Lump ore drying system

Abstract

The lump ore drying system comprises an air supply mechanism and a drying mechanism, the air supply mechanism comprises a first air supply pipe, a second air supply pipe, a first draught fan and a second draught fan, the first draught fan is installed on the first air supply pipe, and the second draught fan is installed on the second air supply pipe; the drying mechanism comprises an ore tank body, a first drying assembly and a second drying assembly, the nozzle end of the first drying assembly and the nozzle end of the second drying assembly extend into the ore tank body, the first air supply pipe communicates with the first drying assembly, the second air supply pipe communicates with the second drying assembly, and the first drying assembly is located above the second drying assembly. Hot air is sprayed into the ore tank body through the second drying assembly to dry lump ore, water vapor and smoke generated during drying move upwards, under the heating effect of the first drying assembly, the water vapor is prevented from condensing and dewing on the upper portion of the ore tank body, and therefore follow-up dust removal work can be conducted smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of lump ore drying, in particular to a lump ore drying system. Background Art

[0002] The raw materials for pig iron required by the iron and steel industry are mainly provided by blast furnace smelting. The improvement of blast furnace smelting technology and the reduction of costs have extremely profound significance for promoting the development of iron and steel enterprises. The basic link of blast furnace intensification smelting is burden preparation. As one of the main components of the burden charged into the furnace, the addition amount of natural lump ore can reach up to 20%. Due to the high moisture content of lump ore, after the high-moisture lump ore is charged into the furnace, the drying of moisture consumes energy, and the drying process requires a certain amount of time, which increases the coke ratio of the blast furnace, thus affecting the permeability of the burden layer in the blast furnace, resulting in an increase in the blast furnace smelting cost and affecting the stability of the furnace condition. Therefore, reducing the moisture content of lump ore is of great significance for reducing the ironmaking cost and enhancing the stability of the furnace condition.

[0003] At present, in order to reduce the adverse effects of the moisture in lump ore on blast furnace production, domestic research scholars have conducted extensive research on lump ore drying technology. The Chinese patent "A Device and Method for Drying Lump Ore in a Stockyard by Using Sintering Ring Cooler Exhaust Gas" with the publication number CN111351369A. The above invention relates to a device and method for drying lump ore in a stockyard by using sintering ring cooler exhaust gas. In the present invention, during the storage of lump ore in the stockyard, the sintering ring cooler exhaust gas at a temperature higher than 100 °C is introduced into the evenly distributed distribution pipes from below the ground plane, and the pressurized sintering ring cooler exhaust gas penetrates through the lump ore to be dried and then is discharged from the upper part of the lump ore to be dried. After passing through the mobile gas collection mechanism arranged above the lump ore to be dried, it enters the newly installed waterproof bag filter for purification and then reaches the standard for discharge. The above invention still has the following problems in the application process. Because when directly using the sintering ring cooler exhaust gas at 100 °C for drying, condensation is likely to occur after the exhaust gas temperature drops, and the condensed exhaust gas is difficult to handle. Therefore, how to reasonably treat the dust-containing exhaust gas discharged during the drying of lump ore is also a difficult problem to be solved urgently.

[0004] In summary, there is an urgent need for a lump ore drying system to solve or at least partially solve the problems existing in the prior art. Content of the Utility Model

[0005] The purpose of the utility model is to provide a lump ore drying system, aiming to solve the problem that condensation is likely to occur after the temperature of the drying exhaust gas of the existing equipment drops. The specific technical solution is as follows:

[0006] A lump ore drying system includes an air supply mechanism and a drying mechanism. The air supply mechanism includes a first air supply pipe, a second air supply pipe, a first fan, and a second fan. The first fan is installed on the first air supply pipe, and the second fan is installed on the second air supply pipe. The temperature in the first air supply pipe is higher than that in the second air supply pipe. The drying mechanism includes a ore trough body, a first drying component, and a second drying component. The nozzle end of the first drying component extends into the ore trough body, and the nozzle end of the second drying component also extends into the ore trough body. The first air supply pipe is connected to the first drying component, and the second air supply pipe is connected to the second drying component. And the first drying component is located above the second drying component.

[0007] Further, the second drying component includes an air supply pipe, a ring pipe, and a nozzle. The first end of the air supply pipe is connected to the second air supply pipe, and the second end of the air supply pipe is connected to the ring pipe. The ring pipe is arranged around the outer periphery of the ore trough body. The first end of the nozzle is connected to the ring pipe, and the second end of the nozzle penetrates the outer wall of the ore trough body and extends into the ore trough body.

