CN113877697B - Melt impact crushing and granulating system and method - Google Patents

Melt impact crushing and granulating system and method Download PDF

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CN113877697B
CN113877697B CN202111186275.5A CN202111186275A CN113877697B CN 113877697 B CN113877697 B CN 113877697B CN 202111186275 A CN202111186275 A CN 202111186275A CN 113877697 B CN113877697 B CN 113877697B
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impact
melt
gear
bevel gear
particle collecting
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CN113877697A (en
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于庆波
康天宇
王安邦
段文军
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Northeastern University China
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B02C19/005—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) the materials to be pulverised being disintegrated by collision of, or friction between, the material particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

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  • Crushing And Pulverization Processes (AREA)

Abstract

The invention provides a melt impact crushing granulation system and a melt impact crushing granulation method, wherein the melt impact crushing granulation system comprises a power transmission assembly, an impact crushing granulation assembly and a particle collection assembly; the particle collecting component comprises a cylindrical particle collecting device, and an area defined by the inner wall of the particle collecting device is a working cavity of the system; the impact crushing and granulating assembly is arranged in the working cavity and comprises a rotating shaft and an impact piece arranged on the rotating shaft; the impact piece is provided with a protruding structure for impacting the melt; the power transmission assembly is arranged outside the working cavity and is used for being connected with the rotating shaft and driving the striking piece to rotate. The invention provides a melt impact crushing and granulating system, and relates to a novel dry type granulating production technology, namely a melt impact crushing and granulating technology.

Description

Melt impact crushing and granulating system and method
Technical Field
The invention belongs to the technical field of granulation production and waste heat recovery, and particularly relates to a melt impact crushing granulation system and method.
Background
The granulation production process has very common requirements in production and life, for example, compared with decoction, the granule is more durable to store and convenient to use, and compared with tablets, the granule is absorbed more quickly; the fertilizer is convenient to store, transport and use after being granulated, and the fertilizer is beneficial to improving the fertilizing efficiency; the feeding and production cost can be reduced when the molten iron is made into particles instead of cast ingots; the slag particles made of the metallurgical slag can be used for producing cement and road padding. Taking the metallurgical industry as an example, the data of the national statistical bureau of China shows that the pig iron yield of China reaches 8.08 million tons in 2019, the annual production of a byproduct, namely blast furnace slag, is 2.5 million tons, the temperature during slag discharge is 1450-1650 ℃, the contained waste heat resources are equivalent to 1400 million tons of standard coal, account for about 30 percent of the waste heat generated by a steel plant, and the method brings energy conservation, emission reduction, heavy pressure and considerable waste heat recovery and resource utilization prospects.
Currently, the granulation processes mainly used in the metallurgical industry fall into two categories: water quenching and dry processing. The water quenching method is to directly impact the high-temperature melt by utilizing pressurized water jet, quickly cool the high-temperature melt to low temperature to solidify from outside to inside while impacting and crushing the high-temperature melt into fine particles, tend to solidify into spherical particles under the action of surface tension, and obtain a granulated product after dehydration treatment. Therefore, the method has simple technology and low cost and is generally adopted in the industry. However, the water quenching method has low temperature of the obtained particles and serious waste heat. The water quenching process needs to consume a large amount of water, sulfur in the high-temperature melt reacts with water to generate acid mist, heavy metals such as nickel and chromium in certain melt can easily enter the water, the generated sewage is low in recycling rate and difficult to treat in actual production, water resources are seriously consumed, the ecological environment is polluted, and the requirements of energy conservation and emission reduction can not be met.
