CN114875193A - Novel cooling and screening device and method for direct reduced iron - Google Patents
Novel cooling and screening device and method for direct reduced iron Download PDFInfo
- Publication number
- CN114875193A CN114875193A CN202210185386.2A CN202210185386A CN114875193A CN 114875193 A CN114875193 A CN 114875193A CN 202210185386 A CN202210185386 A CN 202210185386A CN 114875193 A CN114875193 A CN 114875193A
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- temperature
- cooling
- cylinder
- measuring device
- temperature measuring
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Links
- 238000001816 cooling Methods 0.000 title claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000012216 screening Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005453 pelletization Methods 0.000 abstract 2
- 239000008188 pellet Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 10
- 229910052725 zinc Inorganic materials 0.000 description 10
- 239000011701 zinc Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- 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
- B07B1/18—Drum screens
- B07B1/22—Revolving drums
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a novel cooling and screening device and a cooling and screening method for direct reduced iron. The device comprises a cooling cylinder, a cylindrical screen, a screen downsize chute and a heat-resistant rubber belt conveyor which are sequentially arranged, wherein the cooling cylinder is connected with the cylindrical screen through bolts, controllable water amount adjustable spraying devices are arranged on the periphery of the cooling cylinder and the periphery of the cylindrical screen, and spray heads of the controllable water amount adjustable spraying devices are arranged at intervals in the length direction of a cylinder body and a screen body; a temperature measuring device is arranged at the tail of the cylinder screen; the temperature measuring device also comprises a control device, when the temperature at the temperature measuring device is lower than 60 ℃, the control device outputs a control signal to reduce the water yield of the controllable water yield adjustable spraying device until the temperature at the temperature measuring device 9 is 100 ℃; when the temperature of the temperature measuring device is higher than 200 ℃, the control device outputs a control signal to increase the water outlet quantity of the controllable water quantity adjustable spraying device and/or reduce the rotating speed of the cylinder. The device not only reaches the effect of cooling high temperature pelletizing, has reached the effect of pelletizing screening simultaneously.
Description
Technical Field
The invention relates to a cooling and screening device, in particular to a cooling and screening device for direct reduced iron of a rotary kiln, and belongs to the technical field of direct reduced iron.
Background
The blast furnace gas ash is solid waste obtained by carrying out dry dust removal on fine dust carried by blast furnace gas in a blast furnace ironmaking process, has complex chemical components and mainly contains elements such as iron, carbon, zinc and the like. The low-zinc blast furnace gas ash can be used as a raw material for sintering iron ores. However, as the zinc load increases, the service life of the blast furnace lining, the heat flow distribution of the blast furnace, the energy consumption of the blast furnace and the like are adversely affected. Meanwhile, the high-zinc gas ash contains heavy metals such as lead and zinc, and must be stored in a sealed manner, so that environmental protection pressure is brought to enterprises. About 20kg of gas ash is generated when 1t of steel is produced by the blast furnace, so that the generation amount of high-zinc gas ash in China exceeds 10 Mt/a. Therefore, the problem that the steel enterprises are in urgent need to solve at present is to find an economical and reasonable method for effectively recycling the gas ash.
At present, the direct reduction treatment of blast furnace gas ash by a rotary kiln is one of the main technologies. The process comprises the steps of uniformly mixing gas ash, coal powder or other carbon-containing substances and a binder to prepare carbon-containing pellets, drying the carbon-containing pellets, enabling the dried pellets to enter a rotary kiln, reducing the pellets into metallized pellets in a reduction area at 1000-1100 ℃ in the kiln, reducing zinc into metal zinc, volatilizing the metal zinc into flue gas, and recovering the zinc from the flue gas through subsequent treatment. After the reaction is finished, the general subsequent treatment flow of the high-temperature reduction pellets from the rotary kiln is to cool the pellets, grind and magnetically separate the cooled pellets to obtain fine iron powder, then briquetting the fine iron powder, and feeding the briquetted iron blocks into a blast furnace for iron making or an electric furnace for steel making. In actual operation, considering the complexity of the process and the economic problem, the high-temperature reduction pellets are usually cooled and then screened, the oversize bulk materials enter a blast furnace for iron making, and the undersize powder enters sintering.
In the prior art, a cylindrical cooler and direct water quenching are the two main cooling modes of direct reduced iron of a rotary kiln, but materials coming out of the cylindrical cooler are transported to be screened by an adhesive tape machine, so that the process is long; although the direct water quenching has good cooling effect, the water consumption is large, the operation environment is poor, and the water content of the cooled pellets is large, so that the subsequent screening treatment is not facilitated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel cooling and screening device and a novel cooling and screening method for direct reduced iron.
