CN110983037B - Device for drying mineral powder raw material by utilizing pellet waste heat - Google Patents
Device for drying mineral powder raw material by utilizing pellet waste heat Download PDFInfo
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- CN110983037B CN110983037B CN201911325676.7A CN201911325676A CN110983037B CN 110983037 B CN110983037 B CN 110983037B CN 201911325676 A CN201911325676 A CN 201911325676A CN 110983037 B CN110983037 B CN 110983037B
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- rotary drum
- pellet
- drying
- mineral powder
- powder
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- 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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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- 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
- C22B1/24—Binding; Briquetting ; Granulating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a device for drying a mineral powder raw material by utilizing pellet waste heat, and relates to a waste heat recycling technology. The invention solves the technical problem of providing a device which utilizes the waste heat after cooling pellets to dry mineral powder raw materials and does not pollute the mineral powder raw materials, and the adopted technical scheme is as follows: the device for drying the mineral powder raw material by utilizing pellet waste heat comprises a fan, a pellet cooling rotary drum, a powder drying rotary drum and a dust remover, wherein a pellet feeding port and a pellet discharging port are respectively arranged at two ends of the pellet cooling rotary drum, and the fan is connected with one end provided with the pellet discharging port; the two ends of the powder drying rotary drum are respectively provided with a mineral powder feeding hole and a mineral powder discharging hole, and are respectively connected with the dust remover and the powder drying rotary drum. The pellets with waste heat enter a pellet cooling rotary drum, a fan sends heat emitted by the pellets into a powder drying rotary drum, hot air flows are in contact with wet mineral powder raw materials to take away moisture in the wet mineral powder raw materials, and waste gas is purified by a dust remover and then is discharged into the atmosphere.
Description
Technical Field
The invention relates to a waste heat recycling technology, in particular to a device for drying a mineral powder raw material by utilizing pellet waste heat.
Background
The pellets produced in the pellet mill are cooled by a three-stage circular cooler and then are about 120 ℃. In the prior art, the pellets are directly conveyed to a blast furnace for smelting through a belt conveyor or conveyed to a finished product warehouse for natural cooling, and the waste heat of the pellets conveyed to the finished product warehouse is wasted.
The raw material iron ore concentrate for producing the pellets needs to be dried, and according to the prior art, the iron ore concentrate is dried by adopting a rotary kiln generally. The rotary drum of the rotary kiln is slightly inclined and rotates at a certain rotating speed, hot air generated by fossil fuels such as coal, natural gas, coal gas, heavy oil and the like is introduced into the rotary drum of the rotary kiln, wet materials enter from the upper end of the rotary kiln, dry materials flow out from the lower end of the rotary kiln, and then the wet materials enter the next procedure. The main disadvantages of the above process for drying iron ore concentrate are high energy consumption, high cost and pollution of flue gas and tail gas to the atmosphere. The purification of the flue gas requires denitration, desulfurization and whitening, which not only increases the investment, but also increases the operation cost. Meanwhile, high-temperature flue gas generated by combustion can cause partial mineral powder to be oxidized, and the quality of finished products is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device which utilizes the waste heat after the cooling of the pellets to dry the mineral powder raw materials and does not pollute the mineral powder raw materials.
The technical scheme adopted by the invention for solving the technical problems is as follows: the device for drying the mineral powder raw material by utilizing pellet waste heat comprises a fan, a pellet cooling rotary drum, a powder drying rotary drum and a dust remover, wherein one end of the pellet cooling rotary drum is provided with a pellet feeding hole, the other end of the pellet cooling rotary drum is provided with a pellet discharging hole, and an air outlet of the fan is connected with one end of the pellet cooling rotary drum, which is close to the pellet discharging hole;
one end of the powder drying rotary drum is provided with a mineral powder feeding hole, the other end of the powder drying rotary drum is provided with a mineral powder discharging hole, one end of the powder drying rotary drum close to the mineral powder feeding hole is connected with a dust remover, and one end of the powder drying rotary drum close to the mineral powder discharging hole is connected with one end of the pellet cooling rotary drum close to the pellet feeding hole; the pellet cooling rotary drum and the powder drying rotary drum are respectively provided with a power device for driving the pellet cooling rotary drum and the powder drying rotary drum to rotate, and discharge spirals are arranged in the pellet cooling rotary drum and the powder drying rotary drum.
Further, the method comprises the following steps: the pellet cooling rotary drum is obliquely arranged, the mounting height of the pellet feeding port is greater than that of the pellet discharging port, and the axis of the pellet cooling rotary drum and the axis of the powder drying rotary drum are positioned on the same straight line. Specifically, the method comprises the following steps: the inclination angle of the pellet cooling rotary drum and the powder drying rotary drum is 3-5 degrees.
