CN219525564U - Pneumatic conveying cyclone discharging device - Google Patents

Abstract

The utility model relates to a pneumatic conveying cyclone discharging device, and belongs to the technical field of pneumatic conveying. In order to reduce the content of fine powder in finished materials after pneumatic conveying, the utility model is provided with a diversion structure in the upper blanking pipe, eliminates the rotation motion of air flow and materials, and avoids the phenomenon that the materials slide down along the wall surface due to pneumatic rotation. Then, the materials at the edge are gathered towards the middle area by utilizing the cone ring, and then are scattered in the main air flow of the air separation wind for multiple times, meanwhile, the air flow speed at the position of the cone ring is improved, the air separation effect is enhanced, the repeated screening is carried out through a plurality of cone rings, and the fine powder is continuously separated from the materials and is carried out by the ascending air flow; and the air regulating valve is regulated according to the content of the micro powder in the sampling to obtain the optimal air separation effect. The pneumatic conveying cyclone discharging device is simple and effective in structure, and investment and operation cost are saved.

Description

Pneumatic conveying cyclone discharging device

Technical Field

The utility model relates to a pneumatic conveying cyclone discharging device, and belongs to the technical field of pneumatic conveying.

Background

Pneumatic conveying, also called air conveying, is to utilize the energy of air flow to convey powder material in the air flow direction in a closed pipeline, and is one specific application of fluidization technology. The pneumatic conveying device has simple structure and convenient operation, can be used for conveying horizontally, vertically or obliquely, and can also be used for simultaneously carrying out physical operations such as heating, cooling, drying, air flow classification and the like or certain chemical operations in the conveying process. The pneumatic conveying is mainly characterized by large conveying capacity, long conveying distance and higher conveying speed; can be charged at one place and then discharged at a plurality of places, or can be charged at a plurality of places and then discharged at one place.

Among the procedures in the factory, a suction-type pneumatic conveying system or a low-pressure-type pneumatic conveying system is often adopted for carrying out short-distance conveying of powdery materials, and the pneumatic conveying system has the characteristics of complete sealing in conveying process, simple equipment, compact structure, small occupied area, flexible arrangement of conveying pipelines, easiness in automatic control and the like, so that the pneumatic conveying system is widely applied. The outlet of the pneumatic conveying pipeline is often subjected to gas-solid separation by a cyclone separator, materials are collected, the collected materials are discharged through a rotary discharge valve at the bottom of the cyclone separator, and tail gas is purified and then discharged through an exhaust system. As disclosed in chinese patent document CN 113251746A (application No. 202110648588.1), a drying system of an adipic acid fluidized bed device is disclosed, dust-containing gas discharged from the top of a fluidized bed body enters a cyclone dust collector of a dust removing system, the dust-containing gas firstly undergoes primary dust removal by the cyclone dust collector, adipic acid dry powder collected by the cyclone dust collector is discharged by a discharge valve of the cyclone dust collector, and the primary dust-removing gas is discharged from a top air outlet and enters a washing tower for secondary dust removal.

In the fermentation industry, generally, short-distance pneumatic conveying adopts continuous dilute phase conveying, the solid-gas ratio is less than 10, the wind speed in a conveying pipe is generally between 20 and 30m/s, and a cyclone separator is used for collecting materials. Because the pneumatic conveying speed of the particles is high, the particles collide and rub vigorously in the pneumatic conveying process, so that the content of fine powder in the product after pneumatic conveying is obviously increased, and the quality of the product is reduced. The fine powder also brings some trouble to the subsequent procedures of storage, packaging and the like, such as the reduction of service life and operation reliability of equipment caused by the adhesion of hygroscopic dust on mechanical and electronic components of the equipment, and sometimes causes hardening phenomenon in the transportation process of bagged products and dust emission problem in the application process of the products.

Due to the problems, mechanical conveying is sometimes selected to replace pneumatic conveying in order to avoid the increase of the content of the fine powder in the conveying process aiming at the easily broken crystal materials, so as to avoid the increase of the fine powder caused by pneumatic conveying; one possible approach to the handling of fines generated during pneumatic transport of amorphous material is to add a sizing screen to remove fines from the finished product prior to entry into the package, but this obviously increases equipment investment and operating and maintenance costs.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a pneumatic conveying cyclone discharging device.

