CN106802088B - External cooling device and method for thermal state direct reduction iron furnace - Google Patents
External cooling device and method for thermal state direct reduction iron furnace Download PDFInfo
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- CN106802088B CN106802088B CN201710102691.XA CN201710102691A CN106802088B CN 106802088 B CN106802088 B CN 106802088B CN 201710102691 A CN201710102691 A CN 201710102691A CN 106802088 B CN106802088 B CN 106802088B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
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- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0286—Cooling in a vertical, e.g. annular, shaft
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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Abstract
The invention relates to a device and a method for cooling the outside of a thermal state direct reduction iron furnace, wherein the device consists of a self-caching chamber, a distribution chamber, a cooling chamber and a discharging chamber; a cylindrical barrel and a conical barrel are arranged in the distribution chamber, and 3 annular material channels are sequentially formed on the outer side of the cylindrical barrel; the bottoms of the cylindrical barrel and the conical barrel are correspondingly connected with the cooling chamber shell and the tops of the 3 annular partition plates one by one, and the annular partition plates divide the cooling chamber into an inner annular cooling space, a central annular cooling space and an outer annular cooling space along the radial direction; a plurality of cooling walls are uniformly arranged in the cooling chamber along the circumferential direction, and each annular partition plate and each cooling wall divide the cooling chamber into a plurality of cooling grid chambers with vertical material descending channels along the radial direction and the circumferential direction. The invention realizes the centralization and large-scale of the direct reduced iron mixture cooling device outside the furnace, can ensure the uniform and consistent cooling effect of the discharged reduced iron mixture after cooling, and simultaneously has the function of storing direct reduced iron.
Description
Technical Field
The invention relates to the technical field of coal-based direct reduced iron production, in particular to a device and a method for cooling a thermal state direct reduced iron furnace.
Background
In the process of producing direct reduced iron by a coal-based vertical furnace, after cooling in the furnace, the temperature of a direct reduced iron mixture (direct reduced iron, carbon residue and ash content) discharged from the vertical furnace is about 300-400 ℃. Considering that the direct reduced iron has high chemical activity and is highly liable to self-ignition, even explosion and fire, the direct reduced iron must be cooled to a certain temperature before it can be safely transported and stored.
At present, the direct reduction iron furnace external cooling method mainly adopts a direct water cooling or indirect water cooling mode for cooling, wherein the direct water cooling has high cooling efficiency, but the material is easy to crack, and the iron is oxidized by water to produce more ferroferric oxide, so that the metallization rate of the iron is reduced; indirect water cooling is mainly carried out by the following means: the water-cooled membrane wall or the water-cooled sleeve is arranged below the discharge port of the vertical furnace to indirectly cool the direct reduced iron mixture, but the cooling mode has the following defects: (1) The water-cooling film type wall or the water-cooling sleeve occupies a certain space height, so that the space height of the vertical furnace is increased, and the construction cost and difficulty are increased; (2) Under the engineering condition, a water-cooling membrane wall or a water-cooling sleeve is required to be arranged below each discharge port of the vertical furnace, which means that a plurality of water-cooling membrane walls or water-cooling sleeves are arranged in the whole engineering, and the cooling device cannot be centralized.
The traditional water-cooling membrane wall or water-cooling sleeve is round or square as a whole and exchanges heat from inside to outside. The downward moving speed of the material close to the cooling wall is lower than that of the material at the central position due to the resistance of the cooling wall, so that the residence time of the material at the central position in the cooler is shorter than that of the material close to the cooling wall. In addition, the heat transfer efficiency of the material at the center and the water-cooling film wall or the water-cooling sleeve is much smaller than that of the material close to the cooling wall. For the two reasons, the traditional water-cooling film wall or water-cooling sleeve device is large in size, and the cooling effect is poor due to the fact that the distance between the material at the center of the traditional water-cooling film wall or water-cooling sleeve device and the cooling wall is increased.
Therefore, the conventional cooling apparatus cannot be made centralized and large-sized, and cannot meet the demand for increasing the production scale of direct reduced iron.
