Boiler waste heat utilization device

Abstract

The present invention provides a boiler waste heat utilization device, including a shell, wherein a plurality of staggered heat exchange tubes are arranged inside the shell, and the ends of the heat exchange tubes are respectively connected to two water collecting tanks, the water collecting tanks are fixed on the outer wall of the shell, and the two water collecting tanks are connected to the corresponding water circulation heating system; the bottom and top of the shell are respectively connected to an air inlet pipe and an air outlet pipe, and the air inlet pipe is connected to the flue gas outlet of the boiler; a mixed flow component, wherein the mixed flow component is arranged at the inner cavity of the air inlet pipe, and the mixed flow component includes a floating part and a guide part connected to the floating part in a transmission manner, wherein the floating part slides in the vertical direction and drives the guide part to expand and contract, and the floating part is driven to float by the boiler flue gas. The present invention drives the floating part and the mixing part to be dynamically adjusted by the rising force of the high-temperature flue gas, thereby realizing the optimization of the flue gas flow path, the regulation of the flow rate, and the maximization of the thermal energy utilization rate.

Description

Technical Field

[0001] The invention relates to the field of waste heat utilization, and in particular to a boiler waste heat utilization device. Background Art

[0002] Boiler flue gas waste heat recovery refers to a technical measure that uses reasonable technical means to recover and utilize the heat contained in the high-temperature flue gas emitted during the operation of the boiler to improve energy utilization efficiency, reduce operating costs and reduce environmental pollution.

[0003] In traditional boilers or waste heat recovery equipment, high-temperature flue gas usually flows through fixed channels, and the path and flow rate design cannot be dynamically adjusted according to actual working conditions. In general waste heat utilization equipment, the temperature in the middle of the inner cavity is high, the temperature on both sides is lower, and the high-temperature flue gas flows faster.

[0004] Therefore, this design may cause the flue gas to stay in a local area for a shorter time, resulting in limited heat exchange effect. At the same time, there is the problem of uneven efficiency. When the high-temperature flue gas enters the heat exchange chamber, it cannot form sufficient contact with the heat exchange element due to the excessively fast flow rate, resulting in a high exhaust temperature and low heat exchange efficiency. In order to extend the residence time of the flue gas, some equipment increases the flow resistance, which causes the system back pressure to increase, affecting the equipment operation efficiency.

[0005] Therefore, a boiler waste heat utilization device is provided to address the above problems. Summary of the invention

[0006] The present invention provides a boiler waste heat utilization device in order to solve the problem of low efficiency of traditional waste heat utilization devices.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] The present invention provides a boiler waste heat utilization device, comprising a shell, wherein a plurality of staggered heat exchange tubes are arranged inside the shell, and the ends of the heat exchange tubes are respectively connected to two water collecting tanks, the water collecting tanks are fixed on the outer wall of the shell, and the two water collecting tanks are connected to corresponding water circulation heating systems;

[0009] The bottom and top of the shell are respectively connected with an air inlet pipe and an air outlet pipe, and the air inlet pipe is connected to the flue gas outlet of the boiler;

[0010] A mixed flow component, which is arranged at the inner cavity of the air inlet pipe, and comprises a floating part and a flow guide part which is transmission-connected with the floating part, wherein the floating part slides in the vertical direction and drives the flow guide part to expand and contract, and the floating part is driven to float by the boiler flue gas;

[0011] The heat exchange tube is provided with a heat conducting part.

[0012] The floating part in the mixed flow component moves upward under the push of the high-temperature boiler flue gas, thereby driving the guide part to expand. The expanded guide part can guide the high-temperature flue gas that has just entered the shell to both sides of the inner cavity of the shell, increasing the stroke of the high-temperature flue gas inside the shell, so that the high-temperature flue gas can fully contact the heat exchange tube and the heat conduction part on the heat exchange tube, thereby improving the heat exchange effect and preventing the high-temperature flue gas from flowing out of the inner cavity of the shell too quickly.

[0013] In the technical solution, the mixed flow assembly includes a bearing column, the bottom end of which is fixed at the center of the inner cavity of the air intake pipe through a support rod, and the bearing column is arranged vertically;

[0014] A sliding tube is slidably connected to the surface of the bearing column, and an upper connecting plate and a lower connecting plate are respectively fixed to the top and bottom of the sliding tube, wherein the upper connecting plate is connected to the guide part, and the lower connecting plate is connected to the floating part.

