A bypass flue gas waste heat cascade utilization device

Abstract

The present invention provides a bypass flue gas waste heat cascade utilization device, belonging to the field of waste heat utilization technology. A bypass flue gas waste heat cascade utilization device includes a shell, a partition plate, a first chamber, a second chamber, a water inlet pipe, a water outlet pipe, a smoke inlet pipe, a filter bucket, a discharge pipe and a smoke conveying pipe; the smoke conveying pipe composed of a U-shaped intermediate pipe, an upper spiral pipe, a smoke guide pipe and a lower spiral pipe is distributed between the first chamber and the second chamber, which can not only increase the flow path of the smoke in the first chamber and the second chamber, prolong the contact time between the smoke and the circulating medium, and improve the heat exchange efficiency, but also ensure that the smoke flows evenly and stably, reducing energy loss. At the same time, the discharge pipe is arranged vertically, which not only facilitates the natural falling of impurities from top to bottom to avoid blockage, but also its pipe wall can exchange heat with the circulating medium, further realizing the recovery and utilization of waste heat in the impurities.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat utilization, and in particular to a bypass flue gas waste heat cascade utilization device. Background Art

[0002] With the rapid development of industrialization and the increasing demand for energy, energy efficiency and environmental protection have become key issues that the industry must face. Boilers, as important heat supply equipment in the industrial field, will inevitably produce a large amount of high-temperature flue gas during the combustion process, which contains rich waste heat resources. However, if these high-temperature flue gases are not properly handled and efficiently utilized, it will not only lead to a huge waste of energy, but may also aggravate environmental pollution and pose a serious threat to the human living environment. Therefore, in order to effectively utilize the waste heat resources in these high-temperature flue gases, improve energy efficiency, and reduce environmental pollution, waste heat utilization devices are needed.

[0003] Traditional waste heat recovery devices generally use straight pipes or simple curved pipe structures in design. This design method has obvious defects. First, due to the relatively short flow path, the flue gas flows quickly in the device, resulting in a serious lack of contact time between the flue gas and the heat exchange medium. This means that a large amount of heat is discharged without sufficient exchange, which seriously affects the efficiency of waste heat recovery. Secondly, this design has limited impurity processing capabilities in the flue gas. Flue gas often contains impurities such as particulate matter and dust. These impurities are easy to accumulate on the inner wall or elbow of the pipe when flowing in a straight pipe or a simple curved pipe. Long-term accumulation will not only cause pipeline blockage and affect the normal flow of flue gas, but may also cause corrosion and wear to the heat exchange medium and pipeline materials, thereby increasing the maintenance cost of the device and shortening its service life. To this end, in response to this problem, the present invention proposes a bypass flue gas waste heat cascade utilization device. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a bypass flue gas waste heat cascade utilization device that can overcome the above problems or at least partially solve the above problems.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a bypass flue gas waste heat cascade utilization device, comprising an outer shell, a dividing plate, fixed on the inner wall of the outer shell, and forming a first chamber and a second chamber with the interior of the outer shell, the outer shell is respectively connected with water inlet pipes located in the first chamber and the second chamber near the bottom corresponding to each other, the outer shell is respectively connected with water outlet pipes located in the first chamber and the second chamber near the top corresponding to each other, a smoke inlet pipe, connected to the top center of the outer shell, the inner wall of the smoke inlet pipe is connected with a filter bucket, a smoke inlet chamber is formed between the filter bucket and the inner bottom wall of the smoke inlet pipe, the bottom of the filter bucket is connected with a discharge pipe arranged between the top and bottom of the outer shell and with a control valve, a spiral smoke conveying pipe fitting is provided between the first chamber and the second chamber, one end of the smoke conveying pipe fitting is connected with the interior of the smoke inlet chamber, and the other end of the smoke conveying pipe fitting extends to below the bottom of the outer shell.

[0006] Preferably, the diameter of the filter funnel gradually decreases from the top end to the bottom end, and smoke inlet holes are evenly distributed between the inner surface and the outer surface of the filter funnel.

[0007] Preferably, the smoke conveying pipe comprises a U-shaped middle tube fixed between the top and bottom of the dividing plate, one end of the U-shaped middle tube is connected to an upper spiral tube located in the first chamber, the other end of the upper spiral tube is connected to a smoke guide tube connected to the interior of the smoke inlet chamber, the other end of the U-shaped middle tube is connected to a lower spiral tube located in the second chamber, and the smoke outlet end of the lower spiral tube extends to below the bottom of the outer shell.

