A green method and apparatus for the modification of activated carbon

Abstract

The application relates to the technical field of activated carbon preparation, in particular to a green preparation method and device of modified activated carbon. The preparation device comprises a base, a carbonization assembly and an activation assembly. Raw materials for activated carbon preparation are carbonized by the carbonization assembly, transferred to a transfer cavity and transported into an inner cylinder by a spiral conveying piece to be activated. According to the carbonization and activation temperature characteristics, the two processes are coaxially combined. On the basis of ensuring the uniform temperature distribution of the two processes, the heat source is integrated, the heat loss is effectively reduced, the automatic switching of the two processes is realized by the transfer cavity, the process transfer labor and equipment investment are reduced, compared with the prior art which only realizes the process switching by changing the processing conditions, the application also has the continuity of processing and high automation degree.

Description

Technical Field

[0001] This invention relates to the field of activated carbon preparation technology, and in particular to a green preparation method and apparatus for modified activated carbon. Background Technology

[0002] In the production process of activated carbon using bark particles as raw materials, the raw materials need to be carbonized and activated sequentially. The two processes are similar but require different ambient temperatures and gas atmospheres. In the existing technology, corresponding carbonization furnaces and activation furnaces are set up for step-by-step processing. This not only increases the required area for transfer steps and the space required for use, but also causes heat redundancy and increases production costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a green preparation method and apparatus for modified activated carbon, which has the advantages of being more energy-saving and environmentally friendly.

[0004] In a first aspect, the present invention provides an apparatus for preparing modified activated carbon, comprising a base, a carbonization component, and an activation component; the carbonization component includes a fixed cylinder, a rotating cylinder, a top plate, a spiral plate, and a first drive component; the activation component includes an inner cylinder and a spiral conveyor; the base has a transfer chamber; the fixed cylinder is inclinedly disposed on the base; an outlet is provided on the side wall of the fixed cylinder located within the transfer chamber; the spiral plate is coaxially disposed within the rotating cylinder and one side of the spiral plate is fixedly connected to the inner side wall of the rotating cylinder; one side of the rotating cylinder is rotatably disposed within the fixed cylinder; the bottom of the spiral plate is inserted into the fixed cylinder and corresponds to the outlet; the first drive component is connected to the rotating cylinder and drives it to rotate; the inner cylinder is coaxially disposed with the spiral plate and connected to the fixed cylinder. The bottom of the inner cylinder is fixedly connected, and the two ends of the inner cylinder extend from the bottom of the fixed cylinder and the top of the rotary cylinder, respectively. The top plate is fixed to the outer ring of the inner cylinder and rotatably connected to the top of the rotary cylinder. The screw conveyor is located inside the inner cylinder. One end of the screw conveyor is fixed to the top of the inner cylinder, and the other end of the screw conveyor extends from the bottom of the inner cylinder and enters the transfer chamber. The top plate has an inlet for feeding the screw plate, and the top of the inner cylinder has an outlet. The inner walls of the inner cylinder, the rotary cylinder, and the fixed cylinder are all surrounded by heating pipes. The fixed cylinder is connected to an air inlet pipe, and the inner cylinder is connected to an air inlet pipe. The raw materials for activated carbon preparation are carbonized by the carbonization component, reach the transfer chamber, and are transported to the inner cylinder by the screw conveyor for activation.

[0005] Furthermore, the preparation device also includes an upper-dispatch assembly. The transfer cavity is semi-cylindrical. The upper-dispatch assembly includes a second drive assembly, a rotating rod, a connecting rod, and baffles. Two second drive assemblies are respectively located on both sides of the transfer cavity. The rotating rod is located inside the transfer cavity. The second drive assembly passes through the side wall of the transfer cavity and is connected to the rotating rod. The connecting rod is located on the rotating rod near one end of the transfer cavity. Several baffles are fixedly connected to the connecting rod and are inclined radially along the transfer cavity. When the rotating rod is started to rotate, the baffles pass through the outlet and the spiral conveyor, thereby achieving particle distribution in the transfer cavity.