The technical scheme of the utility model is as follows:

the pneumatic conveying cyclone discharging device comprises a cyclone material receiver, wherein a material receiver air inlet, a material receiver air outlet and a material receiver discharge port are formed in the cyclone material receiver; the fine powder wind power separation device comprises a discharging cone, a discharging pipe and a discharging combined pipe; the upper end of the blanking cone is connected with a discharge hole of the receiver, the lower end of the blanking cone is inserted into the blanking pipe, and the blanking cone is connected with the blanking pipe in a sealing way; the lower end of the discharging pipe is inserted into the upper end of the discharging combined pipe, the discharging pipe is in sealing connection with the discharging combined pipe, an annular channel is formed between the lower end of the discharging pipe and the upper end of the discharging combined pipe, an air separation wind inlet pipe is arranged on the discharging combined pipe, and the air separation wind inlet pipe is communicated with the annular channel and is positioned above the lower end of the discharging pipe; and a conical ring is arranged in the blanking pipe.

According to the utility model, preferably, a flow guiding structure is further arranged in the discharging pipe, and the flow guiding structure is positioned above the cone ring; the guide structure comprises a plurality of guide plates which are radially arranged by taking the central axis of the blanking pipe as the center.

Further preferably, the guide plates extend from the axis of the blanking pipe to the inner wall of the blanking pipe, and the guide plates are arranged in a cross or a m shape; or the guide plates extend from the inner wall of the blanking pipe to the axis of the blanking pipe, the inner ends of the guide plates are spaced from the axis of the blanking pipe, and a plurality of guide plates are uniformly distributed along the circumferential direction of the blanking pipe at intervals.

Further preferably, the height of the flow guiding structure is 0.25-2 times of the diameter of the discharging pipe.

Further preferably, the blanking pipe comprises an upper blanking pipe, a middle blanking pipe and a lower blanking pipe which are sequentially arranged from top to bottom, the flow guiding structure is arranged in the upper blanking pipe, and the cone ring is arranged in the middle blanking pipe and/or the lower blanking pipe.

According to the utility model, preferably, a plurality of cone rings are arranged, and the distance between two adjacent cone rings is 0.5-3 times of the diameter of the blanking pipe.

According to the utility model, the shape of the conical ring is in an inverted truncated cone shape, the cone angle of the conical ring is 60-150 degrees, the diameter of the cross section of the top of the conical ring is the same as the diameter of the blanking pipe, and the ratio of the cross section of the bottom of the conical ring to the cross section of the top of the conical ring is 0.5-0.8.

According to the utility model, the shape of the blanking cone is in an inverted truncated cone shape, and the ratio of the bottom sectional area to the top sectional area of the blanking cone is 0.5-0.8.

Further preferably, the cone angle of the discharging cone is the same as the cone angle of the discharge hole of the connected receiver.

According to the utility model, preferably, the air outlet of the receiver is connected with an exhaust pipeline; a bypass air outlet is arranged at the top of the blanking pipe and is connected with an exhaust pipeline through a bypass pipeline; the exhaust pipeline is provided with a second air regulating valve, and the second air regulating valve is arranged at the upstream of the connection position of the bypass pipeline and the exhaust pipeline.

Further preferably, a third air regulating valve is arranged on the bypass pipeline.

According to the utility model, the air-selecting air inlet pipe is provided with a first air regulating valve.

According to the utility model, preferably, a sampler is mounted on the discharging combined pipe, and the sampler is positioned below the discharging pipe.

According to the utility model, preferably, the discharging pipe and the discharging combined pipe are provided with observation mirrors.

According to the utility model, preferably, the lower part of the discharging combination pipe is connected with a cyclone discharging rotary valve.

The working principle of the device of the utility model is as follows:

in the device, a small amount of air is sucked from the air separation and inlet pipe by utilizing negative pressure generated by the air exhaust system of the cyclone collector, and for a particle material pneumatic conveying system, the sucked air amount is generally not more than 5-10% of the air inlet amount of the air inlet of the collector and enters the blanking pipe of the device from bottom to top. In the pneumatic conveying cyclone discharging device, on one hand, materials are led into a discharging pipe from a discharging hole of a material receiving device through a discharging cone, are in countercurrent contact with air flow flowing from bottom to top, small amounts of fine powder in the scattered and fallen materials are separated by using ascending air flow, and air flow with the fine powder is led into the cyclone material receiving device from the discharging cone, is converged into vortex air flow in the central area of the cyclone material receiving device, and is discharged by an exhaust system. On the other hand, a small amount of air entering the cyclone collector reduces the separation efficiency of the gas phase and the solid phase in the cyclone collector, and especially the influence on the separation efficiency of solid particles gradually increases along with the reduction of the particle size, namely, more fine powder is discharged through an air outlet of the cyclone collector, so that the proportion of the fine powder in the product is further reduced. Through the synergistic effect of the two, the device can effectively remove the fine powder generated in the pneumatic conveying process of the granular product.

