Carbon black granulation system for improving granulation effect

Abstract

The application relates to a carbon black granulation system capable of improving granulation effect, which comprises a powder carbon storage tank, a discharging pump, a screw conveyor, a granulator and a granulation water input pipeline; the granulator comprises a shell, an inner shaft and a twisted tooth, the shell is provided with a feeding port, a front row of granulation water inlets, a rear row of granulation water inlets and a discharging port, the rear row of granulation water inlets is arranged behind the front row of granulation water inlets; the twisted tooth is arranged in a spiral shape on the surface of the inner shaft; the granulation water input pipeline comprises a first process water pipeline, a second process water pipeline and an adhesive pipeline, the first process water pipeline is connected with the front row of granulation water inlets, the second process water pipeline and the adhesive pipeline are connected with a static mixer and then connected with the rear row of granulation water inlets. The application can improve the condition of carbon black granulation particles, make the prepared carbon black particles have a hard soft shell, improve the dispersibility of the carbon black particles, simultaneously reduce the usage amount of the adhesive, and save the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon black granulation, and particularly relates to a carbon black granulation system for improving granulation effect. BACKGROUND

[0002] The carbon black granulation process is as follows: the powdery carbon black is stored in a powder carbon storage tank, the powder carbon black is controlled by a discharging pump, and the powder carbon black is conveyed to a granulator by a screw conveyor for granulation operation. The powdery carbon black enters the granulator through a conveying pipeline, process water and a certain proportion of binder form granulation water after passing through a static mixer. The granulation water forms a certain angle through a granulation water nozzle, and enters the granulator through a granulation water inlet on the granulator. The powdery carbon black forms uniform granular carbon black after the processes of degassing, wetting, granulation, compaction and polishing in the granulator, and enters a drying drum through a discharge port on the granulator for drying.

[0003] At present, domestic enterprises all adopt the above method, and use the carbon black granulation system as shown in Figure 1 for granulation. The produced carbon black particles are hard or the whole soft carbon black fine powder content is high, which are not conducive to the dispersion of the carbon black. Compared with the international advanced carbon black production enterprises, such as the carbon black particles produced by Cabot, which are hard on the outside and soft on the inside, the main reason is that Figure 1 the distance between the granulation water inlet and the carbon black feeding port is too close in the domestic granulation system, the granulation water containing the binder participates in the whole process of granulation, which leads to the hard carbon black particles, and is not conducive to the dispersion. SUMMARY

[0004] The purpose of the present application is to provide a carbon black granulation system for improving granulation effect, to improve the condition of the carbon black granulation particles, to make the produced carbon black particles hard on the outside and soft on the inside, to improve the dispersibility of the carbon black particles, and to reduce the use amount of the binder and save the cost.

[0005] The technical scheme adopted by the present application is: a carbon black granulation system for improving granulation effect, comprising a powder carbon storage tank, a discharging pump, a screw conveyor, a granulator and a granulation water input pipeline; the powder carbon storage tank, the discharging pump and the screw conveyor are sequentially arranged from top to bottom, the carbon black powder sequentially passes through the powder carbon storage tank, the discharging pump and the screw conveyor, and enters the feeding port of the granulator shell from the screw conveyor; the granulator comprises a shell, an inner shaft and a twisted tooth, the shell is provided with a feeding port, a front row granulation water inlet, a rear row granulation water inlet and a discharge port, and the rear row granulation water inlet is arranged behind the front row granulation water inlet; the inner shaft is arranged in the shell and penetrates through the shell, and the twisted tooth is arranged in a spiral shape on the surface of the inner shaft; the granulation water input pipeline comprises a first process water pipeline, a second process water pipeline and a binder pipeline, the first process water pipeline is connected with the front row granulation water inlet, the second process water pipeline and the binder pipeline are connected with a static mixer, and the static mixer is connected with the rear row granulation water inlet.

[0006] Further, the distance between the tines located between the front row of granulation water inlets and the rear row of granulation water inlets is greater than the distance between the tines at the front end of the front row of granulation water inlets and the rear end of the rear row of granulation water inlets.