The dry treatment method mainly comprises a wind quenching method, an extrusion crushing method and a centrifugal granulation method, and has the advantages of no water resource consumption and no need of drying treatment, but has respective defects. Compared with water quenching, the difference of the air quenching method is that the working medium is replaced by air, high-pressure air jet flow is used for impacting, crushing and cooling the high-temperature melt, the temperature of hot air and product particles obtained by the method is very high, waste heat is recovered efficiently, the energy consumption of continuous blowing is higher, and the particle size control of the produced particles is limited. The extrusion crushing method is to pour the broken solid material into the crack of the crushing pieces such as roller and toothed chain, and to destroy the solid structure by the continuous extrusion force generated to the material when the crushing pieces work, so that the material is crushed into particles gradually. The centrifugal granulation method is a method for breaking and granulating by utilizing centrifugal force and instability of moving fluid, high-temperature melt is poured onto rotating members such as a rotary table, an inclined wall rotating cup and a perforated rotating cup, the melt can be outwards spread into a liquid film on the rotating members under the action of rotating centrifugal force and friction force, the liquid film is thrown into the air along the tangential direction after reaching the edges of the rotating members, the liquid film is broken into a liquid column and then broken into granules by the aid of gradually increased instability degree of the moving fluid, the investment and operation cost is low, the operation process is simple, the automation degree is high, cotton-shaped objects can be generated by rotary drawing of the liquid film, the circumferential spreading of the liquid film enables the position of a transmission mechanism to be limited below the rotary table in a granulation bin, and a water-cooling wall is additionally arranged near the transmission mechanism to maintain long-time continuous production sometimes according to actual conditions.
In summary, there is a need for a granulation production technology with low pollution, low cost, simple operation process, good granulation effect, and flexible arrangement and convenient maintenance, which is beneficial to efficiently recovering waste heat, and can be applied to various industries with similar granulation production requirements, not only in the metallurgical industry.
Disclosure of Invention
The invention provides a melt impact crushing granulation system and a melt impact crushing granulation method aiming at the problems in the existing granulation production technology, and relates to a novel dry granulation production technology, namely a melt impact crushing granulation technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: a melt impact crushing and granulating system comprises a power transmission assembly, an impact crushing and granulating assembly and a particle collecting assembly;
the particle collecting component comprises a cylindrical particle collecting device, and an area defined by the inner wall of the particle collecting device is a working cavity of the system;
the impact crushing and granulating assembly is arranged in the working cavity and comprises a rotating shaft and an impact piece arranged on the rotating shaft; the impact piece is provided with a protruding structure for impacting the melt;
the power transmission assembly is arranged outside the working cavity and is used for being connected with the rotating shaft and driving the striking piece to rotate.
Further, the power transmission assembly is a shaft transmission assembly or a gear transmission assembly; the shaft transmission assembly comprises a driving motor for providing rotary power, and a motor shaft is used as a rotary shaft, or the motor shaft is connected with the rotary shaft through a flange and a coupling; the gear transmission assembly comprises a driving motor for providing rotary power and a transmission gear arranged on a motor shaft, and the transmission gear is connected with the rotating shaft; the transmission gear is a bevel gear or a cylindrical gear.
Further, the upper half part of the inner wall of the particle collecting device is a vertical wall surface, the lower half part of the inner wall of the particle collecting device is an inclined wall surface, and a particle outlet of the inclined wall surface is provided with a particle collecting tank or waste heat recovery equipment such as material conveying equipment or a waste heat boiler.
Further, the gear transmission assembly can adjust the position and the direction of the driving motor and the upper limit and the lower limit of the transmission rotating speed by replacing the type and the parameters of the transmission gear.
Further, the striking piece is a bevel gear or a cylindrical gear or a rotating drum with fins.
Further, when the impact piece is a bevel gear, the tooth width is 1.5-10 times of the diameter of the melt flow, and the indexing cone angle is 15-75 degrees;
when the impact piece is a cylindrical gear, the tooth height is 2-15 times of the diameter of the melt flow, the tooth pitch is 2-15 times of the diameter of the melt flow, and the tooth width is 1-10 times of the diameter of the melt flow;
when the impact piece is a rotary drum with fins, the fins are arranged along the circumferential direction of the rotary drum, the thickness of the fins along the circumferential direction of the rotary drum is 0.5-5 times of the diameter of the melt flow, the length of the fins along the radial direction of the rotary drum is 1.5-10 times of the diameter of the melt flow, and the length of the fins along the axial direction of the rotary drum is 1-10 times of the diameter of the melt flow.
