A production device and production method for nano-microporous activated carbon with high specific surface area

Abstract

The present application relates to a production device and a production method for nano-microporous activated carbon with a high specific surface area. The device includes: a pickling cylinder whose cylinder wall has a pickling chamber with a pickling spiral channel therein; a water-washing cylinder whose cylinder wall has a water-washing chamber with a water-washing spiral channel therein; a connecting pipeline for connecting the upper parts of the pickling spiral channel and the water-washing spiral channel, the connecting pipeline being inclined and its higher end being connected to the pickling cylinder; a feed pipe; a discharge pipe; a spiral stirring plate which is spiral-shaped and spirally wound in the pickling spiral channel; a first filter screen and a second filter screen are successively arranged on the lower end surface of the connecting pipeline, and a number of inclined water-washing spray heads are arranged in the connecting pipeline, and the spraying direction of the water-washing spray heads is in the same direction as the medium flow direction of the connecting pipeline. The present application connects the pickling cylinder and the water-washing cylinder through the inclined connecting pipeline, and can continuously carry out pickling and water-washing of activated carbon, improving the production efficiency of activated carbon.

Description

Technical Field

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

[0002] Nano-microporous high specific surface area activated carbon is a carbon material with a special physical structure. The characteristics of this activated carbon are that it has nano-scale microporous structures and an extremely high specific surface area. Among them, micropores refer to pores with a pore diameter less than 2 nanometers, and high specific surface area means that the activated carbon per unit mass has a large surface area, usually above 1000 square meters / gram. Such a structure enables the activated carbon to provide a large number of adsorption sites, thus showing excellent adsorption capacity, and is mainly applied in the fields of water purification treatment, air purification, waste gas treatment, food and drug purification, etc. It is generally prepared by methods such as physical activation, chemical activation or template synthesis. These methods can effectively create and maintain the microporous structure in the activated carbon. Its production process generally includes screening, carbon activation, crushing and screening, pickling, water washing, dehydration and drying. Among them, the pickling and water washing processes are to remove heavy metal impurities in the activated carbon, adjust the acidity and alkalinity, that is, the pH value, and reduce the dust on the surface layer and in the pores of the activated carbon.

[0003] In the related technology, the patent document with the application number CN202111643851.4 proposed a continuous washing system for microporous activated carbon crystals, including a frame. A belt conveying mechanism is arranged on the frame. Along the conveying direction of the belt conveying mechanism, a feeding and spreading mechanism, a pickling mechanism, a water washing and draining mechanism and a drying mechanism are arranged in sequence. The feeding and spreading mechanism is arranged above the starting section of the belt conveying mechanism. The belt conveying mechanism penetrates through the pickling mechanism and the water washing and draining mechanism. The drying mechanism is arranged above and below the termination section of the belt conveying mechanism. A blanking hopper is arranged below the discharging end of the belt conveying mechanism. This invention is convenient for continuous washing and drying, has simple operation, reduces the labor intensity, and improves the washing efficiency.

[0004] The above-mentioned related technology has the following defects: Although when pickling the activated carbon, the activated carbon is spread on a belt screen, and the acid solution is sprayed in the form of acid mist through an atomizing nozzle, which can increase the contact area between the acid solution and the activated carbon to a certain extent. However, due to the low density of the activated carbon powder and the easy occurrence of stratification when infiltrating with the acid mist, it is difficult for the acid mist to completely and evenly pickle the activated carbon spread on the belt screen, resulting in uneven pickling quality, thus 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:

[0007] A nano-microporous high specific surface area activated carbon production device, comprising:

[0008] 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;

[0009] 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;

[0010] 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;

[0011] A feed pipe connected to the pickling cylinder and in communication with the lower portion of the pickling spiral channel;

[0012] A discharge pipe connected to the water washing cylinder and communicated with the lower part of the water washing spiral channel;

[0013] A spiral stirring plate, which is spirally shaped and spirally wound in the pickling spiral channel;

[0014] 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;

[0015] 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.

[0016] 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.

[0017] 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.

[0018] Further, a throw flow plate is provided at the connection part of the connection pipeline and the pickling cylinder, and the included angle between the throw flow plate and the bottom wall at the upper end of the connection pipeline is an acute angle.

[0019] Further, a plurality of air jet nozzles pointing to the first filter screen are arranged at the gap between the throw flow plate and the bottom wall at the upper end of the connection pipeline, and the air jet nozzles are communicated with an external high-pressure air source.

