Production device and production method of nano-microporous high-specific-surface-area activated carbon

Abstract

The invention relates to a production device and a production method of nano-microporous high-specific-surface-area activated carbon, and the device comprises an acid pickling cylinder, the cylinder wall of which is provided with an acid pickling cavity, and the acid pickling cavity is internally provided with an acid pickling spiral channel; a washing cavity is formed in the cylinder wall of the washing cylinder, and a washing spiral channel is formed in the washing cavity; the connecting pipeline is used for connecting the upper parts of the pickling spiral channel and the washing spiral channel, the connecting pipeline is inclined, and the higher end of the connecting pipeline is connected with the pickling cylinder; a feed pipe; a discharge pipe; the spiral stirring plate is spiral and is spirally wound in the pickling spiral channel; a first filter screen and a second filter screen are sequentially arranged on the lower end face of the connecting pipeline, a plurality of obliquely-arranged washing nozzles are arranged in the connecting pipeline, and the spraying direction of the washing nozzles is in the same direction as the medium flowing direction of the connecting pipeline. The pickling cylinder and the washing cylinder are connected through the obliquely-arranged connecting pipeline, pickling and washing of activated carbon can be continuously carried out, and the production efficiency of the activated carbon is improved.

Description

Technical Field

[0001] The present application relates to the technical field of activated carbon production, and in particular to a nano-microporous high specific surface area activated carbon production device and a production method thereof. Background Art

[0002] Nano-microporous high specific surface area activated carbon is a carbon material with a special physical structure. This activated carbon is characterized by its nano-scale microporous structure and extremely high specific surface area. Micropores refer to pores with a pore size of less than 2 nanometers, and high specific surface area refers to the large surface area per unit mass of activated carbon, usually above 1000 square meters / gram. Such a structure enables activated carbon to provide a large number of adsorption sites, thereby showing excellent adsorption capacity. It is mainly used in water purification, air purification, waste gas treatment, food and drug purification and other fields. It is generally prepared by physical activation, chemical activation or template synthesis, which can effectively create and maintain the microporous structure in activated carbon. Its production process generally includes screening, carbon activation, crushing and screening, pickling, washing, dehydration and drying. The pickling and washing processes are to remove heavy metal impurities in activated carbon, adjust the pH value, and reduce dust on the surface and in the pores of activated carbon.

[0003] In the related art, the patent document with application number CN202111643851.4 proposes a continuous washing system for microporous activated carbon crystals, including a frame, a belt conveyor mechanism is provided on the frame, and a feeding and spreading mechanism, a pickling mechanism, a water washing and draining mechanism and a drying mechanism are sequentially arranged along the conveying direction of the belt conveyor mechanism, the feeding and spreading mechanism is arranged above the starting section of the belt conveyor mechanism, the belt conveyor mechanism runs through the pickling mechanism and the water washing and draining mechanism, the drying mechanism is arranged above and below the terminal section of the belt conveyor mechanism, and a lower hopper is arranged below the discharging end of the belt conveyor mechanism. The invention facilitates continuous washing and drying, is simple to operate, reduces labor intensity, and improves washing efficiency.

[0004] The above-mentioned related technologies have the following defects: although when the activated carbon is pickled, the activated carbon is spread on the belt screen and the acid is sprayed in the form of acid mist through an atomizing nozzle, which can increase the contact area between the acid and the activated carbon to a certain extent, the activated carbon powder has a small density and is easily stratified when infiltrated with acid mist, making it difficult for the acid mist to fully and evenly pickle the activated carbon spread on the belt screen, resulting in uneven pickling quality, thereby affecting the quality and use effect of the activated carbon. Summary of the invention

[0005] In order to improve the problem of uneven acid washing quality of the spread activated carbon, the present application provides a nano-microporous high specific surface area activated carbon production device and a production method thereof.

[0006] The first aspect of the present application provides a nano-microporous high specific surface area activated carbon production device adopts the following technical solution: A nano-microporous high specific surface area activated carbon production device, comprising: A pickling cylinder, the cylinder wall of which has a pickling cavity, the pickling cylinder is provided with a first spiral partition in the pickling cavity, and the first spiral partition divides the pickling cavity into a pickling spiral channel; A water washing cylinder, the cylinder wall of which has a water washing cavity, the water washing cylinder is provided with a second spiral partition in the water washing cavity, the second spiral partition divides the water washing cavity into a water washing spiral channel; A connecting pipe is used to connect the pickling spiral channel and the upper part of the water washing spiral channel, the connecting pipe is inclined and its higher end is connected to the pickling cylinder; A feed pipe connected to the pickling cylinder and in communication with the lower portion of the pickling spiral channel; A discharge pipe connected to the water washing cylinder and communicated with the lower part of the water washing spiral channel; A spiral stirring plate, which is spirally shaped and spirally wound in the pickling spiral channel; The lower end surface of the connecting pipe is provided with a first filter screen and a second filter screen in sequence from the upper end to the lower end thereof, and the connecting pipe is connected with an acid solution recovery pipe corresponding to the first filter screen and a primary water washing liquid recovery pipe corresponding to the second filter screen respectively; The connecting pipe is provided with a plurality of water washing nozzles which are inclined to point to the junction of the second filter screen and the lower inner bottom wall of the connecting pipe. The spraying direction of the water washing nozzles is in the same direction as the medium flow direction of the connecting pipe. The water washing nozzles are connected to an external water source.

