Pellet stratified cooling bin and application method thereof

Abstract

The present invention discloses a pellet stratified cooling bin and an application method thereof, comprising: a bin body, a stratified cooling mechanism provided in the bin body, the stratified cooling mechanism comprising: a support plate, a water-cooling pipe and an air-cooling pipe, a plurality of layers of inclined water-cooling pipes provided from top to bottom between two support plates, a plurality of air-cooling pipes evenly distributed between the water-cooling pipes of each layer, a plurality of air outlet holes evenly distributed on the bottom wall of each air-cooling pipe, a discharge port provided at the right end of the bin body, a material blocking gate provided for lifting in the discharge port, an exhaust hole and a connected feed hopper and a discharge cavity provided on the bin body, a valve provided on the feed hopper, a plurality of discharge holes provided on the right side wall of the discharge cavity, a guide plate provided obliquely downwardly on the discharge hole, an inclined guide platform inclined downwardly from left to right provided for lifting in the discharge cavity, and a blocking plate provided for extending downwardly on the inclined guide platform. The present invention can stratify high-temperature pellets, reduce their layer thickness, and enable the high-temperature pellets to be cooled quickly and evenly.

Description

Technical Field

[0001] The present invention relates to the field of metallurgy, and in particular to a pellet stratified cooling bin and an application method thereof. Background Art

[0002] The application of metallized charge is an important trend in the development of the modern metallurgical industry, and metal pellets are the main raw material for metallized charge. During the production process, the temperature of the metal pellets reaches as high as 1100°C, and the metal pellets need to be cooled to below 150°C to meet the requirements of transportation and storage.

[0003] Currently, there are two main cooling methods for high-temperature metal pellets on the market: water cooling and air cooling. Air cooling is to pass a chain grate loaded with a large number of high-temperature pellets through an air duct. The air flow blown out of the air duct passes through the high-temperature pellet layer in the chain grate from bottom to top. The air flow first exchanges heat with the high-temperature pellets in the lower layer and then the temperature rises. The air flow with increased temperature is not conducive to cooling the high-temperature pellets in the upper layer, and the cooling time needs to be extended. There are two types of water cooling. One is to put the high-temperature pellets directly into the cooling water for cooling. When the high-temperature pellets are in direct contact with the cooling water, the outside of the high-temperature pellets will cool down rapidly, while the inner core temperature of the high-temperature pellets is extremely high, which can easily cause the pellets to burst. Moreover, after the pellets come into contact with water, more water will be retained. After a long period of contact with the air, they are easily oxidized, and the pellets will pollute the water. It is necessary to set up sewage treatment equipment in the future to purify the contaminated cooling water. The other is to put the high-temperature pellets into a metal cylinder, and then use a spray device to spray the cylinder containing the high-temperature pellets, so that the cooling water and the cylinder body can exchange heat to achieve cooling. This cooling method is similar to air cooling. It can only cool the high-temperature pellets on the outside first. The high-temperature pellets accumulated inside need to stand for a long time before they can be cooled, and the cooling time is also longer. Summary of the Invention

[0004] The object of the present invention is to provide a pellet stratified cooling bin capable of rapidly and uniformly cooling pellets and an application method thereof.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pellet stratified cooling bin, comprising: a bin body, a stratified cooling mechanism is arranged in the bin body, the stratified cooling mechanism comprises: two support plates, a plurality of water-cooling tubes and a plurality of air-cooling tubes, the two support plates are fixed in the bin body, a plurality of support frames are arranged from top to bottom between the two support plates, a plurality of water-cooling tubes inclined downward from left to right are arranged at intervals from front to back on each layer of support frames, the gap between each two adjacent water-cooling tubes on each layer of support frames is smaller than the ball diameter of the compliant pellets, the water inlet and outlet of the water-cooling tube are connected to the water reservoir, a layer of air-cooling tube is evenly spaced from left to right between the two adjacent layers of water-cooling tubes, and a layer of air-cooling tube is evenly spaced from left to right between the two support plates above the water-cooling tube on the top layer. Tube, a plurality of air outlet holes are arranged on the bottom wall of each air-cooling tube, the air-cooling tube is connected with the pipeline fan, a discharge port is arranged at the right end of the bin body, and a material blocking gate is arranged for lifting in the discharge port, and the distance between the material blocking gate and the water-cooling tube is smaller than the ball diameter of the compliant pellets, exhaust holes and connected feed hopper and discharge cavity are arranged on the bin body, a valve is arranged on the feed hopper, the discharge cavity is vertically arranged in the bin body and on the left side of the layered cooling mechanism, a plurality of discharge holes are arranged in sequence from top to bottom on the right side wall of the discharge cavity, each discharge hole corresponds to a layer of water-cooling tube, and a guide plate is arranged obliquely downward on the discharge hole, and the lower end of the guide plate rests on the water-cooling tube of the corresponding layer, and an inclined guide platform inclined downward from left to right is arranged for lifting in the discharge cavity, and a sealing plate is provided at the right end of the inclined guide platform extending downward.

