A thermal activation device for producing activated carbon

Abstract

The present invention relates to a thermal activation device for producing activated carbon, comprising a rotary furnace, wherein a flame jet device is provided at the front end of the furnace chamber of the rotary furnace, and a material discharge port is provided at the rear end; a plurality of spiral rotating plates are provided in the furnace chamber, the rotating plates are fixedly connected to the inner wall of the furnace chamber, and can rotate with the furnace chamber so that materials can move along the rotating plates; the plurality of rotating plates are evenly arranged along the central axis of the furnace chamber, the rotating plates are concentrically arranged with the furnace chamber, a collecting hood is provided on the downstream side of each rotating plate, an inclined material conveying pipe is provided on the downstream side of the collecting hood, the material conveying pipe points to the next adjacent rotating plate, and is used for collecting the material after heating and activation of the previous rotating plate and then feeding it into the next rotating plate for further heating; the flame jet device comprises a main flame jet port and a plurality of flame jet tubes, the plurality of flame jet tubes are evenly distributed along the circumference of the inner wall of the furnace chamber, and each flame jet tube is provided with an auxiliary flame jet port at the position corresponding to the opening on the upstream side of the rotating plate to supplement heating for each rotating plate.

Description

Technical Field

[0001] The invention belongs to the technical field of activated carbon production, and in particular relates to a thermal activation device for producing activated carbon. Background Art

[0002] Activated carbon is an important adsorption material. It is made by mixing organic raw materials with certain chemical reagents, aging them, forming them into a certain shape, and then heating them to activate them to reduce non-carbon components. The surface of the activated carbon is eroded, resulting in countless tiny pores on the surface of the activated carbon, creating a well-developed microporous structure. This process is called activation. Activated carbon has a huge surface area. The surface area of ​​each gram of activated carbon is about 500-1500m 2 , with good adsorption properties, activated carbon is widely used in sewage or waste gas treatment. The heating activation step of activated carbon is very important. At present, rotary kilns are commonly used for activation. However, the thermal efficiency of rotary kilns is low, and the heat field in the furnace is uneven, which affects the full activation of activated carbon. Summary of the Invention

[0003] In response to the above problems, the present invention provides a thermal activation device for producing activated carbon, comprising a rotary kiln, wherein a flame jet device is provided at the front end of the furnace of the rotary kiln, and a discharge port is provided at the rear end of the furnace. The flame jet device is connected to a burner outside the furnace to provide a hot flame in the furnace to heat and activate the activated carbon.

[0004] The furnace is equipped with several spiral rotating plates, which are fixedly connected to the inner wall of the furnace and can rotate with the furnace, so that the material can move along the rotating plates; the rotating plates are evenly arranged along the central axis of the furnace, and the rotating plates are concentrically arranged with the furnace. A collection cover is provided on the downstream side of each rotating plate, and an inclined material conveying pipe is provided on the downstream side of the collection cover. The material conveying pipe is directed to the next adjacent rotating plate, which is used to collect the material heated and activated by the previous rotating plate and then convey it to the next rotating plate for further heating;

[0005] The flame jet device includes a main flame jet port and several flame jet tubes. The several flame jet tubes are evenly distributed along the circumference of the inner wall of the furnace. Each flame jet tube is provided with an auxiliary flame jet port at the position corresponding to the opening on the upstream side of the rotary plate to provide additional heating for each rotary plate.

[0006] Optionally, the furnace is a horizontal cylindrical shape, and the central axis of the furnace is horizontal;

[0007] The rear end of the furnace is rotatably connected to the output pipe, which is arranged vertically. An exhaust port is provided at the top of the output pipe for discharging the exhaust gas in the furnace, and a discharge port is provided at the bottom of the output pipe for discharging the activated carbon after activation in the furnace.

[0008] Optionally, the flame jet device includes a main pipe, a main flame jet port, and a plurality of flame jet tubes, one end of the main pipe passes through the front end of the furnace and is connected to an external burner, and the other end is provided with a main flame jet port to provide flame and heat to the rotary plate closest to the front end of the furnace;

[0009] The feeding device outside the furnace is connected to the main pipe through the feeding pipe, and the raw materials are fed into the main pipe, and then enter the furnace with the flame;

[0010] The flame tube is fixed on the horizontal curved inner wall of the furnace. The front part of the flame tube is inclined and passes through the furnace to connect to the main pipe, and the rear part of the flame tube is horizontal.

