CN114370757B - Storage bin lump ore pretreatment system and lump ore pretreatment method - Google Patents
Storage bin lump ore pretreatment system and lump ore pretreatment method Download PDFInfo
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- CN114370757B CN114370757B CN202110320877.9A CN202110320877A CN114370757B CN 114370757 B CN114370757 B CN 114370757B CN 202110320877 A CN202110320877 A CN 202110320877A CN 114370757 B CN114370757 B CN 114370757B
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- 238000003860 storage Methods 0.000 title claims abstract description 356
- 238000002203 pretreatment Methods 0.000 title abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 79
- 239000002245 particle Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 238000012216 screening Methods 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims description 331
- 238000000034 method Methods 0.000 claims description 83
- 238000001514 detection method Methods 0.000 claims description 49
- 238000007599 discharging Methods 0.000 claims description 42
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- 238000005245 sintering Methods 0.000 claims description 7
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- 239000002912 waste gas Substances 0.000 abstract description 10
- 230000002349 favourable effect Effects 0.000 abstract 1
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- 239000010410 layer Substances 0.000 description 27
- 239000007789 gas Substances 0.000 description 23
- 238000003723 Smelting Methods 0.000 description 20
- 230000000694 effects Effects 0.000 description 19
- 229910052742 iron Inorganic materials 0.000 description 18
- 238000010586 diagram Methods 0.000 description 9
- 230000035699 permeability Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 6
- 239000002356 single layer Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/22—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being vertical or steeply inclined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
Abstract
The invention provides a bulk ore pretreatment system and a bulk ore pretreatment method of a storage bin, which are characterized in that bulk ore to be treated is conveyed to a bulk ore storage bin, and a heat medium is introduced into the bulk ore storage bin; drying and screening the lump ore to be treated in a lump ore storage bin to obtain dry large-particle lump ore. Aiming at the difficult problem of large water content of natural lump ores, a pretreatment method for directly drying by adopting a lump ore storage bin is provided. The lump ore is dried in a lump ore bin, moisture of the lump ore is removed, and a heat source required for drying is preferably from hot waste gas of a steel mill (such as hot waste gas generated by a blast furnace). The pretreatment method provided by the invention is simple, practical and reliable, and is favorable for engineering popularization and application.
Description
Technical Field
The invention provides a lump ore pretreatment method and a lump ore pretreatment system, in particular relates to a storage bin lump ore pretreatment system and a lump ore pretreatment method, and belongs to the technical field of steel smelting.
Background
Steel is used as an irreplaceable structural and functional material in the industrialized process, and the consumption of the steel occupies more than 95% of the total consumption of metal in a quite long time. Pig iron raw materials required by the iron and steel industry are mainly provided by blast furnace smelting, and improvement and cost reduction of the blast furnace smelting technology have great significance for promoting the development of iron and steel enterprises. The basic link of the blast furnace intensified smelting is concentrate operation, the natural lump ore is used as one of the main components of the furnace charging material, and the addition amount of the natural lump ore can reach 20 percent at most. Because the lump ore has higher moisture content, after the high-moisture lump ore is charged into the furnace, the moisture drying needs to consume energy, and the drying process needs a certain time, so that the coke ratio of the blast furnace is improved, the air permeability of a blast furnace burden layer is influenced, the smelting cost of the blast furnace is increased, and the stability of the furnace condition is influenced. Therefore, the reduction of the moisture content of the lump ore has important significance for reducing the iron-making cost and enhancing the stability of the furnace condition. At present, the lump ore drying system has the problems of high construction cost, low drying efficiency, high energy consumption and the like.
Common furnace charge materials for blast furnaces include sinter, pellet and natural lump ore. The reasonable blast furnace burden structure is that the optimum matching proportion of different iron-containing ores is found out by adjusting the proportion of sinter, pellet and natural lump ore in the charged iron ore, so that various economic and technical indexes of blast furnace smelting under the burden structure are relatively ideal, and the consumption cost of unit pig iron smelting is relatively lowest. Research shows that the cost expenditure of raw material links such as iron ore occupies about 60% of the total cost of pig iron, the market price of lump ore is basically equal to that of fine ore, the cost price is far lower than that of sinter ore and pellet ore, and the improvement of the charging proportion of lump ore is an effective measure for reducing the raw material cost of a blast furnace. At present, the charging proportion of lump ore is generally 5-15%, and the proportion is lower. The reason for this is that the lump ore has high moisture content, generally 8-15%, and the moisture content of the individual harbor steel mill rainy season lump ore is even more than 20%. The problem of high moisture content exists in lump ore charging, and after the high moisture lump ore charging, energy is consumed for moisture drying, a certain time is required in the drying process, so that the coke ratio of the blast furnace is improved.
Therefore, the reduction of the moisture content in the lump ore has important significance for reducing the iron-making cost and enhancing the stability of the furnace condition. At present, the lump ore drying system has the problems of high construction cost, low drying efficiency, high energy consumption and the like.
Disclosure of Invention
Aiming at the problem of high water content of the iron ore lump ore, the water content of the iron ore lump ore is generally 8-15%, and the water content of the rainy season lump ore of individual ports and steel plants is even more than 20%. After the high-moisture lump ore is charged into the furnace, energy is consumed for moisture drying, and a certain time is required for the drying process, so that the coke ratio of the blast furnace is improved. Researches show that the drying treatment of lump ores in the storage bin by using the heat medium is feasible, not only can the moisture of the lump ores entering the furnace be effectively reduced, but also the energy consumption required by drying can be greatly reduced, and the proportion of the lump ores entering the furnace after drying can be improved to a certain extent, so that the smelting cost of the blast furnace is reduced.
In addition, through research finding, the lump ore exists with the state of piling up in the storage silo, especially the existence of fine particle material, leads to the deviation of the whole material gas permeability of feed bin, and the hot gas flow can't pierce through the material body smoothly, leads to drying effect poor, and feed bin upper portion temperature is less than moisture dew point temperature and easily leads to steam condensation in addition, causes harm to dust pelletizing system.
The invention adopts a drying procedure, utilizes the characteristic of abundant hot waste gas resources in the steel process, introduces the hot waste gas into the lump ore bin nearby, directly dries the materials in the bin, and reduces the moisture of the lump ore.
Aiming at the defects of drying lump ore in a storage bin, the invention adopts an ore storage bin drying method with a spiral feeder, a plurality of spiral feeders are arranged at intervals, the lump ore passes through a coarse material channel of the spiral feeder in a rotating way from top to bottom, and sieve holes are arranged on a bottom plate of the coarse material channel of the spiral feeder, so that fine particle materials mixed in the lump ore can be separated into fine material channels positioned below the coarse material channel through the sieve holes, and the purpose of separating the coarse and fine materials of the lump ore is realized. The air current enters the storehouse perpendicularly from the storage silo lower part, discharges to dust pelletizing system from upper portion, and the hot air current is covered with whole storage silo, and the contact effect of hot air current and lump ore is improved, and the storehouse body gas permeability is improved, and drying effect is strengthened. The system adopted by the invention is simple, practical and reliable, fully utilizes the characteristic of sufficient hot waste gas resources of the steel mill, effectively reduces the lump ore pretreatment cost, solves the problem of low lump ore charging addition rate, improves the lump ore charging proportion and the air permeability level of the blast furnace, effectively reduces the production cost of the blast furnace, and improves the forward running level of the blast furnace.
In addition, the invention also discloses a storage bin with a spiral feeder for drying lump ores and a control method. The invention provides a method for directly drying lump ores in a storage bin by utilizing hot waste gas of a steel process aiming at the problem of large water content of natural lump ores. Firstly, hot waste gas is introduced to raise the temperature of the storage bin, and the temperature level is stabilized for a certain time. Then, lump ore materials are added from the upper portion, pass through in a plurality of spiral glassware of follow interval arrangement, the material that rotates the whereabouts is in the storage silo stay for a longer time, and the lump ore distributes more sparse at rotatory whereabouts in-process simultaneously, and the heat transfer effect that the longer dwell time and more sparse distributing mode made lump ore and thermal medium obtains very big promotion. The lump ore continuously falls from the spiral feeder, air flow is continuously introduced into the storage bin, the lump ore is in a flowing state and is subjected to gas-solid exchange with hot waste gas, and hot air flow is distributed in the whole storage bin, so that the moisture content of the lump ore is reduced. The air flow is discharged to a dust removal system from the upper part of the storage bin, and the dried lump ore is conveyed to a blast furnace feeding system from the lower part of the storage bin. The feed inlet and/or the discharge outlet of the storage bin are/is provided with a moisture detector respectively, and the air quantity of the fan is reasonably adjusted according to moisture detection data. The invention can greatly improve the contact efficiency of the hot air flow and the lump ore, improve the air permeability of the bin body and strengthen the drying effect. The popularization of the invention has good economic benefit and environmental benefit, and is hopeful to open up a more stable and efficient way for the development of the lump ore pretreatment process in China.
According to a first embodiment of the invention, a storage bin lump ore pretreatment system is provided.
A bulk ore pretreatment system of a storage bin comprises a bulk ore storage bin, a spiral feeder and a heat medium conveying pipeline. The spiral blanking device is arranged in the lump ore storage bin. The lump ore storage bin is provided with a lump ore feed inlet, a lump ore discharge outlet, a heat medium inlet and a heat medium outlet. The heat medium delivery pipe is connected to the heat medium inlet.
Preferably, the spiral blanking device comprises a spiral blanking plate, and the spiral blanking plate and the inner wall of the lump ore storage bin form a spiral blanking channel from top to bottom. The spiral blanking channel is communicated with the lump ore feeding port and the lump ore discharging port.
Preferably, the spiral feeder has a double-layer spiral surface structure. The spiral blanking device comprises a layer of spiral blanking plates. And a coarse material channel from top to bottom is formed between the spiral blanking plate at the upper layer and the inner wall of the lump ore storage bin. And a fine material channel from top to bottom is formed between the upper layer of the spiral blanking plate and the lower layer of the spiral blanking plate. And sieve holes are formed in the spiral blanking plate on the upper layer. The sieve pores are communicated with the coarse material channel and the fine material channel. The lump ore feeding port and the heat medium outlet are both positioned at the upper part of the lump ore storage bin, and the lump ore discharging port and the heat medium inlet are both positioned at the lower part of the lump ore storage bin. Wherein, lump ore feed inlet and heat medium export all are linked together with the top of coarse fodder passageway, and lump ore discharge gate and heat medium entry all are linked together with the bottom of coarse fodder passageway. The heat medium delivery pipe L is connected to the heat medium inlet. The heat medium enters from the heat medium inlet at the lower part of the lump ore storage bin, then passes upwards through the coarse material channel and is discharged from the heat medium outlet at the upper part of the lump ore storage bin.
