Heat exchange assembly, heat exchange equipment and steam generation system

Abstract

The utility model relates to a heat exchange assembly, heat exchange equipment and a steam generation system, the heat exchange assembly comprises an inner tube, a heat exchange structure and an outer tube, and a tube pass working medium channel is formed in the inner tube; the multiple heat exchange structures are sequentially arranged in the circumferential direction of the inner pipe, and a first preset distance is formed between every two adjacent heat exchange structures; every two adjacent heat exchange structures are connected with the outer wall of the inner pipe to form a first shell pass working medium channel; the outer pipe is arranged outside the inner pipe and the heat exchange structure in a sleeving mode, and a plurality of first hollowed-out parts are formed in the pipe wall of the outer pipe. According to the heat exchange assembly, a relatively closed evaporation space can be formed outside the inner pipe and the heat exchange structure of the heat exchange assembly through the outer pipe, bubbles generated in the outer pipe can be blocked by the pipe wall of the outer pipe, and therefore the bubbles move between the inner pipe and the outer pipe and flow out of the first hollow part of the outer pipe at a high flow speed, and the heat exchange efficiency is improved. In the heat exchange process, dirt is washed and removed, the accumulation amount of the dirt on the heat exchange assembly can be reduced, and the heat exchange capacity of the heat exchange assembly is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchange component, heat exchange equipment and a steam generation system. Background Art

[0002] In the prior art, the heat exchange area of ​​the heat exchange tube is often increased by adding heat exchange fins to the heat exchange tube. However, while increasing the heat exchange area through this structure, it also makes the structure of the heat exchange tube complicated. When water is used as the shell-side working fluid, since the water contains calcium, magnesium ions and other impurities, it is easy to form dirt on the surface of the heat exchange tube and the heat exchange fin. After the water generates bubbles on the outer wall of the heat exchange tube or the heat exchange structure, the bubbles directly leave the surface of the heat exchange tube and the heat exchange structure under the action of buoyancy, and cannot disturb or impact the dirt to make the dirt fall off. After the heat exchange tube has been working for a period of time, if a large amount of dirt accumulates, it is easy to cause the heat exchange capacity of the heat exchange tube to decrease, and in severe cases, it may even corrode the tube.

[0003] In order to solve this problem, the existing technology can only frequently use cleaning liquid to soak the heat exchange tubes to dissolve the dirt, thereby reducing the accumulation of dirt on the heat exchange tubes and heat exchange fins. However, since it is impossible to reduce the accumulation of dirt from the source (that is, reduce the accumulation of dirt during the heat exchange process), there are problems such as high cleaning frequency, long time required for soaking and dissolving dirt, and affecting production efficiency. Utility Model Content

[0004] The present application provides a heat exchange component, heat exchange equipment and steam generation system to solve the technical problem that dirt accumulates on heat exchange tubes and heat exchange fins during the heat exchange process, resulting in a decrease in the heat exchange capacity of the heat exchange tubes.

[0005] In a first aspect, the present application provides a heat exchange component, comprising:

[0006] An inner tube, wherein the inner tube has a tube-pass working medium passage;

[0007] Heat exchange structure, multiple heat exchange structures are arranged in sequence along the circumference of the inner tube, and there is a first preset distance between two adjacent heat exchange structures; the two adjacent heat exchange structures are connected to the outer wall of the inner tube to form a first shell-side working medium channel;

[0008] The outer tube is sleeved on the outside of the inner tube and the heat exchange structure, and a plurality of first hollow parts are opened on the tube wall of the outer tube.

[0009] Optionally, the cross-section of the heat exchange structure is a semi-closed structure, the opening of the semi-closed structure is arranged opposite to the outer wall of the inner tube, the semi-closed structure and the outer wall of the inner tube are combined to form a second shell-side working fluid channel, and the heat exchange structure has a second hollow portion connected to the second shell-side working fluid channel.

[0010] Optionally, the semi-enclosed structure is a V-shaped structure, a C-shaped structure or a U-shaped structure.

[0011] Optionally, a plurality of second hollow portions are provided on one or both sides along the length direction of the heat exchange structure, and at least a portion of the outer wall of the inner tube is configured as a side wall of the second hollow portion;

[0012] Along the length direction of the heat exchange structure, the heat exchange structure has a plurality of third hollow parts arranged opposite to the outer wall of the inner tube.