[0015] The sliding pipe slides on the surface of the vertically arranged bearing column, thereby realizing power transmission between the floating part and the guide part.

[0016] In the technical solution, the floating part includes a fixed plate of an annular structure, the fixed plate is arranged on the periphery of the bearing column, the fixed plate is fixed to the bottom of the lower connecting plate through a plurality of connecting plates, a plurality of connecting plates distributed in an annular array are fixed at the circular arc edge of the fixed plate, and the connecting plates are in an inverted "L" shape;

[0017] All the connecting plates on the edge of the fixed plate together form an upper floating cavity. In order to ensure that the upper floating cavity is relatively closed, a soft plate made of high-temperature resistant material is used to cover the gap between two adjacent connecting plates to enhance the buoyancy that the upper floating part can generate in the flowing high-temperature flue gas, so as to drive the guide part to unfold.

[0018] In this technical solution, a plurality of inner floating platforms are fixed on the inner side wall of the connecting plate and are distributed at equal intervals in the vertical direction. The width of the inner floating platforms on the same connecting plate decreases from top to bottom in the horizontal direction. An outer floating platform is fixed on the outer side wall of the connecting plate.

[0019] All the inner floating platforms, whose widths decrease from top to bottom, are surrounded to form a three-dimensional pagoda-shaped cavity, so as to be better pushed by the high-temperature flue gas and generate sufficient buoyancy.

[0020] The outer floating platform and the inner floating platform are both hollow structures, and are filled with floating gas inside. The floating gas is preferably one of helium and neon. The inner and outer floating platforms can enhance the buoyancy of floating in high-temperature flue gas.

[0021] In the technical solution, there are two flow guides, and the two flow guides are symmetrically distributed with each other, and the flow guides are axially arranged perpendicular to the heat exchange tube.

[0022] The two symmetrically arranged guide parts guide the high-temperature flue gas in the air intake pipe to the two sides of the inner cavity of the shell after being unfolded.

[0023] In the technical solution, the guide part includes a long strip-shaped bearing plate, the bearing plate and the heat exchange tube are arranged perpendicular to each other, and a plurality of equally spaced guide plates are fixed on the bearing plate;

[0024] A first connecting member, the first connecting member is fixed at the bottom center of the bearing plate, the first connecting member is fixed to the end of the second connecting member, the other end of the second connecting member is rotatably connected to one end of the telescopic rod, the other end of the telescopic rod is rotatably connected to the driving rod, and the driving rod is fixed to the upper connecting plate. When the upper floating part does not move upward, the guide plate is arranged vertically or tends to be arranged vertically to prevent the guide plate from interfering with the flow of low-temperature smoke;

[0025] Both sides of the second connecting member are rotatably connected with fixing rods, the fixing rods are fixed on the mounting plate, and the mounting plate is fixed on the top of the bearing column.

[0026] During the unfolding process of the guide part, the guide plate changes from a vertical setting to an inclined setting, thereby guiding the high-temperature flue gas flowing from the air inlet pipe into the inner cavity of the shell to flow to both sides of the inner cavity of the shell.

[0027] In the technical solution, the heat conducting part is composed of one or more of the first heat conducting fins, the second heat conducting fins and the third heat conducting fins, and is evenly distributed along the axial direction of the heat exchange tube;

[0028] The first heat-conducting fin is in a single piece and is sleeved and fixed on the surface of the heat exchange tube. The first heat-conducting fin is in a circular or rectangular shape.

[0029] The second heat-conducting fins and the third heat-conducting fins are shell-shaped structures.

[0030] The contact area between the heat exchange tube and the high-temperature flue gas is enlarged through the heat conduction part, thereby improving the heat exchange efficiency and the heat exchange effect.