[0008] Preferably, the discharge pipe is located between the top and the bottom of the shell and is arranged to be rotatably connected.

[0009] Preferably, when the discharge pipe is rotatably connected between the top and the bottom of the shell, the outer contour surface of the filter bucket near the top fits with the inner wall of the smoke inlet pipe, and the discharge pipe is provided with a driving mechanism located below the bottom of the shell.

[0010] Preferably, the driving mechanism includes an L-shaped mounting frame fixed on the bottom of the outer shell, a driving unit is installed at the bottom of the L-shaped mounting frame, the output end of the driving unit is connected to a circular gear 1, and the surface of the circular gear 1 is connected to a circular gear 2 that is adapted and fixed on the discharge pipe.

[0011] Preferably, when the discharge pipe rotates in the housing, a pair of stirring parts are mounted on the discharge pipe and are mirror-symmetrical between the dividing plates.

[0012] Preferably, when the discharge pipe drives the filter bucket to rotate in a circle along the inner wall of the smoke inlet pipe, the inner wall of the smoke inlet pipe is provided with a cleaning piece that fits with the inner surface of the filter bucket.

[0013] Preferably, the cleaning component includes a positioning rod transversely fixed on the inner wall of the smoke inlet pipe, the positioning rod is fixed with a vertical rod vertically corresponding to the discharge pipe, the vertical rod is fixed with an L-shaped connecting rod located in the filter bucket, and the L-shaped connecting rod is connected to a cleaning brush that fits the inner surface of the filter bucket.

[0014] Preferably, the positioning rod and the vertical rod are in a "T" shape, a scraper fitted with the inner wall of the discharge pipe is fixed on the vertical rod, and the scraper connected to the positioning rod and the cleaning brush connected to the positioning rod are arranged in opposite directions.

[0015] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention distributes the smoke conveying pipe parts composed of the U-shaped middle tube, the upper spiral tube, the smoke guide tube and the lower spiral tube between the first chamber and the second chamber, which not only enables the high-temperature part and the low-temperature part in the smoke to be used to heat the circulating medium in different chambers respectively, but also increases the flow path of the smoke in the first chamber and the second chamber, prolongs the contact time between the smoke and the circulating medium, improves the heat exchange efficiency, ensures that the smoke flows evenly and stably, and reduces energy loss. At the same time, the design of the filter bucket and the discharge pipe not only facilitates the natural falling and discharge of impurities from top to bottom to avoid blockage, but also the waste heat carried by the impurities entering the discharge pipe can be heat exchanged with the circulating medium, further improving the utilization efficiency of the waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the connection structure between a partition plate and a shell of a bypass flue gas waste heat cascade utilization device provided by the present invention;

[0017] Figure 2 A schematic diagram of the cross-sectional structure of a smoke inlet pipe of a bypass smoke gas waste heat cascade utilization device provided by the present invention;

[0018] Figure 3 A schematic diagram of the structure of a smoke conveying pipe member of a bypass smoke gas waste heat cascade utilization device provided by the present invention;

[0019] Figure 4 A front cross-sectional view of a bypass flue gas waste heat cascade utilization device provided by the present invention;

[0020] Figure 5 A schematic diagram of the driving mechanism structure of a bypass flue gas waste heat cascade utilization device provided by the present invention;

[0021] Figure 6A schematic diagram of the cross-sectional structure of the shell of a bypass flue gas waste heat cascade utilization device provided by the present invention;

[0022] Figure 7 A bypass flue gas waste heat cascade utilization device provided by the present invention Figure 6 A schematic diagram of the partially enlarged structure at center A;

[0023] Figure 8 A schematic diagram of the connection structure between the upper spiral tube and the first chamber of a bypass flue gas waste heat cascade utilization device provided by the present invention;

[0024] Fig. 9 A bypass flue gas waste heat cascade utilization device provided by the present invention Figure 8 A schematic diagram of the partially enlarged structure at B in the middle;

[0025] Fig.10 A schematic diagram of the overall wire frame structure of a bypass flue gas waste heat cascade utilization device provided by the present invention.