[0013] Optionally, the plurality of first hollow portions are evenly distributed on the tube wall of the outer tube;

[0014] Along the axial direction of the outer tube, there is a second preset distance L2 between two adjacent first hollow portions, and the second preset distance L2 satisfies: 1.2D1≤L2≤3D1, where D1 is the axial dimension of a single first hollow portion in the outer tube;

[0015] Along the circumference of the outer tube, the ratio of the total size of the plurality of first hollow portions in the circumference of the outer tube to the circumference of the outer tube is in the range of 0.1-0.6.

[0016] Optionally, the heat exchange component further includes a connector, which is connected between the inner tube and the outer tube, and two ends of the inner tube extend out of two ends of the outer tube.

[0017] Optionally, the ratio of the length of the outer tube to the length of the inner tube is in the range of 0.6-0.96.

[0018] In a second aspect, the present application provides a heat exchange device, including the heat exchange component provided in the first aspect of the present application, and also including a shell, multiple heat exchange components are arranged inside the shell, and the bottom of the shell has a circulation part.

[0019] Optionally, the heat exchange device further comprises a liquid blocking structure, which is arranged opposite to the circulation part and is located between the bottom heat exchange component and the circulation part.

[0020] Optionally, the heat exchange equipment also includes a first sealed chamber and a second sealed chamber, which are respectively arranged at the two ends of the shell, and the two ends of the inner tube are respectively connected to the first sealed chamber and the second sealed chamber, so as to realize the flow of the tube-side working fluid between the first sealed chamber, the inner tube and the second sealed chamber.

[0021] Optionally, the first sealed chamber has a tube-side working fluid inlet, and the second sealed chamber has a tube-side working fluid outlet; the tube-side working fluid outlet is arranged at the bottom of the second sealed chamber, and the bottom of the inner cavity of the second sealed chamber has a groove, and the bottom surface of the groove is connected to the tube-side working fluid outlet.

[0022] In a third aspect, the present application provides a steam generating system, comprising the heat exchange device provided in the second aspect of the present application, wherein a steam outlet is provided on the shell.

[0023] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0024] The heat exchange component provided in the embodiment of the present application can form a relatively closed evaporation space outside the inner tube and the heat exchange structure of the heat exchange component through the outer tube, so that the bubbles generated in the first shell-side working medium channel can be blocked by the tube wall of the outer tube, thereby allowing the bubbles to move between the inner tube and the outer tube. The outer wall of the inner tube, the surface of the heat exchange structure and the inner wall of the outer tube are flushed through the movement of the bubbles, thereby preventing dirt from accumulating on the outer wall of the inner tube, the surface of the heat exchange structure and the inner wall of the outer tube, and flowing out from the first hollow portion of the outer tube at a higher flow rate, which can bring out the flushed dirt together, thereby realizing the flushing and removal of dirt during the heat exchange process, which is beneficial to reducing the amount of dirt accumulated on the heat exchange component and ensuring the heat exchange capacity of the heat exchange component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 A schematic diagram of the structure of a heat exchange assembly provided in an embodiment of the present application;

[0029] Figure 2 Provided in the embodiments of this application Figure 1 A magnified view of the details of part A;

[0030] Figure 3 A cross-sectional view of a heat exchange assembly provided in an embodiment of the present application (connectors are not shown);

[0031] Figure 4 A partial front view of a heat exchange assembly provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the connection between the inner tube and the heat exchange structure provided in an embodiment of the present application;

[0033] Figure 6 Provided in the embodiments of this application Figure 5A magnified view of the details of part B;

[0034] Figure 7 A schematic diagram of an inner tube and a heat exchange structure provided in an embodiment of the present application unfolded along the circumference of the inner tube;

[0035] Figure 8 Provided in the embodiments of this application Figure 7 A top view of

[0036] Fig. 9 Provided in the embodiments of this application Figure 8 A front view of

[0037] Fig.10 Provided in the embodiments of this application Figure 8 Side view of

[0038] Fig.11 A side view of a heat exchange assembly provided in an embodiment of the present application (heat exchange structure is not shown);

[0039] Fig.12 A schematic diagram of the structure of a heat exchange device provided in an embodiment of the present application;

[0040] Fig.13 A cross-sectional view of a heat exchange device provided in an embodiment of the present application;

[0041] Fig.14 A schematic diagram of a partial structure of a second sealing chamber provided in an embodiment of the present application;

[0042] Fig.15 Provided in the embodiments of this application Fig.13 A detailed enlarged view of part C in the middle.