[0006] Furthermore, the aforementioned pellet stratified cooling bin, wherein an exhaust pipe is provided on the exhaust hole, a first three-way solenoid valve and a temperature sensor are provided on the exhaust pipe, a first connecting pipe and a second connecting pipe are respectively connected to the two outlet ends of the first three-way solenoid valve, a second three-way solenoid valve is provided on the first connecting pipe, a return air pipe and a first heat recovery branch are respectively connected to the two outlet ends of the second three-way solenoid valve, a third three-way solenoid valve is provided on the second connecting pipe, and the second heat recovery branch and the third heat recovery branch are respectively connected to the two outlet ends of the third three-way solenoid valve.

[0007] Furthermore, in the aforementioned pellet stratified cooling bin, a scissor lift mechanism capable of driving the inclined guide platform to move up and down is provided in the discharge cavity.

[0008] Furthermore, in the aforementioned pellet stratified cooling bin, a first jacket is provided on the outer wall of the bin body, and a second jacket is provided on the outer wall of the discharge cavity, and the inlet and outlet water pipes of the first jacket and the second jacket are both connected to the water reservoir.

[0009] Furthermore, the aforementioned pellet stratified cooling bin is provided with a first inspection port on the bin body, a first inspection door on the first inspection port, a slag outlet on the support plate near the first inspection port, a second inspection port on the discharge cavity, and a second inspection door on the second inspection port.

[0010] Furthermore, in the aforementioned pellet stratified cooling bin, the connection structure between the material blocking gate and the bin body is as follows: a guide hole connected to the discharge port is opened on the bin body, trapezoidal convex guide rails are respectively provided on the front and rear side walls of the guide hole, trapezoidal concave guide grooves that can be adapted to the trapezoidal convex guide rails are respectively provided on the front and rear side walls of the material blocking gate, a chain drive lifting mechanism connected to the material blocking gate is provided on the bin body, the bottom wall of the discharge port is an inclined wall inclined downward from left to right, and the bottom wall of the material blocking gate is wedged with the inclined wall.

[0011] Furthermore, in the aforementioned pellet layered cooling bin, a plurality of cooling fans are evenly distributed on the inner wall of the bin, and metal mesh shields are provided on the outer sides of the cooling fans.

[0012] Furthermore, in the aforementioned pellet stratified cooling bin, the water inlet of each layer of water-cooling pipe is connected to a water inlet distribution pipe, and the water outlet of each layer of water-cooling pipe is connected to a water outlet distribution pipe. The water inlet distribution pipe and the water outlet distribution pipe are both connected to two support plates. A water inlet pipe and a water outlet pipe are provided on the bin body. The water inlet pipe and the water outlet pipe are connected to the water tank through a hose. The connecting ends of the water inlet distribution pipe and the water outlet distribution pipe extend out of the support plate and are respectively connected to the water inlet pipe and the water outlet pipe.

[0013] Furthermore, in the aforementioned pellet layered cooling bin, the air inlet end of the air cooling pipe extends out of the support plate, the air inlet end of each layer of air cooling pipe is connected to an air inlet distribution pipe, an air inlet connecting pipe is provided on the bin body, the air inlet connecting pipe is connected to the duct fan through a hose, the connecting end of the air inlet distribution pipe is connected to the air inlet connecting pipe, and a metal mesh plate that allows pellets smaller than the compliance and waste residue to pass through is placed under each layer of air cooling pipe, and the metal mesh plate is connected to two support plates.