In the cyclone material collector, the airflow is in a high-speed rotation state, the material is thrown to the wall surface under the centrifugal effect, and rotationally slides to the blanking cone along the wall surface from the material outlet of the material collector, and then is guided into the blanking pipe through the blanking cone; meanwhile, the airflow vortex can be downwards transmitted into the blanking pipe, the airflow vortex can continuously drive the materials to rotate, and the materials can be thrown to the wall surface of the blanking pipe under the action of centrifugal force and can slide downwards along the wall surface in a rotating mode. Therefore, the device is provided with the flow guiding structure in the blanking pipe, preferably the upper blanking pipe, so that the airflow vortex dissipates rapidly, the materials are prevented from gathering towards the wall surface due to the centrifugal effect, and meanwhile, the state that the materials slide down along the wall surface in a rotating way is broken.

After most of vortex airflow is broken by using the guide plate, materials on the wall surface are gathered towards the middle area by using the conical ring, and the gathered materials are scattered in an annular manner into the main airflow flow. The entrainment rate of the fines in the material is less than the rising rate of the gas stream, so that in sufficient contact of the falling material with the rising gas stream, the fines are continually separated from the material and carried out by the rising gas stream. In order to fully select the superfine powder, a plurality of cone rings can be arranged, so that materials dispersed to the edge are continuously gathered into the main airflow flow by the cone rings to participate in winnowing; the arrangement of the cone ring can improve the airflow velocity at the position of the cone ring, increase the disturbance of the airflow at the position of the cone ring and improve the fine powder selecting efficiency; in the flow channel between the conical ring and the conical ring, the air flow resumes the normal speed, the material with larger particle diameter brought out by the high-speed air flow at the conical ring is redeposited in the flow channel between the conical ring and the conical ring, and most of the fine powder is finally selected from the product, and the loss caused by bringing out the qualified product with finer particle diameter is avoided.

In this device, the air-separation wind air-supply line sets up in the upper portion of the annular channel that forms between unloading pipe and ejection of compact combination pipe, and the air-separation wind air-supply line is higher than the bottom of unloading pipe, and the air current that gets into from the air-separation wind air-supply line like this can be full of annular channel earlier, gets into the unloading pipe from the bottom of unloading pipe again, and annular channel plays even cloth wind effect. After the air flow is uniformly distributed in the annular channel, the air flow is turned into the blanking pipe from the bottom of the blanking pipe along the annular periphery to form a uniform initial flow field, and the air velocity of air separation wind is low, so that the initial air flow disturbance is avoided, and the air separation efficiency is improved, and the loss of fine-particle-size products is reduced.

In the device, the top of the blanking pipe can be also provided with a bypass air outlet, negative pressure is generated at the bypass air outlet, the negative pressure value of the negative pressure is slightly higher than that of the negative pressure at the outlet of the blanking cone, and the winnowing air flow with the fine powder can be partially or completely discharged from the bypass air outlet directly instead of leaking into the cyclone collector from the discharge hole of the collector, so that the separation efficiency of the winnowing air flow on the cyclone air flow in the cyclone collector is prevented from being reduced, and the device is more beneficial to the treatment of fine particle products.

In the device, the sampling range of the sampler comprises materials from the center to the edge of the blanking pipe, and the sampling result is ensured to represent the real particle size distribution of the materials, so that the air regulating valve can be finely regulated and controlled according to the content of the micro powder in the sampling, and the optimal air selecting effect is obtained. The device is characterized in that an observation mirror is further arranged on the discharging pipe and the discharging combined pipe, so that the purpose of observing the airflow and the material flow field in the material is to evaluate the situation of bringing the micro powder out.

The beneficial effects are that:

the fine powder wind power separation device is generally arranged below a discharge hole of a cyclone collector to form the pneumatic conveying cyclone discharging device, and is used for separating fine powder in pneumatic conveying materials. The working principle is that fine powder with very low entrainment speed in the scattered and fallen materials is selected by utilizing ascending airflow, so that the content of the fine powder in the finished product is reduced; the small amount of air leaking into the cyclone collector from the discharge hole of the collector also reduces the separation efficiency of the fine powder, and further reduces the content of the fine powder of the product at the discharge hole of the collector. Because this fine powder wind-force separator can be directly installed in original whirlwind receiver's discharge gate below, replace original unloading pipe or as a part of original unloading pipe, simplified the installation, saved the layout space, utilize exhaust system behind the whirlwind receiver to form the air separation wind's benefit and the regulation of whirlwind receiver air leakage volume of negative pressure completion, simple structure is effective. For the existing pneumatic conveying system, the screening process before packaging can be omitted, and the investment and the running cost are saved.