[0020] Further, 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. An alkali liquid dropping device is arranged between the front-end pH meter and the rear-end pH meter in the water washing spiral channel. The alkali liquid dropping device is electrically connected with a neutralization controller, and the neutralization controller is electrically connected with both the front-end pH meter and the rear-end pH meter;

[0021] 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 liquid dropping device to drop a first dose of alkali liquid; and when the rear-end pH meter detects that the solution in the water washing spiral channel is acidic, control the alkali liquid dropping device to drop a second dose of alkali liquid, and the first dose is greater than the second dose.

[0022] Further, a closing piece is fixedly connected to the inner wall of the water washing cylinder corresponding to the alkali liquid dropping device, and the 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.

[0023] Further, a first solenoid valve is arranged downstream of the rear-end pH meter in the water washing cylinder, and a second solenoid valve is arranged on the pipeline of the water washing nozzle. Both the first solenoid valve and the second solenoid valve are controlled and connected with the neutralization controller;

[0024] 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

[0025] When the rear-end pH meter detects that the solution in the water washing spiral channel is neutral, control the first solenoid valve to open and control the second solenoid valve to open with a delay.

[0026] Further, a backflush nozzle communicated with an external water source is arranged in the water washing cylinder. The jet direction of the backflush nozzle is opposite to the medium flow direction of the water washing spiral channel. The backflush nozzle is arranged downstream of the alkali liquid dropping device, and a third solenoid valve is arranged on the pipeline of the backflush nozzle;

[0027] The neutralization controller is further configured to: when controlling the second solenoid valve to close, control the third solenoid valve to open.

[0028] A production method of nano-microporous high specific surface area activated carbon provided by the second aspect of the present application adopts the following technical solutions:

[0029] A production method of nano-microporous high specific surface area activated carbon, based on the above-mentioned production device of nano-microporous high specific surface area activated carbon, includes the following steps:

[0030] S1. Crush and screen the high-carbon raw material, and activate it to obtain nano-microporous high specific surface area activated carbon;

[0031] S2. Mix the activated carbon in step S1 with the acid solution to obtain an activated carbon slurry, and pump the activated carbon slurry through the feed pipe to the pickling spiral channel;

[0032] S3. When the activated carbon slurry spirally ascends in the pickling spiral channel, the spiral stirring flow of the spiral stirring plate makes the activated carbon and the acid solution in the activated carbon slurry fully mixed to complete pickling;

[0033] S4. The pickled activated carbon slurry flows into the connecting pipe and is filtered successively through the first filter screen and the second filter screen. The acid solution filtered by the first filter screen converges into the acid solution recovery pipe, and the activated carbon residue slides along the inclined trend of the connecting pipe onto the second filter screen. The activated carbon residue on the second filter screen is rinsed, so that the rinsing water carries the activated carbon residue and flows through the lower part of the connecting pipe into the water washing cylinder;

[0034] S5. The rinsing water carries the activated carbon residue and is fully mixed in the water washing spiral channel to complete water washing;

[0035] S6. Dehydrate and dry the water-washed activated carbon residue to obtain the finished activated carbon.

[0036] In summary, the beneficial technical effects of the present application are:

[0037] 1. During the pickling and water washing processes of activated carbon, the activated carbon powder is mixed with the acid solution to obtain an activated carbon slurry, and then pumped through the feed pipe to the pickling spiral channel by a feeding pump. With the pressurized pumping of the feeding pump, the activated carbon slurry spirally ascends from bottom to top in the pickling spiral channel of the pickling cylinder. With the aid of the setting of the spiral stirring plate, when the activated carbon slurry spirally flows in the spiral channel, it also shows a spiral-like flow form, which not only increases the flow stroke of the activated carbon slurry, but also greatly promotes the turbulent flow state of the activated carbon slurry when flowing in the spiral channel, and can further improve the pickling effect on the activated carbon;

[0038] 2. After pickling is completed, the activated carbon slurry flows 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. During this process, when the activated carbon slurry flows to the first filter screen, the acid solution passes through the first filter screen and flows back to the acid solution recovery pool through the acid solution recovery pipe. The activated carbon residue, under the impact of the subsequent activated carbon slurry, continues to slide along the inclined surface of the connecting pipe to the second filter screen. The activated carbon residue on the second filter screen can continue to filter out the residual acid solution. At the same time, multiple strip nozzles spray multiple water curtains. On the one hand, it can preliminarily wash the activated carbon residue on the second filter screen to reduce the content of residual acid solution in the activated carbon residue, and the washed filtrate is recovered through the primary washing liquid recovery pipe. On the other hand, the inclined strip nozzles can wash the activated carbon residue on the second filter screen towards the lower end of the connecting pipe in sequence, so that the activated carbon residue after primary water washing can smoothly flow to the joint of the second filter screen and the bottom wall of the lower end of the connecting pipe, and under the flushing of the flushing water sprayed by the water washing nozzle, it can smoothly flow into the water washing cylinder;

