CN112156872A - Waste tire pyrolytic carbon circulating fluidized bed air flow pulverizer - Google Patents

Abstract

The invention relates to the technical field of environmental protection, in particular to an air flow pulverizer of a waste tire pyrolytic carbon circulating fluidized bed. The method is characterized in that: comprises an airflow crusher and a material returning device of a circulating fluidized bed; the air flow crusher comprises a compressed inert non-condensable gas nozzle, an air mixing cone, an inlet enclosure, a first-stage stationary blade grid, a first-stage driving impeller, a first-stage differential impeller, a second-stage stationary blade grid, a second-stage driving impeller, a second-stage differential impeller, a working enclosure, a turbofan, an outlet enclosure, a bearing box and a driving shaft, wherein the circulating fluidized bed material returning device comprises a circulating fluidized bed body, a vibrating bag filter, a vertical pipe, a U-shaped material returning bent pipe, a hood and a fluidizing air chamber, fluidizing air led out from a side branch of the outlet enclosure performs dispersion fluidization on coarse pyrolytic carbon particles through the fluidizing air chamber and the hood, and the coarse pyrolytic carbon particles are continuously conveyed to the air mixing cone through the U-shaped material returning bent pipe.

Description

Waste tire pyrolytic carbon circulating fluidized bed air flow pulverizer

Technical Field

The invention relates to the technical field of environmental protection, in particular to an air flow pulverizer of a waste tire pyrolytic carbon circulating fluidized bed.

Background

Waste tires are common solid waste pollutants, people recycle the waste tires through a plurality of ways to realize harmless treatment, wherein the preparation of fuel oil and carbon black through pyrolysis of the waste tires is one of the solutions, solid products after pyrolysis of the waste tires comprise pyrolytic carbon and waste steel wires, and further the pyrolytic carbon needs to be subjected to processes of protection, temperature reduction, iron removal separation, crushing, grinding and the like to prepare the carbon black. The Chinese invention patent (patent application number of 201711004094.X, the patent name is a fluidized bed airflow crusher and an airflow crushing method) discloses a fluidized bed airflow crusher and an airflow crushing method, which comprise a crushing chamber, wherein a plurality of horizontal nozzles are uniformly distributed on the inner wall of the crushing chamber on a horizontal plane vertical to the axis of the crushing chamber, an inclined nozzle is arranged between every two adjacent horizontal nozzles, the inclined nozzles and the horizontal nozzles are positioned on the same horizontal plane, the inclined nozzles are uniformly distributed along the inner wall of the crushing chamber, the inclined nozzles and the two adjacent horizontal nozzles are arranged at equal intervals, and the inclined nozzles point to the bottom of the crushing chamber. The fluidized bed jet mill provided by the invention can be directly transformed and manufactured on the basis of the existing fluidized bed jet mill in the background technology, so that the manufacturing cost can be greatly reduced, the existence of bottom materials is greatly reduced, and the milling efficiency is improved. The invention also provides a using method of the fluidized bed jet mill. The Chinese patent of the invention (with the patent number of CN201820937181.4, the patent name of fluidized bed jet mill and fluidized bed jet mill production line) discloses a fluidized bed jet mill and a fluidized bed jet mill production line, which is characterized in that: including establishing crushing barrel (2.1) of lower part, establishing hierarchical barrel (2.2) on upper portion, the lateral wall of crushing barrel (2.1) is equipped with a plurality of laval nozzles (2.3) along the circumference interval, be equipped with hierarchical wheel (2.4) on hierarchical barrel (2.2), fix actuating mechanism in hierarchical barrel (2.2) one side, fix play feed cylinder (2.6) at hierarchical barrel (2.2) opposite side, actuating mechanism includes pivot (2.5), hierarchical wheel (2.4) are including stiff end (2.4.1) and free end (2.4.2), stiff end (2.4.1) are fixed in pivot (2.5), its characterized in that: free end (2.4.2) and play feed cylinder (2.6) realize the movive seal through first labyrinth air seal structure, first labyrinth air seal structure is including establishing a plurality of first bulge loops (2.4.2.1) that the interval on the terminal surface of free end (2.4.2) set up, establish on play feed cylinder (2.6) with a plurality of first bulge loops (2.4.2.1) one-to-one setting and clearance fit in order to constitute a plurality of first annular (2.6.1) of the air current passageway of labyrinth, be equipped with first inlet air duct in play feed cylinder (2.6), first inlet air duct one end and first annular (2.6.1) bottom surface intercommunication, the first inlet air duct other end communicates with outside air supply.