Disclosure of Invention
The invention provides a thermal state direct reduced iron furnace external cooling device and a method, which realize the centralization and large-scale of the direct reduced iron mixture external cooling device, can ensure the uniform and consistent cooling effect of the discharged reduced iron mixture after cooling, and simultaneously has the function of storing direct reduced iron.
In order to achieve the purpose, the invention adopts the following technical scheme:
an external cooling device of a thermal state direct reduction iron furnace comprises a cooling device; the cooling device consists of a cache chamber, a distribution chamber, a cooling chamber and a discharge chamber which are sequentially arranged from top to bottom; a feed inlet is formed in the top of the cache chamber; 1 cylindrical barrel and 3 conical barrels are coaxially arranged in the distribution chamber from inside to outside, wherein the top of the cylindrical barrel is closed, and 3 annular material channels with flared downward openings are sequentially formed on the outer side of the cylindrical barrel; the bottoms of the cylindrical barrel and the conical barrel are correspondingly connected with the cooling chamber shell and the tops of the 3 annular partition plates one by one, and the annular partition plates divide the cooling chamber into an inner annular cooling space, a central annular cooling space and an outer annular cooling space along the radial direction; a plurality of cooling walls are uniformly arranged in the cooling chamber along the circumferential direction, and the annular partition plates and the cooling walls divide the cooling chamber into a plurality of cooling grid chambers with vertical material descending channels along the radial direction and the circumferential direction; the bottom of the discharge chamber is provided with a discharge opening.
The cooling wall is composed of a long cooling wall, an intermediate cooling wall and a short cooling wall which are sequentially arranged at intervals and in a circulating mode, wherein the long cooling wall is arranged in the annular cooling space from the inner layer to the outer layer in a full-length mode, the intermediate cooling wall is arranged in the annular cooling space from the central cooling space to the outer layer in a full-length mode, and the short cooling wall is arranged in the annular cooling space on the outer layer in a full-length mode.
The distance between the long cooling wall, the middle cooling wall and the short cooling wall is 300-600 mm.
And the feed inlet of the buffer chamber is connected with the discharge outlet of the vertical furnace through a heat-resistant chain plate conveyor.
The buffer chamber is internally provided with a material level meter, the discharging chamber is internally provided with a plurality of online temperature measuring devices along the center and the circumferential direction of the same horizontal section, and the material level meter and the online temperature measuring devices are respectively connected with a control system.
And a plurality of material blocking rod sockets are uniformly arranged in the material discharging chamber below the online temperature measuring device along the same horizontal section.
The cooling wall is formed by juxtaposing a plurality of wear-resistant seamless steel pipes, and adjacent wear-resistant seamless steel pipes are fixedly connected through wear-resistant steel plates; the bottom of the wear-resistant seamless steel pipe is connected with a cooling water inlet circular pipeline outside the cooling device through a cooling water inlet rectangular pipeline; the top of the wear-resistant seamless steel pipe is connected with a cooling water outlet circular pipeline outside the cooling device through a cooling water outlet rectangular pipeline.
The external cooling method of the thermal state direct reduced iron furnace based on the device comprises the following steps:
1) The hot direct reduced iron mixture discharged from the vertical furnace is conveyed to the upper part of the cooling device by a heat-resistant chain plate conveyor and enters a buffer chamber from a feed inlet;
2) The material level meter uploads the material level information in the cache chamber to the control system in real time; the upper limit value and the lower limit value of the material level are preset in the control system, and when the material level in the cache chamber is higher than the upper limit value of the material level, the heat-resistant chain plate conveyor stops distributing materials into the cache chamber; when the material level in the buffer chamber is lower than the material level lower limit value, the discharging chamber stops discharging outwards; and the distribution chamber, the cooling chamber and the discharge chamber in the cooling device are ensured to be filled with materials all the time;
3) The distribution chamber is used for uniformly distributing the materials in the buffer chamber into the cooling chamber; the 3 annular material channels formed by the cylindrical cylinder and the conical cylinder correspondingly distribute the materials into 3 layers of cooling spaces formed by the separation of 3 annular clapboards in the cooling chambers, and further move downwards along the vertical material descending channels of the cooling cells;
4) In each cooling grid chamber, cooling water enters from the lower part of the cooling wall and flows out from the upper part of the cooling wall, and the materials reach the temperature capable of being safely transported and stored through the indirect cooling effect of each cooling wall;
5) The discharge chamber is used for uniformly discharging the cooled material out of the cooling device; a plurality of online temperature measuring devices are arranged on the same horizontal section of the discharge chamber, and the online temperature measuring devices upload the measured material temperature data to the control system in real time; a plurality of material blocking rod sockets are arranged below the online temperature measuring device along the same horizontal section; if the material temperature measured by a certain online temperature measuring device is higher, the material falling speed near the temperature measuring point is higher, and the cooling retention time is insufficient, the material blocking rod below the online temperature measuring device is encrypted, so that the material falling speed in the corresponding material channel is slow; on the contrary, if the material temperature measured by a certain online temperature measuring device is lower, the material falling speed near the temperature measuring point is lower, and the cooling retention time is overlong, the material blocking rods below the online temperature measuring device are reduced, so that the material falling speed in the corresponding material channel is accelerated; thereby leading the temperature of the materials discharged from the discharge chamber to be consistent; the discharge port of the discharge chamber is provided with a variable-frequency speed-regulating electric format valve, and the material cooled to the set temperature is discharged out of the cooling device.