Further, the method comprises the following steps: the insides of the pellet cooling rotary drum and the powder drying rotary drum are respectively provided with a material turning and shoveling plate.
Specifically, the method comprises the following steps: and one end of the pellet cooling rotary drum, which is close to the pellet feed inlet, is provided with a reticular clapboard.
Specifically, the method comprises the following steps: the power device is a variable frequency motor, the outer sides of the pellet cooling rotary drum and the powder drying rotary drum are respectively provided with a driving gear ring, and each driving gear ring is respectively matched with the variable frequency motor.
Further, the method comprises the following steps: the bottom of pelletizing cooling rotary drum and powder stoving rotary drum sets up the supporting seat respectively, and the supporting seat includes concrete buttress and installs in the support ring at concrete buttress top, and pelletizing cooling rotary drum and powder stoving rotary drum place respectively in the support ring.
The invention has the beneficial effects that: the pellets pass through the pellet cooling rotary drum, the air blower is used for air cooling the pellets, the obtained hot air is blown into the powder drying rotary drum, and then the mineral powder raw material is dried, so that the purpose of energy conservation is achieved. Because the medium for drying the mineral powder raw materials is hot air instead of flue gas generated by burning fuel, the dried mineral powder raw materials are not polluted, and the pollution caused by burning fossil fuel is reduced. One end of the powder drying rotary drum, which is close to the mineral powder feeding hole, is connected with a dust remover, and dust and the like generated in the mineral powder raw material drying process are purified by the dust remover and then discharged into the atmosphere, so that the purpose of environmental protection is achieved.
The pellet cooling rotary drum and the powder drying rotary drum are arranged in an inclined way, so that the material mineral powder raw material can be uniformly fluidized, and can better conduct heat and mass transfer with air blown by a fan, and the full heat exchange between the pellets and the mineral powder raw material is facilitated. The end of the pellet cooling rotary drum close to the pellet feed inlet is provided with a reticular clapboard which separates the pellet cooling rotary drum and the powder drying rotary drum.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the apparatus for drying ore powder raw material by pellet waste heat according to the present invention.
Parts, positions and numbers in the drawings: the device comprises a fan 1, a pellet cooling rotary drum 2, a pellet feeding port 21, a pellet discharging port 22, a mesh partition plate 23, a powder drying rotary drum 3, a mineral powder feeding port 31, a mineral powder discharging port 32, a dust remover 4, a variable frequency motor 5, a driving toothed ring 6, a concrete buttress 7 and a support ring 8.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in figure 1, the invention comprises a device for drying mineral powder raw materials by using pellet waste heat, which comprises a fan 1, a pellet cooling rotary drum 2, a powder drying rotary drum 3 and a dust remover 4, wherein one end of the pellet cooling rotary drum 2 is provided with a pellet feeding hole 21, and the other end is provided with a pellet discharging hole 22. In fig. 1, a pellet feed port 21 is formed at the right end of the pellet cooling drum 2, and the pellet feed port 21 is in a hopper shape and is used for feeding pellets into the pellet cooling drum 2; the left end of the pellet cooling drum 2 is provided with a pellet discharge port 22, and the pellet discharge port 22 is arranged downwards and used for discharging cooled pellets. Fan 1 is used for blowing air in 2 to pelletizing cooling rotary drum, and the air outlet of fan 1 links to each other with pelletizing cooling rotary drum 2 near the one end of pelletizing discharge gate 22, and the air outlet of fan 1, also be the air intake of pelletizing cooling rotary drum 2, best vertical setting downwards avoids the dust to get into fan 1.
One end of the powder drying rotary drum 3 is provided with a mineral powder inlet 31, and the other end is provided with a mineral powder outlet 32. In fig. 1, a mineral powder feed port 31 is arranged at the right end of the powder drying rotary drum 3, and the mineral powder feed port 31 is in a hopper shape; the left end of the powder drying rotary drum 3 is provided with a mineral powder discharge port 32, and the mineral powder discharge port 32 is an outlet of dried mineral powder raw materials. One end of the powder drying rotary drum 3 close to the mineral powder feeding hole 31 is connected with the dust remover 4, and one end of the powder drying rotary drum 3 close to the mineral powder discharging hole 32 is connected with one end of the pellet cooling rotary drum 2 close to the pellet feeding hole 21. The movement direction of the mineral powder raw material in the powder drying rotary drum 3 is opposite to the air flow direction, and the drying of the mineral powder raw material is realized by hot air blown from the pellet cooling rotary drum 2. The dust collector 4 is used for filtering the airflow blown out of the powder drying drum 3, for example, the dust collector 4 is a bag-type dust collector.