[0039] 3. Through the setting of the throwing plate, the activated carbon slurry output from the pickling spiral channel has a certain initial kinetic energy and is sprinkled 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 endow the activated carbon slurry with kinetic energy in the inclined direction of the connecting pipe, so that the filtered activated carbon residue can flow towards the second filter screen as much as possible. And because multiple air nozzles are also set in the gap under the throwing plate, it can further endow the activated carbon slurry and the filtered activated carbon residue with more kinetic energy in the inclined direction of the connecting pipe to ensure that the activated carbon residue on the first filter screen can smoothly flow to the second filter screen and smoothly enter the water washing cylinder under the flushing of multiple strip nozzles and multiple water washing nozzles, ensuring the smooth connection of the pickling process and the water washing process;

[0040] 4. With the setting of structures such as the first electromagnetic valve and the backwashing nozzle, when the solution in the water washing spiral channel is acidic, the alkali liquid dropping device automatically drops alkali liquid into the intercepting area, and under the action of the clear water sprayed by the backwashing nozzle, the solution in the intercepting section can be reversely pushed, which can greatly promote the mixing efficiency of the dropped alkali liquid and the solution; and when the solution in the intercepting section overflows, it can overflow to the second filter screen and flow out through the primary washing liquid recovery pipe, without interfering with the upstream pickling process. Therefore, on the basis of ensuring the water washing quality, it can ensure that the pickling process does not stop, effectively ensuring the production efficiency of activated carbon. Description of the Drawings

[0041] Figure 1 is the overall structural sectional view of the embodiment of the present application;

[0042] Figure 2 is Figure 1 the partial enlarged schematic view of part A in

[0043] Figure 3Yes Figure 1 A partial enlarged schematic view of part B in it.

[0044] Explanation of the reference numerals in the drawings:

[0045] 1. Pickling cylinder; 11. Pickling chamber; 12. First spiral partition; 13. Pickling spiral channel; 14. Feed pipe; 15. Spiral stirring plate

[0046] 2. Water washing cylinder; 21. Water washing chamber; 22. Second spiral partition; 23. Water washing spiral channel; 24. Discharge pipe

[0047] 3. Connecting pipeline; 311. First filter screen; 312. Acid liquid recovery pipe; 321. Second filter screen; 322. Primary water washing liquid recovery pipe; 33. Throw flow plate; 34. Jet nozzle

[0048] 41. Water washing spray head; 42. Strip nozzle; 43. Backwash spray head

[0049] 51. Front-end pH meter; 52. Rear-end pH meter; 53. Alkaline liquid dropping device

[0050] 61. First solenoid valve; 62. Second solenoid valve; 63. Third solenoid valve

[0051] 71. Feed pump; 72. Centrifuge; 73. Acid liquid recovery tank; 74. Electrode mesh; 75. Acid liquid reuse pipeline Specific implementation manners

[0052] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0053] An embodiment of the present application discloses a production device for nano-microporous high specific surface area activated carbon. Referring to Figure 1 and Figure 2 , it includes:

[0054] A pickling cylinder 1, the cylinder wall of which has a pickling chamber 11. A first spiral partition 12 is arranged in the pickling cylinder 1 in the pickling chamber 11, and the first spiral partition 12 divides the pickling chamber 11 into a pickling spiral channel 13;

[0055] A water washing cylinder 2, the cylinder wall of which has a water washing chamber 21. A second spiral partition 22 is arranged in the water washing cylinder 2 in the water washing chamber 21, and the second spiral partition 22 divides the water washing chamber 21 into a water washing spiral channel 23; wherein the water washing cylinder 2 is arranged inside the pickling cylinder 1, which can greatly save the floor space of the device.

[0056] A connecting pipe 3 is used to connect the upper parts of the pickling spiral channel 13 and the water washing spiral channel 23. The connecting pipe 3 is inclined, with its higher end connected to the pickling cylinder 1 and its lower end connected to the water washing cylinder 2;

[0057] A feed pipe 14 is connected to the pickling cylinder 1 and communicates with the lower part of the pickling spiral channel 13. A feeding pump 71 is arranged on the feed pipe 14 to pump the mixed slurry of activated carbon and acid solution into the pickling spiral channel 13;

[0058] A discharge pipe 24 is connected to the water washing cylinder 2 and communicates with the lower part of the water washing spiral channel 23. A centrifuge 72 is connected to the discharge pipe 24 to dehydrate the activated carbon slurry after water washing to obtain wet activated carbon;

[0059] A spiral stirring plate 15 is spiral 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 a quasi-spiral state in the pickling spiral channel 13; moreover, there is a gap between the outer periphery 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.