Preferably, the spiral feeder has a double-layer spiral surface structure. The spiral blanking device comprises a layer of spiral blanking plates. And a coarse material channel from top to bottom is formed between the spiral blanking plate at the upper layer and the inner wall of the lump ore storage bin. And a fine material channel from top to bottom is formed between the upper layer of the spiral blanking plate and the lower layer of the spiral blanking plate. And sieve holes are formed in the spiral blanking plate on the upper layer. The sieve pores are communicated with the coarse material channel and the fine material channel. The lump ore feeding port and the heat medium outlet are both positioned at the upper part of the lump ore storage bin. The lump ore discharging port and the heat medium inlet are both positioned at the lower part of the lump ore storage bin. Wherein, lump ore feed inlet is linked together with the top of coarse fodder passageway, and the thermal medium export is linked together with the gas vent of fine material passageway, and lump ore discharge gate and thermal medium entry are all linked together with the bottom of coarse fodder passageway. The heat medium delivery pipe is connected to the heat medium inlet. The heat medium enters from a heat medium inlet positioned at the lower part of the lump ore storage bin, then passes through the coarse material channel and the fine material channel upwards and is discharged from a heat medium outlet communicated with the fine material channel.
Preferably, the system further comprises a supplemental heat inlet disposed on a side wall of the lump ore storage bin and in communication with the coarse material passageway. Preferably, the number of the heat supplementing inlets is 1-20, preferably 3-15. All the heat supplementing inlets are communicated with the coarse material channel.
Preferably, the system further comprises a supplemental heat shaft tube. The heat supplementing shaft tube is of a tubular structure with an opening at the bottom end and is positioned on the central axis of the spiral feeder in the vertical direction. The bottom end opening of the heat supplementing shaft tube is communicated with the heat medium inlet. And the wall of the heat supplementing shaft tube, which is positioned on the coarse material channel, is provided with a through hole.
Preferably, a material distribution chamber is arranged at the top of the lump ore storage bin, and a material collecting chamber is arranged at the lower part of the lump ore storage bin. The spiral feeder is positioned between the material distribution chamber and the material collection chamber. The lump ore feeding port is arranged on the material distribution chamber, and the lump ore discharging port is arranged on the material collecting chamber. Wherein: lump ore enters the material distribution chamber from the lump ore feed inlet, then passes through the coarse material channel and enters the material collection chamber. The heat medium inlet is arranged on the material collecting chamber, and the heat medium outlet is arranged on the material distributing chamber. The heat medium enters the lump ore storage bin from the heat medium inlet on the material collecting chamber, is directly contacted with the lump ore for heat exchange, upwards passes through the coarse material channel and is discharged from the heat medium outlet on the material distributing chamber.
Or the heat medium outlet is arranged on the side wall of the lump ore storage bin and communicated with the fine material channel. The heat medium enters the lump ore storage bin from a heat medium inlet on the material collecting chamber, is directly contacted with lump ore for heat exchange, upwards passes through the coarse material channel and the fine material channel, and is discharged from a heat medium outlet on the side wall of the lump ore storage bin.
Preferably, the spiral blanking device further comprises a blanking feeding hole, a coarse material discharging hole and a fine material discharging hole. The blanking feed inlet is arranged at the top end of the coarse fodder channel and is communicated with the material distribution chamber and the coarse fodder channel. The coarse fodder discharge gate sets up in the bottom of coarse fodder passageway to communicate coarse fodder passageway and material collection room. The fine material discharging hole is formed in the side wall of the lump ore storage bin and is communicated with the fine material channel and the outside.
Preferably, a first moisture detection device, a first material flow detection device and a first material temperature detection device are arranged at a lump ore feeding port on the lump ore storage bin.
Preferably, a second moisture detection device is arranged at the lump ore discharging hole of the lump ore storage bin.
Preferably, the system comprises a plurality of said screw feeders. The spiral feeders are arranged in the lump ore storage bin. And the discharging feed inlets of all the spiral discharging devices are communicated with the material distribution chamber. And the coarse material outlet ports of all the spiral feeders are communicated with the material collecting chamber. All the fine material discharging holes of the spiral feeder are communicated with the outside.
Preferably, the number of screw feeders is 1 to 30, preferably 3 to 20, more preferably 5 to 15.
Preferably, the system further comprises a heat medium flow guiding device. The heat medium flow guiding device is arranged in the material collecting chamber, and is provided with a heat medium flow guiding inlet and a heat medium flow guiding outlet. The heat medium inlet is communicated with the heat medium diversion inlet.
Preferably, 1-20 heat medium guiding devices, preferably 2-5 heat medium guiding devices, are arranged in the material collecting chamber. And all the heat medium diversion inlets of the heat medium diversion device are communicated with the heat medium inlet.
Preferably, the system further comprises a dust removal system, the heat medium outlet being connected to the dust removal system by a heat medium outlet pipe.
Preferably, the system further comprises a blast furnace, and the lump ore discharge port is connected to a feed port of the blast furnace through a lump ore conveying device.
According to a second embodiment of the invention, a method for lump ore pretreatment in a storage bin is provided.
A method of lump ore pretreatment in a storage bin or a method of lump ore pretreatment using the system of the first embodiment, the method comprising the steps of:
1) And conveying the lump ore to be treated to a preheated lump ore storage bin, and continuously introducing a heat medium into the lump ore storage bin.
2) And drying and screening the lump ore to be treated in the lump ore storage bin to obtain large-particle dry lump ore.
Preferably, the method further comprises the steps of:
3) Before the lump ore to be treated is conveyed to the lump ore storage bin, the lump ore storage bin is subjected to baking treatment by adopting a thermal medium, and the thermal medium preheats the lump ore storage bin.
4) After heat exchange is carried out between the heat medium and lump ore in the lump ore storage bin, the heat medium is discharged from the lump ore storage bin, and the discharged heat medium is conveyed to the dust removal system.
5) And conveying the large-particle dry lump ore obtained after the drying and screening treatment to a blast furnace.
Preferably, a first moisture detection device, a first material flow detection device and a first material temperature detection device are arranged at a lump ore feeding port of the lump ore storage bin. The first moisture detection device detects the moisture content in the lump ore entering the lump ore storage bin and is marked as W 0 (in%). The first material flow detection device detects the lump ore quantity entering the lump ore storage bin in unit time and is recorded as M 0 ，m 3 . The first material temperature detection device detects the lump ore temperature entering the lump ore storage bin and is marked as T 0 And (3) the temperature is lower than the temperature. Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%). Calculating the flow V, m of the heat medium conveyed to the lump ore storage bin in unit time 3 。
Wherein: c (C) Article (B) Specific heat capacity of lump ore, C Medium (C) Is the specific heat capacity of the thermal medium. ρ Article (B) To bulk density of lump ore ρ Medium (C) Is the density of the thermal medium. T is the temperature when the heat medium is input into the lump ore storage bin.
In unit time, conveying a heat medium with the flow not less than V to a lump ore storage bin, and drying the lump ore in the lump ore storage bin by the heat medium to ensure thatThe moisture content of the lump ore entering the blast furnace is lower than W max ，％。
Preferably, a first moisture detection device is arranged at a lump ore feed inlet of the lump ore storage bin, and the initial air flow speed of the heat medium conveyed to the lump ore storage bin is set to be S 0 M/s. The first moisture detection device detects the moisture content in the lump ore entering the lump ore storage bin and is marked as W 1 (in%). Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%). Judgment of W 1 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 M/s. The method comprises the following steps:
when W is 1 ≤W max And stopping conveying the heat medium into the lump ore storage bin.
When W is 1 When more than or equal to 10 percent, S 1 ＝[1+k 1 ·(W 1 -10％)]×S 0 。
When 10% > W 1 At > 6%, S 1 ＝S 0 。
When W is max ＜W 1 S is less than or equal to 6 percent 1 ＝[1-k 2 ·(6％-W 1 )]×S 0 。
Wherein k is 1 、k 2 For adjusting the coefficient, k of the air flow 1 The value range of (2) is 3-5, k 2 The range of the value of (2) is 1-3.W (W) max Less than or equal to 4 percent. Real-time detection of W 1 The real-time airflow speed of the heat medium conveyed to the lump ore storage bin is adjusted to be S 1 Drying the lump ore in the lump ore storage bin by the heat medium to ensure that the moisture content of the lump ore before entering the blast furnace is lower than W max ，％。
Preferably, a second moisture detection device is arranged at a lump ore discharging hole of the lump ore storage bin, and the initial air flow speed S of the heat medium conveyed to the lump ore storage bin is set 0 M/s. The second moisture detection device detects the moisture content in the lump ore discharged from the lump ore storage bin and is marked as W 2 . Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%). Judgment of W 2 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 2 M/s. The method comprises the following steps:
when W is 2 ≥W max At the time S 2 ＝[1+k 3 ·(W 2 -W max )]×S 0 。
When 0.5W max ＜W 2 ＜W max At the time S 1 ＝S 0 。
When W is 2 ≤0.5W max At the time S 2 ＝[1-k 4 ·(0.5W max -W 2 )]×S 0 。
Wherein k is 3 、k 4 For adjusting the coefficient, k of the air flow 3 The value of (2) is 1-3, k 4 The range of the value of (2) is 0.5-2.W (W) max Less than 6%. Real-time detection of W 2 The real-time airflow speed of the heat medium conveyed to the lump ore storage bin is adjusted to be S 2 Drying the lump ore in the lump ore storage bin by the heat medium to ensure that the moisture content of the lump ore before entering the blast furnace is lower than W max ，％。
Preferably, the heat medium is a heat source generated by the steel process.
Preferably, the heat medium is a heat source released by burning the sintering circular cooler hot exhaust gas, the blast furnace hot blast furnace exhaust gas and the coke oven gas/the blast furnace gas/the converter gas, and is preferably the sintering circular cooler hot exhaust gas and the blast furnace hot blast furnace exhaust gas.
Preferably, the temperature of the heat medium entering the lump ore storage bin is greater than 100 ℃, preferably greater than 150 ℃.
Preferably, the air flow velocity of the heat medium into the lump ore storage bin is 0.01 to 3m/s, preferably 0.03 to 2m/s, more preferably 0.05 to 1m/s.
Preferably, the residence time of the lump ore in the lump ore storage bin is 0.5 to 24 hours, preferably 1 to 12 hours, more preferably 2 to 8 hours.
Preferably, the large-grained agglomerate has a grain size of more than 5mm, preferably more than 6mm, more preferably more than 8mm.
