Briquette pre-dust removal system and briquette pre-dust removal method

Abstract

The present application provides a briquette pre-dust removal system and a briquette pre-dust removal method, which are used for modifying the briquette before the oxidation and carbonization processes, removing the coal dust on the surface of the briquette, and recycling the coal dust. The briquette pre-dust removal system comprises a gravity-free stirring device, a first separator and a second separator. The first separator has a first separation cavity, a first separation inlet, a first separation outlet and a first coal dust outlet, which are in communication with the first separation cavity. The second separator has a second separation cavity, a second separation inlet and a second separation outlet, which are in communication with the second separation cavity. The present application solves the problem that the existing briquette crushing material has a high dust removal rate during the carbonization process, and the fallen coal dust cannot be recycled.

Description

Technical Field

[0001] This invention relates to the field of coal powder processing and molding technology, and more specifically, to a coal briquette pre-de-pulverization system and a de-pulverization method for the coal briquette pre-de-pulverization system. Background Technology

[0002] In the production process of activated carbon, coal powder is first processed into briquettes with a strength greater than 90% by adding binders or by non-binding briquetting technology. The briquettes are then processed through oxidation, carbonization and activation to produce the desired product.

[0003] The briquettes prepared using existing coal powder forming technology have irregular shapes and many edges and corners, making their surfaces relatively fragile. This results in a high de-powdering rate during the oxygen and carbonization process. However, the coal powder produced during carbonization has almost no binding properties, making it difficult to re-press into briquettes and unable to be recycled. It can only be sold at a low price, which greatly affects the yield of carbonized material. This leads to a series of chain reactions, such as a decrease in the yield of the final product, an increase in production costs, an increase in product prices, and a weakening of market competitiveness. Summary of the Invention

[0004] The main objective of this invention is to provide a briquette pre-de-pulverization system and a briquette pre-de-pulverization method to solve the problem that the briquette crushed material has a high de-pulverization rate during the carbonization process and the detached coal powder cannot be recycled in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a briquette pre-de-pulverization system is provided for modifying briquettes before oxidation and carbonization processes to remove coal powder from the surface of the briquettes and recycle the coal powder. The briquette pre-de-pulverization system includes a gravity-free stirring device, a first separator, and a second separator. The gravity-free stirring device has a stirring chamber and a briquette inlet, a briquette outlet, and a coal powder outlet communicating with the stirring chamber. The first separator has a first separation chamber and a first separation inlet, a first separation outlet, and a first coal powder outlet communicating with the first separation chamber. The first separation inlet is connected to the briquette outlet, and the first separation outlet is connected to a conveying device to transport the de-pulverized briquettes to the oxidation and carbonization stage via the conveying device. The second separator has a second separation chamber and a second separation inlet and a second separation outlet communicating with the second separation chamber. The coal powder outlet and the first coal powder outlet are both connected to the second separation inlet, and the second separation outlet is connected to a buffer chamber.

[0006] Furthermore, the briquette pre-de-pulverization system also includes a dust collector. The first connection port of the dust collector is connected to the second pulverized coal outlet of the second separator, and the second pulverized coal outlet is connected to the second separation chamber, so that the dust collector provides airflow to the second separation chamber, the stirring chamber, and the first separation chamber. The second connection port of the dust collector is connected to the briquetting device.

[0007] Furthermore, the briquette pre-de-pulverization system also includes a wind speed regulating valve, which is installed on the air duct connecting the dust collector and the second separator.

[0008] Furthermore, the zero-gravity stirring device includes a supporting partition and a stirring assembly. The supporting partition is disposed within the stirring chamber and divides the stirring chamber into a first receiving chamber and a second receiving chamber. A discharge port is provided on the supporting partition, and the first receiving chamber is connected to the second receiving chamber through the discharge port. The stirring assembly is disposed within the first receiving chamber. The briquette inlet is connected to the first receiving chamber. After de-powdering treatment, the briquette enters the second receiving chamber through the discharge port. The briquette outlet is connected to the second receiving chamber. The briquette enters the first separation chamber through the briquette outlet and the first separation inlet. The detached coal powder enters the second separation chamber sequentially through the coal powder outlet and the second separation inlet under the action of airflow.

[0009] Furthermore, the stirring assembly includes a rotating shaft and multiple stirring structures, wherein the rotating shaft is rotatably disposed within a first receiving cavity; the multiple stirring structures are spaced apart along the axial direction of the rotating shaft, and adjacent stirring structures are disposed with a first included angle A between them, wherein the first included angle A satisfies: 30°≤A≤145°.

[0010] Furthermore, multiple stirring structures are arranged at equal intervals, and the distance between two adjacent stirring structures is L1, wherein 20cm≤L1≤40cm.

[0011] Furthermore, the stirring structure includes a cylinder and two trapezoidal blades, wherein the cylinder is connected to a rotating shaft; the two trapezoidal blades are respectively disposed at both ends of the axial direction of the cylinder, and each trapezoidal blade is disposed with the rotating shaft at a second included angle B, wherein the second included angle B satisfies: 30°≤B≤45°.

