Steam generating equipment and heat exchange tube thereof

Abstract

The heat exchange tube for the steam generation equipment comprises an outer tube body, an inner tube body, an inner tube body, an inner tube body and a heat exchanger, the turbulent flow structure is arranged in the outer pipe body, and the turbulent flow structure is located at the position below 80% of the height of the outer pipe body. The heat exchange tube further comprises a gas-liquid separation structure arranged in the outer tube body. The turbulent flow structure is positioned below the gas-liquid separation structure; preferably, the gas-liquid separation structure is located at the upper end of the outer pipe body. According to the steam generation equipment and the heat exchange tube thereof, the turbulence degree of flowing of an internal medium (water / steam) can be increased, so that bubbles on the wall surface of the heat exchange tube are separated more easily, and the heat exchange reliability is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of steam generation, and particularly to a steam generation device and a heat exchange tube thereof. Background Art

[0002] Under the call of national energy conservation and emission reduction, steam generation devices are accelerating towards high-efficiency and low-emission fully premixed condensing types. Especially the cross-flow steam generator, which has a faster steam production speed compared to traditional steam boilers, can have a water volume of less than 30 liters, has no safety hazards, and does not require regular annual inspections. It is widely favored by the market and is widely used in national production and life, such as hotels, guesthouses, food, textiles, chemicals, feeds, and other industries.

[0003] However, when a small-volume steam boiler generates steam under low pressure and high load, the steam saturation temperature corresponding to the pressure is low. Thus, at high load, the high temperature of the heat exchange tube wall will cause a steam film to form on the inner wall of the tube, hindering heat transfer, resulting in the heat exchange tube accumulating heat and rising in temperature, and finally over-temperature alarm or material failure. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a steam generation device and a heat exchange tube thereof, which can increase the turbulence degree of the internal medium (water / steam) flow, thereby making the bubbles on the heat exchange tube wall easier to detach, and improving the reliability of heat transfer.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] A heat exchange tube for a steam generation device, comprising:

[0007] An outer tube body;

[0008] A flow disturbance structure disposed inside the outer tube body, and the flow disturbance structure is located at a position below 80% of the height of the outer tube body.

[0009] As a preferred embodiment, it further comprises: a gas-liquid separation structure disposed inside the outer tube body; the flow disturbance structure is located below the gas-liquid separation structure; preferably, the gas-liquid separation structure is located at the upper end of the outer tube body.

[0010] As a preferred embodiment, the flow disturbance structure includes spiral fins spirally extending along the axial direction of the outer tube body; preferably, the distribution length of the spiral fins in the axial direction is more than 0.1 times the length of the outer tube body, and preferably, the outer diameter of the spiral fins is less than or equal to the inner diameter of the outer tube body.

[0011] As a preferred embodiment, the axial projection of the spiral fins is a solid circle or a ring structure.

[0012] As a preferred embodiment, the pitch of the spiral fins is between 5 mm and 30 mm.

[0013] As a preferred embodiment, the difference between the outer diameter of the spiral fin and the inner diameter of the outer tube body is between 0 and 10 mm.

[0014] As a preferred embodiment, a flow disturbance ring is sleeved outside the spiral fin; the flow disturbance ring is sleeved between the inner wall of the outer tube body and the spiral fin; preferably, the flow disturbance ring is movably sleeved between the inner wall of the outer tube body and the spiral fin.

[0015] As a preferred embodiment, the cross-section of the flow disturbance ring is circular, and the wire diameter of the flow disturbance ring is 0.1 - 2 mm.

[0016] As a preferred embodiment, an inner rod is provided inside the outer tube body; a water storage space is formed between the outer wall of the inner rod and the inner wall of the outer tube body; the inner rod is more than 20% of the length of the outer tube body; the spiral fin is fixedly connected to the outer wall of the inner rod and spirally extends on the outer wall of the inner rod; further, the spiral fin continuously spirally extends on the outer wall of the inner rod with a length more than 0.3 times; preferably, the inner rod includes a flow disturbance section provided with the spiral fin and a smooth wall section not provided with the spiral fin; the smooth wall section is located below the flow disturbance section.

