Atmosphere-switched fluidized bed granule delivery device, system and process

Abstract

The application discloses an atmosphere-switching fluidized bed particle conveying device, system and process, and the device comprises a multi-chamber fluidized bed, a first partition plate and a second partition plate are arranged in the multi-chamber fluidized bed, and the multi-chamber fluidized bed is divided into a first fluidized zone, a second fluidized zone and a third fluidized zone through the first partition plate and the second partition plate, wherein the upper space of the first fluidized zone and the second fluidized zone is communicated, the lower space of the second fluidized zone and the third fluidized zone is communicated, the first fluidized zone is fluidized through a first gas, the second fluidized zone and the third fluidized zone are fluidized through a second gas, and particles pass through the first, second and third fluidized zones in sequence, so that the particles are conveyed under different atmospheres; compared with the prior particle conveying device, the application can realize conveying of the particles under two different gas atmospheres, reduces abrasion and extrusion of the particles, and the particles will not be broken and aggregated in the conveying process.

Description

Technical Field

[0001] The present invention relates to the technical field of particle conveying devices, and in particular to an atmosphere switching fluidized bed particle conveying device, system and process. Background Art

[0002] Solids conveying is a chemical unit operation that is crucial in chemical production. Many raw materials, semi-finished products, and finished products are in solid form and need to be transported from one location to another. Commonly used equipment includes screw conveyors, vibrating conveyors, belt conveyors, bucket conveyors, and pneumatic conveyors.

[0003] The above devices have the following problems: (1) The screw conveyor system is based on mature technologies in many solid conveying fields and can provide a good seal, but the disadvantages are that the screw can cause the particles to wear, which will lead to more dust products; the particles installed in the propeller will cause the particles to agglomerate; and the temperature is difficult to control. (2) The vibrating conveyor can keep the particles moving by applying a light force on the particles, but it is difficult to control the temperature of the particles, and there are also problems with the connection and sealing of the system. (3) The sealing performance of bucket elevators, belt conveyors, etc. cannot be guaranteed, and it is also difficult to control the temperature of the particles. (4) All of the above types of conveyors cannot solve the problem of switching between the two atmospheres of particles, and there is a risk of leakage. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides an atmosphere-switching fluidized bed particle conveying device, system and process, which can realize the conveying of particles under switching between two different gas atmospheres, reduce the wear and extrusion of particles, and prevent the particles from breaking and agglomerating during the conveying process.

[0005] The technical solutions of the present invention are as follows:

[0006] In a first aspect of the present invention, an atmosphere-switching fluidized bed particle conveying device is provided, comprising a multi-chamber fluidized bed, wherein a first partition and a second partition are provided in the multi-chamber fluidized bed, and the multi-chamber fluidized bed is divided into a first fluidizing zone, a second fluidizing zone and a third fluidizing zone by the first partition and the second partition, wherein the upper spaces of the first fluidizing zone and the second fluidizing zone are connected, and the lower spaces of the second fluidizing zone and the third fluidizing zone are connected, the first fluidizing zone is fluidized by a first gas, and the second fluidizing zone and the third fluidizing zone are fluidized by a second gas, and the particles pass through the first, second and third fluidizing zones in sequence to realize the conveying of particles under different atmospheres.

[0007] In some embodiments of the present invention, a feed port is provided at the upper portion of the first fluidized zone, and a first gas inlet is provided at the lower portion thereof. The height of the feed port is higher than the height of the material layer.

[0008] In some embodiments of the present application, the lower part of the space communicating the second fluidization zone and the third fluidization zone is provided with a second gas inlet, and the upper part of the third fluidization zone is provided with a discharge outlet, which is located at the position of the material layer.

[0009] In some embodiments of the present application, air distribution plates are arranged in the first fluidization zone, the second fluidization zone and the third fluidization zone, and air distribution holes are uniformly arranged on the air distribution plates.

[0010] In some embodiments of the present application, a mixed gas outlet is arranged at the top of the multi-chamber fluidized bed.

[0011] In the second aspect of the present application, a fluidized bed particle conveying system is provided, the first fluidization zone of the multi-chamber fluidized bed is connected with the first dryer, the third fluidization zone is connected with the second dryer, the first fluidization gas is the same as the drying gas used by the first dryer, and the second fluidization gas is the same as the drying gas used by the second dryer.

[0012] In some embodiments of the present application, the pressure in the first fluidization zone and the second fluidization zone of the multi-chamber fluidized bed is 0.02-2 kPa lower than that of the first dryer, and the pressure in the third fluidization zone is 0.02-2 kPa higher than that of the second dryer.