[0026] In the figure: 1. outer shell; 11. first chamber; 12. second chamber; 13. water inlet pipe; 14. water outlet pipe; 2. dividing plate; 3. smoke inlet pipe; 31. filter bucket; 32. smoke inlet chamber; 33. discharge pipe; 34. smoke inlet hole; 35. stirring part; 4. smoke conveying pipe; 41. U-shaped intermediate pipe; 42. upper spiral pipe; 43. smoke guide pipe; 44. lower spiral pipe; 5. driving mechanism; 51. L-shaped mounting frame; 52. driving part; 53. circular gear one; 54. circular gear two; 6. cleaning part; 61. positioning rod; 62. vertical rod; 63. L-shaped connecting rod; 64. cleaning brush; 65. scraper; 7. supporting connecting frame. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0029] In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They 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, and therefore should not be understood as a limitation on the present invention.

[0030] Reference Figure 1-Figure 10A bypass flue gas waste heat cascade utilization device includes a shell 1, a partition plate 2, which is fixed on the inner wall of the shell 1 and forms a first chamber 11 and a second chamber 12 with the inside of the shell 1, and the shell 1 is respectively connected with a water inlet pipe 13 located in the first chamber 11 and the second chamber 12 near the bottom, and the shell 1 is respectively connected with a water outlet pipe 14 located in the first chamber 11 and the second chamber 12 near the top, and a smoke inlet pipe 3 is connected to the top center of the shell 1. The inner wall of the smoke inlet pipe 3 is connected with a filter 31, and the top end diameter of the filter 31 is The diameter of the upper end of the filter 31 gradually decreases, and smoke inlet holes 34 are evenly distributed between the inner surface and the outer surface of the filter 31. A smoke inlet chamber 32 is formed between the filter 31 and the inner bottom wall of the smoke inlet pipe 3. The bottom of the filter 31 is connected to a discharge pipe 33 arranged between the top and the bottom of the shell 1 and with a control valve. The control valve installed on the discharge pipe 33 is located below the bottom of the shell 1. A spiral smoke conveying pipe 4 is provided between the first chamber 11 and the second chamber 12. One end of the smoke conveying pipe 4 is connected to the inside of the smoke inlet chamber 32, and the other end of the smoke conveying pipe 4 extends to below the bottom of the shell 1.

[0031] Such a technical solution is adopted in consideration of the fact that impurities in the smoke are usually directly filtered and discharged, resulting in the waste heat on the impurities in the smoke not being fully utilized, resulting in poor efficiency in utilizing the waste heat of the smoke. Based on this problem, the present invention designs a filter 31 and a discharge pipe 33 designed at the bottom of the filter 31 in the smoke inlet pipe 3. When the high-temperature smoke enters from the smoke inlet pipe 3, the smoke impurities are effectively filtered through the filter 31, so that the filtered smoke enters the smoke inlet cavity 32 and flows into the spiral smoke conveying pipe 4. The spiral smoke conveying pipe 4 can effectively increase the amount of smoke in the first cavity. The flow path in the first chamber 11 and the second chamber 12 prolongs the contact time between the flue gas and the circulating medium, thereby improving the efficiency of heat exchange and the effect of waste heat recovery. Compared with the design in which the flue gas directly passes through a straight pipe or a simple curved pipe in the traditional device, this design is not only more efficient and can better utilize the waste heat resources of the flue gas. At the same time, the spiral smoke conveying pipe 4 also helps to reduce the flow rate of the flue gas, reduce the flow resistance, and make the smoke more evenly distributed inside the device. This not only avoids local overheating or overcooling, but also ensures that the heat exchange process inside the entire device is more stable and reliable.

[0032] The impurities in the flue gas will flow into the discharge pipe 33 along the inner surface of the filter hopper 31, so that the impurities entering the discharge pipe 33 can fall from top to bottom. The advantage of this design is that the waste heat carried by the impurities during the falling process can be effectively transferred to the circulating medium introduced into the first chamber 11 and the second chamber 12 through the tube wall of the discharge pipe 33. This design makes full use of the waste heat in the impurities, further improves the utilization efficiency of the waste heat, and reduces energy waste. Secondly, the vertically designed discharge pipe 33 can also make the impurities be discharged smoothly and quickly after the waste heat is utilized. Compared with some traditional horizontal or inclined discharge pipes 33, the vertical discharge pipe 33 can better ensure that the impurities fall smoothly and avoid blockage or accumulation problems, thereby simplifying the discharge process of impurities and improving the operating efficiency of the device.

