Fluidized bed heat exchange tube nozzle assembly, fluidized bed heat exchange tube and fluidized bed heat exchanger

Abstract

The application provides a nozzle assembly for fluidized bed heat exchange pipe, which comprises a nozzle base, a spiral flow guide column and a spacer, the nozzle base is connected to the bottom end of the heat exchange pipe body and is provided with a plurality of feeding ports, the spiral flow guide column is connected to the top surface of the nozzle base and is provided with a plurality of spiral channels, and the spacer covers the top surface of the spiral flow guide column, the diameter of the hole of the spacer is smaller than the particle size of the stainless steel particles, the number of the feeding ports is the same as that of the spiral channels, and the positions of the feeding ports correspond to those of the spiral channels. By installing the spacer on the top end of the spiral flow guide column, the resistance of the upward movement of the liquid is reduced when starting the fluidized bed heat exchanger, so that the spiral rotational flow can be formed in the heat exchange pipe. In addition, the liquid entering the heat exchange pipe from each feeding port is not subjected to uneven resistance when passing through the nozzle base and the spiral flow guide column, and the liquid entering different heat exchange pipes is not subjected to different resistance, so that the scraping effect of the dirt and ice crystals on the inner wall of each single heat exchange pipe in each direction and on multiple heat exchange pipes is equivalent.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wastewater evaporation and concentration and the field of seawater desalination, and particularly relates to a nozzle assembly for a fluidized bed heat exchange tube; in addition, the present application also relates to a fluidized bed heat exchange tube comprising the nozzle assembly and a fluidized bed heat exchanger. BACKGROUND

[0002] With the continuous improvement of the national environmental protection requirements, the papermaking, petrochemical, printing and dyeing, coal chemical and other industries need to minimize and harmlessly treat the wastewater generated in the production process to reduce pollution and protect the ecological environment. However, the industrial wastewater described above generally has the characteristics of high salt content, high hardness, large viscosity, and complex organic composition, and is prone to fouling and adhesion to the heat exchange tube wall during conventional evaporation and concentration, thereby causing the heat resistance of the heat exchange tube to rise sharply and the heat transfer efficiency to drop to 1 / 2-1 / 3 of the original. This not only causes a large amount of energy waste, but also requires frequent shutdown and cleaning of the heat exchange tube, which cannot achieve efficient and continuous operation of the wastewater treatment system.

[0003] In view of the above problems, heat exchange equipment with online self-cleaning capability has been generally developed at home and abroad, and the fluidized bed is a kind of heat exchange equipment that can achieve self-cleaning capability. The working principle is to use the kinetic energy of the heat transfer liquid itself to drive the cleaning elements (such as particles, springs, etc.) in the heat exchange equipment to achieve automatic cleaning and anti-fouling of the heat exchange surface, and continuously disturb the boundary stagnant layer of the heat exchange surface to achieve enhanced heat transfer, thereby achieving the purpose of high efficiency, energy saving and continuous operation of the heat exchange equipment.

[0004] The above self-cleaning heat exchanger mostly uses a dispersed fluidized bed, that is, the particles are uniformly distributed in the entire fluidized bed under the action of the fluid and the bed layer uniformly expands with the increase of the flow rate, and the bed porosity uniformly increases. Although this kind of fluidized bed can prevent fouling and enhance heat transfer, most of the particles in the vertical heat exchange tube do not move effectively, the kinetic energy and frequency of the particles impacting the heat exchange tube wall are relatively limited, resulting in low efficiency of the dispersed fluidized bed heat exchanger in removing fouling. When the heat exchange equipment is used for a long time, it is often slowly fouled on the heat exchange wall when dealing with wastewater evaporation with large heat transfer temperature difference, high water hardness and high concentration ratio, resulting in the final failure of the heat exchange equipment.

[0005] In addition, the same problem also exists in the field of seawater desalination. Today, the shortage of fresh water resources has become a worldwide problem, and seawater desalination is an important way to solve the shortage of fresh water resources. Seawater freezing desalination has the advantages of low process energy consumption, low corrosion and scaling tendency at low seawater temperature, low equipment investment cost, no need for seawater pretreatment and chemicals, and many other advantages, and is a seawater desalination technology with development potential. However, the problem of low heat transfer efficiency in low temperature environment and ice formation on the heat exchange wall is common in the freezing method of seawater desalination process, which ultimately leads to seawater freezing pipe, low ice making efficiency or failure.