In the first and second prior art, a Laval nozzle is adopted to carry out supersonic collision, friction and shearing crushing on materials, then a classifier is adopted to collect finished products, and the material particles with larger particle sizes are not returned to be crushed, so that the particle sizes of the particles can not be screened out completely and are distributed in a larger range by the airflow crushing method.

Disclosure of Invention

In view of the above problems, the present invention provides a circulating fluidized bed air-jet pulverizer for pyrolysis carbon of waste tires, which is characterized in that: comprises an airflow crusher and a material returning device of a circulating fluidized bed.

The airflow crusher comprises a compressed inert non-condensable gas nozzle, a gas mixing cone, an inlet enclosure, a first-stage stationary blade grid, a first-stage driving impeller, a first-stage differential impeller, a second-stage stationary blade grid, a second-stage driving impeller, a second-stage differential impeller, a working enclosure, a turbofan, an outlet enclosure, a bearing box and a driving shaft, wherein pyrolytic carbon particles in a storage bin are poor in flowability, the compressed inert non-condensable gas is required to be dispersedly guided into the inlet enclosure, meanwhile, coarse pyrolytic carbon particles returned by a circulating fluidized bed return feeder injected by the compressed inert non-condensable gas nozzle are injected into the inlet enclosure through the gas mixing cone to be mixed with the pyrolytic carbon particles in the storage bin, mixed gas is uniformly distributed and splashed to the first-stage stationary blade grid through the guide of a flow passage of the inlet enclosure, the first-stage stationary blade grid is embedded and fastened in the working enclosure, the mixed gas flow is accelerated to supersonic speed after passing through the narrow throat of the first-stage stationary blade, the flow channel guides the airflow to turn repeatedly, impact continuously and compress and collide when the mixed airflow is pressurized by applying work, pyrolytic carbon particles collide with each other, rub and are sheared and broken into ultrafine particles under the guidance of high-speed airflow, blade root airflow attack angles of a first-stage driving impeller and a first-stage differential impeller are different by 1-2 degrees, the factors of keeping dynamic balance, reducing vibration of a driving shaft and prolonging the service life of a bearing box are considered except increasing the turning strength of the airflow, the first-stage driving impeller and the first-stage differential impeller are provided with through holes for the through flow of the mixed airflow, the working principles of a second-stage stationary blade, a second-stage driving impeller and a second-stage differential impeller are the same, a turbofan is designed in an outlet enclosure, and the mixed airflow is discharged to a material returning.

The material returning device of the circulating fluidized bed comprises a circulating fluidized bed body, a vibration type bag filter, a vertical pipe, a U-shaped material returning bent pipe, a blast cap and a fluidized air chamber, wherein the circulating fluidized bed body plays a role in diffusing and uniformly speed inputting mixed air flow, the mixed air flow enters the vibration type bag filter through the circulating fluidized bed body, qualified ultrafine pyrolytic carbon particles are collected and returned to a bin after being filtered along with mixed gas flow, unqualified coarse pyrolytic carbon particles fall into a vertical pipe and are accumulated to a certain height to form a material column, the static pressure formed by the coarse pyrolytic carbon particle material column in the vertical pipe drives the material column to be conveyed to a gas mixing cone through a U-shaped material returning bent pipe, the higher the material column accumulation is, the higher the moving speed is, make in the riser thick pyrolytic carbon particle accomodate discharge amount both realize balancing, the stock column keeps certain height and forms the material seal, and the fluidization wind that draws from export surrounding shell collateral branch is through fluidization plenum, hood to implement dispersion fluidization to thick pyrolytic carbon particle to continuously carry thick pyrolytic carbon particle to the gas mixing awl through U type material return bend.

