Method for processing raw material for preparing columnar granular activated carbon

Abstract

The application discloses a columnar particle activated carbon preparation raw material processing method and relates to the technical field of flue gas purification in the metallurgical industry. The method comprises the following steps: S1, coal powder preparation: selecting coking coal, semi-coke, anthracite and undersize material, feeding the coking coal, semi-coke, anthracite and undersize material into a grinding machine for grinding, and mixing the coking coal, semi-coke, anthracite and undersize material according to a ratio of 30:50:10:10; S2, water mist mixing treatment of the coal powder: adding the coal powder to a mixed barrel through a raw coal inlet, and mixing water mist and the coal powder according to a certain ratio from a cutting and mixing device through a water mist system to obtain mixed coal powder; S3, secondary mixing of the coal powder: adding a solid powder adhesive to the mixed coal powder through an adhesive feeding port in the cutting and mixing device for stirring and mixing; and S4, discharging pre-extrusion: feeding the secondary mixed coal material from the cutting and mixing device to a pre-extrusion degassing device for pre-extrusion. The method avoids uneven mixing, reduces dust dispersion and effectively avoids dust storm, and improves the yield and quality of activated carbon production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas purification technology in the metallurgical industry, in particular, to a columnar granular activated carbon preparation raw material processing method. BACKGROUND

[0002] In recent years, with the implementation of China's environmental protection policy, the activated carbon industry for flue gas purification has developed rapidly, the demand for activated carbon in China will continue to grow, the activated carbon industry is developing rapidly, and the activated carbon production equipment is also continuously improving and innovating. Especially in the field of air pollution control, the desulfurization and denitrification activated carbon (i.e. large particle activated carbon) process for treating flue gas has developed rapidly, and the purification effect is outstanding. In recent years, activated carbon desulfurization and denitrification technology has been applied to the treatment of flue gas in the steel industry, and the treatment capacity is larger. The desulfurization and denitrification activated carbon technology will become the development trend of flue gas purification treatment in the entire steel industry with its excellent purification effect and recyclable activated carbon, and will have a wider development prospect.

[0003] After the desulfurization and denitrification activated carbon technology is used in the treatment of flue gas in the steel industry, the national output cannot meet the daily consumption supply, and it is even more difficult to meet the future demand for the large-scale expansion of activated carbon desulfurization and denitrification technology. In the prior art, the mixing process of desulfurization and denitrification activated carbon raw materials usually uses a kneader. The kneading equipment is gap type production, the treatment capacity is low, and one-time treatment is 400-500 kg. The curved double-roller rotor rotates slowly in opposite directions, and the uniform distribution of various materials is completed by the overturning and kneading of the roller. Since the double-roller rotor rotates at a low speed and the roller speed is low due to the structure, the rotation speed is generally 10-20 rpm, the kneading time is as long as 8-12 minutes, and the rotation direction is single. This way of mixing materials by rotating the roller at a low speed with the materials overturning cannot well mix the various component materials uniformly. The more the materials are added at one time, the more difficult it is to overturn the materials, and the more difficult it is to disperse the materials uniformly, thereby causing the equipment to be unable to be large-scale, and seriously affecting the yield and quality of activated carbon production. Moreover, when the existing kneading equipment is working, all the coal powder raw materials need to be added into the equipment first, then the binder is added and kneaded for a period of time, then water is added and kneaded, and until the completion, the material is discharged from the discharge opening, and the next process is entered. This structure greatly limits the feeding efficiency.

[0004] In addition, the raw material processing is not uniform enough, which can cause uneven distribution of materials inside the particles produced in the subsequent granulation process, thereby causing inconsistent internal structure of the finished activated carbon after carbonization and activation, resulting in differences in mechanical properties, which is reflected in the large variation of the compression resistance of the activated carbon product. On the other hand, the uneven distribution of the binder in the coal powder can cause the coal powder with too little binder to increase the resistance during the granulation process, reduce the granulation efficiency, and easily cause the granulation die hole to be blocked, affecting normal production.

[0005] Therefore, it is necessary to provide a columnar granular activated carbon raw material processing method to solve or at least alleviate the above-mentioned defects. SUMMARY

[0006] The main purpose of the present application is to provide a columnar granular activated carbon raw material processing method, aiming to solve the technical problem that the mixing treatment is not uniform in the existing activated carbon raw material processing process by mixing coal powder, water and adhesive.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0008] A columnar granular activated carbon raw material processing method, comprising the following steps:

[0009] S1, preparation of coal powder: select coking coal, semi-coke, anthracite and undersize material, and mix them in a ratio of 30:50:10:10;

[0010] S2, water mist mixing treatment of coal powder: add coal powder to the integration mixing barrel of the cutting integration equipment through the raw coal inlet, and mix water mist and coal powder in the integration mixing barrel through the water mist system to obtain mixed coal powder;

[0011] S3, secondary mixing of coal powder: add solid powder adhesive to the integration mixing barrel through the adhesive feeding port in the cutting integration equipment to mix with the mixed coal powder;

[0012] S4, discharging pre-extrusion: discharge the secondary mixed coal from the discharge port of the cutting integration equipment to the pre-extrusion degassing equipment for pre-extrusion.

[0013] Further, in step S1, the coking coal, the semi-coke, the anthracite and the undersize material are all ground to a coal powder fineness of 200 mesh or more.

[0014] Further, the coal powder fineness is in the range of (200 mesh, 1000 mesh).

