Drying pipeline

Abstract

The utility model relates to a drying pipeline, which comprises a drying pipeline used for communicating a cyclone separator and a rotary flash drying machine, the drying pipeline is used for reducing the temperature of high-temperature gas blown out of a stirring chamber of the rotary flash drying machine, the head end of the drying pipeline is communicated with the top of the stirring chamber, and the tail end of the drying pipeline is communicated with the cyclone separator. The drying pipeline comprises a plurality of airflow drying air pipes and a plurality of pulse pipes, the two ends of each airflow drying air pipe are contracted in the axial direction to form a cone shape, and the pulse pipes and the airflow drying air pipes are arranged in a spaced and sealed mode.

Description

Technical Field

[0001] The utility model relates to the technical field of drying, in particular to a drying pipeline. Background Art

[0002] The working principle of the cyclone separator is to use the rotational motion of the airflow to make the gas containing solid particles rotate strongly. During the rotation process, since the solid particles have a greater inertial centrifugal force than the gas, they are thrown onto the outer wall of the cyclone separator, thereby achieving separation from the gas. This separation method does not require any moving parts, so the maintenance cost is low.

[0003] The rotary flash dryer, also known as the cyclone dryer or rotary fast dryer, combines a variety of technologies, including fluidization, cyclone, spraying, crushing and classification technology. The working principle of this dryer is to use a high-speed rotating agitator to strongly impact, shear and rub the incoming material, so that the material is quickly dispersed into small particles and fully contacted with hot air, so as to quickly evaporate the water and achieve the purpose of drying.

[0004] The high-temperature airflow blown out of the rotary flash dryer enters the cyclone separator through pipes. In the prior art, these pipes are relatively short and pulse tubes are used, resulting in the pipes not having a heat dissipation function. This causes the airflow blown out of the rotary flash dryer to have too high a temperature when entering the cyclone separator, ultimately resulting in a high discharge temperature of the cyclone separator. Utility Model Content

[0005] The main purpose of the utility model is to provide a drying pipeline, which can reduce the temperature of the high-temperature gas while reducing the flow rate of the high-temperature gas in the drying pipeline.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a drying duct, including: a drying duct used to connect a cyclone separator and a rotary flash dryer, the drying duct used to reduce the temperature of the high-temperature gas blown out from the mixing chamber of the rotary flash dryer, the head end of the drying duct is connected to the top of the mixing chamber, the end of the drying duct is connected to the cyclone separator, the drying duct includes a plurality of airflow drying ducts and a plurality of pulse tubes, the two ends of the airflow drying duct are respectively contracted axially into a cone, and the pulse tube and the airflow drying duct are spaced and sealed.

[0007] Preferably, both ends of the airflow drying duct are provided with tubular connecting parts, the connecting parts are provided with a plurality of annular grooves coaxial with the connecting parts, sealing rings are provided in the annular grooves, and the airflow drying duct is threadedly connected to the pulse tube through the connecting parts.

[0008] Further preferably, a portion of the connection portion close to the tapered opening is provided with an external thread, and a port portion of the pulse tube is provided with an internal thread.

[0009] More preferably, an accommodating space is arranged inside the sealing ring, and sodium bicarbonate powder is arranged in the accommodating space.

[0010] More preferably, the pyrolysis temperature of the sodium bicarbonate powder is 50 degrees.

[0011] The beneficial effects of the utility model are:

[0012] The utility model provides a drying effect by extending the drying duct, so that the contact time between the material and the hot air is prolonged, and the final exhaust temperature is reduced. After the high-temperature airflow enters the drying channel, it is lifted by a negative pressure fan. After the airflow carries the material into the airflow drying duct, it forms a vortex in the airflow drying duct and then climbs again, thereby increasing the time that the high-temperature airflow and the material are in the airflow drying duct, thereby increasing the contact time between the material and the hot air. At the same time, the temperature of the high-temperature airflow is reduced through heat exchange between the airflow drying duct and the outside world, thereby achieving a temperature reduction of the high-temperature airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a structural schematic diagram of a low-temperature rotary flash gas flow dryer of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the airflow drying duct of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the sealing ring of the utility model;

[0017] Figure 4 It is a structural schematic diagram of a cyclone separator of the utility model.