[0011] The flame spraying device as a whole can rotate synchronously with the furnace.

[0012] Further optionally, the flame tube is provided with a flame splitter tube inclined downward or upward at the front end of each rotating plate, the flame splitter tube is inclined toward the corresponding rotating plate, and the bottom end of the flame splitter tube is provided with an auxiliary flame port to provide additional heating for the corresponding rotating plate.

[0013] Optionally, the revolving plate is arranged horizontally with both ends open to allow materials to enter and exit; the central axis of the revolving plate coincides with the central axis of the furnace, and the revolving plate is a spiral plate structure that surrounds the layers from the inside to the outside, and the intervals between adjacent layers are equal, so that the material can continue to roll between layers along the inner wall surface of the revolving plate, that is, the distance between the material and the central axis of the revolving plate is continuously changed.

[0014] Further optionally, the outermost outer wall of the revolving plate is connected to the inner wall of the furnace through at least one connecting rod, so as to fix the position of the revolving plate in the furnace.

[0015] Optionally, the collecting hood is in the shape of an oblique cone, with a vertical circular bottom surface, which is concentrically arranged with the furnace and directly faces the downstream end of the mating rotary plate, and the diameter of the circular bottom surface is equal to the diameter of the outermost layer of the corresponding rotary plate, so that the materials in the rotary plate can all enter the collecting hood; the tip of the collecting hood is inclined and directly faces the upstream end of the next rotary plate;

[0016] The tip of the collecting cover is connected to the material conveying pipe, and the bottom end of the material conveying pipe extends into the front end of the next rotary plate, so that the material in the collecting cover is conveyed to the next rotary plate through the material conveying pipe.

[0017] Further optionally, the outer wall of the collecting hood is connected to the inner wall of the furnace through at least one secondary connecting rod, which is used to fix the position of the collecting hood in the furnace, and the collecting hood can rotate synchronously with the furnace;

[0018] Several layers of guide vanes are evenly arranged on the inner wall of the collecting hood and the inner wall of the conveying pipe. The guide vanes protrude into the collecting hood and the conveying pipe to facilitate the movement of materials along the guide vanes inside the collecting hood and the conveying pipe and finally enter the next rotary plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the thermal activation device for producing activated carbon;

[0020] Figure 2 is a three-dimensional schematic diagram of the thermal activation device for producing activated carbon;

[0021] Figure 3 It is a side view schematic diagram of the rear end of the furnace.

[0022] In the accompanying drawings, 1-furnace, 2-feed pipe, 3-rotating plate, 4-collecting hood, 5-conveying pipe, 6-main flame nozzle, 7-auxiliary flame nozzle, 8-flame tube, 9-output pipe, 10-exhaust port, 11-discharge port, 12-main pipe, 13-split flame tube. DETAILED DESCRIPTION

[0023] This embodiment provides a thermal activation device for producing activated carbon, such as Figure 1-Figure 3 As shown, a rotary kiln is provided, wherein a flame jet device is provided at the front end of the furnace 1 of the rotary kiln, and a discharge port 11 is provided at the rear end of the furnace 1. The flame jet device is connected to a burner outside the furnace 1 to provide a hot flame inside the furnace 1 to heat and activate the activated carbon.

[0024] A plurality of spiral rotating plates 3 are provided in the furnace 1. The rotating plates 3 are fixedly connected to the inner wall of the furnace 1 and can rotate with the furnace 1, so that the material can move along the rotating plates 3. The plurality of rotating plates are evenly arranged along the central axis of the furnace 1. The rotating plates 3 are arranged concentrically with the furnace 1. A collection cover 4 is provided on the downstream side of each rotating plate. An inclined material conveying pipe 5 is provided on the downstream side of the collection cover 4. The material conveying pipe 5 points to the next adjacent rotating plate and is used to collect the material heated and activated by the previous rotating plate and then convey it to the next rotating plate for further heating.

[0025] The flame jet device includes a main flame jet port 6 and several flame jet tubes 8. The several flame jet tubes are evenly distributed along the circumference of the inner wall of the furnace 1. Each flame jet tube is provided with an auxiliary flame jet port 7 at the position of the opening on the upstream side of the rotating plate 3 to provide additional heating for each rotating plate.

[0026] The rotary kiln is provided with a support device and a rotation drive device on the outside. The support device and the rotation drive device are the same as those of existing rotary kilns and have the same operating mechanism, which only needs to ensure that the furnace 1 of the rotary kiln can rotate forward and reverse smoothly. The furnace 1 is provided with an insulation layer on the outside.