The fine powder wind power separation device can also be independently used as fine powder removing equipment for removing a small amount of fine powder from a product or applied to other occasions, such as a cloth bag dust remover, an inertial dust remover and the like, and is not limited by the description.

Drawings

FIG. 1 is a schematic diagram of a fine powder wind power separation device in example 1;

FIG. 2 is a schematic structural view of the pneumatic conveying cyclone discharging device in example 1;

FIG. 3 is a schematic cross-sectional view of a baffle of example 1;

FIG. 4 is a schematic view of the pneumatic conveying cyclone discharging apparatus in example 2;

fig. 5 is a schematic diagram of the structure of the bypass air outlet of the fine powder wind power separation device in embodiment 2.

FIG. 6 is a schematic view of the pneumatic conveying cyclone discharge apparatus in example 3.

In the figure, a 1-cyclone collector, a 1 a-collector air inlet, a 1 b-collector air outlet, a 1 c-collector discharge outlet, a 2-blanking cone, a 3-blanking pipe, a 3 a-upper blanking pipe, a 3 b-middle blanking pipe, a 3 c-lower blanking pipe, a 4-diversion structure, a 5-cone ring, a 6-sampler, a 7-air selection air inlet pipe, an 8-first air regulating valve, a 9-discharge combined pipe, a 10-cyclone discharge rotary valve, an 11-bypass air outlet, a 12-bypass pipeline, a 13-exhaust pipeline, a 14-second air regulating valve and a 15-third air regulating valve.

Detailed Description

The fine powder wind power separation device of the present utility model will be described in further detail with reference to examples and drawings, but the scope of the present utility model is not limited thereto.

Example 1:

the pneumatic conveying cyclone discharging device is of a vertically placed structure as shown in fig. 1 and 2, and comprises a cyclone collector 1, wherein a collector air inlet 1a, a collector air outlet 1b and a collector discharge outlet 1c are arranged on the cyclone collector 1; the fine powder wind power separating device is arranged below the material outlet 1c of the material receiving device, and the lower part of the fine powder wind power separating device is connected with the cyclone material discharging rotary valve 10.

The fine powder wind power separation device comprises a discharging cone 2, a discharging pipe 3 and a discharging combined pipe 9.

The upper end of the blanking cone 2 is connected with a material outlet 1c of the material receiving device, the lower end of the blanking cone 2 is inserted into the blanking tube 3, the blanking cone 2 is in sealing connection with the blanking tube 3, and the blanking cone 2 is used for guiding materials into the blanking tube 3.

The lower end of the discharging pipe 3 is inserted into the upper end of the discharging combined pipe 9, and the discharging pipe 3 is in sealing connection with the discharging combined pipe 9. An annular channel is formed between the lower end of the discharging pipe 3 and the upper end of the discharging combined pipe 9, an air-selecting air inlet pipe 7 is arranged on the discharging combined pipe 9, and the air-selecting air inlet pipe 7 is communicated with the annular channel and is positioned above the lower end of the discharging pipe 3. The structure ensures that the air-selecting wind inlet pipe 7 is higher than the bottom of the blanking pipe 3, and has the functions of enabling the air-selecting wind to fill the shape channel firstly and then evenly enter the blanking pipe 3 along the annular periphery from the bottom of the blanking pipe 3, and evenly distributing wind.

A conical ring 5 is arranged in the blanking pipe 3. The shape of the conical ring 5 is in an inverted truncated cone shape, the cone angle of the conical ring 5 is 100 degrees, the diameter of the top section of the conical ring 5 is the same as that of the blanking pipe 3, and the ratio of the bottom section area to the top section area of the conical ring 5 is 0.5. The cone ring 5 is used for concentrating materials at the edge of the blanking pipe to the middle area, and meanwhile, the airflow velocity at the position of the cone ring 5 is improved, so that the air separation effect is enhanced.

