A fluidized bed circulating air cooling system

Abstract

The present invention discloses a fluidized bed circulating air cooling system, comprising a fluidized bed, a compensating air duct, a primary sorting device, a secondary sorting device, a main fan, an air distribution box and a circulating fan, wherein the fluidized bed is connected to one end of the circulating fan through a pipeline, the other end of the circulating fan is connected to the air distribution box, and the air distribution box is connected to the fluidized bed, the primary sorting device, the secondary sorting device and the compensating air duct are all connected between the fluidized bed and the air distribution box, the fluidized bed is connected to one end of the main fan through an air chamber, and the other end of the main fan is connected to the air distribution chamber and the fluidized bed; a filter is installed on the fluidized bed, a first radiator is installed on the fluidized bed, and a second radiator is installed above the filter. The present invention adds built-in heat exchangers at multiple locations within the entire circulating air system, greatly improving the system's cooling capacity; and turbocharging technology is used to further reduce the air duct temperature while increasing the circulation system pressure to ensure process pressure requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco machinery and equipment, and particularly relates to a fluidized bed circulating air cooling system. Background Art

[0002] The fluidized bed is a general term for all systems in the cigarette making machine's feeding and strip-forming machine that transports tobacco into the wind chamber to form tobacco rods. The transportation and strip formation of tobacco are controlled by airflow, the blowing of tobacco is completed by the fluidized bed, and the adsorption of tobacco into strips in the wind chamber is completed by a negative pressure fan. Chinese Patent 202110276168.5 discloses a new fluidized bed airflow cooling control system and control method. The main technical feature of this patent is to change the original circulating air internal circulation system to an open-loop design. The air entering the fluidized bed is the ambient air with constant temperature and humidity in the workshop. The exhaust air from the fan enters the centralized dust removal system through a pipe. In theory, the internal temperature of the fluidized bed is only slightly higher than the ambient air. During operation, the internal temperature of the fluidized bed does not exceed 35 degrees.

[0003] However, the above solution has the following problems during use: (1) The structure and principle of the circulation system have been greatly changed, which has a certain impact on the stability of the wind system and the effect of stem separation; (2) The open-loop fan flow is large, which has a great impact on the workshop air-conditioning system. When using this device, the workshop air-conditioning capacity must be guaranteed. Summary of the Invention

[0004] The purpose of the present invention is to provide a fluidized bed circulating air cooling system, which can meet the cooling requirements of various domestic speed winder units on the basis of maintaining a closed-loop circulating air system, with minor modifications and stable wind power.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a fluidized bed circulating air cooling system, comprising a fluidized bed, a compensating air duct, a primary sorting device, a secondary sorting device, a main fan, an air distribution box and a circulating fan, wherein the fluidized bed is connected to one end of the circulating fan through a pipeline, the other end of the circulating fan is connected to the air distribution box, and the air distribution box is connected to the fluidized bed, the primary sorting device, the secondary sorting device and the compensating air duct are all connected between the fluidized bed and the air distribution box, the fluidized bed is connected to one end of the main fan through an air chamber, and the other end of the main fan is connected to the air distribution chamber and the fluidized bed; a filter is installed on the fluidized bed, and the characteristic is that a first radiator is installed on the fluidized bed, and a second radiator is installed above the filter.

[0006] Furthermore, the above-mentioned fluidized bed circulating air cooling system, wherein the first radiator includes cooling fins, a cooling base plate and a cover plate, the cooling fins are provided with multiple pieces, the cooling fins are installed on the cooling base plate, the bottom of the cooling base plate is provided with two first radiator connectors for connecting the condensate and two ventilation pipe openings, the cover plate is provided with through holes, each first radiator connector and ventilation pipe opening corresponds to the position of the through holes, the first radiator connector and ventilation pipe opening pass through the through holes of the cover plate, so that the cover plate is connected to the bottom of the cooling base plate.