The inventor finds that the tire consists of an outer tire, an inner tire and a cushion belt, the outer tire consists of three main parts, namely a tire body, a tire tread and a tire bead, the tire body is formed by attaching a plurality of layers of rubberized cord fabrics according to a certain angle, and the cord fabrics are usually made of high-strength steel wires and synthetic fiber rubberized fabrics; the tread contacts with the ground and is made of heat-resistant and shear-resistant rubber materials; the tyre bead is used for tightly fixing the tyre on a wheel rim, and mainly comprises a steel wire ring, triangular filling rubber and steel wire ring wrapping cloth. The pneumatic tire can be classified into a car tire, a truck tire, an agricultural tire, an engineering tire, a special vehicle tire, an aircraft tire, a motorcycle tire and a bicycle tire according to the application of the pneumatic tire, and the recycled waste tire is generally a car tire, a truck tire, an agricultural tire, a motorcycle tire and a bicycle tire, and the structure of the waste tire is generally an oblique tire and a radial tire. The recovered waste tires are used for building fillers, highway fillers, regenerated rubber preparation, fuel oil and carbon black preparation by pyrolysis and the like.

The inventor finds that the process for preparing fuel oil and carbon black by pyrolyzing waste tires requires the processes to be carried out in a vacuum, inert gas protection and anaerobic closed environment, and the process is currently put into industrial production methods such as reaction kettle pyrolysis, rotary reaction furnace pyrolysis, vertical tower pyrolysis and the like. Although the pyrolysis method of the reaction kettle has the advantage that the whole material is fed without being crushed, the pyrolysis method has high energy consumption and low finished product yield and is difficult to popularize due to the reason that continuous production cannot be realized; the rotary reaction furnace pyrolysis method is difficult to popularize due to the reasons that feeding and discharging are difficult, pollutants are easy to leak through high-temperature dynamic sealing and the like; the vertical tower pyrolysis method has the advantages from the thermodynamic point of view undoubtedly compared with the first two methods, the power of the material from top to bottom is provided by gravity, the hot air completes heat exchange with the material from bottom to top, the feeding and discharging and the heat exchange are easy to implement, the vertical tower is static equipment, and the high-temperature sealing problem is easy to solve, but the technical problem that a discharge channel is blocked by a rubber jelly and a steel wire ball which are reformed after long chain breakage of rubber exists in the pyrolysis process of the waste tires, the surface of the waste tires is further pyrolyzed to generate pyrolytic carbon crust and the interior of the waste tires is prevented from being pyrolyzed continuously, and the technical problem that the pyrolysis efficiency is low due to the low thermal conductivity of the waste.

The inventor finds that pyrolysis of waste tires mainly aims at recycling pyrolysis oil and pyrolysis carbon to further prepare products such as fuel oil and carbon black, and the pyrolysis gas is uneconomical if being used as a main product, because the yield of the pyrolysis gas is improved and a higher pyrolysis temperature (550-600 ℃) is needed to break pyrolysis oil chain hydrocarbon with a larger molecular weight to generate pyrolysis gas mainly containing methane, ethane, ethylene, propylene and other components with a smaller molecular weight, and the higher pyrolysis temperature causes a part of energy to be wasted on a damaged molecular chain, so that the pyrolysis gas generated by degrading the pyrolysis oil is flammable and explosive and is not easy to store and transport; in order to reduce the manufacturing cost of the pyrolysis reaction furnace and meet the requirements of mechanical processing, Q345R steel is selected as a furnace body material, the allowable stress requirement of the Q345R steel at high temperature is considered, namely the steel is used at the temperature of not more than 475 ℃, the comprehensive consideration of the factors is taken, the pyrolysis process temperature of the waste tires is designed to be 350-400 ℃, the heat source for pyrolyzing the waste tires is high-temperature flue gas generated by recycling pyrolysis gas, the pyrolysis gas is non-condensable combustible gas after pyrolysis oil is condensed at normal temperature, and the low-grade heat value is 17-54 MJ/Nm³. Due to the requirements of heat transfer efficiency and heat transfer temperature difference, the temperature of the flue gas from the outlet of the waste tire pyrolysis gas combustion kiln to the jacket of the vertical pyrolysis tower body and the inlet of the rotary rake roller is controlled between 550 and 560 ℃, and the flue gas passes through the vertical pyrolysis tower body,The exhaust gas temperature after heat exchange of the rotary rake roller is 410-420 ℃, and the average heat transfer temperature difference is 140 ℃, so that the pyrolysis gas combustion kiln can regulate and control the temperature of high-temperature flue gas generated by pyrolysis gas combustion, a cold source needs to be introduced to be mixed with the high-temperature flue gas, and the required temperature of the pyrolysis process is achieved by regulating the component ratio of the rotary rake roller to the high-temperature flue gas.

