A kind of spoiler for fire tube boiler heat exchange pipe

Abstract

This utility model provides a flow-turbulence device for heat exchange tubes in a fire-tube boiler, comprising: a sleeve assembly, a flow-turbulence component, and a tie rod. The sleeve assembly includes: a sleeve member and a first blade group. The sleeve member is sleeved over the first blade group. The first blade group includes: helical blades and a core member. The helical blades are spaced around the core member to define several helical air ducts within the sleeve member. The core member is fixed to the tie rod. The flow-turbulence component includes: a sleeve member and a second blade group. The sleeve member is sleeved over the second blade group. The second blade group has a similar structure to the first blade group to define several helical air ducts within the sleeve member. The sleeve assembly and the flow-turbulence component are connected in series via the tie rod, with the sleeve assembly and the flow-turbulence component spaced apart on the tie rod. This improves the heat transfer coefficient inside the heat exchange tubes of the fire-tube boiler and reduces the required heat exchange area of ​​the equipment.

Description

Technical Field

[0001] This utility model relates to the field of sulfur recovery technology, and in particular to a turbulence device for heat exchange tubes of fire-tube boilers used for sulfur recovery. Background Technology

[0002] In existing sulfur recovery processes, when a fire-tube boiler is running, high-temperature flue gas flows through the heat exchange tubes, heating the saturated water and steam-water mixture outside the tubes. The heat transfer process during operation is as follows: the hot flue gas releases heat to the inner wall of the tubes via convection, the inner wall of the tubes conducts heat to the outer wall of the tubes, and the outer wall of the tubes releases heat to the medium outside the tubes.

[0003] The inventor considered that the heat transfer equation is Where Q is the amount of heat transferred, K is the heat transfer coefficient, and A is the heat transfer area. The average temperature difference is given. And the heat transfer coefficient is... Where hi is the convective heat transfer coefficient of the inner membrane of the tube, ho is the convective heat transfer coefficient of the outer membrane of the tube, di and do are the inner and outer diameters of the heat exchange tube, and λ is the thermal conductivity of the tube wall material. Analysis of the above formula shows that, with a fixed amount of heat transfer, increasing the heat transfer coefficient can reduce the required heat exchange area of ​​the equipment.

[0004] However, in conventional designs, the heat exchange tubes of fire-tube boilers are typically seamless steel tubes with smooth inner walls. Therefore, flue gas flows directly through the tubes, which are completely submerged in water. This results in the inner membrane heat transfer coefficient being much smaller than the outer membrane heat transfer coefficient. As shown in the formula for calculating the heat transfer coefficient K, the side with the smaller heat transfer coefficient determines the overall heat transfer coefficient. Therefore, this conventional design leads to a lower heat transfer coefficient of flue gas to the inner wall of the tubes, making the overall heat transfer coefficient of existing conventional fire-tube boiler designs less than ideal. Utility Model Content

[0005] Therefore, the main objective of this utility model is to provide a turbulence device for heat exchange tubes in fire-tube boilers, so as to improve the heat transfer coefficient inside the heat exchange tubes of fire-tube boilers and reduce the heat exchange area required by the equipment.

[0006] To achieve the above objectives, according to one aspect of the present invention, a turbulence-inducing device for heat exchange tubes of a fire-tube boiler is provided, comprising: a sleeve assembly, a turbulence-inducing component, and a tie rod. The sleeve assembly includes: a sleeve member and a first blade group. The sleeve member is sleeved outside the first blade group. The first blade group includes: helical blades and a core member. The helical blades are arranged at intervals around the core member to define a plurality of helical air ducts within the sleeve member. The core member is fixed to the tie rod. The turbulence-inducing component includes: a sleeve member and a second blade group. The sleeve member is sleeved outside the second blade group. The second blade group has a similar structure to the first blade group to define a plurality of helical air ducts within the sleeve member. The sleeve assembly and the turbulence-inducing component are connected in series via the tie rod, so that the sleeve assembly and the turbulence-inducing component are arranged at intervals on the tie rod.

[0007] Preferably, the distance between the sleeve assembly and the turbulence-disrupting assembly is ≥1.5m.

[0008] Preferably, there are multiple turbulence components, and each turbulence component is arranged in series at intervals on the tie rod.

[0009] Preferably, the spacing between each of the turbulence components is ≥1.5m.

[0010] Preferably, the outer tube of the sleeve is provided with a retaining ring, and the diameter of the retaining ring is larger than the diameter of the inner tube of the heat exchange tube.

[0011] Preferably, the outer surface of the sleeve is covered with a refractory filler.

[0012] Preferably, the outer cylinder surface of the sleeve is covered with refractory filler.

[0013] Preferably, the shaft core of the second blade group and the first blade group is provided with shaft holes for interlocking with the tie rod in a clearance fit, and the gap is filled with refractory filler.

[0014] Preferably, the length of the sleeve is less than that of the tube and greater than or equal to the length of the second blade group.