[0007] Furthermore, a plurality of strip-shaped nozzles tilted toward the second filter screen are arranged in the connecting pipe, and the spraying direction of the strip-shaped nozzles is in the same direction as the medium flow direction of the connecting pipe.

[0008] Furthermore, a plurality of the strip-shaped nozzles are provided, and a plurality of water curtains sprayed from the plurality of strip-shaped nozzles staggeredly cover the cross section of the second filter screen.

[0009] Furthermore, a flow-throwing plate is provided at the connection portion between the connecting pipe and the pickling cylinder, and an angle between the flow-throwing plate and the bottom wall of the upper end of the connecting pipe is an acute angle.

[0010] Furthermore, a plurality of air nozzles pointing to the first filter screen are arranged at the gap between the jet plate and the bottom wall of the upper end of the connecting pipe, and the air nozzles are connected to an external high-pressure air source.

[0011] Furthermore, a front-end pH meter and a rear-end pH meter are sequentially arranged in the water-washing cylinder along the medium flow direction of the water-washing spiral channel, and an alkali solution dripping device is arranged between the front-end pH meter and the rear-end pH meter in the water-washing spiral channel, and the alkali solution dripping device is electrically connected to a neutralization controller, and the neutralization controller is electrically connected to both the front-end pH meter and the rear-end pH meter; The neutralization controller is configured to: when the front-end pH meter detects that the solution in the water-washing spiral channel is acidic, control the alkali solution dripping device to drip a first dose of alkali solution; and when the rear-end pH meter detects that the solution in the water-washing spiral channel is acidic, control the alkali solution dripping device to drip a second dose of alkali solution, wherein the first dose is greater than the second dose.

[0012] Furthermore, a closing piece is fixedly connected to the inner wall of the water washing cylinder corresponding to the alkali solution dripping device, and the flow cross-sectional area of ​​the water washing spiral channel corresponding to the closing piece is smaller than the cross-sectional area of ​​the rest of the water washing spiral channel.

[0013] Furthermore, a first solenoid valve is provided in the water washing cylinder downstream of the rear end pH meter, a second solenoid valve is provided on the pipeline of the water washing nozzle, and both the first solenoid valve and the second solenoid valve are controllably connected to the neutralization controller; The neutralization controller is further configured to: when the rear-end pH meter detects that the solution in the water-washing spiral channel is acidic, control the first solenoid valve to cut off the water-washing spiral channel and control the second solenoid valve to close; and When the rear-end pH meter detects that the solution in the water-washing spiral channel is neutral, the first solenoid valve is controlled to open and the second solenoid valve is controlled to open with a delay.

[0014] Furthermore, a recoil nozzle connected to an external water source is provided in the water washing cylinder, the spraying direction of the recoil nozzle is opposite to the medium flow direction of the water washing spiral channel, the recoil nozzle is arranged downstream of the alkali solution dripping device, and a third solenoid valve is arranged on the pipeline of the recoil nozzle; The neutralization controller is further configured to control the third solenoid valve to open when it controls the second solenoid valve to close.

[0015] The second aspect of the present application provides a method for producing nano-microporous high specific surface area activated carbon using the following technical solution: A method for producing nanoporous high specific surface area activated carbon, based on the above-mentioned nanoporous high specific surface area activated carbon production device, comprises the following steps: S1. The high carbon raw material is crushed and sieved, and activated to obtain nano-microporous high specific surface area activated carbon; S2. Mixing the activated carbon in step S1 with the acid solution to obtain an activated carbon slurry, and pumping the activated carbon slurry into the pickling spiral channel through the feed pipe; S3. When the activated carbon slurry spirally rises in the pickling spiral channel, the spiral stirring flow of the spiral stirring plate causes the activated carbon and the acid in the activated carbon slurry to be fully mixed to complete the pickling; S4. The activated carbon slurry after acid washing flows into the connecting pipe and is filtered through the first filter screen and the second filter screen in sequence. The acid liquid filtered through the first filter screen is collected in the acid liquid recovery pipe, and the activated carbon residue slides onto the second filter screen along the inclination trend of the connecting pipe, and the activated carbon residue on the second filter screen is washed, so that the washing water carries the activated carbon residue and flows into the water washing cylinder through the lower part of the connecting pipe; S5. The rinse water carries the activated carbon residue and is fully mixed in the water washing spiral channel to complete the water washing; S6. Dehydrate and dry the activated carbon residue after washing to obtain finished activated carbon.