The inventor finds that in the waste tire pyrolysis process, the requirements of material balance, water (steam) balance and energy balance and the total targets of saving energy, reducing emission and recycling, the oxygen content of the exhaust gas after the high-temperature flue gas output by the pyrolysis gas combustion kiln is subjected to heat exchange through the vertical pyrolysis tower body and the rotary rake roller is reduced to be less than 3%, the temperature is 410-420 ℃, the pressure bearing of the rotary rake roller under the dynamic seal high-temperature working condition is limited, and the designed absolute pressure is not more than 105kPa, so that the pressure index of the exhaust gas is lower than the pressure requirements of a secondary air inlet of a combustor and a cold source at an inlet of the pyrolysis gas combustion kiln of 112-118 kPa, and the exhaust gas cannot be directly recycled. According to the operating principle of turbocharging, considering that the pressure of the discharged waste gas is low, selecting an axial air inlet and vertical upward exhaust mode with small pressure loss at the air inlet end, and using a cantilever type rotor structure, the discharged waste gas is expanded through a static blade grid and a movable blade wheel to do work, the heat energy is converted into mechanical energy for rotating the movable blade wheel, the movable blade wheel drives a planetary speed increaser to drive the air turbine, the air turbine pumps the air to pressurize and enter a combustor, a blower required by premixed air conveyed by the combustor is replaced, but the absolute pressure of an inlet of the discharged waste gas is 105kPa, an outlet of the discharged waste gas is directly communicated with a chimney, namely, the backpressure of a waste gas turbine is 101 kPa, the pressure difference of the inlet and the outlet is not enough to overcome the pressure loss of a flow passage of the static blade grid and the movable blade wheel to cause the rotation, the outlet pressure of the discharged waste gas is reduced to 50-55 kPa, the pressure difference between the inlet and the outlet of the waste gas turbine reaches 52-57 kPa, and the movable impeller can work reliably. The steam source of the steam jet pump is saturated steam generated by condensation of pyrolysis oil, the pressure is 0.35-0.4 MPa, the exhaust gas and steam mixed gas at the outlet of the steam jet pump are sent to an expansion tank, non-condensable gas in the expansion tank is inert tail gas, the inert tail gas has three purposes, one of the inert tail gas serves as a cold source for adjusting the temperature of the pyrolysis gas combustion kiln, the other inert tail gas serves as an air source for adjusting the coefficient of excess air of a pyrolysis gas combustor, and the third inert tail gas serves as inert protective gas required by purging of a middle-section bell jar storage bin.

