Bulk high-calcium ash powder dedusting device

Abstract

The application provides a bulk high-calcium ash powder dedusting device, and relates to the technical field of industry.The device comprises a cylindrical shell and a dedusting and filtering unit;the bottom of the cylindrical shell is provided with a material collecting bin, the lateral wall of the cylindrical shell is provided with a feeding port, and the dedusting and filtering unit is installed on the top of the cylindrical shell;the dedusting and filtering unit comprises a plate body and a plurality of dedusting assemblies;the plate body blocks the upper port of the cylindrical shell, the plate body is provided with a plurality of through holes, the plurality of dedusting assemblies are respectively arranged in the plurality of through holes, the dedusting assembly comprises a back flushing pipe, an annular insulating sheet, a carbon fiber filter layer in the shape of a cylinder and a conductive fiber filter layer in the shape of a cylinder, one end of the carbon fiber filter layer is installed on the outer edge of the annular insulating sheet, one end of the conductive fiber filter layer is installed on the inner edge of the annular insulating sheet, and the ends of the carbon fiber filter layer and the conductive fiber filter layer, which are away from the annular insulating sheet, are blocked by a circular insulating sheet.The application can avoid the carbon fiber filter layer from being blocked, thereby realizing efficient dedusting.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural technology, in particular to a bulk high-calcium lime powder dust removal device. BACKGROUND

[0002] Bulk high-calcium lime powder is prone to generate a large amount of dust (particle size 0.5-10 μm, humidity ≤10% RH) during storage, transportation and handling. The removal rate of traditional cyclone dust collectors for dust with a particle size of less than 5 μm is only 80%, and although bag dust collectors can reach 99%, there are problems such as filter bag blockage. The strong alkalinity (pH value 12-14) and high humidity environment of high-calcium lime powder further aggravate equipment corrosion, resulting in a high failure rate of 15% / year for existing dust removal devices. SUMMARY

[0003] The present application provides a bulk high-calcium lime powder dust removal device, which can efficiently remove dust. The technical scheme of the present application is as follows:

[0004] A bulk high-calcium lime powder dust removal device, comprising a cylindrical shell and a dust removal and filtration unit;

[0005] A material collecting bin is installed at the bottom of the cylindrical shell, a feed inlet is formed in the side wall of the cylindrical shell, and the dust removal and filtration unit is installed at the top of the cylindrical shell;

[0006] The dust removal and filtration unit comprises a plate body and a plurality of dust removal assemblies, the plate body blocks the upper port of the cylindrical shell, a plurality of through holes are formed in the plate body, a plurality of dust removal assemblies are respectively arranged in the through holes, the dust removal assembly comprises a backflushing pipe, an annular insulating sheet, a carbon fiber filter layer in the shape of a cylinder, and a conductive fiber filter layer in the shape of a cylinder, one end of the carbon fiber filter layer is installed at the outer edge of the annular insulating sheet, one end of the conductive fiber filter layer is installed at the inner edge of the annular insulating sheet, the other ends of the carbon fiber filter layer and the conductive fiber filter layer away from the annular insulating sheet are blocked by a circular insulating sheet, the conductive fiber filter layer is grounded through a wire, and the backflushing pipe is arranged in the interior of the conductive fiber filter layer through the annular insulating sheet.

[0007] Preferably, a plurality of insulating baffles are distributed along the axis of the carbon fiber filter layer, the insulating baffles divide the carbon fiber filter layer along the axis into a plurality of mutually non-conductive sub-conductors, the backflushing pipe is connected with an air pump, the bottom of the backflushing pipe is blocked, a plurality of air outlets are annularly distributed on the side wall of the backflushing pipe close to the bottom of the backflushing pipe, and the backflushing pipe is connected with a driving device for driving the backflushing pipe to move up and down in the interior of the conductive fiber filter layer.

[0008] Preferably, a plurality of nozzles are arranged around the positions of the through holes in the plate body, and the nozzles are used to apply a pulse air flow along the axis of the carbon fiber filter layer through an air pump with a pulse valve.

[0009] Preferably, the conductive fiber filter layer comprises a carbon fiber layer and an ePTFE film arranged in a stack, wherein the carbon fiber layer is located close to one side of the carbon fiber filter layer.

[0010] Preferably, the gas blown out of the air outlet hole of the backflush pipe is a dry hot gas flow.

[0011] Preferably, the feed inlet is connected with a pretreatment channel, the pretreatment channel is wrapped with a cooling pipe outside, and cold water is circulated in the cooling pipe, the temperature of the cold water being lower than that of the dry hot gas flow.

[0012] Preferably, the pretreatment channel is internally laid with porous ceramics.

[0013] Preferably, the inner wall of the cylindrical shell is plated with an anti-corrosion coating.