Compared with the prior art, the invention has the beneficial effects that:
1) The structure is simple and reasonable, the manufacturing cost is low, and the centralized and large-scale requirements of the direct reduced iron mixture cooling device are met;
2) Through the cellular cooling of the cooling chamber and the combined adjustment of the online temperature measurement of the discharge chamber and the material blocking rod, the cooling effect of the direct reduced iron mixture discharged by the cooling device is ensured to be uniform;
3) Realizes the integration of cooling outside the furnace and storage and transportation of the thermal state direct reduced iron, and saves the engineering investment cost.
Drawings
Fig. 1 is a front view of the cooling device of the present invention.
Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A in fig. 1.
Fig. 3 is a sectional view B-B in fig. 1.
Fig. 4 is a cross-sectional view taken along line C-C of fig. 1.
Fig. 5 is a cross-sectional view taken along line D-D in fig. 2.
Fig. 6 is a cross-sectional view E-E of fig. 2.
Fig. 7 is a sectional view F-F in fig. 2.
Fig. 8 is a sectional view taken along line G-G in fig. 5.
In the figure: 1. the heat-resistant chain plate conveyor comprises a heat-resistant chain plate conveyor 2, a buffer chamber 3, a distribution chamber 4, a cooling chamber 5, a discharge chamber 6, a charge level indicator 7.1# conical cylinder 8.2# conical cylinder 9.3# conical cylinder 10, a cylindrical cylinder 11, a distribution chamber reinforcing rib plate 12, a cooling chamber shell 13, a cooling chamber reinforcing rib plate 14.1# annular partition plate 15.2# annular partition plate 16.3# annular partition plate 17, a short cooling wall 18, a middle cooling wall 19, a long cooling wall 20.1# cooling grid chamber 21.2# cooling grid chamber 22.3# cooling grid chamber 23, a wear-resistant seamless steel pipe 24, a wear-resistant steel plate 25, a cooling water inlet circular pipeline 26, a cooling water inlet rectangular pipeline 27, a cooling water outlet rectangular pipeline 28, a cooling water outlet circular pipeline 29, an electric grid valve 30, an online temperature measuring device 31, a material retaining rod and a material outlet circular pipeline 26
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the invention relates to an external cooling device of a thermal state direct reduction iron furnace, which comprises a cooling device; the cooling device consists of a buffer chamber 2, a distribution chamber 3, a cooling chamber 4 and a discharge chamber 5 which are arranged in sequence from top to bottom; the top of the buffer chamber 2 is provided with a feed inlet; 1 cylindrical barrel 10 and 3 conical barrels 7-9 are coaxially arranged in the distribution chamber 3 from inside to outside, wherein the top of the cylindrical barrel 10 is closed, and 3 annular material channels with downward-unfolded bell mouths are sequentially formed on the outer side of the cylindrical barrel 10; the bottoms of the cylindrical barrel 10 and the conical barrels 7-9 are correspondingly connected with the shell 12 of the cooling chamber 4 and the tops of the 3 annular clapboards 14-16 one by one, and the annular clapboards 14-16 divide the cooling chamber 4 into an inner annular cooling space, a central annular cooling space and an outer annular cooling space along the radial direction; a plurality of cooling walls 17-19 are uniformly arranged in the cooling chamber 4 along the circumferential direction, and the cooling chamber 4 is divided into a plurality of cooling grid chambers 20-22 with vertical material descending channels along the radial direction and the circumferential direction by the annular partition plates 14-16 and the cooling walls 17-19; the bottom of the discharge chamber 5 is provided with a discharge opening.