[0016] In summary, the beneficial technical effects of this application are: 1. During the pickling and water washing process of activated carbon, the activated carbon powder is mixed with acid solution to obtain activated carbon slurry, which is then pumped into the pickling spiral channel through the feed pump and feed pipe. With the pressurized pumping of the feed pump, the activated carbon slurry spirally rises from bottom to top in the pickling spiral channel of the pickling cylinder, and with the help of the setting of the spiral stirring plate, the activated carbon slurry is spirally circulated in the spiral channel, which not only increases the circulation stroke of the activated carbon slurry, but also greatly promotes the turbulent flow form of the activated carbon slurry when it circulates in the spiral channel, which can further improve the pickling effect of the activated carbon; 2. After the pickling is completed, the activated carbon slurry flows autonomously from the top of the pickling cylinder to the top of the water washing cylinder through the connecting pipe under the action of gravitational potential energy. In this process, when the activated carbon slurry flows to the first filter screen, the acid passes through the first filter screen and flows back to the acid recovery pool through the acid recovery pipe, while the activated carbon residue continues to slide along the inclined surface of the connecting pipe to the second filter screen under the impact of the subsequent activated carbon slurry; the activated carbon residue on the second filter screen can continue to be filtered to precipitate the residual acid liquid, and at the same time, multiple strip nozzles spray multiple water curtains, which can, on the one hand, perform preliminary water washing on the activated carbon residue on the second filter screen to reduce the residual acid content in the activated carbon residue, and the filtrate after washing is recovered through the primary water washing liquid recovery pipe; on the other hand, the inclined strip nozzle can flush the activated carbon residue on the second filter screen to the lower end of the connecting pipe in turn, so that the activated carbon residue after the initial water washing can flow smoothly to the junction of the second filter screen and the bottom wall of the lower end of the connecting pipe, and flow smoothly to the water washing cylinder under the flushing water sprayed by the water washing nozzle; 3. Through the setting of the jet plate, the activated carbon slurry output from the pickling spiral channel has a certain initial kinetic energy and is thrown on the first filter screen, which can not only improve the filtering efficiency of the activated carbon slurry on the first filter screen, but also give the activated carbon slurry kinetic energy in the inclined direction of the connecting pipe, so that the activated carbon residue after filtering can flow to the second filter screen as much as possible. In addition, since a plurality of air jets are also arranged in the gap below the jet plate, more kinetic energy can be further given to the activated carbon slurry and the activated carbon residue after filtering in the inclined direction of the connecting pipe, so as to ensure that the activated carbon residue on the first filter screen can flow smoothly to the second filter screen, and smoothly enter the water washing cylinder under the flushing of a plurality of strip nozzles and a plurality of water washing nozzles, so as to ensure the smooth connection between the pickling process and the water washing process; 4. With the help of the first solenoid valve, the recoil nozzle and other structures, when the solution in the water washing spiral channel is acidic, the alkali solution dripping device can automatically drip alkali solution into the stop area, and under the action of the clean water sprayed by the recoil nozzle, the solution in the stop interval can be pushed in the reverse direction, which can greatly promote the mixing efficiency of the dripped alkali solution and the solution; and after the solution in the stop interval overflows, it can overflow to the second filter screen and flow out to the primary water washing liquid recovery pipe, which will not interfere with the upstream pickling process. Therefore, in terms of ensuring the quality of water washing technology, it can ensure that the pickling process does not stop, and can effectively ensure the production efficiency of activated carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the overall structure of an embodiment of the present application; Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A; Figure 3 yes Figure 1 A partial enlarged schematic diagram of part B.

[0018] Description of reference numerals: 1. Pickling cylinder; 11. Pickling chamber; 12. First spiral partition; 13. Pickling spiral channel; 14. Feed pipe; 15. Spiral stirring plate; 2. Water washing cylinder; 21. Water washing chamber; 22. Second spiral partition; 23. Water washing spiral channel; 24. Discharging pipe; 25. Closing piece; 3. Connecting pipeline; 311. First filter screen; 312. Acid recovery pipe; 321. Second filter screen; 322. Primary water washing liquid recovery pipe; 33. Flow plate; 34. Air jet nozzle; 41. Water washing nozzle; 42. Strip nozzle; 43. Recoil nozzle; 51. Front-end pH meter; 52. Back-end pH meter; 53. Alkali solution dripping device; 61. First solenoid valve; 62. Second solenoid valve; 63. Third solenoid valve; 71. Feed pump; 72. Centrifuge; 73. Acid recovery tank; 74. Electrode net; 75. Acid recycling pipeline. DETAILED DESCRIPTION

[0019] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0020] The present application discloses a nanoporous high specific surface area activated carbon production device. Figure 1 and Figure 2 , which includes: The pickling cylinder 1 has a pickling cavity 11 on its wall. The pickling cavity 11 is provided with a first spiral partition 12. The first spiral partition 12 divides the pickling cavity 11 into a pickling spiral channel 13. The water washing cylinder 2 has a water washing chamber 21 on its wall. The water washing cylinder 2 is provided with a second spiral partition 22 in the water washing chamber 21. The second spiral partition 22 divides the water washing chamber 21 into a water washing spiral channel 23. The water washing cylinder 2 is arranged on the inner side of the pickling cylinder 1, which can greatly save the space occupied by the device.

[0021] The connecting pipe 3 is used to connect the upper part of the pickling spiral channel 13 and the water washing spiral channel 23. The connecting pipe 3 is inclined and its higher end is connected to the pickling cylinder 1 and its lower end is connected to the water washing cylinder 2. A feed pipe 14 is connected to the pickling cylinder 1 and communicated with the lower part of the pickling spiral channel 13. A feed pump 71 is provided on the feed pipe 14 to pump the mixed slurry of activated carbon and acid solution into the pickling spiral channel 13; The discharge pipe 24 is connected to the water washing cylinder 2 and communicated with the lower part of the water washing spiral channel 23. The discharge pipe 24 is connected to a centrifuge 72 for dehydrating the activated carbon slurry after water washing to obtain activated carbon wet material; The spiral stirring plate 15 is spirally shaped and spirally wound in the pickling spiral channel 13. The spiral stirring plate 15 is made of corrosion-resistant material, which can make the activated carbon slurry flow in the pickling spiral channel 13 in a spiral-like state; and there is a gap between the outer peripheral side of the spiral stirring plate 15 and the inner wall of the pickling spiral channel 13 to reduce the flow resistance of the mixed slurry.