[0043] Description of reference numerals:

[0044] 1. Inner tube;

[0045] 2. heat exchange structure; 210. second hollow portion; 220. third hollow portion; 230. heat exchange body;

[0046] 3. outer tube; 310. first hollow portion; 320. tube wall;

[0047] 4. Connectors;

[0048] 5. Shell; 510. Circulation portion; 520. Steam outlet;

[0049] 6. Liquid blocking structure;

[0050] 7. The first sealing chamber; 710. The working medium inlet of the pipe process;

[0051] 8. Second sealing chamber; 810. Pipeline working medium outlet; 820. Groove;

[0052] 9. Tube sheet;

[0053] 10. Flange. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0055] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0056] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0057] In order to solve the technical problem in the prior art that dirt accumulates on heat exchange tubes and heat exchange fins during the heat exchange process, resulting in a decrease in the heat exchange capacity of the heat exchange tubes, the present application provides a heat exchange component, a heat exchange equipment and a steam generation system, which can form a relatively closed evaporation space outside the inner tube 1 and the heat exchange structure 2 of the heat exchange component through the outer tube 3, so that the bubbles generated in the first shell-side working medium channel can be blocked by the tube wall 320 of the outer tube 3, so that the bubbles move between the inner tube 1 and the outer tube 3, and the outer wall of the inner tube 1, the surface of the heat exchange structure 2 and the inner wall of the outer tube 3 are flushed through the movement of the bubbles, so as to avoid the accumulation of dirt on the outer wall of the inner tube 1, the surface of the heat exchange structure 2 and the inner wall of the outer tube 3, and flow out from the first hollow portion 310 of the outer tube 3 at a higher flow rate, so that the flushed dirt can be taken out together, and the dirt can be flushed and removed during the heat exchange process, which is beneficial to reduce the amount of dirt accumulated on the heat exchange component and to ensure the heat exchange capacity of the heat exchange component.

[0058] See also Figures 1 to 15 In a first aspect, an embodiment of the present application provides a heat exchange assembly, including an inner tube 1, a heat exchange structure 2 and an outer tube 3, such as Figures 1 to 3 The inner tube 1 has a tube-side working medium channel inside, which can be used to pass high-temperature tube-side working medium to exchange heat with the shell-side working medium outside the heat exchange component, thereby increasing the temperature of the shell-side working medium and achieving heat exchange.

[0059] In the following embodiments of the present application, water is used as the shell-side working medium, and after heat exchange with the high-temperature tube-side working medium, evaporation heat exchange can be performed inside the shell 5 of the heat exchange device. The tube-side working medium can be any high-temperature heat transfer medium that can achieve the purpose of the present application, and is not limited here.

[0060] Multiple heat exchange structures 2 are arranged in sequence along the circumference of the inner tube 1, which can be used to increase the heat exchange area of ​​the heat exchange component, improve the heat exchange efficiency of the heat exchange component, facilitate rapid heat transfer to the shell-side working fluid, and increase the steam generation rate when water is used as the shell-side working fluid.

[0061] There is a first preset distance L1 between two adjacent heat exchange structures 2, and the two adjacent heat exchange structures 2 are connected to the outer wall of the inner tube 1 to form a first shell-side working medium channel, such as Figure 6 , Figure 8 and Fig. 9 As shown. Since the temperature of the outer wall of the inner tube 1 is relatively high, the shell-side working fluid can directly generate bubbles on the outer wall of the inner tube 1 in the first shell-side working fluid channel. With the bubbles as the gasification core, the bubbles gradually grow and break away from the outer wall of the inner tube 1 under the heating of the surrounding hot fluid, which can strengthen the fluid disturbance in the first shell-side working fluid channel, so that the evaporation process continues.

[0062] The outer tube 3 is sleeved on the outside of the inner tube 1 and the heat exchange structure 2, and can form a barrier for bubbles that escape from the first shell-side working medium channel. The outer tube 3 has a third shell-side working medium channel connected to the first shell-side working medium channel. The bubbles move between the first shell-side working medium channel and the third shell-side working medium channel. During the movement, the outer wall of the inner tube 1, the surface of the heat exchange structure 2, and the inner wall of the outer tube 3 can be flushed, which can prevent dirt from accumulating on the outer wall of the inner tube 1, the surface of the heat exchange structure 2, and the inner wall of the outer tube 3.

