CN108101054B - Preparation method of supercapacitor activated carbon with controllable specific surface area - Google Patents
Preparation method of supercapacitor activated carbon with controllable specific surface area Download PDFInfo
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Abstract
The invention disclosesA preparation method of supercapacitor activated carbon with controllable specific surface area is provided, which comprises the following steps: s1, coconut shell pretreatment: cutting coconut shells with the water content of 15-17% into strips with the length of 1-2cm by a cutting device, placing the strips into a crusher for crushing treatment to obtain crushed materials, grinding the crushed materials into flowing powder by airflow to obtain dry powder, and extruding the dry powder into spherical materials to obtain pretreated coconut shells; s2, dry distillation and carbonization: placing the pretreated coconut shells in a carbonization furnace to obtain a carbonized material; s3, stirring to remove impurities to obtain a stirred material; s4, primary pore forming; s5, reaming again to obtain a coarse material; and S6, physically removing impurities to obtain a finished product. The invention takes coconut shell as raw material, adopts physical method production in the whole process, ensures the cleanliness of carbon material, regulates and controls the aperture of the carbon material, and prepares finished product super activated carbon with total specific surface area of 2000-2200m2The specific capacitance is 60-80F/g.
Description
Technical Field
The invention relates to the field of preparation of super activated carbon. More specifically, the invention relates to a preparation method of supercapacitor activated carbon with controllable specific surface area.
Background
Supercapacitors are a new type of electrical energy storage device that uses electrical double layers or two-dimensional/quasi-two-dimensional faradaic reactions occurring at the electrode/electrolyte interface to store energy. According to the working principle of the super capacitor, in order to enable the super capacitor to obtain larger capacity, the electrode material needs to have the characteristics of chemical inertness, large specific surface area, good conductivity, high purity and the like, at present, the most used electrode material is a porous carbon material, and comprises activated carbon powder, activated carbon fiber, carbon nano tube and carbon aerogel, wherein the source of the activated carbon powder can be biomass, green and pollution-free are ensured from the original point, and the super capacitor has unique advantages incomparable to lithium batteries.
However, the currently marketed activated carbon is certainly few as an electrode material, and firstly, the activated carbon is prepared by a chemical method or a chemical and physical combined method in the preparation process, so that the cleaning is difficult; secondly, the aperture of the activated carbon is difficult to control, the adsorption force of the carbon surface with too large aperture is reduced, the effectiveness of forming an electric double layer by adsorbing electrolyte ions is reduced, the reduction of specific surface area is accompanied by the too large aperture, the aperture is too small, the electrolyte ions cannot enter pores, or the migration diffusion speed is slow and difficult to reach the carbon surface, and the electric double layer cannot be formed, so how to regulate and control the aperture of the carbon material while ensuring the cleanliness of the carbon material, the utilization rate of the surface area is improved, and an effective electric double layer capacitor is formed, which is a problem that needs to be solved urgently at present.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a preparation method of the supercapacitor activated carbon with controllable specific surface area, which takes renewable resource coconut shell as raw material, adopts a physical method to produce in the whole process, ensures the cleanliness of the carbon material, regulates and controls the aperture of the carbon material, and prepares the finished product of the supercapacitor activated carbon with the total specific surface area of 2000-2200m2The specific capacitance is 60-80F/g.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for preparing a supercapacitor activated carbon having a controllable specific surface area, comprising the steps of:
s1, coconut shell pretreatment: cutting the dried coconut shell with the water content of 15-17% into strips with the length of 1-2cm by a cutting device, placing the strips into a crusher for crushing treatment, sieving the strips by a sieve with 80-90 meshes to obtain crushed materials, grinding the crushed materials into flowing powder by airflow, drying the flowing powder for 30-40min at the temperature of 90-100 ℃ to obtain dry powder, and extruding the dry powder into spherical materials with the diameter of 0.5cm by a plastic forming device to obtain the pretreated coconut shell;
s2, dry distillation and carbonization: placing the pretreated coconut shell in a carbonization furnace, controlling the initial temperature in the carbonization furnace to be 80 ℃, heating to 100 ℃ per minute at 10 ℃ for reaction for 20-30 min, heating to 400 ℃ at the speed of heating to 100 ℃ per minute for reaction for 1-2h, heating to 700 ℃ in the carbonization furnace at the speed of 50 ℃ per hour, continuing the reaction for 23-25 h, heating to 900 ℃ in the carbonization furnace at the speed of heating to 150 ℃ per hour, reacting for 0.8-1 h, and cooling to room temperature in the carbonization furnace at the speed of 300 ℃ per hour to obtain a carbonized material;
s3, stirring and removing impurities: placing the carbonized material in a stirrer, regulating the rotation speed of the stirrer to 60r/min, stirring for 40-50min, placing the carbonized material after stirring and impurity removal in a crusher, crushing, and sieving with a 50-60 mesh sieve to obtain a stirred material;
s4, primary pore forming: placing the stirred material in an activation furnace, introducing high-temperature steam, and controlling the flow rate of the high-temperature steam to be 2.8-3.3m3H, the pressure is 3.8-4.3MPa, the temperature is 1180-1250 ℃, and the reaction lasts for 11-13 h;
s5, reaming again: introducing mixed gas of combustible gas and high-temperature water vapor into the activation furnace, and controlling the flow velocity of the mixed gas to be 2.8-3.3m3The reaction is continued for 11 to 13 hours at the pressure of 3.8 to 4.3MPa and the temperature of 1180 and 1250 ℃ to obtain a crude material;
s6, physical impurity removal: and (3) placing the coarse material into a suspension device for wet floatation and impurity removal, and then crushing to obtain a finished product.
Preferably, the stirrer comprises a stirring barrel with a motor arranged at the top, and a stirring shaft connected with the motor and axially arranged along the stirring barrel, wherein a plurality of groups of blades are arranged on the stirring shaft at intervals from top to bottom, each group of blades is four blades arranged at equal intervals, two adjacent groups of blades are not overlapped in the vertical direction, the blades are cylindrical rod bodies, bristles made of nylon wires are arranged on the peripheries of the blades in a radiation manner, the free ends of the bristles are ground to be round, and the length of the bristles is equal to 0.2 cm;
the stirring barrel is characterized in that the bottom end of the stirring barrel is downwards condensed to form a waste outlet, a filter screen is obliquely clamped at the upper end of the outlet at the lower end of the stirring shaft, the side wall of the stirring barrel is positioned above the lowest end of the filter screen and is provided with a stirring material outlet, and the aperture of the filter screen is 0.3-0.5 mm.
Preferably, the combustible gas in the mixed gas is methane.
Preferably, the volume ratio of the methane to the high-temperature steam in the mixed gas is 1: 2-3.
Preferably, the flow rate of the high-temperature steam is controlled to 3m in step S43Reaction for 12 hours at the pressure of 4MPa and the temperature of 1200 ℃; the flow rate of the mixed gas was controlled to 3m in step S53The reaction is continued for 12 hours at the pressure of 4MPa and the temperature of 1200 ℃.
Preferably, in step S6, the mass ratio of water to coarse material in the suspension device is controlled to be 9:1, the flow rate of water is increased from 10m/S to 20m/S at a speed of 2m/S and then is decreased from 20m/S to 10m/S at a speed of 1m/S, and the circulation is repeated in sequence.
Preferably, the suspension device in the step S6 is a horizontal spiral cavity, and the time from the entering of the coarse material into the suspension device to the exiting of the coarse material from the suspension device is 10-20S.