[0012] Furthermore, the cylinder is a hollow structure, and / or the trapezoidal blade is a hollow structure.

[0013] Furthermore, there are two rotating shafts, which are arranged in parallel. Each rotating shaft is equipped with multiple stirring structures. The two stirring structures arranged opposite each other at the same radial position on the two rotating shafts are arranged at a first included angle A. The gravity-free stirring device includes at least two sets of discharge port groups. Each set of discharge port groups includes two discharge ports, which are located below the two rotating shafts respectively. The two discharge ports in the same group are connected to the briquette outlet through a Y-shaped connecting pipe.

[0014] Furthermore, the zero-gravity mixing device also includes a discharge port regulating valve, which is located in the second receiving cavity and on the connecting pipeline between the discharge port and the briquette outlet.

[0015] Furthermore, the first separator includes a material distribution structure, which is disposed within the first separation chamber. The material distribution structure is conical and has multiple spaced-apart discharge ports, each with a diameter larger than the particle size of the briquettes. One of the discharge ports is located at the geometric center of the material distribution structure, while the remaining discharge ports are located on the outer periphery of the discharge port at the geometric center of the material distribution structure and are spaced apart around the circumference of the material distribution structure.

[0016] Furthermore, the distance between the bottom plane of the fabric structure and the bottom inner wall of the first separation chamber is L2, where 40cm≤L2≤50cm.

[0017] Furthermore, the connecting pipeline between the briquette outlet and the first separation inlet is set at a third included angle C with the axial direction of the material distribution structure, and the third included angle C satisfies: 40°≤C≤60°.

[0018] Furthermore, the second separator includes a rotary separator.

[0019] According to another aspect of the present invention, a de-pulverization method for a briquette pre-de-pulverization system is provided for the aforementioned briquette pre-de-pulverization system. The de-pulverization method includes the following steps: pressing briquettes of a first particle size R1 into a mixing chamber at a preset speed V1 through the briquette inlet of a gravity-free stirring device, and stirring for a preset time T1 to remove coal dust; conveying the de-pulverized briquettes through the briquette outlet and the first separation inlet of a first separator into a first separation chamber for preliminary separation, wherein the briquettes of the first particle size R1 are conveyed to a conveying device through the first separation outlet of the first separator, so that the de-pulverized briquettes are transported to the oxidation and carbonization stage by the conveying device; coal dust of a second particle size R2 enters the second separation chamber through the first coal dust outlet of the first separator and the second separation inlet of the second separator; and coal dust of a third particle size R3 is recovered into a buffer chamber through the second separation outlet of the second separator.

[0020] Furthermore, the de-powdering method also includes the following steps: coal powder with a fourth particle size R4 enters the dust collector through the second coal powder outlet of the second separator and the first connecting port of the dust collector, and is then transported to the briquetting device through the second connecting port of the dust collector.

[0021] Furthermore, the first particle size R1 satisfies: 8 mesh ≤ R1 ≤ 3 mesh; the preset speed V1 satisfies: 3t / h ≤ V1 ≤ 5t / h; the preset duration T1 satisfies: 0 < T1 ≤ 30min; the second particle size R2 satisfies: R2 < 8 mesh; and the third particle size R3 satisfies: 30 mesh ≤ R3 ≤ 8 mesh.

[0022] Furthermore, the fourth particle size R4 satisfies: R4 < 30 mesh.

[0023] In the technical solution of this invention, the briquettes enter the mixing chamber through the briquette inlet, are stirred to remove coal powder from their surface, and then discharged through the briquette outlet. Part of the coal powder is discharged from the coal powder outlet and enters the second separation chamber through the second separation inlet. The first separation inlet is connected to the briquette outlet. The de-powdered briquettes and the remaining detached coal powder enter the first separation chamber through the first separation inlet for separation. The de-powdered briquettes are discharged from the first separation outlet, enter a conveying device, and are transported to the oxidation and carbonization stage for subsequent oxidation and carbonization processes. The remaining coal powder is discharged from the first coal powder outlet and enters the second separation chamber through the second separation inlet. The second separation chamber discharges the collected coal powder from the second separation outlet into a buffer bin for re-briquetting. This process of oxidizing and carbonizing the briquettes and pre-de-powdering reduces the amount of coal powder removed during oxidation and carbonization, increasing product yield. Furthermore, the detached coal powder can be recycled and reprocessed, increasing product yield and reducing economic costs. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A schematic diagram of a briquette pre-de-pulverization system according to an optional embodiment of the present invention is shown;

[0026] Figure 2 It shows Figure 1 A schematic diagram of the internal structure of the zero-gravity stirring device in the coal briquette pre-de-pulverization system.

[0027] Figure 3 It shows Figure 2 A schematic diagram of the zero-gravity stirring device from another perspective;

[0028] Figure 4 It shows Figure 1 A schematic diagram of the internal structure of the first separator in the coal briquette pre-de-pulverization system;

[0029] Figure 5 A schematic flowchart of a briquette pre-de-pulverization system according to an optional embodiment of the present invention is shown.