[0014] The application method of the pellet stratified cooling bin comprises the following steps:

[0015] S1. The inclined guide table moves to the position where it passes over the uppermost discharge hole and stops. The blocking plate on the inclined guide table blocks all discharge holes in the discharge cavity. The cooling water in the water reservoir enters the water cooling pipe for circulating water cooling. The cooling air blown out from the duct fan enters the air cooling pipe and is then blown out from the air outlet of the air cooling pipe.

[0016] S2. The high-temperature pellets that have been roasted are fed into the feed hopper, and the valve is opened. The high-temperature pellets are accumulated on the inclined guide table in the discharge chamber, and the inclined guide table descends. Every time the inclined guide table descends and passes through a discharge hole, the high-temperature pellets on the inclined guide table will roll through the discharge hole to each layer of water-cooling pipe under their own weight, and then stay on the water-cooling pipe of the corresponding layer under the obstruction of the material blocking gate. After the high-temperature pellets on the inclined guide table enter the warehouse, the inclined guide table rises to cross the top discharge hole and stops. The blocking plate on the inclined guide table blocks all the discharge holes in the discharge chamber again. At the same time, the water-cooling pipe and the air-cooling pipe cool the high-temperature pellet layer on each layer of water-cooling pipe at the same time, and the hot air is discharged outward through the exhaust hole.

[0017] S3. Open the valve to allow the discharge cavity to come into contact with the outside air for rapid cooling. After cooling is complete, close the valve and wait for the next feeding.

[0018] S4. After the high-temperature pellets in the silo are cooled to a temperature suitable for storage and transportation, the material blocking valve is opened and the pellets on each layer of water-cooling tubes are discharged outward through the discharge port under the action of their own weight.

[0019] The advantages of the present invention are that the original high-temperature pellet layer is transported in batches to the water-cooling tubes of different layers of the stratified cooling mechanism through different discharge holes on the discharge chamber, so that the layer thickness of the high-temperature pellet layer is reduced, and the lower layer of the high-temperature pellet layer on each layer of water-cooling tube is cooled by heat exchange with the circulating cooling water in the water-cooling tube, while the upper layer of the high-temperature pellet layer on each layer of water-cooling tube is cooled by heat exchange with the cold air blown out of the air-cooling tube. After the layer thickness of the high-temperature pellet layer is reduced, the pellets in each layer of high-temperature pellets can be cooled evenly, which improves the cooling efficiency of each layer of high-temperature pellets by air cooling and water cooling; the pellets can be dropped under their own weight on the inclined water-cooling tube, which solves the defect that the traditional chain grate machine needs to use a large amount of electricity; when the pellets roll on each layer of water-cooling tube, the pellets and waste residue smaller than the ball diameter of the qualified pellets will fall from the gap of the water-cooling tube to the bottom of the bin body, so that the unqualified pellets and waste residue can be automatically screened out. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the pellet stratified cooling bin of the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of the partial cross-sectional structure in the top view direction.