Further, when the impact piece is a bevel gear, the method for determining the lower limit of the rotating speed of the bevel gear comprises the following steps: assuming that the falling speed of the melt flow at the impact point in actual operation is U and the number of bevel gears is z 1 If the indexing cone angle δ and the average tooth height of the molten flow impact area are h, the rotation speed n of the bevel gear should satisfy the following conditions:
Figure BDA0003299365390000031
Figure BDA0003299365390000032
namely: the rotating speed n of the bevel gear is larger than that of the bevel gear in working
Figure BDA0003299365390000033
To avoid the accumulation of melt flow on the bevel gear without impact crushing；
When the impact piece is a cylindrical gear, the method for determining the lower limit of the rotating speed of the cylindrical gear comprises the following steps: assuming that the falling speed of the melt flow reaching the impact point in actual operation is U, and the number of the cylindrical gears is z 2 And the tooth width is b, the rotating speed n of the cylindrical gear meets the following requirements:
Figure BDA0003299365390000034
Figure BDA0003299365390000035
namely: the rotating speed n of the cylindrical gear is larger than that of the cylindrical gear in work
Figure BDA0003299365390000036
To avoid the melt stream from passing over the impingement zone without being broken by impingement;
when the impact piece is a rotary drum with fins, the method for determining the lower limit of the rotary drum rotating speed comprises the following steps: assuming that the falling speed of the melt flow at the point of impact is U and the number of fins of the rotor is z in actual operation 3 And the length of the fin along the axial direction of the rotary drum is L, the rotating speed n of the bevel gear meets the following requirements:
Figure BDA0003299365390000037
Figure BDA0003299365390000038
namely: the rotating speed n of the rotating drum should be greater than
Figure BDA0003299365390000039
To avoid the melt stream from passing over the impingement zone without being broken by impingement.
Furthermore, water cooling and air cooling equipment is arranged on the particle collecting device and the power transmission assembly to maintain operation, and the particle collecting device and the power transmission assembly indirectly cool, impact, crush and granulate the assembly.
Furthermore, the melt can be arranged into a plurality of melt flows along the circumferential direction and the radial direction of the impact piece according to the requirement of treatment capacity, the moving path of each melt flow passes through the range of the protrusion structure of the impact piece, and the surface of the melt flow can be slightly cooled before impact, but the fluid property can still be maintained.
The invention also provides a granulation method based on the system, which comprises the following steps: the melt flows out of the launder and enters a working cavity of the system, when the melt moves to the range of the protruding structure of the impact piece, the impact piece rotates at the rotating speed of 150-2000 rpm, the protruding structure moving at high speed impacts and breaks the melt flow into molten drops with the diameter of less than 10mm, the molten drops are rapidly cooled into particles in the splashing process, and the particles rebound and fall down after impacting the inner wall of the particle collecting assembly, roll down along the inclined inner wall of the lower half part and are collected.
The granulation technology principle used by the invention is that after the moving fluid and the solid are impacted, the fluid structure is deformed under the action of external force, and the structural instability develops along with the deformation to cause the fluid to be crushed.
Compared with the prior art, the invention has the beneficial effects that:
according to the melt impact crushing and granulating system and the impact crushing and granulating method using the granulating system, the raw materials are impacted and crushed when being in a molten state by virtue of a fluid impact unstable crushing principle, so that the raw materials are granulated into spherical particles, the crushing process is rapid, the probability of occurrence of wire drawing is reduced, the granulating effect is good, the operation flow is simple, the energy consumption is low, the environment is friendly, convenience is provided for waste heat recovery, the production and operation cost is obviously reduced, and the industry competitiveness is enhanced.
Drawings
FIG. 1 is a schematic diagram of a system for impact breaking and granulating a melt;
FIG. 2 is a schematic view of a cylindrical gear structure of the striking member;
FIG. 3 is a schematic view of a finned drum of the impingement member;
FIG. 4 is a schematic view of a bevel gear structure in the gear assembly;
FIG. 5 is a schematic view of a cylindrical gear in the gear assembly;
wherein, 1, a driving motor; 2, a coupler; 3-a rotating shaft; 4-bevel gear; 5-a particle collection device; 6-a launder; 7-cooling water tank; 8, water cooling wall; 9-cylindrical gear; 10-a rotating drum; 11-bevel gear transmission; 12-cylindrical gear transmission.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Referring to fig. 1, 2 and 3, the invention provides a melt impact crushing granulation system, which comprises a power transmission assembly, an impact crushing granulation assembly and a particle collection assembly; the particle collecting component comprises a cylindrical particle collecting device 5, and the region defined by the inner wall of the particle collecting device is a working cavity of the system; the impact crushing and granulating assembly is arranged in the working cavity and comprises a rotating shaft 3 and an impact piece arranged on the rotating shaft, and the power transmission assembly is arranged outside the working cavity and is connected with the rotating shaft to drive the impact piece to rotate; the melt was introduced into the working chamber of the system through a launder 6, each melt stream having a diameter of 20mm and a falling speed of 3m/s.
