CN100566838C - Blast furnace blowing bituminous coal grinding machine system and smoke non-dewatering self-circulation technology thereof - Google Patents
Blast furnace blowing bituminous coal grinding machine system and smoke non-dewatering self-circulation technology thereof Download PDFInfo
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- CN100566838C CN100566838C CNB2006100724973A CN200610072497A CN100566838C CN 100566838 C CN100566838 C CN 100566838C CN B2006100724973 A CNB2006100724973 A CN B2006100724973A CN 200610072497 A CN200610072497 A CN 200610072497A CN 100566838 C CN100566838 C CN 100566838C
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Abstract
The invention relates to a kind of blast furnace blowing bituminous coal grinder system and smoke non-dewatering self-circulation technology method thereof, this technical method is a kind of pulverized coal injection into blast furna possible technique that is used for, this method comprises: charge into inert gas in closed feeder, rising grinding machine exit gas temperature, the inert gas that the heating Pulverized Coal Bin is used prevents spontaneous combustion of pulverized coal in the Pulverized Coal Bin; Charge into inert gas in cloth bag collection machine, the air that stops the Pulverized Coal Bin upper space that bleeds is from the cloth bag system of bleeding, and reduces system's oxygen content; To come out to return in the heating furnace of sending into the grinder system via pipeline again from cloth bag collection machine again and heat, recycle to reach by main smoke discharging blower fan.The present invention can make the blowing bituminous coal technological process reduce investment outlay, cut down the consumption of energy, utilize simultaneously the discarded object of oxyen manutactory (the dirty nitrogen of normal pressure).Compared with the prior art, reach the regulation of " the blast furnace blowing bituminous coal system anti-explosion safety rules " of blast furnace blowing bituminous coal equally, adapt to wide.
Description
Technical field
The present invention relates to the pulverized coal injection in blast furnace technical field, particularly relate to a kind of blast furnace blowing bituminous coal grinder system and smoke non-dewatering self-circulation technology method thereof.
Background technology
Existing when grinding with the blowing bituminous coal coal dust, must take measures to control spontaneous combustion of pulverized coal in design and the production process, bring out hazards such as fire and blast, for this reason, State Bureau of Technical Supervision issued on September 25th, 1996 " the anti-explosion safety rules＜GB16543-1996 of blast furnace blowing bituminous coal system 〉.Concerning grinder system, a 5.4.1 in important regulation＜safety code is arranged wherein 〉: should adopt inert gas as drying medium in manufacturing the system of coal dust, the design oxygen content of negative pressure system end should be not more than 12%.
In order to satisfy this regulation, all adopt to quote in the blowing bituminous coal design of new design of the overwhelming majority up to now or technological transformation to be: CO by the composition percent by volume
2(27.2%), N
2(71.03%), O
2(0.42%), H
2The blast-furnace hot-air kiln gas that O (1.35%) is formed and be: CO by the percent by volume of composition
2(25.188%), N
2(62.232%), O
2(8.246%), H
2The heating furnace flue gas that O (4.334%) is formed approximately is that the heating furnace flue gas of 90%～95% blast-furnace hot-air kiln gas and 5%～10% mixes the drying medium of back as grinding machine with ratio.
Also used self-loopa technology abroad, but usefulness is will be through the self-loopa technology of dehydration, using as French SOLLAC company will be through the self-loopa technology of dehydration, this part flue gas as self-loopa will be through entering grinding machine after (dropping to 40 ℃ from the 100 ℃) dehydration that cools again, the exhaust gas volumn very big (per hour several ten thousand to tens0000 standard cubic meters) that grinding machine is used, it is very high that used heat exchanger, cooling infrastructure (water pump, cooling tower) etc. consume investment, and flue gas is very big through cooling back use thermal loss, must increase the coal gas consumption of heating furnace.
See also shown in Figure 1, illustrated existing coal injection and pulverization flue gas recirculation system, this system comprises grinding machine 2, cloth bag collection machine 3, heating furnace 1 and hot-blast stove 6, wherein heating furnace 1 links to each other with outlet with the smoke inlet of grinding machine 2 via flue respectively with cloth bag collection machine 3, the flue gas that blast funnace hot blast stove 6 produces is sent into heating furnace 1 via smoke induced draught fan 5, mix with blast furnace gas, send into grinding machine 2 after the Hybrid Heating again, cloth bag collection machine 3 coal dust that autogenous tumbling mill 2 produces of collecting enters flue gas in the atmosphere by main smoke discharging blower fan 4 simultaneously.In existing coal injection and pulverization flue gas recirculation system, to constantly replenish the blast-furnace hot-air kiln gas as can be seen.