The cooling walls 17-19 are composed of long cooling walls 19, middle cooling walls 18 and short cooling walls 17 which are sequentially arranged at intervals and in a circulating mode, wherein the long cooling walls 19 are arranged in the inner-layer annular cooling space to the outer-layer annular cooling space in a whole length mode, the middle cooling walls 18 are arranged in the central annular cooling space to the outer-layer annular cooling space in a whole length mode, and the short cooling walls 17 are arranged in the outer-layer annular cooling space in a whole length mode.
The distance between the long cooling walls 19, the middle cooling walls 18 and the short cooling walls 17 is 300-600 mm.
The feed inlet of the buffer chamber 2 is connected with the discharge outlet of the vertical furnace through a heat-resistant chain plate conveyor 1.
The buffer chamber 2 is internally provided with a material level meter 6, a plurality of online temperature measuring devices 30 are arranged at the center and the circumference of the same horizontal section in the material discharge chamber 5, and the material level meter 6 and the online temperature measuring devices 30 are respectively connected with a control system.
A plurality of material blocking rod sockets are uniformly arranged in the discharging chamber 5 below the online temperature measuring device 30 along the same horizontal section.
The cooling walls 17-19 are formed by a plurality of wear-resistant seamless steel tubes 23 in parallel, and the adjacent wear-resistant seamless steel tubes 23 are fixedly connected through wear-resistant steel plates 24; the bottom of the wear-resistant seamless steel pipe 23 is connected with a cooling water inlet circular pipeline 25 outside the cooling device through a cooling water inlet rectangular pipeline 26; the top of the wear-resistant seamless steel pipe 23 is connected with a cooling water outlet circular pipeline 28 outside the cooling device through a cooling water outlet rectangular pipeline 27.
The external cooling method of the thermal state direct reduced iron furnace based on the device comprises the following steps:
1) The hot direct reduced iron mixture discharged from the vertical furnace is conveyed to the upper part of the cooling device by a heat-resistant chain plate conveyor 1 and enters a buffer chamber 2 from a feeding hole;
2) The level indicator 6 uploads the level information in the cache chamber 2 to the control system in real time; the upper limit value and the lower limit value of the material level are preset in the control system, and when the material level in the buffer chamber 2 is higher than the upper limit value of the material level, the heat-resistant chain plate conveyor 1 stops distributing materials into the buffer chamber 2; when the material level in the buffer chamber 2 is lower than the material level lower limit value, the discharging chamber 5 stops discharging outwards; and the distribution chamber 3, the cooling chamber 4 and the discharge chamber 5 in the cooling device are ensured to be filled with materials all the time;
3) The distribution chamber 3 is used for uniformly distributing the material in the buffer chamber 2 to the cooling chamber 4; the 3 annular material channels composed of the cylindrical barrel 10 and the conical barrels 7-9 correspondingly distribute the materials into 3 layers of cooling spaces formed by 3 annular clapboards 14-16 in the cooling chamber 4, and further move downwards along the vertical material descending channels of the cooling chambers 20-22;
4) In each cooling grid chamber 20-22, cooling water enters from the lower part of the cooling wall 17-19 and flows out from the upper part of the cooling wall 17-19, and the materials reach the temperature capable of being safely transported and stored through the indirect cooling effect of each cooling wall 17-19;
5) The discharge chamber 5 is used for uniformly discharging the cooled material out of the cooling device; a plurality of online temperature measuring devices 30 are arranged on the same horizontal section of the discharge chamber 5, and the online temperature measuring devices 30 upload the measured material temperature data to the control system in real time; a plurality of material blocking rod sockets are arranged along the same horizontal section below the online temperature measuring device 30; if the temperature of the material measured by a certain online temperature measuring device 30 is higher, which indicates that the descending speed of the material near the temperature measuring point is higher and the cooling retention time is insufficient, the material blocking rod 31 below the online temperature measuring device 30 is encrypted, so that the descending speed of the material in the corresponding material channel is slow; on the contrary, if the temperature of the material measured by a certain on-line temperature measuring device 30 is low, which indicates that the descending speed of the material near the temperature measuring point is slow, and the cooling retention time is too long, the material blocking rods 31 below the on-line temperature measuring device 30 are reduced, so that the descending speed of the material in the corresponding material channel is accelerated; thereby leading the temperature of the materials discharged from the discharge chamber 5 to be consistent; the discharge port of the discharge chamber 5 is provided with a variable frequency speed regulating electric format valve 29, and the material cooled to the set temperature is discharged out of the cooling device.