CN104561522A - Quick magnetite firing process - Google Patents
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- CN104561522A CN104561522A CN201510001960.4A CN201510001960A CN104561522A CN 104561522 A CN104561522 A CN 104561522A CN 201510001960 A CN201510001960 A CN 201510001960A CN 104561522 A CN104561522 A CN 104561522A
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Abstract
The invention discloses a quick magnetite firing process which mainly comprises three process links namely quick suspension preheating, roasting in a circular manner and quick suspension cooling. Quick preheating, roasting magnetization and cooling of powdery iron ore raw material can be finished within the shortest time, so that the iron ore is enabled to become ferromagnetic from non-magnetic or weak-magnetic, and the high ore dressing rate of the following magnetic separation is ensured; according to the quick magnetite firing process, the roasting time is short, the thermal efficiency is high, the operation is stable, the investment is small, the mineral handling capacity is high, the energy consumption can be effectively reduced, the production cost is decreased, and a large amount of water resources can be saved, so that the quick magnetite firing process can be widely applied to magnetizing roasting of lean ore resources such as siderite, hematite, limonite and specular hematite in China.
Description
Technical field
The present invention relates to a kind of magnetic roasting process of ferrous metal mine iron ore field, particularly a kind of technique of burning till magnetite fast.
Background technology
The low-grade usual method that is nonmagnetic or weak-magnetic iron ore of metallurgical industry process magnetizing roasting is carried out in this kind of difficult ore dressing make it be converted into magnetite, then carry out magnetic separation and make the minerals separation such as iron phase mineral and gangue.Early stage Zeng You enterprise of China adopts and first ore reduction is become block, then uses the technique of shaft furnace magnetizing roasting, but because this technique roasting efficiency is low, output is little and cost is high, does not obtain large-scale promotion and application.
In recent years, many enterprises are had to attempt adopting rotary kiln to carry out testing and producing.Although rotary kiln technology in technique with technically there is certain progress, owing to adopting lumpy material roasting, still exists the shortcoming that roasting time is long, energy consumption is high, efficiency is low and cost is high compared with shaft furnace, the prospect of its heavy industrialization application allows of no optimist.
For the problem of existing sinter process inefficiency, there has been proposed in recent years with suspension process calcinated powder material with Reaction time shorten, thus improve the technology imagination of roasting efficiency, and positive research experiment.Such as, patent CN1945186A proposes the technique of a kind of Pyatyi single series suspension preheating precalcining system roasting spathic iron ore, rhombohedral iron ore and limonite.But there are the following problems for this technique: adopt hotblast stove by the sensible heat heat supply of hot gas, efficiency of utilization certainly will be caused low, and the hot surge capability of system is little, resisting temperature fluctuation ability, unfavorable to stably manufactured; Reaktionsofen effectively can not control the residence time of material, and the anti-fluctuation ability of system, needs harsher operation; Adopt coventional type preheater, heat exchange efficiency is not high, also has very large room for promotion.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of technique of burning till magnetite fast, utilize the suspension preheating unit of high efficient heat exchanging, circulation roasting unit, the suspension cooling unit of high efficient heat exchanging, finished product bin and air feed unit are by powdered iron ore rapidly pre-warming, the heat treatment technics of roasting magnetization and cooling, there is roasting time short, thermo-efficiency is high, handled thing doses is large, the feature of stable operation, it promptly can be converted into ferromagnetic mineral (main component is magnetite) weak magnetic or nonmagnetic iron ore powder (micron order) at certain temperature and envrionment conditions, it is the new design with practicality and progressive, be suitable for industrial community wide popularization and application.
To achieve these goals, the technical solution used in the present invention is:
Burn till a technique for magnetite fast, comprise the steps:
Step 1, quick suspension preheating: complete the quick countercurrent flow between cold material and heat smoke in suspension preheating unit I, makes cold material temperature raise;
Step 2, circulation roasting is magnetized: the material after heating up is carried out roasting in circulation roasting unit II, and by unreacted in material after roasting completely coarse particles material be separated with the fine granular materials reacted completely, coarse particles loopback of material carries out circulation roasting, produces heat smoke and be sent to suspension preheating unit I for its heat exchange in process;
Step 3, quick suspension cooling: the quick countercurrent flow complete freezing air and roasting in suspension cooling unit III after between gained thermal material, thermal material temperature is reduced, and air temperature raises, and the air after intensification sends into circulation roasting unit II as combustion air;
Step 4, collection is put in storage: the material after temperature reduces is collected.
Wherein, in step 1, mainly utilize the suspension preheater with high solid and gas ratio of multistage multi-series, be carried into the forewarmer heat exchange tube of next stage suspended preheater by high-temperature hot flue gas after being unloaded by the preheater tremie pipe of upper level suspended preheater by low-temperature material, complete the heat exchange between cold material and warm air instantaneously, cold material temperature raises, the forewarmer heat exchange tube being discharged into more next stage suspended preheater continues to be preheated, heat smoke temperature reduces the forewarmer heat exchange tube entering upper level suspended preheater and continues to be lowered the temperature, finally be admitted to the roasting of circulation roasting unit by the preheater tremie pipe high-temperature material out of most next stage suspended preheater, by most upper level suspended preheater preheater air outlet out by the cold flue gas of lowering the temperature through flue gas house steward gather filter with dust-precipitator after emptying.