But in the prior art for quote the blast-furnace hot-air kiln gas need produce hot-blast stove fume etc. under the situation, it is very difficult to quote hot-blast stove fume, invest very high, have in addition can't quote.In addition, for the powder process workshop of no hot-blast stove fume, also can't quote.Equally, changing between the campaign, making the composition of blast-furnace hot-air kiln gas change easily for blast funnace hot blast stove, CO, O2 composition cyclic swing, very unfavorable to pulverized coal preparation system safety, and the production in pulverized coal preparation workshop is subjected to, and blast furnace staying is promptly out-of-blast, the influence of maintenance.
This shows that above-mentioned existing blast furnace blowing bituminous coal, obviously still has inconvenience and defective, and demands urgently further being improved with grinder system on the production method and use of system coal dust.In order to solve the problem that existing blast furnace blowing bituminous coal exists on the production method of system coal dust with grinder system, various equivalent modifications is there's no one who doesn't or isn't sought solution painstakingly, but do not see always that for a long time suitable design finished by development, and do not have appropriate method to address the above problem, obviously the problem that the anxious desire of relevant dealer solves to this.Therefore how to found a kind of new blast furnace blowing bituminous coal production method of grinder system and system coal dust, just become the current industry utmost point to need improved target.
Because the defective that above-mentioned existing blast furnace blowing bituminous coal exists in the production method of making coal dust with grinder system, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding a kind of new blast furnace blowing bituminous coal grinder system and smoke non-dewatering self-circulation technology thereof, can improve general existing blast furnace blowing bituminous coal grinder system, make it have more practicality.Through constantly research, design, and after studying repeatedly and improving, create the present invention who has practical value finally.
Summary of the invention
Main purpose of the present invention is, overcome the defective that existing blast furnace blowing bituminous coal exists with the grinder system technology, and the smoke non-dewatering self-circulation technology of a kind of new blast furnace blowing bituminous coal with grinder system be provided, technical problem to be solved is to make it that a kind of method of self-loopa is provided, do not needing to quote under the hot-blast stove fume situation, the most of flue gas of the flue gas of main exhaust fan outlet in the grinder system returned send into grinding machine and reach and constantly recycle voluntarily, reduce simultaneously the moisture that flue gas contains in process of production, minimizing system oxygen content has satisfied the requirement of safety code.
Another object of the present invention is to, overcome the defective that existing blast furnace blowing bituminous coal exists with grinder system, and provide a kind of new blast furnace blowing bituminous coal it to be reduced production costs by equipment of the present invention with grinder system, thus practical more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of blast furnace blowing bituminous coal that proposes according to the present invention is with the smoke non-dewatering self-loopa method of grinder system, and it may further comprise the steps: charge into inert gas toward closed feeder in, the prevention air enters grinding machine from run coal bin; Rising grinding machine exit gas temperature, the dew-point temperature that improves flue gas prevents that dewfall from occurring; The inert gas that the heating Pulverized Coal Bin is used prevents spontaneous combustion of pulverized coal in the Pulverized Coal Bin; Charge into inert gas in cloth bag collection machine, the air that stops the Pulverized Coal Bin upper space that bleeds is from the cloth bag grinder system that bleeds, and reduces the grinder system oxygen content; To enter the atmosphere from the wherein part of smoke that cloth bag collection machine comes out, part of smoke is returned in the heating furnace of sending in the grinder system via pipeline by main smoke discharging blower fan again and is heated in addition, recycles to reach again.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The aforesaid blast furnace blowing bituminous coal smoke non-dewatering self-loopa method of grinder system, wherein said inert gas is a nitrogen, this nitrogen is dirty nitrogen of normal pressure or low-pressure nitrogen.
The aforesaid blast furnace blowing bituminous coal smoke non-dewatering self-loopa method of grinder system, wherein said inert gas is pure useless flue gas, this flue gas is the mixed gas of carbon dioxide and nitrogen.
Aforesaid blast furnace blowing bituminous coal is to determine according to the system gas EQUILIBRIUM CALCULATION FOR PROCESS with the smoke non-dewatering self-loopa method of grinder system, the amount of inert gas that wherein charges into, and makes the design oxygen content of the terminal flue gas of system be not more than 12%.
The aforesaid blast furnace blowing bituminous coal smoke non-dewatering self-loopa method of grinder system, wherein the inert gas that described Pulverized Coal Bin is used is heated to 80 ℃.