The upper half part of the inner wall of the particle collecting device is a vertical wall surface, the lower half part of the inner wall of the particle collecting device is an inclined wall surface, and a particle collecting groove, or a material conveying device or a waste heat recovery device is arranged at a particle outlet of the inclined wall surface. The working chamber of the particle collecting device can contain broken molten drops which are separated from the tooth surface and splash in the working chamber, the upper half inner wall surface blocks the molten drops which are rapidly cooled into particles in the splashing process, the particles which are blocked to fall roll along the inclined inner wall surface of the lower half part of the collecting device and are collected, the collected particles can be further subjected to waste heat recovery through waste heat recovery equipment, and the waste heat recovery equipment can be a waste heat boiler which is used for performing water-cooling heat exchange on heat exchange tubes, heat exchange wall surfaces and slag particles.
Wherein, the inner wall of the particle collecting device 5 is additionally provided with a water-cooled wall 8 to accelerate particle cooling and recover waste heat.
Wherein the power transmission assembly is a shaft transmission assembly or a gear transmission assembly; the shaft transmission assembly comprises a driving motor for providing rotary power, and a motor shaft is used as a rotary shaft, or the motor shaft is connected with the rotary shaft through a flange and a coupler; the gear transmission assembly comprises a driving motor for providing rotary power and a transmission gear arranged on a motor shaft, and the transmission gear is connected with the rotating shaft; the transmission gear is a bevel gear or a cylindrical gear. The driving motor 1 is placed in the cooling water tank 7 to dissipate heat and cool to maintain operation, and indirectly cools the rotating shaft 3 and the impact member.
The impact member is a bevel gear 4, a cylindrical gear 9 or a rotating drum 10 with fins, the structural schematic diagrams are shown in fig. 1, 2 and 3, and the number of teeth and the number of fins are selected according to requirements.
The selection of the specific power transmission assembly and striker of the present invention is shown in examples 1, 2 and 3.
Example 1
In the embodiment, the impact piece is a bevel gear, and the tooth surface of the bevel gear faces the falling direction of the melt; the number of teeth of the bevel gear is 30, the tooth width is 100mm, the indexing cone angle is 45 degrees, the average tooth height of an impact area with the melt flow is 50mm, and the rotating speed of the bevel gear is 500 revolutions per minute (greater than the lower limit of the rotating speed) during working
Figure BDA0003299365390000051
)；
In this embodiment, the power transmission assembly includes a driving motor 1 and a coupling 2, the driving motor 1 provides a driving force, and the driving force drives the rotating shaft 3 of the impact crushing and granulating assembly to start rotating under the connection transmission of the coupling 2, so as to drive the bevel gear 4 serving as an impact member on the rotating shaft.
The working principle of the system in this embodiment is as follows:
starting a driving motor 1, and driving a rotating shaft 3 of an impact crushing and granulating assembly to rotate by a stably rotating motor shaft through the connection of a coupler 2, so as to drive a bevel gear 4 serving as an impact piece to rotate and gradually reach and maintain a preset rotating speed; the diversion is started, so that the melt flows out along the launder 6 and is guided into a working cavity of the system, when the melt flow moves to the range where the teeth of the bevel gear 4 are located, the tooth surface of the gear which moves at a high speed impacts the tail end from the side surface so as to separate and take away a part of the melt, due to the action of the high-speed impact, the taken away part of the melt deforms on the tooth surface and spreads in a divergent shape along the tooth surface, the instability of the fluid structure is continuously increased in the spreading process until the melt is broken into melt drops with the diameter of less than 10mm, and then the broken melt drops are separated from the tooth surface of the bevel gear 4 under the actions of rebound splashing and centrifugal force of the rotary motion of the gear; after the molten drop that obtains by bevel gear 4 impact breakage breaks away from the flank of tooth, the molten drop splashes in particle collection device 5's working chamber, because of the broken specific surface area that leads to of melt flow suddenly increases, the molten drop is at the in-process that splashes cooling rapidly, and the flow viscidity of fuse-element increases and is inwards solidified gradually by the shell, and the whereabouts of kick-backing after striking to particle collection device 5 upper half internal face rolls and is collected along collection device lower half slope internal face, finally collects and obtains the granule.