[0008] Further, a plurality of nozzles are arranged, and the plurality of nozzles are distributed circumferentially along the ore trough body. And the nozzle of each nozzle is arranged to incline upward in the direction from outside to inside.

[0009] Further, it also includes a first dust removal mechanism. The first dust removal mechanism is located downstream of the drying mechanism. The first dust removal mechanism includes a gas collection hood, an annular skirt plate, a sealing curtain, a first screen, and a second screen. The sealing curtain, the annular skirt plate, and the gas collection hood are arranged from bottom to top in sequence. The first screen and the second screen are arranged inside the annular skirt plate. The first screen is located above the second screen, and the diameter of the mesh holes in the first screen is smaller than that in the second screen. The lower part of the gas collection hood is connected to the inside of the ore trough body through the annular skirt plate and the sealing curtain. A gas collection outlet is arranged at the top of the gas collection hood.

[0010] Further, the first dust removal mechanism also includes a first vibration motor and a second vibration motor. Both the first vibration motor and the second vibration motor are arranged outside the annular skirt plate. First extension plates are arranged at both ends of the first screen, and the first extension plates extend out of the annular skirt plate. The first vibration motor is fixed on the first extension plate. Second extension plates are arranged at both ends of the second screen, and the second extension plates extend out of the annular skirt plate. The second vibration motor is installed on the second extension plate.

[0011] Further, it further includes a second dust removal mechanism. The second dust removal mechanism is arranged at the downstream end of the first dust removal mechanism and is communicated with the first dust removal mechanism. The second dust removal mechanism includes a housing, a partition plate and a heating component. The partition plate is horizontally arranged in the housing, separating a dust removal chamber located in the upper part and an ash collection chamber located in the lower part. The heating component is arranged on the partition plate, and the dust removal chamber is arranged around the heating component. The second dust removal mechanism further includes a dust removal net, and the dust removal net is arranged in the dust removal chamber. An air inlet and an air outlet are arranged on the housing. The air inlet is communicated with the lower part of the dust removal chamber and is communicated with the gas collection outlet of the first dust removal mechanism. The air outlet is communicated with the upper part of the dust removal chamber. A dust leakage hole is provided on the partition plate. The upper end of the dust leakage hole is communicated with the ash collection chamber, and the lower end of the dust leakage hole is communicated with the ash collection chamber. A dust cleaning hole is arranged at the bottom of the housing, and the dust cleaning hole is communicated with the ash collection chamber.

[0012] Further, the heating component includes a conical cylinder, a gas pipe, an air supply pipe and an igniter. The conical cylinder is vertically arranged on the upper part of the partition plate, and the small end of the conical cylinder faces upward. The small end of the conical cylinder is fixedly connected to the inner wall of the housing, and the large end of the conical cylinder is fixedly connected to the housing. The partition plate, the conical cylinder and the housing enclose a combustion chamber. The igniter is arranged at the bottom of the combustion chamber. The gas pipe and the air supply pipe are both communicated with the bottom of the combustion chamber, and the outlets of the gas pipe and the air supply pipe both face the igniter. An exhaust port is arranged at the top of the combustion chamber.

[0013] Further, a plurality of dust removal nets are arranged, and the plurality of dust removal nets are distributed up and down. From top to bottom, the mesh holes on different dust removal nets increase in sequence.

[0014] Further, the dust removal net is in a frustum shape, and the end with a smaller diameter of the dust removal net faces downward; a dust chute is arranged on the outer periphery of the conical cylinder, and the dust chute is arranged along the generatrix direction of the conical cylinder.

[0015] Further, the second dust removal mechanism further includes a heat preservation layer, and the heat preservation layer is wrapped outside the housing.

[0016] Applying the technical solution of the present utility model has the following beneficial effects:

[0017] When drying the lump ore in the ore bin body, the hot air from the fourth stage of the annular cooler is transported to the first drying component through the first air supply pipe and the first fan, and the ore in the ore bin body is dried by blowing hot air through the first drying component. The hot air from the fifth stage of the annular cooler is transported to the second drying component through the second air supply pipe and the second fan, and the ore in the ore bin body is dried by blowing hot air through the second drying component. It can be known that the temperature of the hot air output from the fourth stage of the annular cooler is higher than that of the hot air output from the fifth stage of the annular cooler. Therefore, the temperature of the hot air transported to the first drying component through the first air supply pipe and the first fan is higher than that of the hot air transported to the second drying component through the second air supply pipe and the second fan. The advantage of such an arrangement is that when the second drying component sprays hot air into the ore bin body, as the hot air rises, the water vapor in the ore bin body also rises. When it reaches the first drying component, the water vapor absorbs heat under the action of the first drying component, preventing the water vapor from condensing and dewing at the upper part of the ore bin body, so that the subsequent dust removal work can be carried out smoothly.

