Integrated roasting and staged cooling system

Abstract

The utility model provides a kind of comprehensive roasting grading cooling system, which comprises a balling device, a rotary kiln, a grading cooling device and a dry cooling device. The grading cooling device includes a grate, a hopper and a cooling pool. The discharge port of the balling device is connected to the feed inlet of the rotary kiln. The discharge port of the rotary kiln is located above the feed inlet of the hopper, and the grate is located between the discharge port of the rotary kiln and the feed inlet of the hopper. The coarse material outlet of the grate is connected to the cooling pool, and the fine material outlet of the grate is connected to the feed inlet of the hopper. The discharge port of the hopper is connected to the feed inlet of the dry cooling device. The utility model sets a grading cooling device and a dry cooling device downstream of the rotary kiln, grades and dry-cools the slag, improves the on-site environment and transportation conditions, and achieves the purpose of meeting the comprehensive utilization requirements of the slag.

Description

Technical Field

[0001] This utility model relates to a cooling system, specifically a comprehensive roasting and grading cooling system, and belongs to the field of metallurgical technology. Background Technology

[0002] Various zinc- and iron-containing dust and sludge from the steel industry, including sintering dust, blast furnace bag filter dust, blast furnace gravity dust, electric furnace dust, steelmaking sludge, and converter dust, have high valuable metal content and high recycling value. Their main chemical components include Fe, Zn, C, Ca, Mg, Si, and Al. Fe and C are the main materials and energy components in steelmaking, while Ca and Mg are solvent components and can be recycled and reused in the steelmaking process. However, these dust and sludge generally have high zinc content. Zinc is a harmful element in the steelmaking process, so it is not suitable as a direct raw material. The main reason is that zinc is easily reduced during blast furnace smelting; its boiling point is low (907℃), it is insoluble in molten iron, and it easily volatilizes. Under high temperatures inside the furnace, zinc vapor combines with oxygen in the flue gas and is oxidized to ZnO. Some ZnO deposits on the upper furnace wall, forming furnace nodules, while some seeps into the pores and brick joints of the furnace lining, causing the lining to expand and damage it. Therefore, the zinc load in blast furnace burdens is limited. As sinter is the main blast furnace burden, its zinc content should be minimized to avoid adverse effects on blast furnace operation. If zinc-containing dust is directly added to the sintering mix, it cannot be effectively removed under the oxidizing atmosphere of the sintering process and will remain in the sinter. When it enters the blast furnace with the sinter, it will inevitably cause zinc enrichment within the blast furnace, affecting its smooth operation. Therefore, pre-dezincification of zinc-containing dust and sludge before it is added to the sintering mix is ​​essential in steel plants.

[0003] The pretreatment of zinc-containing dust and sludge for zinc removal employs a rotary kiln process. After mixing and pelletizing, the slag undergoes high-temperature roasting in the rotary kiln. The slag falls from the kiln head outlet and enters the slag treatment process. Water quenching is commonly used in the slag treatment process. High-temperature slag falls from the kiln into a slag flushing chute, is then flushed into a slag flushing pool, and is retrieved using a crane grab bucket. This water quenching method can quickly cool the blast furnace slag, resulting in significant slag cooling. However, its disadvantages are also obvious: ① The slag has a high moisture content, making transportation difficult and creating a poor working environment along the way. If the slag is utilized, it cannot meet the dry slag requirements of subsequent processes; ② It generates a large amount of water vapor, resulting in a poor on-site environment and high water consumption; ③ The water in the quenching pool is difficult to treat, requiring the use of sedimentation and clarification tanks for recycling, which necessitates a large footprint and extensive civil engineering work; ④ The waste heat from the slag cannot be utilized; ⑤ The slag is not particle size-classified, which may lead to blockages in subsequent processes. Utility Model Content

[0004] To address the problems of high slag moisture content, poor working environment, inability to meet the requirements of subsequent processes, and lack of slag grading in existing water-quenched slag removal technologies, this utility model proposes a comprehensive roasting, grading, and cooling system. The slag is graded immediately after being discharged from the rotary kiln, avoiding blockage of subsequent devices. Furthermore, dry cooling improves the on-site environment and transportation conditions, thereby meeting the requirements for comprehensive utilization of slag.