[0013] In some embodiments of the present application, the top of the first dryer is provided with a first drying gas outlet, and the top of the second dryer is provided with a second drying gas outlet.

[0014] In the third aspect of the present application, a fluidized bed particle conveying process is provided, which comprises:

[0015] After the particle material is dried by the first fluidization gas from the first dryer, the material is directly discharged into the first fluidization zone of the multi-chamber fluidized bed, and is fluidized under the action of the first fluidization gas, then enters the second fluidization zone from the top of the first partition, is fluidized by the second fluidization gas in the second fluidization zone, and all the first fluidization gas in the particles is removed, then the particles enter the third fluidization zone from the bottom of the second partition, and are discharged from the discharge outlet of the third fluidization zone into the second dryer.

[0016] In some embodiments of the present application, the tail gas discharged from the first dryer and the second dryer is recycled after dehydration, and the tail gas discharged from the multi-chamber fluidized bed is the mixed gas of the first fluidization gas and the second fluidization gas, which is discharged after treatment.

[0017] The technical scheme or the technical schemes of the present application have the following beneficial effects:

[0018] (1) The multi-chamber fluidized bed provided in the present invention is used for particle transport. The fluidized bed is divided into three fluidized zones by two partitions. The fluidized zone located in the middle is capable of switching and transitioning particles from the first fluidizing gas to the second fluidizing gas. The particle transport process is well sealed, allowing for seamless connection, and the particles are not exposed to the external atmosphere. The area of ​​the multi-chamber fluidized bed is very small compared to the first dryer and the second dryer, and the total amount of mixed exhaust gas generated is also very low, so the amount of exhaust gas that needs to be separated and treated is very small.

[0019] (2) The present invention transports particles by fluidization. Compared with conventional particle conveying devices, the particles are less susceptible to wear and extrusion, are less likely to break and agglomerate, and the tail gas can be completely collected and processed.

[0020] (3) The present invention can realize the switching transmission of particles in two dryers with different gas atmospheres. The materials in the two dryers flow, but the gases will not leak and affect each other. The first dry gas and the second dry gas discharged from the first dryer only need to be dehydrated before they can be recycled, thereby improving the gas utilization efficiency.

[0021] (4) The first fluidizing gas and the second fluidizing gas entering the bottom of the multi-chamber fluidized bed of the present invention can be set to a temperature to maintain or adjust the temperature of the particles in the three zones within the multi-chamber fluidized bed, thereby avoiding moisture absorption by the particles or changes in material properties due to cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the atmosphere switching fluidized bed particle conveying device of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the fluidized bed particle conveying system of the present invention.

[0024] In the figure: 1-first partition; 2-second partition; 3-multi-chamber fluidized bed; 4-feed port; 5-material layer; 6-first fluidizing zone; 7-second fluidizing zone; 8-third fluidizing zone; 9-discharge port; 10-upper overflow port; 11-lower overflow port; 12-air distribution plate; 13-first dryer; 14-second dryer. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] In a typical embodiment of the present invention, an atmosphere switching fluidized bed particle conveying device is proposed, such as Figure 1As shown, it includes a multi-chamber fluidized bed 3, in which a first partition 1 and a second partition 2 are provided, and the multi-chamber fluidized bed 3 is divided into a first fluidizing zone 6, a second fluidizing zone 7 and a third fluidizing zone 8 by the first partition 1 and the second partition 2, wherein the upper spaces of the first fluidizing zone 6 and the second fluidizing zone 7 are connected, and the lower spaces of the second fluidizing zone 7 and the third fluidizing zone 8 are connected, the first fluidizing zone 7 is fluidized by a first gas (denoted as gas A), and the second fluidizing zone 7 and the third fluidizing zone 8 are fluidized by a second gas (denoted as gas B), and the particles pass through the first, second and third fluidizing zones in sequence to realize the transportation of particles under different atmospheres.

[0028] The interior of the multi-chamber fluidized bed is divided into multiple fluidized zones by the arrangement of the first partition 1 and the second partition 2. Specifically, the first fluidized zone 6 and the second fluidized zone 7 are separated by the first partition 1. The first partition 1 is vertically arranged at the lower position within the device, and an upper overflow port 10 is formed on the top of the first partition. Therefore, the height of the material layer in the first fluidized zone is the same as the height of the fluidized layer in the second fluidized zone, and is the same as the height of the first partition 1. Particles first enter the first fluidized zone 6 and then enter the second fluidized zone 7 through the upper overflow port 10. In the first fluidized zone 6, the material particles are fluidized by gas A, and in the second fluidized zone 7, the material particles are fluidized by gas B. The space above the material layer 5 is a mixed gas space containing a mixture of gas A and gas B.