[0007] Furthermore, in the above-mentioned fluidized bed circulating air cooling system, a groove is provided at the bottom of the fluidized bed, and the whole formed by the various heat dissipation fins of the first radiator is completely inserted into the groove at the bottom of the fluidized bed, and the cover plate is located at the bottom of the fluidized bed.

[0008] Furthermore, the above-mentioned fluidized bed circulating air cooling system, wherein the second radiator includes a frame, a partition plate and heat dissipation fins, one side edge of the frame is recessed inward to form a notch, the two ends of the partition plate are respectively connected to the opposite sides of one side of the frame, the other opposite side of the frame is spaced apart from the two partition plates on the outside, each partition plate is distributed in a grid shape, the heat dissipation fins are connected between the partition plate and the opposite side of the other side of the frame and between each partition plate, and the frame is provided with a second radiator connector for connecting the condensate.

[0009] Furthermore, in the above-mentioned fluidized bed circulating air cooling system, ventilation holes are formed between each of the heat dissipation fins, and the aperture of the second radiator is larger than the aperture of the filter.

[0010] Furthermore, in the above-mentioned fluidized bed circulating air cooling system, a third radiator is installed at the compensation air duct.

[0011] Furthermore, in the above-mentioned fluidized bed circulating air cooling system, a fourth radiator is installed in the primary sorting device, and a fifth radiator is installed in the secondary sorting device.

[0012] Furthermore, in the above-mentioned fluidized bed circulating air cooling system, the third radiator includes a frame, heat dissipation fins and a partition plate, and there are multiple partition plates. The two ends of the partition plates are respectively connected to the opposite sides of one side of the frame, and the opposite sides of the other side of the frame are separated from the two partition plates on the outside. Each partition plate is distributed in a grid shape, and the heat dissipation fins are connected between the intervals between the partition plates and the opposite sides of the other side of the frame and between each partition plate. One side edge of the frame extends outward to form an extension portion, and the extension portion is provided with a third radiator interface for connecting the condensate.

[0013] Furthermore, in the above-mentioned fluidized bed circulating air cooling system, the fourth radiator and the fifth radiator include a rod body and heat dissipation fins, the rod body is cylindrical, the heat dissipation fins are annular sheet structures, and each heat dissipation fin is sleeved on the rod body.

[0014] Furthermore, the above-mentioned fluidized bed circulating air cooling system, wherein a vortex tube is installed at the inlet of the circulating fan, and the vortex tube includes a vortex tube body, a screw and an air inlet pipe, and a first opening and a second opening are formed at both ends of the vortex tube body respectively, the first opening is connected to the inlet of the circulating fan, a vortex cavity is formed in the vortex tube body, the screw is placed in the vortex cavity, the air inlet pipe is vertically connected to the vortex tube body, and the air inlet pipe is connected to the first opening.

[0015] The essential features and significant technological advancements of the present invention are as follows: (1) The present invention adds built-in heat exchangers on the upper portion of the fluidized bed filter, on the fluidized bed, inside the primary air separation device, inside the secondary air separation device, and in the compensation air duct within the entire circulating air system, rather than the local separate heat exchange in the prior art, thereby greatly improving the system's cooling capacity; (2) The present invention adopts a vortex tube and uses compressed air as a power source to generate spiral rotation in the vortex cavity, resulting in the separation of the outer hot air flow and the central cold air flow, and then introduces the cold air flow into the circulating fan inlet to supplement a small amount of low-temperature compressed air. While further reducing the air duct temperature, the turbocharging technology is used to increase the circulation system pressure to ensure the process pressure requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0017] Figure 2 It is an external schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the installation of the fluidized bed and the first radiator of the present invention;

[0019] Figure 4 is a schematic diagram of a first radiator of the present invention;

[0020] Figure 5 is a schematic diagram of a second radiator of the present invention;

[0021] Figure 6 is a schematic diagram of a third radiator of the present invention;

[0022] Figure 7 is a schematic diagram of the fourth and fifth radiators of the present invention;

[0023] Figure 8 Schematic diagram of a vortex tube.