[0006] In view of the above reasons, it is necessary to develop a new type of nozzle assembly for fluidized bed heat exchange pipe, especially for using the nozzle to realize the enhanced heat transfer of wastewater or seawater in the heat exchange pipe in a fluidized manner (i.e. by continuously disturbing the heat transfer pipe inner wall laminar flow of the liquid to achieve the effect of enhancing the heat exchange between the liquid and the heat transfer pipe wall), so as to effectively improve the kinetic energy and frequency of particle impact on the heat exchange pipe wall surface, significantly enhance the on-line descaling ability and heat exchange capacity of the heat exchanger, and the heat transfer efficiency, thereby ensuring the stable operation of the wastewater heating and evaporation process and the freezing method seawater desalination process, and ensuring the continuous and efficient operation of the system, and also reducing the operation and maintenance cost of wastewater treatment and seawater desalination, which has become a technical problem to be solved by the technical personnel in the field.

[0007] CN113599858A discloses a cyclone type fluidized bed cooling crystallization system, the heat transfer pipe includes a heat transfer pipe body, the lower end of the heat transfer pipe body is provided with a filter screen, a spiral nozzle is arranged above the filter screen, and a scraping particle is arranged between the spiral nozzle and the interception screen. However, in actual application, when starting the fluidized bed heat exchanger, it is found that the cyclone cannot be formed in part of the heat exchange pipes, which significantly reduces the scraping efficiency of dirt and ice crystals; and even if the cyclone is formed in the heat exchange pipe, on the one hand, the flow rates of the cyclones in different spiral channels in the same heat exchange pipe are different, which cannot ensure the uniformity of scraping in a single heat exchange pipe; on the other hand, the flow rates of the cyclones in the plurality of heat exchange pipes of the fluidized bed heat exchanger are different, which causes the scraping efficiencies of dirt and ice crystals in the plurality of heat exchange pipes to be different, and cannot guarantee the uniformity between the plurality of heat exchange pipes, thereby shortening the service life of the fluidized bed heat exchanger. SUMMARY

[0008] The present application aims to solve the problems existing in the prior art, i.e. the cyclone cannot be formed in part of the heat exchange pipes when starting the fluidized bed heat exchanger, and the scraping uniformity in a single heat exchange pipe and between a plurality of heat exchange pipes cannot be guaranteed, and specifically provides a new type of nozzle assembly for fluidized bed heat exchange pipe, which ensures that the liquid forms a spiral cyclone motion in the heat exchange pipe by installing a spacer at the top end of the spiral flow guide column, and can make the scraping efficiencies of dirt and ice crystals in all directions of the inner wall of a single heat exchange pipe be equivalent, and can make the scraping efficiencies of dirt and ice crystals in a plurality of heat exchange pipes be equivalent, thereby prolonging the service life of the fluidized bed heat exchanger.

[0009] The present application is realized by the following technical solutions:

[0010] One of the purposes of the present application is to provide a nozzle assembly for fluidized bed heat exchange pipe, which comprises a nozzle base connected to the bottom end of the heat exchange pipe body; the nozzle base is provided with a plurality of feed ports;

[0011] A spiral flow guide column is connected to the top surface of the nozzle base; the spiral flow guide column is provided with a plurality of spiral channels;

[0012] A spacer is arranged on the top surface of the helical flow guide column, and the hole diameter of the spacer is smaller than the particle size of the stainless steel particles.

[0013] The number of the feeding ports is the same as that of the helical channels, and the positions of the feeding ports correspond to those of the helical channels.

[0014] In a preferred embodiment of the present application, the nozzle assembly for the fluidized bed heat exchange tube further comprises a reinforcing member connected to the spacer, and the reinforcing member comprises a plurality of concentric rings with different diameters and a Y-shaped member.

[0015] In a preferred embodiment of the present application, the spacer is detachably connected to the helical flow guide column.

[0016] In a preferred embodiment of the present application,

[0017] The nozzle base is provided with 2-6 feeding ports at equal intervals, and the feeding ports are arranged at the outermost side of the bottom end of the nozzle base.

[0018] The helical flow guide column has any one of a double helical structure, a triple helical structure, a quadruple helical structure, a quintuple helical structure or a sextuple helical structure.

[0019] In a preferred embodiment of the present application, the outer diameter of the helical flow guide column is 1 / 2-1 of the outer diameter of the nozzle base.