The invention at least comprises the following beneficial effects:
firstly, the coconut shell which is a renewable resource is used as a raw material, the coconut shell carbon has high mechanical strength, compact internal structure, higher bulk density and less ash content in the coconut shell, the whole process from raw material treatment to finished product adopts a physical method for production, the process is pollution-free, the cost is low, the specific surface area of the finished product is high, the pore diameter of micropores is controllable and clean, and the total specific surface area of the prepared finished product super activated carbon is 2000-2200m2The specific capacitance is 60-80F/g, and the internal resistance is extremely low;
secondly, crushing the dried coconut shells in the coconut shell pretreatment process, extruding the crushed coconut shells into a spherical shape, and sintering the spherical materials, wherein the compactness of the spherical materials can be effectively improved by sintering before carbonization, the grain size and the pore size of the spherical materials are improved, the content of aerogel (combustible gas such as methane generated by decomposition of the coconut shells) in the carbonized materials is controlled to be 23-26% while the carbonized materials obtain a fixed three-dimensional net-shaped structure by combining the treatment in the later carbonization process, the control on the content of the aerogel can effectively occupy the inner space of the carbonized coconut shells, and a foundation is laid for the later pore-forming and hole-expanding treatment;
thirdly, the development of micropores is strictly controlled and regulated through the control of the flow rate, the temperature, the pressure and the like of water vapor in the processes of primary pore forming and re-reaming, and meanwhile, compared with the process of introducing inert gas to manufacture a lean oxygen environment in the prior art, in the process of re-reaming, the combustible gas is introduced to burn to consume oxygen in the cremation furnace on one hand, and on the other hand, the combustible gas is burnt to provide sufficient energy for the re-expansion of the pore diameter and improve the activation reaction, and the ash content of the coconut shell contains sylvite which can also promote the activation reaction;
fourthly, after carbonization, the mixture is introduced into a stirrer to remove impurities on the surface of the stirring friction, and then the impurities are removed and purified through a suspension device after hole expansion, so that the cleanliness of finished products is ensured compared with the traditional impurity removal mode.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
< example 1>
A preparation method of supercapacitor activated carbon with controllable specific surface area comprises the following steps:
s1, coconut shell pretreatment: cutting the dried coconut shell with the water content of 15-17% into strips with the length of 1-2cm by a cutting device, placing the strips into a crusher for crushing treatment, sieving the strips by a sieve of 80 meshes to obtain crushed materials, grinding the crushed materials into flowing powder by airflow, drying the flowing powder for 40min at the temperature of 90 ℃ to obtain dry powder, extruding the dry powder into spherical materials with the diameter of 0.5cm by a plastic molding device to obtain the pretreated coconut shell;
s2, dry distillation and carbonization: placing the pretreated coconut shell in a carbonization furnace, controlling the initial temperature in the carbonization furnace to be 80 ℃, heating to 100 ℃ per minute at 10 ℃ for 20 min for reaction, heating to 400 ℃ at the speed of 100 ℃ per minute for reaction for 1h, heating to 700 ℃ in the carbonization furnace at the speed of 50 ℃ per hour, continuing the reaction for 25 h, heating to 900 ℃ in the carbonization furnace at the speed of 150 ℃ per hour, reacting for 0.8 h, and cooling to room temperature at the speed of 300 ℃ per hour in the carbonization furnace to obtain a carbonized material;
s3, stirring and removing impurities: placing the carbonized material in a stirrer, regulating the rotating speed of the stirrer to 60r/min, stirring for 40min, placing the carbonized material after stirring and impurity removal in a crusher to crush, and sieving with a 50-mesh sieve to obtain a stirred material;