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the embodiment, the external cooling device of the thermal direct reduced iron furnace is adopted to cool the direct reduced iron mixture discharged from the vertical furnace to the temperature (generally below 100 ℃) capable of being transported and stored, the direct reduced iron mixture discharged from the vertical furnace is conveyed to the cooling device through the heat-resistant chain plate conveyor, the whole transportation process can be sealed, and the escape of dust is reduced to the greatest extent.
A material level meter 6 is arranged at the top of the buffer chamber 2 of the cooling device, and the material level meter 6 uploads the material level information of the buffer chamber 2 to the control system in real time. A highest material level upper limit value and a lowest material level lower limit value are preset in the control system, and when the measured material level is higher than the material level upper limit value, the heat-resisting chain plate conveyor 1 stops distributing materials into the cache chamber 2. When the level is below the level lower limit, the electric format valve 29 stops discharging outward. Even if the material level of the buffer chamber 2 is at the lowest material level, the distribution chamber 3, the cooling chamber 4 and the discharge chamber 5 are ensured to be full of materials;
the main function of the distribution chamber 3 is to distribute the material in the buffer chamber 2 evenly to the cooling chamber 4. Referring to fig. 1, the distribution chamber is composed of concentric 1-3 # conical cylinders 7-9 and a cylindrical cylinder 10, wherein the outer 1# conical cylinder serves as the outer shell of the distribution chamber. The surface of the cylinder body in the material flowing area is lined with a wear-resistant lining plate, and the top of the cylindrical cylinder body 10 is closed. In order to ensure that the distribution chamber 3 has enough working strength, reinforcing rib plates 11 are arranged between the 1-3 # conical cylinders 7-9 and the cylindrical cylinder 10 for connection and fixation.
The main function of the cooling chamber 5 is to indirectly cool the material flowing through the cooling chamber 5 with cooling water to a temperature at which the material can be safely transported and stored. As shown in fig. 2, the cooling chamber 5 is divided into a plurality of independent cooling cells, namely 1 to 3# cooling cells 20 to 22, by the 1 to 3# annular partition plates 14 to 16, the cooling chamber shell 12 and the 1 to 3# cooling walls 17 to 19; the cooling cells 20-22 form a vertical material channel, the distance between the cooling walls 17, 18 and 19 at the two sides is within the range of 300-600 mm, and the cooling effect of the material at the central position in the cooling cells 20-22 is ensured. As the length of the No. 1 cooling grid 20 is larger, in order to ensure the working strength, an annular reinforcing rib plate 13 is fixedly connected at the radial middle position. Referring to fig. 5-8, cooling water inlet pipes 25-26 enter the wear-resistant seamless steel pipe 23 from the lower part of each cooling wall, and cooling water outlet pipes 27-28 flow out of the wear-resistant seamless steel pipe 23 from the upper part of the cooling wall.
The main function of the discharge chamber 5 is to discharge the material cooled by the cooling chamber 4 evenly out of the cooling device. Referring to fig. 3, a total of 9 online temperature measuring devices 30 are arranged on the same horizontal section of the discharge chamber 5, 1 is arranged at the central point of the horizontal section, and the other 8 are uniformly distributed at equal radius outside the central point, with an interval angle of 45 degrees; the online temperature measuring device 30 uploads the measured temperature parameters to the control system in real time. Referring to fig. 4, 24 material blocking rod insertion holes are uniformly arranged on the same horizontal section below the line temperature measuring device 30 along the same direction, and the temperature of the material finally discharged through the electric format valve 29 tends to be consistent by adjusting the number of the material blocking rods 31.