[0024] In the figure: 1, fluidized bed; 11, first radiator; 111, cooling fins; 112, cooling base plate; 113, cover plate; 114, first radiator connector; 115, ventilation pipe opening; 2, filter screen; 21, second radiator; 211, frame; 212, notch; 213, partition plate; 214, cooling fins; 215, second radiator connector; 3, compensation air duct; 31, third radiator; 311, frame; 312, cooling fins; 31 3. Extension portion; 314. Third radiator interface; 4. Primary sorting device; 41. Fourth radiator; 411. Rod body; 412. Heat dissipation fins; 5. Secondary sorting device; 51. Fifth radiator; 6. Main fan; 61. Main fan connecting pipe; 7. Air distribution box; 8. Circulating fan; 9. Cyclone dust collector; 10. Vortex tube; 101. Vortex tube body; 102. Screw; 103. Air inlet pipe; 104. First opening; 105. Second opening. DETAILED DESCRIPTION

[0025] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0026] Please also refer to Figures 1 to 8 The fluidized bed circulating air cooling system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, the fluidized bed circulating air cooling system of the present invention includes a fluidized bed 1, a compensation air duct 3, a primary sorting device 4, a secondary sorting device 5, a main fan 6, a main fan connecting pipe 61, an air distribution box 7 and a circulating fan 8. The fluidized bed 1 is connected to one end of the circulating fan 8, and the other end of the circulating fan 8 is connected to the air distribution box 7, and the air distribution box 7 is connected to the fluidized bed 1. The primary sorting device 4, the secondary sorting device 5 and the compensation air duct 3 are all connected between the fluidized bed 1 and the air distribution box 7. Figure 1 Taking the viewing angle as a reference, the compensating air duct 3 is located at the upper right of the fluidized bed 1. The fluidized bed 1 is connected to one end of the main fan 6 through the wind chamber, and the other end of the main fan 6 is connected to the air distribution chamber 7 and the fluidized bed 1; a filter screen 2 is installed on the fluidized bed 1, a first radiator 11 is installed in the fluidized bed 1, a second radiator 21 is installed above the filter screen 2, a third radiator is installed at the compensating air duct 3, a fourth radiator and a fifth radiator are installed inside the primary sorting device 4 and the secondary sorting device 5 respectively, a vortex tube 10 is installed at the inlet of the circulating fan 8, and a cyclone dust collector 9 is provided on the connecting pipeline between the circulating fan 8 and the fluidized bed 1.

[0028] Specifically, such as Figure 3 and Figure 4As shown, the first radiator 11 includes heat dissipation fins 111, a heat dissipation base plate 112 and a cover plate 113. The heat dissipation fins 111 are installed on the heat dissipation base plate 112. There are multiple heat dissipation fins 111, and each heat dissipation fin 111 is arranged in parallel. The entire heat dissipation fin 111 is in the shape of a rectangular parallelepiped as a whole. Two first radiator joints 114 and two ventilation pipe openings 115 are provided at the bottom of the heat dissipation base plate 112. The two joints are used to connect the coolant, one inlet and one outlet, and the two ventilation pipe openings 115 are used to connect positive pressure air and negative pressure air. Condensate pipelines and ventilation pipelines are buried in the heat dissipation base plate 112. The two ends of the condensate pipeline are respectively connected to the two first radiator joints 114, and the two ends of the ventilation pipeline are respectively connected to the two ventilation pipe openings 115. The ventilation pipe opening 115 for connecting negative pressure air is located in the center of the bottom of the heat dissipation base plate 112. Installing the first radiator 11 within the fluidized bed 1 tends to increase dust accumulation. Therefore, a positive-pressure ventilation port 115 is provided to provide a self-cleaning function for the radiator. A negative-pressure ventilation port 115 is also added to remove dust from the fluidized bed. The cover plate 113 is provided with through-holes that correspond to the positions of the first radiator connector 114 and the ventilation port 115. The first radiator connector 114 and the ventilation port 115 extend through the through-holes in the cover plate 113, connecting the cover plate 114 to the bottom of the heat dissipation base plate 112. The airflow rate within the fluidized bed is approximately 45% at this point.