[0017] As a preferred embodiment, the flow disturbance structure includes flow disturbance protrusions protruding radially on the outer wall of the inner rod or the inner wall of the outer tube body.

[0018] A steam generating device includes a heat exchange tube as described in any one of the above.

[0019] Beneficial effects:

[0020] For the steam generating device and its heat exchange tube provided in the present application, by adding a flow disturbance structure inside the tube, the turbulence degree of the internal medium (water / steam) flow can be increased, and the bubbles on the wall surface are more likely to break away, improving the reliability of heat exchange.

[0021] Referring to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0022] Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments.

[0023] It should be emphasized that the term "comprising / including" as used herein refers to the presence of features, whole parts, steps or components, but does not exclude the presence or addition of one or more other features, whole parts, steps or components. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a cross-sectional view of a heat exchange tube provided by an embodiment of the present application;

[0026] Figure 2 is a three-dimensional structure diagram of a heat exchange tube provided by another embodiment of the present application;

[0027] Figure 3 is Figure 2 a schematic diagram of the gas-liquid separation structure;

[0028] Figure 4 is Figure 2 a schematic diagram of the spiral fin and spiral ring structure; Detailed Description of the Embodiments

[0029] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are for the purpose of describing specific embodiments only and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] Please refer to Figure 1 , an embodiment of this application provides a heat exchange tube for a steam generating device. This heat exchange tube can be applied to a cross-flow steam generator and used as a vertical heat exchange tube. Specifically, this heat exchange tube includes: an outer tube body 1; a flow disturbing structure disposed inside the outer tube body 1. The flow disturbing structure is located at a position below 80% of the height of the outer tube body 1. This flow disturbing structure can form a blockage to at least part of the steam-water fluid flowing along the length direction of the heat exchange tube. Under the action of this blocking and flow disturbing effect, the turbulence degree of the steam-water fluid increases, and bubbles are more likely to detach from the wall surface.

[0033] In this embodiment, this heat exchange tube further includes: a gas-liquid separation structure 4 disposed inside the outer tube body 1. The flow disturbing structure is located below the gas-liquid separation structure 4. The gas-liquid separation structure 4 is located at the upper end of the outer tube body 1. By arranging a steam-water separation structure inside the heat exchange tube, the steam-water fluid formed by evaporation can perform a primary gas-liquid separation inside the heat exchange tube, directly separating water and steam inside the heat exchange tube, improving the steam dryness, and eliminating the need to arrange a downcomer. The gas-liquid separation structure 4 can refer to Figure 3 as shown, which has a spiral plate 42 and a support inner rod 41 for fixing the spiral plate 42.

[0034] The gas-liquid separation structure 4 in this embodiment can refer to the gas-liquid separation structure of the heat exchange tube disclosed in the publication number CN114508745A, and the repeated parts will not be described again.

[0035] As Figure 1 shown, the flow disturbing structure includes a spiral fin 3 that spirally extends axially along the outer tube body 1. The spiral fin 3 can be a continuously extending integral continuous sheet body, or can also be a multi-segment sheet body structure that is discontinuously arranged in the spiral direction. This application does not make any restrictions. In this embodiment, the spiral fin 3 is an integral sheet body, which spirally extends continuously along the axis. For a better flow disturbing effect, the distribution length of the spiral fin 3 in the axial direction is more than 0.1 times the length of the outer tube body 1.

[0036] The axial projection of the spiral fin 3 is a solid circle or a ring structure. The pitch of the spiral fin 3 is between 5 mm and 30 mm. The outer diameter of the spiral fin 3 is less than or equal to the inner diameter of the outer tube body 1. Specifically, the difference between the (overall) outer diameter of the spiral fin 3 and the inner diameter of the outer tube body 1 is between 0 and 10 mm.