In step 2, mainly utilize the circulating roaster with tool separation function separator, by controlling the import wind speed of separator blast inlet, make unreacted completely coarse particles material be separated Posterior circle with the fine granular materials reacted completely and send into circulating roaster roasting, extend the residence time of the complete material of unreacted at roasting unit, improve reaction efficiency, wherein through the material of multistage suspension preheater preheats after most next stage suspended preheater is separated with heat smoke, circulating roaster is fed by the charging opening of stoving oven through this preheater tremie pipe, after furnacing, material is brought into separator by air-flow: here the undecomposed material of coarse particles is completely separated from the gas, through separator dipleg be recycled into stove material discharge opening and return to stoving oven.By the analytical results of fume component analysis instrument online on circulating roaster, accurately control the atmosphere in stoving oven at any time, make it meet to carry out to magnetize oxidation required for reaction or reduction or neutral atmosphere condition.
In step 3, mainly utilize and the react completely multistage multiple row suspension cooler of material waste heat of efficient recovery can carry out Quick air cooling, wherein high-temperature hot material enters the cooling that suspension cooling unit III carries out after circulation roasting unit collector is separated with flue gas is the high-temperature material unloaded by the collector dipleg of top circulation roasting unit is carried into the most higher level's suspension cooler of suspension cooling unit heat-exchange tube of cooler by low temperature cold air, complete the heat exchange between thermal material and freezing air instantaneously, thermal material temperature reduces, the heat-exchange tube of cooler being discharged into next stage suspension cooler continues cooling, air temperature raises the heat-exchange tube of cooler entering upper level suspension cooler to be continued to be preheated, finally used as combustion air by the water cooler air outlet high temperature air out of the most upper level suspension cooler roasting unit that enters to circulate, the cooled material unloaded by the water cooler tremie pipe of most next stage suspension cooler is sent into finished product bin and is stored.
Particularly, in described quick suspension preheating technological process:
Utilize multistage single-row suspended preheater by single-row series arrangement, material road adopts first parallel connection series system again, gas circuit adopts series system, wherein, cold material is added by the first step suspended preheater of topmost, the heat smoke carrying out self-circulation roasting unit II is entered by the most final stage suspended preheater of bottom, material from top to bottom successively by every grade of suspended preheater, and from down to up successively through the heat smoke countercurrent flow of every grade of suspended preheater;
Or,
Utilize multistage bi serie suspended preheater or multistage multi-series suspended preheater by biserial or multiple row arranged in parallel, material road adopts first parallel connection series system again, gas circuit adopts parallel way, wherein, the heat smoke carrying out self-circulation roasting unit II is divided into two row or multiple row, up side by side, respectively through the suspended preheater of each row, outer row after going out most upper level suspended preheater.
The form of the some row of some levels that described suspension preheating unit I is made up of several suspended preheaters, the airflow route of same column suspended preheater is series system, between row, airflow route is parallel way, the stream route of most upper level suspended preheater is parallel way, except most upper level, the stream route of suspended preheater at the same level is series system, and the discharging route of terminal column suspended preheater at the corresponding levels is connected with the charging route of first suspended preheater of subordinate.
Described suspended preheater is Whirlwind barrel structure, comprise a cyclone cylinder monomer 1, the top of cyclone cylinder monomer 1 is provided with preheater air outlet 5-1, side surface upper part is provided with preheater blast inlet 5-2, bottom is provided with preheater feed opening 5-3, preheater blast inlet 5-2 connects forewarmer heat exchange tube 7, and preheater feed opening 5-3 arranges airlock 8 and connects preheater tremie pipe 6
When suspension preheating unit I be single-stage single-row time, preheater air outlet 5-1 connects air feed unit V, and forewarmer heat exchange tube 7 connects the air outlet of circulation roasting unit II, and preheater tremie pipe 6 connects the opening for feed of circulation roasting unit II;
When suspension preheating unit I is single-stage multiple row, the preheater air outlet 5-1 of each row suspended preheater is all connected to air feed unit V, the forewarmer heat exchange tube 7 of each row suspended preheater all connects the air outlet of circulation roasting unit II and connects material inlet 4, and the preheater tremie pipe 6 of each row suspended preheater connects the opening for feed of circulation roasting unit II;
When suspension preheating unit I be multistage single-row time, the preheater air outlet 5-1 of the suspended preheater of next stage connects the forewarmer heat exchange tube 7 of the suspended preheater of upper level, the preheater air outlet 5-1 of the suspended preheater of most upper level connects air feed unit V, and the forewarmer heat exchange tube 7 of the suspended preheater of most upper level connects material inlet 4; The preheater tremie pipe 6 of the suspended preheater of upper level connects the forewarmer heat exchange tube 7 of the suspended preheater of next stage, the forewarmer heat exchange tube 7 of the suspended preheater of most next stage connects the air outlet of circulation roasting unit II, and the preheater tremie pipe 6 of most next stage suspended preheater connects the opening for feed of circulation roasting unit II;
Namely, multistage single-row time, topmost one-level preheater adopts parallel way, its lower employing series system at different levels, gas circuit adopts series system, and the heat smoke carrying out self-circulation roasting unit is entered by the most final stage preheater windspout barrel monomer blast inlet of bottom, cold material divides two-way to add by the first step preheater of topmost, converging again after first step preheater is a road, from top to bottom successively serial through every one-level preheater, and from down to up successively through the heat smoke countercurrent flow of every grade of preheater.