[0007] Further, the gap between the tines and the inner wall of the shell located between the front row of granulation water inlets and the rear row of granulation water inlets is greater than the gap between the tines and the inner wall of the shell at the front end of the front row of granulation water inlets and the rear end of the rear row of granulation water inlets.

[0008] Further, the front row of granulation water inlets and the rear row of granulation water inlets are evenly arranged in a circumferential manner around the surface of the shell.

[0009] Further, the front row of granulation water inlets is 100-150 mm away from the feed inlet, and the rear row of granulation water inlets is 500-800 mm away from the feed inlet.

[0010] Further, the distance between the tines located between the front row of granulation water inlets and the rear row of granulation water inlets is 1.5-2 times the distance between the tines at the front end of the front row of granulation water inlets and the rear end of the rear row of granulation water inlets.

[0011] Further, the gap between the tines and the inner wall of the shell located between the front row of granulation water inlets and the rear row of granulation water inlets is 6-10 mm, and the gap between the tines and the inner wall of the shell at the front end of the front row of granulation water inlets and the rear end of the rear row of granulation water inlets is 3-6 mm; the difference between the gap between the tines and the inner wall of the shell located between the front row of granulation water inlets and the rear row of granulation water inlets and the gap between the tines and the inner wall of the shell at the front end of the front row of granulation water inlets and the rear end of the rear row of granulation water inlets is not less than 2 mm.

[0012] Further, flow meter valve groups are arranged on the first process water pipeline, the second process water pipeline, and the binder pipeline.

[0013] The beneficial technical effects of the present application are:

[0014] (1) A row of granulation water inlets is additionally arranged on the granulator shell, the front row of granulation water inlets is used for spraying process water, and the rear row of granulation water inlets is used for spraying granulation water containing a binder, thereby increasing the distance between the granulation water and the feed inlet; only process water is added for wet granulation during the degassing, wetting, and granulation stages, the binding force of the process water is lower than that of the granulation water containing the binder, so that the carbon black particles are relatively soft as a whole; the granulation water containing the binder is added during the compaction and polishing stages, the binding force on the surface of the carbon black is enhanced, and a hard shell is formed after compaction and polishing, thereby obtaining carbon black particles with a soft inner shell and a hard outer shell, and improving the dispersibility of the carbon black particles;

[0015] (2) By setting different tooth spacing and different tooth distance gap from the inner wall of the shell at different positions of the inner shaft, the granulator can consider the granulation quality and the granulation efficiency, the smaller the tooth spacing, the more sufficient the stirring, the smaller the tooth distance gap from the inner wall of the shell, the better the particle uniformity of the carbon black particles, and the smoother the surface, but the lower the granulation efficiency, the larger the tooth distance gap from the inner wall of the shell, the higher the granulation efficiency, but the lower the particle uniformity and surface smoothness of the carbon black particles; the smaller tooth spacing and tooth distance gap from the inner wall of the shell are arranged at the front section of the inner shaft, so that the carbon black powder is quickly degassed and uniformly mixed with process water, the tooth spacing and tooth distance gap from the inner wall of the shell are increased in the middle section, so that the carbon black powder is quickly granulated, and the tooth spacing and tooth distance gap from the inner wall of the shell are reduced again in the rear section, so that the carbon black particles are tightly compacted and polished, and the carbon black quality is improved; at the same time, the amount of binder used is also reduced in the carbon black production process, thereby effectively saving costs. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0017] Figure 1 It is a structural schematic diagram of the existing carbon black granulation system.

[0018] Figure 2 It is a structural schematic diagram of the embodiment of the present application.

[0019] Explanation of reference signs: 1-powder carbon storage tank, 2-feeding pump, 3-screw conveyor, 4-shell, 5-inner shaft, 6-tooth, 7-feeding port, 8- front row of granulation water inlet, 9-rear row of granulation water inlet, 10-discharge port, 11-first process water pipeline, 12-second process water pipeline, 13-binder pipeline, 14-static mixer, 15-flow meter valve group. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. In the following description, a large number of specific details are set forth in order to fully understand the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed below.