[0029] like Figure 3 and Figure 4 As shown, preferably, there are two first radiators 11, corresponding to two fluidized beds 1 respectively. A groove is provided at the bottom of the fluidized bed 1. The heat dissipation fins 111 of the first radiator 11 are completely inserted into the groove at the bottom of the fluidized bed 1, so that the fins of the first radiator 11 are completely inserted into the groove of the fluidized bed 1, and the cover plate 113 is attached to the bottom of the fluidized bed 1. ( Figure 3 For ease of illustration, the heat sink fins 111 are not fully inserted into the grooves. Fluidized bed 1 maximizes the gas-tobacco contact surface, and the gas is relatively clean after dust removal. Therefore, two first heat sinks 11 are added to the bottom of fluidized bed 1. To prevent airflow from abrading the radiator surface and causing pipe leaks, pipes are embedded within the heat sink base to prevent coolant leaks. This improves work efficiency and reduces maintenance time.

[0030] Specifically, such as Figure 5As shown, the second radiator 25 includes a frame 211, a partition plate 213 and heat dissipation fins 214. One side edge of the frame 211 is recessed inward to form a notch 212. The notch 212 can be used to insert a fixing piece to fix the second radiator. The two ends of the partition plate 213 are respectively connected to the opposite sides of one side of the frame 211. The other opposite sides of the frame 211 are spaced apart from the two outer partition plates 213. Each partition plate 213 is distributed in a grid shape. Heat dissipation fins 214 are connected between the partition plates 213 and the other opposite sides of the frame 211 and between each partition plate. Ventilation holes are formed between each heat dissipation fin 214. The aperture of the filter screen 2 is about 0.2 mm, and the aperture of the ventilation hole of the second radiator 21 is about 1.1 mm. The aperture of the second radiator 21 is larger than the aperture of the filter screen, which does not affect the ventilation volume, avoids large particles of foreign matter clogging the radiator, increases work efficiency, and reduces maintenance time. A pair of second radiator connectors 215 are provided on the frame 211. The second radiator connector 215 is used to connect condensate.

[0031] Specifically, such as Figure 6 As shown, the third radiator 31 includes a frame 311, heat dissipation fins 312, a partition plate and an extension portion 313. There are multiple partition plates, and the two ends of the partition plates are respectively connected to the opposite sides of one side of the frame 311. The other opposite sides of the frame 311 are separated from the two outer partition plates. Each partition plate is distributed in a grid shape. Heat dissipation fins 312 are connected between the partition plates and the other opposite sides of the frame 311 and between each partition plate. One side of the frame 311 extends outward to form an extension portion 313. The extension portion 313 is provided with two third radiator interfaces 314, one for inlet and one for outlet. The third radiator interface 314 is used to connect the condensate.

[0032] Specifically, such as Figure 7 As shown, the fourth radiator and the fifth radiator include a rod body 411 and heat dissipation fins 412 . The rod body 411 is cylindrical, and the heat dissipation fins 412 are annular sheet structures. Each heat dissipation fin is sleeved on the rod body 411 .

[0033] Specifically, such as Figure 8As shown, the vortex tube 10 includes a vortex tube body 101, a screw 102 and an air inlet pipe 103. The two ends of the vortex tube body 101 respectively form a first opening 104 and a second opening 105. The first opening 104 is the air outlet of the vortex tube, and the air outlet is connected to the inlet of the circulating fan 8. A vortex cavity is formed in the vortex tube body 101, and the screw 102 is placed in the vortex cavity. The air inlet pipe 103 is vertically connected to the vortex tube body 101, and the air inlet pipe 103 is connected to the first opening 104. The motor is connected to the screw 105 through the second opening 105. The vortex tube 10 uses compressed air as a power source. The rotation of the screw 102 generates a spiral rotation in the vortex cavity, resulting in the separation of the outer hot air flow and the central cold air flow. The cold air flow is then introduced into the inlet of the circulating fan 8 to supplement a small amount of low-temperature compressed air. While further reducing the air temperature in the air duct, the turbocharging technology is used to increase the pressure of the circulation system to meet the process pressure requirements.