[0030] The above figures include the following reference numerals:

[0031] 10. Gravity-free mixing device; 11. Mixing chamber; 111. First receiving chamber; 112. Second receiving chamber; 12. Briquette inlet; 13. Briquette outlet; 14. Pulverized coal outlet; 15. Supporting partition; 151. Discharge connection port; 16. Mixing assembly; 161. Rotating shaft; 162. Mixing structure; 1621. Cylindrical part; 1622. Trapezoidal impeller; 17. Discharge port regulating valve;

[0032] 20. First separator; 21. First separation chamber; 22. First separation inlet; 24. First pulverized coal outlet; 25. Fabric distribution structure; 251. Material discharge port;

[0033] 30. Second separator; 31. Second separation chamber; 32. Second separation inlet; 33. Second pulverized coal outlet;

[0034] 40. Dust collector; 41. First connecting port; 42. Second connecting port;

[0035] 50. Conveying device; 60. Air speed regulating valve; 70. Mixing screw conveyor; 80. Y-type connecting pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] To address the problem of high powder removal rate and non-recyclable coal powder in existing briquette crushing processes during carbonization, this invention provides a briquette pre-de-powdering system and a powder removal method for the briquette pre-de-powdering system.

[0038] like Figures 1 to 4As shown, the briquette pre-de-pulverization system is used to modify briquettes before the oxidation and carbonization processes to remove coal dust from the surface of the briquettes and recycle the coal dust. The briquette pre-de-pulverization system includes a gravity-free stirring device 10, a first separator 20, and a second separator 30. The gravity-free stirring device 10 has a stirring chamber 11 and a briquette inlet 12, a briquette outlet 13, and a coal dust outlet 14 communicating with the stirring chamber 11. The first separator 20 has a first separation chamber 21 and a first separation inlet communicating with the first separation chamber 21. 22. A first separation outlet and a first pulverized coal outlet 24, wherein the first separation inlet 22 is connected to the briquette outlet 13, and the first separation outlet is connected to the conveying device 50, so as to transport the briquettes after de-pulverization to the oxidation and carbonization stage by the conveying device 50; the second separator 30 has a second separation chamber 31 and a second separation inlet 32 ​​and a second separation outlet connected to the second separation chamber 31, wherein the pulverized coal outlet 14 and the first pulverized coal outlet 24 are both connected to the second separation inlet 32, and the second separation outlet is connected to the buffer chamber.

[0039] Applying the technical solution of this invention, briquettes enter the mixing chamber 11 through the briquette inlet 12, undergo mixing, and have coal powder removed from their surface. The briquettes, carrying a small amount of coal powder, are discharged through the briquette outlet 13. The briquette outlet 13 is connected to the first separation inlet 22 of the first separator 20. The de-powdered briquettes, carrying a small amount of coal powder, enter the first separation chamber 21 through the first separation inlet 22 for separation. After separation, the briquettes are discharged from the first separation outlet and placed on the conveying device 50. The conveying device 50 transports the briquettes to the oxidation and carbonization stages for subsequent oxidation and carbonization processes. The remaining coal powder in the mixing chamber 11 is discharged from the coal powder outlet 14 and then undergoes a second separation process. The coal powder separated in the first separation chamber 21 is discharged from the first coal powder outlet 24 and enters the second separation chamber 31 through the second separation inlet 32 ​​for further separation. The coal powder collected in the second separation chamber 31 is then discharged from the second separation outlet after being subjected to rotary separation and enters the buffer chamber for re-bridging. In this way, the coal briquettes are de-powdered in advance before the oxidation and carbonization processes. On the one hand, this reduces the amount of coal powder removed during the oxidation and carbonization processes, thereby increasing the product yield. On the other hand, the de-powdered coal powder can be recycled and reprocessed, thus increasing the product yield and reducing economic costs.

[0040] It should be noted that in this application, both crushed briquette material and de-pulverized briquette are referred to as briquette, and the coal powder particles produced after de-pulverization are referred to as coal powder.

[0041] like Figures 1 to 4As shown, the briquette pre-de-pulverization system also includes a dust collector 40. The first connection port 41 of the dust collector 40 is connected to the second pulverized coal outlet 33 of the second separator 30, and the second pulverized coal outlet 33 is connected to the second separation chamber 31, so that the dust collector 40 provides airflow to the second separation chamber 31, the stirring chamber 11, and the first separation chamber 21. The second connection port 42 of the dust collector 40 is connected to the briquetting device. In this way, the airflow from the dust collector 40 enters the second separation chamber 31, and then enters the stirring chamber 11, the first separation chamber 21, and the second separation chamber 31, causing the briquettes and pulverized coal to be fluidized.

[0042] It should be noted that in this application, the dust collector 40 is located 20°~30° above the second separator 30. The detached coal powder is fluidized by the airflow and then recycled to the buffer bin for re-briquetting. The unrecovered coal powder is collected in the dust collector 40 and then fed back into the briquetting system through the mixing screw 70.