[0031] In the technical solution, the second heat-conducting fins include two circular heat-conducting fins, both of which are sleeved and fixed on the surface of the heat exchange tube, and the two heat-conducting fins are fixed to each other by two symmetrically arranged arc-shaped connecting skirts, and the two second heat-conducting fins and the two connecting skirts together form a first heat-conducting cavity;

[0032] The connecting skirt plate is located at the edge of the second heat-conducting fin, and the two connecting skirt plates form an air outlet and an air inlet at the top and bottom of the heat exchange cavity. The connecting skirt plate can be formed by brazing solder, that is, the middle and upper parts between the two second heat-conducting fins are brazed to form a connecting skirt plate.

[0033] In the present technical solution, a plurality of guide protrusions are fixed on the inner wall surface of one of the second heat-conducting fins constituting the same first heat-conducting cavity. The guide protrusions are streamlined in structure as a whole, and the guide protrusions, the inner wall of the second heat-conducting fin and the guide protrusions mutually form a guide channel. The guide channel guides the flue gas upward from bottom to top, and the guide protrusions are partially in an arc-shaped structure.

[0034] The guide protrusions can generate eddies in the flue gas entering the first heat-conducting cavity and lengthen the flue gas flowing through the first heat-conducting cavity, thereby improving the heat exchange effect.

[0035] In the technical solution, the third heat-conducting fin comprises an upper heat-conducting shell, the upper heat-conducting shell is a square shell structure, and the upper heat-conducting shell is sleeved and fixed on the surface of the heat exchange tube;

[0036] The lower heat-conducting shell is fixed to the bottom of the upper heat-conducting shell, the cross-section of the lower heat-conducting shell increases from top to bottom, and the upper heat-conducting shell and the lower heat-conducting shell together form a second heat-conducting cavity that passes through from top to bottom.

[0037] The shell-shaped second heat-conducting fins and the third heat-conducting fins form separate heat-conducting cavities on the surface of the heat-exchange tube. The first heat-conducting cavity and the second heat-conducting cavity prolong the time that the high-temperature flue gas stays on the surface of the heat-exchange tube, thereby improving the heat-exchange effect.

[0038] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0039] The positive and progressive effects of the present invention are:

[0040] The present invention improves the heat exchange efficiency. By providing a floating part that can move with the change of the rising force of the high-temperature flue gas, the guide part automatically adjusts its expansion degree according to the flue gas temperature. When the flue gas temperature is high, the expansion degree of the guide part increases, thereby guiding more high-temperature flue gas to flow to both sides of the inner cavity of the shell, and significantly extending the travel of the high-temperature flue gas in the inner cavity of the shell. In this way, the high-temperature flue gas can fully contact the heat exchange tube and its heat conduction part, greatly improving the heat exchange efficiency of the flue gas, effectively recovering the waste heat in the high-temperature flue gas, and improving the overall thermal energy utilization rate.

[0041] The present invention optimizes the flue gas flow path. Through the dynamic expansion of the guide part, the flow path of the high-temperature flue gas is optimized, so that it forms a uniform flow distribution inside the shell, avoiding the uneven heat exchange efficiency caused by the flue gas flowing in a certain area in the traditional structure. The design ensures full contact between the flue gas and the heat exchange structure, avoids heat energy waste and local overheating problems, thereby improving the reliability and life of the equipment.

[0042] At the same time, the intelligent control of flue gas flow rate is realized. By using the flue gas temperature to guide the expansion degree of the guide part, the adaptive control of flue gas flow rate is realized. When the flue gas temperature is high, the guide part is fully expanded, which increases the flow distance of the flue gas in the shell, thereby slowing down the flow rate of the high-temperature flue gas and prolonging its contact time with the heat exchange device; when the flue gas temperature is low, the expansion degree of the guide part is reduced, which reduces the flow resistance of the flue gas and avoids the decrease in heat exchange efficiency caused by the decrease in flue gas temperature. Through this dynamic control mechanism, the best heat exchange effect of the equipment under different working conditions is achieved.

[0043] The present invention achieves maximum thermal energy utilization to a certain extent. By regulating the flow path and speed of high-temperature flue gas, it can achieve maximum thermal energy utilization within a limited heat exchange space. It not only helps to reduce the energy waste caused by direct emission of high-temperature flue gas, but also can reduce the exhaust gas temperature, reduce thermal pollution and damage to the environment, and improve the environmental performance of the equipment.

