Spray head assembly for fluidized bed heat exchange tube, fluidized bed heat exchange tube and fluidized bed heat exchanger

Abstract

The invention provides a spray head assembly for a fluidized bed heat exchange tube. The spray head assembly comprises a spray head base, a spiral flow guide column and a spacer. The nozzle base is connected to the bottom end of the heat exchange tube body and is provided with a plurality of feed ports; the spiral flow guide column is connected to the top face of the nozzle base and provided with a plurality of spiral channels. The spacer covers the top surface of the spiral flow guide column; the hole diameter of the spacer is smaller than the particle size of the stainless steel particles; wherein 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. The distance piece is arranged at the top end of the spiral flow guide column, so that the upward movement resistance of feed liquid when the fluidized bed heat exchanger is started is reduced, and spiral rotational flow can be formed in the heat exchange pipe. Besides, the feed liquid entering the heat exchange tubes from the feed ports is not subjected to non-uniform resistance when penetrating through the nozzle base and the spiral flow guide column, and the feed liquid entering different heat exchange tubes is not subjected to different resistances, so that the scraping effect of dirt and ice crystals on the inner wall of a single heat exchange tube in all directions and the scraping effect of the dirt and the ice crystals on a plurality of heat exchange tubes are equivalent.

Description

Technical Field

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

[0002] As the country's environmental protection requirements continue to increase, industries such as papermaking, petrochemicals, printing and dyeing, and coal chemical industry need to minimize and harmlessly treat wastewater generated during the production process to reduce pollution and protect the ecological environment. However, the above industrial wastewater generally has the characteristics of high salt content, high hardness, high viscosity, and complex organic components. During the conventional evaporation and concentration process, dirt is easily generated and adheres to the wall of the heat exchange tube, resulting in a sharp increase in the thermal resistance of the heat exchange tube and a decrease in heat transfer efficiency to 1 / 2 to 1 / 3 of the original. This will not only cause a large amount of energy waste, but also require the heat exchange tube to be frequently shut down for cleaning, and it is impossible to achieve efficient and continuous operation of the wastewater treatment system.

[0003] In response to the above problems, both at home and abroad, heat exchange equipment with online self-cleaning capabilities are generally developed. Among them, fluidized bed is a heat exchange equipment that realizes self-cleaning capabilities. Its working principle is to use the kinetic energy of the heat transfer liquid's own flow to drive the cleaning elements (such as particles, springs, etc.) in the heat exchange equipment to achieve automatic cleaning and scale prevention of the heat exchange surface. At the same time, the boundary retention layer of the heat exchange surface is continuously disturbed to achieve enhanced heat exchange, thereby achieving the purpose of efficient energy saving and continuous operation of the heat exchange equipment.

[0004] The above-mentioned self-cleaning heat exchangers mostly use dispersed fluidized beds, that is, the particles are evenly distributed in the entire fluidized bed under the action of the fluid, and the bed expands evenly as the flow rate increases, and the porosity in the bed increases evenly. Although this type of fluidized bed can prevent dirt deposition and enhance heat exchange, most of the particles in the vertical heat exchange tubes are doing ineffective movement, and the kinetic energy and frequency of the particles hitting the wall of the heat exchange tube are relatively limited, resulting in low descaling efficiency of the dispersed fluidized bed heat exchanger. When dealing with the evaporation of wastewater with large heat transfer temperature difference, high water hardness, and high concentration ratio, as the use time of the heat exchange equipment increases, scaling will slowly form on the heat exchange wall, causing the heat exchange equipment to eventually fail.

[0005] In addition, the same problem also exists in the field of seawater desalination. Today, the shortage of freshwater resources has become a global problem, and seawater desalination is an important way to solve the shortage of freshwater resources. Seawater freezing desalination has many advantages such as low process energy consumption, low tendency to corrosion and scaling at low seawater temperatures, low equipment investment cost, and no need for seawater pretreatment and chemicals. It is a seawater desalination technology with development potential. However, the freezing desalination process generally has the problems of low heat transfer efficiency and ice on the heat exchange wall in low temperature environments, which ultimately leads to seawater freezing pipes and reduced ice making efficiency or failure.