In order to solve the technical problem, the novel cooling and screening device for the direct reduced iron comprises a cooling cylinder, a cylindrical screen, a screen downspouting and a heat-resistant rubber belt conveyor which are sequentially arranged, wherein the cooling cylinder is connected with the cylindrical screen through a bolt, controlled water amount adjustable spraying devices are arranged on the periphery of the cooling cylinder and the periphery of the cylindrical screen, and spray heads of the controlled water amount adjustable spraying devices are arranged at intervals in the length direction of a cylinder body and a screen body; a temperature measuring device is arranged at the tail of the cylinder screen;
the temperature measuring device also comprises a control device, when the temperature at the temperature measuring device is lower than 60 ℃, the control device outputs a control signal to reduce and adjust the water yield of the adjustable spraying device with the controlled water yield until the temperature at the temperature measuring device 9 is 100 ℃; when the temperature of the temperature measuring device is higher than 200 ℃, the control device outputs a control signal to increase the water outlet quantity of the adjustable spraying device for adjusting the controlled water quantity and/or reduce the rotating speed of the cylinder.
Further, the chute below the cylindrical screen is a step-shaped chute.
Furthermore, the front section of the cooling cylinder is provided with a refractory material, and the rear section of the cooling cylinder is provided with a wear-resistant lining plate.
Furthermore, a heat-conducting plate is arranged in the cooling cylinder body. So that the material is cooled more uniformly.
In order to achieve the above object, the present invention provides a cooling and screening method for an apparatus, comprising: monitoring the temperature of the screen tail of the cylinder in real time, and when the temperature of the temperature measuring device is lower than 60 ℃, reducing the water yield of the adjustable spraying device with the controlled water yield until the temperature is 100 ℃; when the temperature of the temperature measuring device is higher than 200 ℃, the water outlet quantity of the controllable water quantity adjustable spraying device is increased and/or the rotating speed of the cylinder body is reduced.
The technical scheme adopted by the invention has the following advantages:
1) the periphery of the cooling cylinder is cooled by water spray, the water amount is relatively large, the high-temperature pellets roll in the cylinder body, the cooling is uniform, and the cooling speed is high, so that the material cannot be too high in temperature when reaching the cylindrical screen;
2) the upper part of the cylindrical sieve is cooled by spraying, so that the pellets are further cooled during sieving, and a certain dust fall effect is achieved;
3) spray cooling is adopted for cooling, so that the water consumption is greatly reduced, the water consumption is accurate and adjustable, the temperature of the pellets can be reduced to a certain temperature, and the overhigh water content is avoided;
4) the periphery of the equipment foundation is provided with a water collecting tank, so that cooling water can be recovered and reused after treatment;
5) the chute below the cylindrical screen is a step-shaped chute, so that the blanking speed of materials can be reduced, and the materials are accumulated at the step, so that the effect of material grinding is achieved, and the durability of the chute can be increased;
6) the cylindrical screen is connected with the cooling cylinder by bolts, and the cylindrical screen is easy to wear and can be disassembled and replaced;
7) the high-temperature pellets slowly roll in the cylinder, the impact is small, and the pulverization rate of the pellets is low;
8) the device not only achieves the effect of cooling the high-temperature pellets, but also achieves the effect of screening the pellets.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural view of a cooling and screening apparatus for direct reduced iron in a rotary kiln according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view taken at A-A in FIG. 1.
FIG. 3 is a schematic sectional view taken at B-B in FIG. 1.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Examples
The cooling and screening device for direct reduced iron in a rotary kiln of the embodiment comprises a cooling cylinder 3, a cylindrical screen 4 and a screen-undersize chute 6 as shown in figure 1. The discharge part of the cylindrical screen is provided with a heat-resistant adhesive tape machine 5, and a heat-resistant adhesive tape machine 7 is arranged below the undersize chute 6.
The embodiment is provided with two controllable water amount adjustable spraying devices, the periphery of the cooling cylinder and the upper part of the cylindrical screen are all provided with flow meters and valves, and the water amount is adjustable. The material temperature at the tail of the cooling cylinder is reduced to 200 ℃, and the material temperature at the tail of the cylinder screen and the material temperature under the screen is reduced to below 160 ℃.
The machine tail of the cylindrical screen 4 of the embodiment is provided with a temperature measuring device 9.
When the direct reduced iron cooling and screening device is used, direct reduced iron 1 is discharged from a rotary kiln chute 2 into a cooling cylinder 3. During initial cooling, the water quantity of the spraying device with the adjustable controlled water quantity around the cooling cylinder is fully opened, and the temperature of the temperature measuring device 9 is monitored. When the temperature of the temperature measuring device 9 is lower than 60 ℃, adjusting the valves of the controlled water quantity adjustable spraying device at the cooling cylinder 3 and the cylindrical screen 4, and reducing the water quantity until the temperature of the temperature measuring device 9 is about 100 ℃; when the temperature of the temperature measuring device is higher than 200 ℃, the rotating speed of the cylinder body is reduced, and the water spraying amount is increased.