[0006] Furthermore, several baffles are arranged parallel to the connecting rod, and a movable plate is provided between adjacent baffles. One side of the movable plate is rotatably connected to one of the baffles and its rotatable angle is no more than 90°. When the rotating rod approaches the screw conveyor, the angle between the movable plate and the baffle is the largest; when the rotating rod moves away from the screw conveyor, the angle between the movable plate and the baffle is the smallest.

[0007] Furthermore, the top of the base is symmetrically provided with two arc-shaped slide rails, the second drive assembly is located in the middle of the rotating rod, and the other end of the rotating rod is provided with a roller. The other end of the rotating rod passes through the top of the base and causes the roller to abut against the slide rail.

[0008] Furthermore, the upper push assembly also includes a rebound group, which mainly consists of two rebound rods. One end of the rebound rod is provided with a roller, and the other ends of the two rebound rods are rotatably connected and sleeved on the connecting rod. A return spring is provided at the connection of the two rebound rods, and the return spring provides a force to the roller on the rebound rod against the inner wall of the central rotation cavity.

[0009] Furthermore, the first air inlet pipe is located on the side wall of the fixed cylinder and is used to transport nitrogen; the second air inlet pipe is located on the side wall of the inner cylinder and is located above the top plate, and is used to transport carbon dioxide.

[0010] Furthermore, the first drive assembly includes a gear ring and a gear set, the gear set being fixed to the side wall of the fixed cylinder, and the gear ring being disposed around the outer ring of the rotating cylinder and meshing with the gear set for transmission.

[0011] Furthermore, a protrusion is provided on the side of the baffle near the movable plate.

[0012] Secondly, the present invention provides a green preparation method for modified activated carbon, based on the above-described apparatus for preparing modified activated carbon, with the following specific steps:

[0013] S1: Nitrogen gas is introduced into the first inlet pipe of the preparation device to displace the oxygen in the device, and then the second inlet pipe is started to deliver carbon dioxide into the inner cylinder, so that the gas delivery speed in the second inlet pipe is not lower than the gas delivery speed in the second inlet pipe.

[0014] S2: The bark particles enter the preparation device from the inlet. The heating temperature inside the fixed cylinder and the rotating cylinder is set to 800 degrees Celsius, and the heating temperature inside the inner cylinder is set to 850 degrees Celsius. The rotation speed of the rotating cylinder is set so that the bark particles move along the spiral plate for no less than 2 hours to achieve carbonization of the bark particles.

[0015] S3: The carbonized bark particles accumulate in the transfer chamber and enter the inner cylinder under the rotation of the screw conveyor. The rotation speed of the screw conveyor is controlled so that the carbonized bark particles are transported along the screw conveyor for 0.5h-2h, thus realizing the first activation of the bark particles.

[0016] S4: Collect the first activated bark particles discharged from outlet two and cool them to room temperature. After washing and drying, spray them with hydrochloric acid for secondary activation. Finally, dry them again to obtain the finished modified activated carbon.

[0017] Furthermore, the concentration of the hydrochloric acid is between 0.5 mol / L and 1.5 mol / L.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are:

[0019] 1. Based on the characteristics of carbonization and activation temperatures, this invention enables the coaxial merging of two processes; while ensuring uniform temperature distribution in both processes, it integrates heat sources, effectively reducing heat loss; and utilizes a transfer chamber to achieve automatic switching between the two processes, reducing manual labor and equipment investment in process transfer. Compared with existing technologies that rely solely on changes in processing conditions to achieve process switching, this invention also ensures continuous processing and a high degree of automation.

[0020] 2. This invention achieves the distribution and arrangement of carbonized bark particles in the transfer chamber by setting up an upward-pushing component, thereby meeting the spatial allocation and distribution required for the automated operation of the activation and carbonization components and improving the overall automation of the equipment; by setting up a movable plate with a limited rotation angle, the amount of interception by the baffle changes with the direction of movement of the baffle, which can better adapt to the needs of unilateral accumulation in the device; by setting up an arc-shaped slide rail on the outer ring, the force point of the rotating rod during the upward-pushing process is increased, and in conjunction with the rebound group, the swing stability of the rotating rod in the transfer chamber is improved.