When suspension preheating unit I is multistage multiple row, the preheater air outlet 5-1 of the suspended preheater of the most upper level of each row all connects air feed unit V, the forewarmer heat exchange tube 7 of the suspended preheater of the most upper level of each row all connects material inlet 4, the preheater tremie pipe 6 of the suspended preheater of the most upper level of each row connects first forewarmer heat exchange tube 7 of next stage, the forewarmer heat exchange tube 7 of the suspended preheater of the most next stage of each row all connects the air outlet of circulation roasting unit II, the preheater air outlet 5-1 of the suspended preheater of same column next stage connects the forewarmer heat exchange tube 7 of the suspended preheater of same column upper level, except most upper level, the forewarmer heat exchange tube 7 of the suspended preheater of next column at the same level connects the preheater tremie pipe 6 of the suspended preheater of previous column at the same level, the preheater tremie pipe 6 of the suspended preheater of terminal column at the same level connects first the forewarmer heat exchange tube 7 of suspended preheater of subordinate, the preheater tremie pipe 6 of the suspended preheater of most next stage terminal column connects the opening for feed of circulation roasting unit II.
Namely, during multistage multiple row, material road adopts parallel way at the top one-level preheater, its lower employing series system at different levels, after cold material adds from system top charging opening, two or more preheaters that point two-way or multichannel add the first step are respectively carried by air-flow, converge again after first step preheater is a road, serial is through the preheater of every one-level different lines, gas circuit adopts parallel way, the heat smoke that self-circulation roasting unit collector air outlet is discharged, two row or multiple row is divided into through gas flow controller, up side by side, respectively through the A row preheater in every one-level and B row preheater, first mix after going out second stage preheater, be divided into two-way or multichannel again, enter two row or multiple row preheaters of the first step topmost respectively, after going out first step preheater, import again flue gas house steward mixes emptying.Adopt this streams first in parallelly to connect again, the mode of air-flow parallel connection can ensure that system has high gas, solid separation efficiency, improve the solid-gas ratio of preheating unit simultaneously, the heat of gas is fully utilized, thus reduces spent air temperture, improve the thermo-efficiency of whole system.
Described circulation roasting unit II comprises circulating roaster 11, separator 10 and collector 9, circulating roaster 11 top arranges stoving oven air outlet 11-1, bottom arranges stoving oven blast inlet 11-4, side arranges and is recycled into stove material discharge opening 11-3 and stoving oven opening for feed 11-2, separator 10 top arranges separator air outlet 10-3, bottom arranges separator dipleg 10-2, side arranges separator blast inlet 10-1, collector 9 top arranges collector air outlet 9-1, bottom arranges collector dipleg 9-3, side arranges collector blast inlet 9-2, wherein:
Stoving oven air outlet 11-1 is connected with separator blast inlet 10-1, stoving oven blast inlet 11-4 is connected with suspension cooling unit III air outlet, separator dipleg 10-2 be recycled into stove material discharge opening 11-3 and be connected, separator air outlet 10-3 is connected with collector blast inlet 9-2, collector dipleg 9-3 is connected with the blast inlet of suspension cooling unit III, collector air outlet 9-1 is connected with suspension preheating unit I blast inlet, and stoving oven opening for feed 11-2 is connected with suspension preheating unit I feed opening.
Described circulating roaster 11 side is provided with online fume component analysis instrument 11-5, by analytical results, accurately controls the atmosphere in stoving oven at any time, makes it meet to carry out to magnetize oxidation required for reaction or reduction or neutral atmosphere condition.
Described collector air outlet 9-1 is provided with gas flow controller 16.
In described quick suspension process of cooling:
Utilize multistage single-row suspension cooler by single-row series arrangement, material road and gas circuit all adopt series system, the high-temperature material unloaded from circulation roasting unit II from top to bottom successively serial through every first stage suspension cooler, and from down to up successively through the cooling air countercurrent flow of every grade of suspension cooler;
Or,
Utilize multistage bi serie suspension cooler or multistage multi-series suspension cooler by biserial or multiple row arranged in parallel, material road adopts series system, the high-temperature material unloaded from circulation roasting unit II from top to bottom serial through the suspension cooler of every one-level different lines, gas circuit adopts parallel way, freezing air divides two-way or multichannel up side by side, respectively through two row or multiple row suspension cooler of every one-level, mix again to gather after going out topmost first step suspension cooler and do the use of combustion-supporting hot blast into circulation roasting unit II.
The form of the some row of some levels that described suspension cooling unit III is made up of several suspension cooler, the airflow route of same column suspension cooler is series system, between row, airflow route is parallel way, the stream route of suspension cooler at the same level is series system, and the discharging route of terminal column suspension cooler at the corresponding levels is connected with the charging route of first suspension cooler of subordinate.
Described suspension cooler is Whirlwind barrel structure, comprise a cyclone cylinder monomer 2 12, the top of cyclone cylinder monomer 2 12 is provided with water cooler air outlet 12-1, side surface upper part is provided with water cooler blast inlet 12-2, bottom is provided with water cooler feed opening 12-3, water cooler blast inlet 12-2 connects heat-exchange tube of cooler 14, and water cooler feed opening 12-3 arranges airlock 8 and connects water cooler tremie pipe 13
When suspension cooling unit III be single-stage single-row time, water cooler air outlet 12-1 connects the blast inlet of circulation roasting unit II, and water cooler blast inlet 12-2 connects the feed opening of circulation roasting unit II and outside cold wind, and water cooler feed opening 12-3 connects finished product bin IV;
When suspension cooling unit III is single-stage multiple row, the water cooler air outlet 12-1 of each row suspension cooler all connects the blast inlet of circulation roasting unit II, the water cooler blast inlet 12-2 of each row suspension cooler connects outside cold wind, the water cooler tremie pipe 13 of previous column suspension cooler connects the heat-exchange tube of cooler 14 of a rear row suspension cooler, the heat-exchange tube of cooler 14 of first suspension cooler connects the feed opening of circulation roasting unit II, and the water cooler tremie pipe 13 of terminal column suspension cooler connects finished product bin IV;
When suspension cooling unit III be multistage single-row time, the water cooler air outlet 12-1 of the suspension cooler of next stage connects the heat-exchange tube of cooler 14 of the suspension cooler of upper level, the water cooler air outlet 12-1 of the suspension cooler of most upper level connects the blast inlet of circulation roasting unit II, the heat-exchange tube of cooler 14 of the suspension cooler of most upper level connects the feed opening of circulation roasting unit II, the water cooler tremie pipe 13 of the suspension cooler of upper level connects the heat-exchange tube of cooler 14 of the suspension cooler of next stage, the water cooler tremie pipe 13 of most next stage suspension cooler connects finished product bin IV, the water cooler blast inlet 12-2 of most next stage suspension cooler connects outside cold wind,
Namely, multistage single-row time, material road and gas circuit all adopt series system, the high-temperature material unloaded from top circulation roasting unit II collector dipleg 9-3 from top to bottom serial through every one-level water cooler, and from down to up successively through the cooling air countercurrent flow of every grade of water cooler.