A group of flow guiding structures 4 are further arranged in the discharging pipe 3, and the flow guiding structures 4 are positioned above the cone ring 5; the guide structure 4 comprises a plurality of guide plates which are radially arranged by taking the central axis of the blanking pipe 3 as the center, the guide plates extend from the central axis of the blanking pipe 3 to the inner wall of the blanking pipe 3, and the guide plates are arranged in a cross or m shape; or, the guide plates extend from the inner wall of the blanking pipe 3 to the axis of the blanking pipe 3, the inner ends of the guide plates are spaced from the axis of the blanking pipe 3, a plurality of guide plates are uniformly distributed along the circumferential direction of the blanking pipe 3 at intervals, the section of each guide plate is shown in fig. 3, and the height of each guide structure 4 is 1.25 times of the diameter of the blanking pipe 3. The flow guiding structure can be a flow guiding plate with other shapes besides the flow guiding plate with the structure of the embodiment; or the multiple groups of flow guiding structures are arranged in series up and down according to actual conditions. The flow guiding structure 4 is used for eliminating the rotation movement of air flow and materials, so that the air flow vortex dissipates rapidly, the materials are prevented from gathering towards the wall surface due to the centrifugal effect, and meanwhile, the state that the materials slide down along the wall surface in a rotating way is broken.

The blanking pipe 3 comprises an upper blanking pipe 3a, a middle blanking pipe 3b and a lower blanking pipe 3c which are sequentially arranged from top to bottom, the flow guide structure 4 is arranged in the upper blanking pipe 3a, the cone rings 5 are arranged in the middle blanking pipe 3b and the lower blanking pipe 3c, the number of the cone rings 5 is five, and the distance between two adjacent cone rings 5 is 1.5 times the diameter of the blanking pipe 3. Besides the scheme of the embodiment, the number of the conical rings 5 in the blanking pipe 3 can be increased and reduced according to actual conditions, or the distance between two adjacent conical rings 5 can be adjusted.

The shape of the discharging cone 2 is an inverted circular truncated cone, and the cone angle of the discharging cone 2 is the same as the cone angle of the discharge hole 1c of the connected receiver. The material which falls down by the rotation of the discharge hole 1c of the cyclone collector falls into the discharging cone 2 with the same cone angle, so that the influence of the change of the cone angle on the separation efficiency of the cyclone collector is avoided.

The ratio of the bottom sectional area to the top sectional area of the discharging cone 2 is 0.5.

The air separation and inlet pipe 7 is provided with a first air regulating valve 8. The discharge combination pipe 9 is provided with a sampler 6, and the sampler 6 is positioned below the discharging pipe 3. The sampler 6 is used for sampling the discharge to evaluate the effect of air separation, and the sampling range comprises the material from the center to the edge of the discharging pipe 3, so that the sampling result represents the real particle size distribution of the material. Generally, the opening of the air regulating valve 8 can be adjusted under the condition of sampling by the sampler 6, so as to adjust the air inlet quantity of the air selecting air inlet pipe 7, and obtain the optimal air selecting effect.

And the upper blanking pipe 3 and the discharging combined pipe 9 are also provided with observation mirrors.

The lower part of the discharging combination pipe 9 is connected with a cyclone discharging rotary valve 10.

The fine powder wind power separation device of example 1 works as follows:

the materials discharged from the discharge hole 1c of the receiver are led into the discharging pipe 3 through the discharging cone 2, then enter the discharging pipe 3 and the discharging combined pipe 9 in sequence, and then are discharged into the finished product through the cyclone discharging rotary valve 10.

The negative pressure generated by the exhaust system of the cyclone collector 1 is utilized to suck air from the air separation wind inlet pipe 7, the air flow flows from bottom to top in the fine powder wind power separation device to generate reverse air flow opposite to the movement direction of the materials, small amount of fine powder in the scattered and dropped materials is separated by utilizing ascending air flow, and the air flow with the fine powder is introduced into the cyclone collector 1 from the collector discharge port 1c and is converged into vortex air flow in the central area of the cyclone collector 1, and is discharged by the exhaust system.

The airflow vortex formed by the cyclone collector is also downwards transmitted into the blanking pipe 3, and the diversion structure 4 in the upper blanking pipe 3a is utilized to block the rotating airflow and the material flow which falls down along the wall surface in a rotating way, so that the rotating movement of most of the airflow and the material is eliminated.

After the vortex airflow is broken by the diversion structure 4, the materials at the edge are gathered towards the middle area by the cone ring 5, meanwhile, the airflow velocity at the position of the cone ring 5 is increased, the air separation effect is enhanced, the materials are fully contacted with the ascending airflow, the diameter of fine powder is small, and the entrainment speed is smaller than the ascending speed of the airflow, so that the materials are continuously separated from the materials and are carried out by the ascending airflow.

The opening degree of the first air regulating valve 8 is adjusted under the condition of sampling by the sampler 6, so that the air inlet quantity of the air selecting air inlet pipe 7 is adjusted, and the optimal air selecting effect is obtained.