[0033] In a preferred embodiment, referring to Figure 1-Figure 4 The smoke conveying pipe 4 includes a U-shaped middle pipe 41 fixed between the top and the bottom of the dividing plate 2, one end of the U-shaped middle pipe 41 is connected to an upper spiral pipe 42 located in the first chamber 11, the other end of the upper spiral pipe 42 is connected to a smoke guide pipe 43 connected to the inside of the smoke inlet chamber 32, and the other end of the U-shaped middle pipe 41 is connected to a lower spiral pipe 44 located in the second chamber 12, and the smoke outlet end of the lower spiral pipe 44 extends to below the bottom of the shell 1.

[0034] The present invention, through the design of the U-shaped middle tube 41, not only fixes the positions of the upper spiral tube 42 and the lower spiral tube 44, but also ensures that the flue gas can flow smoothly between the upper spiral tube 42 and the lower spiral tube 44. When the high-temperature flue gas enters the upper spiral tube 42 through the smoke guide tube 43, the heat it carries is quickly transferred to the heat exchange medium such as water in the first chamber 11. In this way, the high-temperature part of the flue gas is first used to heat the circulating medium in the first chamber 11, thereby realizing the preliminary recovery of waste heat. As the flue gas flows and the heat is transferred in the upper spiral tube 42, its temperature gradually decreases. At this time, the flue gas that has been initially cooled enters the U-shaped middle tube 41. The flue gas flows through the intermediate tube 41 and continues to flow to the lower spiral tube 44, where the flue gas with further reduced temperature exchanges heat with the heat exchange medium in the second chamber 12, thereby realizing deep recovery of waste heat. Finally, the flue gas that has undergone two heat exchanges is discharged from the smoke outlet end of the lower spiral tube 44, at which time its temperature has been greatly reduced, thereby effectively avoiding energy waste and environmental pollution. The design of the present invention enables the high-temperature part and the low-temperature part of the flue gas to be used for heating the circulating medium in different chambers respectively, thereby realizing the step-by-step utilization of waste heat. This step-by-step utilization method not only improves the energy utilization efficiency, but also makes the heat exchange process of the entire device more uniform and efficient.

[0035] In a preferred embodiment, referring to Figure 4 and Figure 5The discharge pipe 33 is located between the top and the bottom of the shell 1 and is arranged to be rotatably connected. When the discharge pipe 33 is rotatably connected between the top and the bottom of the shell 1, the outer contour surface of the filter 31 near the top fits with the inner wall of the smoke inlet pipe 3. The discharge pipe 33 is provided with a driving mechanism 5 located below the bottom of the shell 1. The driving mechanism 5 includes an L-shaped mounting frame 51 fixed to the bottom of the shell 1. A driving part 52 is installed at the bottom of the L-shaped mounting frame 51. A circular gear 1 53 is connected to the output end of the driving part 52. A circular gear 2 54 that is matched and fixed on the discharge pipe 33 is connected to the surface of the circular gear 1 53. A plurality of circumferentially distributed and L-shaped supporting connecting frames 7 are fixed on the shell 1 for coordinating the installation of the entire device and external components to improve the stability of the device during use.

[0036] The present invention starts the driving part 52 using the servo motor to drive the circular gear 1 53 and the circular gear 2 54 to transmit to each other, so as to drive the filter bucket 31 connected to the top of the discharge pipe 33 to make a circular motion along the inner wall of the smoke inlet pipe 3, so that impurities can be more smoothly introduced into the discharge pipe 33 along its inner surface. This dynamic filtration method is more efficient than static filtration, because impurities will not stay at a certain position of the filter bucket 31 for a long time, but will be continuously brought to the discharge pipe 33 with the movement of the filter bucket 31. Due to the continuous rotation of the filter bucket 31, impurities are not easy to accumulate in the filter bucket 31, which avoids the problem of reduced filtration efficiency or clogging of the filter bucket 31 due to the accumulation of impurities. Through the rotation filtration of the filter bucket 31, clean smoke can enter the smoke inlet chamber 32 more quickly and be introduced into the smoke conveying pipe 4, which reduces the situation of poor smoke flow caused by impurities and improves the processing capacity of the entire device. In addition, the continuous rotation of the filter bucket 31 also ensures the continuity of the filtration process, and can maintain a stable filtration effect even under conditions of large flow or high concentration of smoke.