The pellet cooling rotary drum 2 and the powder drying rotary drum 3 are respectively provided with a power device for driving the pellet cooling rotary drum 2 and the powder drying rotary drum 3 to rotate, discharging spirals are arranged in the pellet cooling rotary drum 2 and the powder drying rotary drum 3, and conveying of the pellet and the mineral powder raw materials is realized through the discharging spirals in the pellet cooling rotary drum 2 and the powder drying rotary drum 3. For example, the power device is a motor, and preferably a variable frequency motor 5, and an output shaft of the variable frequency motor 5 is provided with a gear; meanwhile, driving toothed rings 6 are respectively arranged on the outer sides of the pellet cooling rotary drum 2 and the powder drying rotary drum 3, and the driving toothed rings 6 are respectively meshed with gears of the variable frequency motor 5.
The bottoms of the pellet cooling rotary drum 2 and the powder drying rotary drum 3 are respectively provided with a supporting seat, and the driving gear ring 6 also has the function of supporting the pellet cooling rotary drum 2 and the powder drying rotary drum 3, so that the pellet cooling rotary drum 2 and the powder drying rotary drum 3 can be respectively provided with one supporting seat. For example, as shown in fig. 1, the support base comprises a concrete pier 7 and a support ring 8 mounted on the top of the concrete pier 7, and the pellet cooling drum 2 and the powder drying drum 3 are respectively placed in the support ring 8. The support ring 8 is rotatably matched with the pellet cooling rotary drum 2 and the powder drying rotary drum 3, namely, the support ring 8 does not influence the rotation of the pellet cooling rotary drum 2 and the powder drying rotary drum 3.
The axial line of the pellet cooling rotary drum 2 and the axial line of the powder drying rotary drum 3 are positioned on the same straight line. The pellet cooling drum 2 and the powder drying drum 3 are preferably arranged obliquely, and the mounting height of the pellet feeding port 21 is larger than that of the pellet discharging port 22, as shown in fig. 1. For example, the inclination angles of the pellet cooling drum 2 and the powder drying drum 3 are 3-5 °.
The belt feeder sends the pellet with the temperature of about 120 degrees to the pellet feed inlet 21, the pellet falls into the pellet cooling drum 2 under the action of self weight, the inner wall of the pellet cooling drum 2 is provided with the material turning shoveling plates with different angles, the material turning shoveling plates rotate along with the pellet cooling drum 2 and ceaselessly turn the pellet, the material on the lower portion is turned to the upper side and the top and then falls freely, and the pellet and the air blown by the fan 1 fully perform heat exchange. Correspondingly, the wet mineral powder raw material is conveyed to the mineral powder feeding hole 31 by the belt feeder and falls into the powder drying rotary drum 3 by gravity, the inner wall of the powder drying rotary drum 3 is provided with turning shoveling plates with different angles, the turning shoveling plates rotate along with the powder drying rotary drum 3 and ceaselessly turn over the wet mineral powder raw material, so that the material at the lower part is turned to the upper side part and the top part and then falls freely, and the wet mineral powder raw material is in full contact with hot air.
In order to prevent the pellets from entering the powder drying drum 3, a mesh-shaped partition plate 23 is arranged at one end of the pellet cooling drum 2 close to the pellet feed inlet 21. Correspondingly, the two ends of the powder drying rotary drum 3 can be respectively provided with a filter screen, so that the mineral powder raw material is prevented from entering the powder drying rotary drum 3. Because the direction of the airflow in the powder drying rotary drum 3 is opposite to the conveying direction of the mineral powder raw material, but the movement of the mineral powder raw material is mainly determined by the discharging spiral in the powder drying rotary drum 3, most of the dried mineral powder raw material is discharged from the mineral powder discharging port 32, and the working load of the dust remover 4 is not overlarge.
The device for drying the mineral powder raw material by utilizing the pellet waste heat introduces the pellets with waste heat from the third section of the three-section type circular cooler into the pellet cooling rotary drum 2 through the belt conveyer, utilizes the fan 1 to send the heat emitted by the pellets into the powder drying rotary drum 3, and contacts with the wet mineral powder raw material through hot air flow, thereby taking away the moisture in the wet mineral powder raw material, and the waste gas is purified by the bag-type dust collector and then is discharged into the atmosphere.