[0015] Further, in step S2, the water mist and the coal powder are in a mass fraction ratio of (10-30):100.

[0016] Further, the solid powder adhesive is an organic starch adhesive.

[0017] Further, in step S3, the solid powder adhesive and the coal powder are in a mass fraction ratio of 2-5:100.

[0018] Further, the mixing treatment of coal powder and water mist in step S2 is as follows:

[0019] S20, the pulverized coal is added from the feed hopper of the cutting and melting and mixing device to the internal melting and mixing barrel, the melting and mixing barrel rotates to transport the pulverized coal to the water mist spraying area, and the water mist is sprayed by the water spraying system;

[0020] S21, after the water mist is sprayed, the mixture of the pulverized coal and the water mist is mixed under the rotation of the melting and mixing barrel or the stirring of the melting and slurry.

[0021] Further, the solid powder binder in the step S3 and the mixed pulverized coal in the step S2 are prepared in the same cutting and melting and mixing device or in two cutting and melting and mixing devices.

[0022] Further, the stirring rate in the step 3 is 120-500 r / min, and the stirring and mixing time is 2-5 min.

[0023] Further, when the water mist and the pulverized coal are matched in the step S2, the rotation rate of the melting and mixing barrel in the cutting and melting and mixing device is 5-10 rmp.

[0024] The present application has the following beneficial effects:

[0025] By matching the pulverized coal, the solid powder binder and the water, continuously and stably adding them into the melting and mixing barrel from the raw coal inlet, the binder feeding port and the water mist system respectively, after high-speed stirring and melting of the activated carbon raw material in the melting and mixing barrel, and cooperating with the movement of the melting and mixing barrel, the activated carbon raw material in the melting and mixing barrel can be fully infiltrated and fused under the joint action of the two.

[0026] Meanwhile, the raw coal powder, the solid powder binder and the water in the present application can be added into the melting and mixing barrel at the same time, and this feeding mode can also improve the processing capacity, thereby comprehensively improving the yield and quality of the activated carbon production.

[0027] Secondly, the water and the solid powder binder are added into the melting and mixing barrel from different inlets, so that the contact reaction of the solid powder binder and the water is avoided, the caking is avoided, the problem of uneven mixing in the later stage is avoided, and the pulverized coal dust flying in the cutting and melting and mixing device can be captured, the dust dispersion is reduced, and the dust storm is effectively avoided.

[0028] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in

[0030] Figure 1 is a flow chart of the determination method in the present application;

[0031] Figure 2 is a schematic diagram of the overall structure in one embodiment of the present application

[0032] Figure 3 is a schematic diagram of the structure when the upper cover is in the open state in one embodiment of the present application;

[0033] Figure 4 is a schematic diagram of the structure when the upper cover is in the closed state in one embodiment of the present application;

[0034] Figure 5 is a partial sectional view of the overall structure in one embodiment of the present application;

[0035] Figure 6 is a top view of the overall structure in one embodiment of the present application;

[0036] Figure 7 is a schematic diagram of the structure of the barrel assembly in one embodiment of the present application;

[0037] Figure 8 is a schematic diagram of the top view of the melt-mixing barrel in one embodiment of the present application;

[0038] Figure 9 is a schematic diagram of the structure of the melt-mixing flow guide in one embodiment of the present application;

[0039] Figure 10 is a schematic diagram of the structure of the melt-mixing flow guide in one embodiment of the present application;

[0040] Figure 11 is a schematic diagram of the structure of the melt-mixing flow guide in one embodiment of the present application;

[0041] Figure 12 is a flow chart of the preparation process of the large-particle activated carbon.

[0042] BRIEF DESCRIPTION OF DRAWINGS:10, support frame; 20, barrel assembly; 210, melting mixing barrel; 211, barrel body; 212, connecting mechanism; 2121, first connecting part; 2122, second connecting part; 2123, transmission gear; 220, first driving mechanism; 221, gear transmission mechanism; 30, upper cover assembly; 310, upper cover; 311, water feeding pipeline inlet; 312, adhesive inlet; 313, raw coal inlet; 320, melting stirring part; 321, rotating shaft; 322, driven pulley; 323, stirring part; 3231, helical blade; 3232, paddle; 330, second driving mechanism; 331, driving motor; 332, driving pulley; 340, melting flow guiding part; 341, fixed connecting seat; 342, vertical section; 343, horizontal section; 40, discharging mechanism; 410, third driving mechanism; 420, first discharging barrel; 430, second discharging barrel; 440, helical blade shaft; 450, third discharging barrel; 50, support base; 510, weight sensor; 520, hinged seat. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the present application.

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0046] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0047] In recent years, with the implementation of China's environmental protection policy, the activated carbon industry for flue gas purification has developed rapidly, and the demand for activated carbon in China will continue to grow. The development momentum of the activated carbon industry is rapid, and the production equipment of activated carbon is also continuously improving and innovating. Especially in the field of air pollution control, the desulfurization and denitrification activated carbon (i.e. large particle activated carbon) process for treating flue gas has developed rapidly, and the purification effect is outstanding. In recent years, activated carbon desulfurization and denitrification technology has been applied to the treatment of flue gas in the steel industry, with larger treatment capacity. The desulfurization and denitrification activated carbon technology will become the development trend of flue gas purification in the entire steel industry due to its excellent purification effect and recyclable activated carbon, and will have a broader future.