[0006] In view of the above reasons, a new type of nozzle assembly for fluidized bed heat exchange tubes is developed, especially for using nozzles to enhance the heat transfer of wastewater or seawater in the heat exchange tubes in a fluidized manner (that is, by continuously disturbing the liquid in the laminar state of the inner wall of the heat transfer tube by particles, the effect of enhancing the heat exchange between the liquid and the heat transfer tube wall is achieved), so as to effectively increase the kinetic energy and frequency of particles hitting the wall of the heat exchange tube, significantly enhance the online descaling ability and heat exchange capacity and heat transfer efficiency of the heat exchanger, thereby ensuring the stable operation of the wastewater heating evaporation process and the freezing seawater desalination process, ensuring the continuous and efficient operation of the system, and reducing the operation and maintenance costs of wastewater treatment and seawater desalination, which has become a technical problem that needs to be urgently solved by technical personnel in this field.

[0007] CN113599858A discloses a cyclonic fluidized bed cooling crystallization system, wherein a heat transfer tube comprises a heat transfer tube body, a filter screen is arranged at the lower end of the heat transfer tube body, a spiral nozzle is arranged above the filter screen, and scraping particles are arranged between the spiral nozzle and the interception net. However, in actual application, when the fluidized bed heat exchanger is started, it is found that a cyclone cannot be formed in some heat exchange tubes, resulting in a significant reduction in the scraping efficiency of dirt and ice crystals; and even if a cyclone is formed in the heat exchange tube, on the one hand, the flow rates of the cyclones in different spiral channels in the same heat exchange tube are different, and the scraping uniformity in a single heat exchange tube cannot be ensured; on the other hand, the flow rates of the cyclones in multiple heat exchange tubes of the fluidized bed heat exchanger are different, resulting in different scraping efficiencies of dirt and ice crystals in multiple heat exchange tubes, and the uniformity between multiple heat exchange tubes cannot be guaranteed, shortening the service life of the fluidized bed heat exchanger. Summary of the invention

[0008] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art, namely, when the fluidized bed heat exchanger is started, a vortex cannot be formed in some heat exchange tubes, and the scraping uniformity in a single heat exchange tube and between multiple heat exchange tubes cannot be guaranteed. Specifically, a new type of fluidized bed heat exchange tube nozzle assembly is provided. By installing a spacer at the top of the spiral guide column, it is ensured that the slurry forms a spiral vortex movement in the heat exchange tube. In addition, the scraping efficiency of dirt and ice crystals in all directions on the inner wall of a single heat exchange tube can be made equivalent, and the scraping efficiency of dirt and ice crystals in multiple heat exchange tubes can be made equivalent, thereby extending the service life of the fluidized bed heat exchanger.

[0009] The present invention is achieved through the following technical solutions:

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

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

[0012] A spacer covering the top surface of the spiral guide column; the hole diameter of the spacer is smaller than the particle diameter of the stainless steel particles;

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

[0014] In a preferred embodiment of the present invention, the nozzle assembly for the fluidized bed heat exchange tube also includes a reinforcement member connected to the spacer; the reinforcement member includes a plurality of concentric rings and a Y-shaped member of different diameters, and the plurality of concentric rings are coaxially arranged with the spiral guide column; the middle part of the Y-shaped member is fixedly connected to the center of the spiral guide column, and the outermost ends of the three branches of the Y-shaped member are all arranged on the ring with the largest diameter.

[0015] In a preferred embodiment of the present invention, the spacer is detachably connected to the spiral guide column.

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

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

[0018] The spiral guide column is any one of a double helix structure, a triple helix structure, a quadruple helix structure, a pentahelix structure or a hexahelix structure.

[0019] In a preferred embodiment of the present invention, the outer diameter of the spiral guide column is 1 / 2 to 1 of the outer diameter of the nozzle base.

[0020] In a preferred embodiment of the present invention, the cross-sectional shape of the feed port is elliptical, and the short axis of the feed port is 1 / 2 to 1 of the radius of the nozzle base.

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

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

[0023] The second object of the present invention is to provide a fluidized bed heat exchange tube including a nozzle assembly for a fluidized bed heat exchange tube according to one of the objects of the present invention. The fluidized bed heat exchange tube includes a heat exchange tube body and a nozzle assembly for a fluidized bed heat exchange tube according to one of the objects of the present invention, and the nozzle assembly for the fluidized bed heat exchange tube is arranged at the lower end of the heat exchange tube body.