[0005] According to the embodiments of this utility model, a comprehensive roasting and grading cooling system is provided.

[0006] A comprehensive roasting and grading cooling system includes a pelletizing unit, a rotary kiln, a grading cooling unit, and a dry cooling unit. The grading cooling unit includes a grate, a hopper, and a cooling pool. The outlet of the pelletizing unit is connected to the inlet of the rotary kiln. The outlet of the rotary kiln is located above the inlet of the hopper, and the grate is located between the outlet of the rotary kiln and the inlet of the hopper. The coarse material outlet of the grate is connected to the cooling pool, and the fine material outlet of the grate is connected to the inlet of the hopper. The outlet of the hopper is connected to the inlet of the dry cooling unit.

[0007] Preferably, the grid comprises multiple grid bars arranged in the same plane, with a gap between any two adjacent grid bars. Each grid bar has an inner cavity, and a grid bar cooling medium inlet and a grid bar cooling medium outlet communicating with the inner cavity are provided on the grid bar. The grid bar cooling medium inlet is connected to a cooling medium source.

[0008] Preferably, the hopper wall has a sandwiched chamber on its side, with a hopper cooling medium inlet and a hopper cooling medium outlet on the sandwiched chamber. The hopper cooling medium inlet is connected to a cooling medium source. Preferably, the hopper cooling medium inlet is located at the lower end of the sandwiched chamber, and the hopper cooling medium outlet is located at the upper end of the sandwiched chamber. Preferably, the hopper cooling medium outlet is connected to the grid cooling medium inlet.

[0009] Preferably, the bar grid is inclined and its rotation direction and angle are adjustable. The adjustable rotation direction and angle can be achieved by setting the bar grid on the ground or hopper via a connecting rod, and then using a rotatable connecting structure (e.g., bearing, pin) between the connecting rod and the bar grid to allow free rotation. Alternatively, free rotation of the bar grid can be achieved using any other existing technology.

[0010] Preferably, the dry cooling device includes a horizontally arranged cylindrical outer shell and an inner shell. The inner shell is coaxially fitted inside the outer shell. A sandwich chamber is formed between the outer wall of the inner shell and the inner wall of the outer shell, and the sandwich chamber has a sandwich cooling medium inlet and a sandwich cooling medium outlet. Preferably, both the sandwich cooling medium inlet and outlet of the sandwich chamber are located at the discharge end of the inner shell.

[0011] Preferably, a cooling pipe extending axially is also provided along the inner wall of the inner shell. The cooling medium inlet of the cooling pipe is connected to the cooling medium outlet of the interlayer, and the cooling medium outlet of the cooling pipe is connected to the outside. Preferably, the cooling pipe is arranged in a spiral shape extending circumferentially along the inner wall of the inner shell.

[0012] Preferably, the cooling medium inlet of the cooling pipe is located at the feed end of the inner shell, and the cooling medium inlet is connected to the cooling medium outlet of the interlayer. The cooling medium outlet of the cooling pipe is located at the discharge end of the inner shell.

[0013] Preferably, a guide vane is fixedly or movably installed on the cooling pipe, protruding towards the interior of the inner shell and extending along the length of the cooling pipe.

[0014] Preferably, the dry cooling device further includes a feeding mechanism. The feeding mechanism includes a feeding pipe, the discharge end of which is connected to the inlet end of the inner shell, and the inlet end of the feeding pipe is connected to the outlet of the hopper. Preferably, the feeding mechanism further includes a frequency detector and a vibrator disposed on the wall of the feeding pipe, the frequency detector and the vibrator being connected via signal transmission. Preferably, the frequency detector is also connected to an alarm. Preferably, a dust cleaner is also provided on the inner wall of the feeding pipe.