The inventor finds that the inert tail gas is further cooled to normal temperature and is dehydrated to obtain the inert non-condensable gas, the oxygen content is less than 3 percent, and the moisture content is less than 0.3g/m³The temperature is 20-25 ℃, the temperature of pyrolytic carbon discharged from a pyrolytic reaction furnace is 350-400 ℃, inert non-condensable gas can be used as protective cooling working gas for pyrolytic carbon crushing and grinding, the sedimentation rate of pyrolytic carbon particles and waste steel wires after chain roller crushing and grinding is obviously different, and the inert non-condensable gas is used for separating the pyrolytic carbon particles and the waste steel wires, so that the chain roller rotary drum can be designed to achieve the purpose. The chain roller rotary drum comprises a blower, a feeding cover box, a drum body, chain rollers, a carrier roller assembly, a driving gear assembly, a discharging cover box, a bag type trap and a guide plate, wherein the drum body is supported by the carrier roller assembly and rotates at a constant speed under the driving of the driving gear assembly, the rotating speed is 1.5-2.5 r/min, the inclined included angle of the drum body is 1-2 degrees, the head end and the tail end of the drum body respectively extend into the feeding cover box and the discharging cover box, the drum body, the feeding cover box and the discharging cover box are designed with mechanical seals to prevent pyrolytic carbon particle leakage, a chain roller is freely arranged in the drum body and is formed by connecting a plurality of groups of chilled cast iron rollers, every two chilled cast iron rollers are connected through a spherical hinge and an anchor chain, the corrugated pipe is covered outside the spherical hinge and the anchor chain to prevent waste steel wires from invading, the chain roller is fixed on the feeding cover box through the anchor chain, and freely rotates along with the drum body, each group of chilled iron rollers can independently work Under the condition, the continuous effective work of adjacent chilled cast iron rollers cannot be influenced, the space between every two chilled cast iron rollers can contain waste steel wires to play a role of a chip groove, so that the waste steel wires cannot be accumulated into a cluster and continuously move to the tail end of the cylinder body, the inert noncondensable gas is input into the cylinder body by the blowing device, and particles formed by grinding and grinding the working surface of pyrolytic carbon between the chilled cast iron rollers and the cylinder body rise along with the rotation of the cylinder body and fall and settle in the process of rising and falling with the inert gasNon-condensable gas mass transfer heat transfer, when pyrolytic carbon particles and steel scrap wires move to the barrel tail end at last, the design is that the guide plate at the barrel tail end lifts up pyrolytic carbon particles and steel scrap wires and highly throws off the barrel, utilizes the obvious difference of the settling rate of the pyrolytic carbon particles and the steel scrap wires after the chain roller crushing and grinding, carries the pyrolytic carbon particles through the discharging cover box at the through-flow inert non-condensable gas of the barrel, and sends the pyrolytic carbon particles to the bag type trap for trapping, and the steel scrap wires fall into the discharging cover box.

The inventor finds that the particle size of pyrolytic carbon obtained by chain roller rotary roller grinding is 41-57 mu m, if the pyrolytic carbon is further subjected to ultrafine grinding by a circulating fluidized bed airflow grinder, the particle size reaches 0.5-1 mu m, the performance index meets the standard of 'waste tire pyrolysis carbon black' HG/T5459-2018, and part of the performance index reaches the standard of N330 carbon black, so that the pyrolytic carbon can be used for replacing part of functional carbon black.