[0015] The turbulence device for heat exchange tubes in fire-tube boilers provided by this utility model can cleverly change the flow field inside the heat exchange tube when inserted into it, causing the fluid to rotate, increasing the local flue gas velocity and the intensity of flue gas turbulence, thereby increasing the Reynolds number and improving the inner membrane heat transfer coefficient. This improves the heat transfer efficiency, and can significantly reduce the heat exchange area required for the equipment, as well as reduce the equipment size, the required floor space, and the initial investment cost. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the turbulence-inducing device for heat exchange tubes in a fire-tube boiler according to this utility model.

[0018] Figure 2 This is a half-sectional schematic diagram of the turbulence-inducing device for heat exchange tubes in a fire-tube boiler according to the present invention.

[0019] Figure 3 This is a schematic diagram of the assembly structure of the turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to the present invention.

[0020] Figure 4This is a schematic diagram of the first blade group of the turbulence device for heat exchange tubes of a fire-tube boiler according to the present invention.

[0021] Figure 5 This is a half-sectional view of the turbulence device of this utility model for use in heat exchange tubes of fire-tube boilers when inserted into the heat exchange tubes.

[0022] Figure 6 for Figure 5 The schematic diagram of the half-section structure in the AA direction shows the cooperation structure between the turbulence component and the heat exchange tube.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Sleeve assembly, 2. Turbulence assembly, 3. Tie rod, 8. Refractory fiber paper, 9. Heat exchange tube, 11. Sleeve fitting, 12. First blade group, 13. Snap ring, 21. Sleeve fitting, 22. Second blade group, 121. Spiral blade, 122. Shaft core, 123. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0029] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "lay out," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances and in conjunction with existing technology. Furthermore, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. One or more of the components shown in the figures may be necessary or not, and the relative positional relationships between the components shown in the figures can be adjusted according to actual needs.

[0031] Observations have shown that in a conventional smooth heat exchanger tube 9, the inner film heat transfer coefficient (hi) can be calculated using classical heat transfer correlations: , , (Reynolds number) (Prändt number), where d is the pipe diameter, k is the thermal conductivity of the fluid, ρ, μ, These represent the fluid's density, viscosity, and specific heat capacity, respectively. From the formula, it can be seen that an effective way to improve the internal membrane heat transfer coefficient is to increase the Reynolds number Re.

[0032] Therefore, this utility model attempts to change the flow field inside the pipe by designing a turbulence device, so as to make the fluid rotate, increase the local flue gas velocity and flue gas turbulence intensity, thereby increasing the Reynolds number Re, so as to enhance heat transfer and reduce the required heat exchange area.

[0033] However, during the design process, the inventors discovered that in sulfur recovery fire-tube boilers, the flue gas temperature can reach up to 1350℃. If the turbulence device is designed as a continuous spiral structure made of thin steel plate twisted together, and its length is equal to or slightly shorter than that of the heat exchange tube 9, the pressure drop of the flue gas in the tube will be greatly increased due to the length of the turbulence device, thus increasing the energy consumption of the fan. At the same time, the high-temperature resistance of the steel plate is also insufficient. Therefore, this solution is not suitable for scenarios with very high flue gas temperatures.

[0034] Therefore, such as Figures 1 to 6 As shown, this utility model proposes a turbulence-inducing device for heat exchange tubes in a fire-tube boiler, which includes: a sleeve assembly 1, a turbulence-inducing assembly 2, and a tie rod 3, wherein, as shown... Figures 1 to 3 As shown, the sleeve assembly 1 and the turbulence-disrupting assembly 2 are connected in series at intervals via tie rods 3, and are used as follows: Figure 5 As shown, it is inserted into the heat exchange tube 9 of the fire-tube boiler as a whole, with only the sleeve assembly 1 exposed.

[0035] Specifically, such as Figures 1 to 3 As shown, the sleeve assembly 1 in this example includes: a sleeve 11 and a first blade group 12. In this example, the sleeve 11 and the first blade group 12 are preferably made of corundum material to achieve a refractoriness of 1850°C. In addition, in order to facilitate the insertion of the limiting and turbulence-disrupting device into the heat exchange tube 9, in an optional embodiment, a retaining ring 13 is provided on the outer tube of the sleeve 11, the diameter of which is larger than the inner tube diameter of the heat exchange tube 9, so as to limit the sleeve 11 from being partially inserted into the heat exchange tube 9 and the other part extending out of the heat exchange tube 9.

[0036] Among them, such as Figures 1 to 2 As shown, in this example, the sleeve 11 is fitted over the first blade group 12, wherein... Figure 4 As shown, the first blade group 12 includes: a spiral blade 121 and a shaft core 122. The spiral blade 121 is spirally arranged around the shaft core 122 at intervals to define a plurality of spiral air ducts within the sleeve 11. The shaft core 122 is provided with a shaft hole 123 for insertion into the pull rod 3 and fixed at both ends by nuts. In addition, in order to prevent the shaft core 122 from being damaged due to heat absorption and expansion during operation, in an optional example, the shaft hole 123 can be designed to be inserted into the pull rod 3 with a clearance fit, and the gap is filled with fire-resistant fiber paper 8 to prevent thermal expansion damage caused by the inconsistency of the expansion coefficients of the two during operation.