[0015] Preferably, the dry cooling device further includes a screening mechanism. The screening mechanism includes a screen cylinder. The inlet of the screen cylinder is connected to the outlet of the inner shell, and the screen cylinder is provided with a large particle material outlet and a small particle material outlet. Preferably, the screening mechanism further includes a gravity flap gate. The gravity flap gate is located at the large particle material outlet of the screen cylinder.

[0016] Preferably, the system also includes a waste heat boiler. The flue gas outlet of the rotary kiln is connected to the heat source inlet of the waste heat boiler.

[0017] Preferably, the system also includes a flue gas purification device. The heat source outlet of the waste heat boiler is connected to the flue gas inlet of the flue gas purification device.

[0018] Preferably, the system further includes a multi-stage media utilization device, which is a deaerator. The liquid inlet of the deaerator is connected to the hopper cooling medium outlet and / or the grid cooling medium outlet and / or the pipeline cooling medium outlet.

[0019] Preferably, the liquid outlet of the deaerator is connected to the evaporator inlet of the waste heat boiler.

[0020] In this invention, after the slag is discharged from the rotary kiln, it is immediately graded by a grading and cooling device and then sent to a dry cooling device for further cooling. This prevents blockage of subsequent devices and improves the on-site environment and transportation conditions, thus meeting the requirements for comprehensive utilization of the slag. Preferably, an inner cavity is formed inside the grid bars that make up the grid, and a cooling medium is introduced into it to achieve the purpose of slag screening and cooling. In addition, since high-temperature slag may adhere to the surface of the pipes, eventually leading to blockage, introducing a cooling medium can also reduce the temperature of the contact surface between the slag and the pipes, reducing the probability of blockage. Furthermore, a jacketed chamber is formed on the side of the hopper wall, and a cooling medium is introduced to reduce the possibility of slag adhering to the hopper wall. Moreover, the total cooling medium in the jacketed chamber can be introduced into the inner cavity of the grid bars to achieve full utilization of the medium.

[0021] In this invention, since the rotation of the rotary kiln causes the material within it to shift to one side, this design tilts the bar grid to concentrate the discharge from the rotary kiln onto the bar grid as much as possible, while also extending the material screening distance. In practical applications, the rotation direction of the rotary kiln may change, and the direction of the higher side of the bar grid aligns with the direction of material movement caused by the rotation of the rotary kiln. Therefore, this design makes the rotation direction and angle of the bar grid adjustable.

[0022] In this invention, a sandwich chamber is provided between the outer shell and the inner shell of the dry cooling device, and a cooling medium is introduced into the sandwich chamber to achieve dry cooling, reduce the moisture content of the slag, improve the working environment, and enable the dried slag to meet the requirements of subsequent processes.

[0023] In this invention, cooling pipes are axially arranged along the inner wall of the inner shell to increase the area for indirect heat exchange between the cooling medium and the material. Preferably, the cooling pipes are spiral-shaped, so that during the rotation of the cylinder, the cooling pipes, along with the cylinder, propel the material towards the rear. Furthermore, the cooling medium inlet of the pipes is connected to the cooling medium outlet of the jacket, making full use of the cooling medium. Guide vanes can also be installed on the cooling pipes to accelerate the movement speed of the material.

[0024] In this invention, a frequency detector and a vibrator can also be installed on the feed pipe. When the frequency detector detects an abnormality in the inherent frequency of the equipment, it indicates that there may be material adhering or blocking the feed pipe, and the vibrator is activated to clean the material in the feed pipe. Furthermore, an alarm is installed. When the frequency detector detects an abnormality in the inherent frequency of the equipment, the alarm is activated to prompt manual cleaning or cleaning via a dust remover.

