U-bend column heat exchanger and fluidized bed

Abstract

The utility model relates to a fluidized bed of built-in U-shaped bend column tube heat exchanger, and particularly relates to a U-shaped bend column tube heat exchanger and a fluidized bed containing drying, cooling or spray granulation of raw materials, which belongs to the technical field of heat exchange equipment. The utility model relates to a fluidized bed main machine and a U-shaped bend column tube heat exchanger arranged in a fluidized material layer. The U-shaped bend column tube heat exchanger comprises a base plate, a plurality of serpentine tubes arranged at intervals, and a steam pocket connected to each of the ports on the same side of the serpentine tubes. The U-shaped bends on one side of part of the serpentine tubes protrude outward, and the U-shaped bends on the other side of part of the serpentine tubes protrude inward, so that the depths of the U-shaped bends of two adjacent column tubes extending into the bed body are different. The arrangement of the serpentine tubes can reduce the fluidized dead angle at the U-shaped bends away from and / or close to the steam pocket, improve the heat exchange coefficient of the material and the column tube at the U-shaped bends, and supply a greater amount of internal heat source during operation, thereby achieving a more energy-saving and environmentally-friendly effect than the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange equipment, in particular to a U-shaped bend column tube heat exchanger and a fluidized bed for drying, cooling or spray granulating raw materials. BACKGROUND

[0002] Fluidized bed drying technology: the master batch (seed crystal, solid raw material) enters the fluidized bed through the feeding system or manually, and the process air is introduced into the bottom of the fluidized bed to form a specific fluidization on the air distribution net plate of the fluidized bed. The material particles form a specific gradient from the inlet to the outlet, and through different forms of fluidized bed, the function of continuous drying can be realized. The continuous drying equipment can also be used in batch mode. A nozzle is arranged on the fluidized bed to spray liquid raw materials into the fluidized material layer, which can be used for spray granulation and drying of seed crystals. By introducing cold process air, the raw materials can be cooled or cooled and granulated. The fluidized bed also has the function of air separation of the material, and the unqualified fine powder is blown out of the fluidized bed.

[0003] Fluidized bed drying or granulating devices are widely used in the national economy. In order to achieve energy saving effect, built-in heat exchangers become a common configuration technology. Tube heat exchangers and plate heat exchangers are two kinds of heat exchangers. In the fluidized bed, the built-in heat exchanger can be composed of multiple built-in heat exchangers, and in the entire fluidized material layer, the built-in heat exchanger can be arranged or not arranged locally, and the height of the built-in heat exchanger in each section is also different.

[0004] Because in the built-in heat exchanger fluidized bed, most of the heat or cold is provided by the built-in heat exchanger, and the process air provides part of the heat or cold. The larger the area of the built-in heat exchanger arranged in the unit space and the smaller the dead angle between the heat exchangers, the more energy-saving and environmentally friendly the built-in heat exchanger fluidized bed is. The larger the area and the smaller the dead angle between the heat exchangers are in conflict, and the existing technology cannot solve this problem well.

[0005] ZL201822084081.4 patent document relates to an internal heat exchange fluidized bed dryer, combined with the attached Figure 10 The U-shaped bend column tube heat exchanger is adopted, and the upper and lower rows of tubes are arranged in a staggered manner in the plan view. This has the advantages of reducing the influence of the upper and lower rows of tubes on the fluidized material and improving the heat exchange coefficient between the column tubes and the material. After the column tubes pass through the base plate, they are connected with the steam drum outside the bed body. There is an invalid column tube section between the base plate and the steam drum. ZL201822085349.6 patent document relates to an internal heat exchange fluidized bed granulator, which also adopts the form of the built-in heat exchanger in ZL201822084081.4. ZL201020665241.5 patent document relates to a built-in coil heat exchanger, which has the same coil arrangement.