Aforesaid blast furnace blowing bituminous coal is with the smoke non-dewatering self-loopa method of grinder system, wherein drives displacement along with coal dust enters high humidity amount flue gas in the Pulverized Coal Bin with the inert gas after the heating, keeps the interior gas of Pulverized Coal Bin to be in the not condition of high temperature of dewfall.
The aforesaid blast furnace blowing bituminous coal smoke non-dewatering self-loopa method of grinder system, the temperature that wherein grinding machine is exported the coal dust flue gas is increased to 95～100 ℃, prevents dewfall in order to the dew-point temperature that improves flue gas.
Aforesaid blast furnace blowing bituminous coal is with the smoke non-dewatering self-loopa method of grinder system, wherein makes the flue gas of grinding machine outlet and coal dust be higher than dew-point temperature via the minimum temperature of pipeline behind the cloth bag collection machine.
Aforesaid blast furnace blowing bituminous coal wherein enters atmosphere from wherein 30～40% the flue gas that cloth bag collection machine comes out with the smoke non-dewatering self-loopa method of grinder system, and other 60～70% hypoxic flue gases are used to recycle.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to the present invention propose a kind of for implementing the blast furnace blowing bituminous coal grinder system that abovementioned steps designs, this system comprises: grinding machine 2, cloth bag collection machine 3, heating furnace 1 and closed feeder 8; Wherein heating furnace 1 links to each other with outlet with the smoke inlet of grinding machine 2 via flue respectively with cloth bag collection machine 3; Wherein closed feeder 8 is sent into the mixed material of dirty nitrogen and raw coal in the grinding machine 2, cloth bag collection machine 3 coal dust and the flue gas that autogenous tumbling mill 2 produces of collecting, and flue gas returned the heating furnace of sending in the grinder system 1 by main smoke discharging blower fan 4 again via pipeline.
Via as can be known above-mentioned, the invention relates to the smoke non-dewatering self-circulation technology of a kind of blast furnace blowing bituminous coal with grinder system, disclose blast furnace blowing bituminous coal pulverized coal preparation workshop dry inert gas and utilized new technology, this technology is a kind of pulverized coal injection into blast furna possible technique that is used for, and can make the blowing bituminous coal technological process reduce investment outlay, cut down the consumption of energy, utilize simultaneously the discarded object of oxyen manutactory (the dirty nitrogen of normal pressure).Compared with the prior art, reach " the blast furnace blowing bituminous coal system anti-explosion safety rules " of blast furnace blowing bituminous coal＜need steel plant's coal powder injection design of workshop of blowing bituminous coal equally
By technique scheme, blast furnace blowing bituminous coal of the present invention has following advantage at least with the smoke non-dewatering self-circulation technology of grinder system:
1, the present invention adopts complete self-loopa technology, the self-loopa flue gas returns use fully from main exhaust fan is discharged flue gas, no longer be blended into any hot-blast stove fume or other flue gas (except by go into to grind flue-gas temperature need raise and the heating furnace flue gas that all must use).
2, the present invention does not need to quote hot-blast stove fume, and the wherein part of main induced-draft fan outlet flue gas enters in the atmosphere in grinder system, and most of flue gas in addition returns to be sent in the grinding machine, and wherein this part flue gas also is to contain very low inert gas of oxygen such as N
2, constantly recycling this flue gas voluntarily by such mode, production does not cause adverse effect (as dewfall, obstruction etc.) to the moisture that contains in the flue gas to grinding machine, and it is the same with the grinding machine of quoting hot-blast stove fume that the grinding machine operating rate reaches.In system work process, enter this system, make system's oxygen content be not more than 12% like this, satisfy the requirement of safety code owing to constantly there is nitrogen to replenish.And the production that blast-furnace coal powder prepares the workshop is not subjected to blast furnace staying and hot-blast stove burning to send the influence of changing stove.
In sum, the blast furnace blowing bituminous coal of novelty of the present invention grinder system and smoke non-dewatering self-circulation technology thereof, have above-mentioned plurality of advantages and practical value, no matter it is all having bigger improvement on using method or on the function, have technically than much progress, and produced handy and practical effect, and more existing blast furnace blowing bituminous coal has the multinomial effect of enhancement with grinder system, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the structure chart that illustrates existing coal injection and pulverization flue gas recirculation system.
Fig. 2 is the structure chart that illustrates coal injection and pulverization of blast furnace flue gas recirculation of the present invention system.