The invention provides a system for carrying out lump ore pretreatment and pretreatment thereof in a storage bin. Aiming at the difficult problem of large water content of natural lump ores, the invention provides a pretreatment method for directly adopting a lump ore storage bin to dry and screen; the lump ore is dried and screened in a lump ore bin, coarse materials and fine materials are screened out while moisture of the lump ore is removed (the lump ore is screened according to granularity or particle size, then the lump ore (coarse materials on the screen) subjected to particle size screening and moisture reduction is conveyed to a blast furnace for smelting, and fine materials under the screen can be conveyed to a sintering batching system, and the materials under the screen enter a sintering process). The heat source required for drying is preferably from steel mill hot off-gas (e.g. hot off-gas from a blast furnace). Compared with the traditional cylinder drying process, the pretreatment method provided by the invention adopts a mature lump ore storage bin to carry out drying and screening pretreatment technology, and has the advantages that the lump ore storage bin is relatively a closed environment, the water removal efficiency of lump ore is high, the difficulty of lump ore charging (blast furnace) is solved, the charging proportion and the ventilation level of the blast furnace lump ore are improved, the production cost of the blast furnace is effectively reduced, and the forward running level of the blast furnace is improved. The popularization of the invention has good economic benefit, social benefit and environmental benefit, and is hopeful to open up a more stable and efficient way for the development of the lump ore pretreatment process in China.
In the invention, the spiral blanking device is of a single-channel structure with a single-layer spiral blanking plate or of a double-channel structure with a double-layer spiral blanking plate. When the spiral blanking device is of a single-channel structure with a single-layer spiral blanking plate, the single-layer spiral blanking plate and the inner wall of the lump ore storage bin form a single-layer spiral blanking channel (only one coarse material channel) from top to bottom. When the spiral blanking device is of a double-channel structure with a double-layer spiral blanking plate, the double-layer spiral blanking plate is of a parallel spiral structure from top to bottom, and meanwhile the double-layer spiral blanking plate divides the inner cavity of the lump ore storage bin into two parallel spiral channels (a coarse material channel and a fine material channel, and the fine material channel is positioned below the coarse material channel) from top to bottom. And sieve holes are formed in the upper spiral blanking plate (namely, the bottom plate of the coarse material channel) and are communicated with the coarse material channel and the fine material channel. In the process that the lump ore moves from the lump ore storage bin to the top, large-particle lump ore passes through the coarse material channel, fine particle materials mixed in the large-particle lump ore enter the fine material channel through the sieve holes, and the coarse material channel and the fine material channel are respectively provided with mutually independent discharge holes for collecting coarse materials and fine materials, so that the screening process of the lump ore is realized.
In the invention, when the spiral feeder is of a double-channel structure, the coarse material channel and the fine material channel are uniformly divided into multiple layers from top to bottom, for example, the coarse material channel is set to be 1, the fine material channel is set to be 2, and the coarse material channel and the fine material channel are distributed from top to bottom in the lump ore storage bin in a mode of 1-2-1-2-1-2-1. And all or part of the optional coarse material channels can be provided with heat supplementing inlets (selected according to the actual working condition requirements). All or part of the fine material channels on any layer can be selectively provided with fine material discharge holes (the fine material discharge holes are selected according to the actual working condition, but an independent fine material discharge hole is required to be arranged at the bottom end of the fine material channel).
Further, in the present invention, the flow of the heat medium is divided into three modes: the first concrete is: the spiral feeder is a single layer, and the heat medium inlet is communicated with a discharge hole of the spiral feeder; the heat medium outlet is communicated with a discharge port of the spiral blanking device; the heat medium directly enters from the heat medium inlet on the lump ore storage bin, then passes through the spiral feeder upwards and is discharged from the heat medium outlet on the ore storage bin. The materials flow from top to bottom, the heat medium flows from bottom to top, and the lump ore and the heat medium directly exchange heat to realize quick drying.
The second is: the spiral blanking device is of a double-layer structure with a coarse material channel and a fine material channel, and the coarse material channel and the fine material channel are communicated through a sieve pore; the heat medium inlet is communicated with a discharge port of the spiral feeder through the material flow collecting chamber; the heat medium outlet is communicated with a discharge port of the spiral feeder through the material distribution chamber. Then, the heat medium directly enters the material collecting chamber from the heat medium inlet on the lump ore storage bin, then upwards passes through the coarse material channel and the fine material channel of the spiral discharger, then enters the material distributing chamber, and finally is discharged from the heat medium outlet on the ore storage bin. The materials flow from top to bottom, the heat medium flows from bottom to top, the lump ore and the heat medium directly exchange heat to realize quick drying, and meanwhile, the fine materials in the lump ore are continuously screened into a fine material channel, namely, the separation of the coarse and fine materials is realized during drying, and the working efficiency is improved.
The third is: the spiral blanking device is of a double-layer structure with a coarse material channel and a fine material channel, and the coarse material channel and the fine material channel are communicated through a sieve pore; the heat medium inlet is communicated with a discharge port of the spiral feeder through the material flow collecting chamber; the heat medium outlet is directly communicated with the fine material channel. The heat medium directly enters the material collecting chamber from the heat medium inlet on the lump ore storage bin, then passes through the coarse material channel and the fine material channel of the spiral discharger upwards and is directly discharged from the heat medium outlet connected with the fine material channel. The materials flow from top to bottom, the heat medium flows from bottom to top, the lump ore and the heat medium directly exchange heat to realize quick drying, fine materials in the lump ore are continuously screened into a fine material channel, coarse and fine materials are separated during drying, and the working efficiency is improved. Meanwhile, the heat medium finally enters the fine material channel from the coarse material channel through the sieve holes and is discharged from the heat medium outlet. The screening effect is improved while the drying and screening of lump ores are realized, and the blocking of fine materials to screen holes can be effectively prevented. Greatly improves the screening effect.
According to the invention, the heat medium flow guiding device is arranged in the lump ore drying bin, so that the heat medium is uniformly distributed in the lump ore drying bin, the heat medium is in full contact with the lump ore, and the moisture content in the lump ore is effectively reduced. The method ensures that the lump ore is fully contacted with the heat medium, improves the dehydration effect of the lump ore, ensures that the moisture content in the lump ore before entering the blast furnace meets the requirements, thereby reducing the energy consumption of the blast furnace, ensuring the normal operation of the blast furnace process, improving the quality of blast furnace products and saving the production cost.
In the present invention, the heat medium may be hot exhaust gas having a relatively high temperature, or may be hot air after being subjected to heat treatment. Generally, the temperature of the heat medium is not less than 100 ℃.
In the invention, the lump ore drying bin is used as a place and a device for the lump ore drying process, the existing equipment resources are fully utilized, the dehydration process of the lump ore is realized, and a new equipment device is not additionally added. The method is characterized in that a heat medium inlet and a heat medium outlet are formed in an original lump ore drying bin.
Aiming at the problems of high moisture content in lump ores and low addition amount of the lump ore serving as a blast furnace raw material, the lump ore storage bin is adopted to carry out drying pretreatment on the lump ores, and a heat medium is conveyed to the lump ore storage bin; in the lump ore storage bin, the heat medium dries the lump ore, the moisture in the lump ore is evaporated and taken away, and the heat medium is discharged out of the lump ore storage bin along with the heat exchange, so that the purpose of drying the lump ore is achieved.
Preferably, before the lump ore to be treated is conveyed to the lump ore storage bin, the lump ore storage bin is preheated by adopting a thermal medium, so that the internal temperature of the lump ore storage bin is increased, the phenomenon that moisture is condensed when the lump ore with high moisture content enters the lump ore storage bin is avoided, and the drying effect of the lump ore in the lump ore storage bin is further improved.
Preferably, after the heat medium exchanges heat with the lump ore in the lump ore storage bin, the heat medium takes away moisture in the lump ore, and meanwhile, the heat medium can remove dust on the surface of the lump ore, so that the content of the dust in the lump ore storage bin is reduced, the air permeability of the heat medium in the lump ore storage bin is increased, and the drying efficiency is improved. Preferably, the heat medium discharged from the lump ore storage bin is subjected to dust removal treatment by a dust removal system, so that the pollution of the discharged heat medium to the environment is reduced. Meanwhile, dust particles collected through the dust removal system can be used as sintering raw materials, so that resource recycling is realized.
Preferably, the lump ore to be treated is conveyed to the lump ore storage bin for drying, and is also subjected to screening treatment, and in the descending process in the lump ore storage bin, fine materials continuously enter the fine material channel from the sieve holes, so that gaps among the lump ores in the coarse material channel are improved, the air permeability of the coarse material channel and the material collecting chamber is ensured, and the drying effect of a heat medium on the lump ore is improved.
In the invention, after the lump ore is screened according to the granularity or the grain size by the screening device (the screen holes are arranged on the spiral blanking device), the oversize material meeting the grain size requirement and the moisture content requirement on the screen is conveyed to the blast furnace by the conveying device, so that the grain size and the moisture content of the raw material entering the blast furnace are ensured, and the smelting effect of the blast furnace is ensured.
In the invention, a first moisture detection device, a first material flow detection device and a first material temperature detection device are arranged at the position of a material feed inlet of a lump ore storage bin, the first moisture detection device detects the moisture content in lump ore entering the lump ore storage bin, the first material flow detection device detects the lump ore quantity entering the lump ore storage bin in unit time, the first material temperature detection device detects the lump ore temperature entering the lump ore storage bin, and the upper limit of the moisture content of lump ore entering a blast furnace is set to be W max (in%). The flow rate of the heat medium conveyed to the lump ore storage bin in unit time can be accurately known through calculation, so that the water content of the lump ore entering the blast furnace is ensured to be lower than W max ，％。
In the invention, a first moisture detection device is arranged at a lump ore feed inlet of a lump ore storage bin, the initial airflow speed of a heat medium conveyed to the lump ore storage bin is set, the first moisture detection device detects the moisture content in lump ore entering the lump ore storage bin, and the upper limit of the moisture content of lump ore entering a blast furnace is set to be W max (in%). Comparing the detected water content in the lump ore at the feed inlet with the upper limit of the water content of the lump ore entering the blast furnace, and adjusting the real-time air flow speed of the heat medium conveyed to the lump ore storage bin so as to ensure that the water content of the lump ore entering the blast furnace is lower than W max ，％。
In the invention, a second moisture detection device is arranged at a lump ore discharging hole of a lump ore storage bin, the initial airflow speed of a heat medium conveyed to the lump ore storage bin is set, the second moisture detection device detects the moisture content in the lump ore discharged from the lump ore storage bin, and the upper limit of the moisture content of the lump ore entering a blast furnace is set as W max The water content in the lump ore at the discharge hole and the upper limit of the water content of the lump ore entering the blast furnace are detectedComparing, adjusting the real-time air flow speed of the heat medium conveyed to the lump ore storage bin, thereby ensuring that the water content of the lump ore before entering the blast furnace is lower than W max ，％。
According to the invention, the lump ore is dried in the storage bin by utilizing the hot waste gas of the steel process, so that not only can the water content of the lump ore entering the furnace be effectively reduced, but also the energy consumption required by drying can be greatly reduced, and the proportion of the lump ore entering the furnace after drying can be improved to a certain extent, thereby reducing the smelting cost of the blast furnace.