[0025] In this invention, a multi-stage medium utilization device is further provided to recover the cooling medium discharged from the hopper cooling medium outlet and / or the grid cooling medium outlet and / or the pipeline cooling medium outlet, and send it to the waste heat boiler for evaporation and reuse.

[0026] In this invention, the discharge port of the pelletizing device and the feed port of the rotary kiln are connected by a belt conveyor or other material conveying equipment.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention provides a comprehensive roasting and grading cooling system, which sets up a grading cooling device and a dry cooling device downstream of the rotary kiln to grade and dry cool the slag, improve the on-site environment and transportation conditions, and achieve the purpose of meeting the comprehensive utilization needs of slag.

[0029] 2. The present invention provides a comprehensive roasting and grading cooling system, which introduces cooling media into the space through the jacketed chamber of the hopper and the inner cavity of the grid bar, thereby reducing the temperature of the contact surface between the slag and the pipeline, reducing the probability of blockage, reducing the moisture content of the slag, improving the working environment, and enabling the dried slag to meet the requirements of subsequent processes. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a comprehensive roasting and grading cooling system provided by this utility model.

[0031] Figure 2 The front view of the graded cooling device in a comprehensive roasting and grading cooling system provided by this utility model.

[0032] Figure 3 A side view of a graded cooling device in a comprehensive roasting and grading cooling system provided by this utility model.

[0033] Figure 4 This is a schematic diagram of the structure of the grid in a comprehensive roasting and grading cooling system provided by this utility model.

[0034] Figure 5 This is a schematic diagram of the dry cooling device in a comprehensive roasting and grading cooling system provided by this utility model.

[0035] Figure 6 A cross-sectional view of a dry cooling device in a comprehensive roasting and grading cooling system provided by this utility model.

[0036] Reference numerals in the attached drawings: 1: Pelletizing device; 2: Rotary kiln; 3: Staged cooling device; 31: Bar grid; 311: Grid bar; 32: Hopper; 33: Cooling pool; 4: Dry cooling device; 41: Outer shell; 42: Inner shell; 43: Cooling pipe; 44: Feeding mechanism; 441: Feed pipe; 442: Ash remover; 45: Screening mechanism; 451: Screen cylinder; 452: Gravity flap door; 5: Waste heat boiler; 6: Flue gas purification device; 7: Multi-stage media utilization device. Detailed Implementation

[0037] The technical solution of the present invention will be illustrated below with examples. The scope of protection sought by the present invention includes, but is not limited to, the following embodiments.

[0038] According to the embodiments of this utility model, a comprehensive roasting and grading cooling system is provided.

[0039] A comprehensive roasting and grading cooling system includes a pelletizing device 1, a rotary kiln 2, a grading cooling device 3, and a dry cooling device 4. The grading cooling device 3 includes a grid 31, a hopper 32, and a cooling pool 33. The outlet of the pelletizing device 1 is connected to the inlet of the rotary kiln 2. The outlet of the rotary kiln 2 is located above the inlet of the hopper 32, and the grid 31 is located between the outlet of the rotary kiln 2 and the inlet of the hopper 32. The coarse material outlet of the grid 31 is connected to the cooling pool 33, and the fine material outlet of the grid 31 is connected to the inlet of the hopper 32. The outlet of the hopper 32 is connected to the inlet of the dry cooling device 4.

[0040] Preferably, the grid 31 includes multiple grid bars 311 arranged in the same plane, and a gap is left between any two adjacent grid bars 311. Each grid bar 311 has an inner cavity, and a grid bar cooling medium inlet and a grid bar cooling medium outlet communicating with the inner cavity are formed on the grid bar 311. The grid bar cooling medium inlet is connected to a cooling medium source.

[0041] Preferably, the hopper 32 has a sandwiched chamber on its side wall, with a hopper cooling medium inlet and a hopper cooling medium outlet on the sandwiched chamber. The hopper cooling medium inlet is connected to a cooling medium source. Preferably, the hopper cooling medium inlet is located at the lower end of the sandwiched chamber, and the hopper cooling medium outlet is located at the upper end of the sandwiched chamber. Preferably, the hopper cooling medium outlet is connected to the grid cooling medium inlet.