[0043] like Figure 3 As shown, the briquette pre-de-pulverization system also includes a wind speed regulating valve 60, which is installed on the air duct connecting the dust collector 40 and the second separator 30. Thus, the wind speed regulating valve 60 can adjust the air volume, thereby controlling the fluidization rate of the briquettes and pulverized coal.

[0044] Preferably, the airflow control valve 60 has an airflow control range of 30%~45% to control the fluidization rate of briquettes and pulverized coal.

[0045] like Figure 2As shown, the zero-gravity stirring device 10 includes a supporting partition 15 and a stirring assembly 16. The supporting partition 15 is disposed in the stirring chamber 11 and divides the stirring chamber 11 into a first receiving chamber 111 and a second receiving chamber 112. The supporting partition 15 has a discharge port 151. The first receiving chamber 111 is connected to the second receiving chamber 112 through the discharge port 151. The stirring assembly 16 is disposed in the first receiving chamber 111. The briquette inlet 12 is connected to the first receiving chamber 111. The briquettes after de-powdering are discharged into the second receiving chamber 112 through the discharge port 151. The briquette outlet 13 is connected to the second receiving chamber 112. The briquettes are discharged into the first separation chamber 21 through the briquette outlet 13 and the first separation inlet 22. The detached coal powder is discharged into the second separation chamber 31 through the coal powder outlet 14 and the second separation inlet 32 ​​under the action of airflow. In this way, after the briquettes enter the first receiving chamber 111 and undergo stirring and de-pulverization, the smaller coal particles are drawn back into the second separation chamber 31 through the coal powder outlet 14 and the second separation inlet 32 ​​under the action of airflow. The briquettes after de-pulverization, carrying a small amount of coal powder, are discharged from the discharge connection port 151 and enter the second receiving chamber 112. Then, they enter the first separation chamber 21 through the briquettes outlet 13 and the first separation inlet 22. This not only completes the de-pulverization of the briquettes but also performs preliminary recovery of some coal powder, thereby improving the coal powder recovery efficiency.

[0046] It should be noted that, in this application, in conjunction with Figure 2 As can be seen, the briquette inlet 12 and the discharge port 151 in this application are located at both ends of the gravity-free mixing device 10. After the briquette enters the mixing chamber 11 of the gravity-free mixing device 10 from the briquette inlet 12, it is discharged from the discharge port 151 after de-powdering treatment, carrying a small amount of coal powder. A very small amount of briquette remains on the support partition 15 far away from the discharge port 151 and is discharged periodically.

[0047] Optionally, the support baffle 15 is inclined downward in the direction from the briquette inlet 12 to the discharge port 151. In this way, the briquette can automatically roll into the discharge port 151 by its own gravity and be automatically discharged, reducing the burden on the staff.

[0048] like Figure 2As shown, the stirring assembly 16 includes a rotating shaft 161 and multiple stirring structures 162. The rotating shaft 161 is rotatably disposed within a first receiving cavity 111. The multiple stirring structures 162 are spaced apart along the axial direction of the rotating shaft 161. Adjacent stirring structures 162 are positioned at a first included angle A, where 30° ≤ A ≤ 145°. Thus, the rotation of the rotating shaft 161 drives the multiple stirring structures 162 to rotate, stirring the briquettes located in the first receiving cavity 111 to achieve the purpose of briquette de-pulverization. The first included angle A between two stirring structures 162 improves the de-pulverization efficiency.

[0049] Preferably, the first included angle A between two adjacent stirring structures 162 in the plurality of stirring structures 162 is 90°. In this way, while ensuring the reliability of stirring the briquettes by the stirring structures 162, coal dust on the surface of the briquettes can also be effectively removed.

[0050] Furthermore, multiple stirring structures 162 are arranged at equal intervals, and the distance between two adjacent stirring structures 162 is L1, wherein 20cm≤L1≤40cm. In this way, the multiple stirring structures 162 are arranged at equal intervals to avoid interference between two adjacent stirring structures 162, which would prevent them from performing stirring operations normally.

[0051] like Figure 2 As shown, the stirring structure 162 includes a cylinder 1621 and two trapezoidal blades 1622. The cylinder 1621 is connected to a rotating shaft 161. The two trapezoidal blades 1622 are respectively disposed at both ends of the axial direction of the cylinder 1621, and each trapezoidal blade 1622 is disposed at a second included angle B with the rotating shaft 161, wherein the second included angle B satisfies: 30°≤B≤45°. In this way, during the stirring of the briquettes, the two trapezoidal blades 1622 simultaneously exert a force on the briquettes to move axially along the rotating shaft 161, causing the briquettes to move in a direction closer to the discharge port 151.

[0052] Preferably, 8 to 15 stirring structures 162 are provided on a single rotating shaft 161, and the two trapezoidal blades 1622 of each stirring structure 162 are arranged opposite each other at 180°.