[0006] The built-in heat exchanger, especially the column tube heat exchanger, is arranged in this way, and the existing defects are: the lengths of the two adjacent column tubes are equal, the depths of the U-shaped bends extending into the bed body are the same, and the U-shaped bends away from the steam pocket end and the U-shaped bends close to the steam pocket end, as seen from the figure, there is obviously a smaller fluidization gap at the adjacent U-shaped bends than at the straight sections, that is, there is a fluidization dead angle, and when the heat exchange area is increased, the gap will also be smaller, when the fluidized material layer is working, the fluidization state at the U-shaped bends away from and / or close to the steam pocket end is weaker than at the column tube straight sections, and the two places are more likely to form a fluidization dead angle, causing the heat exchange coefficient to decrease, and the material is likely to be burnt or catch fire, in order to avoid this problem, the distance between the adjacent column tubes is usually enlarged, which reduces the area of the built-in heat exchanger in the fluidized bed and reduces the function of the built-in heat exchanger, and the invalid column tube section between the base plate of the built-in heat exchanger and the steam pocket directly reduces the effective length of the column tube, and when there are some small pieces of material in the bed body, if the size is larger than the gap between the column tubes, the material will not have the opportunity to fall into the air distribution net plate, that is, it will not have the opportunity to reach the discharge port, and the accumulation will also cause fluidization failure or safety risk. SUMMARY

[0007] The purpose of the present application is to provide a U-shaped bend column tube heat exchanger which can be used in a fluidized bed but is not limited thereto, and when arranged in a fluidized bed, the fluidization dead angle at the U-shaped bends away from and / or close to the steam pocket end is reduced, the heat exchange coefficient of the material at the U-shaped bends is improved, the maximum serpentine tube heat exchange area in a unit fluidization space is realized, a larger heat source supply is provided during operation, a more energy-saving and environmentally friendly effect than the prior art is realized, and some block-shaped materials above the column tube heat exchanger can also be discharged from the fluidized bed body and prevented from being stuck between the serpentine tubes.

[0008] The technical solution for achieving the above-mentioned purpose is: a U-shaped bend column tube heat exchanger, comprising a base plate, a plurality of serpentine tubes arranged at intervals, and adjacent two serpentine tubes being on different levels, the serpentine tubes being installed on the base plate and each corresponding to a steam pocket connected between the ports on the same side, characterized in that: one end of a U-shaped bend head on one side or both sides of part of the serpentine tubes protrudes outward to the corresponding side of the U-shaped bend head of another part of the serpentine tubes.

[0009] The serpentine pipes are arranged in the fluidized bed in a horizontal or vertical arrangement, preferably, the U-shaped bends on one side of the serpentine pipes are convex or concave relative to the U-shaped bends on the corresponding side of the adjacent serpentine pipes, and most preferably, the U-shaped bends on one side of each serpentine pipe are convex or concave relative to the U-shaped bends on the corresponding side of the adjacent serpentine pipe. The existence of the convex or concave space area is also conducive to the discharge of small pieces of material above the tube heat exchanger from the fluidized bed body and prevents the small pieces of material from being stuck between the serpentine pipes. In the serpentine pipes, the U-shaped bends of the convex or concave serpentine pipes can be overlapped in the arrangement direction.

[0010] The U-shaped bends on one side or both sides of the serpentine pipes are convex or concave relative to the U-shaped bends on the corresponding side of the other serpentine pipes, thereby reducing the fluidization dead angle at the U-shaped bends at one end of the serpentine pipes away from and / or close to the steam drum, and enabling the U-shaped bends at one end and / or both ends of the serpentine pipes to form a relatively larger gap.

[0011] The serpentine pipes can be arranged in the fluidized bed, and when arranged in the fluidized bed, the fluidization is better, the material to be fluidized can better wash the U-shaped bends, thereby driving the fluidization of the material at the U-shaped bends to be close to or even better than the fluidization degree at the straight sections of the serpentine pipes, thereby improving the heat exchange coefficient of the material at the U-shaped bends and the serpentine pipes, arranging smaller serpentine pipe spacing in a unit fluidization space, achieving a larger serpentine pipe heat exchange area, supplying a larger heat source supply amount during operation, such as using a higher steam pressure, achieving a more energy-saving and environmentally friendly effect than the prior art, solving the shortcomings of the background art, and being conducive to achieving the purpose of the present application. The medium that can be introduced into the steam drum includes heat exchange or cooling medium such as steam, hot oil, and water.

[0012] Further, the convex amount of the U-shaped bends on one side of the serpentine pipes relative to the U-shaped bends on the corresponding side of the other serpentine pipes is 0.5-10 times the outer diameter of the serpentine pipes. Within this range, the purpose of the application can be achieved, and the heat exchange area of the serpentine pipes can be maximized.