[0042] Preferably, the strip 31 is inclined and the rotation direction and angle of the strip 31 are adjustable.

[0043] Preferably, the dry cooling device 4 includes a horizontally arranged cylindrical outer shell 41 and an inner shell 42. The inner shell 42 is coaxially fitted inside the outer shell 41. A sandwich chamber is formed between the outer side wall of the inner shell 42 and the inner side wall of the outer shell 41, and the sandwich chamber has a sandwich cooling medium inlet and a sandwich cooling medium outlet. Preferably, both the sandwich cooling medium inlet and the sandwich cooling medium outlet are located at the discharge end of the inner shell 42.

[0044] Preferably, a cooling pipe 43 extending axially is also provided along the inner sidewall of the inner shell 42. The cooling medium inlet of the cooling pipe 43 is connected to the cooling medium outlet of the interlayer, and the cooling medium outlet of the cooling pipe 43 is connected to the outside. Preferably, the cooling pipe 43 is arranged in a spiral shape extending circumferentially along the inner sidewall of the inner shell 42.

[0045] Preferably, the cooling medium inlet of the cooling pipe 43 is located at the feed end of the inner shell 42, and the cooling medium inlet is connected to the cooling medium outlet of the interlayer. The cooling medium outlet of the cooling pipe 43 is located at the discharge end of the inner shell 42.

[0046] Preferably, a guide vane is fixedly or movably provided on the cooling pipe 43, protruding inward toward the inner shell 42 and extending along the length of the cooling pipe 43.

[0047] Preferably, the dry cooling device 4 further includes a feeding mechanism 44. The feeding mechanism 44 includes a feeding pipe 441, the discharge end of which is connected to the inlet end of the inner shell 42, and the inlet end of the feeding pipe 441 is connected to the outlet of the hopper 32. Preferably, the feeding mechanism 44 further includes a frequency detector and a vibrator disposed on the wall of the feeding pipe 441, the frequency detector and the vibrator being connected via signal transmission. Preferably, the frequency detector is also connected to an alarm. Preferably, a dust remover 442 is also provided on the inner wall of the feeding pipe 441.

[0048] Preferably, the dry cooling device 4 further includes a screening mechanism 45. The screening mechanism 45 includes a screen cylinder 451. The inlet of the screen cylinder 451 is connected to the outlet of the inner shell 42, and the screen cylinder 451 is provided with a large particle material outlet and a small particle material outlet. Preferably, the screening mechanism 45 further includes a gravity flap door 452. The gravity flap door 452 is located at the large particle material outlet of the screen cylinder 451.

[0049] Preferably, the system also includes a waste heat boiler 5. The flue gas outlet of the rotary kiln 2 is connected to the heat source inlet of the waste heat boiler 5.

[0050] Preferably, the system also includes a flue gas purification device 6. The heat source outlet of the waste heat boiler 5 is connected to the flue gas inlet of the flue gas purification device 6.

[0051] Preferably, the system further includes a multi-stage media utilization device 7. The multi-stage media utilization device 7 is a deaerator. The liquid inlet of the deaerator is connected to the hopper cooling medium outlet and / or the grid cooling medium outlet and / or the pipeline cooling medium outlet.

[0052] Preferably, the liquid outlet of the deaerator 71 is connected to the evaporator inlet of the waste heat boiler 5.