Example 1 working effect of pneumatic conveying cyclone discharge device:

the product particles from a low-content lysine granulating and drying device have the particle size range of 0.6-1.6 mm, wherein the proportion of fine particles less than 0.6mm and powder is about 2-4%, and the proportion of powder less than 0.25mm is about 0%. After passing through a pneumatic conveying pipeline of 60-150 m, the proportion of fine particles and powder less than 0.6mm is increased by 1-2% to about 3-6% at the cyclone discharging rotary valve of the cyclone collector in the prior art, wherein the proportion of powder less than 0.25mm is increased to about 0.5%. After the pneumatic conveying cyclone discharging device is adopted, fine particles smaller than 0.6mm and powder in a finished product at a cyclone discharging rotary valve are reduced by about 1.5% when the section wind speed in a discharging pipe is about 2m/s by adjusting the air selecting wind quantity, wherein the powder smaller than 0.25mm accounts for about 0%; if the flow guiding structure is removed, the proportion of fine particles smaller than 0.6mm and powder in the finished product is reduced by about 1.2%, and the proportion of powder smaller than 0.25mm is reduced by about 0.3%; if the diversion structure and the cone ring are removed at the same time, the proportion of fine particles smaller than 0.6mm and powder in the finished product is not more than 0.5% compared with that of the cyclone collector in the prior art under the same wind speed.

Example 2:

the pneumatic conveying cyclone discharging apparatus, as shown in fig. 4 and 5, is different from embodiment 1 in that: the top of the blanking pipe 3 is also provided with a bypass air outlet 11, the receiver air outlet 1b is connected with an air exhaust pipeline 13, the bypass air outlet 11 is connected with the air exhaust pipeline 13 through a bypass pipeline 12, the air exhaust pipeline 13 is provided with a second air regulating valve 14, and the second air regulating valve 14 is positioned at the upstream of the connection position of the bypass pipeline 12 and the air exhaust pipeline 13.

The second damper 14 is located at the upstream of the connection position of the bypass pipeline 12 and the exhaust pipeline 13, so that the resistance of the cyclone collector side between the discharging cone outlet and the exhaust pipeline can be increased to be larger than the resistance of the bypass pipeline side, the difference between the resistance of the cyclone collector side and the resistance of the bypass pipeline side is increased, and more winnowing air with fine powder is discharged through the bypass pipeline.

By adjusting the opening of the second air regulating valve 14, the air-selecting air inlet quantity entering the cyclone collector 1 from the material outlet 1c of the collector is regulated until the air-selecting proportion in the vortex ascending air flow in the central area of the cyclone feeder 1 is zero, and the separation efficiency of the cyclone collector 1 is properly improved until the original separation efficiency is reached, so that the loss of fine particle products possibly caused by the reduction of the separation efficiency is reduced.

Example 2 working effect of pneumatic conveying cyclone discharging device:

in the product from a 98.5% lysine crystal drying device, the 80 mesh undersize fine powder accounts for about 4% -6%, the average grain size of the undersize fine powder is about 110 mesh, after the undersize fine powder passes through a pneumatic conveying pipeline of 60-100 m, for a cyclone collector in the prior art, the cyclone discharging rotary valve of the cyclone collector is provided with the fine powder accounting for 6% -8%, the average grain size of the fine powder is still about 110 mesh, in this case, the added fine powder in the pneumatic conveying process is equivalent to the fine powder grain size in the product, and the total fine powder content is close to or reaches the product internal control index of 8%. By properly closing the second air regulating valve 14, the air quantity of the air-selecting air directly entering the cyclone collector 1 through the discharge hole 1c of the collector is zero (the flowing direction of the air flow can be observed through an observation mirror), all the air-selecting air is discharged from the bypass air outlet 11, and the air quantity of the air-selecting air is regulated by regulating the first air regulating valve 8, when the air speed of the section of the discharging pipe is about 1.5m/s, the proportion of fine powder in the finished product is reduced to 4-6%, the average particle size of the fine powder under the screen is increased to about 90-100 meshes, and the removal efficiency of finer fine powder is improved.

Example 3

The pneumatic conveying cyclone discharging apparatus, as shown in fig. 6, is different from embodiment 2 in that: the bypass pipeline 12 is also provided with a third air regulating valve 15.