[0037] As Figure 1 shown, an inner rod 2 is provided inside the outer tube body 1. The inner rod 2 is a blind tube. A water storage space is formed between the outer wall of the inner rod 2 and the inner wall of the outer tube body 1; the inner rod 2 is more than 20% of the length of the outer tube body 1; the spiral fin 3 is fixedly connected to the outer wall of the inner rod 2 and spirally extends on the outer wall of the inner rod 2. At this time, the axial projection (axial perpendicular projection) of the spiral fin 3 is an annular structure. The spiral fin 3 is located in the upper middle part of the inner rod 2, and similarly, in the upper middle part of the entire heat exchange tube.

[0038] The spiral fin 3 continuously spirally extends on the outer wall of the inner rod 2 with a length of more than 0.3 times. The spiral fin 3 extends upward without exceeding the top end of the inner rod 2. Specifically, the inner rod 2 includes a turbulent flow section 5 provided with the spiral fin 3 and a smooth wall section 6 not provided with the spiral fin 3; the smooth wall section 6 is located below the turbulent flow section 5. The inner rod 2 and the spiral fin 3 are located below the gas-liquid separation structure 4, and there is a vacant area 20 between them to facilitate steam production. The inner rod 2 extends upward from the lower end of the outer tube body 1; the upper end of the inner rod 2 is a free end; the inner rod 2 is located below the gas-liquid separation structure 4. The inner rod 2 is provided with a connecting ring plate 9 below the spiral fin 3 to fixedly connect the inner wall of the outer tube body 1, and the inner rod 2 is coaxially arranged in the middle of the outer tube body 1 through the connecting ring plate 9.

[0039] The inner rod 2 in this embodiment can also refer to the inner rod of the heat exchange tube disclosed in the publication number CN114508745A, and the repeated parts will not be elaborated.

[0040] In the embodiment as Figures 2 to 4 shown, the axial projection of the spiral fin 3 is a solid circular structure, and it does not need to be provided with the inner rod 2. It forms a turbulent flow structure as a whole and provides a spiral rising channel 7 for the steam-water fluid to rise. To increase the turbulent flow effect, as Figure 4 shown, a turbulent flow ring 15 is sleeved outside the spiral fin 3. The turbulent flow ring 15 is in the structure of a spiral spring or a cylindrical spring. The turbulent flow ring 15 is sleeved between the inner wall of the outer tube body 1 and the spiral fin 3.

[0041] The turbulent flow ring 15 is movably sleeved between the inner wall of the outer tube body 1 and the spiral fin 3. In this embodiment, the turbulent flow ring 15 in the axial direction (the length direction of the outer tube body 1) of the spiral fin 3 can move up and down after the oncoming flow, and then form a disturbance and scrape on the inner wall of the outer tube body 1, avoiding the generation of a steam film, improving the heat exchange efficiency, and avoiding overheating of the heat exchange tube. Among them, the cross-section of the ring wire of the turbulent flow ring 15 is circular, and the diameter (thickness) of the ring wire of the turbulent flow ring 15 is 0.1 - 2 mm.

[0042] The spoiler ring 15 can be elastic, and thus its shape in the axial direction can move under the impact of the gas-liquid incoming flow. The spoiler ring 15 itself can form axial elastic telescopic vibration, thereby dispersing the steam film, making it easier for the heat exchange tube wall to exchange heat with the internal fluid, and avoiding the generation of overheating problems of the heat exchange tube.

[0043] In other embodiments, the spoiler ring 15 can also be fixed on the inner wall of the heat exchange tube. Thus, when the fluid passes through, the spoiler ring 15 turbulates the water and steam in the fluid, interferes with the formation of the steam film, promotes the detachment of the steam bubbles, and improves the heat exchange effect and the rapid formation of steam.