[0013] Further, one side of the steam drum is an opening, and the opening end is sealingly connected to the base plate. The ends of the serpentine pipes pass through the base plate at the corresponding steam drum connection positions, so that the internal space of the serpentine pipes communicates with the internal space of the corresponding steam drum. The serpentine pipes are connected to the base plate, and the steam drum connection positions of the base plate become part of the steam drum. The two ends of the serpentine pipes are embedded in the two steam drums, respectively, so that the effective length of the serpentine pipes can be maximized, and the effective length is equal to the total length of the serpentine pipes.

[0014] The steam pocket is open on one side and has a transition plate connected to the open end, the steam pocket is fixedly installed on the base plate through the transition plate, and the end of the serpentine pipe penetrates through the base plate and the transition plate, so that the internal space of the serpentine pipe is communicated with the internal space of the corresponding steam pocket. The transition plate plays a role of local reinforcement and prevents heat from being too quickly transmitted into the inner side of the base plate, thereby preventing the local energy of the fluidized material from being too large.

[0015] Further, the single serpentine pipe comprises a plurality of straight pipes arranged at intervals, and the two adjacent straight pipes are connected end to end through the U-shaped bend, and the two adjacent straight pipes are connected end to end through the U-shaped bend to form a whole and constitute a wave-shaped layer, thereby further reducing the fluidization dead angle and improving the fluidization effect of the material.

[0016] Further, in order to fix the serpentine pipe, avoid the serpentine pipe from shaking in the fluidized material, increase the heat exchange area, and facilitate the stability of the fluidization, the serpentine pipe is fixed by perforation through the hole plate, the serpentine pipes are connected into a whole through the hole plate, the hole plate is provided with a plurality of rows of insertion holes for inserting the serpentine pipes, and the serpentine pipes are inserted into the corresponding rows of insertion holes. Preferably, the hole plate can be composed of multiple pieces, and the hole plates are connected and fixed by using strip steel, so that the hole plate itself plays a role of heat exchange due to the contact with the serpentine pipe, thereby increasing the heat exchange area.

[0017] Further, in order to strengthen the heat exchange effect of the hole plate, a stop block corresponding to part or all of the straight pipes of each serpentine pipe is further connected to the hole plate, and the stop block is close to the corresponding straight pipe, so as to strengthen the contact between the serpentine pipe and the hole plate.

[0018] Preferably, the stop block is above the corresponding straight pipe, and more preferably, the side facing the straight pipe is provided with an arc surface matched with the surface of the pipe body of the serpentine pipe.

[0019] Further, the adjacent serpentine pipes are arranged staggered, and the three adjacent ports on the same side of the serpentine pipe are arranged in a triangular shape in the steam pocket, so that the arrangement spacing between the adjacent serpentine pipes can be reduced, and the straight line distance between the corresponding straight pipes and the bend pipes of the adjacent serpentine pipes is increased under the same arrangement spacing, thereby reducing the influence of the adjacent serpentine pipes on the fluidized material, and more preferably, all the three adjacent ports of the serpentine pipe on the same side in the steam pocket are arranged in a triangular shape. Further, the spacing between the two adjacent serpentine pipes is equal, and the arrangement spacing of the ports of the two adjacent serpentine pipes in the steam pocket is equal, which is beneficial to the manufacturing and implementation in addition to the above purposes. Further, in order to arrange more serpentine pipes, the outer wall of the overlapping part of the adjacent serpentine pipes in the arrangement direction is provided with an inwardly recessed notch, and the notch faces the adjacent serpentine pipe.

[0020] Further, in order to facilitate the disassembly, maintenance and assembly of the U-shaped bend pipe heat exchanger, pulleys and sliding rails matched with each other are arranged on both sides of the heat exchanger, and the base plate is provided with lifting lugs.

[0021] Further, in order to facilitate the appearance and heat preservation of the fluidized bed main machine, the base plate is provided with a heat preservation device, in order to facilitate observation, the base plate is provided with an observation mirror, and in order to facilitate cleaning, the base plate can also be provided with a cleaning hole.

[0022] Another object of the present application is to provide a fluidized bed with a built-in U-bend tube heat exchanger, comprising a fluidized bed main machine and the U-bend tube heat exchanger arranged in the fluidized bed.