The inventor finds that the circulating fluidized bed airflow crusher comprises an airflow crusher and a circulating fluidized bed return feeder, the airflow crusher comprises a compressed inert non-condensable gas nozzle, an air mixing cone, an inlet enclosure, a first-stage stationary blade grid, a first-stage driving impeller, a first-stage differential impeller, a second-stage stationary blade grid, a second-stage driving impeller, a second-stage differential impeller, a working enclosure, a turbine fan, an outlet enclosure, a bearing box and a driving shaft, pyrolytic carbon particles in a storage bin are poor in flowability, the compressed inert non-condensable gas needs to be dispersedly guided into the inlet enclosure, meanwhile, coarse pyrolytic carbon particles returned by the circulating fluidized bed return feeder which is injected by the compressed inert non-condensable gas nozzle are injected into the inlet enclosure through the air mixing cone and are mixed with the pyrolytic carbon particles in the storage bin, the mixed gas is uniformly distributed and splashed to the first-stage stationary blade grid through the guide of a flow passage of the inlet enclosure, the first-stage stationary blade grid is embedded and fastened, the mixed airflow is accelerated to supersonic speed, at the moment, a primary driving impeller and a primary differential impeller rotate at high speed under the drive of a driving shaft, a flow channel guides the airflow to repeatedly turn, continuously impact and compress and collide while the mixed airflow is acted and pressurized, pyrolytic carbon particles collide with each other, rub and shear into ultrafine particles under the guide of the high-speed airflow, the difference of the blade root airflow angles of the primary driving impeller and the primary differential impeller is 1-2 degrees, the factors of keeping dynamic balance, reducing the vibration of the driving shaft and prolonging the service life of a bearing box are considered besides increasing the turning strength of the airflow, the primary driving impeller and the primary differential impeller are provided with through holes for the through flow of the mixed airflow, a secondary static blade, a secondary driving impeller and a secondary differential impeller work principle are the same, a turbofan is designed in an outlet enclosure, and the mixed airflow is discharged to a return feeder of a circulating fluidized; the material returning device of the circulating fluidized bed comprises a circulating fluidized bed body, a vibration type bag filter, a vertical pipe, a U-shaped material returning bent pipe, a blast cap and a fluidized air chamber, wherein the circulating fluidized bed body plays a role in diffusing and uniformly speed inputting mixed air flow, the mixed air flow enters the vibration type bag filter through the circulating fluidized bed body, qualified ultrafine pyrolytic carbon particles are collected and returned to a bin after being filtered along with mixed gas flow, unqualified coarse pyrolytic carbon particles fall into a vertical pipe and are accumulated to a certain height to form a material column, the static pressure formed by the coarse pyrolytic carbon particle material column in the vertical pipe drives the material column to be conveyed to a gas mixing cone through a U-shaped material returning bent pipe, the higher the material column accumulation is, the higher the moving speed is, make in the riser thick pyrolytic carbon particle accomodate discharge amount both realize balancing, the stock column keeps certain height and forms the material seal, and the fluidization wind that draws from export surrounding shell collateral branch is through fluidization plenum, hood to implement dispersion fluidization to thick pyrolytic carbon particle to continuously carry thick pyrolytic carbon particle to the gas mixing awl through U type material return bend.

Compared with the prior art, the invention at least has the following advantages: the method is characterized in that airflow superfine grinding is adopted, the particle size reaches 0.5-1 mu m, the performance index meets the standard of 'waste tire pyrolysis carbon black' HG/T5459-2018, part of indexes reach the standard of N330 carbon black, and the method can replace part of functional carbon black.

Drawings

Fig. 1 is a schematic structural view of a waste tire pyrolytic carbon circulating fluidized bed air flow pulverizer of the invention in a front view.

FIG. 2 is a schematic view of the arrangement structure of the section A-A of the waste tire pyrolytic carbon circulating fluidized bed air-flow pulverizer of the invention.

FIG. 3 is a schematic view of the arrangement of the section B-B of the waste tire pyrolytic carbon circulating fluidized bed air-jet pulverizer of the invention.

FIG. 4 is a schematic view of the arrangement structure of the section C-C of the waste tire pyrolytic carbon circulating fluidized bed air flow pulverizer of the invention.

Fig. 5 is a schematic diagram of a partial enlarged structure D of the pneumatic pulverizer for a waste tire pyrolytic carbon circulating fluidized bed according to the present invention.

Fig. 6 is a schematic diagram of a part E of the waste tire pyrolytic carbon circulating fluidized bed air flow pulverizer of the invention in an enlarged structure.

I-airflow pulverizer II-circulating fluidized bed material returning device

1-compression inert non-condensable gas nozzle 2-gas mixing cone 3-inlet surrounding shell 4-first-stage stationary blade grating

5-first-stage driving impeller 6-first-stage differential impeller 7-second-stage stationary blade cascade

8-second-stage driving impeller 9-second-stage differential impeller 10-working enclosure 11-turbofan 12-outlet enclosure 13-bearing box 14-driving shaft 15-circulating fluidized bed body

16-vibration bag filter 17-vertical pipe 18-U-shaped return bend 19-hood

20-a fluidizing plenum.