[0027] Optionally, the furnace 1 is a horizontal cylindrical shape, and the central axis of the furnace 1 is horizontal;

[0028] The rear end of the furnace 1 is rotatably connected to the output pipe 9, which is arranged vertically. The top of the output pipe 9 is provided with an exhaust port 10 for discharging the exhaust gas in the furnace 1, and the bottom of the output pipe 9 is provided with a discharge port 11 for discharging the activated carbon in the furnace 1.

[0029] Optionally, the flame jet device includes a main pipe 12, a main flame jet port 6 and a plurality of flame jet tubes 8, one end of the main pipe 12 passes through the front end of the furnace and is connected to an external burner, and the other end is provided with a main flame jet port 6 to provide flame and heat to the rotary plate 3 closest to the front end of the furnace;

[0030] The feeding device outside the furnace is connected to the main pipe 12 through the feeding pipe, and the raw materials are fed into the main pipe 12, and then enter the furnace with the flame;

[0031] The flame tube 8 is fixed on the horizontal curved inner wall of the furnace. The front portion of the flame tube 8 is inclined and passes through the furnace 1 to connect with the main pipe 12. The rear portion of the flame tube 8 is horizontal.

[0032] The flame spraying device as a whole can rotate synchronously with the furnace.

[0033] Further optionally, the flame tube 8 is provided with a flame splitter tube 13 inclined downward or upward at the position corresponding to the front end of each rotating plate, and the flame splitter tube 13 is inclined toward the corresponding rotating plate. The bottom end of the flame splitter tube 13 is provided with an auxiliary flame port 7 to provide additional heating for the corresponding rotating plate 3.

[0034] In one specific embodiment, the feed pipe 2 feeds activated carbon to be activated into the main pipe via the feed pipe 2. Flames from the main pipe 12 and the main jet nozzle 6 spray the activated carbon from the main pipe toward the feed pipe 2 located closest to the rotary plate. The front end of each jet nozzle is connected to the main pipe, allowing the heat from the flame delivered by the main pipe to also enter the jet nozzle. Each jet nozzle is equipped with a valve to control its use, and each sub-pipe is equipped with a valve to control its use. The front ends of both the feed pipe 2 and the jet nozzle are connected to the main pipe, with the jet nozzle closer to the furnace and the rear end of the jet nozzle closed.

[0035] The front end (upstream side) of the rotating plate 3 corresponds to several flame-dividing tubes 13 and auxiliary flame ports 7. The distances between each auxiliary flame port and the front end of the rotating plate are the same. The inclination angles of the flame-dividing tubes 13 can be the same or different, so that the auxiliary flame ports 7 correspond to different layers of the same rotating plate 3. Preferably, a circle of auxiliary flame ports 7 is arranged in a clockwise or counterclockwise direction, corresponding to each layer of the rotating plate 3 from the inside to the outside, so that no matter which layer of the rotating plate 3 the material rolls to, there is at least one auxiliary flame port facing the layer, which facilitates the auxiliary flame ports 7 to spray the material in the rotating plate 3 to the corresponding collecting hood 4.

[0036] Optionally, the revolving plate 3 is arranged horizontally with both ends open to allow materials to enter and exit; the central axis of the revolving plate 3 coincides with the central axis of the furnace 1, and the revolving plate 3 is a spiral plate structure that is surrounded layer by layer from the inside to the outside, and the intervals between adjacent layers are equal, so that the material can continue to roll between layers along the inner wall surface of the revolving plate 3, that is, the distance between the material and the central axis of the revolving plate 3 is continuously changed.

[0037] Further optionally, the outermost outer wall of the revolving plate 3 is connected to the inner wall of the furnace through at least one connecting rod, so as to fix the position of the revolving plate 3 in the furnace;

[0038] The length and height of each rotary plate are the same, and the layer spacing of different rotary plates can be the same or different. According to the activation of the material in the furnace, the layer spacing of each rotary plate is adjusted to extend the residence time of the material in the rotary plate.