the stirring machine comprises a stirring barrel and a stirring shaft, wherein the top of the stirring barrel is provided with a motor, the stirring shaft is connected with the motor and is axially arranged along the stirring barrel, a plurality of groups of blades are arranged on the stirring shaft at intervals from top to bottom, each group of blades is four blades which are arranged at equal intervals, two groups of blades which are adjacent from top to bottom are not overlapped along the vertical direction, the blades are cylindrical rod bodies, bristles made of nylon wires are arranged on the peripheries of the blades in a radiation mode, the free ends of the bristles are ground to be round, and the lengths of the bristles are equal to 0.2 cm;
the bottom end of the stirring barrel is downwards condensed to form a waste outlet, a filter screen is obliquely clamped at the upper end of the outlet at the lower end of the stirring shaft, a stirring material outlet is arranged above the lowest end of the filter screen on the side wall of the stirring barrel, plugs are respectively arranged at the waste outlet and the stirring material outlet in a plugging manner for sealing, and the aperture of the filter screen is 0.3 mm;
s4, primary pore forming: placing the stirred material in an activation furnace, introducing high-temperature steam, and controlling the flow velocity of the high-temperature steam to be 2.8m3Reaction for 13 hours at the pressure of 3.8MPa and the temperature of 1180 ℃;
s5, reaming again: introducing mixed gas of combustible gas and high-temperature water vapor into the activation furnace, and controlling the flow velocity of the mixed gas to be 2.8m3Reaction is continued for 13 hours at the pressure of 3.8MPa and the temperature of 1180 ℃ to obtain a crude material; wherein the combustible gas in the mixed gas is methane, and the volume ratio of the methane to the high-temperature water vapor in the mixed gas is 1: 2;
s6, physical impurity removal: placing the coarse material into a suspension device, carrying out wet flotation and impurity removal, and then crushing to obtain a finished product, wherein the mass ratio of water to the coarse material in the suspension device is controlled to be 9:1, the flow velocity of the water is increased from 10m/s to 20m/s at the speed of 2m/s, then is reduced from 20m/s to 10m/s at the speed of 1m/s, and the steps are sequentially circulated in a reciprocating manner;
the suspension device is a cavity which is horizontally and spirally arranged, and the time from the coarse material entering the suspension device to the coarse material flowing out of the suspension device is 10 s.
< example 2>
A preparation method of supercapacitor activated carbon with controllable specific surface area comprises the following steps:
s1, coconut shell pretreatment: cutting the dried coconut shell with the water content of 15-17% into strips with the length of 1-2cm by a cutting device, placing the strips into a crusher for crushing treatment, sieving the strips by a sieve of 80 meshes to obtain crushed materials, grinding the crushed materials into flowing powder by airflow, drying the flowing powder for 35min at the temperature of 95 ℃ to obtain dry powder, extruding the dry powder into spherical materials with the diameter of 0.5cm by a plastic forming device to obtain the pretreated coconut shell;
s2, dry distillation and carbonization: placing the pretreated coconut shell in a carbonization furnace, controlling the initial temperature in the carbonization furnace to be 80 ℃, heating to 100 ℃ per minute at 10 ℃ for reaction for 25 min, heating to 400 ℃ at the speed of 100 ℃ per minute for reaction for 1.5h, heating to 700 ℃ in the carbonization furnace at the speed of 50 ℃ per hour, continuing the reaction for 24 h, heating to 900 ℃ in the carbonization furnace at the speed of 150 ℃ per hour, reacting for 0.9 h, and cooling to room temperature at the speed of 300 ℃ per hour in the carbonization furnace to obtain a carbonized material;
s3, stirring and removing impurities: placing the carbonized material in a stirrer, regulating the rotating speed of the stirrer to be 60r/min, stirring for 45min, placing the carbonized material after stirring and impurity removal in a crusher to crush, and sieving with a 60-mesh sieve to obtain a stirred material;
the stirring machine comprises a stirring barrel and a stirring shaft, wherein the top of the stirring barrel is provided with a motor, the stirring shaft is connected with the motor and is axially arranged along the stirring barrel, a plurality of groups of blades are arranged on the stirring shaft at intervals from top to bottom, each group of blades is four blades which are arranged at equal intervals, two groups of blades which are adjacent from top to bottom are not overlapped along the vertical direction, the blades are cylindrical rod bodies, bristles made of nylon wires are arranged on the peripheries of the blades in a radiation mode, the free ends of the bristles are ground to be round, and the lengths of the bristles are equal to 0.2 cm;
