be accepted the injecting coal quantity size data of the pulverized coal injection in blast furnace of injecting coal quantity detector detection, and according to the related algorithm of the amount of substance of the required oxygen of the injecting coal quantity size of the definite pulverized coal injection in blast furnace of the calculating perfect combustion setting in advance, draw the amount of substance of the oxygen that injecting coal quantity size unit time of the pulverized coal injection in blast furnace that perfect combustion is definite is required.
Step S20: the amount of substance of described required oxygen of unit time is entered respectively to the tuyere zone of described blast furnace simultaneously by the first oxygen branch road and the second oxygen branch road, oxygen by described the first oxygen branch road mixes and enters after the hot-air system of described blast furnace the tuyere zone of described blast furnace with cold wind, the oxygen by described the second oxygen branch road and nitrogen by nitrogen branch road are mixed to form mixed gas and through being arranged on sleeve pipe coal spouting gun on blast furnace, enter the tuyere zone of described blast furnace.In the present embodiment, the amount of substance of the required oxygen of the injecting coal quantity size of the definite pulverized coal injection in blast furnace of the perfect combustion calculating 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 required oxygen of the injecting coal quantity size of the definite pulverized coal injection in blast furnace of perfect combustion.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.Determine to distribute after the ratio of first part and the amount of substance of the oxygen of second section unit time, by current-limiting apparatus, realize the distribution to the amount of substance of the oxygen of unit time.In the present embodiment, current-limiting apparatus comprises and is arranged on the first oxygen valve and first oxygen flow meter of the first oxygen branch road, the second oxygen valve that is arranged on the second oxygen branch road and the second oxygen flow meter.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, can realize by the proportional distribution oxygen of setting.And oxygen corresponding to first part mixes with cold air, then make oxygen and cold air mix and heat through hotblast stove, finally the oxygen mixing and cold air are passed into the air port of blast furnace; Nitrogen becomes mixed gas by the nitrogen branch road oxygen mix corresponding with second section, and the beguine of the amount of substance of the oxygen that nitrogen is corresponding with second section is tested factually with experience and is drawn, and in guaranteeing to improve mixed gas as much as possible safe in the situation that the content of oxygen.On nitrogen branch road, be provided with nitrogen valve and nitrogen flow meter.Whether staff can pass through by the nitrogen valve gate control unit time amount of substance of the nitrogen of nitrogen branch road, and realize by observing the effect of nitrogen flow meter access control.Then mixed mixed gas is stored in to the tuyere zone that also adds blast furnace in mixed gas tank after mixed gas tank mixes by sleeve pipe coal spouting gun.
Step S30: adjust in described mixed gas by the amount of substance of oxygen of described the second oxygen branch road and the ratio of the amount of substance of nitrogen by being arranged on the current-limiting apparatus of described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road.In the present embodiment, after the preliminary adjustment in step S20, again, by regulating total oxygen valve, the first oxygen valve, the second oxygen valve and nitrogen valve, make the unit time by the amount of substance of the oxygen of total oxygen valve, equal the amount of substance of the big or small required oxygen of injecting coal quantity of the definite pulverized coal injection in blast furnace of definite perfect combustion; Amount of substance and the unit time of unit time by the oxygen of the first oxygen valve equals the amount of substance of the big or small required oxygen of injecting coal quantity of the definite pulverized coal injection in blast furnace of perfect combustion by the amount of substance sum of the oxygen of the second oxygen valve; The value of the amount of substance of the oxygen of unit time by the first oxygen valve and the unit time ratio by the amount of substance of the oxygen of the second oxygen valve for setting; The value of the amount of substance of the oxygen of unit time by the second oxygen valve and the unit time ratio by the amount of substance of the oxygen of nitrogen valve for setting.
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 the amount of substance of the corresponding required oxygen of unit time of injecting coal quantity size with pulverized coal injection in blast furnace is divided into two-way, the tuyere zone of blast furnace is mixed and is entered after hot-air system on one tunnel with cold wind, make in mixed gas oxygen level higher than airborne oxygen level, improve the oxygen concentration in hot blast, and then improved 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 be controlled in air on oxygen level, also improve the oxygen concentration in hot blast, and then improved the efficiency of combustion of coal dust; And by nitrogen the content in mixed gas control, avoided situation about setting off an explosion because oxygen concentration is excessive to occur; In addition, the amount of substance of oxygen of regularly inputting blast furnace in the injecting coal quantity size one of pulverized coal injection in blast furnace is also certain, the oxygen concentration that enters blast furnace through the first oxygen branch road can reduce, and then reduced the oxygen concentration by hot-air system, reduced that oxynitride produces and the harm that causes hot-air system intergranular stress corrosion.