Further, to the inhomogeneous problem of lump ore in lump ore storage silo and heat medium contact, lump ore exists with the state of piling up in the storage silo, especially the existence of fine particle material, leads to the deviation of the whole material gas permeability of feed bin, and the hot air current can't penetrate the material body smoothly, leads to drying effect not good enough, and feed bin upper portion temperature is less than moisture dew point temperature and easily leads to steam condensation in addition, causes harm to dust pelletizing system. Aiming at the defects of drying lump ore in a storage bin, the invention adopts the lump ore storage bin with the spiral feeder, a plurality of spiral feeders are arranged at intervals, and lump ore enters a material distribution chamber from a lump ore feed inlet and then flows through a coarse material channel of the spiral feeder in a spiral manner and enters a material collection chamber. The heat medium inlet is arranged on the material collecting chamber. The heat medium outlet is arranged on the material distribution chamber. The heat medium enters the lump ore storage bin from the heat medium inlet on the material collecting chamber, is directly contacted with the lump ore for heat exchange, passes through the spiral feeder upwards and is discharged from the heat medium outlet on the material distributing chamber. Thereby enhancing heat exchange between the gas and the solid. The air current enters the storehouse perpendicularly from the storage silo lower part, discharges to dust pelletizing system from upper portion, and the hot air current is covered with whole storage silo, and the contact effect of hot air current and lump ore is improved, and the storehouse body gas permeability is improved, and drying effect is strengthened.
In the invention, a spiral blanking device is arranged in a lump ore storage bin, a coarse material channel and a fine material channel are arranged on the spiral blanking device, wherein the coarse material channel is positioned above the fine material channel, and sieve holes communicated with the fine material channel are arranged on the bottom plate surface of the coarse material channel. Lump ore enters the material distribution chamber from the lump ore feed inlet, then passes through the coarse material channel and enters the material collection chamber. In the secondary process, fine materials entrained on large-particle lump ores fall into a fine material channel through the sieve holes, so that the aim of separating coarse and fine materials while drying the lump ores is fulfilled. The invention designs a double-channel spiral feeder with sieve holes, and the drying and screening of lump ore can be realized through one procedure. The lump ore screening device is not required to be additionally arranged for screening lump ores, so that the production cost is reduced, and meanwhile, the production efficiency is greatly improved. It should be noted that if an independent screening device is additionally provided, new fine materials are inevitably generated due to abrasion among lump ores in the process of conveying the obtained large-particle lump ores to the drying device, so that the lump ore drying effect and the subsequent blast furnace smelting effect are affected.
In the invention, the system also comprises a heat medium flow guiding device, so that the heat medium is uniformly distributed in the lump ore storage bin. The heat medium guiding device can adopt a structure of one (or a plurality of) heat medium guiding inlets and a plurality of heat medium guiding outlets, so that the dispersibility of the heat medium is improved.
By adopting the technical scheme provided by the invention, the addition proportion of lump ore in the blast furnace raw material can be increased, and through experiments, the addition amount can reach 30% at most by adopting the technical scheme provided by the invention. Greatly increases the dosage ratio of lump ore in the working procedure of the blast furnace, thereby reducing the running cost of the blast furnace.
In the present invention, the height of the lump ore storage bin is 3 to 100m, preferably 5 to 80m, more preferably 10 to 50m.
In the structure of the lump ore storage bin, the height ratio of the material distribution chamber to the spiral feeder to the material collection chamber is 1:0.1-50:0.5-10, preferably 1:1-20:1-5.
In the present invention, the ratio of the height of the heat exchange chamber to the length of the screw discharger is 1:0.2 to 1, preferably 1:0.5 to 0.9, more preferably 1:0.6 to 0.8.
In the invention, a lump ore feed inlet is arranged at the top of a lump ore storage bin. The lump ore discharge port is arranged at the bottom of the lump ore storage bin. The heat medium inlet is arranged at the bottom of the lump ore storage bin. The heat medium outlet is arranged at the top of the lump ore storage bin. The coarse fodder discharge gate sets up in the bottom of coarse fodder passageway to communicate coarse fodder passageway and material collection room. The fine material discharging hole is arranged at the bottom end of the fine material channel, and is communicated with the fine material channel and the outside after passing through the outer walls of the spiral feeder and the lump ore storage bin.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
1. the invention adopts the lump ore storage bin to carry out drying pretreatment on lump ores, and conveys a heat medium to the lump ore storage bin; in the lump ore storage bin, the heat medium dries the lump ore, the moisture in the lump ore is evaporated and taken away, and the heat medium is discharged out of the lump ore storage bin along with the heat exchange, so that the purpose of drying the lump ore is achieved.
2. Aiming at the defects of drying lump ore in a storage bin, the invention adopts a spiral blanking drying and screening method, a plurality of spiral blanking devices are arranged at intervals, large-particle lump ore spirally passes through a coarse material channel, and small-particle lump ore enters a fine material channel through a sieve hole and is discharged. The heat medium and the lump ore are subjected to direct heat exchange, so that the drying effect of the lump ore in the lump ore storage bin is greatly improved.
3. In the invention, in the process of rotating and falling of the lump ore in the spiral feeder, the heat exchange effect of the lump ore and the heat medium is greatly improved by the longer residence time and the more dispersed distribution mode. The lump ore continuously falls from the spiral feeder, air flow is continuously introduced into the storage bin, the lump ore is in a flowing state and is subjected to gas-solid exchange with hot waste gas, and hot air flow is distributed in the whole storage bin, so that the moisture content of the lump ore is reduced.
4. The system of the invention also comprises a heat medium guiding device, thereby ensuring that the heat medium is uniformly distributed in the lump ore storage bin.
Drawings
FIG. 1 is a schematic diagram of a storage bin lump ore pretreatment system.
Fig. 2 is a cross-sectional view of the present invention with a single pass screw type blanking machine.
FIG. 3 is a schematic structural view of a single-layer spiral blanking plate of the present invention.
FIG. 4 is a schematic cross-sectional view of a two-channel screw feeder of the present invention.
FIG. 5 is a schematic structural view of a double-layer spiral blanking plate of the present invention.
FIG. 6 is a block mine storage bin structure diagram of the present invention with top end venting.
Fig. 7 is a block mine storage bin structure diagram of the invention with side wall exhaust.
FIG. 8 is a block mine storage bin structure diagram with multiple screw downers and top vented according to the present invention.
Fig. 9 is a block mine storage bin structure diagram with a plurality of screw feeders and side wall exhaust according to the present invention.
FIG. 10 is a schematic distribution diagram of the present invention with a plurality of screw feeders.
Fig. 11 is a structural view of a heat medium flow guiding device of the present invention.
FIG. 12 is a process flow diagram of a method for lump ore pretreatment in a storage bin according to the invention.
FIG. 13 is a process flow diagram of the method of the present invention for inlet moisture detection and regulation control.
FIG. 14 is a process flow diagram of outlet moisture detection and regulation control according to the method of the present invention.
Reference numerals: 1: lump ore storage bin; 101: lump ore feed inlets; 102: a lump ore discharge port; 103: a thermal medium inlet; 104: a thermal medium outlet; 105: a material distribution chamber; 106: a material collection chamber; 107: a heat supplementing inlet; 108: a heat supplementing shaft tube; 109: a through hole; 201: a first moisture detecting device; 301: a first material flow rate detection device; 401: a first material temperature detection device; 202: a second moisture detecting device; 5: a spiral blanking device; 501: a coarse material channel; 502: a fines passage; 503: a sieve pore; 504: a blanking feed inlet; 505: a coarse material discharge port; 506: a fine material outlet; 6: a blast furnace; 7: a heat medium guiding device; 701: a thermal medium diversion inlet; 702: a thermal medium flow guiding outlet; 8: a dust removal system; l1: a heat medium delivery pipe; l2: a heat medium discharge pipe; l3: lump ore conveying device.
Detailed Description
The following examples illustrate the technical aspects of the invention, and the scope of the invention claimed includes but is not limited to the following examples.
Example 1
As shown in fig. 1, a storage bin lump ore pretreatment system comprises a lump ore storage bin 1, a spiral feeder 5 and a heat medium conveying pipeline L1. The spiral blanking device 5 is arranged in the lump ore storage bin 1. The lump ore storage bin 1 is provided with a lump ore feed inlet 101, a lump ore discharge outlet 102, a heat medium inlet 103 and a heat medium outlet 104. The heat medium delivery pipe L1 is connected to the heat medium inlet 103. The lump ore discharge port 102 is connected to a feed port of the blast furnace 6.
Example 2
Example 1 is repeated, as shown in fig. 2 and 3, except that the screw feeder 5 includes a screw feeder plate 507, and the screw feeder plate 507 and the inner wall of the lump ore storage bin 1 form a screw feeder channel 508 from top to bottom. The spiral blanking channel 508 is communicated with the lump ore feed inlet 101 and the lump ore discharge outlet 102.
Example 3
Example 1 was repeated, as shown in fig. 2 and 3, except that the screw feeder 5 had a double screw structure. The screw feeder 5 includes 2 layers of screw feeder plates 507. A coarse material channel 501 from top to bottom is formed between the spiral blanking plate 50701 at the upper layer and the inner wall of the lump ore storage bin 1. A fine material channel 502 from top to bottom is formed between the upper spiral blanking plate 50701 and the lower spiral blanking plate 50702. The spiral blanking plate 50701 at the upper layer is provided with a sieve opening 503. The mesh 503 communicates the coarse material passage 501 and the fine material passage 502. The lump ore feed inlet 101 and the heat medium outlet 104 are both positioned at the upper part of the lump ore storage bin 1, and the lump ore discharge outlet 102 and the heat medium inlet 103 are both positioned at the lower part of the lump ore storage bin 1. Wherein, lump ore feed inlet 101 and heat medium outlet 104 are all linked together with the top of coarse fodder passageway 501, and lump ore discharge outlet 102 and heat medium inlet 103 are all linked together with the bottom of coarse fodder passageway 501. The heat medium delivery pipe L1 is connected to the heat medium inlet 103. The heat medium enters from the heat medium inlet 103 at the lower part of the lump ore storage bin 1 and then passes upward through the coarse material passage 501 to be discharged from the heat medium outlet 104 at the upper part of the lump ore storage bin 1.