[0018] In addition to the purposes, features and advantages described above, the present utility model has other purposes, features and advantages. The following will refer to Figures 1-5 and make a further detailed description of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0020] Figure 1 is the overall structural schematic diagram of a lump ore drying system of the present utility model;

[0021] Figure 2 is Figure 1 the enlarged view of part A in

[0022] Figure 3 is the overall structural schematic diagram of the first dust removal mechanism in a lump ore drying system of the present utility model;

[0023] Figure 4 is the overall structural schematic diagram of the second dust removal mechanism in a lump ore drying system of the present utility model;

[0024] Figure 5 is the partial enlarged schematic diagram of the conical cylinder in a lump ore drying system of the present utility model.

[0025] Among them, 1. Air supply mechanism; 11. First air supply duct; 12. Second air supply duct; 13. First fan; 14. Second fan; 2. Drying mechanism; 21. Ore bin body; 22. First drying component; 23. Second drying component; 231. Air supply pipe; 232. Ring pipe; 233. Sprinkler head; 3. First dust removal mechanism; 31. Air collection hood; 32. Annular skirt plate; 33. Sealing curtain; 34. First screen; 35. Second screen; 36. First vibration motor; 37. Second vibration motor; 4. Second dust removal mechanism; 41. Housing; 411. Dust removal chamber; 412. Ash collection chamber; 413. Air inlet; 414. Air outlet; 415. Ash cleaning hole; 42. Partition board; 421. Ash leakage hole; 43. Heating component; 431. Cone; 4311. Ash chute; 432. Gas pipe; 433. Air supply pipe; 434. Igniter; 435. Combustion chamber; 436. Exhaust port; 44. Dust removal net; 45. Heat preservation layer; 5. Ring cooler; 51. First hot air hood; 52. Second hot air hood; 53. Third hot air hood; 54. Electric valve; 55. Connecting pipe; 56. Conveyor fan; 6. Hot air duct; 7. Waste heat recovery device; 8. Blast furnace gas purification system; 9. Bag filter; 10. Chimney. Detailed implementation mode

[0026] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below, and preferred embodiments of the present utility model are given. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present utility model more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0028] Embodiment:

[0029] See Figures 1-5, this embodiment provides a lump ore drying system, including a gas supply mechanism 1 and a drying mechanism 2. The gas supply mechanism 1 includes a first air supply pipe 11, a second air supply pipe 12, a first fan 13 and a second fan 14. The first fan 13 is installed on the first air supply pipe 11, and the second fan 14 is installed on the second air supply pipe 12. The temperature in the first air supply pipe 11 is higher than that in the second air supply pipe 12. The drying mechanism 2 includes a trough body 21, a first drying component 22 and a second drying component 23. The nozzle end of the first drying component 22 extends into the trough body 21, and the nozzle end of the second drying component 23 also extends into the trough body 21. The first air supply pipe 11 is communicated with the inlet of the first drying component 22, and the second air supply pipe 12 is communicated with the inlet of the second drying component 23. And the first drying component 22 is located above the second drying component 23.