[0044] The present invention utilizes the thermodynamic characteristics of high-temperature flue gas to achieve dynamic optimization of heat exchange efficiency without additional energy input. This adaptive design reduces energy consumption and achieves efficient recovery of flue gas waste heat, which is in line with the development trend of energy conservation and emission reduction and has significant environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the three-dimensional structure of the external whole of the present invention;

[0046] Figure 2 It is a schematic diagram of the overall top view of the present invention;

[0047] Figure 3 For the present invention Figure 2 A schematic diagram of the three-dimensional structure of the cross section at AA;

[0048] Figure 4 It is a schematic diagram of the top view structure of the cross-sectional view node at BB of the present invention;

[0049] Figure 5 For the present invention Figure 4 A schematic diagram of the local structure cut away at BB;

[0050] Figure 6 It is a partial cross-sectional structural schematic diagram of the flow mixing component of the present invention;

[0051] Figure 7 It is a schematic diagram of the overall three-dimensional structure of the flow mixing assembly of the present invention;

[0052] Figure 8 It is a schematic diagram of the overall structure of the first heat-conducting fin and the heat-exchange tube of the present invention;

[0053] Fig. 9It is a schematic diagram of the overall structure of the second heat-conducting fin and the heat exchange tube of the present invention;

[0054] Fig.10 It is a schematic diagram of the overall top view of the second heat-conducting fin and the heat exchange tube of the present invention;

[0055] Fig.11 For the present invention Fig.10 A schematic diagram of the three-dimensional structure of the cross section at CC;

[0056] Fig.12 It is a schematic diagram of the structure of the heat conducting sheet of the present invention;

[0057] Fig.13 It is a schematic diagram of the structure of a heat conducting sheet with flow guiding protrusions according to the present invention;

[0058] Fig.14 It is a schematic diagram of the overall structure of the third heat-conducting fin and the heat-exchange tube of the present invention;

[0059] Fig.15 It is a schematic diagram of the structure of a part of the third heat-conducting fin and the heat-exchange tube of the present invention;

[0060] Fig.16 It is a schematic structural diagram of a third heat-conducting fin and a heat-exchange tube from a side view of the present invention;

[0061] Fig.17 For the present invention Fig.16 A schematic diagram of the three-dimensional structure of the cross section at DD;

[0062] Fig.18 This is a schematic diagram of the lower heat-conducting shell structure of the present invention;

[0063] Fig.19 It is a schematic side view of the structure of the lower heat-conducting shell of the present invention;

[0064] Fig. 20 For the present invention Fig.19 Schematic diagram of the three-dimensional structure of the cross-section at EE.

[0065] Description of Reference Numerals

[0066] 1. Shell; 11. Air inlet pipe; 12. Air outlet pipe;

[0067] 2. Heat exchange tube;

[0068] 3. Water collecting tank;

[0069] 4. bearing column; 41. support rod; 42. sliding tube; 421. lower connecting plate; 422. upper connecting plate;

[0070] 5. floating part; 51. fixed plate; 52. connecting plate; 53. inner floating platform; 54. outer floating platform; 55. connecting piece;

[0071] 6. guide part; 61. bearing plate; 62. first connecting member; 63. second connecting member; 64. telescopic rod; 65. driving rod; 66. guide plate; 67. fixing rod; 68. mounting plate;

[0072] 7. The first heat conducting fin;

[0073] 8. second heat conducting fin; 81. heat conducting sheet; 82. first heat conducting cavity; 83. connecting skirt plate; 84. flow guiding protrusion;

[0074] 9. The third heat-conducting fin; 91. The upper heat-conducting shell; 92. The lower heat-conducting shell; 93. The second heat-conducting cavity. DETAILED DESCRIPTION

[0075] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0076] like Figure 1 , Figure 2 and Figure 3 As shown, the boiler waste heat utilization device comprises a shell 1, wherein a plurality of staggered heat exchange tubes 2 are arranged inside the shell 1, and the ends of the heat exchange tubes 2 are respectively connected to two water collecting tanks 3, wherein the water collecting tanks 3 are fixed on the outer wall of the shell 1, and the two water collecting tanks 3 are connected to the corresponding water circulation heating system;

[0077] The bottom and top of the shell 1 are respectively connected with an air inlet pipe 11 and an air outlet pipe 12, and the air inlet pipe 11 is connected to the flue gas outlet of the boiler;