[0034] The working principle of the present invention is: built-in heat exchangers are added to the upper part of the fluidized bed filter, the fluidized bed, the inside of the primary air separation device, the inside of the secondary air separation device, and the compensation air duct inside the entire circulating air system, so as to realize heat exchange and greatly improve the cooling capacity of the system. At the same time, by setting up a vortex tube 10, the vortex tube 10 uses compressed air as the power source, and generates spiral rotation in the vortex cavity through the rotation of the screw 102, resulting in the separation of the outer hot air flow and the central cold air flow, and then the cold air flow is introduced into the inlet of the circulating fan 8 to supplement a small amount of low-temperature compressed air. While further reducing the air temperature in the air duct, the turbocharging technology is used to increase the pressure of the circulation system to ensure the process pressure requirements.

[0035] Example

[0036] Assuming the maximum flow rate of the fluidized bed outlet is 1720m3 / h, the maximum flow rate of the fan outlet is 1447m3 / h, and the fan effective operating rate is 90%, the air density is about 1.29Kg / m 3 The specific heat capacity of air is about 1.003KJ / (kg*K). The amount of heat required to raise the temperature of one cubic meter of air by one degree is: Q=1.003J / (kg*K)*1.29Kg / m 3 *1m 3*1K=1.29387KJ, assuming that the maximum temperature of the fluidized bed is 55°C (higher than the actual value), the fluidized bed temperature is controlled to 35°C (lower than the required value), the temperature difference is 20°C, the heat in the air distribution box (based on the maximum air volume and 20K) is approximately 37445KJ, and the heat exchange power in the air distribution box is approximately 10.5KW / h. Based on the fact that approximately 100% natural air enters the fluidized bed, the flow rate is approximately 1187m3 / h. Assuming that the natural air temperature is 30°C (higher than the actual value), the fluidized bed temperature is controlled to 35°C (lower than the required value), the temperature difference is 5°C, the heat reduction in the fluidized bed (based on the maximum air volume and 5K) is approximately 7680KJ, and the heat exchange power in the fluidized bed is approximately: (37445KJ-7680KJ) / 3600≈8.3KW / h.

[0037] From the above description, it can be seen that the present invention adds built-in heat exchangers on the upper part of the fluidized bed filter, on the fluidized bed, inside the primary air separation device, inside the secondary air separation device, and in the compensation air duct inside the entire circulating air system, rather than the local separate heat exchange in the prior art, which greatly improves the system cooling capacity; in addition, the present invention adopts a vortex tube and uses compressed air as the power source to generate spiral rotation in the vortex cavity, resulting in the separation of the outer hot air flow and the central cold air flow, and then introduces the cold air flow into the circulating fan inlet to supplement a small amount of low-temperature compressed air. While further reducing the air temperature in the air duct, the turbocharging technology is used to increase the circulation system pressure to ensure the process pressure requirements.