[0030] Specifically, the function of the gas supply mechanism 1 part is to introduce the hot air of the ring cooler 5 to the drying mechanism 2. Refer to Figure 1 , Figure 1 In [reference], the ring cooler 5 is a planar development view, which is divided into five levels of cooling. A fan is installed below each level, and natural air is blown into the ring cooler 5 through the fan to cool the sintered materials in each level. Figure 1 The sintered materials being cooled move from right to left. The sintered materials enter the ring cooler 5 from the right and exit the ring cooler 5 from the left (actually, the sintered materials move along the circumferential direction of the ring cooler 5 in the ring cooler 5). From Figure 1As shown in the figure, when the annular cooler 5 is cooling, the sintered material moves from right to left. As the temperature of the sintered material in the annular cooler 5 decreases, the temperature of the hot air output from above the annular cooler 5 gradually decreases from right to left. The high-temperature gas output from the three stages on the right side of the annular cooler 5 is connected to the waste heat recovery device 7 through the hot air pipe 6, and the waste heat recovery device 7 is used to recover and utilize the hot air. (For example, in a preheating boiler, the waste heat utilization of the high-temperature hot air in the annular cooler 5 is currently very mature and will not be elaborated here. The high temperature mentioned in the text refers to the temperature between 210 degrees Celsius and 600 degrees Celsius). In addition, a first hot air hood 51, a second hot air hood 52, a third hot air hood 53 and an electric valve 54 are arranged above the annular cooler 5. The first hot air hood 51 is arranged on the fourth stage of the annular cooler 5. The hot air (with a temperature between 150 degrees Celsius and 210 degrees Celsius) in the first hot air hood 51 is transported to the first drying component 22 above the ore bin body 21 through the first fan 13 and the first air supply pipe 11, and is sprayed onto the lump ore in the ore bin body 21 through the first drying component 22 to dry the lump ore in the ore bin body 21. The second hot air hood 52 is arranged on the fifth stage of the annular cooler 5. The hot air (with a temperature between 90 degrees Celsius and 150 degrees Celsius) in the second hot air hood 52 is transported to the second drying component 23 below the ore bin body 21 through the second fan 14 and the second air supply pipe 12, and is sprayed onto the lump ore in the ore bin body 21 through the second drying component 23 to dry the lump ore in the ore bin body 21. The third hot air hood 53 is arranged on the fifth stage of the annular cooler 5. On the one hand, the third hot air hood 53 is connected to the second air supply pipe 12 through the connecting pipe 55 and the electric valve 54. On the other hand, the third hot air hood 53 is also connected to the air inlet of the fourth stage of the annular cooler 5 through the connecting pipe 55 and the conveying fan 56. The hot air (with a temperature below 90 degrees Celsius) in the third hot air hood 53 enters the second air supply pipe 12 through the connecting pipe 55 and the electric valve 54 when the electric valve 54 is opened. When the electric valve 54 is closed, it enters the fourth stage of the annular cooler 5 through the conveying fan 56 for reheating to increase the temperature of the air output from the first air hood.

[0031] Understandably, when drying the lump ore in the ore bin body 21, the hot air from the fourth stage of the annular cooler 5 is transported to the first drying component 22 through the first air supply pipe 11 and the first fan 13. The first drying component 22 blows hot air onto the ore in the ore bin body 21 for drying. The hot air from the fifth stage of the annular cooler 5 is transported to the second drying component 23 through the second air supply pipe 12 and the second fan 14. The second drying component 23 blows hot air onto the ore in the ore bin body 21 for drying. It can be known that the temperature of the hot air output from the fourth stage of the annular cooler 5 is higher than that of the hot air output from the fifth stage of the annular cooler 5. Therefore, the temperature of the hot air transported to the first drying component 22 through the first air supply pipe 11 and the first fan 13 is higher than that of the hot air transported to the second drying component 23 through the second air supply pipe 12 and the second fan 14. The advantage of such an arrangement is that when the second drying component 23 sprays hot air into the ore bin body 21, as the hot air rises, the water vapor in the ore bin body 21 also rises. When it reaches the first drying component 22, the water vapor absorbs heat under the action of the first drying component 22, preventing the water vapor from condensing and dew-forming in the upper part of the ore bin body 21, so that the subsequent dust removal work can proceed smoothly.

[0032] Furthermore, the second drying component 23 includes an air supply pipe 231, a ring pipe 232, and a nozzle 233. The first end of the air supply pipe 231 is connected to the second air supply pipe 12, the second end of the air supply pipe 231 is connected to the ring pipe 232, the ring pipe 232 is arranged around the outer periphery of the ore bin body 21, the first end of the nozzle 233 is connected to the ring pipe 232, and the second end of the nozzle 233 penetrates the outer wall of the ore bin body 21 and extends into the ore bin body 21 for arrangement.

[0033] Understandably, the hot air of the annular cooler 5 is transported to the air supply pipe 231 through the second air supply pipe 12 and then transported to the ring pipe 232. The hot air in the ring pipe 232 is then sprayed into the ore bin body 21 through the nozzle 233. The hot air will heat the lump ore in the ore bin body 21 and take away the moisture in the lump ore, thereby realizing the drying of the lump ore in the ore bin body 21.

[0034] Furthermore, a plurality of nozzles 233 are arranged, and the plurality of nozzles 233 are evenly distributed along the circumferential direction of the ore bin body 21, and the spray ports of each nozzle 233 are arranged obliquely upward from the outside to the inside.