[0048] China's activated carbon production is still far from modernization and large-scale production. In particular, the production process of coal-based desulfurization and denitrification activated carbon is not perfect, there is no unified process standard and production equipment, and the yield and quality are low. After using desulfurization and denitrification activated carbon technology in the treatment of flue gas in the steel industry, the national output cannot meet the daily consumption supply, and it is even more difficult to meet the future demand for the expansion of activated carbon desulfurization and denitrification technology. There is no industry or national standard for the production of desulfurization and denitrification activated carbon in major forming equipment, and generally other industries such as feed and biomass energy are used as reference, which is not targeted. The production equipment is not mature enough, and the production quality and yield are greatly affected by the equipment.

[0049] The preparation process of large particle activated carbon is as shown in Figure 12 The coal powder of a certain particle size is prepared by crushing and grinding the raw coal, a certain proportion of adhesive and water are added, and then the activated carbon particles of the required size are prepared by granulating equipment. At present, the raw material mixing equipment of large particle activated carbon is mainly intermittent double-roll kneading equipment.

[0050] In the original process, the mixing process of desulfurization and denitrification activated carbon raw materials is called kneading operation due to the function of the equipment. The kneading equipment is intermittent production, which can process 400-500 kg at a time. The curved double-roll rotors rotate slowly in opposite directions, and the uniform distribution of various materials is completed by the overturning and kneading of the rollers. The roller speed is generally 10-20 rmp, and the kneading time is 8-12 minutes. When the existing kneading equipment is working, all the coal powder raw materials are first added to the equipment, then the adhesive is added and kneaded for a period of time, and then the water is added and kneaded. After completion, the material is discharged by opening the discharge port, and then enters the next process. Therefore, the feeding and kneading method has poor kneading effect of each component material, and it is more difficult to disperse the material uniformly as the more material is added at a time, which leads to the difficulty of large-scale production of the equipment. Due to the limitation of the kneading equipment, the uneven distribution of the material leads to large differences in the quality of the activated carbon products. For example, the particle strength of the products produced on the same production line at the same time can differ by 2-5 times, which affects the use effect, and the preparation technology needs to be improved.

[0051] Please refer to the attached Figures 2-11The application provides a cutting and fusing device for preparing activated carbon, which comprises a support frame 10, a material cylinder assembly 20, an upper cover assembly 30 and a discharging mechanism 40, wherein the upper cover assembly 30 and the material cylinder assembly 20 are arranged above the discharging mechanism 40.

[0052] The material cylinder assembly 20 comprises a fusing and mixing barrel 210 and a first driving mechanism 220, the top of the fusing and mixing barrel 210 is open, the bottom of the fusing and mixing barrel 210 is provided with a discharging port, the fusing and mixing barrel 210 is rotatably connected to the support frame 10, and the first driving mechanism 220 is used for driving the fusing and mixing barrel 210 to rotate around the central axis thereof, wherein the size of the fusing and mixing barrel 210 can be set or replaced according to the actual processing capacity, the first driving mechanism 220 is used for driving the fusing and mixing barrel 210 to rotate around the central axis thereof, and the activated carbon raw materials located at the edge and corner positions in the fusing and mixing barrel 210 can be fused, preferably, the rotating direction of the fusing and stirring part 320 is opposite to the rotating direction of the fusing and mixing barrel 210. It is worth noting that, by setting the rotating direction of the fusing and stirring part 320 and the rotating direction of the fusing and mixing barrel 210 to be opposite, the infiltration and fusion between the activated carbon raw materials in the fusing and mixing barrel 210 can be accelerated, thereby being more beneficial to the subsequent granulation operation. Moreover, this mode can also improve the fusing of the activated carbon raw materials located at the edge and corner positions of the fusing and mixing barrel 210, and avoid the problem that the fusing effect of the activated carbon raw materials located at the edge and corner positions of the fusing and mixing barrel 210 is poor due to the centrifugal effect.

[0053] The upper cover assembly 30 comprises an upper cover 310, a fusing and stirring part 320 and a second driving mechanism 330, wherein the upper cover 310 is openably arranged at the top of the fusing and mixing barrel 210, the upper cover 310 is connected to the support frame 10, the upper cover 310 is provided with a water adding pipeline inlet 311, an adhesive inlet 312 and a raw coal inlet 313 which communicate with the inner cavity of the fusing and mixing barrel 210. It is worth noting that, by integrally arranging the water adding pipeline inlet 311, the adhesive inlet 312 and the raw coal inlet 313 on the upper cover 310, the materials can be simultaneously added into the fusing and mixing barrel 210, and this adding mode can greatly improve the adding efficiency compared with the traditional adding mode in which the materials are sequentially added, thereby improving the kneading efficiency. In addition, the upper cover 310 is openably arranged at the top of the fusing and mixing barrel 210, for example, one side of the fusing and mixing barrel 210 can be hinged to the support frame 10, further, an upper cover opening driving mechanism (not marked in the figure) can be arranged, the driving mechanism can be a driving cylinder / hydraulic cylinder, one end of the driving mechanism is fixedly connected to the support frame 10, the other end is connected to the middle part of the side of the upper cover 310, and the opening and closing of the upper cover 310 can be realized through the driving of the driving mechanism. The structural schematic diagrams of the two states can be referred to the drawings.Figure 3 and 4 .