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

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

[0026] (1) The nozzle assembly for fluidized bed heat exchange tubes of the present invention reduces the resistance to the upward movement of the feed liquid when starting the fluidized bed heat exchanger by installing a spacer at the top of the spiral guide column, so that the feed liquid can form a spiral swirl movement in the heat exchange tube. In addition, since the feed liquid entering the heat exchange tube from each feed inlet does not encounter uneven resistance when passing through the nozzle base and the spiral guide column, it can maintain a uniform swirl speed after passing through the spacer, which can make the scraping effect of dirt and ice crystals on the inner wall of a single heat exchange tube in all directions equivalent; similarly, since the feed liquid entering different heat exchange tubes does not encounter different resistance when passing through the same nozzle base and the same spiral guide column, it can maintain a uniform swirl speed after passing through the spacer, which makes the scraping efficiency of dirt and ice crystals in multiple heat exchange tubes equivalent, thereby extending the service life of the fluidized bed heat exchanger.

[0027] (2) The nozzle assembly for fluidized bed heat exchange tubes of the present invention realizes the spiral swirl motion of wastewater liquid and frozen seawater in the heat exchange tubes, and utilizes the centrifugal force of the rotating liquid to drive the particles to be evenly distributed on the inner wall of the heat exchange tubes. The present invention can significantly increase the collision kinetic energy and scraping frequency between the particles and the heat exchange wall surface, thereby improving the anti-fouling ability and heat exchange efficiency of the heat exchange tubes.

[0028] (3) The nozzle assembly for fluidized bed heat exchange tubes of the present invention reduces the disordered movement of particles in the heat exchange tubes, increases the effective collision between the particles and the inner wall of the heat exchange tubes, and improves the descaling or deicing efficiency of the particles in the heat exchange tubes.

[0029] (4) The nozzle assembly for fluidized bed heat exchange tubes of the present invention forces the particles in the fluidized bed to rotate, making it difficult for the particles to gather and agglomerate in the center area of ​​the heat exchange tube under the action of centrifugal force. In addition, due to the guiding effect of the feed port, the fluid impacts the particles to produce directional movement (vortex), and the centrifugal force generated thereby causes the particles to move toward 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 invention can enhance the self-cleaning ability of the heat exchange tube during the wastewater heat exchange process, and can better cope with the wastewater evaporation conditions with large heat exchange temperature difference, high water hardness, and high concentration ratio, thereby expanding the application scope of wastewater treatment and extending the equipment shutdown maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0034] Figure 4 It is a top view of the spiral guide column and the reinforcing spacer 13 in the nozzle assembly for the fluidized bed heat exchange tube of the present invention;

[0035] Figure 5 A three-dimensional diagram of a spiral guide column in a nozzle assembly for a fluidized bed heat exchange tube of the present invention;

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

[0037] In the figure, 1- spiral guide column, 2- nozzle base, 3- feed port, 4- partition, 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 spacer, 13- reinforced spacer. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0039] like Figure 1 As shown, the nozzle assembly for fluidized bed heat exchange tubes of the present invention comprises a spiral guide column 1, a nozzle base 2, a feed port 3 and a spacer. The nozzle assembly for fluidized bed heat exchange tubes is arranged at the lower part of the heat exchange tube body 7. The overall structure of the nozzle base 2 is cylindrical. Preferably, the nozzle base 2 is detachably connected to the heat exchange tube body 7. In a preferred embodiment of the present invention, the outer cylindrical surface of the nozzle base 2 is provided with a nozzle external thread 5, which can be screwed with the internal thread provided on the inner surface of the lower part of the heat exchange tube body 7. It should be noted that the way in which the internal and external threads are screwed together is only an embodiment of the detachable connection between the nozzle base 2 and the heat exchange 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 thread and fix the nozzle assembly for fluidized bed heat exchange tubes with the heat exchange tube body 7 by twisting the handle 6, so that the installation of the nozzle assembly for fluidized bed heat exchange tubes is more convenient.

[0040] The nozzle base 2 is provided with 2 to 6 feed ports 3, and the 2 to 6 feed ports 3 are preferably arranged at equal intervals. Figure 6As shown, the nozzle base 2 is provided with three feed ports 3, but this does not limit the number of the feed ports 3. The technicians can set a suitable number of feed ports 3 on the nozzle base 2 according to the actual situation. The feed ports 3 are connected at the top and bottom of the nozzle base 2. Figure 6 In the embodiment, the cross section of the feed port 3 is an ellipse-like shape composed of two circular arcs and is arranged at the outermost side of the bottom surface of the nozzle base 2. This ellipse-like shape and its position, on the one hand, ensure a certain liquid flux and ensure the scraping effect of dirt and ice crystals; on the other hand, it plays a guiding role, so that the formed vortex is concentrated on the inner wall of the heat exchange tube body 7, thereby improving the scraping effect of dirt and ice crystals. Preferably, the short axis of the feed port 3 is 1 / 2 to 1 of the radius of the nozzle base 2, so as to further ensure the liquid flux and thus ensure the scraping effect of dirt and ice crystals. It should be noted that Figure 6 The fact that the feed port 3 is elliptical does not limit the shape of the feed port 3 , and the feed port 3 may also be processed into an elliptical or hyperbolic feed port 3 , as long as the guiding function and flux of the multiple feed ports 3 meet the preset requirements.