[0022] Figure 3 yes Figure 1 Schematic diagram of the locally enlarged structure in the A direction. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0024] like Figures 1 to 3As shown, the pellet stratified cooling bin described in the present invention includes: a bin body 1, a first jacket 11 is arranged on the outer wall of the bin body 1, the inlet and outlet water pipes of the first jacket 11 are connected to the water tank, a first inspection port is provided on the bin body 1, a first inspection door 12 is provided on the first inspection port, a plurality of cooling fans 13 are evenly distributed on the inner wall of the bin body 1, and a metal mesh shield is provided on the outer side of the cooling fan 13 to protect the cooling fan 13. A layered cooling mechanism 2 is provided in the silo 1, and the layered cooling mechanism 2 includes: two support plates 21, a plurality of water-cooling pipes 22 and a plurality of air-cooling pipes 23. The two support plates 21 are fixed in the silo 1, and the support plates 21 are not connected to the top of the silo 1, so that the air in the silo 1 is connected to the air in the layered cooling mechanism 2. A slag outlet 211 is provided on the support plate 21 near the first inspection port, and a plurality of layers of support frames 212 are provided between the two support plates 21 from top to bottom. On each layer of the support frame 212, a plurality of water-cooling pipes 22 are arranged from front to back and tilted downward from left to right. The inclination angle of the water-cooling tube 22 is 5° to 7°. The gap between each adjacent two water-cooling tubes 22 on each layer of the support frame 212 is smaller than the ball diameter of the compliant pellets. In this way, when the pellets enter the water-cooling tubes 22 of each layer, the compliant pellets can roll in the gap between the water-cooling tubes 22 and the water-cooling tubes 22, while the pellets smaller than the ball diameter of the compliant pellets will fall from the gap to the bottom of the warehouse body 1. The water inlet of each layer of the water-cooling tube 22 is connected to a water inlet distribution pipe 24, and the water outlet of each layer of the water-cooling tube 22 is connected to a water outlet distribution pipe 25. The water inlet distribution pipe 24 and the water outlet distribution pipe 25 are both connected to the two support frames. The support plate 21 is connected, and a water inlet pipe 14 and a water outlet pipe 15 are provided on the silo 1. The water inlet pipe 14 and the water outlet pipe 15 are connected to the water reservoir through a hose. The connecting ends of the water inlet distribution pipe 24 and the water outlet distribution pipe 25 extend out of the support plate 21 and are connected to the water inlet pipe 14 and the water outlet pipe 15 respectively. A layer of air cooling pipe 23 is evenly distributed from left to right between the two adjacent layers of water cooling pipes 22 above the upper and lower layers. A layer of air cooling pipe 23 is evenly distributed from left to right between the two support plates 21 above the water cooling pipe 22 on the uppermost layer. A plurality of air outlet holes are evenly distributed on the bottom wall of each air cooling pipe 23. 3 is provided with a metal mesh plate 26 that can allow pellets and waste residues smaller than the standard to pass through. The metal mesh plate 26 will not hinder the falling of non-compliant pellets and waste residues. The metal mesh plate 26 is connected to the two support plates 21. The metal mesh plate 26 can prevent the pellets from contacting the air-cooling pipe 23, thereby protecting the air-cooling pipe 23. The air inlet end of the air-cooling pipe 23 extends out of the support plate 21. The air inlet end of each layer of air-cooling pipe 23 is connected to an air inlet distribution pipe 27. An air inlet pipe 16 is provided on the warehouse body 1. The air inlet pipe 16 is connected to the pipeline fan through a hose, and the connecting end of the air inlet distribution pipe 27 is connected to the air inlet pipe 16.

[0025] An exhaust hole is provided on the silo 1, an exhaust pipe 17 is provided on the exhaust hole, a first three-way solenoid valve 171 and a temperature sensor 172 are provided on the exhaust pipe 17, the two outlet ends of the first three-way solenoid valve 171 are connected to a first connecting pipe 173 and a second connecting pipe 174 respectively, a second three-way solenoid valve 175 is provided on the first connecting pipe 173, and the two outlet ends of the second three-way solenoid valve 175 are connected to a return air pipe 1751 and a first return air pipe 1752 respectively. The hot branch pipe 1752 and the return air pipe 1751 are connected to the exhaust gas treatment system. The first heat recovery branch pipe 1752 is connected to the drying system. A third three-way solenoid valve 176 is provided on the second connecting pipe 174. The two outlet ends of the third three-way solenoid valve 176 are respectively connected to the second heat recovery branch pipe 1761 and the third heat recovery branch pipe 1762. The second heat recovery branch pipe 1761 is connected to the roasting section of the roasting machine, and the third heat recovery branch pipe 1762 is connected to the preheating section of the roasting machine. The cooling system on the market is divided into three stages. Each cooling section is connected to the preheating section, roasting section and drying system of the roasting machine according to the different temperatures. The high temperature gas in the cooling section is used for auxiliary work. Therefore, the roasting machine and the drying system are both existing technologies, and the exhaust gas treatment system is also existing technologies. They will not be described in detail here and are not shown in the figure.