1: heating furnace 2: grinding machine
3: cloth bag collection machine 4: main smoke discharging blower fan
5: smoke induced draught fan 6: hot-blast stove
7: Pulverized Coal Bin 8: closed feeder
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, the blast furnace blowing bituminous coal that foundation the present invention is proposed is with grinding machine and effect thereof, describe in detail as after.
By the explanation of the specific embodiment, when can being to reach technological means that predetermined purpose takes and effect to get one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
See also shown in Figure 2, shown the structured flowchart of coal injection and pulverization flue gas recirculation of the present invention system, this system comprises grinding machine 2, cloth bag collection machine 3, heating furnace 1 and closed feeder 8, wherein heating furnace 1 links to each other with outlet with the smoke inlet of grinding machine 2 via flue respectively with cloth bag collection machine 3, Pulverized Coal Bin 7 is connected with cloth bag collection machine 3 in addition, closed feeder 8 is sent into the mixed material of dirty nitrogen and raw coal in the grinding machine 2, cloth bag collection machine 3 coal dust and the flue gas that autogenous tumbling mill 2 produces of collecting, and part of smoke entered in the atmosphere, the flue gas that most of oxygen content in addition is very low returns the heating furnace of sending in the grinder system 1 by main smoke discharging blower fan 4 again via pipeline.
In conjunction with above-mentioned coal injection and pulverization flue gas recirculation system, the present invention is for the oxygen content in the reduction system, at first in closed feeder 8, charge into the dirty nitrogen of normal pressure, it also can be useless flue gas as pure carbon dioxide and the mixed gas of nitrogen, for the design oxygen content of the terminal flue gas of assurance system is not more than 12%, calculates decision according to gas balance and charge into nitrogen or the carbon dioxide and the nitrogen mixed air scale of construction.Can stop air to enter grinding machine 2 like this from run coal bin (not shown go out).Closed feeder 8 is sent into the mixed material of dirty nitrogen or carbon dioxide and mixed gas of nitrogen and raw coal in the grinding machine 2, in addition, simultaneously the nitrogen of Pulverized Coal Bin 7 usefulness or carbon dioxide and the mixed gas of nitrogen are heated to 80 ℃, wherein this gas is to add in addition in the Pulverized Coal Bin 7, this gas prevents spontaneous combustion of pulverized coal in the Pulverized Coal Bin 7 on the one hand, drive displacement along with coal dust enters in the Pulverized Coal Bin 7 high humidity amount flue gas with nitrogen after the heating or the mixed gas of carbon dioxide and nitrogen on the other hand, and keep Pulverized Coal Bin 7 interior gases be in not can dewfall high temperature (＞70 ℃) state.Above-mentioned dirty nitrogen uses the mixed gas replacement of dirty nitrogen (waste gas that oxygen installation emits) of the normal pressure of extraction or low-pressure nitrogen or carbon dioxide and nitrogen to be blown into the sealing wind (being generally air in the prior art) of grinding machine 2 usually, to reduce system's oxygen content, wherein sealing wind mainly is the grinding roller bearing on sealing grinding machine 2 bodies, pull bar and mill three places (not shown go out), prevent that coal dust from entering bearing and excessive, played sealing function.Grinding machine 2 exit gas temperatures are brought up to 95～100 ℃ from 80～85 ℃ of general use, prevent that in order to the dew-point temperature that improves flue gas dewfall from occurring, the flue gas of this moment comprises: CO
2, N
2, O
2, H
2O, those flue gases and coal dust also are much higher than the dew-point temperature of those flue gases via the minimum temperature of pipeline behind the cloth bag collection machine 3, make the not possibility of dewfall in system of flue gas, the moisture that contains in the flue gas is produced grinding machine 2 caused adverse effect (as dewfall, obstruction etc.), wherein the material of this cloth bag collection machine 3 is antistatic terylene Nomexs, the temperature of permission＜120 ℃.And in cloth bag collection machine 3 dischargings (coal) pipe (not shown go out), charge into the dirty nitrogen of normal pressure or carbon dioxide mixes gas with nitrogen, this gas that charges into seals, bleed the air of Pulverized Coal Bin upper space from the cloth bag system of bleeding with prevention, and reduce system's oxygen content.The part of smoke of coming out from cloth bag collection machine 3 (about 30～40%) enters the atmosphere at last, the very low flue gas (60～70%) of most of oxygen content in addition by main smoke discharging blower fan 4 again via inert gas, most like this smoke discharging is used by constantly circulating voluntarily, and quotes that hot-blast stove fume is the same can to satisfy safety and production requirement.And need not the participation of hot-blast stove, and reduced production cost greatly, in the present embodiment except nitrogen or carbon dioxide and the mixed gas of nitrogen, other are fit to inert gases of the present invention and also can adopt from the above.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1, a kind of blast furnace blowing bituminous coal smoke non-dewatering self-loopa method of grinder system is characterized in that it may further comprise the steps:
In closed feeder, charge into inert gas, stop air to enter grinding machine from run coal bin;
Rising grinding machine exit gas temperature, the dew-point temperature that improves flue gas prevents that dewfall from occurring;
The inert gas that the heating Pulverized Coal Bin is used prevents spontaneous combustion of pulverized coal in the Pulverized Coal Bin;
Charge into inert gas in cloth bag collection machine, the air that stops the Pulverized Coal Bin upper space that bleeds is from the cloth bag grinder system that bleeds, and reduces the grinder system oxygen content;
To enter the atmosphere from the wherein part of smoke that cloth bag collection machine comes out, part of smoke is returned in the heating furnace of sending in the grinder system via pipeline by main smoke discharging blower fan again and is heated in addition, recycles to reach again.