[0023] In summary, the fluidized bed device with a built-in U-bend tube heat exchanger provided by the present application can reduce the flow dead angle at the U-bend away from and / or close to the steam pocket end, improve the heat exchange coefficient of the material and the serpentine tube at the U-bend, maximize the serpentine tube heat exchange area in the unit fluidization space, and the effective area of the serpentine tube is equal to the total area of the serpentine tube. When working, more energy sources can be supplied, and the effect of more energy saving, environmental protection and safety than the prior art can be achieved. It is also beneficial to the discharge of some small block-shaped objects above the tube heat exchanger from the fluidized bed body. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of one of the concave-convex arrangements of the U-bend of the serpentine tube end of the U-bend tube heat exchanger; Figure 2 It is a schematic diagram of the most preferred concave-convex arrangement of the U-bend of the serpentine tube end of the U-bend tube heat exchanger;

[0025] Figure 3 It is a main plan view of the serpentine tube;

[0026] Figure 4 It is a schematic diagram of the linear arrangement of the serpentine tube port in the steam pocket;

[0027] Figure 5 It is a schematic diagram of the orifice plate of the present application;

[0028] Figure 6 It is a schematic diagram of a small stop block mounting structure of the present application;

[0029] Figure 7 It is a schematic diagram of a steam pocket of the present application;

[0030] Figure 8 It is a schematic diagram of the structure of the fluidized bed with the U-bend tube heat exchanger;

[0031] Figure 9 It is a schematic diagram of another preferred arrangement structure of the serpentine tube in the U-bend tube heat exchanger;

[0032] Figure 10 It is a schematic diagram of the arrangement structure of the serpentine tube corresponding to the orifice plate; Figure 9 It is a schematic diagram of the arrangement structure of the serpentine tube corresponding to the orifice plate;

[0033] Figure 11 Another arrangement of the serpentine tubes in the steam drum;

[0034] Figure 12 A notch for the tubes at the projection overlap of the adjacent tube rows of the present application;

[0035] Figure 13 A wave-shaped cross-section of the serpentine tube; Figure 3 A wave-shaped cross-section of the serpentine tube; DETAILED DESCRIPTION

[0036] As shown in the drawings, the present application discloses a U-bend tube heat exchanger 3 for arranging in a fluidized bed to heat-dry the material. Figure 1 The U-bend tube heat exchanger 3 comprises a base plate 5 and a plurality of serpentine tubes 4 arranged at intervals, and adjacent two serpentine tubes 4 are at different levels.

[0037] As shown in the drawings, the serpentine tube 4 comprises a plurality of straight tubes 4.2 arranged at intervals, and adjacent two straight tubes 4.2 are connected end to end through a U-bend 4.1, the number of U-bends 4.1 is at least 1, and the number of straight tubes 4.2 is at least 2.When the number of straight tubes 4.2 is greater than or equal to 3, the cross-sectional shape of a single serpentine tube 4 can be in the same plane or in a wave-shaped plane.When the straight tubes 4.2 of a single serpentine tube 4 are in the same plane, the U-bend 4.1 and the straight tube 4.2 of the single serpentine tube 4 are in the same plane. When the cross-section of the straight tube 4.2 of a single serpentine tube 4 is in the same wave-shaped plane, part or all of the adjacent three straight tubes 4.2 form an angle between the two U-bends 4.1, thereby further reducing the fluidization dead angle and improving the fluidization effect of the material. The shape of each wave of the serpentine tube 4 can be consistent or inconsistent, the bend diameter of each U-bend 4.1 can be consistent or inconsistent, and the cross-sectional shape of adjacent serpentine tubes can be consistent or inconsistent. Figure 3 Most preferably, as shown in the drawings, the straight tubes 4.2 are arranged in an upper and lower staggered manner from left to right (perspective view), so that the straight tubes 4.2 form multiple rows arranged in an upper and lower manner.

[0038] The adjacent two straight tubes 4.2 are connected end to end through the U-bend 4.1, so that the two U-bends 4.1 between all adjacent three straight tubes 4.2 form an angle e. Figure 13 Figure 13

[0039] The serpentine pipes 4 are installed on the base plate 5, and each of the same side ports is connected with a steam pocket 6, and one end of the U-shaped bend 4.1 of one side or both sides of the serpentine pipe 4 is outwardly protruding from the corresponding U-shaped bend 4.1 of the other side of the serpentine pipe 4.