[0020] In a preferred embodiment of the present application, the cross-sectional shape of the feeding port is oval, and the minor axis of the feeding port is 1 / 2-1 of the radius of the nozzle base.

[0021] In a preferred embodiment of the present application, the nozzle base is detachably connected to the heat exchange tube body.

[0022] In a preferred embodiment of the present application, the bottom end of the nozzle base is provided with a handle.

[0023] The second object of the present application is to provide a fluidized bed heat exchange tube comprising the nozzle assembly for the fluidized bed heat exchange tube according to the first object of the present application.

[0024] The third object of the present application is to provide a fluidized bed heat exchanger comprising the fluidized bed heat exchange tube of the second object of the present application, which comprises two tube sheets and a plurality of the fluidized bed heat exchange tubes of the second object of the present application, and the two ends of the plurality of the fluidized bed heat exchange tubes are arranged in the two tube sheets respectively.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] (1) The nozzle assembly for the fluidized bed heat exchange tube of the present application reduces the resistance of upward movement of the liquid when starting the fluidized bed heat exchanger by installing a spacer at the top end of the spiral flow guide column, so that a spiral rotational flow movement can be formed in the heat exchange tube. In addition, since the liquid entering the heat exchange tube from each inlet is not subjected to uneven resistance when passing through the nozzle base and the spiral flow guide column, it can maintain a uniform rotational flow speed after passing through the spacer, so that the scraping effect of dirt and ice crystals in each direction of the inner wall of a single heat exchange tube is equivalent. Similarly, since the liquid entering different heat exchange tubes is not subjected to different resistance when passing through the same nozzle base and the same spiral flow guide column, it can maintain a uniform rotational flow speed after passing through the spacer, so that the scraping efficiency of dirt and ice crystals in multiple heat exchange tubes is equivalent, prolonging the service life of the fluidized bed heat exchanger.

[0027] (2) The nozzle assembly for the fluidized bed heat exchange tube of the present application realizes the spiral rotational flow movement of the wastewater liquid and the frozen seawater in the heat exchange tube, and utilizes the centrifugal force of the liquid rotation to drive the particles to be uniformly distributed on the inner wall of the heat exchange tube. The present application can significantly improve the collision kinetic energy and scraping frequency of the particles and the heat exchange wall surface, thereby improving the anti-fouling ability and heat exchange efficiency of the heat exchange tube.

[0028] (3) The nozzle assembly for the fluidized bed heat exchange tube of the present application reduces the disordered movement of particles in the heat exchange tube, increases the effective collision of particles with the inner wall of the heat exchange tube, and improves the efficiency of particle descaling or ice removal in the heat exchange tube.

[0029] (4) The nozzle assembly for the fluidized bed heat exchange tube of the present application forces the particles in the fluidized bed to rotate, making it difficult for the particles to concentrate and agglomerate in the central region of the heat exchange tube under the action of centrifugal force. Due to the guiding effect of the inlet, the fluid impacts the particles to produce directional movement (rotational flow), and the centrifugal force generated thereby promotes the movement of the particles towards the inner wall of the heat exchange tube, thereby avoiding the problem of scraping failure of the inner wall of the heat exchange tube due to particle agglomeration.

[0030] (5) The nozzle assembly for the fluidized bed heat exchange tube of the present application can enhance the self-cleaning ability of the heat exchange tube during the wastewater heat exchange process, better cope with wastewater evaporation working conditions with large heat exchange temperature difference, high water hardness, and high concentration ratio, expand the application range of wastewater treatment, and prolong the equipment downtime maintenance period. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 This is a front view of the nozzle assembly for fluidized bed heat exchange tubes of the present invention;

[0032] Figure 2 This is a top view of the spiral guide column and spacer in the nozzle assembly for fluidized bed heat exchanger tubes of the present invention;

[0033] Figure 3 This is a top view of the spiral guide column and spacer in the nozzle assembly for fluidized bed heat exchanger tubes of the present invention;

[0034] Figure 4 This is a top view of the spiral guide column and reinforcing spacer 13 in the nozzle assembly for fluidized bed heat exchanger tubes of the present invention.

[0035] Figure 5 This is a perspective view of the spiral guide column in the nozzle assembly for fluidized bed heat exchanger tubes of the present invention;

[0036] Figure 6 This is a bottom view of the nozzle base, spiral guide column, and handle in the nozzle assembly for fluidized bed heat exchanger tubes of the present invention.