[0021] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art described herein. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, which change accordingly when the absolute position of the described object changes.

[0022] like Figure 2 As shown, a carbon black granulation system for improving granulation effect includes a carbon powder storage tank 1, a feeding pump 2, a screw conveyor 3, a granulator, and a granulation water inlet pipeline. The carbon powder storage tank 1, the feeding pump 2, and the screw conveyor 3 are arranged sequentially from top to bottom. Carbon black powder passes through the carbon powder storage tank 1, the feeding pump 2, and the screw conveyor 3 in sequence, and enters the feed inlet 7 of the granulator housing 4 from the screw conveyor 3. The granulator includes a housing 4, an inner shaft 5, and a riveting gear 6. The housing 4 is provided with a feed inlet 7, a front granulation water inlet 8, a rear granulation water inlet 9, and a discharge outlet 10. The front granulation water inlet 8 is used to spray in process water, and the rear granulation water inlet 9 is used to spray in granulation water containing binder. Preferably, the distance between the front granulation water inlet 8 and the feed inlet 7 is 100-150 mm, and the distance between the rear granulation water inlet 9 and the feed inlet 7 is 500-800 mm; in this embodiment of the invention, the distance between the front granulation water inlet 8 and the feed inlet 7 is 120 mm, and the distance between the rear granulation water inlet 9 and the feed inlet 7 is 700 mm.

[0023] This invention, through the addition of a front granulation water inlet 8 to the granulator housing 4 and the rear granulation water inlet 9 being moved rearward, increases the distance between the rear granulation water inlet 9 and the feed inlet 7. During the degassing, wetting, and granulation stages, only process water is added for wet granulation. The adhesive force of the process water is lower than that of granulation water containing binder, resulting in relatively soft carbon black particles. During the compaction and polishing stages, granulation water containing binder is added to enhance the adhesion of the carbon black surface. After compaction and polishing, a hard outer shell is formed, thus producing carbon black particles with a soft inner shell and a hard outer shell. Simultaneously, the amount of binder used in the carbon black production process is reduced, effectively saving costs.

[0024] The inner shaft 5 is arranged in the shell 4 and penetrates the shell 4, one end of the inner shaft 5 is connected with the driving motor, the inner shaft 5 is driven to rotate by the driving motor, and the twisted tooth 6 is driven to stir the carbon black to be granulated. The twisted tooth 6 is arranged in a spiral shape on the surface of the inner shaft 5, and the twisted tooth 6 has a gap with the inner wall of the shell 4, the carbon black moves towards the inner wall of the shell 4 under the action of the centrifugal force, and is compacted and polished on the inner wall of the shell 4 through the twisted tooth 6, so as to be shaped into carbon black particles.

[0025] The granulation water input pipeline comprises a first process water pipeline 11, a second process water pipeline 12 and an adhesive pipeline 13, the first process water pipeline 11 and the second process water pipeline 12 are both used for circulating process water, and the adhesive pipeline 13 is used for circulating adhesive. The first process water pipeline 11 is connected with the front row of granulation water inlets 8, the second process water pipeline 12 and the adhesive pipeline 13 are connected with the static mixer 14, the static mixer 14 is connected with the rear row of granulation water inlets 9, process water and adhesive are fully mixed in the static mixer 14 to form granulation water, and the granulation water enters the granulator through the rear row of granulation water inlets 9 to participate in carbon black granulation. The first process water pipeline 11, the second process water pipeline 12 and the adhesive pipeline 13 are all provided with flow meter valve groups 15 for controlling the opening and closing of the pipelines.

[0026] The working principle of the embodiment of the application is as follows:

[0027] The powdery carbon black in the powder carbon storage tank 1 is uniformly fed into the screw conveyor 3 through the discharging pump 2, is stirred by the spiral blades of the screw conveyor 3, enters the granulator, and is further stirred by the twisted tooth 6, and the powdery carbon black is discharged from the gas adsorbed on the surface of the carbon black under the high-speed stirring action of the spiral blades and the twisted tooth 6, so that the exhaust step of carbon black granulation is completed.