Example 4
Example 1 was repeated, as shown in fig. 5, except that the screw feeder 5 had a double screw structure. The screw feeder 5 includes 2 layers of screw feeder plates 507. A coarse material channel 501 from top to bottom is formed between the spiral blanking plate 50701 at the upper layer and the inner wall of the lump ore storage bin 1. A fine material channel 502 from top to bottom is formed between the upper spiral blanking plate 50701 and the lower spiral blanking plate 50702. The spiral blanking plate 50701 at the upper layer is provided with a sieve opening 503. The mesh 503 communicates the coarse material passage 501 and the fine material passage 502. Both the lump ore feed inlet 101 and the heat medium outlet 104 are located at the upper part of the lump ore storage bin 1. Both the lump ore discharging port 102 and the heat medium inlet 103 are positioned at the lower part of the lump ore storage bin 1. Wherein, lump ore feed inlet 101 is linked with the top of coarse fodder passageway 501, and heat medium outlet 104 is linked with the gas vent of fine fodder passageway 502, and lump ore discharge outlet 102 and heat medium inlet 103 are linked with the bottom of coarse fodder passageway 501. The heat medium delivery pipe L1 is connected to the heat medium inlet 103. The heat medium enters from the heat medium inlet 103 at the lower part of the lump ore storage bin 1, then passes upward through the coarse material passage 501 and the fine material passage 502, and is discharged from the heat medium outlet 104 at the upper part of the lump ore storage bin 1.
Example 5
Example 4 is repeated except that the system further comprises a supplementary heat inlet 107, said supplementary heat inlet 107 being provided on a side wall of the lump ore storage bin 1 and being in communication with the coarse material channel 501. Preferably, the number of the heat supplementing inlets is 1-20, preferably 3-15. All of the make-up inlets 107 are in communication with the coarse material channel 501.
Example 6
Example 5 is repeated except that the system further includes a supplemental heat pipe 108. The heat supplementing shaft tube 108 is a tubular structure with an opening at the bottom end and is positioned on the central axis of the spiral feeder 5 in the vertical direction. The bottom end opening of the heat supplementing shaft tube 108 is communicated with the heat medium inlet 103. The heat supplementing shaft tube 108 is provided with a through hole 109 on the wall of the coarse material channel 501.
Example 7
Example 6 was repeated, as shown in fig. 6, except that the top of the lump ore storage bin 1 was provided with a material distribution chamber 105, and the lower portion of the lump ore storage bin 1 was provided with a material collection chamber 106. The screw feeder 5 is located between the material distribution chamber 105 and the material collection chamber 106. Lump ore feed port 101 is provided in material distribution chamber 105 and lump ore discharge port 102 is provided in material collection chamber 106. Wherein: lump ore enters the material distribution chamber 105 from the lump ore feed inlet 101 and then passes through the coarse material channel 501 to enter the material collection chamber 106. The heat medium inlet 103 is provided in the material collecting chamber 106, and the heat medium outlet 104 is provided in the material distributing chamber 105. The heat medium enters the lump ore storage bin 1 from the heat medium inlet 103 on the material collecting chamber 106, exchanges heat with the lump ore in a direct contact manner, passes through the coarse material channel 501 upwards, and is discharged from the heat medium outlet 104 on the material distributing chamber 105.
Example 8
Example 7 is repeated, as shown in fig. 7, except that the heat medium outlet 104 is provided on the side wall of the lump ore storage bin 1 and communicates with the fine material passage 502. The heat medium enters the lump ore storage bin 1 from the heat medium inlet 103 on the material collecting chamber 106, is directly contacted with the lump ore for heat exchange, passes through the coarse material channel 501 and the fine material channel 502 upwards, and is discharged from the heat medium outlet 104 on the side wall of the lump ore storage bin 1.
Example 9
Example 8 is repeated except that the screw discharger 5 further comprises a discharge inlet 504, a coarse discharge outlet 505 and a fine discharge outlet 506. The discharging inlet 504 is disposed at the top end of the coarse fodder channel 501, and communicates with the material distributing chamber 105 and the coarse fodder channel 501. The coarse fodder discharging port 505 is arranged at the bottom end of the coarse fodder channel 501 and is communicated with the coarse fodder channel 501 and the material collecting chamber 106. The fine material outlet 506 is arranged on the side wall of the lump ore storage bin 1 and is communicated with the fine material channel 502 and the outside.
Example 10
Repeating example 9, a first moisture detecting device 201, a first material flow detecting device 301 and a first material temperature detecting device 401 are provided at the lump ore feed inlet 101 on the lump ore storage bin 1.
Example 11
The embodiment 10 is repeated except that the second moisture detecting device 202 is provided at the lump ore discharging port 102 of the lump ore storage bin 1.
Example 12
Example 11 is repeated, as shown in fig. 8, except that the system comprises a plurality of screw feeders 5. The plurality of spiral feeders 5 are all arranged inside the lump ore storage bin 1. The discharge inlets 504 of all the screw feeders 5 are communicated with the material distribution chamber 105. All coarse material outlets 505 of the screw feeders 5 are connected to the material collection chamber 106. All the fine material discharging ports 506 of the screw downer 5 are communicated with the outside. The number of the screw feeders 5 is 8.
Example 13
Example 12 is repeated as shown in fig. 9, except that the system further comprises a heat medium guiding device 7. The heat medium guiding device 7 is arranged in the material collecting chamber 106, and a heat medium guiding inlet 701 and a heat medium guiding outlet 702 are arranged on the heat medium guiding device 7. The heat medium inlet 103 communicates with the heat medium guiding inlet 701. The material collecting chamber 106 is internally provided with 2 heat medium guiding devices 7, and heat medium guiding inlets 701 of the 2 heat medium guiding devices 7 are communicated with the heat medium inlet 103.
Example 14
Example 13 is repeated except that the system further includes a dust removing system 8, and the heat medium outlet 104 is connected to the dust removing system 8 through a heat medium discharging pipe L2.
Example 15
Example 14 was repeated except that the system further included a blast furnace 6, and the lump ore discharge port 102 was connected to the feed port of the blast furnace 6 through the lump ore conveying device L3.
Example 16
A method of lump ore pretreatment in a storage bin, the method comprising the steps of:
1) And conveying the lump ore to be treated to the preheated lump ore storage bin 1, and continuously introducing a heat medium into the lump ore storage bin 1.
2) And drying and screening the lump ore to be treated in the lump ore storage bin 1 to obtain large-particle dry lump ore.
Example 17
Example 16 was repeated except that the method further comprises the steps of:
3) Before the lump ore to be treated is conveyed to the lump ore storage bin 1, the lump ore storage bin 1 is subjected to baking treatment by adopting a thermal medium, and the thermal medium preheats the lump ore storage bin 1.
4) After heat exchange is carried out between the heat medium and lump ore in the lump ore storage bin 1, the heat medium is discharged from the lump ore storage bin 1, and the discharged heat medium is conveyed to a dust removal system.
5) And conveying the large-particle dry lump ore obtained after the drying and screening treatment to a blast furnace.
Example 18
A method of lump ore pretreatment in a storage bin, the method comprising the steps of:
1) Before the lump ore to be treated is conveyed to the lump ore storage bin 1, the lump ore storage bin 1 is subjected to baking treatment by adopting a thermal medium, and the thermal medium preheats the lump ore storage bin 1.
2) And conveying the lump ore to be treated to the preheated lump ore storage bin 1, and continuously introducing a heat medium into the lump ore storage bin 1.
3) And drying and screening the lump ore to be treated in the lump ore storage bin 1 to obtain large-particle dry lump ore.
As shown in fig. 10, a first moisture detecting device 201, a first material flow detecting device 301, and a first material temperature detecting device 401 are provided at the lump ore feed inlet 101 of the lump ore storage bin 1. The first moisture detecting device 201 detects the moisture content of the lump ore entering the lump ore storage bin 1, denoted as W 0 (in%). The first material flow detecting device 301 detects the lump ore amount entering the lump ore storage bin 1 in unit time and is marked as M 0 ，m 3 . The first material temperature detecting device 401 detects the lump ore temperature entering the lump ore storage bin 1, and is marked as T0 and DEG C. Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%). Calculating the flow V, m of the heat medium delivered to the lump ore storage bin 1 in unit time 3 。
Wherein: c (C) Article (B) Specific heat capacity of lump ore, C Medium (C) Is the specific heat capacity of the thermal medium. ρ Article (B) To bulk density of lump ore ρ Medium (C) Is the density of the thermal medium. T is the temperature when the heat medium is input into the lump ore storage bin 1.
In unit time, conveying a heat medium with the flow not less than V to the lump ore storage bin 1, and drying the lump ore in the lump ore storage bin 1 by the heat medium so that the moisture content of the lump ore before entering a blast furnace is lower than W max ，％。
Example 19
A method of lump ore pretreatment in a storage bin, the method comprising the steps of:
1) Before the lump ore to be treated is conveyed to the lump ore storage bin 1, the lump ore storage bin 1 is subjected to baking treatment by adopting a thermal medium, and the thermal medium preheats the lump ore storage bin 1.
2) And conveying the lump ore to be treated to the preheated lump ore storage bin 1, and continuously introducing a heat medium into the lump ore storage bin 1.
3) And drying and screening the lump ore to be treated in the lump ore storage bin 1 to obtain large-particle dry lump ore.
As shown in fig. 11, a first moisture detecting device 201 is provided at the lump ore feed inlet 101 of the lump ore storage bin 1, and the initial air flow rate of the heat medium fed to the lump ore storage bin 1 is set to S 0 M/s. The first moisture detecting device 201 detects the moisture content of the lump ore entering the lump ore storage bin 1, denoted as W 1 (in%). Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%). Judgment of W 1 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 1 M/s. The method comprises the following steps:
when W is 1 ≤W max When this occurs, the conveyance of the heat medium into the lump ore storage bin 1 is stopped.
When W is 1 When more than or equal to 10 percent, S 1 ＝[1+k 1 ·(W 1 -10％)]×S 0 。
When 10% > W 1 At > 6%, S 1 ＝S 0 。
When W is max ＜W 1 S is less than or equal to 6 percent 1 ＝[1-k 2 ·(6％-W 1 )]×S 0 。
Wherein k is 1 、k 2 For adjusting the coefficient, k of the air flow 1 The value range of (2) is 3-5, k 2 The range of the value of (2) is 1-3.W (W) max Less than or equal to 4 percent. Real-time detection of W 1 The real-time air flow speed of the heat medium conveyed to the lump ore storage bin 1 is adjusted to be S 1 Drying the lump ore in the lump ore storage bin 1 by the heat medium so that the moisture content of the lump ore before entering the blast furnace is lower than W max ，％。
Example 20
A method of lump ore pretreatment in a storage bin, the method comprising the steps of:
1) Before the lump ore to be treated is conveyed to the lump ore storage bin 1, the lump ore storage bin 1 is subjected to baking treatment by adopting a thermal medium, and the thermal medium preheats the lump ore storage bin 1.