[0037] In a preferred embodiment, referring to Figure 4 When the discharge pipe 33 rotates in the housing 1 , a pair of stirring parts 35 are installed on the discharge pipe 33 in a mirror-symmetrical manner between the dividing plates 2 , and the stirring part 35 includes a plurality of stirring blades distributed circumferentially on the discharge pipe 33 .

[0038] In the present invention, when the discharge pipe 33 is rotating, a pair of stirring parts 35 designed on the discharge pipe 33 can also stir the circulating medium entering the first chamber 11 and the second chamber 12 respectively. This design cleverly utilizes the power of the rotation of the discharge pipe 33, and does not require additional driving equipment, thereby achieving effective stirring of the circulating medium, and further promoting the corresponding circulating medium located in the first chamber 11 and the second chamber 12 to fully contact with the upper spiral tube 42, the lower spiral tube 44 and the corresponding wall surfaces of the discharge pipe 33, thereby accelerating the transfer of heat, which not only improves the heat exchange efficiency, but also helps to prevent the circulating medium from forming local dead zones or temperature stratification in the first chamber 11 and the second chamber 12, further improving the thermal performance of the entire device.

[0039] In a preferred embodiment, referring to Figure 7 and Fig. 9 When the discharge pipe 33 drives the filter bucket 31 to rotate in a circle along the inner wall of the smoke inlet pipe 3, the inner wall of the smoke inlet pipe 3 is provided with a cleaning piece 6 that fits the inner surface of the filter bucket 31. The cleaning piece 6 includes a positioning rod 61 transversely fixed on the inner wall of the smoke inlet pipe 3, and a vertical rod 62 vertically corresponding to the discharge pipe 33 is fixed on the positioning rod 61. An L-shaped connecting rod 63 located in the filter bucket 31 is fixed on the vertical rod 62, and a cleaning brush 64 that fits the inner surface of the filter bucket 31 is connected to the L-shaped connecting rod 63.

[0040] In the present invention, the cleaning brush 64 designed on the L-shaped connecting rod 63 can continuously brush the area around the smoke inlet 34 during the rotation of the filter bucket 31, and effectively scrape off the attached impurities. This not only prevents the impurities from clogging the smoke inlet 34 and affecting the circulation of smoke, but also maintains the filtering effect of the filter bucket 31 and extends its service life.

[0041] In a preferred embodiment, referring to Figure 7 The positioning rod 61 and the vertical rod 62 form a "T" shape, and the bottom end of the vertical rod 62 is close to the bottom end of the discharge pipe 33. A scraper 65 that fits the inner wall of the discharge pipe 33 is fixed on the vertical rod 62. The scraper 65 connected to the positioning rod 61 and the cleaning brush 64 connected to the positioning rod 61 are arranged in opposite directions.

[0042] According to the present invention, the vertical rod 62 can be stably and vertically supported by the positioning rod 61 in the discharge pipe 33, and the scraper 65 designed on the vertical rod 62 is in contact with the inner wall of the discharge pipe 33. When the discharge pipe 33 is rotating, the scraper 65 can scrape off the impurities attached to the inner wall of the discharge pipe 33, which can not only avoid excessive impurities on the inner wall of the discharge pipe 33 and reduce the efficiency of heat transfer of the discharge pipe 33 to the impurities, but also reduce the corrosion and wear of the inner wall of the discharge pipe 33 by the impurities.

[0043] In addition, it should be noted that the scraper 65 and the cleaning brush 64 respectively designed on the positioning rod 61 are not on the same side, but are designed in opposite directions. The advantage of this design is that it ensures that the two can work independently when the discharge pipe 33 rotates without interfering with each other. The cleaning brush 64 is responsible for cleaning impurities attached to the smoke inlet 34 on the inner surface of the filter bucket 31, while the scraper 65 is responsible for removing impurities on the inner wall of the discharge pipe 33. This division of labor and cooperation makes the entire cleaning process more efficient and thorough.