[0053] Example 1

[0054] A comprehensive roasting and grading cooling system includes a pelletizing device 1, a rotary kiln 2, a grading cooling device 3, and a dry cooling device 4. The grading cooling device 3 includes a grid 31, a hopper 32, and a cooling pool 33. The outlet of the pelletizing device 1 is connected to the inlet of the rotary kiln 2. The outlet of the rotary kiln 2 is located above the inlet of the hopper 32, and the grid 31 is located between the outlet of the rotary kiln 2 and the inlet of the hopper 32. The coarse material outlet of the grid 31 is connected to the cooling pool 33, and the fine material outlet of the grid 31 is connected to the inlet of the hopper 32. The outlet of the hopper 32 is connected to the inlet of the dry cooling device 4.

[0055] Example 2

[0056] The embodiment 1 is repeated, except that the grid 31 includes 8 grid bars 311 arranged in the same plane, and there is a gap between any two adjacent grid bars 311. The grid bar 311 has an inner cavity, and a grid bar cooling medium inlet and a grid bar cooling medium outlet communicating with the inner cavity are formed on the grid bar 311. The grid bar cooling medium inlet is connected to the cooling medium source.

[0057] Example 2

[0058] The embodiment 1 is repeated, except that a sandwich chamber is formed on the side of the hopper wall of the hopper 32. A hopper cooling medium inlet and a hopper cooling medium outlet are formed in the sandwich chamber. The hopper cooling medium inlet is connected to a cooling medium source. The hopper cooling medium inlet is located at the lower end of the sandwich chamber, and the hopper cooling medium outlet is located at the upper end of the sandwich chamber. The hopper cooling medium outlet is connected to the grid cooling medium inlet.

[0059] Example 3

[0060] Example 2 is repeated, except that the bar grid 31 is inclined and its rotation direction and angle are adjustable. The bar grid 31 is mounted on the hopper via a connecting rod, and a rotary bearing is provided between the connecting rod and the bar grid 31.

[0061] Example 4

[0062] The embodiment 3 is repeated, except that the dry cooling device 4 includes a horizontally arranged cylindrical outer shell 41 and an inner shell 42. The inner shell 42 is coaxially fitted inside the outer shell 41. A sandwich chamber is formed between the outer side wall of the inner shell 42 and the inner side wall of the outer shell 41, and the sandwich chamber has a sandwich cooling medium inlet and a sandwich cooling medium outlet. Both the sandwich cooling medium inlet and outlet of the sandwich chamber are located at the discharge end of the inner shell 42.

[0063] Example 5

[0064] The embodiment 4 is repeated, except that a cooling pipe 43 extending axially is also provided along the inner sidewall of the inner shell 42. The pipe medium inlet of the cooling pipe 43 is connected to the cooling medium outlet of the interlayer, and the pipe medium outlet of the cooling pipe 43 is connected to the outside. The cooling pipe 43 is arranged in a spiral shape on the inner sidewall of the inner shell 42, extending circumferentially along the inner sidewall of the inner shell 42.

[0065] Example 6

[0066] The embodiment 5 is repeated, except that the cooling medium inlet of the cooling pipe 43 is located at the feed end of the inner shell 42, and the cooling medium inlet is connected to the cooling medium outlet of the interlayer. The cooling medium outlet of the cooling pipe 43 is located at the discharge end of the inner shell 42.

[0067] Example 7

[0068] The embodiment 6 is repeated, except that a guide vane that protrudes into the inner shell 42 and extends along the length of the cooling pipe 43 is fixedly provided on the cooling pipe 43.

[0069] Example 8

[0070] The dry cooling device 4 is repeated in embodiment 7, except that it further includes a feeding mechanism 44. The feeding mechanism 44 includes a feeding pipe 441, the outlet end of which is connected to the inlet end of the inner shell 42, and the inlet end of the feeding pipe 441 is connected to the outlet of the hopper 32. The feeding mechanism 44 also includes a frequency detector and a vibrator mounted on the wall of the feeding pipe 441, with the frequency detector and vibrator connected via signal transmission. The frequency detector is also connected to an alarm. A dust collector 442 is also provided on the inner wall of the feeding pipe 441.