[0054] The melting and mixing part 320 is rotatably connected to the upper cover 310 and is arranged correspondingly to the melting and mixing barrel 210, that is, the melting and mixing part 320 follows the opening and closing of the upper cover 310 and can extend into and out of the melting and mixing barrel 210, the second driving mechanism 330 is used to drive the melting and mixing part 320 to rotate around its own central axis to melt and mix the activated carbon raw material in the melting and mixing barrel 210, and the discharging mechanism 40 is used to discharge the activated carbon raw material from the discharge port of the melting and mixing barrel 210.

[0055] Workflow: The raw coal powder, the binder (thick liquid or solid powder) and the water enter the melting and mixing barrel 210 in a certain ratio and continuously and stably through the raw coal inlet 313, the binder inlet 312 and the water inlet 311 respectively, the activated carbon raw material is high-speed stirred and melted in the melting and mixing barrel 210 by the second driving mechanism 330 driving the melting and mixing part 320, and the melting and mixing barrel 210 is driven to move by the first driving mechanism 220, under the combined action of the two, the activated carbon raw material in the melting and mixing barrel 210 can be fully infiltrated and fused, the activated carbon raw material dispersed sufficiently enters the discharging mechanism 40 from the discharge port of the melting and mixing barrel 210, and is discharged in turn through the first discharging mechanism (not marked in the figure), the second discharging mechanism (not marked in the figure) and the third discharging mechanism (not marked in the figure). The whole process can be continuous, thereby improving the processing capacity, at the same time, the raw coal powder, the binder and the water of the application can be added into the melting and mixing barrel 210 at the same time, this feeding mode can also improve the processing capacity, thereby the yield and quality of the activated carbon production can be comprehensively improved.

[0056] As a preferred embodiment, the discharging mechanism 40 comprises a third driving mechanism 410 and a first discharging mechanism, a second discharging mechanism and a third discharging mechanism connected in turn, wherein,

[0057] The first discharging mechanism comprises a first discharging cylinder 420 having a first feeding port (not shown in the figure) and a first discharging port (not shown in the figure), wherein the first feeding port is communicated with the discharging port of the melting and mixing barrel 210; the second discharging mechanism comprises a second discharging cylinder 430 and a helical blade shaft 440 rotatably installed in the second discharging cylinder 430; wherein the second discharging cylinder 430 is provided with a second feeding port (not shown in the figure) and a second discharging port (not shown in the figure), wherein the second feeding port (not shown in the figure) is communicated with the first discharging port (not shown in the figure); the third discharging mechanism comprises a third discharging cylinder 450 having a third feeding port (not shown in the figure) and a third discharging port (not shown in the figure), wherein the third feeding port is communicated with the second discharging port, and the third discharging port is arranged towards the ground;

[0058] The third driving mechanism 410 is used to drive the helical conveying shaft to rotate in the second discharging cylinder 430, so as to discharge the activated carbon raw material from the discharging port of the melting and mixing barrel 210 to the outside of the third discharging port through the first discharging mechanism, the second discharging mechanism and the third discharging mechanism in sequence.

[0059] In the embodiment, the discharging mechanism 40 is arranged as the first discharging mechanism, the second discharging mechanism, the third discharging mechanism and the third driving mechanism 410, so that, during operation, the activated carbon raw material in the melting and mixing barrel 210 can be discharged through the discharging port, and then discharged through the first discharging cylinder 420, the second discharging cylinder 430 and the third discharging cylinder 450 in sequence, due to the rotating conveying effect of the helical blade shaft 440. By using the conveying mode of the helical blade shaft 440, the activated carbon raw material from the melting and mixing barrel 210 can be subjected to secondary stirring, and can be conveyed efficiently and stably.

[0060] As a preferred embodiment, the second discharging cylinder 430 is arranged obliquely below the melting and mixing barrel 210, and the second feeding port is higher than the second discharging port. It is worth noting that the second discharging cylinder 430 is arranged obliquely in the embodiment, so that the activated carbon raw material from the discharging port of the melting and mixing barrel 210 can be discharged more smoothly under the action of the helical blade shaft 440 and the oblique arrangement.

[0061] Further, the melting and mixing barrel 210 comprises a barrel body 211 and a connecting mechanism 212 arranged below the barrel body 211, wherein the connecting mechanism 212 is used to connect the barrel body 211 and the first driving mechanism 220; the top of the barrel body 211 is open, and the bottom of the barrel body 211 is formed with a discharging port communicated with the first feeding port;

[0062] The connecting mechanism 212 comprises a first connecting part 2121 and a second connecting part 2122, the first connecting part 2121 is fixedly connected with the support frame 10, the second connecting part 2122 is rotatable around the first connecting part 2121, and the bottom of the barrel body 211 is fixedly connected with the second connecting part 2122.

[0063] Further, the second connecting part 2122 comprises a slewing bearing (not shown in the figure) and a transmission gear 2123 sleeved on the outer ring of the slewing bearing, the inner ring of the slewing bearing is sleeved on the outer periphery of the first connecting part 2121, the barrel body 211 is fixedly connected with the outer ring of the slewing bearing, and the first driving mechanism 220 is connected with the transmission gear 2123 through a gear transmission mechanism 221, so as to drive the barrel body 211 to rotate around the central axis thereof. Specifically, in the embodiment, the first driving mechanism 220 drives the transmission gear 2123 sleeved on the outer ring of the slewing bearing through the gear transmission mechanism 221 (for example, a gear reduction box), the inner ring of the slewing bearing is fixedly sleeved on the outer ring of the first connecting part 2121, the outer ring of the slewing bearing is driven to rotate, and thus the barrel body 211 connected with the outer ring of the slewing bearing is driven to rotate.