[0021] 3. Based on the characteristics of activated carbon after activation by the preparation device, this invention sets the carbonization and activation temperature and time. At the same time, in order to further increase the adsorption capacity of activated carbon, hydrochloric acid of corresponding concentration is sprayed for secondary activation and modification, which greatly improves the adsorption effect of activated carbon.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0023] Undoubtedly, such and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and figures.

[0024] To make the above and other objects, features and advantages of the present invention more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0026] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.

[0028] Figure 1 This is a side view of a modified activated carbon preparation apparatus according to the present invention, including a portion of its internal structure;

[0029] Figure 2 This is a schematic diagram of the overall structure of a modified activated carbon preparation device according to the present invention;

[0030] Figure 3 This is a schematic diagram of the base portion of the apparatus for preparing modified activated carbon according to the present invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the activation component and carbonization component of the apparatus for preparing modified activated carbon according to the present invention.

[0032] Figure 5 This is a schematic diagram of the separation structure of the rotary drum and the fixed drum in the apparatus for preparing modified activated carbon according to the present invention;

[0033] Figure 6 This is a schematic diagram of the upper assembly structure of a modified activated carbon preparation device according to the present invention;

[0034] Figure 7 This is a side view of the upper assembly of a modified activated carbon preparation apparatus according to the present invention;

[0035] Figure 8 This is a schematic diagram of the baffle structure of a modified activated carbon preparation device according to the present invention.

[0036] Explanation of key figure labels:

[0037] 1-Base;

[0038] 11-Transfer chamber; 12-Slide rail;

[0039] 2-Carbonized components;

[0040] 21-Fixed cylinder; 211-Outlet 1; 22-Rotating cylinder; 23-Top plate; 231-Inlet 1; 24-Spiral plate; 25-First drive assembly; 26-Inlet pipe 1;

[0041] 3-Activation components;

[0042] 31-Inner cylinder; 311-Outlet 2; 32-Screw conveyor; 33-Inlet pipe 2;

[0043] 4-Upward component;

[0044] 41-Second drive assembly; 42-Rotor; 43-Connecting rod; 44-Baffle; 441-Moving plate; 442-Protrusion; 45-Roller 1; 46-Rebound assembly; 461-Rebound rod. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0046] Reference Figure 1-8 In a first aspect, the present invention provides an apparatus for preparing modified activated carbon, comprising a base 1, a carbonization component 2, and an activation component 3.

[0047] The base 1 has a transfer cavity 11 inside. The transfer cavity 11 is semi-cylindrical, and the arc surface of the semi-cylindrical shape is the bottom of the transfer cavity 11.

[0048] The carbonization assembly 2 includes a fixed cylinder 21, a rotating cylinder 22, a top plate 23, a spiral plate 24, and a first drive assembly 25. The fixed cylinder 21 is inclinedly disposed on the base 1, so that the bottom part of the fixed cylinder 21 is located in the transfer cavity 11, and an outlet 211 is provided on the side wall of the fixed cylinder 21 placed in the transfer cavity 11. The spiral plate 24 is coaxially disposed in the rotating cylinder 22, and one side of it is fixedly connected to the inner side wall of the rotating cylinder 22. The rotation of the spiral plate 24 is achieved by controlling the rotation of the rotating cylinder 22. One side of the rotating cylinder 22 is rotatably disposed in the fixed cylinder 21, and the bottom of the spiral plate 24 is inserted into the fixed cylinder 21 and corresponds to the outlet 211. The first drive assembly 25 is connected to the rotating cylinder 22 and drives its rotation. The first drive assembly 25 includes a gear ring and a gear set. The gear set is fixed to the side wall of the fixed cylinder 21, and the gear ring is disposed around the outer ring of the rotating cylinder 22 and meshes with the gear set for transmission.