[0014] Preferably, the pore size of the carbon fiber filter layer is smaller than that of the conductive fiber filter layer.

[0015] Preferably, the cylindrical shell is internally installed with a temperature sensor and a humidity sensor.

[0016] Compared with the prior art, the present application has at least the following beneficial effects:

[0017] By adopting the design of the double-layer filter layer formed by the carbon fiber filter layer and the conductive fiber filter layer and the backflush of the backflush pipe, in the dust removal process of the device, due to the high wear resistance and conductivity of the external carbon fiber filter layer, the impact and friction between the carbon fiber filter layer and the ash particles can generate static electricity on the carbon fiber filter layer, so that the electric charge is uniformly distributed on the surface of the carbon fiber filter layer to form an electrostatic field, which can adsorb very small fine particles on the surface of the carbon fiber filter layer, on the one hand, increasing the ability of the carbon fiber filter layer to adsorb fine particles, on the other hand, the adsorbed particles remain in the adsorbed state by the electrostatic force, thereby forming a particle layer that can be removed by conduction, on this basis, by sequentially arranging the conductive fiber filter layer and the backflush pipe inside the carbon fiber filter layer, the backflush pipe can blow the elastic conductive fiber filter layer to make it contact with the carbon fiber filter layer, on the one hand, releasing the accumulated electric charge of the carbon fiber filter layer, making the particle layer shed the enriched particles outside, on the other hand, the backflush pipe applies an air flow from the inside to the outside, which can also prevent the fine particles from blocking the carbon fiber filter layer, thereby avoiding the carbon fiber filter layer from being blocked by dust, avoiding the device from being blocked, and further realizing efficient dust removal. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0019] Fig. 1 Figure 1 is a structural schematic diagram of a bulk high-calcium ash powder dust removal device provided by an embodiment of the present application.

[0020] Fig. 2 Figure 2 is a structural schematic diagram of a dust removal assembly in the embodiment of the present application.

[0021] Fig. 3 Figure 3 is a structural schematic diagram of a carbon fiber filter layer in the embodiment of the present application.

[0022] In the figure:

[0023] 1 - cylindrical shell;

[0024] 11 - material collecting bin;

[0025] 2 - dust removal filter unit;

[0026] 21 - plate body;

[0027] 22 - back flushing pipe;

[0028] 23 - annular insulating sheet;

[0029] 24 - carbon fiber filter layer;

[0030] 25 - conductive fiber filter layer;

[0031] 26 - circular insulating sheet;

[0032] 27 - insulating baffle;

[0033] 3 - driving device;

[0034] 4 - pretreatment channel. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0036] As Figs. 1 to 3The embodiment shown provides a bulk high-calcium ash powder dust removal device, which comprises a cylindrical shell 1 and a dust removal and filtration unit 2.

[0037] A material collecting bin 11 is mounted at the bottom of the cylindrical shell 1, a feeding port is formed in the sidewall of the cylindrical shell 1, and the dust removal and filtration unit 2 is mounted at the top of the cylindrical shell 1.

[0038] The dust removal and filtration unit 2 comprises a plate body 21 and a plurality of dust removal assemblies, the plate body 21 blocks the upper port of the cylindrical shell 1, a plurality of through holes are formed in the plate body 21, and the plurality of dust removal assemblies are respectively arranged in the through holes, the dust removal assembly comprises a back flushing pipe 22, an annular insulating sheet 23, a carbon fiber filter layer 24 in the shape of a cylinder, and a conductive fiber filter layer 25 in the shape of a cylinder, one end of the carbon fiber filter layer 24 is mounted at the outer edge of the annular insulating sheet 23, one end of the conductive fiber filter layer 25 is mounted at the inner edge of the annular insulating sheet 23, the other ends of the carbon fiber filter layer 24 and the conductive fiber filter layer 25 away from the annular insulating sheet 23 are blocked by a circular insulating sheet 26, the conductive fiber filter layer 25 is grounded through a wire, and the back flushing pipe 22 penetrates into the interior of the conductive fiber filter layer 25 through the annular insulating sheet 23.