the bottom end of the stirring barrel is downwards condensed to form a waste outlet, a filter screen is obliquely clamped at the upper end of the outlet at the lower end of the stirring shaft, a stirring material outlet is arranged above the lowest end of the filter screen on the side wall of the stirring barrel, plugs are respectively arranged at the waste outlet and the stirring material outlet in a plugging manner for sealing, and the aperture of the filter screen is 0.3-0.5 mm;
s4, primary pore forming: placing the stirred material in an activation furnace, introducing high-temperature steam, and controlling the flow velocity of the high-temperature steam to be 3m3Reaction for 12 hours at the pressure of 4MPa and the temperature of 1200 ℃;
s5, reaming again: introducing combustible gas and high-temperature water vapor into an activation furnaceControlling the flow velocity of the mixed gas to be 3m3Reaction is continued for 12 hours at the pressure of 4MPa and the temperature of 1200 ℃ to obtain a crude material; wherein the combustible gas in the mixed gas is methane, and the volume ratio of the methane to the high-temperature water vapor in the mixed gas is 1: 2.5;
s6, physical impurity removal: placing the coarse material into a suspension device, carrying out wet flotation and impurity removal, and then crushing to obtain a finished product, wherein the mass ratio of water to the coarse material in the suspension device is controlled to be 9:1, the flow velocity of the water is increased from 10m/s to 20m/s at the speed of 2m/s, then is reduced from 20m/s to 10m/s at the speed of 1m/s, and the steps are sequentially circulated in a reciprocating manner;
the suspension device is a cavity which is horizontally and spirally arranged, and the time from the coarse material entering the suspension device to the coarse material flowing out of the suspension device is 20 s.
< example 3>
A preparation method of supercapacitor activated carbon with controllable specific surface area comprises the following steps:
s1, coconut shell pretreatment: cutting the dried coconut shell with the water content of 15-17% into strips with the length of 1-2cm by a cutting device, placing the strips into a crusher for crushing treatment, sieving the strips by a sieve with 80-90 meshes to obtain crushed materials, grinding the crushed materials into flowing powder by airflow, drying the flowing powder for 30min at the temperature of 100 ℃ to obtain dry powder, extruding the dry powder into spherical materials with the diameter of 0.5cm by a plastic molding device to obtain the pretreated coconut shell;
s2, dry distillation and carbonization: placing the pretreated coconut shell in a carbonization furnace, controlling the initial temperature in the carbonization furnace to be 80 ℃, heating to 100 ℃ per minute at 10 ℃ for reaction for 20-30 min, heating to 400 ℃ at the speed of 100 ℃ per minute for reaction for 2h, heating to 700 ℃ in the carbonization furnace at the speed of 50 ℃ per hour, continuing the reaction for 25 h, heating to 900 ℃ in the carbonization furnace at the speed of 150 ℃ per hour, reacting for 1h, and cooling the temperature in the carbonization furnace to room temperature at the speed of 300 ℃ per hour to obtain a carbonized material;
s3, stirring and removing impurities: placing the carbonized material in a stirrer, regulating the rotating speed of the stirrer to 60r/min, stirring for 50min, placing the carbonized material after stirring and impurity removal in a crusher to crush, and sieving with a 60-mesh sieve to obtain a stirred material;
the stirring machine comprises a stirring barrel, wherein the top of the stirring barrel is provided with a motor, a stirring shaft is connected with the motor and axially arranged along the stirring barrel, a plurality of groups of blades are arranged on the stirring shaft at intervals from top to bottom, each group of blades is four blades which are arranged at equal intervals, two adjacent groups of blades are not overlapped in the vertical direction, the blades are cylindrical rod bodies, bristles made of nylon wires are arranged on the peripheries of the blades in a radiation mode, the free ends of the bristles are subjected to rounding treatment, plugs are arranged at a waste material outlet and a stirring material outlet in a plugging mode for sealing, and the length of the bristles is equal to 0.2 cm;
the bottom end of the stirring barrel is downwards condensed to form a waste outlet, a filter screen is obliquely clamped at the upper end of the outlet at the lower end of the stirring shaft, a stirring material outlet is arranged above the lowest end of the filter screen on the side wall of the stirring barrel, and the aperture of the filter screen is 0.5 mm;