[0038] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A fluidized bed circulating air cooling system, comprising a fluidized bed (1), a compensating air duct (3), a primary sorting device (4), a secondary sorting device (5), a main fan (6), an air distribution box (7) and a circulating fan (8), wherein the fluidized bed (1) is connected to one end of the circulating fan (8) through a pipeline, and the air distribution box (7) is connected to the fluidized bed (1), the primary sorting device (4), the secondary sorting device (5) and the compensating air duct (3) are all connected between the fluidized bed (1) and the air distribution box (7), the fluidized bed (1) is connected to one end of the main fan (6) through an air chamber, and the other end of the main fan (6) is connected to the air distribution box (7) and the fluidized bed (1); a filter screen (2) is installed on the fluidized bed (1), characterized in that: A first radiator (11) is installed on the fluidized bed (1), and a second radiator (21) is installed above the filter screen (2); the first radiator (11) comprises a first radiator fin (111), a radiator base plate (112) and a cover plate (113); the first radiator fin (111) is provided with a plurality of fins; the first radiator fin (111) is installed on the radiator base plate (112); the bottom of the radiator base plate (112) is provided with two first radiator joints (114) for connecting condensate and two ventilation pipe openings (115); a condensate pipeline and a ventilation pipeline are buried in the radiator base plate (112); the two ends of the condensate pipeline are respectively connected to the two joints (114); the two ends of the ventilation pipeline are respectively connected to the two ventilation pipe openings (115); the cover plate (113) is provided with through holes; each first radiator joint (114) and ventilation pipe opening (115) is connected to the first radiator joint (114) and ventilation pipe opening (115); The opening (115) corresponds to the position of the through hole, the first radiator joint (114) and the ventilation pipe opening (115) pass through the through hole of the cover plate (113), so that the cover plate (113) is connected to the bottom of the heat dissipation base plate (112); a vortex tube (10) is installed at the inlet of the circulation fan (8), the vortex tube (10) comprises a vortex tube body (101), a screw (102) and an air inlet pipe (103), the two ends of the vortex tube body (101) respectively form a first opening (104) and a second opening (105), the first opening (104) is connected to the inlet of the circulation fan (8), a vortex cavity is formed in the vortex tube body (101), the screw (102) is placed in the vortex cavity, the air inlet pipe (103) is vertically connected to the vortex tube body (101), and the air inlet pipe (103) is connected to the first opening (104).

2. The fluidized bed circulating air cooling system according to claim 1, characterized in that: The bottom of the fluidized bed (1) is provided with a groove, and the whole formed by the heat dissipation fins (111) of the first heat sink (11) is completely inserted into the groove at the bottom of the fluidized bed (1), and the cover plate (113) is located at the bottom of the fluidized bed (1).

3. The fluidized bed circulating air cooling system according to claim 1, characterized in that: The second radiator (21) comprises a frame (211), a partition plate (213) and two heat dissipation fins (214). One side edge of the frame (211) is recessed inward to form a notch (212). The two ends of the partition plate (213) are respectively connected to the opposite side of the frame (211). The other opposite side of the frame (211) is spaced apart from the two outer partition plates (213). Each partition plate (213) is distributed in a grid shape. The heat dissipation fins (214) are connected between the space between the partition plate (213) and the other opposite side of the frame (211) and between each partition plate (213). The frame (211) is provided with a second radiator connector (215) for connecting condensate.

4. The fluidized bed circulating air cooling system according to claim 3, characterized in that: Ventilation holes are formed between each of the second heat dissipation fins (214), and the aperture of the second heat sink (21) is larger than the aperture of the filter (2).

5. The fluidized bed circulating air cooling system according to claim 1, characterized in that: A third radiator is installed at the compensation air duct (3).

6. The fluidized bed circulating air cooling system according to claim 1, characterized in that: The primary sorting device (4) is equipped with a fourth radiator, and the secondary sorting device (5) is internally equipped with a fifth radiator.

7. The fluidized bed circulating air cooling system according to claim 5, characterized in that: The third radiator (31) comprises a second frame (311), three heat dissipating fins (312) and a second partition plate. A plurality of second partition plates are provided. The two ends of the second partition plates are respectively connected to one side opposite edge of the second frame (311). The other side opposite edge of the second frame (311) is spaced apart from the two outer second partition plates. Each second partition plate is distributed in a grid shape. The heat dissipating fins (312) are connected between the space between the second partition plate and the other side opposite edge of the second frame (311) and between each second partition plate. One side edge of the second frame (311) extends outward to form an extension portion (313). The extension portion (313) is provided with a third radiator interface (314) for connecting to condensate.

8. The fluidized bed circulating air cooling system according to claim 6, characterized in that: The fourth radiator and the fifth radiator comprise a rod body (411) and four heat dissipation fins (412), wherein the rod body (411) is cylindrical, and the four heat dissipation fins (412) are annular sheet structures, and each four heat dissipation fin (412) is sleeved on the rod body (411).

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