[0064] As a preferred embodiment, the second driving mechanism 330 is a driving motor 331, a driving pulley 332 is installed on the output shaft of the driving motor 331; the melting and mixing stirring part 320 comprises a rotating shaft 321 and a stirring part 323 installed on the rotating shaft 321, wherein the stirring part 323 can disperse and mix the activated carbon raw materials in the melting and mixing barrel 210; the rotating shaft 321 is rotatably installed on the upper cover 310, the rotating shaft 321 is divided by the upper cover 310 into an upper rotating shaft above the upper cover 310 and a lower rotating shaft below the upper cover 310, so as to separate the transmission part and the stirring part 323, a driven pulley 322 in transmission connection with the driving pulley 332 is installed on the upper rotating shaft, and the stirring part 323 is installed on the lower rotating shaft; the driving motor 331 drives the driving pulley 332 and the driven pulley 322 to rotate, and thus drives the stirring part 323 to rotate, so as to stir the activated carbon raw materials in the melting and mixing barrel 210; the rotation speed of the rotating shaft 321 can be greatly improved by driving of the driving motor 331, so as to drive the stirring part 323 to disperse the activated carbon raw materials, and this mode can greatly improve the rotation speed and uniformly disperse the materials, compared with the mode of slow and opposite rotation of the curved double-roller rotor of the traditional kneader.

[0065] Please refer to the accompanying drawings Figures 7-11, as a preferred embodiment, the upper cover assembly 30 further comprises a melting and mixing guide part 340 arranged on one side of the stirring part 323, the melting and mixing guide part 340 comprises a fixed connecting seat 341, a vertical section 342 and a horizontal section 343; wherein the fixed connecting seat 341 is fixed (for example by bolt connection) to the bottom of the upper cover 310, the vertical section 342 is fixedly connected with the bottom of the fixed connecting seat 341 and extends downward, the vertical section 342 and the inner wall of the melting and mixing barrel 210 have a gap, the horizontal section 343 is connected to the lower end of the vertical section 342, the horizontal section 343 and the bottom plate of the melting and mixing barrel 210 have a gap, the horizontal section 343 extends from the vertical section 342 in a direction away from the inner wall of the melting and mixing barrel 210, so as to clean the material adhered to the inner wall of the melting and mixing barrel 210 and guide the material located at the edge of the melting and mixing barrel 210 to the discharge port of the melting and mixing barrel 210.

[0066] Preferably, please refer to the attached drawings in detail Figure 7 When the second discharge cylinder 430 and the melting and mixing barrel 210 are arranged obliquely, the melting and mixing guide part 340 is preferably arranged at the low side of the inclination, the installation angle θ of the vertical section 342 to the fixed connecting seat 341 ranges from 0 to 90 degrees, the lower the angle, the better the melting effect, but the resistance will increase, and the material flow property can be configured to a better angle. The horizontal section 343 is arranged offset to the stirring part 323, and the angle β ranges from 0 to 60 degrees, the smaller the angle, the stronger the material guiding ability, but the resistance will increase, and the optimal angle is 30-40 degrees. The horizontal section 343 is designed in an arc shape, and the arc radius r can be set to be greater than the inner barrel radius R of the melting and mixing barrel 210, R < r < 1.5R.

[0067] The melt-integrated guide part 340 in the embodiment is mainly used for cleaning the material adhered to the wall of the melt-integrated mixing barrel 210 and guiding the material inside and outside the melt-integrated mixing barrel 210. Since the melt-integrated mixing barrel 210 rotates under the driving of centrifugal force, the material moves outward. It can be understood that the at least stirring part 323 cannot act on the material, which reduces the melt-integrated effect. In addition, the inclined arrangement easily causes the material to accumulate on one side of the inclination, and the material discharge is not controlled. The bottom layer of the melt-integrated material is introduced into the discharge port of the melt-integrated mixing barrel 210 through the horizontal section 343. It should be noted that the horizontal section 343 cannot be too close to the stirring part 323 or too far away from the stirring part 323. If it is too close, the material is easily accumulated between the stirring part 323 and the horizontal section 343, which causes large fluctuations in operating power and affects normal operation. If it is too far away, the material guiding effect is weakened. In addition, the horizontal section 343 is preferably not rigidly arranged, which easily blocks the material flow, increases the resistance of the horizontal section 343, and even causes the horizontal section 343 to fail and be damaged. Therefore, preferably, the horizontal section 343 has a certain radian and angle. It is found in research that the better the material flowability, the smaller the angles θ and β. Conversely, the angles θ and β can be larger. In this way, the melt-integrated guide part 340 has good melt-integrated effect, reduces the operating resistance, and ensures stable operation of each component.

[0068] Further, the horizontal section 343 can be arranged in a blade shape in the cutting direction to improve the scraping effect.

[0069] In the embodiment, the melt-integrated guide part 340 is arranged, and under the combined action of the melt-integrated guide part 340 and the stirring part 323, the activated carbon raw material in the melt-integrated mixing barrel 210 can be fully cut, melt-integrated and mixed, which accelerates the infiltration and fusion of the raw coal powder, the binder and the water, thereby being more conducive to the subsequent granulation process operation and producing high-quality activated carbon.