Detailed Description

The invention is further described with reference to the following detailed description of embodiments and drawings.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the waste tire pyrolytic carbon circulating fluidized bed air-jet pulverizer is characterized in that: comprises an airflow crusher I and a material returning device II of a circulating fluidized bed.

The airflow pulverizer I comprises a compressed inert non-condensable gas nozzle 1, a gas mixing cone 2, an inlet enclosure 3, a first-stage stationary blade grid 4, a first-stage driving impeller 5, a first-stage differential impeller 6, a second-stage stationary blade grid 7, a second-stage driving impeller 8, a second-stage differential impeller 9, a working enclosure 10, a turbine fan 11, an outlet enclosure 12, a bearing box 13 and a driving shaft 14, wherein pyrolytic carbon particles in a storage bin are poor in flowability, the compressed inert non-condensable gas needs to be dispersedly guided into the inlet enclosure 3, meanwhile, coarse pyrolytic carbon particles returned by a circulating fluidized bed return feeder II injected by the compressed inert non-condensable gas nozzle 1 are sprayed to the inlet enclosure 3 through the gas mixing cone 2 to be mixed with the pyrolytic carbon particles in the storage bin, the mixed gas flows through a flow channel of the inlet enclosure 3 and is uniformly distributed and splashed to the first-stage stationary blade grid 4, the first-stage stationary blade grid 4 is embedded and fastened in the working enclosure 10, and the mixed, the mixed gas flow is accelerated to supersonic speed, at the moment, the first-stage driving impeller 5 and the first-stage differential impeller 6 rotate at high speed under the drive of the driving shaft 14, the flow channel guides the airflow to repeatedly turn, continuously impact and compress and collide when the mixed airflow is pressurized by applying work, pyrolytic carbon particles collide with each other, rub and are sheared and crushed into ultrafine particles under the guidance of high-speed airflow, the difference between blade root airflow angles of a primary driving impeller 5 and a primary differential impeller 6 is 1-2 degrees, the consideration factors of keeping dynamic balance, reducing vibration of a driving shaft 14 and prolonging the service life of a bearing box 13 are considered except increasing the turning strength of the airflow, the primary driving impeller 5 and the primary differential impeller 6 are designed with through holes for the through flow of the mixed airflow, a secondary static blade grid 7, a secondary driving impeller 8 and a secondary differential impeller 9 have the same working principle, a turbofan 11 is designed in an outlet enclosure 12, and the mixed airflow is discharged to a return feeder II of a circulating fluidized bed.

The circulating fluidized bed material returning device II comprises a circulating fluidized bed body 15, a vibration type bag filter 16, a vertical pipe 17, a U-shaped material returning bent pipe 18, a blast cap 19 and a fluidized air chamber 20, wherein the circulating fluidized bed body 15 plays a role of uniform diffusion on input mixed air flow, after the mixed air flow enters the vibration type bag filter 16 through the circulating fluidized bed body 15, qualified superfine pyrolytic carbon particles are collected and returned to a bin after being filtered along with the mixed air flow, unqualified crude pyrolytic carbon particles fall into the vertical pipe 17 and are stacked to a certain height to form a material column, the static pressure formed by the crude pyrolytic carbon particle material column in the vertical pipe 7 drives the material column to be conveyed to the air mixing cone 2 through the U-shaped material returning bent pipe 18, the higher the stacking speed of the material column is, the balance of the storage and discharge rate of the crude pyrolytic carbon particles in the vertical pipe 17 is realized, the material column keeps a certain height and forms a material seal, and fluidized air led out from a branch at the side of the, and continuously conveys the coarse pyrolytic carbon particles to the gas mixing cone 2 through a U-shaped material returning bent pipe 18.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (6)