When suspension cooling unit III is multistage multiple row, the water cooler air outlet 12-1 of the suspension cooler of same column next stage connects the heat-exchange tube of cooler 14 of the suspension cooler of same column upper level, the water cooler air outlet 12-1 of the suspension cooler of the most upper level of each row all connects the blast inlet of circulation roasting unit II, the heat-exchange tube of cooler 14 of the suspension cooler of the most next stage of each row all connects outside cold wind, the heat-exchange tube of cooler 14 of the suspension cooler of next column at the same level connects the water cooler tremie pipe 13 of the suspension cooler of previous column at the same level, the water cooler tremie pipe 13 of the suspension cooler of terminal column at the same level connects first the heat-exchange tube of cooler 14 of suspension cooler of subordinate, first the heat-exchange tube of cooler 14 of suspension cooler of most upper level connects the feed opening of circulation roasting unit II, the water cooler tremie pipe 13 of the suspension cooler of most next stage terminal column connects finished product bin IV.
Namely, during multistage multiple row, material road adopts series system, the high-temperature material unloaded from top circulation roasting unit II collector dipleg 9-3 from top to bottom serial through the water cooler of every one-level different lines, gas circuit adopts parallel way, cooling freezing air divides two-way or multichannel up side by side, respectively through two row or multiple row water coolers of every one-level, mixes again to gather and do the use of combustion-supporting hot blast into circulating roaster 11 after going out topmost first step water cooler.
Air feed unit V is utilized to provide system works power and fluid medium:
Described air feed unit V is made up of dust-precipitator 2 and centrifugal blower 1, wherein dust-precipitator 2 connects the air outlet of suspension preheating unit I by flue gas house steward 3, the pneumatic outlet of dust-precipitator 2 connects the blast inlet of centrifugal blower 1, and the air outlet of centrifugal blower 1 connects the blast inlet of suspension cooling unit III;
Or,
Described air feed unit V is made up of the gas blower 15 connecting suspension cooling unit III blast inlet;
Or,
Described air feed unit V forms by connecting the gas blower 15 of suspension cooling unit III blast inlet and the dust-precipitator 2 be serially connected on the air outlet flue gas house steward 3 of suspension preheating unit I and centrifugal blower 1, by gas blower 15 and centrifugal blower 1 with mode air feed simultaneously or in turn.
Although it is emphasized that suspended preheater of the present invention and suspension cooler are cyclone cylinder structure, the two heat exchanged mechanism is different.
Suspended preheater adds forewarmer heat exchange tube 7 by preheater charging opening 18 after low-temperature material is unloaded by the preheater tremie pipe 6 of higher level's preheater, the heat exchange completed instantaneously between cold material and warm air is carried at by high-temperature hot flue gas, cold material temperature raises, the forewarmer heat exchange tube 7 being discharged into next stage suspended preheater continues to be preheated, heat smoke temperature enters upper level suspended preheater forewarmer heat exchange tube 7 after reducing continues to be lowered the temperature, finally be admitted to circulation roasting unit II roasting by preheater tremie pipe 6 high-temperature material out of most next stage preheater, by most upper level suspended preheater preheater air outlet 5-1 out by the cold flue gas of lowering the temperature through flue gas house steward 3 gather filter with dust-precipitator 2 after emptying.
To be then high-temperature hot material by higher level circulate suspension cooler to be carried into the heat-exchange tube of cooler 14 of most upper level suspension cooler after the collector dipleg 9-3 of roasting unit II unloads by low temperature cold air, complete the heat exchange between thermal material and freezing air instantaneously, thermal material temperature reduces, the heat-exchange tube of cooler 14 being discharged into next stage suspension cooler continues cooling, air temperature raises the heat-exchange tube of cooler 14 entering upper level suspension cooler to be continued to be preheated, finally used as combustion air by the water cooler air outlet 12-1 high temperature air out of the most upper level suspension cooler roasting unit II that enters to circulate, the cooled material unloaded by the water cooler tremie pipe 13 of most next stage suspension cooler is sent into finished product bin IV and is stored.
Compared with prior art, the invention has the beneficial effects as follows, can be rapidly strongly magnetic mineral by weak magnetic or the roasting of nonmagnetic iron ore powder at certain temperature and envrionment conditions, roasting time is short, heat utilization efficiency is high, stable operation, mineral processing amount is large, can effectively reduce energy consumption and production cost, simultaneously because adopting quick air cooling, saving great lot of water resources, meeting cost benefit, there is suitable industrial utilization, be widely used in the magnetizing roasting of the lean ore resources such as China's spathic iron ore, rhombohedral iron ore, limonite, specularite.