[0040] The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4. Figure 1 The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4. Figure 2 The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4.

[0041] The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4.

[0042] The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4. Figure 1 The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4.

[0043] The protruding or recessed structure of the U-shaped bend 4.1 of the serpentine pipe 4 is preferably designed as shown in the figure, that is, the end of the U-shaped bend 4.1 of the same side of the serpentine pipe 4 is flush with the end of the U-shaped bend 4.1 of the same side of the adjacent serpentine pipe 4, and the end of the U-shaped bend 4.1 of the other side of the serpentine pipe 4 is protruding or recessed from the end of the U-shaped bend 4.1 of the other side of the adjacent serpentine pipe 4. Figure 7As shown in the figure, one side of the steam pocket 6 is open, and the open end is connected with a transition plate 22, the steam pocket 6 is fixedly installed on the base plate 5 through the transition plate 22, and the end of the serpentine tube 4 respectively passes through the base plate 5 and the transition plate 22, so that the internal space of the serpentine tube 4 is communicated with the internal space of the corresponding steam pocket 6; preferably, the serpentine tube 4 is sealingly connected with the transition plate 22. The transition plate 22 is used for strengthening and delaying the energy in the steam pocket 6 to act on the inner surface of the base plate 5, further delaying the local influence of the energy in the steam pocket 6 on the materials in the bed body 2, so that the purpose of the application is better achieved.

[0044] As shown in the figure, Figure 4 As shown in the figure, the serpentine tube 4 is arranged in a linear shape in the corresponding steam pocket 6, which is more suitable for the use state of the horizontal arrangement of the steam pocket 6.

[0045] As shown in the figure, Figure 1 , 5 As shown in the figure, in order to fix the serpentine tube 4, avoid the serpentine tube 4 from shaking in the fluidized material, increase the heat exchange area, and be beneficial to the stability of the fluidization, the serpentine tube 4 is fixed by perforation through the perforated plate 14, and the serpentine tubes 4 are formed as a whole through the perforated plate 14.

[0046] Figure 6 It is a schematic view of the perforated plate of the application, the perforated plate 14 is provided with multiple rows of insertion holes, each row includes circular insertion holes 14.1 at both ends, multiple strip-shaped insertion holes 14.2 are arranged between the circular insertion holes 14.1 at both ends, and the two ports of the serpentine tube are inserted into the circular insertion holes 14.1, and the U-shaped bends 4.1 at both ends are respectively inserted into one strip-shaped insertion hole 14.2.

[0047] Preferably, the perforated plate 14 can be adopted in multiple pieces, and the perforated plates 14 are connected and fixed through strip steel, so that the perforated plate 14 itself plays a role of heat exchange area due to the contact with the serpentine tube 4. As shown in the figure, Figure 6 In order to strengthen the role of the perforated plate 14 as the heat exchange area, the perforated plate 14 is further connected with a stop block 15 corresponding to part or all of the straight pipes 4.2 of each serpentine tube 4, the stop block 15 is close to the corresponding straight pipe 4.2, and the contact between the serpentine tube 4 and the perforated plate 14 can be strengthened. More preferably, the stop block 15 is above the corresponding straight pipe 4.2, and more preferably, one side of the stop block 15 facing the straight pipe 4.2 is provided with an arc surface matched with the surface of the corresponding straight pipe 4.2.

[0048] As shown in the figure, Figure 5 In order to facilitate the disassembly and maintenance of the U-shaped bend tube heat exchanger 3, sliding pulleys 17 and sliding rails 16 are arranged on both sides of the U-shaped bend tube heat exchanger 3 and are in sliding cooperation with each other, as shown in the figure, Figure 8 As shown in the figure, the base plate 5 is provided with lifting lugs 18.