[0039] In the embodiment, in view of the corrosiveness of high-calcium ash powder, a fiber material is used as the filter layer, which has high corrosion resistance. In addition, in order to avoid dust from blocking the filter holes, a double-layer filter layer (the carbon fiber filter layer 24 and the conductive fiber filter layer 25) plus the back flushing pipe 22 is adopted. Specifically, the outer carbon fiber filter layer 24 has high wear resistance and conductivity, and the impact and friction between the carbon fiber filter layer 24 and ash particles during the dust removal process can generate static electricity on the carbon fiber filter layer 24. Since the carbon fiber material is a conductive material, the electric charge can be uniformly distributed on the fiber surface to form a static electric field, which can adsorb very small fine particles on the surface of the carbon fiber filter layer 24. On the one hand, this increases the ability of the carbon fiber filter layer 24 to adsorb fine particles, and on the other hand, the adsorbed particles remain in the adsorbed state by the electrostatic force. Once the static electricity is lost, the particles will fall off, and in turn, the sticky particles outside the particles that may be generated due to a small amount of water vapor will also fall off. That is, the fine particles will preferentially adhere to the surface of the carbon fiber filter layer 24 due to their small weight, forming a layer of particles that can be removed by conduction. In order to remove the particle layer, the carbon fiber filter layer 24 needs to be conductive, so the conductive fiber filter layer 25 is arranged inside the carbon fiber filter layer 24, and the back flushing pipe 22 is arranged inside the conductive fiber filter layer 25. The back flushing pipe 22 can blow the elastic conductive fiber filter layer 25 to make it contact with the carbon fiber filter layer 24, which can release the accumulated electric charge of the carbon fiber filter layer 24, so that the particle layer carries the enriched particles outside it to fall off. On the other hand, the back flushing pipe 22 applies an air flow from the inside to the outside, which can also prevent the fine particles from blocking the carbon fiber filter layer 24.

[0040] Of course, in order to increase corrosion resistance, the inner wall of the cylindrical shell 1 can also be coated with a corrosion-resistant coating.

[0041] In some embodiments of the present application, the carbon fiber filter layer 24 is distributed with a plurality of insulating baffles 27 along its axis, the insulating baffles 27 divide the carbon fiber filter layer 24 along the axis into a plurality of mutually non-conductive sub-conductors, the back blowing pipe 22 is connected with a gas pump, the bottom of the back blowing pipe 22 is blocked, a plurality of gas outlets are annularly distributed on the side wall of the back blowing pipe 22 near the bottom, the back blowing pipe 22 is connected with a driving device 3, and the driving device 3 is used to drive the back blowing pipe 22 to move up and down inside the conductive fiber filter layer 25.

[0042] In this embodiment, in order to better accumulate electric charge, a plurality of insulating baffles 27 are arranged to divide the carbon fiber filter layer 24 into a plurality of mutually insulated sub-conductors, the back blowing pipe 22 is continuously moved along the axis under the action of the driving device 3, and the conductive fiber filter layer 25 and the plurality of mutually insulated sub-conductors at different positions are sequentially contacted and discharged under the action of the gas pump, so that each sub-conductor has sufficient time to generate electric charge.

[0043] In this embodiment, the insulating baffles 27 can be short columns, and the carbon fiber material at the upper and lower ends of the carbon fiber filter layer 24 can be respectively pasted on the inner wall and the outer wall of the insulating baffles 27 to realize the insulation function.

[0044] In some embodiments of the present application, a plurality of nozzles are provided around the position of the through hole of the plate body 21, and the nozzles apply pulsed gas flow along the axis of the carbon fiber filter layer 24 through a gas pump with a pulse valve.

[0045] In this embodiment, in order to increase the efficiency of static electricity accumulation, pulsed gas can be applied along the axis of the carbon fiber filter layer 24, which can increase the friction efficiency between air, dust particles and the carbon fiber filter layer 24, increase the speed of static electricity accumulation, and also cooperate with the back blowing pipe 22 to remove dust on the surface of the carbon fiber filter layer 24.

[0046] In some embodiments of the present application, the conductive fiber filter layer 25 comprises a carbon fiber layer and an ePTFE film arranged in a stack, wherein the carbon fiber layer is located on one side close to the carbon fiber filter layer 24.

[0047] In the present embodiment, in order to make the gas blown by the blowback pipe 22 to drive the conductive fiber filter layer 25 to contact the carbon fiber filter layer 24 sufficiently, an ePTFE film with excellent elasticity can be selected as the main body, and a thin layer of carbon fiber layer is arranged on one side of the ePTFE film, so that the conductive fiber filter layer 25 with both elasticity and conductivity can be obtained. Of course, the ePTFE film can also be modified to have conductivity, for example, carbon nanotubes and carbon black conductive fillers can be added during the preparation of the ePTFE film.

[0048] In some embodiments of the present application, the gas blown by the gas outlet of the blowback pipe 22 is a dry hot gas flow.

[0049] In the present embodiment, the dry hot gas flow blown by the blowback pipe 22 can not only provide pneumatic force, but also increase the temperature near the carbon fiber filter layer 24 and the conductive fiber filter layer 25, so that the water vapor entering the device with the ash powder will not condense and finally be discharged from the device in the form of gas.

[0050] In some embodiments of the present application, the feed inlet is connected with a pretreatment channel 4, and the pretreatment channel 4 is wrapped with a cooling pipe outside, and cold water is circulated in the cooling pipe, and the temperature of the cold water is lower than that of the dry hot gas flow.