[0022] Reference Figure 1 and Figure 2The lower end surface of the connecting pipe 3 is provided with a first filter screen 311 and a second filter screen 321 in sequence from its upper end to the lower end, and the connecting pipe 3 is connected with an acid liquid recovery pipe 312 corresponding to the first filter screen 311 and a primary water washing liquid recovery pipe 322 corresponding to the second filter screen 321 respectively; specifically, the lower end surface of the connecting pipe 3 is penetrated with a first perforation and a second perforation in sequence from top to bottom, and the first filter screen 311 and the second filter screen 321 are respectively embedded in the first perforation and the second perforation.

[0023] A plurality of water washing nozzles 41 are arranged in the connecting pipe 3, which are inclined to the junction of the second filter screen 321 and the inner bottom wall at the lower end of the connecting pipe 3. The spraying direction of the water washing nozzle 41 is in the same direction as the medium flow direction of the connecting pipe 3. The water washing nozzle 41 is connected to an external water source, and can flush the activated carbon residue after acid washing and filtration, so that it mixes with the flushing water and enters the water washing cylinder 2.

[0024] A plurality of strip nozzles 42 are arranged in the connecting pipe 3, which are inclined to the second filter screen 321. The spraying direction of the strip nozzles 42 is in the direction of the medium flow direction of the connecting pipe 3. There are a plurality of strip nozzles 42, and the plurality of water curtains sprayed by the plurality of strip nozzles 42 cover the cross section of the second filter screen 321 in an interlaced manner. The water curtains sprayed by the strip nozzles 42 are arranged to intersect with the inclined direction of the connecting pipe 3. For example, the water curtains sprayed by two adjacent strip nozzles 42 are arranged at intervals in the length direction of the connecting pipe 3, and the sum of the sizes in the width direction of the connecting pipe 3 is greater than the width of the connecting pipe 3 and less than twice the width of the connecting pipe 3. In this way, the water curtains sprayed by the plurality of strip nozzles 42 can not only fully flush the activated carbon residue on the second filter screen 321, but also form an intermittent flushing effect on the activated carbon residue on the second filter screen 321, thereby avoiding blocking the downward flow trend of the activated carbon residue on the second filter screen 321 and promoting the activated carbon residue on the second filter screen 321 to flow downward along the inclined surface of the connecting pipe 3.

[0025] Therefore, when it is necessary to carry out pickling and water washing of the activated carbon after activation, the activated carbon powder and the acid solution can be mixed to obtain the activated carbon slurry, and then pumped into the pickling spiral channel 13 through the feed pump 71 and the feed pipe 14. With the pressurized pumping of the feed pump 71, the activated carbon slurry spirally rises from bottom to top in the pickling spiral channel 13 of the pickling cylinder 1, which greatly increases the circulation formation of the activated carbon slurry in the pickling cylinder 1, and can effectively improve the pickling effect of the activated carbon; and, since the pickling spiral channel 13 is also provided with a spiral stirring plate 15 adapted to the spiral winding, the activated carbon slurry is also in a spiral-like circulation form when circulating in the spiral channel, which further increases the circulation distance of the activated carbon slurry, and greatly promotes the turbulent form of the activated carbon slurry when circulating in the spiral channel, so that the activated carbon powder and the acid solution in the activated carbon slurry are mixed more violently and fully, thereby further improving the pickling effect of the activated carbon.

[0026] After the pickling is completed, the activated carbon slurry flows autonomously from the top of the pickling cylinder 1 to the top of the water washing cylinder 2 through the connecting pipe under the action of gravity potential energy. In this process, when the activated carbon slurry flows to the first filter screen 311, the acid passes through the first filter screen 311 and flows back to the acid recovery tank 73 through the acid recovery pipe 312, while the activated carbon residue continues to slide along the inclined surface of the connecting pipe 3 to the second filter screen 321 under the impact of the subsequent activated carbon slurry; the activated carbon residue on the second filter screen 321 can continue to filter and precipitate the residual acid, and at the same time, the plurality of strip nozzles 4 2 sprays out multiple water curtains, which can, on the one hand, perform preliminary water washing on the activated carbon residue on the second filter screen 321 to reduce the residual acid content in the activated carbon residue, and the filtrate after washing is recovered through the primary water washing liquid recovery pipe 322; on the other hand, the inclined strip nozzle 42 can wash the activated carbon residue on the second filter screen 321 to the lower end of the connecting pipe 3 in sequence, so that the activated carbon residue after the initial water washing can smoothly flow to the junction of the second filter screen 321 and the bottom wall of the lower end of the connecting pipe 3, and smoothly flow into the water washing cylinder 2 under the washing of the washing water sprayed by the water washing nozzle 41.

[0027] The activated carbon residue and flushing water entering the washing cylinder 2 are further circulated in the washing spiral channel 23. The setting of the washing spiral channel 23 can also greatly increase the circulation of the activated carbon residue and the flushing water in a limited space, so that the flushing water has a better washing effect on the activated carbon residue. After the washing is completed, the activated carbon residue enters the centrifuge 72 together with the flushing water for centrifugal dehydration. After the dehydration is completed, the obtained activated carbon wet material is dried to obtain the finished activated carbon.

[0028] Therefore, the activated carbon production device of the present application can be used to continuously carry out acid washing and water washing on the activated carbon, and can also effectively ensure the acid washing and water washing effects, thereby greatly improving the production efficiency of the activated carbon. The overall device occupies a small space and has low operating costs; and the acid liquid after acid washing is recovered to the acid liquid recovery tank 73, and after pH adjustment and corresponding treatment, it can continue to reflux for acid washing, which can realize the effective recovery and reuse of acid liquid resources to save resources and reduce pollution to the environment.