[0049] Figure 8As shown, the application also discloses a fluidized bed with built-in U-bend tube heat exchanger, the U-bend tube heat exchanger is in the main machine 1 of the fluidized bed, according to the specific function, the number and arrangement direction of the U-bend tube heat exchanger can be freely arranged, in the embodiment, three groups of U-bend tube heat exchangers 3 are arranged, among which the serpentine pipes 4 of the two groups of U-bend tube heat exchangers 3 on the left are horizontally arranged, that is, the steam drum 6 is vertically arranged, the serpentine pipe 4 of the group of U-bend tube heat exchanger 3 on the right is vertically arranged, that is, the steam drum 6 is horizontally arranged, it is worth mentioning that the steam drum 6 is not necessarily absolutely horizontally or vertically arranged.

[0050] Further, as shown in Figure 9 The bed body 2 is provided with mounting holes, the serpentine pipe 4 of the U-bend tube heat exchanger 3 is inserted and mounted in the bed body 2, the base plate 5 is connected and mounted on the bed body 2 through the bolt 19, and the steam drum 6 is arranged outside the bed body 2. In order to facilitate heat preservation, the base plate 5 is covered with a heat preservation layer 20, in order to facilitate observation, the base plate 5 is provided with an observation sight glass 21, and in order to facilitate cleaning, the base plate 5 can also be provided with a cleaning hole.

[0051] The U-bend 4.1 at one end of the serpentine pipe 4 on the same side is concave or convex relative to the U-bend 4.1 at the corresponding side of the adjacent serpentine pipe, thereby reducing the fluidization dead angle at the U-bend at one end away from and / or close to the steam drum 6, so that the U-bend 4.1 at both ends of the serpentine pipe 4 can form a relatively larger gap, the fluidization can be better, and the fluidized material can better flush the U-bend 4.1, thereby driving the fluidization of the material at the U-bend 4.1 to be close to the same or even better than the fluidization degree at the straight section of the serpentine pipe 4, thereby improving the heat exchange coefficient of the material at the U-bend 4.1 and the serpentine pipe 4, arranging smaller serpentine pipe 4 spacing in a unit fluidization space, realizing larger serpentine pipe 4 heat exchange area, providing larger heat source supply during work, such as using higher steam pressure, realizing more energy-saving and environment-friendly effect than the prior art, and solving the shortcomings of the background art.

[0052] As shown in Figure 9 , 10 , 11, as a further improvement of the embodiment, the serpentine pipe 4 is arranged in the left-right direction Figure 9From a perspective of perspective, a staggered arrangement is also adopted. Multiple rows of insertion holes on the orifice plate 14 are also staggered accordingly, so that the three adjacent ports on the same side of the serpentine tube 4 are arranged in a triangle within the steam drum 6. This reduces the spacing between adjacent serpentine tubes 4. At the same spacing d, the straight-line distance between the corresponding straight and curved pipes of adjacent serpentine tubes increases, thereby reducing the impact of adjacent serpentine tubes 4 on the fluidized material. More preferably, all three adjacent ports on the same side of the serpentine tube 4 within the steam drum 6 form a triangular arrangement. The combined arrangement of the protruding and concave structure of the U-shaped bend 4 in the front-to-back direction and the staggered arrangement to the left and right further facilitates the achievement of the present invention's objectives.

[0053] As a further explanation of this embodiment, Figure 5 , 10 The shape of the socket matches the shape of the serpentine tube 4, meaning that each row of sockets can be either a straight line or a wave.

[0054] Furthermore, such as Figure 4 , 11 As shown, for ease of manufacturing, the spacing d between some adjacent serpentine tubes 4 is equal, and more preferably, the spacing d between all adjacent serpentine tubes 4 is equal.

[0055] This invention can comprehensively adopt various solutions of other existing technologies to achieve better results. The above embodiments are not all embodiments. Each component can be freely selected according to the needs of the actual production line. There are other manifestations and combinations that can also achieve the same effect as this invention. They are equivalent or the same technical means, and will not be listed one by one here.

[0056] In summary, the fluidized bed device with a built-in U-shaped bend tube heat exchanger proposed in this invention can reduce the fluidization dead angle at the U-shaped bend 4.1 far from and / or close to the steam drum end 6, improve the heat transfer coefficient between the material at the U-shaped bend 4.1 and the serpentine tube 4, arrange more serpentine tubes 4 in a unit fluidization space, and the effective area of ​​the serpentine tube 4 is equal to the total area of ​​the serpentine tube 4. During operation, it can supply more heat exchange sources, achieve more energy-saving and environmentally friendly effects than the prior art, and also facilitate the discharge of some blocky objects above the tube heat exchanger from the fluidized bed body 1.