2) And conveying the lump ore to be treated to the preheated lump ore storage bin 1, and continuously introducing a heat medium into the lump ore storage bin 1.
3) And drying and screening the lump ore to be treated in the lump ore storage bin 1 to obtain large-particle dry lump ore.
As shown in fig. 12, a second moisture detecting device 202 is provided at the lump ore discharging port 102 of the lump ore storage bin 1, and the initial air flow speed S of the heat medium fed to the lump ore storage bin 1 is set 0 M/s. The second moisture detecting device 202 detects the moisture content of the lump ore discharged from the lump ore storage bin 1 and is marked as W 2 . Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%). Judgment of W 2 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 2 M/s. The method comprises the following steps:
when W is 2 ≥W max At the time S 2 ＝[1+k 3 ·(W 2 -W max )]×S 0 。
When 0.5W max ＜W 2 ＜W max At the time S 1 ＝S 0 。
When W is 2 ≤0.5W max At the time S 2 ＝[1-k 4 ·(0.5W max -W 2 )]×S 0 。
Wherein k is 3 、k 4 For adjusting the coefficient, k of the air flow 3 The value of (2) is 1-3, k 4 The range of the value of (2) is 0.5-2.W (W) max Less than 6%. Real-time detection of W 2 The real-time air flow speed of the heat medium conveyed to the lump ore storage bin 1 is adjusted to be S 2 Drying the lump ore in the lump ore storage bin 1 by the heat medium so that the moisture content of the lump ore before entering the blast furnace is lower than W max ，％。
Example 21
Example 18 was repeated except that the heat medium was a sintered ring cooler hot exhaust gas.
Example 22
Example 19 was repeated except that the heat medium was blast furnace hot blast stove off-gas.
Example 23
Example 20 was repeated except that the heat medium was a heat source released by coke oven gas/blast furnace gas/converter gas combustion.
Example 24
Example 18 was repeated except that the lump ore remained in the lump ore storage bin 1 for 3 hours.
Example 25
Example 19 was repeated except that the lump ore remained in the lump ore storage bin 1 for 5 hours.
Example 26
Example 20 was repeated except that the retention time of lump ore in the lump ore storage bin 1 was 8h.
Example 27
Example 19 was repeated except that the large-grained agglomerate had a grain size of greater than 6mm.
Example 28
Example 20 was repeated except that the large-grained agglomerate had a grain size of greater than 8mm.
Application example 1
The method of example 18 was used in a Zhanjiang iron and steel smeltery, and the first moisture detecting device 201 detected the moisture content in the lump ore entering the lump ore storage bin 1 to be 11%. The first material flow detection device 301 detects the lump ore amount entering the lump ore storage bin 1 in unit time to be 130m 3 . The first material temperature detecting means 401 detects the lump ore temperature entering the lump ore storage bin 1 to be 27 ℃. According to the requirements of blast furnace conditions, the upper limit of the water content of lump ore entering the blast furnace is set to be 4 percent. The specific heat capacity of the lump ore was 440[ kJ/(m) 3 ·℃)]The method comprises the steps of carrying out a first treatment on the surface of the Bulk density of lump ore is 2800kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The specific heat capacity of the heat medium was 1300[ kJ/(m) 3 ·℃)]The method comprises the steps of carrying out a first treatment on the surface of the The density of the heat medium was 1.36kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The temperature at the time of the heat medium input into the lump ore storage bin 1 was 175 deg.c, and the flow rate V, m of the heat medium fed to the lump ore storage bin 1 per unit time (calculated as 1 h) was calculated 3 ；
The conveying flow rate is not less than 6172.08m in unit time 3 And (3) heating medium/h to the lump ore storage bin 1, and drying the lump ore in the lump ore storage bin 1 by the heating medium so that the water content of the lump ore entering the blast furnace is lower than 4%.
Application example 2
The method of example 18 was used in a Zhanjiang iron and steel smeltery, and the first moisture detecting device 201 detected the moisture content in the lump ore entering the lump ore storage bin 1 to be 14%. The first material flow detection device 301 detects the lump ore amount entering the lump ore storage bin 1 in unit time to be 150m 3 . The first material temperature detecting means 401 detects the lump ore temperature entering the lump ore storage bin 1 to be 30 ℃. According to the requirements of blast furnace conditions, the upper limit of the water content of lump ore entering the blast furnace is set to be 3.5 percent. The specific heat capacity of the lump ore was 440[ kJ/(m) 3 ·℃)]The method comprises the steps of carrying out a first treatment on the surface of the Bulk density of lump ore is 2800kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The specific heat capacity of the heat medium was 1300[ kJ/(m) 3 ·℃)]The method comprises the steps of carrying out a first treatment on the surface of the The density of the heat medium was 1.36kg/m 3 The temperature of the heat medium when being input into the lump ore storage bin 1 is 18Calculating the flow V, m of the heat medium delivered to the lump ore storage bin 1 in a unit time (calculated by 1 h) at 0 DEG C 3 ；
The conveying flow rate is not less than 9603.22m in unit time 3 And (3) heating medium/h to the lump ore storage bin 1, and drying the lump ore in the lump ore storage bin 1 by the heating medium so that the water content of the lump ore before entering a blast furnace is lower than 3.5%.
Application example 3
The method of example 19 was used in a Zhanjiang iron and steel smelting plant, in which a first moisture detecting device 201 was provided at the lump ore feed port of the lump ore storage bin 1, and the initial air flow rate S of the heat medium fed to the lump ore storage bin 1 was set 0 Is 0.15m/s. The first moisture detecting device 201 detects the moisture content W in the lump ore entering the lump ore storage bin 1 1 12%. Setting the upper limit W of the water content of lump ore entering the blast furnace according to the requirements of blast furnace conditions max 4%. Judgment of W 1 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 1 ，m/s；k 1 The value of (2) is 4;
due to W 1 ≥10％，S 1 ＝[1+k 1 ·(W 1 -10％)]×S 0 =0.162 m/s; the real-time air flow speed of the heat medium conveyed to the lump ore storage bin 1 is adjusted to be more than or equal to 0.162m/s, and the heat medium dries the lump ore in the lump ore storage bin 1, so that the water content of the lump ore before entering a blast furnace is lower than 4%.
Application example 4
The method of example 19 was used in a Zhanjiang iron and steel smelting plant, in which a first moisture detecting device 201 was provided at the lump ore feed port of the lump ore storage bin 1, and the initial air flow rate S of the heat medium fed to the lump ore storage bin 1 was set 0 Is 0.18m/s. The first moisture detecting device 201 detects the moisture content W in the lump ore entering the lump ore storage bin 1 1 7.7%. Setting the block entering the blast furnace according to the requirements of blast furnace conditionsUpper limit W of water content of ore max 4%. Judgment of W 1 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 1 ，m/s；
Since 10% > W 1 ＞6％，S 1 ＝S 0 The method comprises the steps of carrying out a first treatment on the surface of the The air flow speed of the heat medium is kept to be 0.18m/s, the heat medium carries out drying treatment on lump ore in the lump ore storage bin 1, and the water content of the lump ore before entering the blast furnace is ensured to be lower than 4 percent.
Application example 5
The method of example 19 was used in a Zhanjiang iron and steel smelting plant, in which a first moisture detecting device 201 was provided at the lump ore feed port of the lump ore storage bin 1, and the initial air flow rate S of the heat medium fed to the lump ore storage bin 1 was set 0 Is 0.4m/s. The first moisture detecting device 201 detects the moisture content W in the lump ore entering the lump ore storage bin 1 1 5.2%. Setting the upper limit W of the water content of lump ore entering the blast furnace according to the requirements of blast furnace conditions max 3%. Judgment of W 1 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 1 ，m/s；k 2 The value of (2) is 2.5;
due to 3% < W 1 ≤6％，S 1 ＝[1-k 2 ·(6％-W 1 )]×S 0 =0.392 m/s; the real-time air flow speed of the heat medium conveyed to the lump ore storage bin 1 is regulated to be 0.392m/s, and the heat medium dries the lump ore in the lump ore storage bin 1 so that the water content of the lump ore before entering a blast furnace is lower than 3%.
Application example 6
The method described in example 20 was used in a Zhanjiang iron and steel smelting plant, and a second moisture detecting device 202 was provided at the lump ore outlet of the lump ore storage bin 1, and the initial air flow rate of the heat medium fed to the lump ore storage bin 1 was set to 0.15m/s. The second moisture detecting device 202 detects the moisture content W in the discharged lump ore of the lump ore storage bin 1 2 6.7%. Setting the upper limit W of the water content of lump ore entering the blast furnace according to the requirements of blast furnace conditions max 4%. Judgment of W 2 And W is equal to max Is adjusted to be delivered to the lump ore storageReal-time air flow speed S of the thermal medium of the silo 1 2 ，m/s；k 3 The value of (2); the method comprises the following steps:
due to W 2 Not less than 4%, calculate S 2 ＝[1+k 3 ·(W 2 -W max )]×S 0 = 0.1581m/s; the real-time air flow speed of the heat medium conveyed to the lump ore storage bin 1 is regulated to 0.1581m/s, and the heat medium dries the lump ore in the lump ore storage bin 1 so that the water content of the lump ore entering the blast furnace is lower than 4%.
Application example 7
The method described in example 20 was used in a Zhanjiang iron and steel smelting plant, and a second moisture detecting device 202 was provided at the lump ore outlet of the lump ore storage bin 1, and the initial air flow rate of the heat medium fed to the lump ore storage bin 1 was set to 0.25m/s. The second moisture detecting device 202 detects the moisture content W in the discharged lump ore of the lump ore storage bin 1 2 3.3%. Setting the upper limit W of the water content of lump ore entering the blast furnace according to the requirements of blast furnace conditions max 4%. Judgment of W 2 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 2 M/s; the method comprises the following steps:
due to 2% < W 2 ＜4％，S 1 ＝S 0 The method comprises the steps of carrying out a first treatment on the surface of the The air flow speed of the heat medium is kept at 0.25m/s, the heat medium dries the lump ore in the lump ore storage bin 1, and the water content of the lump ore before entering the blast furnace is ensured to be lower than 4%.