Embodiment two
As shown in Figure 2, Fig. 2 a kind ofly supports another schematic flow sheet of technique for sleeve pipe coal spouting gun provides the richness of the adjustable nitrogen oxygen atmosphere of concentration for what embodiment of the present invention two provided.
Wherein,
Steps A 10: in the present embodiment, consistent with the step S10 in embodiment one.
Steps A 20: in the present embodiment, consistent with the step S20 in embodiment one.
Steps A 30: in the present embodiment, consistent with the step S30 in embodiment one.
Steps A 40: reexamine the injecting coal quantity size of 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, after blast furnace is used, may exist staff to change the injecting coal quantity size of pulverized coal injection in blast furnace or in unartificial situation the injecting coal quantity size of pulverized coal injection in blast furnace there is situation about changing.Now need to reexamine the injecting coal quantity size of 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 detecting by injecting coal quantity detector and initial pulverized coal injection in blast furnace varies in size, go to step A50.
Steps A 50: the injecting coal quantity size of pulverized coal injection in blast furnace increases? in the present embodiment, according to the result judgement in steps A 40.If the injecting coal quantity of pulverized coal injection in blast furnace size increases, go to step A60.If the injecting coal quantity size of pulverized coal injection in blast furnace reduces, go to step A70.
Steps A 60: the amount of substance that recalculates required oxygen of unit time.In the present embodiment, staff is by the injecting coal quantity size of the pulverized coal injection in blast furnace that again detects, and the injecting coal quantity size of judging the pulverized coal injection in blast furnace again detecting increases.Thereby the amount of substance of the required oxygen of Coal Injection Amount into BF that can be corresponding when manually calculating perfect combustion size.Concrete, while first all generating carbonic acid gas according to carbon perfect combustion, the amount of substance of required oxygen, then rule of thumb revises the amount of substance of required oxygen.Or by computer system, according to the algorithm setting in advance, draw the amount of substance of required oxygen.
Steps A 80: recalculate the amount of substance of required oxygen of unit time described in foundation, control described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road to recalculate the amount of substance of required oxygen of unit time to blast furnace input.In the present embodiment, according to recalculating the amount of substance of the required oxygen of unit time obtaining, through the ratio of the oxygen amount of substance of the first oxygen branch road and oxygen amount of substance through the second oxygen branch road, redistribute total oxygen amount of substance and nitrogen amount of substance through the oxygen amount of substance of the second oxygen branch road and the ratio of nitrogen amount of substance through nitrogen branch road.Wherein total oxygen amount of substance 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 be by controlling total oxygen valve, the first oxygen valve, the second oxygen valve and nitrogen flow meter, and observe total oxygen flow meter, the first oxygen flow meter, the second oxygen flow and take into account nitrogen flow meter and realize.
Be understandable that, complete the amount of substance that recalculates required oxygen of unit time, and after again redistributing according to certain distribution principle, again return at set intervals steps A 40, by artificial or again detect 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 that recalculates required oxygen of unit time.In the present embodiment, staff is by the injecting coal quantity size of the pulverized coal injection in blast furnace that again detects, and the injecting coal quantity size of judging the pulverized coal injection in blast furnace again detecting reduces.Thereby the amount of substance of the required oxygen of Coal Injection Amount into BF that can be corresponding when manually calculating perfect combustion size.Concrete, while first all generating carbonic acid gas according to carbon perfect combustion, the amount of substance of required oxygen, then rule of thumb revises the amount of substance of required oxygen.Or by computer system, according to the algorithm setting in advance, draw the amount of substance of required oxygen.
Steps A 90: recalculate the amount of substance of required oxygen of unit time described in foundation, the amount of substance of controlling described the first oxygen branch road, described the 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 recalculating the amount of substance of the required oxygen of unit time obtaining, through the ratio of the oxygen amount of substance of the first oxygen branch road and oxygen amount of substance through the second oxygen branch road, redistribute total oxygen amount of substance and nitrogen amount of substance through the oxygen amount of substance of the second oxygen branch road and the ratio of nitrogen amount of substance through nitrogen branch road.Meanwhile according to the oxygen amount of substance through the second oxygen branch road after changing, change the coupled logical nitrogen amount of substance through nitrogen branch road, and the ratio that nitrogen is accounted for by nitrogen and the mixed gas that forms through the second oxygen branch road reduces, suppose that original unit's time nitrogen is a with the unit time through the ratio of the second oxygen branch road oxygen amount of substance by the amount of substance of nitrogen branch road, according to described in recalculate required oxygen of unit time the amount of substance of the unit time nitrogen of amount of substance after changing by nitrogen branch road through the ratio of the second oxygen branch road oxygen amount of substance, be b with the unit time, a is less than b.