[0039] Optionally, the collecting hood 4 is in an oblique conical shape, with a vertical circular bottom surface, which is concentrically arranged with the furnace 1 and directly opposite to the downstream end of the rotary plate 3. The diameter of the circular bottom surface is equal to the diameter of the outermost layer of the corresponding rotary plate 3, so that the material in the rotary plate 3 can all enter the collecting hood 4; the tip of the collecting hood 4 is inclined and directly opposite to the upstream end of the next rotary plate;

[0040] The tip of the collecting cover 4 is connected to the feeding pipe 5 , and the bottom end of the feeding pipe 5 extends into the front end of the next rotary plate, so that the material in the collecting cover 4 is transported to the next rotary plate through the feeding pipe 5 .

[0041] Further optionally, the outer wall of the collecting hood 4 is connected to the inner wall of the furnace 1 through at least one secondary connecting rod, which is used to fix the position of the collecting hood 4 in the furnace, and the collecting hood 4 can rotate synchronously with the furnace;

[0042] Several layers of guide vanes are evenly arranged on the inner wall of the collecting hood 4 and the inner wall of the conveying pipe 5. The guide vanes protrude into the collecting hood and the conveying pipe to facilitate the movement of materials along the guide vanes inside the collecting hood and the conveying pipe and finally enter the next rotary plate.

[0043] The main jet 6 provides heat and raw materials to the first rotating plate on the upstream side of the furnace. At this time, all the auxiliary jets 7 of the jet pipe 8 are inactive. As the first rotating plate rotates with the furnace, material rolls between the layers of the first rotating plate, for example, rolling from the outermost layer to the innermost layer, and then from the innermost layer to the outermost layer. During this period, the main jet 6 may or may not be emitting flames. After a period of time, the material in the first rotating plate rolls to the innermost layer (i.e., closest to the center of the rotating plate), and the main jet 6 emits flames, spraying the material from the first rotating plate into the corresponding collection hood on the downstream side. At this point, the tip of the collection hood and the feed pipe are both tilted downward, and the feed pipe transports the material to the upstream end of the second rotating plate. At this point, the main pipe 12 can feed material to the first rotating plate again. While the main jet 6 is emitting flames to the first rotating plate, the auxiliary jets at the front end of the second rotating plate are also emitting flames to the second rotating plate to provide heat. There is no restriction on which layer of the next rotary plate the feed pipe corresponds to. It can correspond to the outer or inner layer of the rotary plate. The first batch of materials is activated and processed in the second rotary plate, and the second batch of materials is activated and processed in the first rotary plate.

[0044] After a period of time, the material in the second rotary plate rolls to the innermost layer (i.e., closest to the center of the rotary plate), and the secondary flame nozzle corresponding to this layer sprays the material into the corresponding collection hood on the downstream side, and then transports it to the third rotary plate. The second batch of material in the first rotary plate is also input into the corresponding collection hood at the same time, and then transported to the second rotary plate. This is repeated, and each batch of material is heated and activated by all the rotary plates in turn, and finally discharged from the furnace through the discharge port 11. During the heating and activation treatment of the material, it is best that the furnace rotates all the time, and the feed pipe and the feed device can be connected through a rotating interface, that is, when the front end of the feed pipe rotates to the opening of the feed device, it can be quickly docked and fed. After rotating past this position, it is not docked and no feeding occurs.

[0045] The furnace of a traditional rotary furnace consists of a single, hollow chamber. Flames are injected at the front of the furnace to heat and activate the material. This results in a highly uneven temperature field within the furnace, leading to uneven activation of the material and varying product quality. The material also typically rotates widely within the furnace, increasing the probability of material impact and breakage. The present invention radically transforms the traditional rotary furnace structure. By utilizing a number of evenly spaced rotating plates (3), the material can be heated and activated in batches and segments, without interfering with each other. The rotating plates (3) themselves are spiral-shaped and rotate synchronously with the furnace (1). The material continuously rolls within the plates, extending its residence time. The corresponding secondary flame ports (7) also provide targeted heat replenishment to the material, improving heat utilization. The material rolls along the inner wall of the rotating plates (3), with minimal rotation, ensuring a smooth rolling process and maintaining the activated carbon's morphology. The segmented rotating plates design allows for controllable activation of the activated carbon. Furthermore, the flame tubes (8) on the inner wall of the furnace also dissipate heat, providing a relatively uniform heating layer throughout the furnace.