Application example 8
The method described in example 20 was used in a Zhanjiang iron and steel smelting plant, and a second moisture detecting device 202 was provided at the lump ore outlet of the lump ore storage bin 1, and the initial air flow rate of the heat medium fed to the lump ore storage bin 1 was set to 0.4m/s. The second moisture detecting device 202 detects the moisture content W in the discharged lump ore of the lump ore storage bin 1 2 1.1%. Setting the upper limit W of the water content of lump ore entering the blast furnace according to the requirements of blast furnace conditions max 4%. Judgment of W 2 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin 1 2 ，m/s；k 4 The value of (2) is 1.5; it is specificallyThe method comprises the following steps:
due to W 2 ≤2％，S 2 ＝[1-k 4 ·(0.5W max -W 2 )]×S 0 = 0.3946m/s; the real-time air flow speed of the heat medium conveyed to the lump ore storage bin 1 is regulated to 0.3946m/s, and the heat medium dries the lump ore in the lump ore storage bin 1 so that the water content of the lump ore entering the blast furnace is lower than 4%.
By adopting the lump ore pretreatment method provided by the invention, the dried lump ore obtained after pretreatment is conveyed to a blast furnace, and the addition amount of the lump ore can be increased to 30% -35% in the raw materials added to the blast furnace, so that the smelting cost of the blast furnace can be reduced by about 12 yuan per ton of molten iron in unit time; 2500m 3 Is a kind of blast furnace with a annual cost saving of 2160 ten thousand yuan.
In addition, the iron content in the lump ore is higher than that of the sintered ore and the pellet ore, the pretreated addition amount of the lump ore is increased in a blast furnace, and the yield of the obtained molten iron can be increased by 10-30% through a blast furnace smelting process.
Claims (35)
1. The utility model provides a storage silo lump ore pretreatment system which characterized in that: the system comprises a lump ore storage bin (1), a spiral blanking device (5) and a heat medium conveying pipeline (L1); the spiral blanking device (5) is arranged in the lump ore storage bin (1); a lump ore feed inlet (101), a lump ore discharge outlet (102), a heat medium inlet (103) and a heat medium outlet (104) are arranged on the lump ore storage bin (1); a heat medium delivery pipe (L1) is connected to the heat medium inlet (103);
the spiral feeder (5) is of a double-layer spiral surface structure; the spiral blanking device (5) comprises 2 layers of spiral blanking plates (507); a coarse material channel (501) from top to bottom is formed between the spiral blanking plate (50701) at the upper layer and the inner wall of the lump ore storage bin (1); a fine material channel (502) from top to bottom is formed between the upper spiral blanking plate (50701) and the lower spiral blanking plate (50702); the spiral blanking plate (50701) at the upper layer is provided with a sieve hole (503); the fine material channel (502) is positioned below the coarse material channel (501); the sieve holes (503) are communicated with the coarse material channel (501) and the fine material channel (502); the lump ore feeding port (101) and the heat medium outlet (104) are both positioned at the upper part of the lump ore storage bin (1), and the lump ore discharging port (102) and the heat medium inlet (103) are both positioned at the lower part of the lump ore storage bin (1); wherein, the lump ore feeding port (101) and the heat medium outlet (104) are communicated with the top end of the coarse material channel (501), and the lump ore discharging port (102) and the heat medium inlet (103) are communicated with the bottom end of the coarse material channel (501); a heat medium delivery pipe (L1) is connected to the heat medium inlet (103); the heat medium enters from a heat medium inlet (103) positioned at the lower part of the lump ore storage bin (1), then passes through a coarse material channel (501) upwards and is discharged from a heat medium outlet (104) positioned at the upper part of the lump ore storage bin (1).
2. The system according to claim 1, wherein: the system also comprises a heat supplementing inlet (107), wherein the heat supplementing inlet (107) is arranged on the side wall of the lump ore storage bin (1) and is communicated with the coarse material channel (501); and/or
The system further includes a supplemental heat shaft tube (108); the heat supplementing shaft tube (108) is of a tubular structure with an opening at the bottom end and is positioned on the central axis of the spiral feeder (5) in the vertical direction; the bottom end opening of the heat supplementing shaft tube (108) is communicated with the heat medium inlet (103); and a through hole (109) is formed in the pipe wall of the heat supplementing shaft pipe (108) positioned in the coarse material channel (501).
3. The system according to claim 2, wherein: the number of the heat supplementing inlets is 1-20; all of the heat compensating inlets (107) are communicated with the coarse material channel (501).
4. A system according to claim 3, characterized in that: the number of the heat supplementing inlets is 3-15.
5. The system according to claim 1, wherein: the top of the lump ore storage bin (1) is provided with a material distribution chamber (105), and the lower part of the lump ore storage bin (1) is provided with a material collection chamber (106); the spiral feeder (5) is positioned between the material distribution chamber (105) and the material collection chamber (106); the lump ore feeding hole (101) is arranged on the material distribution chamber (105), and the lump ore discharging hole (102) is arranged on the material collection chamber (106); wherein: lump ore enters the material distribution chamber (105) from the lump ore feed inlet (101), then passes through the coarse material channel (501) and enters the material collection chamber (106); the heat medium inlet (103) is arranged on the material collecting chamber (106), and the heat medium outlet (104) is arranged on the material distributing chamber (105); the heat medium enters the lump ore storage bin (1) from the heat medium inlet (103) on the material collecting chamber (106), is directly contacted with the lump ore for heat exchange, and then upwards passes through the coarse material channel (501) and is discharged from the heat medium outlet (104) on the material distributing chamber (105).
6. The system according to claim 5, wherein: the spiral blanking device (5) further comprises a blanking feed inlet (504), a coarse material discharge outlet (505) and a fine material discharge outlet (506); the blanking feed inlet (504) is arranged at the top end of the coarse material channel (501) and is communicated with the material distribution chamber (105) and the coarse material channel (501); the coarse material discharging port (505) is arranged at the bottom end of the coarse material channel (501) and is communicated with the coarse material channel (501) and the material collecting chamber (106); the fine material discharging hole (506) is arranged on the side wall of the lump ore storage bin (1) and is communicated with the fine material channel (502) and the outside.
7. The system according to any one of claims 1-5, wherein: a first moisture detection device (201), a first material flow detection device (301) and a first material temperature detection device (401) are arranged at a lump ore feeding port (101) on a lump ore storage bin (1); and/or
A second moisture detection device (202) is arranged at the lump ore discharging hole (102) of the lump ore storage bin (1).
8. The system according to any one of claims 1-5, wherein: the system comprises a plurality of spiral feeders (5); the spiral feeders (5) are arranged in the lump ore storage bin (1); the discharging feed inlets (504) of all the spiral discharging devices (5) are communicated with the material distribution chamber (105); the coarse material outlet (505) of all the spiral feeders (5) are communicated with the material collecting chamber (106); all the fine material discharging holes (506) of the spiral blanking device (5) are communicated with the outside.
9. The system according to claim 8, wherein: the number of the spiral feeders (5) is 1-30.
10. The system according to claim 9, wherein: the number of the spiral feeders (5) is 3-20.
11. The system according to claim 10, wherein: the number of the spiral feeders (5) is 5-15.
12. The system according to any one of claims 5-6, wherein: the system further comprises a heat medium guiding device (7); the heat medium flow guiding device (7) is arranged in the material collecting chamber (106), and a heat medium flow guiding inlet (701) and a heat medium flow guiding outlet (702) are arranged on the heat medium flow guiding device (7); the heat medium inlet (103) is in communication with the heat medium diversion inlet (701).
13. The system according to claim 12, wherein: 1-20 heat medium flow guiding devices (7) are arranged in the material collecting chamber (106); all the heat medium diversion inlets (701) of the heat medium diversion device (7) are communicated with the heat medium inlet (103); and/or
The system also comprises a dust removal system (8), wherein the heat medium outlet (104) is communicated with the dust removal system (8) through a heat medium discharge pipeline (L2); and/or
The system also comprises a blast furnace (6), and the lump ore discharging port (102) is connected to a feeding port of the blast furnace (6) through a lump ore conveying device (L3).
14. The system according to claim 13, wherein: 2-5 heat medium flow guiding devices (7) are arranged in the material collecting chamber (106).
15. The utility model provides a storage silo lump ore pretreatment system which characterized in that: the system comprises a lump ore storage bin (1), a spiral blanking device (5) and a heat medium conveying pipeline (L1); the spiral blanking device (5) is arranged in the lump ore storage bin (1); a lump ore feed inlet (101), a lump ore discharge outlet (102), a heat medium inlet (103) and a heat medium outlet (104) are arranged on the lump ore storage bin (1); a heat medium delivery pipe (L1) is connected to the heat medium inlet (103);
the spiral feeder (5) is of a double-layer spiral surface structure; the spiral blanking device (5) comprises 2 layers of spiral blanking plates (507); a coarse material channel (501) from top to bottom is formed between the spiral blanking plate (50701) at the upper layer and the inner wall of the lump ore storage bin (1); a fine material channel (502) from top to bottom is formed between the upper spiral blanking plate (50701) and the lower spiral blanking plate (50702); the spiral blanking plate (50701) at the upper layer is provided with a sieve hole (503); the fine material channel (502) is positioned below the coarse material channel (501); the sieve holes (503) are communicated with the coarse material channel (501) and the fine material channel (502); the lump ore feeding port (101) and the heat medium outlet (104) are both positioned at the upper part of the lump ore storage bin (1); the lump ore discharging hole (102) and the heat medium inlet (103) are both positioned at the lower part of the lump ore storage bin (1); wherein, the lump ore feeding port (101) is communicated with the top end of the coarse material channel (501), the heat medium outlet (104) is communicated with the exhaust port of the fine material channel (502), and the lump ore discharging port (102) and the heat medium inlet (103) are both communicated with the bottom end of the coarse material channel (501); a heat medium delivery pipe (L1) is connected to the heat medium inlet (103); the heat medium enters from the heat medium inlet (103) positioned at the lower part of the lump ore storage bin (1), then passes through the coarse material channel (501) and the fine material channel (502) upwards and is discharged from the heat medium outlet (104) communicated with the fine material channel (502).
16. The system according to claim 15, wherein: the system also comprises a heat supplementing inlet (107), wherein the heat supplementing inlet (107) is arranged on the side wall of the lump ore storage bin (1) and is communicated with the coarse material channel (501); and/or
The system further includes a supplemental heat shaft tube (108); the heat supplementing shaft tube (108) is of a tubular structure with an opening at the bottom end and is positioned on the central axis of the spiral feeder (5) in the vertical direction; the bottom end opening of the heat supplementing shaft tube (108) is communicated with the heat medium inlet (103); and a through hole (109) is formed in the pipe wall of the heat supplementing shaft pipe (108) positioned in the coarse material channel (501).