[0070] As another preferred embodiment, a support base 50 and a load cell 510 are further included below the support frame 10, wherein the support base 50 can provide basic support and can be fixed on the equipment platform foundation through anchor bolts or cement pouring, and the load cell 510 can monitor the change of pressure and can directly or indirectly reflect the weight of the material in the melt-mixing barrel 210, so as to control the filling rate. The load cell 510 is a sensor device well known in the art, such as a ZY-20t column pressure type load cell. The top of the support base 50 is connected with a hinged seat 520 on one side near the high end of the second discharge cylinder 430, and it is worth noting that the hinged seat 520 can rotate around the hinged seat 520 when the melt-mixing barrel 210 is filled with material to a certain weight, so that the force acting on the load cell 510 by the support frame 10 becomes larger, so as to control the material filling rate of the melt-mixing barrel 210 according to this. The bottom of the support frame 10 is hinged to the support base 50 through the hinged seat 520, and the top of the support base 50 is provided with the load cell 510 on one side near the low end of the second discharge cylinder 430. In order to match the larger force acting on the load cell 510 after the melt-mixing barrel 210 is filled with material, the hinged seat 520 in this embodiment is arranged below the high end of the second discharge cylinder 430, and the load cell 510 is arranged on one side near the low end of the second discharge cylinder 430. The load cell 510 includes oppositely arranged monitoring ends (not shown in the figure) and fixed ends (not shown in the figure), the monitoring ends are in contact with the bottom of the support frame 10, and the fixed ends are fixedly connected with the support base 50.

[0071] In other words, in a preferred embodiment, by arranging the second discharge cylinder 430 obliquely below the melt-mixing barrel 210, and the second inlet is higher than the second outlet, and the melt-mixing barrel 210 is also arranged obliquely, both the good flowability of the activated carbon raw material and the double effect of the hinged connection of the bottom of the support frame 10 to the support base 50 through the hinged seat 520 can be achieved, so as to control the material filling rate of the melt-mixing barrel 210 according to this.

[0072] Further, the stirring part 323 comprises helical blades 3231 fixedly sleeved on the outer surface of the lower rotating shaft and a plurality of spaced paddle blades 3232 provided on the lower rotating shaft, wherein the paddle blades 3232 and the helical blades 3231 are staggered, and the cutting direction of the paddle blades 3232 is consistent with the conveying direction of the helical blades 3231. It is worth noting that, under the driving of the second driving mechanism 330, the helical blades 3231 and the paddle blades 3232 rotate at high speed, and under the cutting of the paddle blades 3232 and the conveying of the helical blades 3231, the active carbon raw materials can be fully mixed and stirred. By setting the cutting direction of the paddle blades 3232 consistent with the conveying direction of the helical blades 3231, that is, the active carbon raw materials cut by the paddle blades 3232 can be conveyed along the helical blades 3231, so as to cut the active carbon raw materials in other parts.

[0073] Based on the above raw material mixing and grinding equipment, please refer to Figure 1 The present application provides a columnar particle active carbon preparation raw material processing method, comprising the following steps:

[0074] S1, preparation of coal powder: select coking coal, semi coke, anthracite, and screen underfeed into a grinding machine for grinding, and the coking coal, semi coke, anthracite and screen underfeed are mixed in a ratio of 30:50:10:10; to ensure that the product has low ash content, high strength, and developed voids and other performance indicators; in addition, for those skilled in the art, the screen underfeed is a collection of unqualified particle size of coal powder particles in the active carbon production process by screening, for example: the particle size of coal powder particles is required to be 200 mesh, at this time, the screen underfeed is coal powder particles with a particle size less than 200 mesh, and the screen underfeed is a mixture of coking coal, semi coke and anthracite;

[0075] S2, water mist mixing treatment of coal powder: adding coal powder to the mixing and grinding barrel of the cutting and mixing equipment through the raw coal inlet, and mixing water mist and coal powder in the mixing and grinding barrel through the water mist system to obtain mixed coal powder;

[0076] S3, secondary mixing of coal powder: adding solid powder adhesive to the mixing and grinding barrel through the adhesive feeding port in the cutting and mixing equipment to mix with the mixed coal powder;

[0077] S4, discharging pre-extrusion: the coal material after secondary mixing is transported from the discharge port of the cutting and mixing equipment to the pre-extrusion degassing equipment for pre-extrusion.

[0078] The material after the integration is extruded and exhausted, the compactness of the processed material is improved, the preparation raw material of the activated carbon is processed by cutting integration coupled pre-extrusion, the raw material processing time is reduced, the material mixing uniformity is improved, and the granulation effect is improved, and finally the production line capacity is increased and the product quality stability is ensured.

[0079] Secondly, the preparation steps of the undersize material are as follows: the coking coal, the semi-coke and the anthracite are ground and mixed according to the mass fraction ratio of 30-35:50-55:10-20, after mixing, the particle size is screened by screening equipment, and the mixed powder below the screening particle size is collected; for subsequent activated carbon preparation, to enhance the quality of the production products.