[0053] It should be noted that in this application, the cylinder 1621 is a hollow structure, and / or the trapezoidal impeller 1622 is a hollow structure. This hollow structure of the cylinder 1621 reduces its weight, thus facilitating a lightweight design for the stirring structure 162. Similarly, the hollow structure of the trapezoidal impeller 1622 reduces its weight, also contributing to a lightweight design for the stirring structure 162.

[0054] Preferably, the inner diameter of the cylinder 1621 is in the range of 3~8cm, and the length is in the range of 20~30cm.

[0055] like Figure 2 As shown, there are two rotating shafts 161, which are arranged in parallel. Each rotating shaft 161 is provided with multiple stirring structures 162. The two stirring structures 162 arranged opposite each other at the same radial position on the two rotating shafts 161 are arranged at a first included angle A. The gravity-free stirring device 10 includes at least two sets of discharge connection ports. Each set of discharge connection ports includes two discharge connection ports 151. The two discharge connection ports 151 are located below the two rotating shafts 161 respectively, and the two discharge connection ports 151 in the same set are connected to the briquette outlet 13 through a Y-shaped connecting pipe 80. In this way, the two rotating shafts 161 are arranged in parallel and each has multiple stirring structures 162, which improves the stirring efficiency and shortens the briquette de-powdering time. The two stirring structures 162 arranged opposite each other at the same radial position on the two rotating shafts 161 are set at a first included angle A to avoid interference between the two stirring structures 162 at the same position during the rotation of the two rotating shafts 161, which would compromise the stirring reliability of the stirring structures 162. Two sets of discharge connection ports are set to ensure that the briquette can be discharged from the discharge connection port 151 as much as possible, thereby improving the discharge rate.

[0056] It should be noted that in this application, the zero-gravity stirring device 10 also includes a motor, which is located in the first receiving cavity 111 and is driven by two rotating shafts 161 to ensure that the motor can drive the two rotating shafts 161 to rotate synchronously at the same time.

[0057] It should be noted that in this application, the four discharge ports 151 are on the same side of the gravity-free stirring device 10, inside the second receiving cavity 112. Each of the two discharge ports 151 is connected to a pipe with an inner diameter of 12-20 cm, a length of 50-60 cm, and an angle of 45° with the horizontal direction. The two pipes are connected to a vertical pipe with an inner diameter of 15-20 cm near the briquette outlet 13 to form the above-mentioned Y-shaped connecting pipe 80. The Y-shaped connecting pipes 80 of the two sets of discharge ports are the same.

[0058] like Figure 3 As shown, the zero-gravity stirring device 10 also includes a discharge port regulating valve 17, which is disposed in the second receiving cavity 112 and located on the connecting pipe between the discharge port 151 and the briquette outlet 13. In this way, the discharge speed is adjusted by the discharge port regulating valve 17, thereby controlling the stirring time of the briquette.

[0059] It should be noted that in this application, each of the four pipes connected to the discharge port 151 at a 45° angle to the horizontal direction is equipped with a butterfly valve in the middle. The four butterfly valves are divided into two groups, with the two butterfly valves in the same group arranged parallel to the rotating shaft 161. There are two discharge port regulating valves 17, which are arranged one-to-one with the two groups of butterfly valves. The two butterfly valves parallel to the rotating shaft 161 are controlled by the same discharge port regulating valve 17. The valve opening range of the butterfly valve is 0~25cm.

[0060] like Figure 4 As shown, the first separator 20 includes a cloth structure 25 disposed within the first separation chamber 21. The cloth structure 25 is conical and has multiple spaced-apart discharge ports 251, each with a diameter larger than the particle size of the briquettes. One discharge port 251 is located at the geometric center of the cloth structure 25, while the remaining discharge ports 251 are located on the outer periphery of the discharge port 251 at the geometric center of the cloth structure 25, and are spaced apart around the cloth structure 25. In this conical shape, after the briquettes enter the first separation chamber 21, they are fluidized by the airflow generated by the dust collector 40 and rotate, allowing the briquettes to be evenly distributed to each discharge port 251 after rotation, ensuring that the briquettes fall evenly onto the conveying device 50.

[0061] Preferably, one of the multiple material discharge ports 251 is located at the geometric center of the fabric structure 25 and is circular. The material discharge port 251 located at the center and the other material discharge ports 251 located on its outer periphery have an annular structure. The annular area between the outer peripheral surface of the annular structure and the inner wall surface of the first separation cavity 21, the other material discharge ports 251 located on the outer periphery of the material discharge port 251 located at the center are spaced apart in the annular area, and each material discharge port 251 located in the annular area is fan-shaped.

[0062] It should be noted that, in this application, the height of the first separator 20 ranges from 120 to 150 cm.

[0063] Preferably, the distance between the bottom plane of the fabric structure 25 and the bottom inner wall of the first separation chamber 21 is L2, wherein 40cm≤L2≤50cm. In this way, by reasonably optimizing the distance L2 between the bottom plane of the fabric structure 25 and the bottom inner wall of the first separation chamber 21, it avoids the coal briquettes from being scattered outside the conveying device 50 due to an excessively high distance L2, and also avoids the inability to ensure the uniform distribution of the coal briquettes due to an excessively low distance L2.