17. The system according to claim 16, wherein: the number of the heat supplementing inlets is 1-20; all of the heat compensating inlets (107) are communicated with the coarse material channel (501).
18. The system according to claim 17, wherein: the number of the heat supplementing inlets is 3-15.
19. The system according to claim 15, wherein: the top of the lump ore storage bin (1) is provided with a material distribution chamber (105), and the lower part of the lump ore storage bin (1) is provided with a material collection chamber (106); the spiral feeder (5) is positioned between the material distribution chamber (105) and the material collection chamber (106); the lump ore feeding hole (101) is arranged on the material distribution chamber (105), and the lump ore discharging hole (102) is arranged on the material collection chamber (106); wherein: lump ore enters the material distribution chamber (105) from the lump ore feed inlet (101), then passes through the coarse material channel (501) and enters the material collection chamber (106); the heat medium inlet (103) is arranged on the material collecting chamber (106), and the heat medium outlet (104) is arranged on the side wall of the lump ore storage bin (1) and is communicated with the fine material channel (502);
The heat medium enters the lump ore storage bin (1) from a heat medium inlet (103) on the material collecting chamber (106), is directly contacted with the lump ore for heat exchange, upwards passes through the coarse material channel (501) and the fine material channel (502), and is discharged from a heat medium outlet (104) on the side wall of the lump ore storage bin (1).
20. The system according to claim 19, wherein: the spiral blanking device (5) further comprises a blanking feed inlet (504), a coarse material discharge outlet (505) and a fine material discharge outlet (506); the blanking feed inlet (504) is arranged at the top end of the coarse material channel (501) and is communicated with the material distribution chamber (105) and the coarse material channel (501); the coarse material discharging port (505) is arranged at the bottom end of the coarse material channel (501) and is communicated with the coarse material channel (501) and the material collecting chamber (106); the fine material discharging hole (506) is arranged on the side wall of the lump ore storage bin (1) and is communicated with the fine material channel (502) and the outside.
21. The system according to any one of claims 15-20, wherein: a first moisture detection device (201), a first material flow detection device (301) and a first material temperature detection device (401) are arranged at a lump ore feeding port (101) on a lump ore storage bin (1); and/or
A second moisture detection device (202) is arranged at the lump ore discharging hole (102) of the lump ore storage bin (1).
22. The system according to any one of claims 15-20, wherein: the system comprises a plurality of spiral feeders (5); the spiral feeders (5) are arranged in the lump ore storage bin (1); the discharging feed inlets (504) of all the spiral discharging devices (5) are communicated with the material distribution chamber (105); the coarse material outlet (505) of all the spiral feeders (5) are communicated with the material collecting chamber (106); all the fine material discharging holes (506) of the spiral blanking device (5) are communicated with the outside.
23. The system according to claim 22, wherein: the number of the spiral feeders (5) is 1-30.
24. The system according to claim 23, wherein: the number of the spiral feeders (5) is 3-20.
25. The system according to claim 24, wherein: the number of the spiral feeders (5) is 5-15.
26. The system according to claim 19 or 20, characterized in that: the system further comprises a heat medium guiding device (7); the heat medium flow guiding device (7) is arranged in the material collecting chamber (106), and a heat medium flow guiding inlet (701) and a heat medium flow guiding outlet (702) are arranged on the heat medium flow guiding device (7); the heat medium inlet (103) is in communication with the heat medium diversion inlet (701).
27. The system according to claim 26, wherein: 1-20 heat medium flow guiding devices (7) are arranged in the material collecting chamber (106); all the heat medium diversion inlets (701) of the heat medium diversion device (7) are communicated with the heat medium inlet (103); and/or
The system also comprises a dust removal system (8), wherein the heat medium outlet (104) is communicated with the dust removal system (8) through a heat medium discharge pipeline (L2); and/or
The system also comprises a blast furnace (6), and the lump ore discharging port (102) is connected to a feeding port of the blast furnace (6) through a lump ore conveying device (L3).
28. The system according to claim 27, wherein: 2-5 heat medium flow guiding devices (7) are arranged in the material collecting chamber (106).
29. A method of lump ore pretreatment using the system of any one of claims 1-28, wherein: the method comprises the following steps:
1) Conveying the lump ore to be treated to a preheated lump ore storage bin (1), and continuously introducing a heat medium into the lump ore storage bin (1);
2) Drying and screening the lump ore to be treated in a lump ore storage bin (1) to obtain large-particle dry lump ore;
3) Before the lump ore to be treated is conveyed to the lump ore storage bin (1), the lump ore storage bin (1) is subjected to baking treatment by adopting a thermal medium, and the thermal medium preheats the lump ore storage bin (1); and/or
4) After heat exchange is carried out between the heat medium and lump ore in the lump ore storage bin (1), the heat medium is discharged from the lump ore storage bin (1), and the discharged heat medium is conveyed to a dust removal system; and/or
5) And conveying the large-particle dry lump ore obtained after the drying and screening treatment to a blast furnace.
30. The method according to claim 29, wherein: a first moisture detection device (201), a first material flow detection device (301) and a first material temperature detection device (401) are arranged at a lump ore feed inlet (101) of a lump ore storage bin (1); the first moisture detection device (201) detects the moisture content in the lump ore entering the lump ore storage bin (1) and is marked as W 0 ，％The method comprises the steps of carrying out a first treatment on the surface of the The first material flow detection device (301) detects the lump ore quantity entering the lump ore storage bin (1) in unit time and is recorded as M 0 ，m 3 The method comprises the steps of carrying out a first treatment on the surface of the The first material temperature detection device (401) detects the lump ore temperature entering the lump ore storage bin (1) and is marked as T 0 C, controlling the temperature; setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%) of the following; calculating the flow V, m of the heat medium which is conveyed to the lump ore storage bin (1) in unit time 3 ；
Wherein: c (C) Article (B) Specific heat capacity of lump ore, C Medium (C) Is the specific heat capacity of the thermal medium; ρ Article (B) To bulk density of lump ore ρ Medium (C) Is the density of the thermal medium; t is the temperature when the heat medium is input into the lump ore storage bin (1);
in unit time, conveying a heat medium with the flow not less than V to the lump ore storage bin (1), and drying the lump ore in the lump ore storage bin (1) by the heat medium so that the moisture content of the lump ore before entering a blast furnace is lower than W max ，％。
31. The method according to claim 29, wherein: a first moisture detection device (201) is arranged at a lump ore feed inlet (101) of the lump ore storage bin (1), and the initial airflow speed of the heat medium conveyed to the lump ore storage bin (1) is set to be S 0 M/s; the first moisture detection device (201) detects the moisture content in the lump ore entering the lump ore storage bin (1) and is marked as W 1 (in%) of the following; setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%) of the following; judgment of W 1 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin (1) 1 M/s; the method comprises the following steps:
when W is 1 ≤W max When the feeding of the heat medium into the lump ore storage bin (1) is stopped;
when W is 1 When more than or equal to 10 percent, S 1 ＝[1+k 1 ·(W 1 -10％)]×S 0 ；
When 10% > W 1 At > 6%, S 1 ＝S 0 ；
When W is max ＜W 1 S is less than or equal to 6 percent 1 ＝[1-k 2 ·(6％-W 1 )]×S 0 ；
Wherein k is 1 、k 2 For adjusting the coefficient, k of the air flow 1 The value range of (2) is 3-5, k 2 The value range of (2) is 1-3; w (W) max Less than or equal to 4 percent; real-time detection of W 1 The real-time airflow speed of the heat medium conveyed to the lump ore storage bin (1) is adjusted to be S 1 Drying the lump ore in the lump ore storage bin (1) by a heat medium so that the moisture content of the lump ore before entering a blast furnace is lower than W max ，％。
32. The method according to claim 29, wherein: a second moisture detection device (202) is arranged at a lump ore discharging hole (102) of the lump ore storage bin (1), and the initial air flow speed S of the heat medium conveyed to the lump ore storage bin (1) is set 0 M/s; the second moisture detection device (202) detects the moisture content in the discharged lump ore of the lump ore storage bin (1) and is marked as W 2 The method comprises the steps of carrying out a first treatment on the surface of the Setting the upper limit of the moisture content of lump ore entering the blast furnace as W according to the requirements of blast furnace conditions max (in%) of the following; judgment of W 2 And W is equal to max Adjusting the real-time air flow speed S of the heat medium conveyed to the lump ore storage bin (1) 2 M/s; the method comprises the following steps:
when W is 2 ≥W max At the time S 2 ＝[1+k 3 ·(W 2 -W max )]×S 0 ；
When 0.5W max ＜W 2 ＜W max At the time S 2 ＝S 0 ；
When W is 2 ≤0.5W max At the time S 2 ＝[1-k 4 ·(0.5W max -W 2 )]×S 0 ；
Wherein k is 3 、k 4 For adjusting the coefficient, k of the air flow 3 The value of (2) is 1-3, k 4 The value range of (2) is 0.5-2; w (W) max Less than 6%; real-time detection of W 2 Is larger than (1)The real-time air flow speed of the heat medium conveyed to the lump ore storage bin (1) is adjusted to be S 2 Drying the lump ore in the lump ore storage bin (1) by a heat medium so that the moisture content of the lump ore before entering a blast furnace is lower than W max ，％。
33. The method according to claim 29, wherein: the heat medium is a heat source generated by the steel process; and/or
The temperature of the heat medium entering the lump ore storage bin (1) is higher than 100 ℃;
the air flow speed of the heat medium entering the lump ore storage bin (1) is 0.01-3 m/s; and/or
The retention time of the lump ore in the lump ore storage bin (1) is 0.5-24 h; and/or
The particle size of the large-particle lump ore is larger than 5mm.
34. The method according to claim 33, wherein: the heat medium is a heat source released by burning the hot exhaust gas of the sintering circular cooler, the exhaust gas of the blast furnace hot blast stove, the coke oven gas/the blast furnace gas/the converter gas; and/or
The temperature of the heat medium entering the lump ore storage bin (1) is more than 150 ℃;
the air flow speed of the heat medium entering the lump ore storage bin (1) is 0.03-2 m/s; and/or
The retention time of lump ore in the lump ore storage bin (1) is 1-12 h; and/or
The particle size of the large-particle lump ore is larger than 6mm.
35. The method as claimed in claim 34, wherein: the heat medium is sintering circular cooler hot exhaust gas and blast furnace hot blast stove exhaust gas; and/or
The airflow speed of the heat medium entering the lump ore storage bin (1) is 0.05-1 m/s; and/or
The retention time of lump ore in the lump ore storage bin (1) is 2-8 h; and/or
The particle size of the large-particle lump ore is larger than 8mm.
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