1. Waste tire pyrolytic carbon circulating fluidized bed air current rubbing crusher, characterized by: comprises an airflow crusher and a material returning device of a circulating fluidized bed; the airflow crusher comprises a compressed inert non-condensable gas nozzle, a gas mixing cone, an inlet enclosure, a first-stage stationary blade grid, a first-stage driving impeller, a first-stage differential impeller, a second-stage stationary blade grid, a second-stage driving impeller, a second-stage differential impeller, a working enclosure, a turbofan, an outlet enclosure, a bearing box and a driving shaft, wherein pyrolytic carbon particles in a storage bin are poor in flowability, the compressed inert non-condensable gas is required to be dispersedly guided into the inlet enclosure, meanwhile, coarse pyrolytic carbon particles returned by a circulating fluidized bed return feeder injected by the compressed inert non-condensable gas nozzle are injected into the inlet enclosure through the gas mixing cone to be mixed with the pyrolytic carbon particles in the storage bin, mixed gas flows through a guide of an inlet enclosure flow channel and is uniformly distributed and splashed to the first-stage stationary blade grid, the first-stage stationary blade grid is embedded and fastened in the working enclosure, the first-stage driving impeller and the first-stage differential impeller, The working principle of the second-stage differential impeller is the same as that of the first-stage differential impeller, a turbofan is designed in the outlet enclosure, and mixed air flow is discharged to a material returning device of the circulating fluidized bed; the circulating fluidized bed material returning device comprises a circulating fluidized bed body, a vibration bag filter, a vertical pipe, a U-shaped material returning bent pipe, a blast cap and a fluidizing air chamber, fluidizing air led out from the side branch of the outlet enclosure performs dispersion and fluidization on the coarse pyrolytic carbon particles through the fluidizing air chamber and the blast cap, and continuously conveys the coarse pyrolytic carbon particles to the gas mixing cone through the U-shaped material returning bent pipe.

2. The pneumatic pulverizer of a waste tire pyrolytic carbon circulating fluidized bed of claim 1, which is characterized in that: the inert tail gas is further cooled to normal temperature and is subjected to moisture removal to obtain inert noncondensable gas, the oxygen content is less than 3%, and the moisture content is less than 0.3g/m³The temperature is 20-25 ℃, the temperature of pyrolytic carbon discharged from the pyrolysis reaction furnace is 350-400 ℃, and inert non-condensable gas can be used as protective cooling working gas for pyrolytic carbon crushing and grinding.

3. The pneumatic pulverizer of a waste tire pyrolytic carbon circulating fluidized bed of claim 1, which is characterized in that: after the mixed airflow passes through the narrow throat of the first-stage stationary blade grid, the mixed airflow is accelerated to supersonic speed, at the moment, the first-stage driving impeller and the first-stage differential impeller rotate at high speed under the driving of the driving shaft, the mixed airflow is pressurized by applying work, meanwhile, a flow channel of the mixed airflow guides the airflow to repeatedly turn, continuously impact, compress and collide, and pyrolytic carbon particles collide, rub and shear into superfine particles under the guidance of the high-speed airflow.

4. The pneumatic pulverizer of a waste tire pyrolytic carbon circulating fluidized bed of claim 1, which is characterized in that: the difference of the blade root air flow attack angles of the first-stage driving impeller and the first-stage differential impeller is 1-2 degrees, and besides the increase of the turning strength of the air flow, the consideration is also to maintain the dynamic balance, reduce the vibration of the driving shaft and prolong the service life of the bearing box.

5. The pneumatic pulverizer of a waste tire pyrolytic carbon circulating fluidized bed of claim 1, which is characterized in that: the circulating fluidized bed body plays a role in diffusing and uniformly diffusing the input mixed air flow, and after the mixed air flow enters the vibrating bag filter through the circulating fluidized bed body, the qualified superfine pyrolytic carbon particles are collected and placed in a bin after being filtered along with the mixed air flow.

6. The pneumatic pulverizer of a waste tire pyrolytic carbon circulating fluidized bed of claim 1, which is characterized in that: unqualified thick pyrolytic carbon particle falls into and piles up the take the altitude in the riser and form the stock column, and the static pressure drive that thick pyrolytic carbon particle stock column formed in the riser is defeated through U type returning charge bent pipe and is being mixed the gas awl, and the stock column piles up that the speed that moves is higher more fast for thick pyrolytic carbon particle accomodates discharge amount both and realize balancing in the riser, and the stock column keeps the take the altitude and forms the material and seal.

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