2, blast furnace blowing bituminous coal according to claim 1 is characterized in that with the smoke non-dewatering self-loopa method of grinder system described inert gas is a nitrogen, and this nitrogen is dirty nitrogen of normal pressure or low-pressure nitrogen.
3, blast furnace blowing bituminous coal according to claim 1 is characterized in that with the smoke non-dewatering self-loopa method of grinder system described inert gas is pure useless flue gas, and this useless flue gas is the mixed gas of carbon dioxide and nitrogen.
4, use the smoke non-dewatering self-loopa method of grinder system according to claim 1,2 or 3 each described blast furnace blowing bituminous coals, it is characterized in that the amount of inert gas that charges into is to determine according to the system gas EQUILIBRIUM CALCULATION FOR PROCESS, and make the design oxygen content of the terminal flue gas of system be not more than 12%.
5, blast furnace blowing bituminous coal according to claim 1 is characterized in that the inert gas that described Pulverized Coal Bin is used is heated to 80 ℃ with the smoke non-dewatering self-loopa method of grinder system.
6, the blast furnace blowing bituminous coal according to claim 4 smoke non-dewatering self-loopa method of grinder system, it is characterized in that driveing displacement along with coal dust enters high humidity amount flue gas in the Pulverized Coal Bin, keep that gas is in the not condition of high temperature of dewfall in the Pulverized Coal Bin with the inert gas after the heating.
7, blast furnace blowing bituminous coal according to claim 1 is characterized in that with the smoke non-dewatering self-loopa method of grinder system the temperature that grinding machine is exported the coal dust flue gas is increased to 95～100 ℃, prevents dewfall in order to the dew-point temperature that improves flue gas.
8,, it is characterized in that making the flue gas of grinding machine outlet and coal dust to be higher than dew-point temperature via the minimum temperature of pipeline behind the cloth bag collection machine according to claim 1 or 7 described blast furnace blowing bituminous coals smoke non-dewatering self-loopa method with grinder systems.
9, the blast furnace blowing bituminous coal according to claim 1 smoke non-dewatering self-loopa method of grinder system, it is characterized in that wherein 30～40% the flue gas that cloth bag collection machine comes out is entered atmosphere, other 60～70% hypoxic flue gases are used to recycle.
10, a kind of blast furnace blowing bituminous coal grinder system for implementing to design as method as described in arbitrary in the claim 1 to 9 is characterized in that this system comprises: grinding machine (2), cloth bag collection machine (3), heating furnace (1) and closed feeder (8); Wherein heating furnace (1) links to each other with outlet with the smoke inlet of grinding machine (2) via flue respectively with cloth bag collection machine (3); Wherein closed feeder (8) is sent into the mixed material of dirty nitrogen and raw coal in the grinding machine (2), cloth bag collection machine (3) coal dust and the flue gas that autogenous tumbling mill (2) produces of collecting, and flue gas returned the heating furnace of sending in the grinder system (1) by main smoke discharging blower fan (4) again via pipeline.
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| EP2487439B1 (en) * | 2011-02-14 | 2019-05-08 | General Electric Technology GmbH | Method and system for milling a fuel for an oxy-fuel combustion burner |
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| CN109340809B (en) * | 2018-10-23 | 2019-12-31 | 东华工程科技股份有限公司 | Control system and method for high-volatile powdered coal preparation and drying process |
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