[0028] One way of process water is sprayed into the granulator through the front row of granulation water inlets 8 at a certain angle, and the process water without adhesive is mixed with the powdery carbon black after degassing treatment, and the powdery carbon black is fully contacted with the process water under the action of the twisted tooth 6, so that the surface of the carbon black is rapidly wetted, and the wetting step of carbon black granulation is completed.

[0029] After wetting, the adsorption force of the carbon black is enhanced, the carbon black is extruded and adhered together under the stirring action of the twisted tooth 6, gradually forms carbon black particles, and the granulation step of carbon black granulation is completed, and since no adhesive is added in the process water, the formed carbon black particles are relatively soft as a whole.

[0030] The other process water and binder are input into the static mixer 14 to form granulation water, which is sprayed into the granulator at a certain angle through the rear granulation water inlet 9. The granulation water containing the binder has stronger adhesion than the process water, and the granulation water containing the binder is adsorbed on the surface of the carbon black particles and further extrudes the carbon black particles through the stirring action of the twisted teeth 6, so that the carbon black particles are extruded with each other or the inner wall of the shell 4, the carbon black particles are compacted to form a relatively hard carbon black particle shell, and the surface of the carbon black particles is polished through the friction between the twisted teeth 6 and the inner wall of the shell 4, so that the compaction and polishing steps of the carbon black granulation are completed, and the carbon black particles with uniform quality, smooth surface, soft inside and hard outside are formed.

[0031] In order to uniformly mix the process water and the granulation water containing the binder with the carbon black, the front granulation water inlets 8 and the rear granulation water inlets 9 are circumferentially arranged around the surface of the shell 4 in the embodiment of the present application. All the front granulation water inlets 8 are uniformly distributed on the same section, and all the rear granulation water inlets 9 are uniformly distributed on another section. The process water and the granulation water containing the binder are sprayed into the granulator from the front granulation water inlets 8 and the rear granulation water inlets 9, respectively, and are quickly and uniformly mixed with the carbon black under the high-speed stirring of the twisted teeth 6, so that the carbon black particles are kept uniform, the utilization rate of the carbon black powder is improved, the residual powder is reduced, and large-diameter carbon black particles are avoided, thereby improving the granulation quality.

[0032] On the other hand, the embodiment of the present application can balance the granulation quality and the granulation efficiency by setting different twisted tooth intervals and different gaps between the twisted teeth and the inner wall of the shell at different positions of the inner shaft 5. The twisted tooth interval l1 between the front granulation water inlets 8 and the rear granulation water inlets 9 is greater than the twisted tooth interval l2 of the front end of the front granulation water inlets 8 and the rear end of the rear granulation water inlets 9. Preferably, the twisted tooth interval l1 between the front granulation water inlets 8 and the rear granulation water inlets 9 is 1.5-2 times the twisted tooth interval l2 of the front end of the front granulation water inlets 8 and the rear end of the rear granulation water inlets 9. In the embodiment of the present application, l1=1.8l2. The gap d1 between the twisted teeth and the inner wall of the shell between the front granulation water inlets 8 and the rear granulation water inlets 9 is greater than the gap d2 between the twisted teeth and the inner wall of the shell at the front end of the front granulation water inlets 8 and the rear end of the rear granulation water inlets 9. Preferably, the gap d1 between the twisted teeth and the inner wall of the shell between the front granulation water inlets 8 and the rear granulation water inlets 9 is 6-10 mm, and the gap d2 between the twisted teeth and the inner wall of the shell at the front end of the front granulation water inlets 8 and the rear end of the rear granulation water inlets 9 is 3-6 mm. In the embodiment of the present application, d1=8 mm and d2=4 mm. It should be noted that the values of d1 and d2 should satisfy the relationship d1-d2≥2 mm, so that the granulator can realize high-efficiency granulation while achieving high-quality granulation.