[0063] A plurality of first hollow portions 310 are provided on the tube wall 320 of the outer tube 3. The bubbles move along the inner wall of the outer tube 3 and eventually leave the heat exchange component through the first hollow portions 310. Since the steam flow rate of the bubbles at the first hollow portions 310 is relatively large, the dirt can be brought out of the heat exchange component, thereby reducing the dirt deposition inside the heat exchange component and avoiding adverse effects on the heat exchange capacity of the heat exchange component.

[0064] It should be noted that, in the present application, by sleeved the outer tube 3 having the first hollow portion 310 on the outside of the inner tube 1 and the heat exchange structure 2, a relatively closed evaporation space can be formed outside the inner tube 1 and the heat exchange structure 2, which is beneficial to blocking the bubbles, allowing the bubbles to move between the inner tube 1 and the outer tube 3, and disturbing the shell-side working fluid between the inner tube 1 and the outer tube 3, which is beneficial to improving the heat exchange efficiency of the heat exchange component while flushing the dirt.

[0065] It should be noted that the first preset distance L1 between two adjacent heat exchange structures 2 can be designed according to the processing capacity and the density requirements of the heat exchange structure 2. The spacing between the two adjacent heat exchange structures 2 needs to be moderate to facilitate manufacturing so that the heat exchange component has a larger heat exchange area and stronger heat exchange capacity. No limitation is made here.

[0066] In the above embodiments, the heat exchange structure 2 can be a needle-shaped structure, a sheet-shaped structure or the like. However, when a needle-shaped structure or a sheet-shaped structure is adopted, a large amount of heat on the outer wall of the inner tube 1 is easily dissipated from between two adjacent needle-shaped structures or sheet-shaped structures. A large amount of heat cannot be transferred to the heat exchange structure 2 for heat exchange, which is not conducive to extending the heat exchange contact time between the heat exchange component and the external shell-side working fluid, and the heat exchange efficiency is low.

[0067] In some preferred embodiments of this application, please refer to Figure 3 , Figure 5 and Figure 6The cross section of the heat exchange structure 2 is a semi-enclosed structure. The opening of the semi-enclosed structure is arranged opposite to the outer wall of the inner tube 1. The semi-enclosed structure and the outer wall of the inner tube 1 enclose a second shell-side working medium channel. The semi-enclosed structure can block part of the heat dissipation, thereby preventing the heat from being dissipated quickly. After the shell-side working medium enters the second shell-side working medium channel, it can fully exchange heat with the outer wall of the inner tube 1 and the inner wall of the heat exchange structure 2. At the same time, the shell-side working medium outside the heat exchange structure 2 can also exchange heat with the outer wall of the inner tube 1 and the outer wall of the heat exchange structure 2, which is conducive to increasing the heat exchange area and heat exchange efficiency of the heat exchange component.

[0068] The heat exchange structure 2 has a second hollow portion 210 connected to the second shell-side working fluid channel. Bubbles generated in the second shell-side working fluid channel can overflow from the second hollow portion 210 to avoid excessive air pressure inside the second shell-side working fluid channel, which affects the connection reliability between the heat exchange structure 2 and the inner tube 1.

[0069] It should be noted that compared with the heat exchange tubes in the prior art, the heat exchange structure 2 of the present application is a semi-closed structure, which is equivalent to adding a connecting plate body on the top of two adjacent fins. Compared with the prior art, not only the heat exchange area of ​​the heat exchange structure 2 is greatly increased, but also a relatively closed second shell-side working fluid channel is formed by the semi-closed heat exchange structure 2 and the outer wall of the inner tube 1, which can intercept the heat dissipated to the outside by the inner tube 1, and avoid a large amount of heat from being dissipated from the open gaps between adjacent fins, which is beneficial to improving energy utilization efficiency and heat exchange efficiency.

[0070] In some preferred embodiments of this application, please refer to Figure 3 and Figure 6 The semi-enclosed structure can be a V-shaped structure, a C-shaped structure or a U-shaped structure, all of which can intercept the heat dissipated from the outer wall of the inner tube 1. As a specific embodiment of the present application, the cross-section of the heat exchange body 230 in the heat exchange structure 2 is as follows Figure 3 and Figure 6 In the inverted U-shaped structure shown, the cross-section of the second shell-side working medium channel formed by the heat exchange structure 2 and the outer wall of the inner tube 1 is rectangular.