[0049] The activation component 3 includes an inner cylinder 31 and a spiral conveyor 32. The inner cylinder 31 is coaxially arranged with the spiral plate 24 and fixedly connected to the bottom of the fixed cylinder 21, that is, the spiral plate 24 is spirally arranged along the outer ring of the inner cylinder 31. The two ends of the inner cylinder 31 extend from the bottom of the fixed cylinder 21 and the top of the rotary cylinder 22, respectively. The top plate 23 is fixed to the outer ring of the inner cylinder 31 and rotatably connected to the top of the rotary cylinder 22, that is, the top plate 23 forms the top of the rotary cylinder 22. The top plate 23 is provided with an inlet 231 for feeding material into the spiral plate 24. The spiral conveyor 32 is located inside the inner cylinder 31 and is used to convey the carbonized bark material upward. Therefore, one end of the spiral conveyor 32 is provided with a third drive assembly fixed to the top of the inner cylinder 31 to drive its rotation, and the other end of the spiral conveyor 32 extends from the bottom of the inner cylinder 31 and extends into the transfer cavity 11. The inner cylinder 31 has an outlet 311 at its top and is connected to an inlet pipe 33. The inlet pipe 33 is located on the side wall of the inner cylinder 31 and is above the top plate 23. The inlet pipe 33 is used to transport carbon dioxide. The side wall of the fixed cylinder 21 has an inlet pipe 26, which is used to transport nitrogen. To achieve the corresponding temperatures and heat preservation for the two processes, heating pipes are arranged around the inner walls of the inner cylinder 31, the rotary cylinder 22, and the fixed cylinder 21. The raw materials used for activated carbon preparation are carbonized by the carbonization component 2 and then transported to the transfer chamber 11 by the screw conveyor 32 to the inner cylinder 31 for activation. It should be noted that because the carbonization component 2 and the activation component 3 are in an inclined state, during the heating process, most of the bark particles are in contact with one side of the fixed cylinder 21, the rotary cylinder 22, and the inner cylinder 31 to transfer heat.

[0050] To achieve a non-uniform distribution of particles within the transfer chamber 11, the preparation device further includes an upper drive assembly 4, which comprises a second drive assembly 41, a rotating rod 42, a connecting rod 43, and baffles 44. Two second drive assemblies 41 are respectively located on either side of the transfer chamber 11. The rotating rod 42 is located inside the transfer chamber 11, with the second drive assemblies 41 passing through the side wall of the transfer chamber 11 and connected to the rotating rod 42. The connecting rod 43 is located on the rotating rod 42 near one end of the transfer chamber 11. Several baffles 44 are fixedly connected to the connecting rod 43 and are radially inclined along the transfer chamber 11. Starting the rotating rod 42 causes the baffles 44 to pass through the outlet 211 and the spiral conveyor 32, achieving particle distribution within the transfer chamber 11. To achieve a non-uniform distribution, several baffles 44 are arranged parallel to the connecting rod 43, with adjacent baffles... A movable plate 441 is provided between 44. One side of the movable plate 441 is rotatably connected to a baffle 44 and its rotatable angle is no more than 90°. When the rotating rod 42 approaches the screw conveyor 32, the angle between the movable plate 441 and the baffle 44 is the largest. When the rotating rod 42 moves away from the screw conveyor 32, the angle between the movable plate 441 and the baffle 44 is the smallest. In order to ensure that the movable plate 441 can open under the push of the particles when it moves close to the screw conveyor 32, a protrusion 442 is provided on the side of the baffle 44 near the movable plate 441 to prevent the movable plate 441 from being tightly attached to the baffle 44.

[0051] To increase the stability of the rotation of the rotating rod 42, two arc-shaped slide rails 12 are symmetrically arranged on the top of the base 1. The second drive assembly 41 is located in the middle of the rotating rod 42. The other end of the rotating rod 42 is provided with a roller 45. The other end of the rotating rod 42 passes through the top of the base 1 and the roller 45 abuts against the slide rail 12. The upper push assembly 4 also includes a spring-loaded assembly 46, which is mainly composed of two spring-loaded rods 461. One end of the spring-loaded rod 461 is provided with a roller 2. The other ends of the two spring-loaded rods 461 are rotatably connected and sleeved on the connecting rod 43. A return spring is provided at the connection of the two spring-loaded rods 461. The return spring provides a force to the roller 2 on the spring-loaded rod 461 abutting against the inner wall of the central rotation cavity 11.