[0071] Example 9

[0072] The dry cooling device 4 is repeated in embodiment 8, except that it further includes a screening mechanism 45. The screening mechanism 45 includes a screen cylinder 451. The inlet of the screen cylinder 451 is connected to the outlet of the inner shell 42, and the screen cylinder 451 has an outlet for large particles and an outlet for small particles. The screening mechanism 45 also includes a gravity flap door 452. The gravity flap door 452 is located at the outlet for large particles of the screen cylinder 451.

[0073] Example 10

[0074] The same method as Embodiment 9 is used, except that the system also includes a waste heat boiler 5. The flue gas outlet of the rotary kiln 2 is connected to the heat source inlet of the waste heat boiler 5.

[0075] Example 11

[0076] The system is a repeat of Example 10, except that it also includes a flue gas purification device 6. The heat source outlet of the waste heat boiler 5 is connected to the flue gas inlet of the flue gas purification device 6.

[0077] Example 12

[0078] The system repeats Embodiment 11, except that it further includes a multi-stage media utilization device 7. This multi-stage media utilization device 7 is a deaerator. The liquid inlet of the deaerator is connected to the outlets of the hopper cooling medium, the grid cooling medium, and the pipeline cooling medium. The liquid outlet of the deaerator 71 is connected to the inlet of the evaporator of the waste heat boiler 5.

[0079] The process of treating zinc-containing dust and sludge using a comprehensive roasting and grading cooling system as described in Example 12 is as follows:

[0080] Cooling water is introduced into the inner cavity of the grid, the interlayer chamber on the side of the hopper wall, the interlayer chamber between the inner shell and the outer shell, and the cooling pipes.

[0081] After being pelletized, the zinc-containing dust and sludge enters a rotary kiln for high-temperature roasting. The kiln slag is discharged and falls onto a grate. After screening, large particles of kiln slag enter a cooling tank, while small particles enter a hopper. The small particles fall from the hopper into the feed pipe and then into the inner shell cavity for dry cooling. During the rotation of the shell, they move towards the discharge end of the inner shell and are finally discharged, entering a screen cylinder for further screening to obtain the dry-cooled kiln slag.

[0082] The flue gas discharged from the rotary kiln enters the heat source inlet of the waste heat boiler. The inner cavity of the grid, the interlayer chamber on the side of the hopper wall, the interlayer chamber between the inner shell and the outer shell, and the cooling water discharged from the cooling pipes enter the evaporator of the waste heat boiler after passing through the deaerator.

Claims

1. An integrated calcining staged cooling system characterized by: The system includes a pelletizing device (1), a rotary kiln (2), a graded cooling device (3), and a dry cooling device (4); wherein, the graded cooling device (3) includes a grid (31), a hopper (32), and a cooling pool (33); the outlet of the pelletizing device (1) is connected to the inlet of the rotary kiln (2); the outlet of the rotary kiln (2) is located above the inlet of the hopper (32), and the grid (31) is located between the outlet of the rotary kiln (2) and the inlet of the hopper (32); the coarse material outlet of the grid (31) is connected to the cooling pool (33), and the fine material outlet of the grid (31) is connected to the inlet of the hopper (32); the outlet of the hopper (32) is connected to the inlet of the dry cooling device (4).

2. The system of claim 1, wherein: The grid (31) includes multiple grid bars (311) arranged in the same plane, and there is a gap between any two adjacent grid bars (311); the grid bar (311) has an inner cavity, and the grid bar (311) has a grid bar cooling medium inlet and a grid bar cooling medium outlet connected to the inner cavity. The grid bar cooling medium inlet is connected to the cooling medium source.

3. The system of claim 2, wherein: The hopper (32) has a sandwiched chamber on the side of the hopper wall. The sandwiched chamber has a hopper cooling medium inlet and a hopper cooling medium outlet. The hopper cooling medium inlet is connected to the cooling medium source.

4. The system of claim 3, wherein: The hopper cooling medium inlet is located at the lower end of the interlayer chamber, and the hopper cooling medium outlet is located at the upper end of the interlayer chamber.