[0026] A discharge port 18 is provided at the right end of the silo body 1, and a material blocking gate 5 is provided for lifting in the discharge port 18. The distance between the material blocking gate 5 and the water-cooling pipe 22 is smaller than the ball diameter of the compliant pellets. The connection structure between the material blocking gate 5 and the silo body 1 is as follows: a guide hole connected to the discharge port 18 is opened on the silo body 1, and trapezoidal convex guide rails 181 are respectively provided on the front and rear side walls of the guide hole, and trapezoidal concave guide grooves that can be adapted to the trapezoidal convex guide rails 181 are respectively provided on the front and rear side walls of the material blocking gate 5. A chain drive lifting mechanism 6 connected to the material blocking gate 5 is provided on the silo body 1. The chain drive lifting mechanism 6 is a prior art and is not described again here. The bottom wall of the discharge port 18 is an inclined wall 182 inclined downward from left to right, and the bottom wall of the material blocking gate 5 is wedged with the inclined wall.

[0027] A feed hopper 3 and a discharge chamber 4 are connected on the silo 1. A valve 31 is provided on the feed hopper 3. The discharge chamber 4 is vertically arranged in the silo 1 and is located on the left side of the stratified cooling mechanism 2. A second jacket 41 is provided on the outer wall of the discharge chamber 4. The inlet and outlet pipes of the second jacket 41 are connected to the water reservoir. A second inspection port is provided on the discharge chamber 4. A second inspection door 42 is provided on the second inspection port. A number of discharge holes 43 are arranged in sequence from top to bottom, each discharge hole 43 corresponds to a layer of water-cooling tube 22, and a guide plate 44 is arranged obliquely downward on the discharge hole 43, and the lower end of the guide plate 44 rests on the water-cooling tube 22 of the corresponding layer. A scissors-type lifting mechanism 45 is provided in the discharge cavity 4, and an inclined guide platform 46 inclined downward from left to right is provided on the scissors-type lifting mechanism 45, and a sealing plate 47 is provided at the right end of the inclined guide platform 46 extending downward.

[0028] The application method of the pellet stratified cooling bin of the present invention comprises the following steps:

[0029] S1, the scissor lift mechanism 45 pushes the inclined guide platform 46 to move up and stop at the place where it passes the uppermost discharge hole 43. The blocking plate 47 on the inclined guide platform 46 blocks all the discharge holes 43 in the discharge cavity 4. The cooling water in the water reservoir enters the water cooling pipes 22 of each layer through the water inlet distribution pipes 24, and then flows back to the water reservoir from the water outlet distribution pipes 25 to form a circulating water cooling system. The cooling water in the water reservoir circulates through the first jacket 11 and the second jacket 41 to form a circulating water cooling system. At the same time, the cooling fan 13 and the pipeline fan are turned on, and the pipeline fan blows out The cooling air passes through the air inlet distribution pipes 27 and enters the air cooling pipes 23 on each layer, and then is blown out from the air outlet holes of the air cooling pipes 23. At this time, the temperature in the warehouse body 1 is at room temperature, and the temperature sensor 172 on the exhaust pipe 17 senses that the temperature in the warehouse body 1 is low. The first three-way solenoid valve 171 on the exhaust pipe 17 is opened to switch it to the passage of the first connecting pipe 173, and the second three-way solenoid valve 175 is switched to the passage of the return air pipe 1751. At this time, the air in the warehouse body 1 will pass through the return air pipe 1751 and enter the exhaust gas treatment system for subsequent treatment;