[0029] Further, in order to facilitate the activated carbon residue on the first filter screen 311 to flow smoothly to the second filter screen 321, refer to Figure 1 and Figure 2 A jet plate 33 is provided at the connection portion between the connecting pipe 3 and the pickling cylinder 1, and the angle between the jet plate 33 and the upper bottom wall of the connecting pipe 3 is an acute angle. In addition, a plurality of air jets 34 pointing to the first filter screen 311 are provided at the gap between the jet plate 33 and the upper bottom wall of the connecting pipe 3, and the air jets 34 are connected to an external high-pressure gas source.

[0030] Therefore, by setting the jet plate 33, the activated carbon slurry outputted from the pickling spiral channel 13 has a certain initial kinetic energy and is thrown on the first filter screen 311, which can not only improve the filtering efficiency of the activated carbon slurry on the first filter screen 311, but also give the activated carbon slurry kinetic energy in the inclined direction of the connecting pipe 3, so that the filtered activated carbon residue flows as much as possible onto the second filter screen 321. In addition, since a plurality of air jets 34 are also provided in the gap below the jet plate 33, more kinetic energy can be further given to the activated carbon slurry and the filtered activated carbon residue in the inclined direction of the connecting pipe 3, so as to ensure that the activated carbon residue on the first filter screen 311 can flow smoothly to the second filter screen 321, and smoothly enter the water washing cylinder 2 under the flushing of the plurality of strip nozzles 42 and the plurality of water washing nozzles 41, so as to ensure the smooth connection between the pickling process and the water washing process.

[0031] In addition, considering that the activated carbon residue still has a certain degree of weak acidity during the washing process, in order to reduce the impact on the quality of the finished activated carbon, refer to Figure 1 and Figure 3 In the washing cylinder 2, a front end pH meter 51 and a rear end pH meter 52 are sequentially arranged along the medium flow direction of the washing spiral channel 23. An alkali solution dripping device 53 is arranged between the front end pH meter 51 and the rear end pH meter 52 in the washing spiral channel 23. The alkali solution dripping device 53 is conventional technology and will not be described in detail here. The alkali solution dripping device 53 is electrically connected to a neutralization controller, and the neutralization controller is electrically connected to both the front end pH meter 51 and the rear end pH meter 52.

[0032] The neutralization controller is configured as follows: when the front-end pH meter 51 detects that the solution in the water-washing spiral channel 23 is acidic, the alkali solution dripping device 53 is controlled to drip a first dose of alkali solution; and when the rear-end pH meter 52 detects that the solution in the water-washing spiral channel 23 is acidic, the alkali solution dripping device 53 is controlled to drip a second dose of alkali solution, the first dose is greater than the second dose, wherein the addition of the first dose of alkali solution and the second dose of alkali solution can be triggered synchronously, that is, when both the front-end pH meter 51 and the rear-end pH meter 52 detect that the solution is acidic, the amount of alkali solution dripped by the alkali solution dripping device 53 is the sum of the first dose and the second dose. In addition, the setting of the first dose is determined after the equipment is tested and run to ensure that under continuous stable working conditions, a single addition of the first dose of alkali solution will not make the solution in the water-washing spiral channel 23 alkaline, and it can be a fixed value or a dynamic value. If it is a dynamic value, the value is determined by the flow rate of the solution in the water-washing spiral channel 23. For example, a flow meter is added upstream of the front-end pH meter 51, and a suitable first dose is selected according to the flow data of the flow meter. The selection control process is a conventional technology and will not be repeated here.

[0033] Moreover, a closing piece 25 is fixedly connected to the inner wall of the water washing cylinder 2 corresponding to the alkali solution dripping device 53. The flow cross-sectional area of ​​the water washing spiral channel 23 corresponding to the closing piece 25 is smaller than the cross-sectional area of ​​the remaining parts of the water washing spiral channel 23. The closing piece 25 can be one or more closing plates fixedly connected to the inner wall of the water washing cylinder 2, or it can be a complete closing cone cylinder to reduce the flow channel diameter when the solution in the water washing spiral channel 23 flows to this place.

[0034] At the same time, refer to Figure 1 and Figure 3 A first solenoid valve 61 is provided in the water washing cylinder 2 downstream of the rear end pH meter 52. The first solenoid valve 61 can be used to open and stop the water washing spiral channel 23. A second solenoid valve 62 is provided on the pipeline of the water washing nozzle 41. The first solenoid valve 61 and the second solenoid valve 62 are both connected to the neutralization controller for control; The neutralization controller is further configured to: when the rear end pH meter 52 detects that the solution in the water washing spiral channel 23 is acidic, control the first solenoid valve 61 to cut off the water washing spiral channel 23 and control the second solenoid valve 62 to close; and When the rear end pH meter 52 detects that the solution in the water washing spiral channel 23 is neutral, the first solenoid valve 61 is controlled to open and the second solenoid valve 62 is controlled to open with a delay.