[0041] The top surface of the nozzle base 2 is connected to the spiral guide column 1 (such as Figure 5 As shown), the two can be cast in one piece for easy installation. The spiral guide column 1 is coaxially arranged with the nozzle base 2. The outer diameter of the spiral guide column 1 is smaller than the outer diameter of the nozzle base 2, that is, an annular gap is formed on the outer side of the circumferential surface of the spiral guide column 1 and the inner side of the heat exchange tube body 7 at the same height position, which is convenient for the installation and disassembly of the nozzle base 2 and the spiral guide column 1. In addition, the annular gap can reduce the resistance of the slurry when it moves upward, which is more conducive to the formation of swirl; secondly, it can make the force uniform when entering the spiral channel 9 in the spiral guide column 1 through different feed ports 3, thereby achieving equivalent scraping effect of dirt and ice crystals on the inner wall of a single heat exchange tube in all directions; thirdly, it is more conducive to concentrating the formed swirl on the inner wall of the heat exchange tube body 7, further improving the scraping effect of dirt and ice crystals. Preferably, the outer diameter of the spiral guide column 1 is 1 / 2 to 1 of the outer diameter of the nozzle base 2, which not only ensures a certain liquid flux, but also ensures the scraping effect of dirt and ice crystals. More preferably, the spiral guide column 1 is any one of a double helix structure, a triple helix structure, a quadruple helix structure, a pentahelix structure or a hexahelix structure, and is not limited to Figure 5 It should be noted that the three spiral structures specifically refer to the number of spiral channels 9 in the spiral guide column 1, and the number of spiral channels 9 in the spiral guide column 1 matches the number of the feed ports 3, and the position of the feed ports 3 corresponds to the position of the spiral channels 9 in the spiral guide column 1. Figure 5In the figure, the spiral guide column 1 has three spiral channels 9, the bottom surface of the spiral channel 9 is a feed hole 10, which corresponds to the position of the feed port 3; the top surface of the spiral channel 9 is a discharge hole 11.

[0042] In order to further improve the scraping effect of dirt and ice crystals, in a preferred embodiment of the present invention, the spiral rotation number of the spiral guide column 1 is 0.5 to 1. The matching of the spiral rotation number and the taper facilitates processing on the one hand, and on the other hand, enables the slurry to obtain a more sufficient swirl effect while ensuring the strength of the spiral guide column 1, thereby achieving the purpose of improving the scraping effect of dirt and ice crystals.

[0043] In order to further improve the scraping effect of dirt and ice crystals, in a preferred embodiment of the present invention, the spacer is a partition 4, which is arranged at the top of the spiral guide column 1 (such as Figure 2 As shown). The partition net 4 is detachably connected to the spiral guide column 1, for example, the partition net 4 is connected to the top of the spiral guide column 1 by screws. The hole diameter of the partition net 4 is smaller than the particle size of the stainless steel particles 8. Since the stainless steel particles 8 are easily overlapped and stuck in the feed port 3, especially some special-shaped stainless steel particles 8, a very large flow rate is required to form a vortex when starting the fluidized bed heat exchanger. In severe cases, it is even impossible to start and form a vortex. Moreover, the smaller the short axis and long axis of the feed port 3, the more obvious this jamming situation is. In addition to affecting the start-up of the fluidized bed heat exchanger, since the stainless steel particles 8 in each feed port 3 are arranged differently, the scraping effect of dirt and ice crystals on the inner wall of a single heat exchange tube body 7 in all directions is uneven, and the scraping effect of dirt and ice crystals on multiple heat exchange tube bodies 7 is also uneven. The present invention reduces the resistance to the upward movement of the feed liquid when starting the fluidized bed heat exchanger by installing the partition net 4 at the top of the spiral guide column 1, so that it can form a spiral vortex motion in the heat exchange tube body 7. In addition, since the liquid entering the heat exchange tube body 7 from each feed port 3 does not encounter uneven resistance when passing through the nozzle base 2 and the spiral guide column 1, it can maintain a uniform swirl speed after passing through the partition net 4, which can make the scraping efficiency of dirt and ice crystals on the inner wall of a single heat exchange tube body 7 in all directions equivalent; similarly, since the liquid entering different heat exchange 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 swirl speed after passing through the partition net 4, which makes the scraping efficiency of dirt and ice crystals on multiple heat exchange tube bodies 7 equivalent, thereby extending the service life of the fluidized bed heat exchanger.