[0030] S2. The high-temperature pellets after roasting are fed into the feed hopper 3, the valve 31 is opened, and the high-temperature pellets are accumulated on the inclined guide platform 46 in the discharge chamber 4. The second jacket 41 performs preliminary cooling on the discharge chamber 4, and then the valve 31 is closed to seal the discharge chamber 4. The scissor lift mechanism 45 drives the inclined guide platform 46 to descend. When the inclined guide platform 46 descends to open the uppermost discharge hole 43, the high-temperature pellets on the inclined guide platform 46 will roll down to the uppermost water-cooling pipe 22 through the uppermost discharge hole 43 under their own weight, and then be blocked by the support plate 21 and the blocking gate 5 and stay on the uppermost layer. On the water-cooling tube 22, during the rolling process, the pellets and waste residues smaller than the qualified ball diameter will fall from the gaps between the water-cooling tubes 22 to the gaps between the water-cooling tubes 22 of the lower layer, and finally fall to the bottom of the warehouse body 1. When the water-cooling tubes 22 of the uppermost layer are covered with high-temperature pellets, the high-temperature pellets on the inclined guide platform 46 can no longer enter the water-cooling tubes 22 of this layer. The scissor lift mechanism 45 drives the inclined guide platform 46 to continue to descend to open the next discharge hole 43. The high-temperature pellets enter the water-cooling tubes 22 of the corresponding layer through the discharge hole 43. The inclined guide platform 46 continues to descend until all the high-temperature pellets are The pellets enter the water-cooling tubes 22 on each layer and form a high-temperature pellet layer. Since the inclination angle of the water-cooling tubes 22 is 5° to 7°, the high-temperature pellets roll down slowly under their own weight, so that the collision between the high-temperature pellets and between the high-temperature pellets and the support plate 21 and the material blocking gate 5 is weak, thereby protecting the integrity of the high-temperature pellets. In addition, the pellets that do not meet the standard ball diameter will fall down from the gap during the rolling process, and the pellets and waste residues that do not meet the requirements will be automatically screened out. When the high-temperature pellets on the inclined guide table 46 all enter the layered cooling mechanism 2, the scissor lift mechanism 45 drives the inclined guide table 46 to rotate. After rising to pass over the uppermost discharge hole 43, it stops, and the blocking plate 47 on the inclined guide platform 46 blocks all the discharge holes 43 on the discharge chamber 4 again. The lower layer of the high-temperature pellet layer is in direct contact with the water cooling pipe 22 for cooling, while the upper layer of the high-temperature pellet layer is cooled by the air cooling pipe 23. Since the first jacket 11 on the silo 1 cools the side wall of the silo 1, the cooling fan 13 can improve the heat exchange efficiency between the high-temperature air in the silo 1 and the side wall of the silo 1 when blowing, thereby increasing the air cooling speed in the silo 1 and playing an auxiliary role in cooling the pellets.

[0031] During this process, the temperature in the silo 1 will change significantly. The temperature in the silo 1 changes with the temperature of the pellets. When the temperature sensor 172 on the exhaust pipe 17 senses that the temperature in the silo 1 is not less than 1000°C, the first three-way solenoid valve 171 is switched to the passage of the second connecting pipe 174, and the third three-way solenoid valve 176 is switched to the passage of the second heat recovery branch pipe 1761. The high-temperature gas of not less than 1000°C in the silo 1 enters the roasting section of the roaster through the second connecting pipe 174 and the second heat recovery branch pipe 1761 to increase the temperature of the roasting section, thereby improving the combustion of the pulverized coal and improving the roasting quality of the pellets.

[0032] After a period of cooling, the temperature in the silo 1 will decrease. When the temperature sensor 172 senses that the temperature in the silo 1 is between 600°C and 1000°C, the third three-way solenoid valve 176 switches to the passage of the third heat recovery branch pipe 1762. The high-temperature gas of 600°C to 1000°C in the silo 1 enters the preheating section of the roaster through the second connecting pipe 174 and the third heat recovery branch pipe 1762 to improve the preheating quality of the pellets.

[0033] After a period of cooling, the temperature inside the silo 1 will continue to drop. When the temperature sensor 172 senses that the temperature inside the silo 1 is between 150°C and 600°C, the first three-way solenoid valve 171 switches to the passage of the first connecting pipe 173, and the second three-way solenoid valve 175 switches to the passage of the first heat recovery branch pipe 1752. The high-temperature gas of 150°C to 600°C in the silo 1 enters the drying system through the first connecting pipe 173 and the first heat recovery branch pipe 1752 for auxiliary drying.

[0034] Finally, when the temperature sensor 172 senses that the temperature inside the silo 1 is lower than 150°C, the second three-way solenoid valve 175 switches to the path of the return air duct 1751. The gas below 150°C in the silo 1 enters the exhaust gas treatment system through the first connecting pipe 173 and the return air duct 1751 for treatment.

[0035] S3. Open the valve 31 to allow the discharge chamber 4 to come into contact with the outside air for rapid cooling. Since the blocking plate 47 blocks all the discharge holes 43, the flowing gas in the silo 1 will enter the discharge chamber 4. When the valve 31 is opened, no dust will be generated. After the discharge chamber 4 is cooled, close the valve 31 and wait for the next feeding.