By the combined application of the first air regulating valve 8, the second air regulating valve 14 and the third air regulating valve 15, the wide-range and stable and flexible air quantity regulation under more complex working conditions can be realized, the air quantity regulation of the air selection from the cyclone air collector 1 from the air collector discharge port 1c to the wide-range of the small amount of pneumatic air supply and air discharge from the air collector discharge port 1c into the bypass air outlet 11 is realized, and the air quantity regulation of the air selection exceeding the upper limit of the air supply quantity of the air selection (generally not exceeding 5-10% of the air supply quantity of the air inlet of the air collector) of the embodiment 1 is further realized. The combined use of the first damper 8, the second damper 14 and the third damper 15 has the advantages that: the realization that air selection wind enters the cyclone collector 1 from the collector discharge hole 1c to a small amount of pneumatic air conveying wind is discharged from the collector discharge hole 1c and enters the bypass air outlet 11 can slightly reduce the separation efficiency of the cyclone collector 1 on fine powder to slightly improve; when the air inlet quantity of the air separation wind is not limited, the efficiency of the fine powder wind power separation device for removing the fine powder can be further improved, and the fine powder can be removed from products with wider particle size distribution and finer particle size by combining the air separation wind and the fine powder wind power separation device.

Specific adjustment methods are illustrated by way of example, but not limitation:

1. for the case that the negative pressure generated by the exhaust system of the cyclone collector is large, the setting and adjusting method of the air adjusting valve can be as follows: under the condition that the first air regulating valve 8 is closed, firstly, the opening degrees of the second air regulating valve 14 and the third air regulating valve 15 are regulated to a certain value, the total resistance coefficient of the pipelines where the second air regulating valve 14 and the third air regulating valve are positioned is kept at a specific proportion, the negative pressure at the discharge port of the receiver is in a required normal negative pressure state, and the air quantity discharged from the bypass pipeline 12 and the air exhaust pipeline 13 is kept at a certain proportion; then the first air regulating valve 8 is gradually opened, and the fixed distribution relation between the bypass pipeline 12 and the exhaust pipeline 13 enables the air quantity of pneumatic conveying air leaked from the cyclone collector 1 and flowing to the bypass air outlet 11 to be gradually reduced, so that the separation yield of gas phase and solid phase in the cyclone collector 1 is gradually reduced; when the pneumatic air quantity of the air conveyed and blown out of the cyclone collector 1 is zero, the cyclone collector 1 achieves the original separation yield, and meanwhile, a certain amount of air quantity of air selected is obtained; with the opening of the first air regulating valve 8 continuously increasing, the air selecting air quantity leaked into the cyclone collector 1 gradually increases, and the separation efficiency of the cyclone collector 1 gradually decreases until reaching the allowable range, and the maximum air selecting air quantity is obtained at the moment and is larger than the air leakage quantity allowed by the common cyclone collector.

The negative pressure at the air-selecting air inlet pipe 7 can be changed by adjusting the opening degrees of the second air regulating valve 14 and the third air regulating valve 15, so that the air quantity adjusting range and the corresponding sensitivity degree of the first air regulating valve 8 are changed; meanwhile, the proportion relation between the opening degree of the second air regulating valve 14 and the proportion relation between the opening degree of the third air regulating valve 15 and the proportion relation between the total resistance coefficient of the two pipelines, namely the proportion relation between the air quantity passing through the bypass pipeline 12 and the air exhaust pipeline 13 can be regulated, so that the proportion relation between the air quantity of pneumatic air conveying leaked from the discharge hole 1c of the cyclone collector or the air quantity of air selecting air leaked into the cyclone collector 1 and the total air quantity of air selecting air is regulated, the relation between the separation efficiency of the cyclone collector 1 and the fine powder removing efficiency of the fine powder wind power separation device is changed, and the two are combined, and the optimal fine powder removing efficiency is finally obtained through limited sampling detection and the adjustment of the three air regulating valves.

2. For the case of larger negative pressure generated by the exhaust system of the cyclone collector, the setting and adjusting method of the air adjusting valve can also be as follows: under the condition that the third air regulating valve 15 is closed, the second air regulating valve 14 is regulated to a certain opening degree, so that the negative pressure at the discharge hole of the receiver is in a required normal negative pressure state, and then the first air regulating valve 8 is opened to a certain opening degree, so that a preliminary proper air-selecting wind speed is obtained, and the air-selecting wind speed can exceed the allowable air leakage upper limit of a general cyclone receiver; then the third air regulating valve 15 is gradually opened, the air quantity discharged from the bypass air outlet 11 of the air selecting wind is gradually increased, namely the air quantity of the air selecting wind leaked into the cyclone collector 1 is gradually reduced, the separation efficiency of the cyclone collector is gradually improved, and the best fine powder removing efficiency is finally obtained through limited sampling detection and adjustment of the three air regulating valves.

In the above (but not limited to the above) adjusting method, the method has better adaptability to the condition of higher negative pressure and the condition of fluctuation of the negative pressure generated by the exhaust system of the air receiver, and has better adaptability to the condition of changing the resistance characteristic of the pipeline in the production process.