[0037] In the diagram, 1-spiral guide column, 2-nozzle base, 3-feed inlet, 4-partition screen, 5-nozzle external thread, 6-handle, 7-heat exchange tube body, 8-stainless steel particles, 9-spiral channel, 10-feed hole, 11-discharge hole, 12-partition, 13-reinforcing partition. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings:

[0039] like Figure 1 As shown, the nozzle assembly for fluidized bed heat exchanger tubes of the present invention includes a spiral guide column 1, a nozzle base 2, a feed inlet 3, and a spacer. The nozzle assembly for fluidized bed heat exchanger tubes is located at the lower part of the heat exchanger tube body 7. The nozzle base 2 has an overall cylindrical structure. Preferably, the nozzle base 2 is detachably connected to the heat exchanger tube body 7. In a preferred embodiment of the present invention, the outer cylindrical surface of the nozzle base 2 is provided with an external nozzle thread 5, which can be screwed into the internal thread provided on the lower inner surface of the heat exchanger tube body 7. It should be noted that the mutual screwing of the internal and external threads is only one embodiment of the detachable connection between the nozzle base 2 and the heat exchanger tube body 7, and does not constitute a specific limitation on the connection method between the two. More preferably, a handle 6 is provided at the bottom end of the nozzle base 2, so that the installer can screw the nozzle assembly for fluidized bed heat exchanger tubes to the heat exchanger tube body 7 by twisting the handle 6, making the installation of the nozzle assembly for fluidized bed heat exchanger tubes more convenient.

[0040] The nozzle base 2 has 2 to 6 feed inlets 3, and the 2 to 6 feed inlets 3 are preferably arranged at equal intervals. Figure 6As shown, the spray head base 2 is provided with three feed ports 3, but this does not constitute a limitation on the number of feed ports 3, and the skilled person can set a suitable number of feed ports 3 on the spray head base 2 according to the actual situation. The feed port 3 penetrates the top end and the bottom end of the spray head base 2. Figure 6 In the embodiment, the cross section of the feed port 3 is an oval shape composed of two circular arcs and is located at the outermost side of the bottom surface of the spray head base 2. The oval shape and its position, on the one hand, ensure a certain flow of the liquid, ensuring the scraping effect of the dirt and ice crystals; on the other hand, it plays a guiding role, so that the formed rotational flow is concentrated on the inner wall of the heat exchange pipe body 7, improving the scraping effect of the dirt and ice crystals. Preferably, the minor axis of the feed port 3 is 1 / 2-1 of the radius of the spray head base 2, so as to further ensure the flow of the liquid, and thus ensure the scraping effect of the dirt and ice crystals. It should be noted that, Figure 6 In the embodiment, the feed port 3 is oval-shaped, which does not constitute a limitation on the shape of the feed port 3. It can also be processed into an elliptical or hyperbolic feed port 3, as long as the guiding role and flow of multiple feed ports 3 meet the preset requirements.

[0041] The top surface of the spray head base 2 is connected with the spiral flow guide column 1 (as shown in Figure 5 ), which can be integrally casted for easy installation. The spiral flow guide column 1 is coaxially arranged with the spray head base 2. The outer diameter of the spiral flow guide column 1 is smaller than the outer diameter of the spray head base 2, that is, at the same height position outside the circumferential surface of the spiral flow guide column 1 and inside the heat exchange pipe body 7, an annular gap is formed, which facilitates the installation and disassembly of the spray head base 2 and the spiral flow guide column 1. Moreover, the annular gap can reduce the resistance when the liquid moves upward, which is more conducive to forming a rotational flow; it can also make the force on the spiral channel 9 in the spiral flow guide column 1 uniform when the liquid enters through different feed ports 3, so as to realize that the scraping effect of the dirt and ice crystals in each direction on the inner wall of the single heat exchange pipe is equivalent; and it is more conducive to concentrating the formed rotational flow on the inner wall of the heat exchange pipe body 7, further improving the scraping effect of the dirt and ice crystals. Preferably, the outer diameter of the spiral flow guide column 1 is 1 / 2-1 of the outer diameter of the spray head base 2, which ensures a certain flow of the liquid and also ensures the scraping effect of the dirt and ice crystals. More preferably, the spiral flow guide column 1 is any one of a double spiral structure, a triple spiral structure, a quadruple spiral structure, a quintuple spiral structure or a sextuple spiral structure, and is not limited to Figure 5 the triple spiral structure in the embodiment. It should be noted that the number of spiral channels 9 in the spiral flow guide column 1 is matched with the number of feed ports 3, and the position of the feed port 3 corresponds to the position of the spiral channel 9 in the spiral flow guide column 1. Figure 5In the process, the spiral guide column 1 has three spiral channels 9. The bottom surface of the spiral channel 9 is the feed hole 10, which corresponds to the position of the feed inlet 3. The top surface of the spiral channel 9 is the discharge hole 11.