[0052] Secondly, the present invention provides a green preparation method for modified activated carbon, based on the above-described apparatus for preparing modified activated carbon, with the following specific steps:

[0053] S1: Nitrogen gas is introduced into the inlet pipe 26 of the preparation device to displace the total oxygen in the device. Then, the inlet pipe 33 is started to transport carbon dioxide into the inner cylinder 31. The gas transport speed in the inlet pipe 33 is not lower than that in the inner cylinder 31 to ensure that the carbonization component 2 and the activation component 3 are dominated by nitrogen and carbon dioxide gas, respectively. In actual operation, the gases in the two components will be partially mixed. Whether it is the carbonization component 2 mixed with carbon dioxide or the activation component 3 mixed with nitrogen, it can aggravate the corresponding physical or chemical reactions inside. To further increase the diffusion of the gas, the distance between the spiral plate 24 and the inner cylinder 31 and the distance between the spiral conveyor 32 and the inner cylinder 31 can be appropriately controlled; or the spiral plate 24 structure can be perforated and the spiral conveyor 32 can be perforated, etc., which will not be elaborated here.

[0054] S2: The bark particles are introduced into the preparation device through inlet 231. The heating temperature inside the fixed cylinder 21 and the rotating cylinder 22 is set to 800 degrees Celsius, and the heating temperature inside the inner cylinder 31 is set to 850 degrees Celsius. The rotation speed of the rotating cylinder 22 is set so that the bark particles move along the spiral plate 24 for no less than 2 hours to achieve carbonization of the bark particles.

[0055] S3: The carbonized bark particles accumulate in the transfer chamber 11 and enter the inner cylinder 31 under the rotation of the screw conveyor 32. The rotation speed of the screw conveyor 32 is controlled so that the carbonized bark particles are transported along the screw conveyor 32 for 0.5h-2h, realizing the first activation of the bark particles. The uniform discharge is achieved by adjusting the rotation speed of the rotary drum 22 and the screw conveyor 32.

[0056] S4: Collect the first-activated bark particles discharged from outlet 2 311 and allow them to cool to room temperature. After washing and drying, spray with hydrochloric acid for secondary activation, and finally dry again to obtain the finished modified activated carbon. The concentration of hydrochloric acid is 0.5mol / L-1.5mol / L.

[0057] Experimental calculations show that the prepared modified activated carbon has an adsorption capacity of 350-400 mg / g, and supports the adsorption of aldehydes, ketones, benzenes, and halogenated hydrocarbons under normal temperature and pressure conditions.

[0058] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0059] The term "embodiment" in this specification refers to a specific feature or characteristic described in connection with an embodiment that is included in at least one embodiment of the invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0060] Furthermore, the described features or characteristics can be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented without the aforementioned specific details or may be implemented using other methods, components, materials, etc.

Claims

1. An apparatus for preparing modified activated carbon, characterized in that, The device includes a base, a carbonization component, an activation component, and an upper conveyor component. The carbonization component includes a fixed cylinder, a rotating cylinder, a top plate, a spiral plate, and a first drive component. The activation component includes an inner cylinder and a spiral conveyor. The base has a transfer chamber. The fixed cylinder is inclinedly disposed on the base. The side wall of the fixed cylinder, which is located in the transfer chamber, has an outlet. The spiral plate is coaxially disposed in the rotating cylinder, and one side of the spiral plate is fixedly connected to the inner side wall of the rotating cylinder. One side of the rotating cylinder is rotatably disposed in the fixed cylinder. The bottom of the spiral plate is inserted into the fixed cylinder and corresponds to the outlet. The first drive component is connected to the rotating cylinder and drives it to rotate. The inner cylinder is coaxially arranged with the spiral plate and fixedly connected to the bottom of the fixed cylinder. The two ends of the inner cylinder extend from the bottom of the fixed cylinder and the top of the rotary cylinder, respectively. The top plate is fixed to the outer ring of the inner cylinder and rotatably connected to the top of the rotary cylinder. The spiral conveyor is located inside the inner cylinder. One end of the spiral conveyor has a third drive assembly fixed to the top of the inner cylinder. The other end of the spiral conveyor extends from the bottom of the inner cylinder and enters the transfer chamber. The top plate has an inlet for feeding the spiral plate. The top of the inner cylinder has an outlet. The inner walls of the inner cylinder, the rotary cylinder, and the fixed cylinder are all surrounded by heating pipes. The fixed cylinder is connected to an air inlet pipe, and the inner cylinder is connected to an air inlet pipe. The raw materials for activated carbon preparation are carbonized by the carbonization component, reach the transfer chamber, and are transported to the inner cylinder by the spiral conveyor for activation. The transfer chamber is semi-cylindrical. The upper push assembly includes a second drive assembly, a rotating rod, a connecting rod, and baffles. Two second drive assemblies are respectively located on both sides of the transfer chamber. The rotating rod is located inside the transfer chamber. The second drive assembly passes through the side wall of the transfer chamber and is connected to the rotating rod. The connecting rod is located on the rotating rod at one end near the transfer chamber. Several baffles are fixedly connected to the connecting rod and are inclined radially along the transfer chamber. When the rotating rod is started to rotate, the baffles pass through outlet one and the spiral conveyor, realizing the particle distribution in the transfer chamber.