Example 2
In the embodiment, the impact piece is a cylindrical gear, and the arrangement mode is that the end face of the cylindrical gear faces upwards (the end face of the cylindrical gear faces towards the falling direction of the melt), the melt falls between tooth gaps, and then the melt is impacted from the side by a tooth surface; the number of teeth of the cylindrical gear is 30, the tooth height is 100mm, the tooth pitch is 100mm, the tooth width is 100mm, and the rotating speed of the cylindrical gear is 500 rpm (greater than the lower limit of the rotating speed) during working
Figure BDA0003299365390000061
)。
In the embodiment, the power transmission assembly is a gear transmission assembly and is used for adjusting the position and the direction of the driving motor and the upper limit and the lower limit of the transmission rotating speed, the gear transmission assembly comprises a driving motor for providing rotating power and a transmission gear arranged on a motor shaft, and the transmission gear is connected with a rotating shaft; the transmission gear is a bevel gear, as shown in fig. 4, the bevel gear is adopted for transmission 11, and a vertically arranged motor is changed into a horizontally arranged motor under the condition that the position of the impact piece is not changed, so that the impact piece can still be driven to rotate; meanwhile, the gear transmission ratio influences the range of the output rotating speed, and the upper limit and the lower limit of the transmission rotating speed can be adjusted.
The rest of the system in this embodiment is the same as that in embodiment 1, and the working principle of this embodiment is the same as that in embodiment 1 except that the striking member and the power transmission assembly are arranged differently.
Example 3
In this embodiment, the impacting member is a rotating drum with fins, and is arranged in such a manner that the end surface of the rotating drum faces upwards (the end surface of the rotating drum faces towards the falling direction of the melt), the melt falls between fin gaps, and then the fin impacts the melt from the side, 6 fins are arranged on the rotating drum, the thickness of the fins along the circumferential direction of the rotating drum is 30mm, the length of the fins along the radial direction of the rotating drum is 100mm, the length of the fins along the axial direction of the rotating drum is 100mm, and the rotating speed of the rotating drum with the fins during operation is 1000 rpm (greater than the lower limit of the rotating speed)
Figure BDA0003299365390000062
Figure BDA0003299365390000063
)。
In the embodiment, the power transmission assembly is a gear transmission assembly and is used for adjusting the position and the direction of the setting of the driving motor and the upper limit and the lower limit of the transmission rotating speed, the gear transmission assembly comprises the driving motor for providing rotating power and a transmission gear arranged on a motor shaft, and the transmission gear is connected with the rotating shaft; the transmission gear is a cylindrical gear, as shown in fig. 5, the cylindrical gear is adopted for transmission 12, the motor can be arranged at the side direction of the impact piece under the condition that the position of the impact piece is not changed, meanwhile, the gear transmission ratio influences the range of the output rotating speed, and the upper limit and the lower limit of the transmission rotating speed can be adjusted.
The various impact members and transmission modes can be selected and combined according to actual conditions, the rest of the system in the embodiment is the same as that in embodiment 1, and the working principle of the embodiment is the same as that in embodiment 1 except that the impact members and the power transmission assembly are arranged differently.
The technical idea of the present invention is described in the above technical solutions, and the protection scope of the present invention is not limited thereto, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention belong to the protection scope of the technical solutions of the present invention.