[0035] Understandably, drying the lump ore in the ore bin body 21 through a plurality of nozzles 233 at the same time, on the one hand, increases the spraying area, making it easier to dry the lump ore; on the other hand, evenly sprays the lump ore in the ore bin body 21 from all directions, making the drying of the lump ore more uniform. The oblique upward arrangement of the nozzles 233 is beneficial for the hot air after spraying to move towards the upper part of the ore bin body 21.

[0036] Furthermore, it further includes a first dust removal mechanism 3. The first dust removal mechanism 3 is located downstream of the drying mechanism 2. The first dust removal mechanism 3 includes a gas collecting hood 31, an annular skirt plate 32, a sealing curtain 33, a first barrier net 34, and a second barrier net 35. The sealing curtain 33, the annular skirt plate 32, and the gas collecting hood 31 are arranged in sequence from bottom to top. The first barrier net 34 and the second barrier net 35 are arranged inside the annular skirt plate 32. The first barrier net 34 is located above the second barrier net 35, and the diameter of the mesh holes in the first barrier net 34 is smaller than the diameter of the mesh holes in the second barrier net 35. The lower part of the gas collecting hood 31 is communicated with the inside of the ore bin body 21 through the annular skirt plate 32 and the sealing curtain 33. A gas collecting outlet is arranged at the top of the gas collecting hood 31.

[0037] Specifically, the first dust removal mechanism 3 is located in the upper part of the ore bin body 21. The waste gas with water vapor and dust flowing out from the upper outlet of the ore bin body 21 enters the first dust removal mechanism 3 upward for preliminary dust removal. The sealing curtain 33 is connected to the top of the ore bin body 21, so that the waste gas with water vapor and dust discharged upward in the ore bin body 21 directly enters the annular skirt plate 32 and the gas collecting hood 31 through the sealing curtain 33.

[0038] It can be understood that the waste gas with water vapor and dust in the ore bin body 21 moves upward and is blocked by the first barrier net and the second barrier net, and the larger-particle dust in the waste gas with water vapor and dust is filtered, so that the larger-particle dust cannot pass through the first barrier net and the second barrier net, realizing the preliminary treatment of the waste gas with water vapor and dust. And during the treatment process, the dust particles blocked by the first barrier net are larger than the dust particles blocked by the second barrier net, so that the salt particles blocked by the second barrier net can pass through the mesh holes of the first barrier net during the falling process, and the dust blocked by the first barrier net and the second barrier net can smoothly fall into the ore bin body 21. On the one hand, it reduces the dust removal pressure of the subsequent dust removal mechanism, and on the other hand, it prevents large-particle ore blocks from being blown away as dust, resulting in waste of ore.

[0039] Furthermore, the first dust removal mechanism 3 further includes a first vibration motor 36 and a second vibration motor 37. The first vibration motor 36 and the second vibration motor 37 are both arranged outside the annular skirt plate 32. First extension plates are arranged at both ends of the first barrier net 34, and the first extension plates extend out of the annular skirt plate 32. The first vibration motor 36 is fixed on the first extension plate. Second extension plates are arranged at both ends of the second barrier net 35, and the second extension plates extend out of the annular skirt plate 32. The second vibration motor 37 is installed on the second extension plate.

[0040] Understandably, when the soot particles in the waste gas with water vapor and soot are blocked by the first blocking net, most of the soot particles will adhere to the first blocking net. The first vibration motor 36 and the first extension plate are used to vibrate the first blocking net, so that the soot particles adhering to the first blocking net fall back into the ore tank body 21, preventing these soot particles from interfering with the normal filtration of the first blocking net. The functions of the second vibration motor 37 and the second extension plate are the same as those of the first vibration motor 36 and the first extension plate.