[0018] Description of Reference Numerals

[0019] 1. Air radiator; 2. Frequency conversion feeder; 3. Mixing chamber; 31. High-speed breaking disc;

[0020] 4. Drying duct; 41. Airflow drying duct; 411. Connecting part; 412. Sealing ring;

[0021] 42. Pulse tube; 5. Cyclone separator; 51. First vertical pipeline; 52. First conical pipeline;

[0022] 53. second vertical pipeline; 54. second tapered pipeline; 55. third vertical pipeline;

[0023] 56, collecting hopper; 57, exhaust core pipe; 511, feed inlet;

[0024] 6. Negative pressure fan. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0026] like Figure 1 As shown, this embodiment provides a low-temperature rotary flash gas flow dryer, including an air radiator 1, a rotary flash dryer, a variable frequency feeder 2, a drying pipeline 4, a cyclone separator 5 and a negative pressure fan 6, wherein the method of using the low-temperature rotary flash gas flow dryer is as follows: the high-temperature steam first enters the air radiator 1, and the high-temperature steam is cooled by the air radiator 1 to prevent the high-temperature steam from damaging the rotary flash dryer due to excessive temperature, and then the high-temperature steam that has been cooled to a certain temperature flows into the mixing chamber 3 of the rotary flash dryer, and then the logistics is transported into the mixing chamber 3 by the variable frequency feeder 2, and the materials are arranged by the high-speed scattering disk 31 arranged at the bottom of the mixing chamber 3, and then the scattering The material rises with the airflow, and the qualified material enters the drying pipe 4 with the airflow through the classifier arranged on the top of the mixing chamber 3. While the high-temperature airflow further dries the material in the drying pipe 4, the high-temperature airflow is cooled by the drying pipe 4, and then the high-temperature airflow carries the material into the cyclone separator 5, and the gas and the powder material are separated by the cyclone separator 5. The negative pressure fan 6 is connected to the cyclone separator 5, and the negative pressure fan 6 can recover and discharge the airflow in the cyclone separator 5. At the same time, the negative pressure fan 6 can also suck the airflow in the drying pipe 4. The temperature of the gas discharged by the negative pressure fan 6 is between 40 degrees and 45 degrees, and there is no need to add new cooling equipment.

[0027] Specifically, in the present embodiment, the rotary flash dryer comprises a stirring chamber 3, a high-speed scattering disc 31 is arranged at the bottom of the stirring chamber 3, and a classifier is arranged at the top of the stirring chamber 3. As mentioned above, the classifier is used to prevent unqualified materials from entering the subsequent process, and the high-speed scattering disc 31 is used to scatter the materials. The high-temperature steam blown out of the air radiator 1 is blown into the stirring chamber 3 through the tangential direction of the stirring chamber 3. Preferably, the stirring chamber 3 is conical, the small mouth end of the stirring chamber 3 is located at the bottom, and the large mouth end of the stirring chamber 3 is located at the top. In the present embodiment, since the high-temperature steam is blown in from the tangential direction of the small mouth at the bottom, it will generate a rotating airflow, which helps to better disperse the materials, so that each particle can be more fully in contact with the hot steam, improve the heat transfer efficiency, thereby accelerating the evaporation of water, and at the same time, this rotating airflow helps the materials to rise. The design of the conical mixing chamber 3 makes the flow cross-sectional area gradually increase during the upward movement of the airflow. Then, as the cross-sectional area increases, the airflow speed will slow down. As the airflow speed slows down, the rising speed of large particles will also slow down. Therefore, those large particles with a faster rising speed will be quickly chopped by the cutter on the edge of the inner wall of the mixing chamber 3. As the bottom airflow rises, the chopped materials will be brought into the middle rising airflow along with the vortex in the mixing chamber 3, and then brought into the drying channel. In addition, since the airflow speed at the bottom of the mixing chamber 3 is high, the material particles will be quickly driven up to achieve rapid mixing and circulation.

[0028] In this embodiment, if Figures 1 to 3As shown, the drying duct 4 is used to reduce the temperature of the high-temperature gas blown out from the mixing chamber 3. The head end of the drying duct 4 is connected to the top of the mixing chamber 3. The drying duct 4 includes a plurality of airflow drying ducts 41 and a plurality of pulse tubes 42. The two ends of the airflow drying duct 41 are respectively contracted into a cone shape in the axial direction, and the pulse tube 42 is spaced and sealed from the airflow drying duct 41. Specifically, in this embodiment, the two ends of the airflow drying duct 41 are respectively sealed and connected to the pulse tube 42. In order to enhance the sealing between the airflow drying duct 41 and the pulse tube 42, a tubular connecting portion 411 is respectively provided at the two ends of the airflow drying duct 41. The connecting portion 411 is provided with a plurality of annular grooves coaxial with the connecting portion 411. A sealing ring 412 is provided in the annular groove. The airflow drying duct 41 is screwed with the pulse tube 42 through the connecting portion 411. Specifically, the portion of the connecting portion 411 close to the conical mouth is provided with an external thread, and the end portion of the pulse tube 42 is provided with an internal thread. The sealing ring 412 is provided with a containing space in the ring, and sodium bicarbonate powder is provided in the containing space. Preferably, the pyrolysis temperature of the sodium bicarbonate powder is 50 degrees. This embodiment utilizes the characteristic of sodium bicarbonate powder decomposing under heat, and a sealed containing space is opened in the sealing ring 412, and a part of the sodium bicarbonate powder is filled in the containing space. In this way, when the high-temperature airflow passes through the rising and drying air duct, the sodium bicarbonate powder is decomposed under heat to produce carbon dioxide and water, thereby expanding the sealing ring 412, and then filling the annular groove, and finally achieving the purpose of sealing. In this embodiment, the material of the sealing ring 412 is selected from polytetrafluoroethylene. According to the thermal properties of the polytetrafluoroethylene material itself, it is resistant to chemical corrosion. Sodium bicarbonate and pyrolyzed sodium carbonate do not affect polytetrafluoroethylene. At the same time, polytetrafluoroethylene will also expand to a certain extent after being heated, and the carbon dioxide decomposed by sodium bicarbonate after being heated will also fill the containing space to prevent the sealing ring 412 from shrinking. In addition, it should be noted that the shape of the pulse tube 42 can be made into various shapes according to actual needs.