The No. 1-3 cooling walls 17-19 are formed by welding wear-resistant seamless steel pipes 23 and wear-resistant steel plates 24 at intervals.
The No. 1-3 annular partition plate and the cooling chamber shell are composed of concentric cylindrical wear-resistant steel plates.
As shown in fig. 5 and 8, the cooling water inlet pipe is composed of a cooling water inlet circular pipe 25 and a cooling water inlet rectangular pipe 26, and the cooling water inlet circular pipe 25 is connected with the cooling water inlet rectangular pipe 26 before entering the cooling device. The cooling water outlet pipe is composed of a cooling water outlet rectangular pipeline 27 and a cooling water outlet circular pipeline 28, and the cooling water outlet rectangular pipeline 27 is connected with the cooling water outlet circular pipeline 28 after being discharged from the cooling device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A method for cooling the outside of a hot direct reduced iron furnace is characterized by being realized based on a hot direct reduced iron furnace external cooling device, wherein the device comprises a cooling device; the cooling device consists of a cache chamber, a distribution chamber, a cooling chamber and a discharge chamber which are sequentially arranged from top to bottom; the top of the buffer chamber is provided with a feed inlet; 1 cylindrical barrel and 3 conical barrels are coaxially arranged in the distribution chamber from inside to outside, wherein the top of the cylindrical barrel is closed, and 3 annular material channels with flared downward openings are sequentially formed on the outer side of the cylindrical barrel; the bottoms of the cylindrical barrel and the conical barrel are correspondingly connected with the cooling chamber shell and the tops of the 3 annular partition plates one by one, and the annular partition plates divide the cooling chamber into an inner annular cooling space, a central annular cooling space and an outer annular cooling space in the radial direction; a plurality of cooling walls are uniformly arranged in the cooling chamber along the circumferential direction, and the annular partition plates and the cooling walls divide the cooling chamber into a plurality of cooling grid chambers with vertical material descending channels along the radial direction and the circumferential direction; the bottom of the discharge chamber is provided with a discharge opening;
the external cooling method of the thermal state direct reduced iron furnace comprises the following steps:
1) The hot direct reduced iron mixture discharged from the vertical furnace is conveyed to the upper part of the cooling device by a heat-resistant chain plate conveyor and enters a buffer chamber from a feed inlet;
2) The material level meter uploads the material level information in the cache chamber to the control system in real time; the upper limit value and the lower limit value of the material level are preset in the control system, and when the material level in the cache chamber is higher than the upper limit value of the material level, the heat-resistant chain plate conveyor stops distributing materials into the cache chamber; when the material level in the buffer chamber is lower than the material level lower limit value, the discharging chamber stops discharging outwards; and the distribution chamber, the cooling chamber and the discharge chamber in the cooling device are ensured to be filled with materials all the time;
3) The distribution chamber is used for uniformly distributing the materials in the buffer chamber into the cooling chamber; the 3 annular material channels formed by the cylindrical cylinder and the conical cylinder correspondingly distribute the materials into 3 layers of cooling spaces formed by the separation of 3 annular clapboards in the cooling chambers, and further move downwards along the vertical material descending channels of the cooling cells;
4) In each cooling grid chamber, cooling water enters from the lower part of the cooling wall and flows out from the upper part of the cooling wall, and the materials reach the temperature capable of being safely transported and stored through the indirect cooling effect of each cooling wall;
5) The discharge chamber is used for uniformly discharging the cooled material out of the cooling device; a plurality of online temperature measuring devices are arranged on the same horizontal section of the discharge chamber, and the online temperature measuring devices upload the measured material temperature data to the control system in real time; a plurality of material blocking rod sockets are arranged below the online temperature measuring device along the same horizontal section; if the material temperature measured by a certain online temperature measuring device is higher, which indicates that the material falling speed near the temperature measuring point is faster and the cooling retention time is insufficient, the material blocking rod below the online temperature measuring device is encrypted, so that the material falling speed in the corresponding material channel is slow; on the contrary, if the material temperature measured by a certain online temperature measuring device is low, the material descending speed near the temperature measuring point is slow, and the cooling retention time is too long, the material blocking rods below the online temperature measuring device are reduced, so that the material descending speed in the corresponding material channel is accelerated; thereby leading the temperature of the materials discharged from the discharge chamber to be consistent; the discharge port of the discharge chamber is provided with a variable-frequency speed-regulating electric format valve, and the material cooled to the set temperature is discharged out of the cooling device.