Be understandable that, complete the amount of substance that recalculates required oxygen of unit time, and after again redistributing according to certain distribution principle, again return at set intervals steps A 40, by artificial or again detect 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, the current-limiting apparatus of the second oxygen branch road and nitrogen branch road is adjusted in mixed gas by after the amount of substance of oxygen of the second oxygen branch road and the ratio of the amount of substance of nitrogen, again detect the injecting coal quantity size of pulverized coal injection in blast furnace, and reset the unit time by the oxygen of the first oxygen branch road according to the result detecting, unit time is passed through the nitrogen of nitrogen branch road by oxygen and the unit time of the second oxygen branch road, greatly strengthened and provide the stability of oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration and applicable scope and handiness for sleeve pipe coal spouting gun, meanwhile, by increasing the unit time by the amount of substance of the oxygen of the second oxygen branch road, further strengthen the effect of sleeve pipe coal spouting gun, further promote coal dust to mix with the even of oxygen, improve the efficiency of combustion of coal dust, when the injecting coal quantity size of pulverized coal injection in blast furnace reduces, reduce oxygen amount of substance and account for the ratio of the amount of substance of mixed gas, thereby avoided occurring compared with the problem of the little sleeve pipe coal spouting gun rifle head excess Temperature causing because of injecting coal quantity.
Embodiment three
As Fig. 3, Fig. 3 a kind ofly provides the structural representation of the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun for what embodiment of the present invention three provided.
Provided by the invention a kind of for sleeve pipe coal spouting gun provides the device of the adjustable nitrogen oxygen atmosphere of concentration, comprise detection module: be connected with the nozzle of pulverized coal injection in blast furnace, for detection of the injecting coal quantity size of pulverized coal injection in blast furnace; Computing module: be connected the amount of substance of the injecting coal quantity size required oxygen of Units of Account time of the pulverized coal injection in blast furnace detecting according to detection module with detection module; 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 the 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 the 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 current limliting unit, the second current limliting unit and the 3rd current limliting unit, the first current limliting unit is arranged on the first oxygen branch road, and the second current limliting unit is arranged on the second oxygen branch road, and the 3rd current limliting unit is arranged on nitrogen branch road.
Concrete, after the first oxygen flow meter 5 and the first oxygen valve 4 are successively set on the first oxygen branch road and hotblast stove 7 is arranged on the first oxygen flow meter 5 and the first oxygen valve 4, the 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.The second oxygen valve 16 and the second oxygen flow meter 17 are successively set on the second oxygen branch road.One end of one end of the first oxygen branch road and the second oxygen branch road is communicated with formation joint portion, and make the oxygen 1 can be by joint portion flow through the first oxygen branch road and the second oxygen branch road simultaneously, and making the oxygen 1 can be when being positioned at the first oxygen flow meter 5 of the first oxygen branch road and the first oxygen valve 4, oxygen 1 can be through the second oxygen flow meter 17 and the second oxygen valve 16 that are 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 the second oxygen branch road is communicated with nitrogen branch road, nitrogen branch road is provided with nitrogen flow meter 11 and nitrogen valve 10 successively, one end of nitrogen branch road and the second oxygen branch road are communicated with away from total oxygen branch road direction one end as shown in Figure 3, and make to be stored in after by mixed gas valve 12 and to mix in gas tank 13 after nitrogen 9 through nitrogen branch road mixes through the oxygen 1 of the second oxygen branch road.Mixed gas tank 13 is connected with sleeve pipe coal spouting gun 14, and the mixed gas that is stored in mixed gas tank 13 can spray into by sleeve pipe coal spouting gun 14 air port of blast furnace 15.
Be understandable that, in present embodiment, also comprise judge module, judge module is connected with computing module, detection module and control module respectively, and whether judge module injecting coal quantity size of pulverized coal injection in blast furnace when judging that the injecting coal quantity size of pulverized coal injection in blast furnace after operation of blast furnace brings into operation with blast furnace changes.If change, the computing module being attached thereto calculates the amount of substance of the big or small corresponding required oxygen of unit time of injecting coal quantity of the pulverized coal injection in blast furnace after changing; Control module is used for controlling the first oxygen valve, the second oxygen valve and nitrogen valve to change the ratio that the amount of substance of oxygen accounts for the amount of substance of mixed gas.