[0036] S4. After the high-temperature pellets in the silo 1 are cooled to a temperature suitable for storage and transportation (i.e., below 150°C), the chain-driven lifting mechanism 6 drives the material-blocking valve 5 to move upward, opening the discharge port 18. The pellets on each layer of the water-cooling tubes 22 are discharged outward through the discharge port 18 under their own weight. Since the bottom wall of the discharge port 18 is a slanted wall 182 sloping downward from left to right, the pellets will not accumulate on the bottom wall of the discharge port 18.

[0037] S5. When the silo 1 needs to be cleaned and there is still residual heat in the silo 1, the air cooling pipe 23 is used to spray the water cooling pipe 22 so that the dust remaining on the water cooling pipe 22 is blown down to the bottom of the silo 1. Then, the air cooling pipe 23 is closed. After the temperature in the silo 1 drops to room temperature (which can be determined based on the temperature displayed by the temperature sensor 172), the first inspection door 12 on the silo 1 is opened. The staff enters the silo 1 through the first inspection port and enters the lower part of the stratified cooling mechanism 2 through the slag outlet 211 on the support plate 21 to clean the area. After cleaning, the first inspection door 12 can be closed.

[0038] When the scissor lift mechanism 45 in the discharge chamber 4 needs to be inspected and repaired, the first inspection door 12 on the bin body 1 and the second inspection door 42 on the discharge chamber 4 are opened in sequence, and the staff can carry out the inspection and repair work.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. Pellet stratification cooling bin, including: The silo is characterized in that: a layered cooling mechanism is provided in the silo, and the layered cooling mechanism includes: two support plates, a plurality of water-cooling tubes and a plurality of air-cooling tubes, the two support plates are fixed in the silo, and a plurality of support frames are provided between the two support plates from top to bottom, and a plurality of water-cooling tubes tilted downward from left to right are arranged at intervals from front to back on each layer of support frames, and the gap between each two adjacent water-cooling tubes on each layer of support frames is smaller than the ball diameter of the compliant pellets, and the water inlet and outlet of the water-cooling tube are both connected to the water reservoir, and a layer of air-cooling tubes is evenly distributed from left to right between the two adjacent layers of water-cooling tubes, and a layer of air-cooling tubes is evenly distributed from left to right between the two support plates above the water-cooling tubes on the uppermost layer, and the bottom wall of each air-cooling tube is evenly distributed. There are several air outlet holes, the air cooling pipe is connected with the pipeline fan, a discharge port is provided at the right end of the silo body, and a material blocking gate is provided in the discharge port for lifting and lowering, and the distance between the material blocking gate and the water cooling pipe is smaller than the ball diameter of the compliant pellets, exhaust holes and connected feed hopper and discharge chamber are provided on the silo body, a valve is provided on the feed hopper, the discharge chamber is vertically arranged in the silo body and on the left side of the layered cooling mechanism, and several discharge holes are provided in sequence from top to bottom on the right side wall of the discharge chamber, each discharge hole corresponds to a layer of water cooling pipe, and a guide plate is provided obliquely downward on the discharge hole, and the lower end of the guide plate rests on the water cooling pipe of the corresponding layer, and an inclined guide platform inclined downward from left to right is provided in the discharge chamber for lifting and lowering, and a sealing plate is provided at the right end of the inclined guide platform extending downward.

2. The pellet stratified cooling bin according to claim 1, characterized in that: An exhaust pipe is provided on the exhaust hole, a first three-way solenoid valve and a temperature sensor are provided on the exhaust pipe, the two outlet ends of the first three-way solenoid valve are respectively connected to the first connecting pipe and the second connecting pipe, a second three-way solenoid valve is provided on the first connecting pipe, the two outlet ends of the second three-way solenoid valve are respectively connected to the return air pipe and the first heat recovery branch pipe, a third three-way solenoid valve is provided on the second connecting pipe, the two outlet ends of the third three-way solenoid valve are respectively connected to the second heat recovery branch pipe and the third heat recovery branch pipe.

3. The pellet stratified cooling bin according to claim 1, characterized in that: A scissor lift mechanism capable of driving the inclined guide platform to move up and down is provided in the discharge cavity.