Claims (8)
1. Utilize device of pellet waste heat stoving powdered ore raw materials, its characterized in that: the pellet drying device comprises a fan (1), a pellet cooling rotary drum (2), a powder drying rotary drum (3) and a dust remover (4), wherein one end of the pellet cooling rotary drum (2) is provided with a pellet feeding hole (21), the other end of the pellet cooling rotary drum is provided with a pellet discharging hole (22), and an air outlet of the fan (1) is connected with one end, close to the pellet discharging hole (22), of the pellet cooling rotary drum (2);
one end of the powder drying rotary drum (3) is provided with a mineral powder feeding hole (31), the other end of the powder drying rotary drum is provided with a mineral powder discharging hole (32), one end of the powder drying rotary drum (3) close to the mineral powder feeding hole (31) is connected with the dust remover (4), and one end of the powder drying rotary drum (3) close to the mineral powder discharging hole (32) is connected with one end of the pellet cooling rotary drum (2) close to the pellet feeding hole (21); the pellet cooling rotary drum (2) and the powder drying rotary drum (3) are respectively provided with a power device for driving the pellet cooling rotary drum and the powder drying rotary drum to rotate, and discharge spirals are arranged in the pellet cooling rotary drum (2) and the powder drying rotary drum (3).
2. The device for drying the mineral powder raw material by using pellet waste heat as claimed in claim 1, wherein: the pellet cooling rotary drum (2) is obliquely arranged, the mounting height of the pellet feeding port (21) is greater than that of the pellet discharging port (22), and the axis of the pellet cooling rotary drum (2) and the axis of the powder drying rotary drum (3) are positioned on the same straight line.
3. The device for drying the mineral powder raw material by using pellet waste heat as claimed in claim 2, wherein: the inclination angles of the pellet cooling rotary drum (2) and the powder drying rotary drum (3) are 3-5 degrees.
4. The device for drying the mineral powder raw material by using pellet waste heat as claimed in claim 1, wherein: the pellet cooling rotary drum (2) and the powder drying rotary drum (3) are respectively internally provided with a material turning and shoveling plate.
5. The device for drying the mineral powder raw material by using the pellet waste heat as claimed in any one of claims 1 to 4, wherein: one end of the pellet cooling rotary drum (2) close to the pellet feed inlet (21) is provided with a reticular clapboard (23).
6. The device for drying the mineral powder raw material by using the pellet waste heat as claimed in any one of claims 1 to 4, wherein: the dust remover (4) is a bag-type dust remover.
7. The device for drying the mineral powder raw material by using the pellet waste heat as claimed in any one of claims 1 to 4, wherein: the power device is a variable frequency motor (5), the outer sides of the pellet cooling rotary drum (2) and the powder drying rotary drum (3) are respectively provided with a driving gear ring (6), and each driving gear ring (6) is respectively matched with the variable frequency motor (5).
8. The device for drying the mineral powder raw material by using the pellet waste heat as claimed in any one of claims 1 to 4, wherein: the bottom of pelletizing cooling rotary drum (2) and powder stoving rotary drum (3) sets up the supporting seat respectively, and the supporting seat includes concrete buttress (7) and installs in support ring (8) at concrete buttress (7) top, and pelletizing cooling rotary drum (2) and powder stoving rotary drum (3) are placed respectively in support ring (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325676.7A CN110983037B (en) | 2019-12-20 | 2019-12-20 | Device for drying mineral powder raw material by utilizing pellet waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325676.7A CN110983037B (en) | 2019-12-20 | 2019-12-20 | Device for drying mineral powder raw material by utilizing pellet waste heat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110983037A CN110983037A (en) | 2020-04-10 |
| CN110983037B true CN110983037B (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911325676.7A Active CN110983037B (en) | 2019-12-20 | 2019-12-20 | Device for drying mineral powder raw material by utilizing pellet waste heat |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202442599U (en) * | 2012-02-16 | 2012-09-19 | 焦作市迈科冶金机械有限公司 | Ore material preheater |
| CN203999746U (en) * | 2014-06-18 | 2014-12-10 | 中信重工机械股份有限公司 | Acid pellet production process waste heat recycling system |
| CN104913652B (en) * | 2015-05-20 | 2016-11-30 | 中南大学 | A kind of method of Shaft Furnace Pelletizing Process grog waste heat recovery and device thereof |
| CN108300851A (en) * | 2018-01-31 | 2018-07-20 | 山东墨龙石油机械股份有限公司 | A kind of HIsmelt iron-bearing materials preheating pre-reduction treatment technique |
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