5. The system of claim 4, wherein: The cooling medium outlet of the hopper is connected to the cooling medium inlet of the grid bar.

6. The system of claim 2, wherein: The strip (31) is inclined and the rotation direction and angle of the strip (31) are adjustable.

7. The system of claim 1, wherein: The dry cooling device (4) includes a horizontally arranged cylindrical outer shell (41) and an inner shell (42); the inner shell (42) is coaxially fitted inside the outer shell (41); wherein, an interlayer chamber is formed between the outer side wall of the inner shell (42) and the inner side wall of the outer shell (41), and an interlayer cooling medium inlet and an interlayer cooling medium outlet are provided on the interlayer chamber.

8. The system of claim 7, wherein: The inlet and outlet of the interlayer cooling medium in the interlayer chamber are both located at the discharge end of the inner shell (42).

9. The system of claim 7, wherein: A cooling pipe (43) extending axially is also provided along the inner wall of the inner shell (42). The inlet of the cooling medium of the cooling pipe (43) is connected to the outlet of the interlayer cooling medium, and the outlet of the cooling medium of the cooling pipe (43) is connected to the outside.

10. The system of claim 9, wherein: The cooling pipe (43) is arranged in a spiral shape on the inner wall of the inner shell (42), extending circumferentially along the inner wall of the inner shell (42).

11. The system of claim 10, wherein: The cooling medium inlet of the cooling pipe (43) is located at the feed end of the inner shell (42), and the cooling medium inlet is connected to the cooling medium outlet of the interlayer; the cooling medium outlet of the cooling pipe (43) is located at the discharge end of the inner shell (42).

12. The system of claim 11, wherein: A guide vane is fixedly or movably installed on the cooling pipe (43) and protrudes into the inner shell (42) and extends along the length of the cooling pipe (43).

13. The system of claim 9, wherein: The dry cooling device (4) also includes a feeding mechanism (44); the feeding mechanism (44) includes a feeding pipe (441), the discharge end of the feeding pipe (441) is connected to the feeding end of the inner shell (42), and the feeding end of the feeding pipe (441) is connected to the discharge port of the hopper (32).

14. The system of claim 13, wherein: The feeding mechanism (44) also includes a frequency detector and a vibrator installed on the wall of the feed pipe (441), and the frequency detector and the vibrator are connected by signal transmission.

15. The system of claim 14, wherein: The frequency detector is also connected to an alarm.

16. The system of claim 15, wherein: The feed pipe (441) is also provided with a dust cleaner (442) on its inner wall.

17. The system of claim 13, wherein: The dry cooling device (4) also includes a screening mechanism (45); the screening mechanism (45) includes a screen cylinder (451); the inlet of the screen cylinder (451) is connected to the outlet of the inner shell (42), and the screen cylinder (451) is provided with a large particle material outlet and a small particle material outlet.

18. The system of claim 17, wherein: The screening mechanism (45) also includes a gravity flap gate (452); the gravity flap gate (452) is located at the large particle material outlet of the screen cylinder (451).

19. The system of any one of claims 1-18, wherein: The system also includes a waste heat boiler (5); the flue gas outlet of the rotary kiln (2) is connected to the heat source inlet of the waste heat boiler (5).

20. The system of claim 19, wherein: The system also includes a flue gas purification device (6); the heat source outlet of the waste heat boiler (5) is connected to the flue gas inlet of the flue gas purification device (6).

21. The system of claim 20, wherein: The system also includes a multi-stage media utilization device (7); the multi-stage media utilization device (7) is a deaerator; the liquid inlet of the deaerator is connected to the hopper cooling medium outlet and / or the grid cooling medium outlet and / or the pipeline cooling medium outlet.

22. The system of claim 21, wherein: The liquid outlet of the deaerator is connected to the evaporator inlet of the waste heat boiler (5).

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