[0060] Refer to Figure 1 and Figure 2 , on the lower end face of the connecting pipe 3, a first filter screen 311 and a second filter screen 321 are arranged in sequence from its upper end to its lower end. An acid solution recovery pipe 312 corresponding to the first filter screen 311 and a primary water washing solution recovery pipe 322 corresponding to the second filter screen 321 are connected to the connecting pipe 3; specifically, a first through hole and a second through hole are successively formed through the lower end face of the connecting pipe 3 from top to bottom, and the first filter screen 311 and the second filter screen 321 are respectively embedded in the first through hole and the second through hole.

[0061] A number of water washing spray heads 41 inclined towards the joint of the second filter screen 321 and the inner bottom wall of the lower end of the connecting pipe 3 are arranged in the connecting pipe 3. The spraying direction of the water washing spray heads 41 is in the same direction as the medium flow direction of the connecting pipe 3. The water washing spray heads 41 are connected to an external water source and can wash the pickled activated carbon residue, so that it is mixed with the washing water and enters the water washing cylinder 2.

[0062] A number of strip nozzles 42 inclined towards the second filter screen 321 are arranged in the connection pipeline 3, and the jet direction of the strip nozzles 42 is in the same direction as the medium flow direction of the connection pipeline 3; a plurality of strip nozzles 42 are provided, and the water curtains ejected by the plurality of strip nozzles 42 staggeredly cover the cross-section of the second filter screen 321. The water curtain ejected by the strip nozzles 42 intersects with the inclination direction of the connection pipeline 3. For example, the water curtains ejected by adjacent strip nozzles 42 are spaced in the length direction of the connection pipeline 3, and the sum of the dimensions in the width direction of the connection pipeline 3 is greater than the width of the connection pipeline 3 and less than twice the width of the connection pipeline 3. So that the water curtains ejected by the plurality of strip nozzles 42 can not only comprehensively wash the activated carbon slag on the second filter screen 321, but also form an intermittent scouring effect on the activated carbon slag on the second filter screen 321, avoiding blocking the downward flow trend of the activated carbon slag on the second filter screen 321, and promoting the downward flow of the activated carbon slag on the second filter screen 321 along the inclined surface of the connection pipeline 3.

[0063] Thus, when pickling and water washing the activated carbon after activation is completed, the activated carbon powder can be mixed with the acid solution to obtain an activated carbon slurry, and then pumped to the pickling spiral channel 13 through the feed pipe 14 by the feed pump 71. With the pressurized pumping of the feed pump 71, the activated carbon slurry spirally ascends from bottom to top in the pickling spiral channel 13 of the pickling cylinder 1, greatly increasing the flow formation of the activated carbon slurry in the pickling cylinder 1, and effectively improving the pickling effect on the activated carbon; and, since a spiral stirring plate 15 spirally wound and adapted thereto is also arranged in the pickling spiral channel 13, the activated carbon slurry also has a flow form similar to a spiral state when flowing in the spiral channel, further increasing the flow stroke of the activated carbon slurry, and greatly promoting the turbulent flow state of the activated carbon slurry when flowing in the spiral channel, making the mixing of the activated carbon powder and the acid solution in the activated carbon slurry more intense and sufficient, and thus further improving the pickling effect on the activated carbon.

[0064] After pickling is completed, the activated carbon slurry flows 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 gravitational potential energy. During this process, when the activated carbon slurry flows onto the first filter screen 311, the acid solution passes through the first filter screen 311 and flows back to the acid solution recovery tank 73 through the acid solution recovery pipe 312, while the activated carbon residue slides 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 out the residual acid solution. At the same time, multiple strip nozzles 42 spray multiple water curtains. On the one hand, it can preliminarily wash the activated carbon residue on the second filter screen 321 to reduce the content of residual acid solution in the activated carbon residue, and the filtered liquid after washing is recovered through the primary water washing liquid recovery pipe 322; on the other hand, the inclined strip nozzles 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 primary water washing can smoothly flow to the joint of the second filter screen 321 and the bottom wall of the lower end of the connecting pipe 3, and under the flushing of the washing water sprayed by the water washing nozzle 41, it can smoothly flow into the water washing cylinder 2.

[0065] The activated carbon residue and the washing water that enter the water washing cylinder 2 further flow in the water washing spiral channel 23. Based on the setting of the water washing spiral channel 23, the flow formation of the activated carbon residue and the washing water can also be greatly increased in a limited space, making the water washing effect of the washing water on the activated carbon residue better. After water washing is completed, the activated carbon residue enters the centrifuge 72 together with the washing water for centrifugal dehydration. After dehydration is completed, the obtained wet activated carbon material is dried to obtain the finished activated carbon.