Accompanying drawing explanation
Fig. 1 is the first preferred embodiment process schematic representation of the present invention.
Fig. 2 is the second preferred embodiment process schematic representation of the present invention.
Embodiment
For further setting forth the present invention for the technique means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the embodiment of burning till magnetite technique fast proposed according to the present invention, method, step, feature and effect thereof, be described in detail as follows.
Aforementioned and other technology contents, Characteristic for the present invention, can clearly present in the detailed description of following cooperation with reference to graphic preferred embodiment.
By the explanation of embodiment, when can to the present invention for the technique means reaching predetermined object and take and effect obtain one more deeply and concrete understanding, however institute's accompanying drawings be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
First most preferred embodiment
As shown in Figure 1, better first embodiment of the present invention burn till magnetite technique fast, mainly comprise the steps:
Step 1, quick suspension preheating: complete the quick countercurrent flow between cold material and heat smoke in suspension preheating unit I, makes cold material temperature raise;
Step 2, circulation roasting is magnetized: the material after heating up is carried out roasting in circulation roasting unit II, and by unreacted in material after roasting completely coarse particles material be separated with the fine granular materials reacted completely, coarse particles loopback of material carries out circulation roasting, produces heat smoke and be sent to suspension preheating unit I for its heat exchange in process;
Step 3, quick suspension cooling: the quick countercurrent flow complete freezing air and roasting in suspension cooling unit III after between gained thermal material, thermal material temperature is reduced, and air temperature raises, and the air after intensification sends into circulation roasting unit II as combustion air;
Step 4, collection is put in storage: the material after temperature reduces is collected.
The main device used in technological process comprises suspension cooling unit III, finished product bin IV and air feed unit V five parts of suspension preheating unit I, circulation roasting unit II and high efficient heat exchanging, wherein:
Suspension preheating unit I mainly comprises suspended preheater, suspended preheater is Whirlwind barrel structure, comprise a cyclone cylinder monomer 1, preheater air outlet 5-1 is had at cyclone cylinder monomer 1 top, there is preheater blast inlet 5-2 side, and preheater feed opening 5-3 is arranged at bottom, and preheater blast inlet 5-2 connects forewarmer heat exchange tube 7, preheater feed opening 5-3 connects preheater tremie pipe 6, and preheater tremie pipe 6 is provided with airlock 8.
Circulation roasting unit II comprises collector 9, separator 10 and circulating roaster 11, and wherein the top of collector 9 is provided with collector air outlet 9-1, and side is provided with collector blast inlet 9-2, and bottom is provided with collector dipleg 9-3.Separator 10 top is provided with separator air outlet 10-3, and side is provided with separator blast inlet 10-1, and bottom is provided with separator dipleg 10-1.The top of circulating roaster 11 is provided with stoving oven air outlet 11-1, and bottom is provided with stoving oven blast inlet 11-4, and upper side is provided with online fume component analysis instrument 11-5, and both sides, bottom are respectively provided with and are recycled into stove material discharge opening 11-3 and stoving oven charging opening 11-2.
Suspension cooling unit III comprises suspension cooler, suspension cooler is Whirlwind barrel structure, comprise a cyclone cylinder monomer 2 12, water cooler air outlet 12-2 is had at cyclone cylinder monomer 2 12 top, there is water cooler blast inlet 12-1 side, water cooler feed opening 12-3 is arranged at bottom, and water cooler feed opening 12-3 connects water cooler tremie pipe 13, water cooler blast inlet 12-1 and connects heat-exchange tube of cooler 14.
Air feed unit V, system works power and fluid medium are provided, be made up of dust-precipitator 2 and centrifugal blower 1, wherein dust-precipitator 2 connects the air outlet of suspension preheating unit I by flue gas house steward 3, the pneumatic outlet of dust-precipitator 2 connects the blast inlet of centrifugal blower 1, and the air outlet of centrifugal blower 1 connects the blast inlet of suspension cooling unit III.
Its main processes comprises the following steps:
One is air feed: the device of this step is air feed unit V, in order to provide power and the fluid medium-freezing air of system works.
Two is quick suspension preheatings: the device of this step is suspension preheating unit I, and be made up of the multistage suspension preheater of single-row serial or biserial, multiple row arranged in parallel, uppermost preheater is called the first step, is called the second stage successively downwards ..., most final stage.When suspended preheater is biserial arranged in parallel, A row suspended preheater and B row suspended preheater arranged in parallel as shown in Figure 1, wherein A row suspended preheater C1A and B row suspended preheater C1B arranged in parallel are one-level, A row suspended preheater C2A and B row suspended preheater C2B arranged in parallel are one-level, A row suspended preheater C3A and B row suspended preheater C3B arranged in parallel are one-level, A row suspended preheater C4A and B row suspended preheater C4B arranged in parallel are one-level, totally 4 grades, material road 103 adopts parallel way at the top first step preheater, its lower employing series system at different levels, gas circuit 104 adopts parallel way: cold material and raw material 102 add two preheater C1A and C1B of the first step respectively from system upper part two-way, converge again after first step preheater is a road, the A of serial in every one-level that intersect successively arranges and B row suspended preheater: C2A C2B C3A C3B C4A C4B, as shown in solid arrow material road 103 in Fig. 1.Heat smoke from roasting unit II is divided into two row through gas flow controller 16, up side by side, respectively through the A row suspended preheater in every one-level and B row suspended preheater, the material run from top to bottom and the heat smoke countercurrent flow passing every grade of preheater from down to up successively, as shown in dotted arrow gas circuit 104 in Fig. 1.Adopt that this streams is connected, the mode of air-flow parallel connection can improve the solid-gas ratio of preheating unit, the heat of gas is fully utilized, thus reduces spent air temperture, improve the thermo-efficiency of whole system.