[0078] A mixed flow component, which is arranged at the inner cavity of the air inlet pipe 11, and includes a floating part 5 and a guide part 6 which is transmission-connected to the floating part 5, wherein the floating part 5 slides in the vertical direction and drives the guide part 6 to expand and contract, and the floating part 5 is driven to float by the boiler flue gas;

[0079] The heat exchange tube 2 is provided with a heat conducting portion;

[0080] The air inlet pipe 11 is externally connected to an air pump, and the air pump is connected to a corresponding controller. The air pump is controlled by the controller to adjust the speed of the smoke flow, thereby performing electrical regulation to achieve dual regulation.

[0081] The floating part 5 in the mixed flow component moves upward under the push of the high-temperature boiler flue gas, thereby driving the guide part to expand. The expanded guide part can guide the high-temperature flue gas that has just entered the shell 1 to both sides of the inner cavity of the shell 1, increasing the stroke of the high-temperature flue gas inside the shell 1, so that the high-temperature flue gas can fully contact the heat exchange tube 2 and the heat conduction part on the heat exchange tube 2, thereby improving the heat exchange effect and preventing the high-temperature flue gas from flowing out of the inner cavity of the shell 1 too quickly.

[0082] The buoyancy of the floating part 5 comes from the lifting force brought by the high-temperature flue gas. The higher the flue gas temperature, the higher the height of the floating part 5, and the higher the expansion degree of the guide part, thereby guiding more flue gas to flow to both sides of the inner cavity of the shell 1. The expansion degree of the guide part is controlled by the temperature of the flue gas to avoid excessive expansion of the guide part, thereby reducing the outflow speed of the flue gas.

[0083] Embodiment 1

[0084] As one of the embodiments in this application, Figure 5 and Figure 7 As shown, the mixed flow assembly includes a bearing column 4, the bottom end of the bearing column 4 is fixed at the center of the inner cavity of the air intake pipe 11 through a support rod 41, and the bearing column 4 is arranged vertically;

[0085] The sliding tube 42 is slidably connected to the surface of the supporting column 4, and an upper connecting plate 422 and a lower connecting plate 421 are fixed to the top and bottom of the sliding tube 42 respectively, the upper connecting plate 422 is connected to the guide part 6, and the lower connecting plate 421 is connected to the floating part 5.

[0086] The sliding tube 42 slides on the surface of the vertically arranged bearing column 4 , thereby realizing power transmission between the floating part 5 and the guide part 6 .

[0087] Embodiment 2

[0088] As one of the embodiments in this application, Figure 5 and Figure 7 As shown, the floating part 5 includes a fixed plate 51 of an annular structure, the fixed plate 51 is arranged on the periphery of the bearing column 4, the fixed plate 51 is fixed to the bottom of the lower connecting plate 421 through a plurality of connecting pieces 55, and a plurality of connecting plates 52 distributed in an annular array are fixed at the arc-shaped edge of the fixed plate 51, and the connecting plates 52 are in an inverted "L" shape.

[0089] All the connecting plates 52 on the edge of the fixed plate 51 together form an upper floating cavity. In order to ensure that the upper floating cavity is relatively closed, a soft plate made of high-temperature resistant material is used to cover the gap between two adjacent connecting plates 52 to enhance the buoyancy that the upper floating part 5 can generate in the flowing high-temperature flue gas, so as to drive the guide part 6 to unfold.

[0090] A plurality of inner floating platforms 53 are fixed on the inner side wall of the connecting plate 52 and are distributed at equal intervals in the vertical direction. The width of the inner floating platforms 53 on the same connecting plate 52 decreases from top to bottom in the horizontal direction. An outer floating platform 54 is fixed on the outer side wall of the connecting plate 52 .

[0091] All the inner floating platforms 53 with decreasing widths from top to bottom surround a three-dimensional pagoda-shaped cavity so as to be better pushed by the high-temperature flue gas and generate sufficient buoyancy.

[0092] The outer floating platform 54 and the inner floating platform 53 are both hollow structures, and are filled with floating gas inside. The floating gas is preferably one of helium and neon. The inner and outer floating platforms 54 can enhance the buoyancy of floating in high-temperature flue gas.