[0029] In this embodiment, a feed port 4 is provided at the upper portion of the first fluidizing zone 7, through which material particles are input into the first fluidizing zone 7. A first gas inlet is provided at the lower portion of the first fluidizing zone 7, for introducing gas A into the first fluidizing zone 7 for fluidization. The height of the feed port 4 is higher than the height of the material layer 5 in the first fluidizing zone 7 to prevent material particles from overflowing from the feed port.

[0030] The second fluidizing zone 7 and the third fluidizing zone 8 are separated by a second partition 2, and the second partition 2 is vertically arranged at the upper position in the device. A lower overflow port 11 is formed at the bottom of the second partition. A second gas inlet is provided at the lower part of the communication space between the second fluidizing zone 7 and the third fluidizing zone 8. Gas B enters the communication space between the second fluidizing zone 7 and the third fluidizing zone 8 through the second gas inlet. The material particles are fluidized by the gas B in the second fluidizing zone 7, and then enter the third fluidizing zone 8 through the lower overflow port 11 to be fluidized by the gas B. A discharge port 9 is provided on the third fluidizing zone 8, and the discharge port 9 is located at the material layer position. The material particles in the third fluidizing zone 8 are discharged through the discharge port.

[0031] In order to achieve uniform arrangement of fluidizing air and improve the fluidization effect of material particles, air distribution plates 12 are provided in the first fluidizing zone 6, the second fluidizing zone 7 and the third fluidizing zone 8. Air distribution holes are evenly provided on the air distribution plates, and gas A and gas B respectively pass through the air distribution holes on the air distribution plates to fluidize the material particles.

[0032] Furthermore, a mixed gas outlet is provided at the top of the multi-chamber fluidized bed. Specifically, the mixed gas outlet is provided at the top of the connecting space between the first fluidizing zone 6 and the second fluidizing zone 7. The mixed exhaust gas generated by the first fluidizing zone 6 and the second fluidizing zone 7 is discharged through the mixed gas outlet.

[0033] The atmosphere-switching fluidized bed particle conveying device provided in this embodiment can output particles in a fluidized manner under different atmospheres. Compared with commonly used particle conveying devices, the particles are less susceptible to wear and extrusion, and are not easily broken or agglomerated. The interior of the fluidized bed is divided into three fluidized areas. Through the setting of the second fluidized area, the switching and transition of the particles from gas A to gas B atmosphere can be achieved. The particles are well sealed during conveying, and seamless connection can be achieved, and the particles will not come into contact with the external atmosphere.

[0034] Example 2

[0035] In a typical embodiment of the present invention, a fluidized bed particle conveying system is proposed, including the atmosphere switching fluidized bed particle conveying device of Example 1, the first fluidizing zone of the multi-chamber fluidized bed is connected to the first dryer 13, the third fluidizing zone is connected to the second dryer 14, the first fluidizing gas is the same as the drying gas used in the first dryer, and the second fluidizing gas is the same as the drying gas used in the second dryer.

[0036] To prevent gas in the multi-chamber fluidized bed 3 from leaking into the first dryer 13 and affecting the gas composition in the first dryer 13, the pressure in the first and second fluidized zones of the multi-chamber fluidized bed 3 is 0.02-2 kPa lower than that in the first dryer 13. To prevent gas in the second dryer 14 from flowing into the third fluidized zone of the multi-chamber fluidized bed 3, the pressure in the third fluidized zone is 0.02-2 kPa higher than that in the second dryer.

[0037] Furthermore, a first dry gas outlet is provided at the top of the first dryer 13, through which the gas A carrying moisture in the first dryer 13 is discharged; and a second dry gas outlet is provided at the top of the second dryer 14, through which the gas B carrying moisture in the second dryer is discharged.

[0038] The working principle of the fluidized bed particle conveying system provided in this embodiment is as follows:

[0039] The particles are dried and dehydrated in the first dryer 13 using gas A as the fluidizing air. The particles are discharged from the discharge overflow port (feed port 4) of the first dryer 13 and directly enter the first fluidizing zone 6 of the multi-chamber fluidized bed 3 for fluidization. The first fluidizing zone 6 uses gas A as the fluidizing air to maintain the fluidized motion of the particles. If the particles need to be kept at a certain temperature, the inlet temperature of the fluidizing gas A in zone A can be adjusted to maintain the particles at a certain temperature.