[0044] In order to further improve the scraping effect of dirt and ice crystals, in another preferred embodiment of the present invention, Figure 3As shown, the spacer may also be a three-component spacer 12, and the spacers 12 cover the three discharge holes 11 respectively and are connected to the three discharge holes 11. The spacers 12 each include a plurality of arc-shaped pieces, and both ends of each arc-shaped piece are connected to the discharge hole 11. The spacing between two adjacent arc-shaped pieces is less than the particle size of the stainless steel particles 8. It should be noted that the spacer 12 and the spiral guide column 1 may be an integrated structure, or the two may be detachably connected.

[0045] After the feed liquid passes through the spiral guide column 1, the speed is relatively high, and the spacer is subjected to long-term impact and is easily damaged, thereby affecting the formation of swirl, the uniformity of scraping dirt and ice crystals inside the heat exchange tube body 7, and the uniformity of scraping dirt and ice crystals in different heat exchange tube bodies 7. In order to further improve the scraping effect of dirt and ice crystals and extend the service life of the spacer, in another preferred embodiment of the present invention, as Figure 4 As shown, the spacer may also be a reinforced spacer 13, which includes a plurality of concentric rings and Y-shaped parts with different diameters, and the plurality of concentric rings and Y-shaped parts may be integrally formed. Among them, 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 arranged on the ring with the largest diameter. A plurality of concentric rings are arranged coaxially with the spiral guide column 1. Among them, 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 to the present invention, and it may also be arranged as a cross-shaped part, etc. In the reinforced spacer 13, the distance between two adjacent concentric rings is less than the particle size of the stainless steel particles 8.

[0046] The above-mentioned nozzle assembly for fluidized bed heat exchange tube, including spiral guide column 1, nozzle base 2, feed port 3, spacer, nozzle external thread 5, handle 6, can be formed and processed at one time by plastic injection molding, metal casting, 3D printing, etc. After forming, the spiral guide column 1 can be partially inserted into the heat exchange tube body 7 from the bottom end. When the top end of the nozzle external thread 5 reaches the bottom end of the heat exchange tube body 7 thread, the handle 6 is rotated to complete the installation of the nozzle assembly for fluidized bed heat exchange tube, and a fluidized bed heat exchange tube containing the nozzle assembly is obtained.

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

[0048] The feed liquid enters the heat exchange tube body 7 from the feed port 3. The feed liquid first passes through the nozzle base 2 through the three feed ports 3, then forms three spiral vortexes along the spiral channel 9 of the spiral guide column 1 and enters the heat exchange tube body 7 through the spacer. The particles in the heat exchange tube body 7 are evenly distributed on the inner surface of the heat exchange tube body 7 (that is, most of the particles are concentrated on the inner wall of the tube, and less are distributed on the axis of the heat exchange tube) under the action of the centrifugal force of the spiral vortex, and rotate around the axis of the heat exchange tube body 7 under the action of the centrifugal force of the spiral vortex. Moreover, under the driving force of water flow, centrifugal force, own gravity, collision with other stainless steel particles 8, and collision with the inner wall of the heat exchange tube body 7, the stainless steel particles 8 make irregular movement around the heat exchange tube in the heat exchange tube body 7, thereby achieving frequent collision and scraping between the particles and the wall of the heat exchange tube body 7, constantly destroying and disturbing the retention layer formed by the liquid at the boundary of the heat transfer surface, which prevents scale deposition and enhances heat transfer in the field of scale inhibition, and prevents ice crystal deposition and enhances heat transfer in the field of cold seawater desalination.

[0049] By installing a spacer at the top of the spiral guide column 1, the resistance to the upward movement of the feed liquid when starting the fluidized bed heat exchanger is reduced, so that the feed liquid can form a spiral swirl movement in the heat exchange tube body 7. In addition, since the feed liquid entering the heat exchange 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 swirl speed after passing through the spacer, which can make the scraping effect of dirt and ice crystals in all directions of the inner wall of a single heat exchange tube body 7 equivalent; similarly, since the feed liquid entering different heat exchange 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 swirl speed after passing through the spacer, which makes the scraping efficiency of dirt and ice crystals in multiple heat exchange tube bodies 7 equivalent, thereby extending the service life of the fluidized bed heat exchanger.