2. The external cooling method for hot state direct reduced iron furnace according to claim 1, wherein the stave is composed of a long stave, an intermediate stave and a short stave which are sequentially spaced and cyclically disposed, wherein the long stave is disposed substantially in the inner annular cooling space to the outer annular cooling space, the intermediate stave is disposed substantially in the central annular cooling space to the outer annular cooling space, and the short stave is disposed substantially in the outer annular cooling space.
3. The method as claimed in claim 2, wherein the long staves, the middle staves, and the short staves are spaced apart by 300 to 600mm.
4. The method of claim 1, wherein the inlet of the buffer chamber is connected to the outlet of the shaft furnace by a heat-resistant chain-scraper conveyor.
5. The method as claimed in claim 1, wherein a level meter is installed in the buffer chamber, a plurality of on-line temperature measuring devices are installed in the discharge chamber along the center and the circumferential direction of the horizontal cross-section, and the level meter and the on-line temperature measuring devices are respectively connected to the control system.
6. The method of claim 5, wherein a plurality of material blocking rod insertion openings are uniformly formed along the same horizontal cross section in the material discharge chamber below the on-line temperature measuring device.
7. The external cooling method for the hot state direct reduced iron furnace according to claim 1, wherein the cooling wall is composed of a plurality of wear-resistant seamless steel tubes arranged side by side, and adjacent wear-resistant seamless steel tubes are fixedly connected through wear-resistant steel plates; the bottom of the wear-resistant seamless steel pipe is connected with a cooling water inlet circular pipeline outside the cooling device through a cooling water inlet rectangular pipeline; the top of the wear-resistant seamless steel pipe is connected with a cooling water outlet circular pipeline outside the cooling device through a cooling water outlet rectangular pipeline.
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| CN107937652B (en) * | 2017-12-15 | 2023-05-16 | 中冶焦耐(大连)工程技术有限公司 | Efficient vertical furnace cooling chamber |
| CN107841587A (en) * | 2017-12-21 | 2018-03-27 | 中冶焦耐(大连)工程技术有限公司 | A kind of external-heat coal-based direct reduction iron shaft furnace process for layout and system |
| CN111893233B (en) * | 2020-07-14 | 2022-05-13 | 钢研晟华科技股份有限公司 | Hydrogen metallurgy shaft furnace system |
| CN115058553B (en) * | 2022-06-20 | 2023-11-03 | 水木明拓氢能源科技有限公司 | Shaft furnace reactor suitable for hydrogen direct reduction iron reaction and application thereof |
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| CN101915506A (en) * | 2010-08-20 | 2010-12-15 | 高玉宗 | Annular cooler |
| CN103759257A (en) * | 2013-12-31 | 2014-04-30 | 河南圣石节能环保工程有限公司 | Vertical type multi-cylinder slag cooler for solid-state blast furnace slag |
| CN103743229A (en) * | 2014-02-11 | 2014-04-23 | 黄石市建材节能设备总厂 | Cooler used in rotary kiln |
| CN104457320A (en) * | 2014-11-26 | 2015-03-25 | 江苏大峘集团有限公司 | Three-section compartment inner sleeve vertical type cooling device |
| CN104789760A (en) * | 2015-04-02 | 2015-07-22 | 山东理工大学 | Efficient cooling barrel body of reduced iron rotary barrel type cooling machine |
| CN206504633U (en) * | 2017-02-24 | 2017-09-19 | 中冶焦耐(大连)工程技术有限公司 | A kind of hot direct reduced iron stove external cooling device |
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