[0066] Thus, through the activated carbon production device of the present application, the activated carbon can be continuously pickled and washed, and the pickling and washing effects can be effectively ensured, greatly improving the production efficiency of the activated carbon. The overall device occupies a small space and has a low operation cost; and the acid solution after pickling is recovered into the acid solution recovery tank 73, and after pH adjustment and corresponding treatment, it can continue to flow back for pickling, and the effective recycling of the acid solution resources can be realized to save resources and reduce environmental pollution.

[0067] Furthermore, to facilitate the smooth flow of the activated carbon residue on the first filter screen 311 to the second filter screen 321, referring to Figure 1 and Figure 2 , a throwing plate 33 is provided at the connection part of the connecting pipe 3 and the pickling cylinder 1, and the angle between the throwing plate 33 and the bottom wall of the upper end of the connecting pipe 3 is an acute angle. And, a plurality of air nozzles 34 pointing to the first filter screen 311 are provided at the gap between the throwing plate 33 and the bottom wall of the upper end of the connecting pipe 3, and the air nozzles 34 are communicated with an external high-pressure air source.

[0068] Thus, by arranging the flow deflector 33, the activated carbon slurry output from the pickling spiral channel 13 has a certain initial kinetic energy and is sprinkled 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 endow the activated carbon slurry with kinetic energy in the inclined direction of the connecting pipe 3, so that the filtered activated carbon residue can flow onto the second filter screen 321 as much as possible. Moreover, since a plurality of air nozzles 34 are arranged in the gap below the flow deflector 33, more kinetic energy can be further imparted 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 smoothly flow onto 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, ensuring the smooth connection of the pickling process and the water washing process.

[0069] In addition, considering that during the water washing process, the activated carbon residue still has a certain weak acidity, in order to reduce the impact on the quality of the finished activated carbon, with reference to Figure 1 and Figure 3 , a front-end pH meter 51 and a rear-end pH meter 52 are arranged in sequence along the medium flow direction of the water washing spiral channel 23 in the water washing cylinder 2. A lye dropping device 53 is arranged between the front-end pH meter 51 and the rear-end pH meter 52 in the water washing spiral channel 23. The lye dropping device 53 is a conventional technology and will not be elaborated here. The lye dropping 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.

[0070] 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 lye dropping device 53 to drop a first dose of lye; and when the rear-end pH meter 52 detects that the solution in the water washing spiral channel 23 is acidic, control the lye dropping device 53 to drop a second dose of lye, the first dose being greater than the second dose. The addition of the first dose of lye and the addition of the second dose of lye 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 lye dropped by the lye dropping device 53 is the sum of the first dose and the second dose. In addition, the setting of the first dose depends on the determination after the equipment is put into trial operation to ensure that the single addition of the first dose of lye in the continuous stable working state 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 according to 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 rate data of the flow meter. This selection control process is a conventional technology and will not be elaborated here.

[0071] Moreover, a necking member is fixedly connected to the inner wall of the water washing cylinder 2 corresponding to the lye dropping device 53. The cross-sectional area of the water washing spiral channel 23 corresponding to the necking member is smaller than that of the other parts of the water washing spiral channel 23. The necking member can be one or more necking plates fixedly connected to the inner wall of the water washing cylinder 2, or a complete necking cone cylinder, so as to reduce the flow channel diameter when the solution in the water washing spiral channel 23 flows to this place.

[0072] Meanwhile, referring to Figure 1 and Figure 3 a first solenoid valve 61 is arranged downstream of the pH meter 52 at the rear end in the water washing cylinder 2. The first solenoid valve 61 can be used to open and stop the water washing spiral channel 23. A second solenoid valve 62 is arranged on the pipeline of the water washing nozzle 41. Both the first solenoid valve 61 and the second solenoid valve 62 are connected to the neutralization controller for control;

[0073] The neutralization controller is further configured to: when the pH meter 52 at the rear end 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

[0074] when the pH meter 52 at the rear end detects that the solution in the water washing spiral channel 23 is neutral, control the first solenoid valve 61 to open and control the second solenoid valve 62 to open with a delay.

[0075] Thus, during the process that the washing water sprayed by the water washing nozzle 41 carries the activated carbon residue and flows in the water washing spiral channel 23 for water washing, the front-end pH meter 51 detects the pH value of the solution in the water washing spiral channel 23, and controls the lye dropping device 53 to drop the first dose of lye into the water washing spiral channel 23 by means of the neutralization controller, so as to neutralize the solution in the water washing spiral channel 23 and reduce the quality impact on the activated carbon residue. The rear-end pH meter 52 arranged downstream then rechecks the pH value of the solution after the lye is dropped. If the solution is still acidic, it means that the amount of lye dropped by the lye dropping device 53 is small, and the second dose can be supplemented or superimposed for lye dropping, so that the solution in the rear section of the water washing spiral channel 23 is as neutral as possible.