[0064] like Figure 1As shown, the connecting pipe between the briquette outlet 13 and the first separation inlet 22 is set at a third included angle C with the axial direction of the cloth structure 25, where the third included angle C satisfies: 40°≤C≤60°. This ensures that the briquette carries a small amount of coal powder into the first separation chamber 21. Under the action of the airflow provided by the dust collector 40, the briquette can rotate with the airflow in the first separation chamber 21, ensuring the separation reliability of the first separator 20.

[0065] Furthermore, the second separator 30 includes a rotary separator.

[0066] It should be noted that in this application, the rotary separator consists of a cylindrical cavity and a conical bottom. The height of the cylinder is 50cm, the inner diameter of the cylinder is 80cm, the height of the conical part is 100cm, and the diameter of the bottom is 30cm. The material enters the cyclone separator tangentially and moves in a clockwise circular motion. The airflow speed is then controlled by the inlet wind speed regulating valve of the dust collector.

[0067] like Figure 5 As shown, this application provides a de-pulverization method for a briquette pre-de-pulverization system. The de-pulverization method includes the following steps: briquettes of a first particle size R1 are conveyed to a mixing chamber 11 through the briquette inlet 12 of a gravity-free stirring device 10 at a preset speed V1, and stirred for a preset time T1 to remove coal dust; the de-pulverized briquettes are conveyed to a first separation chamber 21 through the briquette outlet 13 and the first separation inlet 22 of a first separator 20 for preliminary separation, wherein the briquettes of the first particle size R1 are conveyed to a conveying device 50 through the first separation outlet of the first separator 20, so that the de-pulverized briquettes are transported to the oxidation and carbonization stage by the conveying device 50; coal dust of the second particle size R2 enters the second separation chamber 31 through the first coal dust outlet 24 of the first separator 20 and the second separation inlet 32 ​​of the second separator 30; coal dust of the third particle size R3 is recovered to a buffer bin through the second separation outlet of the second separator 30. This process achieves pre-de-pulverization of briquettes, improves their mechanical strength, reduces the de-pulverization rate during oxidation and carbonization, increases the yield of carbonized material, and simultaneously recycles the detached coal powder, enabling its recycling, reducing production costs, and increasing product yield.

[0068] like Figure 5 As shown, the de-dust removal method further includes the following steps: coal dust of the fourth particle size R4 enters the dust collector 40 through the second coal dust outlet 33 of the second separator 30 and the first connecting port 41 of the dust collector 40, and is then conveyed to the briquetting device through the second connecting port 42 of the dust collector 40. In this way, by recovering coal dust of different particle sizes, environmental coal dust pollution is reduced, and safety hazards and equipment malfunctions caused by coal dust accumulation are reduced.

[0069] It should be noted that in this application, the first particle size R1 satisfies: 8 mesh ≤ R1 ≤ 3 mesh; the preset speed V1 satisfies: 3t / h ≤ V1 ≤ 5t / h; the preset duration T1 satisfies: 0 < T1 ≤ 30min; the second particle size R2 satisfies: R2 < 8 mesh; and the third particle size R3 satisfies: 30 mesh ≤ R3 ≤ 8 mesh.

[0070] Furthermore, the fourth particle size R4 satisfies: R4 < 30 mesh.

[0071] It should be noted that, in this application, the industrial effects of the briquette pre-de-pulverization system and the briquette pre-de-pulverization method are explained by combining the differences between the following embodiments and the comparative examples.

[0072] Example 1

[0073] The crushed material with an average particle size of 3-8 mesh is fed into the zero-gravity mixing device 10 at a rate of 3-5 t / h and mixed for 5 minutes. The briquettes and coal powder enter the first separator 20 together. The briquettes and coal powder with a particle size of 3-8 mesh are evenly dispersed by the material distribution structure 25 and fall onto the conveying device 50 to enter the oxidation and carbonization section. The coal powder with a particle size <8 mesh enters the second separator 30 and is fluidized and moves in a circular motion under the action of high-speed airflow. The opening of the inlet wind speed regulating valve of the dust collector 40 is controlled at 30%. The coal powder with a particle size of 8-30 mesh is recovered to the buffer bin at the bottom of the second separator 30 and pressed into briquettes again. The fine coal powder with a particle size <30 mesh enters the dust collector 40 and is fed back into the briquetting system by the mixing screw 70.

[0074] The strength of the pre-de-powdered granules was tested to be 93.96%, the de-powdering rate of the material during the oxidation and carbonization process was 18.73%, and the yield of carbonized material was 73.19%.

[0075] Example 2

[0076] It should be noted that the difference between this embodiment and Embodiment 1 is that the briquettes are stirred for 10 minutes in the gravity-free stirring device 10.