Claims (10)

1. The pneumatic conveying cyclone discharging device is characterized by comprising a cyclone collector (1), wherein a collector air inlet (1 a), a collector air outlet (1 b) and a collector discharging port (1 c) are arranged on the cyclone collector (1); the fine powder wind power separation device comprises a discharging cone (2), a discharging pipe (3) and a discharging combined pipe (9); the upper end of the blanking cone (2) is connected with a discharge hole (1 c) of the receiver, the lower end of the blanking cone (2) is inserted into a blanking pipe (3), and the blanking cone (2) is connected with the blanking pipe (3) in a sealing way; the lower end of the discharging pipe (3) is inserted into the upper end of the discharging combined pipe (9), the discharging pipe (3) is in sealing connection with the discharging combined pipe (9), an annular channel is formed between the lower end of the discharging pipe (3) and the upper end of the discharging combined pipe (9), an air-separation air inlet pipe (7) is arranged on the discharging combined pipe (9), and the air-separation air inlet pipe (7) is communicated with the annular channel and is positioned above the lower end of the discharging pipe (3); a conical ring (5) is arranged in the blanking pipe (3); and a sampler (6) is arranged on the discharging combined pipe (9), and the sampler (6) is positioned below the discharging pipe (3).

2. A pneumatic conveying cyclone unloading device as claimed in claim 1, wherein a flow guiding structure (4) is further arranged in the unloading pipe (3), and the flow guiding structure (4) is positioned above the cone ring (5); the flow guiding structure (4) comprises a plurality of flow guiding plates which are radially arranged by taking the central axis of the blanking pipe (3) as the center; the height of the flow guiding structure (4) is 0.25-2 times of the diameter of the discharging pipe (3).

3. A pneumatic conveying cyclone unloading device as claimed in claim 2, wherein the guide plates extend from the axis of the blanking pipe (3) to the inner wall of the blanking pipe (3), and a plurality of the guide plates are arranged in a cross shape or a m shape; or, the guide plates extend from the inner wall of the blanking pipe (3) to the axis of the blanking pipe (3), the inner ends of the guide plates are spaced from the axis of the blanking pipe (3), and a plurality of guide plates are uniformly distributed along the circumferential direction of the blanking pipe (3) at intervals.

4. Pneumatic conveying cyclone discharge device according to claim 2, characterized in that the discharge pipe (3) comprises an upper discharge pipe (3 a), a middle discharge pipe (3 b) and a lower discharge pipe (3 c) which are sequentially arranged from top to bottom, the flow guiding structure (4) is arranged in the upper discharge pipe (3 a), and the cone ring (5) is arranged in the middle discharge pipe (3 b) and/or the lower discharge pipe (3 c).

5. A pneumatic conveying cyclone discharge device as claimed in claim 1 or 4, wherein a plurality of cone rings (5) are provided, and the distance between two adjacent cone rings (5) is 0.5-3 times the diameter of the discharge pipe (3).

6. A pneumatic conveying cyclone discharging device as claimed in claim 1, wherein the conical ring (5) is in an inverted truncated cone shape, the cone angle of the conical ring (5) is 60-150 degrees, the diameter of the top section of the conical ring (5) is the same as the diameter of the discharging pipe (3), and the ratio of the bottom section area to the top section area of the conical ring (5) is 0.5-0.8.

7. Pneumatic conveying cyclone unloading device according to claim 1, characterized in that the shape of the blanking cone (2) is in an inverted truncated cone shape, and the cone angle of the blanking cone (2) is the same as the cone angle of the connected receiver discharge port (1 c); the ratio of the bottom sectional area to the top sectional area of the blanking cone (2) is 0.5-0.8.

8. A pneumatic conveying cyclone unloading device as claimed in claim 1, wherein the material receiving outlet (1 b) is connected with an exhaust pipeline (13), a second air regulating valve (14) is arranged on the exhaust pipeline (13), and the second air regulating valve (14) is positioned at the upstream of the connection position of the bypass pipeline (12) and the exhaust pipeline (13); the top of the blanking pipe (3) is provided with a bypass air outlet (11), and the bypass air outlet (11) is connected with an exhaust pipe (13) through a bypass pipe (12).

9. A pneumatic conveying cyclone discharge device as claimed in claim 8, characterized in that the bypass duct (12) is provided with a third damper (15).

10. A pneumatic conveying cyclone discharge device as claimed in claim 1, wherein the air-selecting air inlet pipe (7) is provided with a first air regulating valve (8); the lower part of the discharging combined pipe (9) is connected with a cyclone discharging rotary valve (10).