2. The apparatus for preparing modified activated carbon according to claim 1, characterized in that, Several baffles are arranged parallel to the connecting rod, and a movable plate is provided between adjacent baffles. One side of the movable plate is rotatably connected to one of the baffles and its rotatable angle is no more than 90°.

3. The apparatus for preparing modified activated carbon according to claim 1, characterized in that, The base has two symmetrically arranged arc-shaped slide rails on its top. The second drive assembly is located in the middle of the rotating rod. The other end of the rotating rod is equipped with a roller. The other end of the rotating rod passes through the top of the base and makes the roller abut against the slide rail.

4. The apparatus for preparing modified activated carbon according to claim 3, characterized in that, The upper push assembly also includes a rebound group, which mainly consists of two rebound rods. One end of the rebound rod is provided with a roller, and the other ends of the two rebound rods are rotatably connected and sleeved on the connecting rod. A return spring is provided at the connection of the two rebound rods. The return spring provides a force to the roller on the rebound rod against the inner wall of the central rotation cavity.

5. The apparatus for preparing modified activated carbon according to claim 1, characterized in that, The first air inlet pipe is located on the side wall of the fixed cylinder and is used to transport nitrogen; the second air inlet pipe is located on the side wall of the inner cylinder and is located above the top plate and is used to transport carbon dioxide.

6. The apparatus for preparing modified activated carbon according to claim 1, characterized in that, The first drive assembly includes a gear ring and a gear set, the gear set being fixed to the side wall of the fixed cylinder, and the gear ring being encircled on the outer ring of the rotating cylinder and meshing with the gear set for transmission.

7. The apparatus for preparing modified activated carbon according to claim 2, characterized in that, The baffle has a protrusion on the side near the movable plate.

8. A green preparation method for modified activated carbon, characterized in that, The specific steps of the apparatus for preparing modified activated carbon according to any one of claims 1-7 are as follows: S1: Nitrogen gas is introduced into the first inlet pipe of the preparation device to displace the oxygen in the device, and then the second inlet pipe is started to deliver carbon dioxide into the inner cylinder; S2: The bark particles enter the preparation device from the inlet. The heating temperature inside the fixed cylinder and the rotating cylinder is set to 800 degrees Celsius, and the heating temperature inside the inner cylinder is set to 850 degrees Celsius. The rotation speed of the rotating cylinder is set so that the bark particles move along the spiral plate for no less than 2 hours to achieve carbonization of the bark particles. S3: The carbonized bark particles accumulate in the transfer chamber and enter the inner cylinder under the rotation of the screw conveyor. The rotation speed of the screw conveyor is controlled so that the carbonized bark particles are transported along the screw conveyor for 0.5h-2h, thus realizing the first activation of the bark particles. S4: Collect the first activated bark particles discharged from outlet two and cool them to room temperature. After washing and drying, spray them with hydrochloric acid for secondary activation. Finally, dry them again to obtain the finished modified activated carbon.

9. The green preparation method of modified activated carbon according to claim 8, characterized in that, The concentration of the hydrochloric acid is between 0.5 mol / L and 1.5 mol / L.

Images