[0040] The particles pass through the upper overflow port 10 and enter the second fluidizing zone 7 for fluidization. The second fluidizing zone 7 uses gas B as the fluidizing air to maintain the fluidized motion of the particles and remove all gas A from the particles to prevent gas A from entering the second dryer 14 and affecting the dehydration gas atmosphere of the particles in the second dryer 14. If the particles need to maintain a certain temperature, the inlet temperature of the fluidizing gas B in the second fluidizing zone 7, the third fluidizing zone 8, and the second fluidizing zone 7 can be adjusted to maintain the particle temperature.

[0041] The particles finally enter the third fluidized zone 8 from the lower overflow port 11. There is no gas A in the third fluidized zone 8, and only the particles are fluidized in the gas B. Finally, the particles enter the second dryer 14 from the discharge port of the third fluidized zone 8 and continue to remove the remaining moisture in the gas B atmosphere.

[0042] The first fluidized zone 6 of the multi-chamber fluidized bed 3 is fluidized using the same gas A as the first dryer 13. The second and third fluidized zones 7 and 8 are fluidized using the same gas B as the second dryer 14. The fluidized bed pressures in the first and second fluidized zones 6 and 7 are 0.02-2 kPa lower than the pressure in the first dryer 13. This prevents gas from leaking from the multi-chamber fluidized bed 3 into the first dryer 13 and affecting the gas composition therein. A small amount of gas A enters the multi-chamber fluidized bed 3 from the first dryer 13 and is discharged from the top of the multi-chamber fluidized bed along with the mixed exhaust gases A and B. The pressure in the third fluidized zone 8 of the multi-chamber fluidized bed is slightly higher than that in the second dryer to prevent gas B from flowing from the second dryer 14 into the third fluidized zone 8 and affecting the fluidization of particles therein. The mixed tail gas from the multi-chamber fluidized bed 3 contains gases A and B, which need to be separated or lost as waste gas, while the tail gas discharged from the first dryer and the second dryer can be directly recycled after dehydration.

[0043] Example 3

[0044] In a typical embodiment of the present invention, a fluidized bed particle conveying process is proposed, comprising:

[0045] After the granular material is dried by the first fluidizing gas from the first dryer, the discharge directly enters the first fluidizing zone of the multi-chamber fluidized bed, is fluidized under the action of the first fluidizing gas, enters the second fluidizing zone from the top of the first partition, is fluidized by the second fluidizing gas in the second fluidizing zone, and all the first fluidizing gas in the particles is removed. The particles then enter the third fluidizing zone from the bottom of the second partition, and enter the second dryer from the discharge port of the third fluidizing zone.

[0046] Furthermore, the tail gas discharged from the first dryer and the second dryer is recycled after being dehydrated.

[0047] Taking the transportation of magnesium chloride particles between an air dryer and a hydrogen chloride dryer as an example, the implementation process is as follows:

[0048] (1) The magnesium chloride particles are dried and dehydrated in an air dryer using hot air as the fluidizing air. The moisture content of the particles is 2 mol and the discharge temperature is 160°C. The magnesium chloride particles are discharged from the discharge overflow port (feed port 4) of the air dryer and directly enter the first fluidizing zone of the multi-chamber fluidized bed 3 for fluidization. The first fluidizing zone uses 160°C hot air as the fluidizing air to maintain the fluidization motion of the particles and the particle temperature. The magnesium chloride particles pass through the upper overflow port 10 and enter the second fluidizing zone for fluidization. The second fluidizing zone uses 160°C hydrogen chloride gas as the fluidizing air to maintain the fluidization motion of the particles and the particle temperature. At the same time, all air in the particles is removed to prevent air from entering the hydrogen chloride dryer and affecting the gas atmosphere of the particles during hydrogen chloride drying and dehydration. The magnesium chloride particles finally enter the third fluidizing zone from the lower overflow port 11. There is no air in the third fluidizing zone. Only the magnesium chloride particles are fluidized in the hydrogen chloride gas. Finally, the particles enter the hydrogen chloride dryer from the discharge port of the third fluidizing zone and continue to remove the remaining moisture in the hydrogen chloride gas atmosphere.

[0049] (2) The air dryer uses air as a heat source to remove moisture from magnesium chloride particles. The first fluidized zone of the multi-chamber fluidized bed also uses 160°C hot air as fluidizing air to maintain the fluidized motion and temperature of the particles. The second and third fluidized zones of the multi-chamber fluidized bed use 160°C hydrogen chloride gas as fluidizing air. The tail gas from the first and second fluidized zones is mixed and discharged through the top air outlet of the multi-chamber fluidized bed. The tail gas needs to be washed by a scrubber to separate the hydrogen chloride gas from the air. The fluidizing air in the third fluidized zone is all hydrogen chloride gas, which enters the hydrogen chloride dryer with the particles and is discharged together with the tail gas from the hydrogen chloride dryer.