[0035] Thus, during the process of washing the activated carbon residue with the washing water sprayed by the washing nozzle 41 and circulating in the washing spiral channel 23 for washing, the front-end pH meter 51 detects the pH value of the solution in the washing spiral channel 23, and controls the alkali solution dripping device 53 to drip the first dose of alkali solution into the washing spiral channel 23 with the help of the neutralization controller, so as to neutralize the solution in the washing spiral channel 23 to reduce the impact on the quality of the activated carbon residue. The rear-end pH meter 52 arranged downstream rechecks the pH value of the solution after the alkali solution is dripped. If the solution is still acidic, it means that the amount of alkali solution dripped by the alkali solution dripping device 53 is small, and the second dose of alkali solution can be supplemented or superimposed to drip alkali solution to make the solution in the rear section of the washing spiral channel 23 as neutral as possible.

[0036] Among them, once the rear-end pH meter 52 re-checks and shows that the solution is acidic, the neutralization controller also controls the first solenoid valve 61 to close. At this time, the acidic solution can no longer continue to circulate, and accumulates in the water washing spiral channel 23 in the interval from the first solenoid valve 61 to its top position, which is regarded as the stop interval. At this time, the alkali solution dripping device 53 is controlled to drip alkali solution into the water washing spiral channel 23, and the solution in this part of the stop interval can be neutralized and adjusted; after the adjustment is completed, the rear-end pH meter 52 re-checks and shows that the solution is neutral or close to neutral, and the first solenoid valve 61 is controlled to open again, so that this part of the solution continues to circulate in the water washing spiral channel 23, which can effectively ensure that the solution output in the rear section of the water washing spiral channel 23 is as neutral as possible.

[0037] Further, in order to improve the efficiency of the solution in the interception interval of the washed spiral channel 23 during the neutralization adjustment, refer to Figure 1 and Figure 3 A recoil nozzle 43 connected to an external water source is also provided in the water washing cylinder 2. The spray direction of the recoil nozzle 43 is opposite to the medium flow direction of the water washing spiral channel 23. The recoil nozzle 43 is provided downstream of the alkali solution dripping device 53. A third solenoid valve 63 is provided on the pipeline of the recoil nozzle 43; The neutralization controller is further configured to control the third solenoid valve 63 to open when it controls the second solenoid valve 62 to close.

[0038] Therefore, when the first solenoid valve 61 is closed to stop the solution in the water-washing spiral channel 23, the second solenoid valve 62 is also closed to stop the water-washing nozzle 41 from continuing to replenish flushing water into the stop interval. At this time, the third solenoid valve 63 is opened, and the backwash nozzle 43 sprays clean water into the water-washing spiral channel 23, so that it is flushed along the medium flow direction opposite to the water-washing spiral channel 23, and the solution in the stop interval can be pushed in the reverse direction, which can greatly promote the mixing efficiency of the added alkali solution and the solution; and after the solution in the stop interval overflows, it can overflow to the second filter screen 321 and flow out to the primary water-washing liquid recovery pipe 322, which will not interfere with the upstream pickling process. Therefore, in terms of the technology of ensuring the water washing quality, the pickling process can be guaranteed not to stop, and the production efficiency of the activated carbon can be effectively guaranteed.

[0039] In addition, in order to further improve the recovery effect of acid solution and ensure the pickling effect, refer to Figure 1 In another feasible embodiment, an electrode net 74 can be arranged in the acid recovery pool 73, and the electrode net 74 divides the acid recovery pool 73 into two parts, namely, left and right parts. Heavy metal ions in the acid after pickling can be removed by electrifying the electrode net 74. The discharge port of the acid recovery pipe 312 and the liquid inlet port of the acid recycling pipeline 75 are located on both sides of the electrode net 74. By connecting the acid recycling pipeline 75 with the feed pipe 14, the recycling of the acid can be achieved. If necessary, a pH meter and an acid dripping device can be arranged in the acid recycling pipeline 75 to adjust the pH value of the recycled acid to ensure that the production requirements are met.

[0040] The present application embodiment discloses a method for producing nano-microporous high specific surface area activated carbon, based on the above-mentioned nano-microporous high specific surface area activated carbon production device, referring to Figure 1 and Figure 2 , which comprises the following steps: S1. The high-carbon raw material is crushed and sieved, and activated to obtain nano-porous high specific surface area activated carbon. The specific activation method is conventional technology and will not be repeated here; S2. Mixing the activated carbon in step S1 with the acid solution to obtain an activated carbon slurry, and pumping the activated carbon slurry into the pickling spiral channel 13 through the feed pipe 14; S3. When the activated carbon slurry spirally rises in the pickling spiral channel 13, the spiral stirring flow of the spiral stirring plate 15 causes the activated carbon and the acid in the activated carbon slurry to be fully mixed to complete the pickling; S4. The activated carbon slurry after acid washing flows into the connecting pipe 3 and is filtered through the first filter screen 311 and the second filter screen 321 in sequence. The acid liquid filtered through the first filter screen 311 is collected in the acid liquid recovery pipe 312, and the activated carbon residue slides onto the second filter screen 321 along the inclination trend of the connecting pipe 3. The activated carbon residue on the second filter screen 321 is washed, so that the washing water carries the activated carbon residue and flows into the water washing cylinder 2 through the lower part of the connecting pipe 3; S5. The rinse water carries the activated carbon residue in the washing spiral channel 23 and is fully mixed to complete the washing; S6. Dehydrate and dry the activated carbon residue after washing to obtain finished activated carbon.

[0041] Among them, in step S5, during water washing, the pH value of the solution in the water washing spiral channel 23 is also monitored in real time, and the solution is neutralized and adjusted by the alkali solution adding device so that the solution finally output from the water washing spiral channel 23 is neutral or nearly neutral.