[0050] Example 1

[0051] The present embodiment relates to a nozzle assembly for a fluidized bed heat exchange tube and a fluidized bed heat exchange tube including the nozzle assembly, including a spiral guide column 1, a nozzle base 2, a feed port 3, a reinforcing spacer 13, a nozzle external thread 5, and a handle 6. The nozzle assembly is made of nylon and is formed by one-time injection molding using a mold, and each component is integrated. The spiral guide column 1 is a triple-helix structure with a height of 100 mm, an outer diameter of 48.5 mm, a spiral turn of 0.5, and a taper of 0°. The nozzle base 2 is a cylinder with a diameter of 50 mm and a height of 10 mm. Three semicircular feed ports 3 are arranged at the edge of the nozzle base 2, and the feed port 3 has a radius of 15 mm, and is evenly arranged at 120° along the center line of the nozzle base 2. A reinforcing spacer 13 is provided at the upper end of the spiral guide column 1. The reinforcing spacer 13 includes three concentric rings and a Y-shaped piece. The radii of the three concentric rings are 13.5 mm, 17.5 mm and 21.5 mm from the inside to the outside, respectively, and the wall thickness of each ring is 1 mm. The nozzle external thread 5 is processed on the outer edge surface of the nozzle base 2. The nozzle external thread 5 is a pipe thread with a thread diameter of G1 3 / 4 and a thread length of 10 mm. A handle 6 is provided at the center of the bottom of the nozzle base 2. The handle 6 is a rectangular parallelepiped with a length of 15 mm, a width of 3 mm and a height of 10 mm.

[0052] The inner diameter of the heat exchange tube body 7 is 50 mm, the length is 600 mm, and the wall thickness is 3.5 mm. The bottom of the heat exchange tube body 7 is provided with an internal heat exchange tube thread, which is a pipe thread with a thread diameter of G1 3 / 4 and a thread length of 10 mm. The heat exchange tube body 7 is connected to the nozzle assembly through a pipe thread. 400 cylindrical stainless steel particles 8 are pre-installed inside the heat exchange tube, with a height of 8 mm and a diameter of 4 mm.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0055] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A nozzle assembly for a fluidized bed heat exchange 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 a plurality of feed ports; A spiral guide column connected to the top surface of the nozzle base; the spiral guide column is provided with a plurality of spiral channels; A spacer covering the top surface of the spiral guide column; the minimum spacing of the spacer is smaller than the particle size of the stainless steel particles; The number of the feed ports is the same as that of the spiral channels, and the positions of the feed ports correspond to those of the spiral channels.

2. The nozzle assembly for fluidized bed heat exchange tube according to claim 1, characterized in that: The spacer comprises a spacer mesh, and the diameter of the mesh holes is smaller than the particle size of the stainless steel particles; or The spacer comprises a plurality of concentric circular rings and a Y-shaped member of different diameters, wherein the plurality of concentric circular rings and the spiral guide column are coaxially arranged; the middle portion of the Y-shaped member is fixedly connected to the center of the spiral guide column, and the outermost ends of the three branches of the Y-shaped member are arranged on the circular ring with the largest diameter; the spacing between two adjacent concentric circular rings is smaller than the particle size of the stainless steel particles; or The spacers include multi-component spacers, and the multiple groups of spacers respectively cover the multiple discharge holes at the upper end of the spiral guide column; each group of spacers includes multiple arc-shaped parts, both ends of each arc-shaped part are connected to the discharge holes, and the distance between two adjacent arc-shaped parts is smaller than the particle size of the stainless steel particles.

3. The nozzle assembly for fluidized bed heat exchange tube 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 exchange tube 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 arranged at the outermost side of the bottom end of the nozzle base; The spiral guide column is any one of a double helix structure, a triple helix structure, a quadruple helix structure, a pentahelix structure or a hexahelix structure.

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

6. The nozzle assembly for fluidized bed heat exchange tube according to claim 1, characterized in that: The cross-sectional shape of the feed port is elliptical, and the short axis of the feed port is 1 / 2 to 1 of the radius of the nozzle base.

7. The nozzle assembly for fluidized bed heat exchange tube 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 exchange tube according to claim 1, characterized in that: A handle is provided at the bottom end of the nozzle base.

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

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

Images