[0050] (3) the pressure at the top of the first fluidization zone and the second fluidization zone of the multi-chamber fluidized bed is 0.02-2 kPa lower than the pressure of the air dryer, so that hydrogen chloride gas in the multi-chamber fluidized bed is prevented from leaking into the air dryer and polluting the tail gas of the air dryer, and a small amount of air from the air dryer enters the top of the first fluidization zone and the second fluidization zone of the multi-chamber fluidized bed and is discharged from the top of the multi-chamber fluidized bed; the pressure of the third fluidization zone of the multi-chamber fluidized bed is slightly higher than the pressure of the hydrogen chloride dryer, so that hydrogen chloride is prevented from flowing from the hydrogen chloride dryer into the third fluidization zone of the multi-chamber fluidized bed and affecting the fluidization of magnesium chloride particles in the third fluidization zone.

[0051] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A fluidized bed particle conveying system, comprising an atmosphere switching fluidized bed particle conveying device, characterized in that: The atmosphere switching fluidized bed particle conveying device comprises a multi-chamber fluidized bed, wherein a first partition and a second partition are provided in the multi-chamber fluidized bed, and the multi-chamber fluidized bed is divided into a first fluidizing zone, a second fluidizing zone and a third fluidizing zone by the first partition and the second partition, wherein the upper spaces of the first fluidizing zone and the second fluidizing zone are connected, and the lower spaces of the second fluidizing zone and the third fluidizing zone are connected, the first fluidizing zone is fluidized by a first gas, and the second fluidizing zone and the third fluidizing zone are fluidized by a second gas, and the particles pass through the first, second and third fluidizing zones in sequence to realize the transportation of the particles under different atmospheres; the first fluidizing zone of the multi-chamber fluidized bed is connected to a first dryer, and the third fluidizing zone is connected to a second dryer, the first fluidizing gas is the same as the drying gas used by the first dryer, and the second fluidizing gas is the same as the drying gas used by the second dryer; The top of the first partition forms an upper overflow port, and the bottom of the second partition forms a lower overflow port; A mixed gas outlet is provided at the top of the multi-chamber fluidized bed; the mixed gas outlet is provided at the top of the communication space between the first fluidizing zone and the second fluidizing zone, and the mixed tail gas generated in the first fluidizing zone and the second fluidizing zone is discharged through the mixed gas outlet.

2. The fluidized bed particle conveying system according to claim 1, wherein: A feed port is provided at the upper portion of the first fluidized zone, and a first gas inlet is provided at the lower portion thereof. The height of the feed port is higher than the height of the material layer.

3. The fluidized bed particle conveying system according to claim 1, wherein: A second gas inlet is provided at the lower portion of the communication space between the second fluidizing zone and the third fluidizing zone, and a discharge port is provided on the third fluidizing zone, and the discharge port is located at the material layer position.

4. The fluidized bed particle conveying system according to claim 1, wherein: Air distribution plates are provided in the first fluidization zone, the second fluidization zone and the third fluidization zone, and air distribution holes are evenly provided on the air distribution plates.

5. The fluidized bed particle conveying system according to claim 1, wherein: The pressure in the first and second fluidized zones of the multi-chamber fluidized bed is 0.02-2 kPa lower than that in the first dryer, and the pressure in the third fluidized zone is 0.02-2 kPa higher than that in the second dryer.

6. The fluidized bed particle conveying system according to claim 5, characterized in that: A first drying gas outlet is provided on the top of the first dryer, and a second drying gas outlet is provided on the top of the second dryer.

7. A fluidized bed particle conveying process, implemented using the fluidized bed particle conveying system according to claim 6, characterized in that: include: After the granular material is dried by the first fluidizing gas from the first dryer, the discharge directly enters the first fluidizing zone of the multi-chamber fluidized bed, is fluidized under the action of the first fluidizing gas, enters the second fluidizing zone from the top of the first partition, is fluidized by the second fluidizing gas in the second fluidizing zone, and all the first fluidizing gas in the particles is removed. The particles then enter the third fluidizing zone from the bottom of the second partition, and enter the second dryer from the discharge port of the third fluidizing zone.

8. The fluidized bed particle conveying process according to claim 7, wherein: The tail gas discharged from the first dryer and the second dryer is recycled after dehydration, and the tail gas discharged from the multi-chamber fluidized bed is a mixed gas of the first fluidizing gas and the second fluidizing gas, which is recycled after separation treatment.

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