The present invention is not limited to the above embodiments, and any structural manner and embodiments similar to the technical solution are not creatively designed, and all of them should fall within the protection scope of the present invention.
Claims (5)
1. A novel cooling and screening device for direct reduced iron is characterized by comprising a cooling cylinder, a cylindrical screen, a downsize chute and a heat-resistant rubber belt conveyor which are sequentially arranged, wherein the cooling cylinder is connected with the cylindrical screen through a bolt, controllable water amount adjustable spraying devices are arranged on the peripheries of the cooling cylinder and the cylindrical screen, and spray heads of the controllable water amount adjustable spraying devices are arranged at intervals in the length direction of a cylinder body and a screen body; a temperature measuring device is arranged at the tail of the cylindrical screen;
the temperature measuring device also comprises a control device, when the temperature at the temperature measuring device is lower than 60 ℃, the control device outputs a control signal to reduce the water yield of the controllable water yield adjustable spraying device until the temperature at the temperature measuring device is 100 ℃; when the temperature of the temperature measuring device is higher than 200 ℃, the control device outputs a control signal to increase the water outlet quantity of the controllable water quantity adjustable spraying device and/or reduce the rotating speed of the cylinder.
2. The new cooling and screening apparatus for direct reduced iron according to claim 1,
the chute below the cylindrical screen is a step-shaped chute.
3. The new cooling screen apparatus for DRI as recited in claim 1, wherein said cooling drum has a front section provided with refractory material and a rear section provided with wear-resistant lining.
4. The new cooling screen apparatus for DRI according to claim 1, wherein said cooling drum body is provided with a heat conducting plate.
5. A method of cooling screening in an apparatus as claimed in claim 1, wherein said method comprises: monitoring the temperature of the screen tail of the cylinder in real time, and when the temperature of the temperature measuring device is lower than 60 ℃, reducing the water yield of the adjustable spraying device with the controlled water yield until the temperature is 100 ℃; when the temperature of the temperature measuring device is higher than 200 ℃, the water outlet quantity of the controllable water quantity adjustable spraying device is increased and/or the rotating speed of the cylinder body is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185386.2A CN114875193A (en) | 2022-02-28 | 2022-02-28 | Novel cooling and screening device and method for direct reduced iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185386.2A CN114875193A (en) | 2022-02-28 | 2022-02-28 | Novel cooling and screening device and method for direct reduced iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114875193A true CN114875193A (en) | 2022-08-09 |
Family
ID=82667090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210185386.2A Pending CN114875193A (en) | 2022-02-28 | 2022-02-28 | Novel cooling and screening device and method for direct reduced iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114875193A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690227A (en) * | 2004-04-26 | 2005-11-02 | 中国地质科学院 | Process for producing direct reduced iron with coal as reducer |
| JP2010007163A (en) * | 2008-06-30 | 2010-01-14 | Sumitomo Metal Ind Ltd | Method for producing reduced iron agglomerate for steel-making |
| CN202072720U (en) * | 2011-05-16 | 2011-12-14 | 重庆赛迪工业炉有限公司 | High-temperature direct reduced iron cooling system |
| CN102586532A (en) * | 2012-03-08 | 2012-07-18 | 江苏沙钢集团有限公司 | Direct reduction iron cooling device |
| CN111014008A (en) * | 2019-12-05 | 2020-04-17 | 中冶华天工程技术有限公司 | Direct reduced iron cooling and screening device |
-
2022
- 2022-02-28 CN CN202210185386.2A patent/CN114875193A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690227A (en) * | 2004-04-26 | 2005-11-02 | 中国地质科学院 | Process for producing direct reduced iron with coal as reducer |
| JP2010007163A (en) * | 2008-06-30 | 2010-01-14 | Sumitomo Metal Ind Ltd | Method for producing reduced iron agglomerate for steel-making |
| CN202072720U (en) * | 2011-05-16 | 2011-12-14 | 重庆赛迪工业炉有限公司 | High-temperature direct reduced iron cooling system |
| CN102586532A (en) * | 2012-03-08 | 2012-07-18 | 江苏沙钢集团有限公司 | Direct reduction iron cooling device |
| CN111014008A (en) * | 2019-12-05 | 2020-04-17 | 中冶华天工程技术有限公司 | Direct reduced iron cooling and screening device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20220809 |