[0076] Among them, once the rear-end pH meter 52 rechecks 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 cannot continue to flow and accumulates in the section of the water washing spiral channel 23 from the first solenoid valve 61 to its top position, which is regarded as the cut-off section. At this time, after the lye dropping device 53 is controlled to drop lye into the water washing spiral channel 23, the solution in this part of the cut-off section can be neutralized and adjusted; after the adjustment is completed and the rear-end pH meter 52 rechecks and shows that the solution is neutral or nearly neutral, the first solenoid valve 61 is controlled to open again, so that this part of the solution continues to flow 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.

[0077] Further, to promote the efficiency of the solution in the stopped section in the water-washed spiral channel 23 during neutralization adjustment, referring to Figure 1 and Figure 3 , a backflush nozzle 43 communicating with an external water source is further provided in the water-washing cylinder 2. The spraying direction of the backflush nozzle 43 is reverse to the medium flow direction of the water-washed spiral channel 23. The backflush nozzle 43 is arranged downstream of the alkali liquid dropping device 53, and a third electromagnetic valve 63 is arranged on the pipeline of the backflush nozzle 43;

[0078] The neutralization controller is further configured to: when it controls the second electromagnetic valve 62 to close, control the third electromagnetic valve 63 to open.

[0079] Thus, when the first electromagnetic valve 61 closes to stop the solution in the water-washed spiral channel 23, the second electromagnetic valve 62 also closes to stop the water-washing nozzle 41 from continuously supplementing flushing water into the stopped section. At this time, the third electromagnetic valve 63 opens, and the backflush nozzle 43 sprays clean water into the water-washed spiral channel 23, so that it flushes along the direction reverse to the medium flow direction of the water-washed spiral channel 23, which can reversely push the solution in the stopped section, and can greatly promote the mixing efficiency of the dropped alkali liquid and the solution; and after the solution in the stopped section overflows, it can overflow to the second filter screen 321 and flow out through the primary water-washed liquid recovery pipe 322, without interfering with the upstream pickling process. Therefore, on the basis of ensuring the water-washing quality, the pickling process can be ensured not to stop, and the production efficiency of activated carbon can be effectively ensured.

[0080] In addition, to further improve the acid liquid recovery effect and ensure the pickling effect, referring to Figure 1 , in another feasible embodiment, an electrode grid 74 can also be provided in the acid liquid recovery tank 73. The electrode grid 74 divides the acid liquid recovery tank 73 into left and right parts. By energizing the electrode grid 74, heavy metal ions in the pickled acid liquid can be removed. The discharge port of the acid liquid recovery pipe 312 and the liquid inlet port of the acid liquid reuse pipeline 75 are located on both sides of the electrode grid 74. By connecting the acid liquid reuse pipeline 75 with the feed pipe 14, the recycling of the acid liquid can be realized. When necessary, a pH meter and an acid liquid dropping device can also be provided in the acid liquid reuse pipeline 75 to adjust the pH value of the recycled acid liquid to ensure that it meets the production requirements.

[0081] The embodiment of the present application discloses a production method of 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 , it includes the following steps:

[0082] S1. Crush and screen the high-carbon raw material, and activate it to obtain nano-microporous high specific surface area activated carbon. The specific activation method is a conventional technology and will not be elaborated here;

[0083] S2. Mix the activated carbon in step S1 with the acid solution to obtain an activated carbon slurry, and pump the activated carbon slurry into the pickling spiral channel 13 through the feed pipe 14;

[0084] S3. When the activated carbon slurry spirally ascends in the pickling spiral channel 13, the activated carbon and the acid solution in the activated carbon slurry are fully mixed by the spiral stirring flow of the spiral stirring plate 15 to complete pickling;

[0085] S4. The pickled activated carbon slurry flows into the connecting pipe 3 and is filtered successively through the first filter screen 311 and the second filter screen 321. The acid solution filtered through the first filter screen 311 converges into the acid solution recovery pipe 312, and the activated carbon residue slides onto the second filter screen 321 along the inclined trend of the connecting pipe 3. The activated carbon residue on the second filter screen 321 is rinsed, so that the rinsing water carries the activated carbon residue and flows through the lower part of the connecting pipe 3 into the water washing cylinder 2;

[0086] S5. The rinsing water carries the activated carbon residue and is fully mixed in the water washing spiral channel 23 to complete water washing;

[0087] S6. Dehydrate and dry the water-washed activated carbon residue to obtain the finished activated carbon.