[0093] Specifically, there are two flow guide parts 6 , and the two flow guide parts 6 are symmetrically distributed with each other. The flow guide parts 6 are axially arranged perpendicular to the heat exchange tube 2 .

[0094] The two symmetrically arranged guide parts 6 guide the high-temperature flue gas in the air inlet pipe 11 to the two sides of the inner cavity of the shell 1 after being unfolded.

[0095] Specifically, Figure 5 As shown, the guide portion 6 includes a long strip-shaped bearing plate 61, the bearing plate 61 and the heat exchange tube 2 are arranged perpendicular to each other, and a plurality of guide plates 66 distributed at equal intervals are fixed on the bearing plate 61;

[0096] A first connecting member 62, the first connecting member 62 is fixed at the bottom center of the bearing plate 61, the first connecting member 62 is fixed to the end of the second connecting member 63, the other end of the second connecting member 63 is rotatably connected to one end of the telescopic rod 64, the other end of the telescopic rod 64 is rotatably connected to the driving rod 65, and the driving rod 65 is fixed to the upper connecting plate 422. When the upper floating part 5 moves upward, the guide plate 66 is arranged vertically or tends to be arranged vertically to prevent the guide plate 66 from interfering with the flow of low-temperature flue gas;

[0097] Both sides of the second connecting member 63 are rotatably connected with fixing rods 67 , and the fixing rods 67 are fixed on a mounting plate 68 , and the mounting plate 68 is fixed on the top of the bearing column 4 .

[0098] When the floating part 5 moves upward, the lower connecting plate 421 connected to the floating part 5 drives the sliding tube 42 and the upper connecting plate 422 to move upward, and the upper connecting plate 422 moves upward to drive the driving rod 65 to move upward. In the process of moving upward, the driving rod 65 drives the second connecting member 63 to rotate on the end of the fixed rod 67 through the telescopic rod 64. The rotating second connecting member 63 drives the supporting plate 61 and the guide plate 66 on the supporting plate 61 to rotate toward one side away from the center of the intake pipe 11 through the first connecting member 62, and the guide part 6 is unfolded.

[0099] During the unfolding process of the guide part 6 , the guide plate 66 is changed from a vertical setting to an inclined setting, thereby guiding the high-temperature flue gas flowing into the inner cavity of the shell 1 from the air inlet pipe 11 to flow to both sides of the inner cavity of the shell 1 .

[0100] Each connecting component in this embodiment adopts a lightweight design, that is, it is made of lightweight high-temperature resistant materials, and at the same time, a through groove that does not affect the structural strength is opened on the connecting component.

[0101] Embodiment 3

[0102] As one of the embodiments in this application, Figures 8 to 20 As shown, the heat conducting part is composed of one or more of the first heat conducting fins 7, the second heat conducting fins 8 and the third heat conducting fins 9, and is evenly distributed along the axial direction of the heat exchange tube 2;

[0103] The first heat-conducting fin 7 is in a single piece and is sleeved and fixed on the surface of the heat exchange tube 2. The first heat-conducting fin 7 is in a circular or rectangular shape.

[0104] The second heat conducting fins 8 and the third heat conducting fins 9 are shell-shaped structures.

[0105] The contact area between the heat exchange tube 2 and the high-temperature flue gas is enlarged by the heat conduction part, thereby improving the heat exchange efficiency and the heat exchange effect.

[0106] Furthermore, the second heat-conducting fins 8 include two circular heat-conducting fins 81, and the two heat-conducting fins 81 are both sleeved and fixed on the surface of the heat exchange tube 2, and the two heat-conducting fins 81 are fixed to each other by two symmetrically arranged arc-shaped connecting skirts 83, and the two second heat-conducting fins 8 and the two connecting skirts 83 together form a first heat-conducting cavity 82;

[0107] The connecting skirt plate 83 is located at the edge of the second heat-conducting fin 8, and the two connecting skirt plates 83 form an air outlet and an air inlet at the top and bottom of the heat exchange chamber. The connecting skirt plate 83 can be formed by brazing solder, that is, the middle and upper parts between the two second heat-conducting fins 8 are brazed to form the connecting skirt plate 83.