[0077] Briquettes with an average particle size of 3-8 mesh are fed into a zero-gravity mixing device 10 at a rate of 3-5 t / h and mixed for 10 minutes. The briquettes and coal powder are then fed into the first separator 20. The briquettes and coal powder with a particle size of 3-8 mesh are evenly dispersed by the material distribution structure 25 and fall onto the conveying device 50 to enter the oxidation and carbonization section. Coal powder with a particle size <8 mesh enters the second separator 30 and is fluidized and moves in a circular motion under the action of high-speed airflow. The opening of the inlet wind speed regulating valve of the dust collector 40 is controlled at 30%. Coal powder with a particle size of 8-30 mesh is recovered from the bottom of the second separator 30 to the buffer bin for re-briquetting. Fine coal powder with a particle size <30 mesh enters the dust collector 40 and is fed back into the briquetting system by the mixing screw 70.

[0078] The strength of the pre-de-powdered granules was tested to be 93.96%, the de-powdering rate of the material during the oxidation and carbonization process was 18.73%, and the yield of carbonized material was 73.19%.

[0079] Example 3

[0080] It should be noted that the difference between this embodiment and Embodiment 1 is that the briquettes are stirred for 15 minutes in the gravity-free stirring device 10.

[0081] Briquettes with an average particle size of 3-8 mesh are fed into a zero-gravity mixing device 10 at a rate of 3-5 t / h and mixed for 15 minutes. The briquettes and coal powder are then fed into the first separator 20. The briquettes and coal powder with a particle size of 3-8 mesh are evenly dispersed by the material distribution structure 25 and fall onto the conveying device 50 to enter the oxidation and carbonization section. Coal powder with a particle size <8 mesh enters the second separator 30 and is fluidized and moves in a circular motion under the action of high-speed airflow. The opening of the inlet wind speed regulating valve of the dust collector 40 is controlled at 30%. Coal powder with a particle size of 8-30 mesh is recovered from the bottom of the second separator 30 to the buffer bin for re-briquetting. Fine coal powder with a particle size <30 mesh enters the dust collector 40 and is fed back into the briquetting system by the mixing screw 70.

[0082] The strength of the pre-de-powdered granules was tested to be 94.12%, the de-powdering rate of the material during the oxidation and carbonization process was 16.19%, and the yield of carbonized material was 74.86%.

[0083] Comparative Example

[0084] The difference between this comparative example and Example 1 is that the briquettes do not undergo a pre-de-pulverization system.

[0085] The qualified briquettes are directly fed into the oxidation and carbonization process via the conveyor device 50 without going through the pre-de-pulverization system.

[0086] The strength of the granular material was tested to be 90.43%, the de-powdering rate of the material during the oxidation and carbonization process was 24.35%, and the yield of carbonized material was 64.77%.

[0087] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0088] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0089] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0090] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0091] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A briquette pre-de-pulverization system, characterized in that, The briquette pre-de-pulverization system is used to modify briquettes before oxidation and carbonization processes to remove coal dust from the surface of the briquettes and to recycle the coal dust. The zero-gravity stirring device (10) has a stirring chamber (11) and a briquette inlet (12), a briquette outlet (13), and a coal powder outlet (14) connected to the stirring chamber (11). The first separator (20) has a first separation chamber (21) and a first separation inlet (22), a first separation outlet, and a first coal powder outlet (24) connected to the first separation chamber (21). The first separation inlet (22) is connected to the briquette outlet (13), and the first separation outlet is connected to the conveying device (50) to transport the de-powdered briquette to the oxidation and carbonization station through the conveying device (50). The second separator (30) has a second separation chamber (31) and a second separation inlet (32) and a second separation outlet connected to the second separation chamber (31). The coal powder outlet (14) and the first coal powder outlet (24) are both connected to the second separation inlet (32), and the second separation outlet is connected to the buffer chamber. The briquette pre-de-pulverization system also includes: The dust collector (40) has a first communication port (41) connected to the second coal powder outlet (33) of the second separator (30), and the second coal powder outlet (33) connected to the second separation chamber (31) so that the dust collector (40) provides airflow to the second separation chamber (31), the stirring chamber (11), and the first separation chamber (21). The second communication port (42) of the dust collector (40) is connected to the briquetting device. The briquette pre-de-pulverization system also includes: Wind speed regulating valve (60), the wind speed regulating valve (60) is installed on the air duct connecting the dust collector (40) and the second separator (30); The zero-gravity stirring device (10) includes: A support partition (15) is provided inside the stirring chamber (11) and divides the stirring chamber (11) into a first receiving chamber (111) and a second receiving chamber (112). A discharge port (151) is provided on the support partition (15). The first receiving chamber (111) communicates with the second receiving chamber (112) through the discharge port (151). A stirring assembly (16) is disposed in the first receiving cavity (111). The briquette inlet (12) is connected to the first receiving cavity (111). After de-powdering treatment, the briquette enters the second receiving cavity (112) through the discharge port (151). The briquette outlet (13) is connected to the second receiving cavity (112). The briquette enters the first separation cavity (21) through the briquette outlet (13) and the first separation inlet (22). The detached coal powder enters the second separation cavity (31) in sequence through the coal powder outlet (14) and the second separation inlet (32) under the action of airflow. The first separator (20) includes: The fabric structure (25) is disposed in the first separation chamber (21). The fabric structure (25) is conical and has multiple spaced discharge ports (251). The diameter of each discharge port (251) is larger than the particle size of the briquette. One of the discharge ports (251) is located at the geometric center of the fabric structure (25). The remaining discharge ports (251) are located on the outer periphery of the discharge port (251) at the geometric center of the fabric structure (25). The remaining discharge ports (251) are spaced around the fabric structure (25). The second separator (30) includes a rotary separator.