[0042] To further improve the scraping effect of dirt and ice crystals, in a preferred embodiment of the present invention, the spiral rotation of the spiral guide column 1 is 0.5 to 1. The matching of the spiral rotation and the taper facilitates processing and, on the other hand, ensures the strength of the spiral guide column 1 while allowing the liquid to achieve a more complete swirling effect, thereby achieving the purpose of improving the scraping effect of dirt and ice crystals.

[0043] To further improve the scraping effect of dirt and ice crystals, in a preferred embodiment of the present invention, the spacer is a mesh 4, which is disposed at the top of the spiral guide column 1 (e.g., Figure 2 (As shown). The mesh 4 is detachably connected to the spiral guide column 1, for example, by screws connecting the mesh 4 to the top of the spiral guide column 1. The aperture diameter of the mesh 4 is smaller than the particle size of the stainless steel particles 8. Because the stainless steel particles 8 are prone to overlapping and getting stuck in the feed inlet 3, especially some irregularly shaped stainless steel particles 8, a very high flow rate is required to form a vortex when starting the fluidized bed heat exchanger, and in severe cases, it may even be impossible to start and form a vortex. Moreover, the smaller the minor axis and major axis of the feed inlet 3, the more obvious this jamming situation becomes. In addition to affecting the start-up of the fluidized bed heat exchanger, because the arrangement of stainless steel particles 8 in each feed inlet 3 is different, the scraping effect of dirt and ice crystals on the inner wall of a single heat exchange tube body 7 is uneven in all directions, and the scraping effect of dirt and ice crystals on multiple heat exchange tube bodies 7 is also uneven. This invention reduces the resistance of the upward movement of the liquid when starting the fluidized bed heat exchanger by installing the mesh 4 at the top of the spiral guide column 1, enabling it to form a spiral vortex motion within the heat exchange tube body 7. Furthermore, since the liquid entering the heat exchanger tube body 7 from each feed inlet 3 does not encounter uneven resistance when passing through the nozzle base 2 and the spiral guide column 1, it can maintain a uniform swirling speed after passing through the partition 4, which makes the scraping effect of dirt and ice crystals on the inner wall of a single heat exchanger tube body 7 in all directions comparable. Similarly, since the liquid entering different heat exchanger tube bodies 7 does not encounter different resistance when passing through the same nozzle base 2 and the same spiral guide column 1, it can maintain a uniform swirling speed after passing through the partition 4, which makes the scraping efficiency of dirt and ice crystals on multiple heat exchanger tube bodies 7 comparable, thus extending the service life of the fluidized bed heat exchanger.

[0044] To further improve the scraping effect of dirt and ice crystals, in another preferred embodiment of the present invention, such as Figure 3As shown, the spacer can also be a three-part spacer 12, each spacer 12 covering and connected to one of the three discharge holes 11. Each spacer 12 includes multiple arc-shaped parts, with both ends of each arc-shaped part connected to the discharge hole 11. The spacing between two adjacent arc-shaped parts is smaller than the particle size of the stainless steel particles 8. It should be noted that the spacer 12 and the spiral guide column 1 can be an integral structure, or they can be detachably connected.

[0045] After the liquid flows through the spiral guide column 1, its velocity is relatively high. The spacer is subjected to long-term impact, making it prone to damage. This affects the formation of the vortex, the uniformity of scraping away fouling and ice crystals inside the heat exchanger tube body 7, and the uniformity of scraping away fouling and ice crystals inside different heat exchanger tube bodies 7. To further improve the scraping effect of fouling and ice crystals and extend the service life of the spacer, in another preferred embodiment of the present invention, such as... Figure 4 As shown, the spacer can also be a reinforcing spacer 13, which includes multiple concentric rings and Y-shaped parts of different diameters, and the multiple concentric rings and Y-shaped parts can be integrally formed. The middle part of the Y-shaped part is fixedly connected to the center of the spiral guide column 1, and the outermost ends of the three branches of the Y-shaped part are located on the ring with the largest diameter. The multiple concentric rings are arranged along the same circular axis as the spiral guide column 1. The outer diameter of the ring with the largest diameter is not less than the outer diameter of the spiral guide column 1. It should be noted that the Y-shaped part does not constitute a limitation of the present invention; it can also be a cross-shaped part, etc. In the reinforcing spacer 13, the distance between two adjacent concentric rings is less than the particle size of the stainless steel particles 8.