[0108] like Fig.12 As shown, the air inlet is large and the air outlet is small, so the smoke entering the first heat conduction cavity 82 will not flow out of the first heat conduction cavity 82 quickly, thereby prolonging the heat exchange time.

[0109] Specifically, a plurality of guide protrusions 84 are fixed to the inner wall surface of one of the second heat-conducting fins 8 constituting the same first heat-conducting cavity 82. The guide protrusions 84 are streamlined in structure as a whole, and the guide protrusions 84 and the inner wall of the second heat-conducting fin 8 and the guide protrusions 84 mutually form a guide channel. The guide channel guides the flue gas upward from bottom to top, and the guide protrusions 84 are partially arc-shaped in structure.

[0110] The guide protrusions 84 can generate eddies in the flue gas entering the first heat-conducting cavity 82 and lengthen the flue gas flowing through the first heat-conducting cavity 82 , thereby improving the heat exchange effect.

[0111] The third heat-conducting fin 9 includes an upper heat-conducting shell 91, which is a square shell structure. The upper heat-conducting shell 91 is sleeved and fixed on the surface of the heat exchange tube 2;

[0112] The lower heat-conducting shell 92 is fixed to the bottom of the upper heat-conducting shell 91, and the cross-section of the lower heat-conducting shell 92 increases from top to bottom. Fig.18 As shown, the upper heat-conducting shell 91 and the lower heat-conducting shell 92 together form a second heat-conducting cavity 93 that passes through from top to bottom.

[0113] The second heat conducting cavity 93 is also provided with a flow guiding protrusion 84 inside, and the flow guiding protrusion 84 of the second heat conducting cavity 93 is not shown in the figure.

[0114] In summary, the shell-shaped second heat-conducting fins 8 and the third heat-conducting fins 9 form separate heat-exchange cavities on the surface of the heat-exchange tube 2. The first heat-conducting cavity 82 and the second heat-conducting cavity 93 prolong the time that the high-temperature flue gas stays on the surface of the heat-exchange tube 2, thereby improving the heat exchange effect.

[0115] The second heat conducting fin 8 and the third heat conducting fin 9 are preferably placed in the middle of the heat exchange tube 2, because the temperature at the center of the inner cavity of the shell 1 is higher and the flue gas flows faster, which will not affect the exhaust of the flue gas too much.

[0116] The first heat-conducting fins 7 are suitable for being placed on both sides of the heat exchange tube 2 , and the first heat-conducting fins 7 are also suitable for being placed on the heat exchange tube 2 on the side away from the air inlet pipe 11 .

[0117] The present invention is not limited to the above-mentioned embodiments. Any changes in shape or structure are within the protection scope of the present invention. The protection scope of the present invention is defined by the attached claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are within the protection scope of the present invention.

Claims

1. A boiler waste heat utilization device, comprising a shell (1), wherein a plurality of staggered heat exchange tubes (2) are arranged inside the shell (1), wherein the ends of the heat exchange tubes (2) are respectively connected to two water collecting tanks (3), and the water collecting tanks (3) are fixed to the outer wall of the shell (1). The bottom and top of the housing (1) are respectively connected to an air inlet pipe (11) and an air outlet pipe (12), and are characterized in that: A mixed flow component, the mixed flow component being arranged at the inner cavity of the air inlet pipe (11), the mixed flow component comprising a floating portion (5) and a flow guide portion (6) drivingly connected to the floating portion (5), the floating portion (5) sliding in the vertical direction and driving the flow guide portion (6) to expand and contract, the floating portion (5) being driven by boiler flue gas to float upward; The heat exchange tube (2) is provided with a heat conducting portion; The mixed flow assembly comprises a bearing column (4), the bottom end of the bearing column (4) being fixed at the center of the inner cavity of the air intake pipe (11) via a support rod (41), and the bearing column (4) being arranged in a vertical direction; A sliding tube (42), the sliding tube (42) being slidably connected to the surface of the bearing column (4), an upper connecting plate (422) and a lower connecting plate (421) being fixed to the top and bottom of the sliding tube (42), respectively, the upper connecting plate (422) being connected to the guide portion (6), and the lower connecting plate (421) being connected to the floating portion (5).