[0080] Compared with the traditional processing process, the raw material processing method in the application has the following advantages: first, the water mist and the mixed coal powder are premixed, which has the advantages that the water mist itself can capture the flying coal dust in the cutting integration equipment while wetting the mixed coal powder, reduce dust dispersion and effectively avoid dust storm;

[0081] Secondly, the water in the coal powder is diffused and infiltrated in the coal powder by the hydrophobicity of the coal powder and the movement of the cutting integration equipment, and at the same time, when the solid powder binder is added later, the solid powder binder will be quickly absorbed into a group by contacting with water first, which will seriously affect the uniform fusion of each component material, resulting in the following problems in the subsequent granulation process:

[0082] (1) uneven distribution of internal materials, resulting in inconsistent internal structure of the finished activated carbon after carbonization and activation, causing differences in mechanical properties, mainly reflected in the large variation of the compression resistance of the activated carbon product.

[0083] (2) due to uneven distribution, the resistance of the material discharged from the granulation die hole during the granulation process is increased, the granulation efficiency is reduced, and the granulation die hole is easily blocked.

[0084] It is worth noting that in the actual application scenario, the bulk density of the activated carbon preparation raw material in the current preparation process is 0.43g / cm 3 After the raw material processing method in the application is adopted, the raw material is exhausted by the pre-extrusion degassing equipment, the speed of the screw shaft in the pre-extrusion degassing equipment is adjusted, the processing capacity of the equipment can be adjusted, and the smoothness and stability of the material flow are considered, the speed range is generally 15-60rmp, preferably 20-40rmp, and best 25-30rmp.

[0085] Secondly, by changing the pre-extrusion conical outlet angle 70-85°, it is understood that the pre-extrusion conical outlet here specifically refers to the use of a conical cylinder in the cylinder of the pre-extrusion degassing device, that is, according to the transmission direction of the raw material inside the pre-extrusion degassing device, the inner wall of the cylinder of the pre-extrusion degassing device is a conical surface, and the taper of the conical surface is set to be between 70-85°. Therefore, by setting the taper of the inner wall of the cylinder, different extrusion effects can be obtained, and the preferred pre-extrusion bulk density is 0.72-0.8 g / cm 3 )The raw material bulk density changes as follows:

[0086] Conical exit angle (°) Raw material bulk density (g / cm 3 )]]> 80 < K < 85 0.8 75 < K < 80 0.75 70 < K < 75 0.72

[0087] Further, in order to improve the quality of the finished product of the activated carbon in the subsequent granulation process and maintain excellent performance, in the step S1, the coking coal, the semi-coke, the anthracite and the undersize material are all ground to a coal powder fineness of ≥200 mesh. It is understood that the finer the fineness, the higher the quality of the activated carbon prepared subsequently, but considering the limitations of current production equipment, 200 mesh < the coal powder fineness < 1000 mesh, effectively controlling the input required for actual production, and improving the economic benefits of the product.

[0088] It can be understood that in order to avoid too much water content, which causes the material to be too wet during the subsequent mixing process, affecting the subsequent granulation forming, therefore, in step S2, the water mist and the coal powder are mixed in a ratio of 10-30:100. For those skilled in the art, the water mist system is used to mix the added water with the coal powder in the form of water mist, on the one hand, to avoid the water directly impacting the coal powder when adding water, causing the coal powder to escape inside the equipment, on the other hand, the water mist form combined with the hydrophobicity of the coal powder itself can better soak the coal powder, making it easier for the solid adhesive to integrate with the coal powder more effectively.

[0089] Further, the solid powder adhesive uses an organic starch-based adhesive.

[0090] At the same time, in step S3, as a preferred, the ratio of the solid powder adhesive and the coal powder is 2-5:100, to avoid using too high a proportion to cause poor uniformity of the material mixing.

[0091] Further, in order to better promote the mixing of the coal powder and the solid powder adhesive, the specific steps of the coal powder and water mist mixing process in step S2 are as follows:

[0092] S20, the coal powder is added from the feed hopper of the cutting integration equipment to the integration mixing barrel inside, the integration mixing barrel rotates to transport the coal powder to the water mist spraying area, and the water mist spraying process is performed by the water spraying system;

[0093] S21. After spraying water mist, the mixture of coal powder and water mist is mixed by the rotation of the melting and mixing tank or by the stirring action of the melting slurry.

[0094] It is understood that the addition of the solid powder binder in step S3 and the acquisition of the mixed coal powder in step S2 are carried out in the same cutting and melting equipment or in two separate cutting and melting equipment.

[0095] In addition, the stirring rate in step 3 is 120-500 r / min, and the stirring and mixing time is 2-5 min.

[0096] In step S2, when water mist and coal powder are mixed in a ratio of 10-30:100, the self-rotation speed of the melting and mixing tank in the cutting and melting equipment is 5-10 rpm.

[0097] To further understand the raw material processing in this invention, several samples (materials after cutting and melting) were obtained using existing processes and the raw material processing method of this invention. These samples were taken from different locations and at different times, and then dried. The moisture content CV value was calculated based on the moisture content of each sample and the average moisture content. The measured data are shown in the table below:

[0098] Coal fines Water Solid binder Moisture content CV value Example 1 100 10 2 3.18 Example 2 100 20 3.5 4.45 Example 3 100 30 5 6.76 Control Example 1 100 10 2 18.15 Control Example 2 100 20 3.5 17.09 Control Example 3 100 30 5 19.46

[0099] As can be seen from the data in the table, the water content CV value of the raw material prepared by the present invention is significantly lower than that of the sample prepared by the existing process, which indirectly proves that the preparation method of the present invention achieves stronger uniformity in raw material processing.