[0046] The aforementioned nozzle assembly for fluidized bed heat exchanger tubes, including a spiral guide column 1, a nozzle base 2, a feed inlet 3, a spacer, an external nozzle thread 5, and a handle 6, can all be manufactured in one piece using methods such as plastic injection molding, metal casting, or 3D printing. After manufacturing, the spiral guide column 1 can be inserted into the heat exchanger tube body 7 from its bottom end. When the top of the external nozzle thread 5 reaches the bottom of the thread on the heat exchanger tube body 7, the handle 6 is rotated to complete the installation of the nozzle assembly for the fluidized bed heat exchanger tubes, resulting in a fluidized bed heat exchanger tube containing the nozzle assembly.

[0047] The method of using the fluidized bed heat exchanger tube containing the nozzle assembly is as follows:

[0048] The feed liquid enters the heat exchange pipe body 7 from the feed port 3. The feed liquid first passes through the nozzle base 2 from the three feed ports 3, and then forms three spiral flows along the spiral channels 9 of the spiral flow guide column 1 and enters the heat exchange pipe body 7 through the spacers. The particles in the heat exchange pipe body 7 are uniformly distributed on the inner surface of the heat exchange pipe body 7 (i.e. most of the particles are concentrated at the position of the inner wall of the pipe, and less distributed at the position of the axis of the heat exchange pipe) under the action of the hydrodynamic force, centrifugal force and gravity of the feed liquid, and rotate around the axis of the heat exchange pipe body 7 under the action of the centrifugal force of the spiral flow. And, under the combined action of the pushing force of the water flow, centrifugal force, gravity, mutual collision with other stainless steel particles 8, and collision with the inner wall of the heat exchange pipe body 7, the stainless steel particles 8 make irregular motion around the heat exchange pipe in the heat exchange pipe body 7, thereby realizing frequent collision and scraping of the particles with the wall surface of the heat exchange pipe body 7, constantly destroying and disturbing the stagnant layer formed by the feed liquid at the boundary of the heat transfer surface, preventing the deposition of dirt and strengthening the heat transfer effect in the field of scale prevention, preventing the deposition of ice crystals and strengthening the heat transfer effect in the field of cold seawater desalination.

[0049] By installing spacers at the top end of the spiral flow guide column 1, the resistance to upward movement of the feed liquid when starting the fluidized bed heat exchanger is reduced, so that spiral flow motion can be formed in the heat exchange pipe body 7. In addition, since the feed liquid entering the heat exchange pipe body 7 from each feed port 3 is not subjected to uneven resistance when passing through the nozzle base 2 and the spiral flow guide column 1, it can maintain uniform rotational flow speed after passing through the spacers, so that the scraping effect of dirt and ice crystals in each direction of the inner wall of a single heat exchange pipe body 7 is equivalent; similarly, since the feed liquid entering different heat exchange pipe bodies 7 is not subjected to different resistance when passing through the same nozzle base 2 and the same spiral flow guide column 1, it can maintain uniform rotational flow speed after passing through the spacers, so that the scraping efficiency of dirt and ice crystals of multiple heat exchange pipe bodies 7 is equivalent, prolonging the service life of the fluidized bed heat exchanger.