[0057] The terminology used in the above embodiments and arrangements of this invention are all existing technologies.

[0058] Example 2 Figure 12 As shown, in order to arrange more serpentine tubes 4, a concave notch 11 is provided on the outer wall of the overlapping part of the adjacent serpentine tubes 4 along the arrangement direction. The notch 11 faces the adjacent serpentine tube 4. This notch 11 can be provided in some serpentine tubes 4, all serpentine tubes 4, one side of serpentine tubes 4, or both sides of serpentine tubes 4.

Claims

1. A fluidized bed with built-in U-bend shell-and-tube heat exchanger, comprising a fluidized bed main machine and a U-bend shell-and-tube heat exchanger arranged in the fluidized bed, the U-bend shell-and-tube heat exchanger comprising a base plate, a plurality of serpentine tubes arranged at intervals, two adjacent serpentine tubes being at different levels, the serpentine tubes being mounted on the base plate and each corresponding to one steam pocket connected between ports on the same side, the serpentine tubes being staggered in the left-right direction so that some or all of the three adjacent ports on the same side of the serpentine tubes are arranged in a triangle in the steam pocket. characterized in that The serpentine tubes are fixed by perforating with a hole plate, the serpentine tubes are formed into a whole through the hole plate, and one end of the U-bend on one side or both sides of part of the serpentine tubes protrudes outward in the front-back direction to the U-bend on the corresponding side of another part of the serpentine tubes.

2. A fluidized bed of a built-in U-bend shell-and-tube heat exchanger according to claim 1, characterized in that: The protrusion of one end of the U-bend on one side of part of the serpentine tubes relative to the U-bend on the same side of other part of the serpentine tubes is 0.5-10 times the outer diameter of the serpentine tube.

3. The fluidized bed of claim 1, wherein: One side of the steam pocket is open and the open end is sealingly connected to the base plate, and the ends of the serpentine tubes pass through the base plate at the corresponding steam pocket connection position, so that the internal space of the serpentine tube is communicated with the internal space of the corresponding steam pocket.

4. The fluidized bed of claim 1, wherein: One side of the steam pocket is open and the open end is connected to a transition plate, and the steam pocket is fixedly installed on the base plate through the transition plate, and the ends of the serpentine tubes pass through the base plate and the transition plate, so that the internal space of the serpentine tube is communicated with the internal space of the corresponding steam pocket.

5. The fluidized bed of claim 1, wherein: A single serpentine tube comprises a plurality of straight tubes arranged at intervals, two adjacent straight tubes are connected end to end to form a whole through a U-bend and constitute a wave-shaped level.

6. A fluidized bed of an inline U-bend shell and tube heat exchanger according to claim 5, characterized in that: A plurality of stop blocks corresponding to part or all of the straight tubes of each serpentine tube are connected to the hole plate, and the stop blocks are close to the corresponding straight tubes.

7. The fluidized bed of an inline U-tube heat exchanger according to claim 1, wherein: A plurality of rows of insertion holes are provided on the hole plate, and the plurality of rows of insertion holes are arranged according to the staggered arrangement of the serpentine tubes, each row comprising circular insertion holes at both ends, a plurality of strip-shaped insertion holes being provided between the circular insertion holes at both ends, and the ports of the serpentine tube at both ends being inserted into the circular insertion holes, and the ends of the U-bend between the two ports being inserted into a strip-shaped insertion hole corresponding to each end.

8. The fluidized bed of an inline U-tube heat exchanger according to claim 1, wherein: The distance between part of the adjacent serpentine tubes is equal, and the distance between the ports of part of the adjacent serpentine tubes in the steam pocket is equal.

9. The fluidized bed of claim 1, wherein: An inner recessed notch is provided on the outer wall of the overlapping part of the adjacent serpentine tubes in the arrangement direction, and the notch faces the adjacent serpentine tube.

10. A fluidized bed of an inline U-bend shell and tube heat exchanger according to claim 6, characterized in that The stop block is above the corresponding straight tube, and the side facing the straight tube is provided with a surface matched with the surface of the tube body of the serpentine tube.

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