Three is circulation roasting magnetization: the device of this step is ciculation fluidized roasting unit II, in the side coal powder injection 105 of the below back taper cylinder of circulating roaster 11.Material through suspension preheating unit I preheating feeds decomposing furnace by stoving oven charging opening 11-2, separator 10 is entered by stoving oven air outlet 11-1 after roasting, this separator 10 tool separation function, under suitable separator import wind speed, unreacted completely coarse particles material be separated with the fine granular materials reacted completely after through separator dipleg 10-2 be recycled into stove material discharge opening 11-3 and be again recycled and send into circulating roaster 11 roasting, thus extend the complete material of unreacted in the residence time of roasting unit, improve reaction efficiency.
Four is collect: the fine granular materials reacted completely is carried the separator air outlet 10-3 leaving separator 10 top by heat smoke, enter collector 9, leaves circulation roasting unit II after separated from the gas through collector dipleg 9-3.Heat smoke is discharged by the collector air outlet 9-1 on collector top, enters suspension preheating unit I and uses as pre-thermal medium.
Five is the coolings that suspend: the device of this step is suspension cooling unit III, and be made up of the suspension cooler of multistage single-row serial or multistage biserial, multiple row arranged in parallel, uppermost preheater is called the first step, is called the second stage successively downwards ..., most final stage.When suspension cooler is single-row serial arrangement, as shown in Figure 1, suspension cooler CL1 and suspension cooler CL2 serial arrangement two-stage altogether, material road 103 and gas circuit 104 all adopt series system, the high-temperature material unloaded from top circulation roasting unit II from top to bottom serial through the suspension cooler of every one-level, cold wind 106 enters from most final stage suspension cooler CL2, serial from bottom to top, respectively through the suspension cooler of every one-level, at material, in the process of gas countercurrent flow thermal material cooled after be collected in most final stage suspension cooler, freezing air is preheated, the roasting unit II that enters to circulate after going out first step suspension cooler CL1 does combustion-supporting hot blast and uses.
Six is put in storage: the finished product materials of collecting at the most final stage suspension cooler CL1 of suspension cooling unit III enters finished product bin IV and stores, and the control of dust of dust-precipitator 2 finally send raw material cabin 101.
Second most preferred embodiment
As shown in Figure 2, suspension preheating unit I is single-row serial arrangement, material road adopts parallel way and A row suspended preheater C1A and B row suspended preheater C1B parallel connection to be one-level at the top first step preheater, its lower employing series system at different levels and suspended preheater C2, suspended preheater C3, suspended preheater C4 connects, be one-level separately, gas circuit 104 adopts series system: cold material adds A row suspended preheater C1A and the B row suspended preheater C1B of the first step respectively from system upper part two-way, converging again after the preheating of first step suspended preheater is a road, serial is through the suspended preheater of every one-level and suspended preheater C2, suspended preheater C3, suspended preheater C4, heat smoke single channel from roasting unit II is up, respectively through the suspended preheater C4 in every one-level, suspended preheater C3, suspended preheater C2 and first step A row suspended preheater C1A and first step B row suspended preheater C1B, the material run from top to bottom and the heat smoke countercurrent flow passing every grade of suspended preheater from down to up successively, as shown in solid arrow material road 103 and dotted arrow gas circuit 104 in Fig. 2.System works power and fluid medium are provided by the gas blower 15 be connected on the heat-exchange tube of cooler 14 of the most next stage suspension suspension cooler CL2 of suspension cooling unit III, and cold wind 106 enters from gas blower 15.Other steps are with embodiment 1.
3rd most preferred embodiment
According to industrial scale size, progression or the columns of the suspended preheater of suspension preheating unit I and the suspension cooler of suspension cooling unit III can be increased and decreased in the scope of 2-5 level.Such as, if material treatment capacity is less, can other be constant by removing by the 2nd of the suspension preheating unit of level Four bi serie arranged in parallel the grade in embodiment 1, suspension preheating unit is become three grades of bi serie arranged in parallel, or keep 4 grades, columns is kept to 1 grade, suspension preheating unit is become the single-row serial layout viewing 2 of level Four.For another example: if need ultra-large material handling, can be three series or four series by preheater and water cooler serial expanded, gas trend be still parallel way, and material trend is series system, and other techniques are constant.
Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. burn till a technique for magnetite fast, it is characterized in that, comprise the steps:
Step 1, quick suspension preheating: complete the quick countercurrent flow between cold material and heat smoke in suspension preheating unit (I), makes cold material temperature raise;
Step 2, circulation roasting is magnetized: the material after heating up is carried out roasting in circulation roasting unit (II), and by unreacted in material after roasting completely coarse particles material be separated with the fine granular materials reacted completely, coarse particles loopback of material carries out circulation roasting, produces heat smoke and be sent to suspension preheating unit (I) for its heat exchange in process;
Step 3, quick suspension cooling: the quick countercurrent flow complete freezing air and roasting in suspension cooling unit (III) after between gained thermal material, thermal material temperature is reduced, air temperature raises, and the air after intensification sends into circulation roasting unit (II) as combustion air;
Step 4, collection is put in storage: the material after temperature reduces is collected.