[0041] Furthermore, a second dust removal mechanism 4 is further included. The second dust removal mechanism 4 is arranged at the downstream end of the first dust removal mechanism 3 and is communicated with the first dust removal mechanism 3. The second dust removal mechanism 4 includes a housing 41, a partition plate 42 and a heating component 43. The partition plate 42 is horizontally arranged in the housing 41, separating a dust removal chamber 411 located in the upper part and an ash collection chamber 412 located in the lower part. The heating component 43 is arranged on the partition plate 42, and the dust removal chamber 411 is arranged around the heating component 43. The second dust removal mechanism 4 further includes a dust removal net 44, and the dust removal net 44 is arranged in the dust removal chamber 411. An air inlet 413 and an air outlet 414 are arranged on the housing 41. The air inlet 413 is communicated with the lower part of the dust removal chamber 411, and the air inlet 413 is communicated with the gas collection outlet of the first dust removal mechanism 3. The air outlet 414 is communicated with the upper part of the dust removal chamber 411. A dust leakage hole 421 is provided on the partition plate 42. The upper end of the dust leakage hole 421 is communicated with the ash collection chamber 412, and the lower end of the dust leakage hole 421 is communicated with the ash collection chamber 412. A dust cleaning hole 415 is arranged at the bottom of the housing 41, and the dust cleaning hole 415 is communicated with the ash collection chamber 412.

[0042] Understandably, the waste gas preliminarily purified by the first dust removal mechanism 3 enters the dust removal chamber 411 of the second dust removal mechanism 4 for secondary dust removal. The preliminarily purified waste gas enters through the air inlet 413 and passes through the dust removal net 44. The soot particles in the waste gas are blocked by the dust removal net 44 and fall into the ash collection chamber 412 through the dust leakage hole 421 on the partition plate 42 for collection, achieving the effect of dust removal. The waste gas that is purified again finally exits through the air outlet 414. During the purification process, the heating component 43 heats the waste gas in the dust removal chamber 411 to prevent the waste gas in the dust removal chamber 411 from condensing, because condensation is likely to cause the wet soot to block the dust removal net 44, affecting the dust removal effect.

[0043] Further, the heating component 43 includes a conical cylinder 431, a gas pipe 432, an air supply pipe 433, and an igniter 434. The conical cylinder 431 is vertically arranged above the partition plate 42, and the small end of the conical cylinder 431 faces upward. The small end of the conical cylinder 431 is fixedly connected to the inner wall of the housing 41, and the large end of the conical cylinder 431 is fixedly connected to the housing 41. The partition plate 42, the conical cylinder 431, and the housing 41 enclose a combustion chamber 435. The igniter 434 is arranged at the bottom of the combustion chamber 435. Both the gas pipe 432 and the air supply pipe 433 communicate with the bottom of the combustion chamber 435, and the outlets of the gas pipe 432 and the air supply pipe 433 both face the igniter 434. An exhaust port 436 is arranged at the top of the combustion chamber 435.

[0044] It can be understood that gas is introduced through the gas pipe 432, and oxygen or air is introduced through the air supply pipe 433. Under the action of the igniter 434, the gas introduced into the combustion chamber 435 burns to heat the conical cylinder 431. The conical cylinder 431 heats the waste gas in the dust removal chamber 411 by heat conduction, preventing the waste gas in the dust removal chamber 411 from condensing, so that the secondary dust removal can proceed smoothly. The waste gas after the gas combustion is discharged through the exhaust port 436, and is externally connected to the blast furnace flue gas purification system 8 for purifying the waste gas. In addition, it should be noted that in the actual production process, the waste gas after the secondary dust removal also needs to pass through a bag filter 9 for dust removal and then be discharged through a chimney 10.

[0045] Further, a plurality of dust removal nets 44 are arranged, and the plurality of dust removal nets 44 are distributed up and down. From top to bottom, the mesh holes on different dust removal nets 44 increase in sequence.

[0046] It can be understood that the waste gas moves upward from the lower part. Therefore, the dust in the waste gas will first contact the lowermost dust removal net 44 and be filtered by the lowermost dust removal net 44. As the waste gas continues to move upward, it is successively filtered by other dust removal nets 44 above. During the filtering process, the dust particles filtered by the lowermost dust removal net 44 are the largest, and from bottom to top, the dust particles filtered by each dust removal net 44 gradually decrease. The advantage of such an arrangement is that the dust is filtered step by step, and after filtering, the smaller dust particles filtered by the upper dust removal net 44 can conveniently pass through the lower dust removal net 44, and the filtered dust can smoothly move downward into the ash collection chamber 412 for storage.

[0047] Further, the dust removal net 44 is in the shape of a frustum of a cone, and the end with a smaller diameter of the dust removal net 44 faces downward; a dust chute 4311 is arranged on the outer periphery of the conical cylinder 431, and the dust chute 4311 is arranged along the generatrix direction of the conical cylinder 431.