2. The boiler waste heat utilization device according to claim 1, characterized in that: The floating portion (5) comprises a fixing plate (51) of an annular structure, the fixing plate (51) being arranged at the periphery of the bearing column (4), the fixing plate (51) being fixed to the bottom of the lower connecting plate (421) via a plurality of connecting plates (55), a plurality of connecting plates (52) distributed in an annular array being fixed at the circular arc edge of the fixing plate (51), the connecting plates (52) being in an inverted "L"-shaped structure; All the connecting plates (52) on the edge of the fixing plate (51) together form an upper floating cavity.

3. The boiler waste heat utilization device according to claim 2, characterized in that: A plurality of inner floating platforms (53) are fixed on the inner side wall of the connecting plate (52) and are distributed at equal intervals in the vertical direction. The width of the inner floating platforms (53) on the same connecting plate (52) decreases in the horizontal direction from top to bottom. An outer floating platform (54) is fixed on the outer side wall of the connecting plate (52).

4. The boiler waste heat utilization device according to claim 1, characterized in that: There are two flow guide portions (6), and the two flow guide portions (6) are symmetrically distributed with respect to each other. The flow guide portions (6) are axially arranged perpendicularly to the heat exchange tube (2).

5. The boiler waste heat utilization device according to claim 3, characterized in that: The flow guide portion (6) comprises a long strip-shaped bearing plate (61), the bearing plate (61) and the heat exchange tube (2) are arranged perpendicular to each other, and a plurality of flow guide plates (66) distributed at equal intervals are fixed on the bearing plate (61); a first connecting member (62), the first connecting member (62) being fixed at the bottom center of the carrying plate (61), the first connecting member (62) being fixed to an end of a second connecting member (63), the other end of the second connecting member (63) being rotatably connected to one end of a telescopic rod (64), the other end of the telescopic rod (64) being rotatably connected to a driving rod (65), and the driving rod (65) being fixed to an upper connecting plate (422); Both sides of the second connecting member (63) are rotatably connected to fixing rods (67), the fixing rods (67) are fixed on a mounting plate (68), and the mounting plate (68) is fixed on the top of the bearing column (4).

6. The boiler waste heat utilization device according to claim 1, characterized in that: The heat conduction part is composed of one or more of a first heat conduction fin (7), a second heat conduction fin (8) and a third heat conduction fin (9), and is evenly distributed along the axial direction of the heat exchange tube (2); The first heat-conducting fin (7) is in a single-piece shape and is sleeved and fixed on the surface of the heat exchange tube (2); the first heat-conducting fin (7) is in a circular shape or a rectangular shape; The second heat-conducting fin (8) and the third heat-conducting fin (9) are shell-shaped structures.

7. The boiler waste heat utilization device according to claim 6, characterized in that: The second heat-conducting fins (8) comprise two circular heat-conducting fins (81), the two heat-conducting fins (81) are both sleeved and fixed on the surface of the heat exchange tube (2), the two heat-conducting fins (81) are fixed to each other via two symmetrically arranged arc-shaped connecting skirts (83), and the two second heat-conducting fins (8) and the two connecting skirts (83) together enclose a first heat-conducting cavity (82).

8. The boiler waste heat utilization device according to claim 7, characterized in that: A plurality of flow-guiding protrusions (84) are fixed to the inner wall surface of one of the second heat-conducting fins (8) constituting the same first heat-conducting cavity, and the flow-guiding protrusions (84), the inner wall of the second heat-conducting fin (8) and the flow-guiding protrusions (84) mutually enclose a flow-guiding channel, and the flow-guiding protrusions (84) are partially in an arc-shaped structure.

9. The boiler waste heat utilization device according to claim 8, characterized in that: The third heat-conducting fin (9) comprises an upper heat-conducting shell (91), the upper heat-conducting shell (91) being a square-shaped shell structure, and the upper heat-conducting shell (91) is sleeved and fixed on the surface of the heat exchange tube (2); A lower heat-conducting shell (92), the lower heat-conducting shell (92) being fixed to the bottom of the upper heat-conducting shell (91), the cross-section of the lower heat-conducting shell (92) increasing from top to bottom, and the upper heat-conducting shell (91) and the lower heat-conducting shell (92) together forming a second heat-conducting cavity (93) that is through-connected from top to bottom.

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