s4, primary pore forming: placing the stirred material in an activation furnace, introducing high-temperature steam, and controlling the flow velocity of the high-temperature steam to be 3.3m3Reaction for 11h at the pressure of 4.3MPa and the temperature of 1180 ℃;
s5, reaming again: introducing mixed gas of combustible gas and high-temperature water vapor into the activation furnace, and controlling the flow velocity of the mixed gas to be 3.3m3Reaction is continued for 11 hours at the pressure of 4.3MPa and the temperature of 1180 ℃ to obtain a crude material; wherein the combustible gas in the mixed gas is methane, and the volume ratio of the methane to the high-temperature water vapor in the mixed gas is 1: 3;
s6, physical impurity removal: placing the coarse material into a suspension device, carrying out wet flotation and impurity removal, and then crushing to obtain a finished product, wherein the mass ratio of water to the coarse material in the suspension device is controlled to be 9:1, the flow velocity of the water is increased from 10m/s to 20m/s at the speed of 2m/s, then is reduced from 20m/s to 10m/s at the speed of 1m/s, and the steps are sequentially circulated in a reciprocating manner;
the suspension device is a cavity which is horizontally and spirally arranged, and the time from the coarse material entering the suspension device to the coarse material flowing out of the suspension device is 15 s.
Results of the experiment
1. The aerogel content in the char of examples 1-3, and the total specific surface area (m) of the finished product2Specific capacitance F/g, concrete resultsThe results are shown in table 1 below:
TABLE 1
| Example 1 | Example 2 | Example 3 | |
| Aerogel content | 26% | 25% | 23% |
| Total specific surface area (m)2/g） | 2120 | 2200 | 2086 |
| Specific capacitance F/g | 72 | 80 | 67 |
Industrial applicability
The super activated carbon of the invention takes the coconut shell which is a renewable resource as the raw material, and the whole process is produced by a physical method from the treatment of the raw material to the finished product, so the process is pollution-free, the cost is low, the specific surface area of the finished product is high, the aperture of the micropore is controllable and clean, and the super activated carbon can be industrially manufactured at low cost.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (7)
1. A preparation method of supercapacitor activated carbon with controllable specific surface area is characterized by comprising the following steps:
s1, coconut shell pretreatment: cutting the dried coconut shell with the water content of 15-17% into strips with the length of 1-2cm by a cutting device, placing the strips into a crusher for crushing treatment, sieving the strips by a sieve with 80-90 meshes to obtain crushed materials, grinding the crushed materials into flowing powder by airflow, drying the flowing powder for 30-40min at the temperature of 90-100 ℃ to obtain dry powder, and extruding the dry powder into spherical materials with the diameter of 0.5cm by a plastic forming device to obtain the pretreated coconut shell;
s2, dry distillation and carbonization: placing the pretreated coconut shell in a carbonization furnace, controlling the initial temperature in the carbonization furnace to be 80 ℃, heating to 100 ℃ per minute at 10 ℃ for reaction for 20-30 min, heating to 400 ℃ at the speed of heating to 100 ℃ per minute for reaction for 1-2h, heating to 700 ℃ in the carbonization furnace at the speed of 50 ℃ per hour, continuing the reaction for 23-25 h, heating to 900 ℃ in the carbonization furnace at the speed of heating to 150 ℃ per hour, reacting for 0.8-1 h, and cooling to room temperature in the carbonization furnace at the speed of 300 ℃ per hour to obtain a carbonized material;
s3, stirring and removing impurities: placing the carbonized material in a stirrer, regulating the rotation speed of the stirrer to 60r/min, stirring for 40-50min, placing the carbonized material after stirring and impurity removal in a crusher, crushing, and sieving with a 50-60 mesh sieve to obtain a stirred material;
s4, primary pore forming: placing the stirred material in an activation furnace, introducing high-temperature steam, and controlling the flow rate of the high-temperature steam to be 2.8-3.3m3The pressure is 3.8-4.3MPa, the temperature is 1180 and 1250 ℃, and the reaction lasts for 11-13 h;
s5, reaming again: introducing mixed gas of combustible gas and high-temperature water vapor into the activation furnace, and controlling the flow velocity of the mixed gas to be 2.8-3.3m3The reaction is continued for 11 to 13 hours at the pressure of 3.8 to 4.3MPa and the temperature of 1180 and 1250 ℃ to obtain a crude material;
s6, physical impurity removal: and (3) placing the coarse material into a suspension device for wet floatation and impurity removal, and then crushing to obtain a finished product.