[0051] In the present embodiment, the pretreatment channel 4 can cool the gas entering the device, so that the gas encounters high temperature after entering the device, so that the water vapor will not condense into liquid, further preventing the carbon fiber filter layer 24 from being blocked.

[0052] In some embodiments of the present application, the pretreatment channel 4 is internally laid with porous ceramics.

[0053] In the present embodiment, the porous ceramics can absorb the water that is liquefied by coldness in the pretreatment channel 4, and has corrosion resistance.

[0054] In some embodiments of the present application, the pore size of the carbon fiber filter layer 24 is smaller than that of the conductive fiber filter layer 25, so as to improve the dust removal rate through multi-stage filtration.

[0055] In some embodiments of the present application, the cylindrical shell 1 is internally installed with a temperature sensor and a humidity sensor. The temperature sensor and the humidity sensor can monitor the environment in the device, and both too low temperature and too high humidity will increase the probability of dust blocking the filter holes. In addition, too high humidity will also affect the accumulation of static electricity.

[0056] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A dust removal device for bulk high-calcium ash powder, characterized in that, It includes a cylindrical housing (1) and a dust removal and filtration unit (2); The bottom of the cylindrical shell (1) is equipped with a material collection bin (11), the side wall of the cylindrical shell (1) is provided with a material inlet, and the dust removal and filtration unit (2) is installed on the top of the cylindrical shell (1); The dust removal and filtration unit (2) includes a plate (21) and multiple dust removal components. The plate (21) seals the upper port of the cylindrical shell (1). Multiple through holes are provided on the plate (21). Multiple dust removal components are respectively installed in the multiple through holes. The dust removal components include a backflush pipe (22), an annular insulating sheet (23), a cylindrical carbon fiber filter layer (24), and a cylindrical conductive fiber filter layer (25). One end of the carbon fiber filter layer (24) is installed on the outer edge of the annular insulating sheet (23), and one end of the conductive fiber filter layer (25) is installed on the inner edge of the annular insulating sheet (23). The ends of the carbon fiber filter layer (24) and the conductive fiber filter layer (25) away from the annular insulating sheet (23) are sealed by a circular insulating sheet (26). The conductive fiber filter layer (25) is grounded by a wire. The backflush pipe (22) passes through the annular insulating sheet (23) and enters the interior of the conductive fiber filter layer (25).

2. The dust removal device for bulk high-calcium ash powder according to claim 1, characterized in that, The carbon fiber filter layer (24) has multiple insulating baffles (27) distributed along its axis. The insulating baffles (27) divide the carbon fiber filter layer (24) into multiple non-conductive sub-conductors along the axis. The backflush pipe (22) is connected to an air pump. The bottom of the backflush pipe (22) is sealed. The backflush pipe (22) has multiple air outlets distributed in a ring on the side wall near its bottom. The backflush pipe (22) is connected to a driving device (3). The driving device (3) is used to drive the backflush pipe (22) to move up and down inside the conductive fiber filter layer (25).

3. A dust removal device for bulk high-calcium ash powder according to claim 1 or 2, characterized in that, The plate (21) is provided with a plurality of nozzles around the through hole, and the nozzles apply a pulsed airflow along its axis to the carbon fiber filter layer (24) by an air pump with a pulse valve.

4. The dust removal device for bulk high-calcium ash powder according to claim 1, characterized in that, The conductive fiber filter layer (25) includes a carbon fiber layer and an ePTFE membrane stacked together, wherein the carbon fiber layer is located on the side close to the carbon fiber filter layer (24).

5. A dust removal device for bulk high-calcium ash powder according to claim 2, characterized in that, The gas blown out of the air outlet of the backflush pipe (22) is a dry hot gas flow.

6. The dust removal device for bulk high-calcium ash powder according to claim 5, characterized in that, The feed inlet is connected to a pretreatment channel (4), and the pretreatment channel (4) is wrapped with a cooling pipe. Cold water circulates in the cooling pipe, and the temperature of the cold water is lower than that of the drying hot air flow.

7. A dust removal device for bulk high-calcium ash powder according to claim 6, characterized in that, The pretreatment channel (4) is lined with porous ceramic.

8. The dust removal device for bulk high-calcium ash powder according to claim 1, characterized in that, The inner wall of the cylindrical shell (1) is coated with an anti-corrosion coating.

9. A dust removal device for bulk high-calcium ash powder according to claim 1, characterized in that, The pore size of the carbon fiber filter layer (24) is smaller than that of the conductive fiber filter layer (25).

10. A dust removal device for bulk high-calcium ash powder according to claim 1, characterized in that, A temperature sensor and a humidity sensor are installed inside the cylindrical housing (1).

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