[0037] Among them, such as Figures 1 to 2 As shown, the turbulence-disrupting assembly 2 includes: a sleeve 21 and a second blade group 22. The sleeve 21 and the second blade group 22 are preferably made of corundum material, and the length of the sleeve 21 is less than that of the sleeve 11 and greater than or equal to the length of the second blade group 22. The sleeve 21 is fitted over the second blade group 22, and the second blade group 22 has a similar structure to the first blade group 12, defining several spiral air ducts within the sleeve 21. These ducts are connected in series via tie rods 3, allowing the sleeve assembly 1 and the turbulence-disrupting assembly 2 to be arranged at intervals on the tie rods 3.

[0038] Furthermore, in a preferred embodiment, there are multiple turbulence components 2, and each turbulence component 2 is arranged in series at intervals on the tie rod 3. For example, according to the total length of the furnace tube, one turbulence component 2 is arranged every ≥1.5m. This can maintain the effect of flue gas swirl, improve heat exchange efficiency, and prevent excessive pressure drop on the flue gas side.

[0039] Furthermore, such as Figures 5 to 6 As shown, in order to prevent thermal expansion damage caused by the inconsistency in the expansion coefficients of the sleeve fitting 11, the sleeve fitting 21 and the heat exchange tube 9 under working conditions, in an optional embodiment, refractory fiber-filled paper is laid on the outer tube surface of the sleeve fitting 11 and the outer cylinder surface of the sleeve fitting 21 to fill the fitting gap between the sleeve fitting 11, the sleeve fitting 21 and the heat exchange tube 9, thereby preventing damage to the turbulence device.

[0040] The turbulence device set up in the above example can be used by inserting the series-connected sleeve assembly 1 and turbulence assembly 2 into the heat exchange tube 9 of the fire-tube boiler. When disassembling, the sleeve assembly 1 can be pulled out, and the turbulence assembly 2 can be driven out of the heat exchange tube 9 by the pull rod 3, which is convenient for regular maintenance and replacement.

[0041] This design, by incorporating a turbulence-inducing device within the heat exchange tube 9, achieves flue gas swirl while protecting the tube, altering the flow field within the tube, causing fluid rotation, increasing local flue gas velocity, and enhancing flue gas turbulence intensity. This, in turn, increases the Reynolds number, strengthens heat transfer, and ultimately reduces the required heat exchange area. Furthermore, by placing the turbulence-inducing components 2 every ≥1.5m within the heat exchange tube 9, the swirl effect is maintained without excessively increasing the flue gas pressure drop, thus preventing excessive energy consumption. This approach improves the boiler's heat transfer coefficient, reduces equipment size, and avoids excessively high flue gas pressure drop.

[0042] In summary, the turbulence device for heat exchange tubes in fire-tube boilers provided by this utility model can cleverly change the flow field inside the heat exchange tube 9 when inserted into it, causing the fluid to rotate, increasing the local flue gas velocity and the intensity of flue gas turbulence, thereby increasing the Reynolds number and improving the inner membrane heat transfer coefficient. This improves the heat transfer efficiency, significantly reduces the required heat exchange area, and reduces the equipment size, required floor space, and initial investment cost.

[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0044] Furthermore, various different implementation methods of this utility model can be arbitrarily combined, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A turbulence-inducing device for heat exchange tubes in a fire-tube boiler, characterized in that... include: The sleeve assembly, the turbulence-disrupting assembly, and the tie rod are provided. The sleeve assembly includes a sleeve fitting and a first blade group. The sleeve fitting is fitted over the first blade group. The first blade group includes helical blades and a core member. The helical blades are arranged at intervals around the core member to define several helical air ducts within the sleeve fitting. The core member is fixed to the tie rod. The turbulence-disrupting assembly includes a sleeve fitting and a second blade group. The sleeve fitting is fitted over the second blade group. The second blade group has a similar structure to the first blade group to define several helical air ducts within the sleeve fitting. The sleeve assembly and the turbulence-disrupting assembly are connected in series via the tie rod, so that the sleeve assembly and the turbulence-disrupting assembly are arranged at intervals on the tie rod.

2. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The distance between the sleeve assembly and the turbulence-disrupting assembly is ≥1.5m.

3. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The turbulence-disrupting components are multiple, and each turbulence-disrupting component is arranged in series at intervals on the tie rod.

4. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 3, characterized in that, The spacing between each of the aforementioned turbulence components is ≥1.5m.

5. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The outer tube of the sleeve is provided with a retaining ring, the diameter of which is larger than the diameter of the inner tube of the heat exchange tube.

6. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The outer surface of the sleeve is covered with refractory filler.

7. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The outer cylinder surface of the sleeve is covered with refractory filler.

8. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The second blade group and the shaft core of the first blade group are provided with shaft holes to be inserted into the tie rod with a clearance fit, and the gap is filled with refractory filler.

9. The turbulence-disrupting device for heat exchange tubes in a fire-tube boiler according to claim 1, characterized in that, The length of the sleeve is less than that of the sleeve but greater than or equal to the length of the second blade group.

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