[0033] Generally speaking, the smaller the distance between the teeth 6, the more fully the stirring; the smaller the gap between the teeth and the inner wall of the shell, the better the particle uniformity of the carbon black particles, and the smoother the surface, but the lower the granulation efficiency; the larger the gap between the teeth and the inner wall of the shell, the higher the granulation efficiency, but the lower the particle uniformity and surface smoothness of the carbon black particles. The embodiment of the present application sets a smaller distance between the teeth and a smaller gap between the teeth and the inner wall of the shell in the front section of the inner shaft 5, so that the carbon black powder is quickly degassed and uniformly mixed with process water; the distance between the teeth and the gap between the teeth and the inner wall of the shell are increased in the middle section, so that the carbon black powder is quickly granulated; the distance between the teeth and the gap between the teeth and the inner wall of the shell are again reduced in the rear section, so that the carbon black particles are tightly compacted and polished, and the quality of the carbon black is improved.

[0034] Table 1 is a comparison table of the indexes of the carbon black particles prepared by the embodiment of the present application and the carbon black particles prepared by the existing carbon black granulation system. As can be seen from Table 1, the carbon black particles prepared by the embodiment of the present application have improved in various indexes.

[0035] Table 1 Comparison of indexes of carbon black particles prepared by the embodiment of the present application and carbon black particles prepared by the existing carbon black granulation system

[0036]

[0037] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A carbon black granulating system for improving a granulating effect, characterized by, The granulator comprises a shell, an inner shaft and a twisted tooth, the shell is provided with a feeding port, a front row of granulation water inlet, a rear row of granulation water inlet and a discharging port, the rear row of granulation water inlet is arranged behind the front row of granulation water inlet, the inner shaft is arranged in the shell and penetrates the shell, the twisted tooth is arranged in a spiral shape on the surface of the inner shaft, the granulation water input pipeline comprises a first process water pipeline, a second process water pipeline and an adhesive pipeline, the first process water pipeline is connected with the front row of granulation water inlet, the second process water pipeline and the adhesive pipeline are connected with a static mixer, the static mixer is connected with the rear row of granulation water inlet, the interval of the twisted tooth between the front row of granulation water inlet and the rear row of granulation water inlet is greater than the interval of the twisted tooth at the front end of the front row of granulation water inlet and the rear end of the rear row of granulation water inlet, and the gap between the twisted tooth and the inner wall of the shell between the front row of granulation water inlet and the rear row of granulation water inlet is greater than the gap between the twisted tooth and the inner wall of the shell at the front end of the front row of granulation water inlet and the rear end of the rear row of granulation water inlet.

2. The carbon black prilling system for improving the prilling effect according to claim 1, wherein The front row of granulation water inlet and the rear row of granulation water inlet are arranged in a circumferential shape on the surface of the shell.

3. The carbon black prilling system to improve the prilling effect according to claim 1, characterized in that, The front row of granulation water inlet is 100-150 mm away from the feeding port, and the rear row of granulation water inlet is 500-800 mm away from the feeding port.

4. The carbon black prilling system to improve the prilling effect according to claim 1, characterized in that, The interval of the twisted tooth between the front row of granulation water inlet and the rear row of granulation water inlet is 1.5-2 times the interval of the twisted tooth at the front end of the front row of granulation water inlet and the rear end of the rear row of granulation water inlet.

5. The carbon black prilling system to improve the prilling effect according to claim 1, characterized in that, The gap between the twisted tooth and the inner wall of the shell between the front row of granulation water inlet and the rear row of granulation water inlet is 6-10 mm, the gap between the twisted tooth and the inner wall of the shell at the front end of the front row of granulation water inlet and the rear end of the rear row of granulation water inlet is 3-6 mm, and the difference between the gap between the twisted tooth and the inner wall of the shell between the front row of granulation water inlet and the rear row of granulation water inlet and the gap between the twisted tooth and the inner wall of the shell at the front end of the front row of granulation water inlet and the rear end of the rear row of granulation water inlet is not less than 2 mm.

6. The carbon black prilling system to improve the prilling effect according to claim 1, characterized in that, Flow meters are arranged on the first process water pipeline, the second process water pipeline and the adhesive pipeline.

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