[0042] The implementation principle of the nano-microporous high specific surface area activated carbon production device in the present application embodiment is: During the pickling and water washing process of the activated carbon, the activated carbon powder is mixed with the acid solution to obtain the activated carbon slurry, which is then pumped into the pickling spiral channel 13 through the feed pump 71 and the feed pipe 14. With the pressurized pumping of the feed pump 71, the activated carbon slurry spirally rises from bottom to top in the pickling spiral channel 13 of the pickling barrel 1, and with the help of the setting of the spiral stirring plate 15, the activated carbon slurry is in a spiral-like circulation form when it spirally circulates in the spiral channel, which not only increases the circulation distance of the activated carbon slurry, but also greatly promotes the turbulent flow form of the activated carbon slurry when it circulates in the spiral channel, which can further improve the pickling effect of the activated carbon.

[0043] After the pickling is completed, the activated carbon slurry flows autonomously from the top of the pickling cylinder 1 to the top of the water washing cylinder 2 through the connecting pipe under the action of gravity potential energy. In this process, when the activated carbon slurry flows to the first filter screen 311, the acid passes through the first filter screen 311 and flows back to the acid recovery tank 73 through the acid recovery pipe 312, while the activated carbon residue continues to slide along the inclined surface of the connecting pipe 3 to the second filter screen 321 under the impact of the subsequent activated carbon slurry; the activated carbon residue on the second filter screen 321 can continue to filter and precipitate the residual acid, and at the same time, the plurality of strip nozzles 4 2 sprays out multiple water curtains, which can, on the one hand, perform preliminary water washing on the activated carbon residue on the second filter screen 321 to reduce the residual acid content in the activated carbon residue, and the filtrate after washing is recovered through the primary water washing liquid recovery pipe 322; on the other hand, the inclined strip nozzle 42 can wash the activated carbon residue on the second filter screen 321 to the lower end of the connecting pipe 3 in sequence, so that the activated carbon residue after the initial water washing can smoothly flow to the junction of the second filter screen 321 and the bottom wall of the lower end of the connecting pipe 3, and smoothly flow into the water washing cylinder 2 under the washing of the washing water sprayed by the water washing nozzle 41.

[0044] The activated carbon residue and flushing water entering the washing cylinder 2 are further circulated in the washing spiral channel 23. The setting of the washing spiral channel 23 can also greatly increase the circulation of the activated carbon residue and the flushing water in a limited space, so that the flushing water has a better washing effect on the activated carbon residue. After the washing is completed, the activated carbon residue enters the centrifuge 72 together with the flushing water for centrifugal dehydration. After the dehydration is completed, the obtained activated carbon wet material is dried to obtain the finished activated carbon.

[0045] And with the help of the first solenoid valve 61, the recoil nozzle 43 and other structures, when the solution in the water washing spiral channel 23 is acidic, the alkali solution dripping device 53 can automatically drip alkali solution into the stop area, and under the action of the clean water sprayed by the recoil nozzle 43, the solution in the stop interval can be pushed in the reverse direction, which can greatly promote the mixing efficiency of the dripped alkali solution and the solution; and after the solution in the stop interval overflows, it can overflow to the second filter 321 and flow out to the primary water washing liquid recovery pipe 322, which will not interfere with the upstream pickling process. Therefore, in terms of ensuring the quality of water washing technology, it is possible to ensure that the pickling process does not stop, and the production efficiency of activated carbon can be effectively guaranteed.

[0046] Therefore, the activated carbon production device of the present application can continuously carry out acid washing and water washing on the activated carbon, and can also effectively ensure the acid washing and water washing effects, greatly improving the production efficiency of the activated carbon, and the acid liquid after acid washing is recovered to the acid liquid recovery tank 73, and after pH adjustment and corresponding treatment, it can continue to reflux for acid washing, which can realize the effective recovery and reuse of acid liquid resources to save resources and reduce pollution to the environment.

[0047] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nano-microporous high specific surface area activated carbon production device, characterized in that: include: A pickling cylinder (1), the cylinder wall of which has a pickling cavity (11), the pickling cylinder (1) being provided with a first spiral partition (12) in the pickling cavity (11), the first spiral partition (12) dividing the pickling cavity (11) into a pickling spiral channel (13); A water washing cylinder (2), the cylinder wall of which has a water washing chamber (21), the water washing cylinder (2) being provided with a second spiral partition (22) in the water washing chamber (21), the second spiral partition (22) dividing the water washing chamber (21) into a water washing spiral channel (23); A connecting pipe (3) is used to connect the upper part of the pickling spiral channel (13) and the water washing spiral channel (23), the connecting pipe (3) being inclined and its higher end being connected to the pickling cylinder (1); A feed pipe (14) connected to the pickling cylinder (1) and in communication with the lower portion of the pickling spiral channel (13); A discharge pipe (24) connected to the water washing cylinder (2) and in communication with the lower portion of the water washing spiral channel (23); A spiral stirring plate (15) which is spirally shaped and spirally wound in the pickling spiral channel (13); The lower end surface of the connecting pipe (3) is provided with a first filter screen (311) and a second filter screen (321) in sequence from the upper end to the lower end thereof, and the connecting pipe (3) is connected to an acid liquid recovery pipe (312) corresponding to the first filter screen (311) and a primary water washing liquid recovery pipe (322) corresponding to the second filter screen (321), respectively; A plurality of water washing nozzles (41) are arranged in the connecting pipe (3) and are inclined to point toward the junction of the second filter screen (321) and the lower inner bottom wall of the connecting pipe (3). The spraying direction of the water washing nozzles (41) is in the same direction as the flow direction of the medium in the connecting pipe (3). The water washing nozzles (41) are connected to an external water source.