2. technique of burning till magnetite fast according to claim 1, is characterized in that, in described quick suspension preheating technological process:
Utilize multistage single-row suspended preheater by single-row series arrangement, material road adopts first parallel connection series system again, gas circuit adopts series system, wherein, cold material is added by the first step suspended preheater of topmost, the heat smoke carrying out self-circulation roasting unit (II) is entered by the most final stage suspended preheater of bottom, material from top to bottom successively by every grade of suspended preheater, and from down to up successively through the heat smoke countercurrent flow of every grade of suspended preheater;
Or,
Utilize multistage bi serie suspended preheater or multistage multi-series suspended preheater by biserial or multiple row arranged in parallel, material road adopts first parallel connection series system again, gas circuit adopts parallel way, wherein, the heat smoke carrying out self-circulation roasting unit (II) is divided into two row or multiple row, up side by side, respectively through the suspended preheater of each row, outer row after going out most upper level suspended preheater.
3. technique of burning till magnetite fast according to claim 1, it is characterized in that, the form of the some row of some levels that described suspension preheating unit (I) is made up of several suspended preheaters, the airflow route of same column suspended preheater is series system, between row, airflow route is parallel way, the stream route of most upper level suspended preheater is parallel way, except most upper level, the stream route of suspended preheater at the same level is series system, and the discharging route of terminal column suspended preheater at the corresponding levels is connected with the charging route of first suspended preheater of subordinate.
4. technique of burning till magnetite fast according to claim 3, it is characterized in that, described suspended preheater is Whirlwind barrel structure, comprise a cyclone cylinder monomer one (5), the top of cyclone cylinder monomer one (5) is provided with preheater air outlet (5-1), side surface upper part is provided with preheater blast inlet (5-2), bottom is provided with preheater feed opening (5-3), preheater blast inlet (5-2) connects forewarmer heat exchange tube (7), preheater feed opening (5-3) arranges airlock (8) and connects preheater tremie pipe (6)
When suspension preheating unit (I) for single-stage single-row time, preheater air outlet (5-1) connects air feed unit (V), forewarmer heat exchange tube (7) connects the air outlet of circulation roasting unit (II), and preheater tremie pipe (6) connects the opening for feed of circulation roasting unit (II);
When suspension preheating unit (I) is for single-stage multiple row, the preheater air outlet (5-1) of each row suspended preheater is all connected to air feed unit (V), the forewarmer heat exchange tube (7) of each row suspended preheater all connects the air outlet of circulation roasting unit (II) and connects material inlet (4), and the preheater tremie pipe (6) of each row suspended preheater connects the opening for feed of circulation roasting unit (II);
When suspension preheating unit (I) for multistage single-row time, the preheater air outlet (5-1) of the suspended preheater of next stage connects the forewarmer heat exchange tube (7) of the suspended preheater of upper level, the preheater air outlet (5-1) of the suspended preheater of most upper level connects air feed unit (V), and the forewarmer heat exchange tube (7) of the suspended preheater of most upper level connects material inlet (4); The preheater tremie pipe (6) of the suspended preheater of upper level connects the forewarmer heat exchange tube (7) of the suspended preheater of next stage, the forewarmer heat exchange tube (7) of the suspended preheater of most next stage connects the air outlet of circulation roasting unit (II), and the preheater tremie pipe (6) of most next stage suspended preheater connects the opening for feed of circulation roasting unit (II);
When suspension preheating unit (I) is for multistage multiple row, the preheater air outlet (5-1) of the suspended preheater of the most upper level of each row all connects air feed unit (V), the forewarmer heat exchange tube (7) of the suspended preheater of the most upper level of each row all connects material inlet (4), the preheater tremie pipe (6) of the suspended preheater of the most upper level of each row connects first forewarmer heat exchange tube (7) of next stage, the forewarmer heat exchange tube (7) of the suspended preheater of the most next stage of each row all connects the air outlet of circulation roasting unit (II), the preheater air outlet (5-1) of the suspended preheater of same column next stage connects the forewarmer heat exchange tube (7) of the suspended preheater of same column upper level, except most upper level, the forewarmer heat exchange tube (7) of the suspended preheater of next column at the same level connects the preheater tremie pipe (6) of the suspended preheater of previous column at the same level, the preheater tremie pipe (6) of the suspended preheater of terminal column at the same level connects first the forewarmer heat exchange tube (7) of suspended preheater of subordinate, the preheater tremie pipe (6) of the suspended preheater of most next stage terminal column connects the opening for feed of circulation roasting unit (II).
5. technique of burning till magnetite fast according to claim 1, it is characterized in that, described circulation roasting unit (II) comprises circulating roaster (11), separator (10) and collector (9), circulating roaster (11) top arranges stoving oven air outlet (11-1), bottom arranges stoving oven blast inlet (11-4), side arranges and is recycled into stove material discharge opening (11-3) and stoving oven opening for feed (11-2), separator (10) top arranges separator air outlet (10-3), bottom arranges separator dipleg (10-2), side arranges separator blast inlet (10-1), collector (9) top arranges collector air outlet (9-1), bottom arranges collector dipleg (9-3), side arranges collector blast inlet (9-2), wherein:
Stoving oven air outlet (11-1) is connected with separator blast inlet (10-1), stoving oven blast inlet (11-4) is connected with suspension cooling unit (III) air outlet, separator dipleg (10-2) be recycled into stove material discharge opening (11-3) and be connected, separator air outlet (10-3) is connected with collector blast inlet (9-2), collector dipleg (9-3) is connected with the blast inlet of suspension cooling unit (III), collector air outlet (9-1) is connected with suspension preheating unit (I) blast inlet, stoving oven opening for feed (11-2) is connected with suspension preheating unit (I) feed opening.
6. technique of burning till magnetite fast according to claim 5, it is characterized in that, described circulating roaster (11) side is provided with online fume component analysis instrument (11-5), and described collector air outlet (9-1) is provided with gas flow controller (16).