Claims

1. A thermal activation device for producing activated carbon, characterized in that, The rotary kiln comprises a flame spraying device at the front end of the furnace and a discharge port at the rear end of the furnace. The flame spraying device is connected to a burner outside the furnace to provide hot flames in the furnace to heat and activate the activated carbon. The furnace is equipped with several spiral rotating plates, which are fixedly connected to the inner wall of the furnace and can rotate with the furnace, so that the material can move along the rotating plates; the rotating plates are evenly arranged along the central axis of the furnace, and the rotating plates are concentrically arranged with the furnace. A collection cover is provided on the downstream side of each rotating plate, and an inclined material conveying pipe is provided on the downstream side of the collection cover. The material conveying pipe is directed to the next adjacent rotating plate, which is used to collect the material heated and activated by the previous rotating plate and then convey it to the next rotating plate for further heating; The flame jet device includes a main flame jet port and several flame jet tubes. The several flame jet tubes are evenly distributed along the circumference of the inner wall of the furnace. Each flame jet tube is provided with an auxiliary flame jet port at the position corresponding to the opening on the upstream side of the rotary plate to provide additional heating for each rotary plate.

2. The thermal activation device for producing activated carbon according to claim 1, characterized in that The furnace is a horizontal cylindrical shape, and the central axis of the furnace is horizontal; The rear end of the furnace is rotatably connected to the output pipe, which is arranged vertically. An exhaust port is provided at the top of the output pipe for discharging the exhaust gas in the furnace, and a discharge port is provided at the bottom of the output pipe for discharging the activated carbon after activation in the furnace.

3. The thermal activation device for producing activated carbon according to claim 1, characterized in that The flame spray device includes a main pipe, a main flame spray port and a plurality of flame spray tubes. One end of the main pipe passes through the front end of the furnace and is connected to the external burner. The other end is provided with a main flame spray port to provide flame and heat to the rotary plate closest to the front end of the furnace. The feeding device outside the furnace is connected to the main pipe through the feeding pipe, and the raw materials are fed into the main pipe, and then enter the furnace with the flame; The flame tube is fixed on the horizontal curved inner wall of the furnace. The front part of the flame tube is inclined and passes through the furnace to connect to the main pipe, and the rear part of the flame tube is horizontal. The flame spraying device as a whole can rotate synchronously with the furnace.

4. The thermal activation device for producing activated carbon according to claim 3, characterized in that The flame tube is provided with a flame splitter tube inclined downward or upward at the front end of each rotating plate, and the flame splitter tube is inclined toward the corresponding rotating plate. The bottom end of the flame splitter tube is provided with an auxiliary flame port to supplement heating for the corresponding rotating plate.

5. The thermal activation device for producing activated carbon according to claim 1, characterized in that The rotating plate is arranged horizontally with both ends open to allow materials to enter and exit; the central axis of the rotating plate coincides with the central axis of the furnace, and the rotating plate is a spiral plate structure that surrounds the layers from the inside to the outside. The intervals between adjacent layers are equal, so that the material can continue to roll between layers along the inner wall surface of the rotating plate, constantly changing the distance between the material and the central axis of the rotating plate.

6. The thermal activation device for producing activated carbon according to claim 5, characterized in that The outermost outer wall of the revolving plate is connected to the inner wall of the furnace through at least one connecting rod, so as to fix the position of the revolving plate in the furnace.

7. The thermal activation device for producing activated carbon according to claim 5, characterized in that The collecting hood is in the shape of an oblique cone, with a vertical circular bottom surface, which is concentrically arranged with the furnace and directly faces the downstream end of the docking rotary plate. The diameter of the circular bottom surface is equal to the diameter of the outermost layer of the corresponding rotary plate, so that the material in the rotary plate can all enter the collecting hood; the tip of the collecting hood is inclined and directly faces the upstream end of the next rotary plate.

8. The thermal activation device for producing activated carbon according to claim 7, characterized in that The tip of the collecting cover is connected to the feeding pipe, and the bottom end of the feeding pipe extends into the front end of the next rotary plate, so that the material in the collecting cover is transported to the next rotary plate through the feeding pipe.

9. The thermal activation device for producing activated carbon according to claim 8, characterized in that The outer wall of the collecting hood is connected to the inner wall of the furnace through at least one auxiliary connecting rod, which is used to fix the position of the collecting hood in the furnace, and the collecting hood can rotate synchronously with the furnace; Several layers of guide vanes are evenly arranged on the inner wall of the collecting hood and the inner wall of the conveying pipe. The guide vanes protrude into the collecting hood and the conveying pipe to facilitate the movement of materials along the guide vanes inside the collecting hood and the conveying pipe and finally enter the next rotary plate.

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