2. The nanoporous high specific surface area activated carbon production device according to claim 1, characterized in that: A plurality of strip-shaped nozzles (42) obliquely pointing toward the second filter screen (321) are arranged in the connecting pipe (3); the spraying direction of the strip-shaped nozzles (42) is in the same direction as the medium flow direction of the connecting pipe (3).

3. The nanoporous high specific surface area activated carbon production device according to claim 2, characterized in that: A plurality of the strip-shaped nozzles (42) are provided, and a plurality of water curtains sprayed from the plurality of strip-shaped nozzles (42) staggeredly cover the cross section of the second filter screen (321).

4. The nanoporous high specific surface area activated carbon production device according to claim 1, characterized in that: A flow-throwing plate (33) is provided at the connection portion between the connecting pipe (3) and the pickling cylinder (1); the included angle between the flow-throwing plate (33) and the bottom wall of the upper end of the connecting pipe (3) is an acute angle.

5. The nano-microporous high specific surface area activated carbon production device according to claim 4, characterized in that: A plurality of air nozzles (34) pointing toward the first filter screen (311) are provided at the gap between the jet plate (33) and the bottom wall of the upper end of the connecting pipe (3); the air nozzles (34) are connected to an external high-pressure air source.

6. A nano-microporous high specific surface area activated carbon production device according to any one of claims 1 to 5, characterized in that: A front pH meter (51) and a rear pH meter (52) are sequentially arranged in the water washing cylinder (2) along the medium flow direction of the water washing spiral channel (23); an alkali solution dripping device (53) is arranged between the front pH meter (51) and the rear pH meter (52) in the water washing spiral channel (23); the alkali solution dripping device (53) is electrically connected to a neutralization controller; and the neutralization controller is electrically connected to both the front pH meter (51) and the rear pH meter (52); The neutralization controller is configured to: when the front-end pH meter (51) detects that the solution in the water-washing spiral channel (23) is acidic, control the alkali solution dripping device (53) to drip a first dose of alkali solution; and when the rear-end pH meter (52) detects that the solution in the water-washing spiral channel (23) is acidic, control the alkali solution dripping device (53) to drip a second dose of alkali solution, wherein the first dose is greater than the second dose.

7. The nano-microporous high specific surface area activated carbon production device according to claim 6, characterized in that: The water washing cylinder (2) is fixedly connected with a closing piece (25) on the inner wall corresponding to the alkali solution dripping device (53); the flow cross-sectional area of ​​the water washing spiral channel (23) corresponding to the closing piece (25) is smaller than the cross-sectional area of ​​the rest of the water washing spiral channel (23).

8. The nano-microporous high specific surface area activated carbon production device according to claim 6, characterized in that: A first solenoid valve (61) is provided in the water washing cylinder (2) downstream of the rear end pH meter (52), and a second solenoid valve (62) is provided on the pipeline of the water washing nozzle (41), and both the first solenoid valve (61) and the second solenoid valve (62) are controllably connected to the neutralization controller; The neutralization controller is further configured to: when the rear end pH meter (52) detects that the solution in the water washing spiral channel (23) is acidic, control the first solenoid valve (61) to cut off the water washing spiral channel (23) and control the second solenoid valve (62) to close; and When the rear end pH meter (52) detects that the solution in the water washing spiral channel (23) is neutral, the first solenoid valve (61) is controlled to open, and the second solenoid valve (62) is controlled to open with a delay.

9. The nano-microporous high specific surface area activated carbon production device according to claim 8, characterized in that: The water washing cylinder (2) is provided with a recoil nozzle (43) connected to an external water source, the spraying direction of the recoil nozzle (43) is opposite to the medium flow direction of the water washing spiral channel (23), the recoil nozzle (43) is arranged downstream of the alkali solution dripping device (53), and a third solenoid valve (63) is arranged on the pipeline of the recoil nozzle (43); The neutralization controller is further configured to control the third solenoid valve (63) to open when it controls the second solenoid valve (62) to close.

10. A method for producing nanoporous high specific surface area activated carbon, based on a nanoporous high specific surface area activated carbon production device as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The high carbon raw material is crushed and sieved, and activated to obtain nano-microporous high specific surface area activated carbon; S2. Mixing the activated carbon in step S1 with the acid solution to obtain activated carbon slurry, and pumping the activated carbon slurry into the acid washing spiral channel (13) through the feed pipe (14); S3. When the activated carbon slurry spirally rises in the pickling spiral channel (13), the spiral stirring flow of the spiral stirring plate (15) causes the activated carbon and the acid in the activated carbon slurry to be fully mixed to complete the pickling; S4. The activated carbon slurry after acid washing flows into the connecting pipe (3) and is filtered through the first filter screen (311) and the second filter screen (321) in sequence. The acid liquid filtered through the first filter screen (311) is collected in the acid liquid recovery pipe (312), and the activated carbon residue slides onto the second filter screen (321) along the inclination of the connecting pipe (3). The activated carbon residue on the second filter screen (321) is washed, so that the washing water carries the activated carbon residue and flows through the lower part of the connecting pipe (3) to the water washing cylinder (2); S5. The activated carbon residue carried by the washing water is fully mixed in the washing spiral channel (23) to complete the washing; S6. Dehydrate and dry the activated carbon residue after washing to obtain finished activated carbon.

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