[0044] In summary, the rotatable discharge pipe 33 forms an efficient cooperation mechanism with the smoke conveying pipe 4 through its multiple functions such as dynamic filtration, enhanced heat exchange and coordinated cleaning. This cooperation not only makes full use of the waste heat, but also significantly improves the processing efficiency, heat exchange effect and cleanliness of the device, which provides reliable technical support for heat energy supply and environmental protection in the industrial field.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bypass flue gas waste heat cascade utilization device, characterized in that: include: Housing (1); The dividing plate (2) is fixed on the inner wall of the outer shell (1), and forms a first chamber (11) and a second chamber (12) with the inner part of the outer shell (1); the outer shell (1) is respectively connected with corresponding water inlet pipes (13) located in the first chamber (11) and in the second chamber (12) near the bottom; the outer shell (1) is respectively connected with corresponding water outlet pipes (14) located in the first chamber (11) and in the second chamber (12) near the top; A smoke inlet pipe (3) is connected to the top center of the shell (1); a filter funnel (31) is connected to the inner wall of the smoke inlet pipe (3); a smoke inlet cavity (32) is formed between the filter funnel (31) and the inner bottom wall of the smoke inlet pipe (3); the bottom of the filter funnel (31) is connected to a discharge pipe (33) provided between the top and the bottom of the shell (1) and having a control valve; a spiral smoke conveying pipe member (4) is provided between the first chamber (11) and the second chamber (12); one end of the smoke conveying pipe member (4) is connected to the interior of the smoke inlet cavity (32); the other end of the smoke conveying pipe member (4) extends to below the bottom of the shell (1); The discharge pipe (33) is located between the top and the bottom of the outer shell (1) and is arranged to be rotatably connected. When the discharge pipe (33) is rotatably connected between the top and the bottom of the outer shell (1), the outer contour surface of the filter bucket (31) close to the top fits with the inner wall of the smoke inlet pipe (3). The discharge pipe (33) is provided with a driving mechanism (5) located below the bottom of the outer shell (1).

2. The bypass flue gas waste heat cascade utilization device according to claim 1, characterized in that: The diameter of the filter bucket (31) gradually decreases from the top end to the bottom end, and smoke inlet holes (34) are evenly distributed between the inner surface and the outer surface of the filter bucket (31).

3. The bypass flue gas waste heat cascade utilization device according to claim 1, characterized in that: The smoke conveying pipe (4) comprises a U-shaped intermediate tube (41) fixed between the top and bottom of the dividing plate (2); one end of the U-shaped intermediate tube (41) is connected to an upper spiral tube (42) located in the first chamber (11); the other end of the upper spiral tube (42) is connected to a smoke guide tube (43) communicating with the interior of the smoke inlet chamber (32); the other end of the U-shaped intermediate tube (41) is connected to a lower spiral tube (44) located in the second chamber (12); and the smoke outlet end of the lower spiral tube (44) extends to below the bottom of the outer shell (1).

4. The bypass flue gas waste heat cascade utilization device according to claim 1, characterized in that: The driving mechanism (5) comprises an L-shaped mounting frame (51) fixed on the bottom of the housing (1); a driving unit (52) is mounted on the bottom of the L-shaped mounting frame (51); an output end of the driving unit (52) is connected to a circular gear 1 (53); and a surface of the circular gear 1 (53) is connected to a circular gear 2 (54) matched and fixed to the discharge pipe (33).

5. The bypass flue gas waste heat cascade utilization device according to claim 1, characterized in that: When the discharge pipe (33) rotates in the housing (1), a pair of stirring parts (35) are mounted on the discharge pipe (33) and are mirror-symmetrically disposed between the dividing plates (2).

6. The bypass flue gas waste heat cascade utilization device according to claim 1, characterized in that: When the discharge pipe (33) drives the filter bucket (31) to rotate in a circle along the inner wall of the smoke inlet pipe (3), the inner wall of the smoke inlet pipe (3) is provided with a cleaning piece (6) that fits the inner surface of the filter bucket (31).

7. The bypass flue gas waste heat cascade utilization device according to claim 6, characterized in that: The cleaning member (6) comprises a positioning rod (61) transversely fixed on the inner wall of the smoke inlet pipe (3), a vertical rod (62) vertically corresponding to the inside of the discharge pipe (33) is fixed on the positioning rod (61), an L-shaped connecting rod (63) located in the filter bucket (31) is fixed on the vertical rod (62), and a cleaning brush (64) that fits the inner surface of the filter bucket (31) is connected to the L-shaped connecting rod (63).

8. The bypass flue gas waste heat cascade utilization device according to claim 7, characterized in that: The positioning rod (61) and the vertical rod (62) are in a "T" shape, and a scraper (65) that fits the inner wall of the discharge pipe (33) is fixed on the vertical rod (62). The scraper (65) connected to the positioning rod (61) and the cleaning brush (64) connected to the positioning rod (61) are arranged in opposite directions.

Images