[0088] Among them, in step S5, when performing 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 through the alkali solution adding device, so that the solution finally output from the water washing spiral channel 23 is neutral or nearly neutral.

[0089] The implementation principle of the nano-microporous high specific surface area activated carbon production device in the embodiment of the present application is as follows:

[0090] During the pickling and water washing processes of the activated carbon, the activated carbon powder is mixed with the acid solution to obtain an activated carbon slurry, and then it is pumped into the pickling spiral channel 13 through the feed pipe 14 by the feeding pump 71. With the pressurized pumping of the feeding pump 71, the activated carbon slurry spirally ascends from bottom to top in the pickling spiral channel 13 of the pickling cylinder 1. With the aid of the setting of the spiral stirring plate 15, the activated carbon slurry also has a spiral-like flow form when spirally flowing in the spiral channel, which not only increases the flow stroke of the activated carbon slurry, but also greatly promotes the turbulent flow state of the activated carbon slurry when flowing in the spiral channel, and can further improve the pickling effect on the activated carbon.

[0091] After pickling is completed, the activated carbon slurry flows 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 gravitational potential energy. During this process, when the activated carbon slurry flows onto the first filter screen 311, the acid solution passes through the first filter screen 311 and flows back to the acid solution recovery tank 73 through the acid solution recovery pipe 312. The activated carbon residue, under the impact of the subsequent activated carbon slurry, continues to slide along the inclined plane of the connecting pipe 3 to the second filter screen 321. The activated carbon residue on the second filter screen 321 can continue to filter out the residual acid solution. At the same time, multiple strip nozzles 42 spray multiple water curtains. On the one hand, it can initially wash the activated carbon residue on the second filter screen 321 to reduce the content of residual acid solution in the activated carbon residue, and the filtered liquid after washing is recovered through the primary water washing liquid recovery pipe 322. On the other hand, the inclined strip nozzles 42 can wash the activated carbon residue on the second filter screen 321 towards the lower end of the connecting pipe 3 in sequence, so that the activated carbon residue after initial water washing can smoothly flow to the joint of the second filter screen 321 and the bottom wall of the lower end of the connecting pipe 3, and under the flushing of the flushing water sprayed by the water washing nozzle 41, it can smoothly flow into the water washing cylinder 2.

[0092] The activated carbon residue and the flushing water that enter the water washing cylinder 2 further flow in the water washing spiral channel 23. Due to the setting of the water washing spiral channel 23, it can also greatly increase the flow formation of the activated carbon residue and the flushing water in a limited space, making the water washing effect of the flushing water on the activated carbon residue better. After water washing is completed, the activated carbon residue enters the centrifuge 72 together with the flushing water for centrifugal dehydration. After dehydration is completed, the obtained wet activated carbon material is dried to obtain the finished activated carbon.

[0093] Moreover, with the settings of structures such as the first electromagnetic valve 61 and the backwashing nozzle 43, when the solution in the water washing spiral channel 23 is acidic, the alkali liquid dropping device 53 automatically drops alkali liquid into the cut-off area, and under the action of the clear water sprayed by the backwashing nozzle 43, it can reverse the flow of the solution in the cut-off section, which can greatly promote the mixing efficiency of the dropped alkali liquid and the solution. And when the solution in the cut-off area overflows, it can overflow to the second filter screen 321 and flow out through the primary water washing liquid recovery pipe 322, without interfering with the pickling process upstream. Therefore, on the basis of ensuring the water washing quality, it can ensure that the pickling process does not stop, and can effectively ensure the production efficiency of activated carbon.

[0094] Thus, through the activated carbon production device of the present application, continuous pickling and water washing of activated carbon can be carried out, and the pickling and water washing effects can be effectively ensured, greatly improving the production efficiency of activated carbon. And the acid solution after pickling is recovered to the acid solution recovery tank 73, and after pH adjustment and corresponding treatment, it can continue to flow back for pickling, realizing the effective recycling and reuse of acid solution resources, so as to save resources and reduce environmental pollution.