[0100] Furthermore, to more directly understand the impact of the raw material processing technology in this invention on the subsequent preparation of activated carbon, compressive strength and tensile strength were tested, and the data are shown in the table below:

[0101]

[0102]

[0103] According to the data in the table, the compressive strength of the product treated by this invention is increased by about 10%, and the uniformity of compressive strength is also improved to a certain extent.

[0104] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0105] The preferred embodiments of the present application have been described above with the intent to enable those skilled in the art to make and use it. Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the true scope of the present application is not limited to the embodiments described herein but is only limited to the scope of the claims together with the full range of equivalents to which such claims are entitled.

Claims

1. A method for processing raw materials for preparing columnar granular activated carbon, characterized in that, It comprises the following steps: S1, preparation of coal powder: select coking coal, coke, anthracite, undersize material into the mill for grinding, and coking coal, coke, anthracite, undersize material according to the ratio of 30:50:10:10 for mixing; S2, water mist mixing treatment of coal powder: add coal powder to the integration mixing barrel of the cutting integration equipment through the raw coal inlet, and mix water mist and coal powder in the integration mixing barrel through the water mist system to obtain mixed coal powder; the undersize material is coal powder particles with a particle size less than 200 mesh, and the undersize material is a mixture of coking coal, coke and anthracite; S3, secondary mixing of mixed coal powder: add solid powder adhesive to the integration mixing barrel through the adhesive feeding port in the cutting integration equipment to mix with the mixed coal powder; S4, pre-extrusion of discharge: the coal material after secondary mixing is transported from the discharge port of the cutting integration equipment to the pre-extrusion degassing equipment for pre-extrusion; The cutting integration equipment comprises a support frame, a barrel assembly, an upper cover assembly and a discharge mechanism, the upper cover assembly and the barrel assembly are arranged above the discharge mechanism, the barrel assembly comprises an integration mixing barrel and a first driving mechanism, the top of the integration mixing barrel is open, a discharge port is formed in the bottom of the integration mixing barrel, the integration mixing barrel is rotatably connected to the support frame, and the first driving mechanism is used to drive the integration mixing barrel to rotate around its own central axis, the upper cover assembly comprises an upper cover and an integration stirring part, the integration stirring part is rotatably connected to the upper cover and is correspondingly arranged with the integration mixing barrel, the integration stirring part comprises a rotating shaft and a stirring part mounted on the rotating shaft, the upper cover assembly further comprises an integration flow guide part arranged on one side of the stirring part, the integration flow guide part comprises a fixed connecting seat, a vertical section and a horizontal section; wherein the fixed connecting seat is fixed to the bottom of the upper cover, the vertical section is fixedly connected with the bottom of the fixed connecting seat and extends downward, the vertical section and the inner wall of the integration mixing barrel have a gap, the horizontal section is connected to the lower end of the vertical section, the horizontal section and the bottom plate of the integration mixing barrel have a gap, and the horizontal section extends away from the inner wall of the integration mixing barrel in a direction to clean the material adhered to the inner wall of the integration mixing barrel and guide the material located at the edge of the integration mixing barrel to the discharge port of the integration mixing barrel.

2. The method of claim 1, wherein the columnar granular activated carbon raw material is prepared by a method comprising: In step S1, the coking coal, the coke, the anthracite and the undersize material are all ground to a coal powder fineness of ≥200 mesh. ​ 3. The method of claim 2, wherein the columnar granular activated carbon raw material is prepared by a method comprising: The coal powder fineness ranges from 200 to 1000 mesh. ​ 4. The method of claim 1, wherein the columnar granular activated carbon raw material is prepared by a method comprising: In step S2, the water mist and the coal powder are mixed in a mass fraction ratio of (10-30):

100. ​ 5. The method of claim 1, wherein the columnar granular activated carbon raw material is prepared by a method comprising: mixing a carbon source and a binder to prepare a mixture; and extruding the mixture to prepare a columnar granular activated carbon raw material. The solid powder adhesive is an organic starch-based adhesive.

6. The columnar particle activated carbon raw material treatment method according to any one of claims 1 to 5, characterized by, In step S3, the solid powder adhesive and the coal powder are mixed in a mass fraction ratio of 2-5:

100.

7. The method of claim 6, wherein the columnar granular activated carbon raw material is prepared by a method comprising: The mixing process of the coal powder and the water mist in step S2 is as follows: ​ S20, adding the pulverized coal from the feed hopper of the cutting and melting equipment to the internal melting mixing barrel, the melting mixing barrel rotates to transport the pulverized coal to the water mist spraying area, and the water mist spraying system sprays water mist; S21, after spraying the water mist, the mixture of the pulverized coal and the water mist is mixed under the rotation of the melting mixing barrel or the stirring of the melting slurry.

8. The method of claim 7, wherein the columnar granular activated carbon raw material is prepared by a method comprising: The solid powder binder in the step S3 and the mixed pulverized coal in the step S2 are prepared in the same cutting and melting equipment or in two separate cutting and melting equipment. ​ 9. The method of claim 1, wherein the columnar granular activated carbon raw material is prepared by a method comprising: The stirring speed in the step S3 is 120-500 r / min, and the stirring time is 2-5 min. ​ 10. The method of claim 9, wherein the columnar granular activated carbon raw material is prepared by a method comprising: When the water mist and the pulverized coal are mixed in the step S2, the rotation speed of the melting mixing barrel in the cutting and melting equipment is 5-10 rmp. ​

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