[0044] In other feasible embodiments, the spoiler structure is not limited to the structure of the above-mentioned spiral fins 3. For example, the spoiler structure includes spoiler protrusions protruding radially on the outer wall of the inner rod 2 or the inner wall of the outer tube body 1. The spoiler protrusions can be spoiler blocks or spoiler plates. The spoiler blocks or spoiler plates are welded to the inner wall of the outer tube body 1 and are discretely distributed or spirally spaced or staggered up and down, or the spoiler blocks or spoiler plates are welded to the outer wall of the inner rod 2 and are discretely distributed or spirally spaced or staggered up and down.

[0045] An embodiment of the present application also provides a steam generating device, including the heat exchange tube described in any of the above.

[0046] It should be understood that the above description is for illustrative purposes and not for limitation. By reading the above description, many embodiments and many applications other than the provided examples will be obvious to those skilled in the art. Therefore, the scope of this teaching should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of the equivalents of these claims. For the sake of comprehensiveness, all articles and references, including patent applications and publications of announcements, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the inventor did not consider such subject matter as part of the disclosed utility model subject matter.

Claims

1. A heat exchange tube for steam generating equipment, characterized in that: include: outer tube body; A flow-disturbing structure is disposed inside the outer tube body, and the flow-disturbing structure is located below 80% of the height of the outer tube body.

2. The heat exchange tube according to claim 1, characterized in that: Also includes: The gas-liquid separation structure is arranged in the outer tube body; the flow disturbance structure is located below the gas-liquid separation structure.

3. The heat exchange tube according to claim 2, characterized in that: The gas-liquid separation structure is located at the upper end of the outer tube body.

4. The heat exchange tube according to claim 1, characterized in that: The flow-disturbing structure includes a spiral sheet extending spirally along the axial direction of the outer tube body.

5. The heat exchange tube according to claim 4, characterized in that: The distribution length of the spiral sheets in the axial direction is greater than 0.1 times the length of the outer tube body.

6. The heat exchange tube according to claim 4, characterized in that: The outer diameter of the spiral sheet is smaller than or equal to the inner diameter of the outer tube.

7. The heat exchange tube according to claim 5, characterized in that: The axial projection of the spiral sheet is a solid circle or a circular ring structure.

8. The heat exchange tube according to claim 4, characterized in that: The pitch of the spiral sheet is 5mm-30mm.

9. The heat exchange tube according to claim 4, characterized in that: The difference between the outer diameter of the spiral sheet and the inner diameter of the outer tube body is between 0 and 10 mm.

10. The heat exchange tube according to claim 4, characterized in that: A spoiler ring is sleeved outside the spiral sheet; the spoiler ring is sleeved between the inner wall of the outer tube body and the spiral sheet.

11. The heat exchange tube according to claim 10, characterized in that: The spoiler ring can be movably sleeved between the inner wall of the outer tube body and the spiral sheet.

12. The heat exchange tube according to claim 10, characterized in that: The cross section of the spoiler ring is circular, and the diameter of the ring wire of the spoiler ring is 0.1-2mm.

13. The heat exchange tube according to claim 4, characterized in that: An inner rod is provided in the outer tube body; a water storage space is formed between the outer wall of the inner rod and the inner wall of the outer tube body; the inner rod is more than 20% of the length of the outer tube body; the spiral sheet is fixedly connected to the outer wall of the inner rod and spirally extends on the outer wall of the inner rod.

14. The heat exchange tube according to claim 13, characterized in that: The spiral sheet continuously and spirally extends on the outer wall of the inner rod with a length of more than 0.3 times.

15. The heat exchange tube according to claim 13, characterized in that: The inner rod comprises a spoiler section provided with the spiral blade and a light wall section not provided with the spiral blade; the light wall section is located below the spoiler section.

16. The heat exchange tube according to claim 13, characterized in that: The flow-disturbing structure comprises a flow-disturbing protrusion which is arranged on the outer wall of the inner rod or the inner wall of the outer tube and protrudes in the radial direction.

17. A steam generating device, characterized in that: Comprising the heat exchange tube as claimed in any one of claims 1 to 16.

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