2. The method for preparing the supercapacitor activated carbon with the controllable specific surface area according to claim 1, wherein the stirrer comprises a stirring barrel, a stirring shaft and a plurality of groups of blades, wherein the motor is arranged at the top of the stirring barrel, the stirring shaft is connected with the motor and is axially arranged along the stirring barrel, the stirring shaft is provided with four blades at intervals, each group of blades is four blades at equal intervals, two groups of blades adjacent to each other up and down are not overlapped in the vertical direction, the blades are cylindrical rod bodies, bristles made of nylon wires are radially arranged on the peripheries of the blades, the free ends of the bristles are ground to be round, and the length of the bristles is equal to 0.2 cm;
the stirring barrel is characterized in that the bottom end of the stirring barrel is downwards condensed to form a waste outlet, a filter screen is obliquely clamped at the upper end of the outlet at the lower end of the stirring shaft, the side wall of the stirring barrel is positioned above the lowest end of the filter screen and is provided with a stirring material outlet, and the aperture of the filter screen is 0.3-0.5 mm.
3. The method for preparing the supercapacitor activated carbon having a controllable specific surface area according to claim 1, wherein the combustible gas in the mixed gas is methane.
4. The method for preparing the supercapacitor activated carbon with the controllable specific surface area according to claim 3, wherein the volume ratio of methane to high-temperature water vapor in the mixed gas is 1: 2-3.
5. The method for preparing the supercapacitor activated carbon having a controllable specific surface area according to claim 4, wherein the high-temperature water vapor is controlled in step S4Flow velocity of 3m3Reaction for 12 hours at the pressure of 4MPa and the temperature of 1200 ℃; the flow rate of the mixed gas was controlled to 3m in step S53The reaction is continued for 12 hours at the pressure of 4MPa and the temperature of 1200 ℃.
6. The method for preparing the supercapacitor activated carbon with the controllable specific surface area according to claim 1, wherein in step S6, the mass ratio of water to the coarse material in the suspension is controlled to be 9:1, the flow rate of the water is increased from 10m/S to 20m/S at a speed of 2m/S and then is decreased from 20m/S to 10m/S at a speed of 1m/S, and the steps are sequentially circulated repeatedly.
7. The method for preparing the supercapacitor activated carbon with the controllable specific surface area according to claim 1, wherein the suspension device is a cavity which is horizontally and spirally arranged in step S6, and the time from the time when the coarse material enters the suspension device to the time when the coarse material flows out of the suspension device is 10-20S.
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| CN104211061A (en) * | 2014-08-26 | 2014-12-17 | 宁夏华辉活性炭股份有限公司 | Preparation method of columnar bamboo activated carbon |
| CN104609419A (en) * | 2015-02-13 | 2015-05-13 | 洛阳月星新能源科技有限公司 | Activated carbon material and preparation method thereof and supercapacitor |
| CN106145110A (en) * | 2016-07-05 | 2016-11-23 | 中国矿业大学 | A kind of activated carbon two step process for preparing activated and the application in ultracapacitor thereof |
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