Claims (8)

1. A melt impact crushing granulation system characterized by: comprises a power transmission component, an impact crushing and granulating component and a particle collecting component;
the particle collecting component comprises a cylindrical particle collecting device, and a region defined by the inner wall of the particle collecting device is a working cavity of the system;
the impact crushing and granulating assembly is arranged in the working cavity and comprises a rotating shaft and an impact piece arranged on the rotating shaft; the impact piece is provided with a protruding structure for impacting the melt;
the power transmission assembly is arranged outside the working cavity and is used for being connected with the rotating shaft and driving the impacting piece to rotate;
the impact piece is a bevel gear or a cylindrical gear or a rotary drum with fins;
when the impact piece is a bevel gear, the method for determining the lower limit of the rotating speed of the bevel gear comprises the following steps: assuming that the falling speed of the melt flow reaching the impact point in actual operation is U, and the number of bevel gears is z 1 If the indexing cone angle δ and the average tooth height of the molten flow impact area are h, the rotation speed n of the bevel gear should satisfy the following conditions:
Figure FDA0003954541430000011
Figure FDA0003954541430000012
namely: the rotating speed n of the bevel gear is larger than that of the bevel gear in working
Figure FDA0003954541430000013
Rotating/dividing to avoid accumulation of melt flow on the bevel gear without impact crushing;
when the impact piece is a cylindrical gear, the method for determining the lower limit of the rotating speed of the cylindrical gear comprises the following steps: assuming that the falling speed of the melt flow reaching the impact point in actual operation is U, and the number of the cylindrical gears is z 2 And the tooth width is b, the rotating speed n of the cylindrical gear should satisfy:
Figure FDA0003954541430000014
Figure FDA0003954541430000015
namely: the rotating speed n of the cylindrical gear is larger than that of the cylindrical gear during working
Figure FDA0003954541430000016
Rpm to avoid the melt stream from passing over the impingement zone without being crushed by impingement;
when the impact piece is a rotary drum with fins, the method for determining the lower limit of the rotary drum rotating speed comprises the following steps: assuming that the falling speed of the melt flow at the point of impact is U and the number of fins of the rotor is z in actual operation 3 And the length of the fin along the axial direction of the rotary drum is L, the rotating speed n of the bevel gear meets the following conditions:
Figure FDA0003954541430000017
Figure FDA0003954541430000018
namely: the rotating speed n of the rotating drum during operation is larger than
Figure FDA0003954541430000021
Rpm to avoid the melt stream from passing over the impingement zone without being broken by impingement.
2. The melt impact shatter and pelletization system of claim 1, wherein: the power transmission assembly is a shaft transmission assembly or a gear transmission assembly; the shaft transmission assembly comprises a driving motor for providing rotary power, and a motor shaft is used as a rotary shaft, or the motor shaft is connected with the rotary shaft through a flange and a coupler; the gear transmission assembly comprises a driving motor for providing rotating power and a transmission gear arranged on a motor shaft, the transmission gear is connected with the rotating shaft, and the transmission gear is a bevel gear or a cylindrical gear.
3. The melt impact shatter and pelletization system of claim 1, wherein: the upper half part of the inner wall of the particle collecting device is a vertical wall surface, the lower half part of the inner wall of the particle collecting device is an inclined wall surface, and a particle collecting tank or a material conveying device or a waste heat recovery device is arranged at a particle outlet of the inclined wall surface.
4. The melt impact shatter and pelletization system of claim 2, wherein: the gear transmission assembly adjusts the position and the direction of the driving motor and the upper limit and the lower limit of the transmission rotating speed by replacing the type and the parameters of the transmission gear.
5. The melt impact crush granulation system of claim 1, wherein:
when the impact piece is a bevel gear, the tooth width is 1.5-10 times of the diameter of the melt flow, and the indexing cone angle is 15-75 degrees;
when the impact piece is a cylindrical gear, the tooth height is 2-15 times of the diameter of the melt flow, the tooth pitch is 2-15 times of the diameter of the melt flow, and the tooth width is 1-10 times of the diameter of the melt flow;
when the impact piece is a rotary drum with fins, the fins are arranged along the circumferential direction of the rotary drum, the thickness of the fins along the circumferential direction of the rotary drum is 0.5-5 times of the diameter of the melt flow, the length of the fins along the radial direction of the rotary drum is 1.5-10 times of the diameter of the melt flow, and the length of the fins along the axial direction of the rotary drum is 1-10 times of the diameter of the melt flow.
6. The melt impact crush granulation system of claim 1, wherein: and the particle collecting device and the power transmission assembly are provided with water cooling and air cooling equipment for maintaining operation and indirectly cooling, impacting, crushing and granulating assemblies.
7. The melt impact shatter and pelletization system of claim 1, wherein: the melt can be arranged into a plurality of melt streams along the circumferential direction and the radial direction of the impact piece according to the requirement of handling capacity, and the moving path of each melt stream passes through the range of the protruding structure of the impact piece.
8. A granulation method based on the system as claimed in any one of claims 1 to 7, characterized in that: the method comprises the following steps: the melt flows out of the launder and enters a working cavity of the system, when the melt moves to the range of the protruding structure of the impact piece, the impact piece rotates at the rotating speed of 150-2000 rpm, the protruding structure moving at high speed impacts and breaks the melt flow into molten drops with the diameter of less than 10mm, the molten drops are rapidly cooled into particles in the splashing process, and the particles rebound and fall down after impacting the inner wall of the particle collecting assembly, roll down along the inclined inner wall of the lower half part and are collected.
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