[0050] Example 1

[0051] The embodiment relates to a nozzle assembly for a fluidized bed heat exchange pipe and a fluidized bed heat exchange pipe comprising the nozzle assembly, which comprises a spiral flow guide column 1, a nozzle base 2, a feeding port 3, a reinforcing spacer 13, a nozzle outer thread 5 and a handle 6. The nozzle assembly is made of nylon and is integrally formed by one-time injection molding. The spiral flow guide column 1 is in a three-spiral structure, has a height of 100 mm, an outer diameter of 48.5 mm, a spiral rotation number of 0.5 and a taper of 0. The nozzle base 2 is a cylinder, has a diameter of 50 mm and a height of 10 mm. Three semicircular feeding ports 3 are arranged at the edges of the nozzle base 2, have a radius of 15 mm and are uniformly arranged along the center line of the nozzle base 2 at an angle of 120. The reinforcing spacer 13 is arranged at the upper end of the spiral flow guide column 1 and comprises three concentric rings and a Y-shaped piece. The three concentric rings have radii of 13.5 mm, 17.5 mm and 21.5 mm from inside to outside, and each ring has a wall thickness of 1 mm. The nozzle outer thread 5 is arranged on the outer edge surface of the nozzle base 2 and is a pipe thread, has a thread diameter of G1 3 / 4 and a thread length of 10 mm. The handle 6 is arranged at the center of the bottom of the nozzle base 2 and is a cuboid, has a length of 15 mm, a width of 3 mm and a height of 10 mm.

[0052] The heat exchange pipe body 7 has an inner diameter of 50 mm, a length of 600 mm and a wall thickness of 3.5 mm. The heat exchange pipe body 7 is provided with a heat exchange pipe inner thread at the bottom, the heat exchange pipe inner thread is a pipe thread, has a thread diameter of G1 3 / 4 and a thread length of 10 mm. The heat exchange pipe body 7 is connected with the nozzle assembly through the pipe thread. 400 cylindrical stainless steel particles 8 are preloaded in the heat exchange pipe, the height of the stainless steel particles 8 is 8 mm and the diameter is 4 mm.

[0053] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the description of the present application, unless otherwise stated, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0055] The above technical solution is only one embodiment of the present application, and for those skilled in the art, on the basis of the disclosed principles, various types of improvements or modifications can be easily made, and the technical solution described in the above specific embodiments is not limited. Therefore, the above description is only preferred, and is not limited in meaning.

Claims

1. A nozzle assembly for a fluidized bed heat exchanger tube, characterized in that: include The nozzle base is connected to the bottom end of the heat exchange tube body; the nozzle base is provided with multiple feed inlets; A spiral guide column is connected to the top surface of the nozzle base; the spiral guide column is provided with multiple spiral channels; A spacer covers the top surface of the spiral guide column; the spacer includes multiple groups of spacers, each group of spacers covering multiple discharge holes at the upper end of the spiral guide column; each group of spacers includes multiple arc-shaped parts, each arc-shaped part having both ends connected to the discharge hole, and the spacing between two adjacent arc-shaped parts is smaller than the particle size of the stainless steel particles. The number of feed inlets is the same as the number of spiral channels, and the positions of the feed inlets and spiral channels correspond to each other.

2. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The spacer is replaced by a plurality of concentric rings and a Y-shaped component of different diameters. The plurality of concentric rings are coaxially arranged with the spiral guide column. The middle part of the Y-shaped component is fixedly connected to the center of the spiral guide column, and the outermost ends of the three branches of the Y-shaped component are all located on the ring with the largest diameter. The distance between two adjacent concentric rings is less than the particle size of the stainless steel particles.

3. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The spacer is detachably connected to the spiral guide column.

4. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The nozzle base is provided with 2 to 6 feed ports at equal intervals, and the feed ports are located on the outermost side of the bottom end of the nozzle base; The spiral guide column can be any one of a double spiral structure, a triple spiral structure, a quadruple spiral structure, a quintuple spiral structure, or a hexaspiral structure.

5. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The outer diameter of the spiral guide column is 1 / 2 to 1 / 2 of the outer diameter of the nozzle base.

6. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The cross-sectional shape of the feed inlet is approximately elliptical, and the minor axis of the feed inlet is 1 / 2 to 1 / 2 of the radius of the nozzle base.

7. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The nozzle base is detachably connected to the heat exchange tube body.

8. The nozzle assembly for fluidized bed heat exchanger tubes according to claim 1, characterized in that: The nozzle base is equipped with a handle at the bottom.

9. A fluidized bed heat exchanger tube, characterized in that: It includes a heat exchange tube body and a nozzle assembly for a fluidized bed heat exchange tube as described in any one of claims 1 to 8, wherein the nozzle assembly for a fluidized bed heat exchange tube is disposed at the lower end of the heat exchange tube body.

10. A fluidized bed heat exchanger, characterized in that: It includes two tube sheets and a plurality of fluidized bed heat exchange tubes as described in claim 9, wherein the two ends of the plurality of fluidized bed heat exchange tubes are respectively disposed in the two tube sheets.

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