7. the technique of burning till magnetite fast according to the arbitrary claim of claim 1 to 6, is characterized in that, in described quick suspension process of cooling:
Utilize multistage single-row suspension cooler by single-row series arrangement, material road and gas circuit all adopt series system, the high-temperature material unloaded from circulation roasting unit (II) from top to bottom successively serial through every first stage suspension cooler, and from down to up successively through the cooling air countercurrent flow of every grade of suspension cooler;
Or,
Utilize multistage bi serie suspension cooler or multistage multi-series suspension cooler by biserial or multiple row arranged in parallel, material road adopts series system, the high-temperature material unloaded from circulation roasting unit (II) from top to bottom serial through the suspension cooler of every one-level different lines, gas circuit adopts parallel way, freezing air divides two-way or multichannel up side by side, respectively through two row or multiple row suspension cooler of every one-level, mix again to gather after going out topmost first step suspension cooler and do the use of combustion-supporting hot blast into circulation roasting unit (II).
8. technique of burning till magnetite fast according to claim 1, it is characterized in that, the form of the some row of some levels that described suspension cooling unit (III) is made up of several suspension cooler, the airflow route of same column suspension cooler is series system, between row, airflow route is parallel way, the stream route of suspension cooler at the same level is series system, and the discharging route of terminal column suspension cooler at the corresponding levels is connected with the charging route of first suspension cooler of subordinate.
9. technique of burning till magnetite fast according to claim 8, it is characterized in that, described suspension cooler is Whirlwind barrel structure, comprise a cyclone cylinder monomer two (12), the top of cyclone cylinder monomer two (12) is provided with water cooler air outlet (12-1), side surface upper part is provided with water cooler blast inlet (12-2), bottom is provided with water cooler feed opening (12-3), water cooler blast inlet (12-2) connects heat-exchange tube of cooler (14), water cooler feed opening (12-3) arranges airlock (8) and connects water cooler tremie pipe (13),
When suspension cooling unit (III) for single-stage single-row time, water cooler air outlet (12-1) connects the blast inlet of circulation roasting unit (II), water cooler blast inlet (12-2) connects the feed opening of circulation roasting unit (II) and outside cold wind, and water cooler feed opening (12-3) connects finished product bin (IV);
When suspension cooling unit (III) is for single-stage multiple row, the water cooler air outlet (12-1) of each row suspension cooler all connects the blast inlet of circulation roasting unit (II), the water cooler blast inlet (12-2) of each row suspension cooler connects outside cold wind, the water cooler tremie pipe (13) of previous column suspension cooler connects the heat-exchange tube of cooler (14) of a rear row suspension cooler, the heat-exchange tube of cooler (14) of first suspension cooler connects the feed opening of circulation roasting unit (II), the water cooler tremie pipe (13) of terminal column suspension cooler connects finished product bin (IV),
When suspension cooling unit (III) for multistage single-row time, the water cooler air outlet (12-1) of the suspension cooler of next stage connects the heat-exchange tube of cooler (14) of the suspension cooler of upper level, the water cooler air outlet (12-1) of the suspension cooler of most upper level connects the blast inlet of circulation roasting unit (II), the heat-exchange tube of cooler (14) of the suspension cooler of most upper level connects the feed opening of circulation roasting unit (II), the water cooler tremie pipe (13) of the suspension cooler of upper level connects the heat-exchange tube of cooler (14) of the suspension cooler of next stage, the water cooler tremie pipe (13) of most next stage suspension cooler connects finished product bin (IV), the water cooler blast inlet (12-2) of most next stage suspension cooler connects outside cold wind,
When suspension cooling unit (III) is for multistage multiple row, the water cooler air outlet (12-1) of the suspension cooler of same column next stage connects the heat-exchange tube of cooler (14) of the suspension cooler of same column upper level, the water cooler air outlet (12-1) of the suspension cooler of the most upper level of each row all connects the blast inlet of circulation roasting unit (II), the heat-exchange tube of cooler (14) of the suspension cooler of the most next stage of each row all connects outside cold wind, the heat-exchange tube of cooler (14) of the suspension cooler of next column at the same level connects the water cooler tremie pipe (13) of the suspension cooler of previous column at the same level, the water cooler tremie pipe (13) of the suspension cooler of terminal column at the same level connects first the heat-exchange tube of cooler (14) of suspension cooler of subordinate, first the heat-exchange tube of cooler (14) of suspension cooler of most upper level connects the feed opening of circulation roasting unit (II), the water cooler tremie pipe (13) of the suspension cooler of most next stage terminal column connects finished product bin (IV).
10. technique of burning till magnetite fast according to claim 1, is characterized in that, utilizes air feed unit (V) to provide system works power and fluid medium:
Described air feed unit (V) is made up of dust-precipitator (2) and centrifugal blower (1), wherein dust-precipitator (2) connects the air outlet of suspension preheating unit (I) by flue gas house steward (3), the pneumatic outlet of dust-precipitator (2) connects the blast inlet of centrifugal blower (1), and the air outlet of centrifugal blower (1) connects the blast inlet of suspension cooling unit (III);
Or,
Described air feed unit (V) is made up of the gas blower (15) connecting suspension cooling unit (III) blast inlet;
Or,
Described air feed unit (V) forms by connecting the gas blower (15) of suspension cooling unit (III) blast inlet and the dust-precipitator (2) be serially connected on the air outlet flue gas house steward (3) of suspension preheating unit (I) and centrifugal blower (1), by gas blower (15) and centrifugal blower (1) with while or mode air feed in turn.
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| CN201510001960.4A CN104561522A (en) | 2015-01-05 | 2015-01-05 | Quick magnetite firing process |
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