4. The pellet stratified cooling bin according to claim 1, characterized in that: A first jacket is provided on the outer wall of the bin body, and a second jacket is provided on the outer wall of the discharge cavity. The water inlet and outlet pipes of the first jacket and the second jacket are both connected to the water reservoir.

5. The pellet stratified cooling bin according to claim 1, characterized in that: A first inspection port is provided on the silo body, a first inspection door is provided on the first inspection port, a slag outlet is provided on the support plate close to the first inspection port, a second inspection port is provided on the discharge cavity, and a second inspection door is provided on the second inspection port.

6. The pellet stratified cooling bin according to claim 1, characterized in that: The connection structure between the material blocking gate and the silo body is as follows: a guide hole connected to the discharge port is opened on the silo body, trapezoidal convex guide rails are respectively provided on the front and rear side walls of the guide hole, and trapezoidal concave guide grooves that can be adapted to the trapezoidal convex guide rails are respectively provided on the front and rear side walls of the material blocking gate, a chain drive lifting mechanism connected to the material blocking gate is provided on the silo body, the bottom wall of the discharge port is a slanted wall sloping downward from left to right, and the bottom wall of the material blocking gate is wedged with the slanted wall.

7. The pellet stratified cooling bin according to claim 1, characterized in that: A plurality of cooling fans are evenly distributed on the inner wall of the bin, and a metal mesh shield is arranged on the outer side of the cooling fans.

8. The pellet stratified cooling bin according to claim 1, characterized in that: The water inlet of each layer of water-cooling pipe is connected to a water inlet distribution pipe, and the water outlet of each layer of water-cooling pipe is connected to a water outlet distribution pipe. Both the water inlet distribution pipe and the water outlet distribution pipe are connected to two support plates. A water inlet pipe and a water outlet pipe are provided on the warehouse body. The water inlet pipe and the water outlet pipe are connected to the water reservoir through a hose. The connecting ends of the water inlet distribution pipe and the water outlet distribution pipe extend out of the support plate and are respectively connected to the water inlet pipe and the water outlet pipe.

9. The pellet stratified cooling bin according to claim 1, characterized in that: The air inlet end of the air cooling pipe extends out of the support plate. The air inlet end of each layer of air cooling pipe is connected to an air inlet distribution pipe. An air inlet connecting pipe is provided on the warehouse body. The air inlet connecting pipe is connected to the duct fan through a hose. The connecting end of the air inlet distribution pipe is connected to the air inlet connecting pipe. A metal mesh plate that allows pellets and waste residues smaller than the standard to pass through is provided under each layer of air cooling pipe. The metal mesh plate is connected to two support plates.

10. A method for using the pellet stratified cooling bin according to any one of claims 1 to 9, characterized in that: The steps are as follows: S1. The inclined guide table moves to the position where it passes over the uppermost discharge hole and stops. The blocking plate on the inclined guide table blocks all discharge holes in the discharge cavity. The cooling water in the water reservoir enters the water cooling pipe for circulating water cooling. The cooling air blown out from the duct fan enters the air cooling pipe and is then blown out from the air outlet of the air cooling pipe. S2. The high-temperature pellets that have been roasted are fed into the feed hopper, and the valve is opened. The high-temperature pellets are accumulated on the inclined guide table in the discharge chamber, and the inclined guide table descends. Every time the inclined guide table descends and passes through a discharge hole, the high-temperature pellets on the inclined guide table will roll through the discharge hole to each layer of water-cooling pipe under their own weight, and then stay on the water-cooling pipe of the corresponding layer under the obstruction of the material blocking gate. After the high-temperature pellets on the inclined guide table enter the warehouse, the inclined guide table rises to cross the top discharge hole and stops. The blocking plate on the inclined guide table blocks all the discharge holes in the discharge chamber again. At the same time, the water-cooling pipe and the air-cooling pipe cool the high-temperature pellet layer on each layer of water-cooling pipe at the same time, and the hot air is discharged outward through the exhaust hole. S3. Open the valve to allow the discharge cavity to come into contact with the outside air for rapid cooling. After cooling is complete, close the valve and wait for the next feeding. S4. After the high-temperature pellets in the silo are cooled to a temperature suitable for storage and transportation, the material blocking valve is opened and the pellets on each layer of water-cooling tubes are discharged outward through the discharge port under the action of their own weight.

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