2. The briquette pre-de-pulverization system according to claim 1, characterized in that, The stirring assembly (16) includes: A rotating shaft (161) is rotatably disposed within the first receiving cavity (111); Multiple stirring structures (162) are arranged at intervals along the axial direction of the rotating shaft (161). Two adjacent stirring structures (162) are arranged with a first included angle A, wherein the first included angle A satisfies: 30°≤A≤145°.

3. The briquette pre-de-pulverization system according to claim 2, characterized in that, The multiple stirring structures (162) are arranged at equal intervals, and the distance between two adjacent stirring structures (162) is L1, wherein 20cm≤L1≤40cm.

4. The briquette pre-de-pulverization system according to claim 2, characterized in that, The stirring structure (162) includes: A cylinder (1621) is connected to the rotating shaft (161); Two trapezoidal blades (1622) are respectively disposed at both ends of the axial direction of the cylinder (1621), and each trapezoidal blade (1622) and the rotating shaft (161) are disposed at a second included angle B, wherein the second included angle B satisfies: 30°≤B≤45°.

5. The briquette pre-de-pulverization system according to claim 4, characterized in that, The cylinder (1621) is hollow, and / or the trapezoidal blade (1622) is hollow.

6. The briquette pre-de-pulverization system according to claim 2, characterized in that, There are two rotating shafts (161), which are arranged in parallel. Each rotating shaft (161) is provided with a plurality of stirring structures (162). The two stirring structures (162) arranged opposite each other at the same radial position on the two rotating shafts (161) are arranged at a first included angle A. The gravity-free stirring device (10) includes at least two sets of discharge ports. Each set of discharge ports includes two discharge ports (151). The two discharge ports (151) are located below the two rotating shafts (161), and the two discharge ports (151) in the same set are connected to the briquette outlet (13) through a Y-shaped connecting pipe (80).

7. The briquette pre-de-pulverization system according to claim 6, characterized in that, The zero-gravity stirring device (10) further includes: The discharge port regulating valve (17) is located in the second receiving cavity (112) and on the connecting pipeline between the discharge port (151) and the briquette outlet (13).

8. The briquette pre-de-pulverization system according to claim 1, characterized in that, The distance between the bottom plane of the fabric structure (25) and the bottom inner wall of the first separation cavity (21) is L2, where 40cm≤L2≤50cm.

9. The briquette pre-de-pulverization system according to claim 1, characterized in that, The connecting pipe between the briquette outlet (13) and the first separation inlet (22) is set at a third included angle C with the axial direction of the fabric structure (25), wherein the third included angle C satisfies: 40°≤C≤60°.

10. A method for removing pulverized coal from a pre-pulverized coal briquette system, characterized in that, For the briquette pre-de-pulverization system according to any one of claims 1 to 9, the de-pulverization method comprises the following steps: The briquettes of the first particle size R1 are conveyed to the mixing chamber (11) through the briquette inlet (12) of the zero-gravity mixing device (10) at a preset speed V1, and are mixed for a preset time T1 to remove coal dust. The briquettes after de-pulverization are transported to the first separation chamber (21) through the briquette outlet (13) and the first separation inlet (22) of the first separator (20) for preliminary separation. The briquettes with a first particle size R1 are transported to the conveying device (50) through the first separation outlet of the first separator (20) so that the briquettes after de-pulverization are transported to the oxidation and carbonization station through the conveying device (50). The coal powder with a second particle size R2 enters the second separation chamber (31) through the first coal powder outlet (24) of the first separator (20) and the second separation inlet (32) of the second separator (30); Coal powder with a third particle size R3 is recovered into the buffer chamber through the second separation outlet of the second separator (30).

11. The de-powdering method according to claim 10, characterized in that, The powder removal method further includes the following steps: The coal powder with a fourth particle size R4 enters the dust collector (40) through the second coal powder outlet (33) of the second separator (30) and the first connecting port (41) of the dust collector (40), and is then transported to the briquetting device through the second connecting port (42) of the dust collector (40).

12. The de-powdering method according to claim 10, characterized in that, The first particle size R1 satisfies: 8 mesh ≤ R1 ≤ 3 mesh; The preset speed V1 satisfies: 3t / h≤V1≤5t / h; The preset duration T1 satisfies: 0 < T1 ≤ 30 min; The second particle size R2 satisfies: R2 < 8 mesh; The third particle size R3 satisfies: 30 mesh ≤ R3 ≤ 8 mesh.

13. The de-powdering method according to claim 11, characterized in that, The fourth particle size R4 satisfies: R4 < 30 mesh.

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