[0095] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are merely used to distinguish different components. The terms such as "a" or "an" do not denote a quantity limitation either, but mean that there is at least one. The terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms such as "upper", "lower", "left", "right" etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0096] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A production device for nano-microporous activated carbon with high specific surface area, characterized in that, Comprising: A pickling cylinder (1) whose cylinder wall has a pickling cavity (11). A first spiral partition plate (12) is arranged in the pickling cavity (11) of the pickling cylinder (1), and the first spiral partition plate (12) divides the pickling cavity (11) into a pickling spiral channel (13); A water-washing cylinder (2) whose cylinder wall has a water-washing cavity (21). A second spiral partition plate (22) is arranged in the water-washing cavity (21) of the water-washing cylinder (2), and the second spiral partition plate (22) divides the water-washing cavity (21) into a water-washing spiral channel (23); A connecting pipe (3) for connecting the upper parts 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); A feed pipe (14) connected to the pickling cylinder (1) and communicating with the lower part of the pickling spiral channel (13); A discharge pipe (24) connected to the water-washing cylinder (2) and communicating with the lower part of the water-washing spiral channel (23); A spiral stirring plate (15) which is spiral and spirally wound in the pickling spiral channel (13); On the lower end face of the connecting pipe (3), a first filter screen (311) and a second filter screen (321) are arranged in sequence from its upper end to its lower end. 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); A plurality of water-washing spray heads (41) inclined and pointing to the joint of the second filter screen (321) and the inner bottom wall of the lower end of the connecting pipe (3) are arranged in the connecting pipe (3). The spraying direction of the water-washing spray heads (41) is in the same direction as the medium flow direction of the connecting pipe (3), and the water-washing spray heads (41) are communicated with an external water source.

2. The production device of nano-microporous high specific surface area activated carbon according to claim 1, characterized in that, A plurality of strip-shaped nozzles (42) inclined and pointing to 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 production device of nano-microporous activated carbon with high specific surface area according to claim 2, wherein A plurality of the strip-shaped nozzles (42) are provided, and the cross-section of the second filter screen (321) is covered in an interleaved manner by the water curtains sprayed by the plurality of strip-shaped nozzles (42).

4. A production device for nano-microporous activated carbon with high specific surface area according to claim 1, characterized in that, A throw plate (33) is arranged at the connection part of the connecting pipe (3) and the pickling cylinder (1). The included angle between the throw plate (33) and the upper end bottom wall of the connecting pipe (3) is an acute angle.

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

6. A production device for nano-microporous activated carbon with a high specific surface area according to any one of claims 1-5, characterized in that, A front - end pH meter (51) and a rear - end 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 - liquid dropping device (53) is arranged between the front - end pH meter (51) and the rear - end pH meter (52) in the water - washing spiral channel (23). The alkali - liquid dropping 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). 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 - liquid dropping device (53) to drop a first dose of alkali liquid; and when the rear - end pH meter (52) detects that the solution in the water - washing spiral channel (23) is acidic, control the alkali - liquid dropping device (53) to drop a second dose of alkali liquid, where the first dose is greater than the second dose.

7. The production device of nano-microporous high specific surface area activated carbon according to claim 6, characterized in that, A closing piece is fixedly connected to the inner wall of the water - washing cylinder (2) corresponding to the alkali - liquid dropping device (53), and the cross - sectional area of the water - washing spiral channel (23) corresponding to the closing piece is smaller than the cross - sectional area of the other parts of the water - washing spiral channel (23).

8. A production device for nano-microporous activated carbon with a high specific surface area according to claim 6, characterized in that, A first solenoid valve (61) is arranged downstream of the rear - end pH meter (52) in the water - washing cylinder (2), and a second solenoid valve (62) is arranged on the pipeline of the water - washing spray head (41). Both the first solenoid valve (61) and the second solenoid valve (62) are controlled and 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, control the first solenoid valve (61) to open and control the second solenoid valve (62) to open with a delay.

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

10. A production method of nano-microporous activated carbon with high specific surface area, based on a production device of nano-microporous activated carbon with high specific surface area according to any one of claims 1-9, characterized in that, Including the following steps: S1. Crush and screen the high - carbon raw material, and activate it to obtain nano - microporous high - specific - surface - area activated carbon; S2. Mix the activated carbon in step S1 with acid liquid to obtain an activated - carbon slurry, and pump the activated - carbon slurry through the feed pipe (14) into the pickling spiral channel (13); S3. When the activated - carbon slurry spirally ascends in the pickling spiral channel (13), through the spiral agitation flow of the spiral stirring plate (15), the activated carbon and the acid liquid in the activated - carbon slurry are fully mixed to complete pickling; S4. The activated carbon slurry after pickling flows into the connection pipe (3) and is filtered successively through the first filter screen (311) and the second filter screen (321). The acid solution filtered by the first filter screen (311) converges into the acid solution recovery pipe (312), and the activated carbon residue slides along the inclined trend of the connection pipe (3) onto the second filter screen (321). The activated carbon residue on the second filter screen (321) is rinsed, so that the rinsing water carries the activated carbon residue and flows through the lower part of the connection pipe (3) into the water washing cylinder (2); S5. The rinsing water carrying the activated carbon residue is fully mixed in the water washing spiral channel (23) to complete the water washing; S6. The activated carbon residue after water washing is dehydrated and dried to obtain the finished activated carbon.

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