[0048] Understandably, the soot blocked by the dust removal net 44 will move along the dust removal net 44 to the outer wall of the conical cylinder 431, and then move downward along the ash chute 4311 to the partition plate 42, and finally leak from the ash leakage hole 421 on the partition plate 42 and move into the ash collection cavity 412 for collection.

[0049] Furthermore, the second dust removal mechanism 4 further includes a heat preservation layer 45, and the heat preservation layer 45 is wrapped outside the housing 41.

[0050] Understandably, by arranging the heat preservation layer 45 outside the housing 41, the heat dissipation inside the housing 41 can be effectively reduced, preventing the waste gas in the housing 41 from condensing after encountering cold, which may lead to poor dust removal effect.

[0051] The working principle of applying this embodiment is as follows: The hot air in the upper part of the fourth stage of the annular cooler 5 is transported to the first drying component 22 through the first air supply pipe 11 and the first fan 13. The first drying component 22 sprays hot air into the inside of the ore bin body 21 to dry the lump ore in the ore bin body 21. The hot air in the fifth stage of the annular cooler 5 is transported to the second drying component 23 through the second air supply pipe 12 and the second fan 14. The second drying component 23 sprays hot air towards the ore lumps in the ore bin body 21. The actual function of the second drying component 23 is to dry the lump ore in the ore bin body 21, while the first drying component 22 is used not only to dry the ore lumps in the lump ore body but also to provide heat for the water vapor in the flue gas generated by drying to prevent the water vapor from condensing at the top of the ore bin body 21. Therefore, the temperature of the hot air in the second drying component 23 needs to be higher than that of the first drying component 22 and higher than 100 degrees Celsius. The heat in the fifth stage of the annular cooler 5 is connected to the inlet of the fourth stage of the annular cooler 5 through the connecting pipe 55, and an electric valve 54 is arranged between the connecting pipe 55 and the second air supply pipe 12. When the hot air in the first air supply pipe 11 can reach the temperature requirement, the electric valve 54 opens, so that more hot air is blown into the second air supply pipe 12 to accelerate the drying speed of the lump ore in the ore bin body 21; when the hot air in the first air supply pipe 11 cannot reach the temperature requirement, the electric valve 54 closes, so that part of the hot air in the fifth stage of the annular cooler 5 enters from the fourth stage of the annular cooler 5 and is reheated through the fourth stage of the annular cooler 5 to increase the outlet air temperature of the fourth stage of the annular cooler 5, that is, to increase the temperature of the hot air in the first air supply pipe 11, so that the temperature of the hot air in the first air supply pipe 11 can reach the use requirement. The waste gas generated by drying the lump ore is output from the top of the ore bin body 21, and is sequentially subjected to dust removal treatment by the first dust removal mechanism 3 and the second dust removal mechanism 4, and then finally subjected to dust removal treatment by the bag filter 9 and discharged into the atmosphere through the chimney 10.

[0052] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A lump ore drying system, characterized in that: It includes an air supply mechanism (1) and a drying mechanism (2), The air supply mechanism (1) includes a first air supply pipe (11), a second air supply pipe (12), a first fan (13) and a second fan (14). The first fan (13) is installed on the first air supply pipe (11), and the second fan (14) is installed on the second air supply pipe (12); The drying mechanism (2) includes a ore trough body (21), a first drying component (22) and a second drying component (23). The nozzle end of the first drying component (22) extends into the ore trough body (21) for arrangement, and the nozzle end of the second drying component (23) also extends into the ore trough body (21) for arrangement. The first air supply pipe (11) is communicated with the first drying component (22), the second air supply pipe (12) is communicated with the second drying component (23), and the first drying component (22) is located above the second drying component (23).

2. The lump ore drying system according to claim 1, characterized in that: The second drying component (23) includes an air supply pipe (231), a ring pipe (232) and a nozzle (233). The first end of the air supply pipe (231) is communicated with the second air supply pipe (12), the second end of the air supply pipe (231) is communicated with the ring pipe (232), the ring pipe (232) is arranged around the outer periphery of the ore trough body (21), the first end of the nozzle (233) is communicated with the ring pipe (232), and the second end of the nozzle (233) penetrates the outer wall of the ore trough body (21) and extends into the ore trough body (21) for arrangement.

3. The lump ore drying system according to claim 2, characterized in that: A plurality of nozzles (233) are arranged, and the plurality of nozzles (233) are circumferentially distributed along the ore trough body (21), and the nozzle of each nozzle (233) is arranged to incline upward in the direction from outside to inside.