Be understandable that, total oxygen valve 2, the first oxygen valve 4, the second oxygen valve 16 and nitrogen valve 10 in present embodiment are all controlled by control module.In the present embodiment, control module is used for controlling total oxygen valve 2, the first oxygen valve 4, the second oxygen valve 16 and nitrogen valve 10, and the uninterrupted while making 1 unit time of oxygen by total oxygen valve 2, the first oxygen valve 4, the second oxygen valve 16 and nitrogen valve 10 is controlled.
The operation scheme of the device of the adjustable nitrogen oxygen atmosphere of concentration is provided in order to be further interpreted as sleeve pipe coal spouting gun, its use-pattern is expressed as follows:
First according to the needs of producing, set the injecting coal quantity size of corresponding with it pulverized coal injection in blast furnace, then try spray, detection module detects the actual size of blast furnace nozzle ejection coal dust amount, in the present embodiment, detects the actual size of blast furnace nozzle ejection coal dust amount by injecting coal quantity detector.The blast furnace nozzle that the computer system being connected with injecting coal quantity detector receives detection sprays after the actual size of coal dust amount, by preset algorithm, calculate the amount of substance of corresponding with it required oxygen of unit time, that is to say and promote the blast furnace nozzle that actual measurement goes out to spray the amount of substance that coal dust amount needs to provide required oxygen of unit time in theory.
Then aborning, control total oxygen valve 2 and observe total oxygen flow meter 3, making the unit time consistent with the amount of substance of required oxygen 1 of the unit time calculating by the amount of substance of the oxygen 1 of total oxygen branch road.Oxygen 1 is divided into two portions when arriving the joint portion of the 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; Mix with the nitrogen 9 through nitrogen branch road after the second oxygen flow meter 17 and the second oxygen valve 16 on another road.The oxygen 1 that wherein enters the first oxygen branch road with enter the second oxygen branch road oxygen 1 ratio by the first oxygen valve 4 and the second oxygen valve 16 coordinate realize, and the oxygen 1 that enters the first oxygen branch road can be according to test or practical situation with the ratio of ratio that enters the oxygen 1 of the second oxygen branch road and set.In addition, the oxygen 1 that enters the second oxygen branch road mixes with the nitrogen 9 that enters nitrogen branch road, in mixed mixed gas, enter the oxygen 1 and the ratio that enters the nitrogen 9 of nitrogen branch road of the second oxygen branch road, can determine according to testing data and practical situation, and the content of oxygen improve mixed gas as much as possible under the prerequisite of use safety that guarantees sleeve pipe coal spouting gun 14 in.Mixed mixed gas is stored in mixed gas tank 13, so that sleeve pipe coal spouting gun 14 sprays into the mixed gas mixing the air port of blast furnace with certain pressure after mixed gas valve 12.
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 the big or small corresponding required oxygen of unit time of the injecting coal quantity with pulverized coal injection in blast furnace is divided into two portions, a part is mixed with cold wind through hot blast module and heats, improve the oxygen concentration in cold wind, and then improved 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, oxygen content in mixed gas can be controlled in air on oxygen level, also improve the oxygen concentration in hot blast, and then improved the efficiency of combustion of coal dust; Therefore the amount of substance that is divided into two-part required oxygen of unit time has all improved the oxygen concentration of hot-air mouth, has improved the efficiency of combustion of coal dust; And by nitrogen the content in mixed gas control, under the prerequisite of having avoided situation about setting off an explosion because oxygen concentration is excessive to occur, improved as much as possible the content of place, the air port oxygen of blast furnace, improved the efficiency of combustion of coal dust; In addition, the oxygen of unit time by hot blast module and mixed gas module is certain, when part of oxygen that mixed gas module is divided, the oxygen concentration of the hot-air system in hot blast module reduces while only having hot blast module, reduced that oxynitride produces and the harm that causes hot-air system intergranular stress corrosion; By control module, control current-limiting apparatus, reached the flexible change unit time through the oxygen of the first oxygen branch road, unit time through the oxygen of the second oxygen branch road and unit time the nitrogen through nitrogen branch road, greatly strengthened and provide stability that the device of the adjustable nitrogen oxygen atmosphere of concentration produces and applicable scope and handiness for sleeve pipe coal spouting gun.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. an oxygen enriching process for the adjustable nitrogen oxygen atmosphere of concentration is provided for sleeve pipe coal spouting gun, 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 required oxygen of Units of Account time;
Step b: the amount of substance of described required oxygen of unit time is entered respectively to the tuyere zone of described blast furnace simultaneously by the first oxygen branch road and the second oxygen branch road, oxygen by described the first oxygen branch road mixes and enters after the hot-air system of described blast furnace the tuyere zone of described blast furnace with cold wind, the oxygen by described the second oxygen branch road and nitrogen by nitrogen branch road are mixed to form mixed gas and through being arranged on sleeve pipe coal spouting gun on blast furnace, enter the tuyere zone of described blast furnace;
Step c: adjust in described mixed gas by the amount of substance of oxygen of described the second oxygen branch road and the ratio of the amount of substance of nitrogen by being arranged on the current-limiting apparatus of described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road.