[0029] In this embodiment, if Figure 1 and Figure 4 As shown, the cyclone separator 5 is connected to the tail end of the drying pipe 4, and the gas blown out from the tail end of the drying pipe 4 is blown into the cyclone separator 5 from the tangential direction of the cyclone separator 5. The cyclone separator 5 is used to separate materials and gas.

[0030] Specifically, Figure 4As shown, the cyclone separator 5 includes a first vertical pipe 51, a first conical pipe 52, a second vertical pipe 53, a second conical pipe 54, a third vertical pipe 55 and a collecting hopper 56 which are fixedly connected in sequence. A feed port 511 is provided on one side of the first vertical pipe 51. The airflow and powder in the drying pipe 4 enter the first vertical pipe through the feed port 511. The end of the first vertical pipe 51 is fixedly connected to the large end of the first conical pipe 52, the small end of the first conical pipe 52 is fixedly connected to one end of the second vertical pipe 53, the other end of the second vertical pipe 53 is fixedly connected to the large end of the second conical pipe 54, the small end of the second conical pipe 54 is fixedly connected to one end of the third vertical pipe 55, and the other end of the vertical pipe is fixedly connected to the collecting hopper 56 after extending into the collecting hopper 56. The cyclone separator 5 further includes a conical exhaust core tube 57, the large end of the exhaust core tube 57 is fixedly connected to the pipe connected to the negative pressure fan 6, and the small end of the exhaust core tube 57 extends into the first vertical pipe 51, and the airflow blown into the first vertical pipe 51 through the air inlet surrounds the exhaust core tube 57 for at least four circles. The taper of the first conical tube is 15 degrees.

[0031] In this embodiment, the height-width ratio of the feed port 511 is adjusted to 2.75:1 (appropriate adjustments can be made according to different materials). By designing the exhaust core tube 57 to be conical, the high-temperature gas and its materials entering the first vertical pipe 51 can circle four times in the first vertical pipe 51. At the same time, the conical exhaust core tube 57 also helps to collect the escaping dust materials. The taper of the first conical pipe 52 is designed to be 11 degrees (it can be adjusted according to the size of the material, generally 10 degrees to 15 degrees), and the length of the first conical pipe 52 is increased. While increasing the number of movement circles of the cyclone cone, it is ensured that all materials are discharged from the bottom flow. The third vertical pipe 55 is inserted into the collecting hopper 56 and inserted into different depths according to the specific gravity and particle size of different materials, which can ensure that fine materials are not carried out to overflow by the secondary airflow. In addition, in this embodiment, the design of the second conical pipe 54 can accelerate the deposition of materials.

[0032] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A drying pipeline, the drying pipeline is used to connect a cyclone separator and a spin flash dryer, characterized in that: The drying duct is used to reduce the temperature of the high-temperature gas blown out from the mixing chamber of the rotary flash dryer. The head end of the drying duct is connected to the top of the mixing chamber, and the end of the drying duct is connected to the cyclone separator. The drying duct includes a plurality of airflow drying ducts and a plurality of pulse tubes. The two ends of the airflow drying duct are respectively contracted into a cone shape in the axial direction, and the pulse tube is sealed and arranged with the airflow drying duct at intervals; the two ends of the airflow drying duct are respectively provided with a tubular connecting part, and the connecting part is provided with a plurality of annular grooves coaxial with the connecting part, and a sealing ring is provided in the annular groove, and the airflow drying duct is screwed to the pulse tube through the connecting part.

2. A drying pipeline according to claim 1, characterized in that: The portion of the connecting portion close to the tapered opening is provided with an external thread, and the port portion of the pulse tube is provided with an internal thread.

3. A drying pipeline according to claim 2, characterized in that: An accommodating space is arranged inside the sealing ring, and sodium bicarbonate powder is arranged in the accommodating space.

4. A drying pipeline according to claim 3, characterized in that: The pyrolysis temperature of the sodium bicarbonate powder is 50 degrees.

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