4. The lump ore drying system according to claim 1, characterized in that: It further includes a first dust removal mechanism (3), and the first dust removal mechanism (3) is located downstream of the drying mechanism (2), The first dust removal mechanism (3) includes a gas collection hood (31), an annular skirt plate (32), a sealing curtain (33), a first screen (34) and a second screen (35). The sealing curtain (33), the annular skirt plate (32) and the gas collection hood (31) are arranged in sequence from bottom to top. The first screen (34) and the second screen (35) are arranged inside the annular skirt plate (32). The first screen (34) is located above the second screen (35), and the diameter of the mesh holes on the first screen (34) is smaller than the diameter of the mesh holes on the second screen (35); the lower part of the gas collection hood (31) is communicated with the inside of the ore trough body (21) through the annular skirt plate (32) and the sealing curtain (33), and a gas collection outlet is arranged at the top of the gas collection hood (31).

5. The lump ore drying system according to claim 4, characterized in that: The first dust removal mechanism (3) further includes a first vibration motor (36) and a second vibration motor (37). Both the first vibration motor (36) and the second vibration motor (37) are arranged outside the annular skirt plate (32). Both ends of the first screen (34) are provided with first extension plates, and the first extension plates extend out of the annular skirt plate (32). The first vibration motor (36) is fixed on the first extension plate. Both ends of the second screen (35) are provided with second extension plates, and the second extension plates extend out of the annular skirt plate (32). The second vibration motor (37) is installed on the second extension plate.

6. The lump ore drying system according to claim 4, wherein: It further includes a second dust removal mechanism (4). The second dust removal mechanism (4) is arranged at the downstream end of the first dust removal mechanism (3) and is communicated with the first dust removal mechanism (3). The second dust removal mechanism (4) includes a housing (41), a partition plate (42) and a heating component (43). The partition plate (42) is horizontally arranged in the housing (41), separating a dust removal chamber (411) located in the upper part and an ash collection chamber (412) located in the lower part. The heating component (43) is arranged on the partition plate (42), and the dust removal chamber (411) is arranged around the heating component (43). The second dust removal mechanism (4) further includes a dust removal net (44). The dust removal net (44) is arranged in the dust removal chamber (411). An air inlet (413) and an air outlet (414) are arranged on the housing (41). The air inlet (413) is communicated with the lower part of the dust removal chamber (411), and the air inlet (413) is communicated with the gas collection outlet of the first dust removal mechanism (3). The air outlet (414) is communicated with the upper part of the dust removal chamber (411). The partition plate (42) is provided with ash leakage holes (421). The upper end of the ash leakage holes (421) is communicated with the ash collection chamber (412), and the lower end of the ash leakage holes (421) is communicated with the ash collection chamber (412). A dust cleaning hole (415) is arranged at the bottom of the housing (41). The dust cleaning hole (415) is communicated with the ash collection chamber (412).

7. The lump ore drying system according to claim 6, wherein: The heating component (43) includes a conical cylinder (431), a gas pipe (432), an air supply pipe (433), and an igniter (434). The conical cylinder (431) is vertically arranged above the partition plate (42), and the small end of the conical cylinder (431) faces upward. The small end of the conical cylinder (431) is fixedly connected to the inner wall of the housing (41), and the large end of the conical cylinder (431) is fixedly connected to the housing (41). The partition plate (42), the conical cylinder (431), and the housing (41) enclose a combustion chamber (435). The igniter (434) is arranged at the bottom of the combustion chamber (435). The gas pipe (432) and the air supply pipe (433) are both communicated with the bottom of the combustion chamber (435), and the outlets of the gas pipe (432) and the air supply pipe (433) both face the igniter (434). An exhaust port (436) is arranged at the top of the combustion chamber (435).

8. The lump ore drying system according to claim 6, wherein: A plurality of dust removal nets (44) are arranged, and the plurality of dust removal nets (44) are distributed vertically. From top to bottom, the mesh holes of different dust removal nets (44) increase in sequence.

9. The lump ore drying system according to claim 7, wherein: The dust removal net (44) is frustum-shaped, and the end with a smaller diameter of the dust removal net (44) faces downward; a dust chute (4311) is arranged on the outer periphery of the conical cylinder (431), and the dust chute (4311) is arranged along the generatrix direction of the conical cylinder (431).

10. The lump ore drying system according to claim 6, wherein: The second dust removal mechanism (4) further includes a heat preservation layer (45), and the heat preservation layer (45) is wrapped outside the housing (41).

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