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: after described step c, also comprise
Steps d: the injecting coal quantity size that detects described pulverized coal injection in blast furnace, if the injecting coal quantity of described pulverized coal injection in blast furnace size increases, recalculate the amount of substance of required oxygen of unit time, and according to described in recalculate the amount of substance of required oxygen of unit time, control described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road to recalculate the amount of substance of required oxygen of unit time to blast furnace input; If the injecting coal quantity size of described pulverized coal injection in blast furnace reduces, recalculate the amount of substance of required oxygen of unit time, and according to described in recalculate the amount of substance of required oxygen of unit time, control the ratio that amount of substance that described the first oxygen branch road, described the second oxygen branch road and described nitrogen branch road reduce oxygen accounts for the amount of substance of described mixed gas.
3. as claimed in claim 2ly provide the oxygen enriching process of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, it is characterized in that, after the described amount of substance that recalculates required oxygen of unit time, also comprise according to described in recalculate required oxygen of 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 unit time by the amount of substance of the oxygen of the first oxygen branch road, and make the amount of substance of unit time by the oxygen of the first oxygen branch road and the unit time amount of substance sum by the oxygen of the second oxygen branch road recalculate the amount of substance of required oxygen of unit time described in equaling.
As described in claims 1 to 3 any one 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 current-limiting apparatus comprises that being arranged on the first oxygen valve and first oxygen flow meter of described the first oxygen branch road, the second oxygen valve that is arranged on described the second oxygen branch road and the second oxygen flow takes into account nitrogen valve and the nitrogen flow meter that is arranged on described nitrogen branch road.
5. as claimed in claim 4ly 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.
6. a device for the adjustable nitrogen oxygen atmosphere of concentration is provided for sleeve pipe coal spouting gun, it is characterized in that, comprise
Detection module: be connected with the nozzle of pulverized coal injection in blast furnace, for detection of the injecting coal quantity size of pulverized coal injection in blast furnace;
Computing module: be connected the amount of substance of the injecting coal quantity size required oxygen of Units of Account time of the pulverized coal injection in blast furnace detecting according to described detection module with described detection module;
Hot blast module: comprise the first oxygen branch road and hot-air system, described the 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 the second oxygen branch road is communicated with described the first oxygen branch road, the other end of described the second oxygen branch road is communicated with described nitrogen branch road, the end that described the 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 current limliting unit, the second current limliting unit and the 3rd current limliting unit, described the first current limliting unit is arranged on described the first oxygen branch road, described the second current limliting unit is arranged on described the second oxygen branch road, and described the 3rd current limliting unit is arranged on described nitrogen branch road.
7. as claimed in claim 6ly provide the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, 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 variation of the injecting coal quantity size of pulverized coal injection in blast furnace, described computing module is for calculating the amount of substance of the big or small corresponding required oxygen of unit time of injecting coal quantity of the pulverized coal injection in blast furnace after variation, described control module is used for controlling described the first current limliting unit, described the second current limliting unit and described the 3rd current limliting unit are to change the ratio that the amount of substance of oxygen accounts for the amount of substance of described mixed gas.
8. as described in claim 6 or 7 any one, provide the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, it is characterized in that: described the first current limliting unit comprises the first oxygen valve and the first oxygen flow meter that is arranged on described the first oxygen branch road, described the second current limliting unit comprises the second oxygen valve and the second oxygen flow meter that is arranged on described the second oxygen branch road, and described the 3rd current limliting unit comprises nitrogen valve and the nitrogen flow meter that is arranged on described nitrogen branch road.
9. as claimed in claim 8ly provide the device of the adjustable nitrogen oxygen atmosphere of concentration for sleeve pipe coal spouting gun, it is characterized in that: described current-limiting apparatus also comprises total current limliting unit, described the first oxygen branch road is connected with described total current limliting unit with the end that described the second oxygen branch road is communicated with, and described total current limliting unit comprises total oxygen flow meter and total oxygen valve.
10. as claimed in claim 9 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 the 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 |