[0071] It should be noted that when the water working fluid (i.e., the shell-side working fluid) evaporates outside the tube, the heated wall surface needs to have a certain degree of superheat compared to the fluid saturation temperature in order for the fluid to cross the energy barrier and produce a vaporization core. Since water is a working fluid with a large surface energy, its energy barrier will be more difficult to cross, which leads to an increase in the superheat requirement of water for initial boiling. The first shell-side working fluid channel and the second shell-side working fluid channel in the present application are alternately arranged in the circumference of the inner tube 1, and the heat exchange area can be increased and the heat exchange effect of the heat exchange component can be enhanced by alternating the semi-closed structure and the open structure. The temperature of the outer wall of the inner tube 1 in the first shell-side working fluid channel and the second shell-side working fluid channel can meet the superheat requirement during boiling, so as to generate bubbles on the outer wall of the inner tube 1, form a vaporization core, and improve the heat exchange efficiency through boiling heat exchange.

[0072] In some embodiments of this application, please refer to Figure 6 and Figure 7 A plurality of second hollow portions 210 are provided on one or both sides along the length direction of the heat exchange structure 2, and at least a portion of the outer wall of the inner tube 1 is configured as the side wall of the second hollow portion 210. When bubbles are generated on the outer wall of the inner tube 1 in the second shell-side working fluid channel, they can directly overflow from the second hollow portion 210, thereby avoiding excessive accumulation of bubbles inside the second shell-side working fluid channel and causing a rapid increase in pressure, which is not conducive to ensuring the reliability of the connection between the heat exchange structure 2 and the inner tube 1.

[0073] As a specific embodiment of the present application, a plurality of second hollow portions 210 are provided on both sides along the length of the heat exchange structure 2 , so as to realize the circumferential flow of the shell-side working fluid and bubbles along the inner tube 1 .

[0074] Along the length direction of the heat exchange structure 2 , the heat exchange structure 2 has a plurality of third hollow portions 220 arranged opposite to the outer wall of the inner tube 1 , so that the bubbles inside the second shell-side working medium channel can also flow out from the third hollow portions 220 .

[0075] It should be noted that when the bubbles inside the second shell-side working fluid channel flow out from the second hollow portion 210, the two inner walls of the heat exchange structure 2 can be flushed; when the bubbles inside the second shell-side working fluid channel flow out from the third hollow portion 220, the top inner wall of the heat exchange structure 2 can be flushed, thereby avoiding a large amount of dirt accumulation inside the heat exchange structure 2 and affecting the heat exchange capacity of the heat exchange structure 2.

[0076] It should be noted that the second hollow portion 210 and the third hollow portion 220 may be in the shape of a circle or a polygon (the number of sides of the polygon is an integer greater than 3). As a specific embodiment of the present application, the second hollow portion 210 is a rectangular hole, which is disposed on both sides of the heat exchange body 230; the third hollow portion 220 is a circular hole, which is disposed on the top of the heat exchange body 230, such as Figure 6 and Figure 7 shown.

[0077] In some embodiments of this application, please refer to Figure 8 and Fig. 9 , the diameter of the third hollow part 220 is defined as D3, the center distance between two adjacent third hollow parts 220 is defined as L3, and the distance between the two inner side walls of the heat exchange body 230 is defined as L4. Among them, the value range of L4 is preferably 0.4mm-1.0mm. This is because when the distance between the two inner side walls of the heat exchange body 230 is less than 0.4mm, the heat exchange area at the bottom of the second shell-side working medium channel (i.e., on the outer wall of the inner tube 1) will be insufficient, which is not conducive to the direct generation of bubbles on the outer wall of the inner tube 1, and the heat exchange effect is poor; when the distance between the two inner side walls of the heat exchange body 230 is greater than 1.0mm, the side wall of the heat exchange body 230 (equivalent to the heat exchange fins) in the circumferential direction of the inner tube 1 will be low in density, and the heat exchange area will be insufficient, resulting in poor heat exchange effect of the inner tube 1 and the heat exchange structure 2 as a whole. Preferably, when the outer diameter D4 of the inner tube 1 is 19.05 mm, the value of L4 is 0.75 mm, which is conducive to directly generating bubbles on the outer wall of the inner tube 1, ensuring that the heat exchange tube has sufficient enhanced heat exchange area and improving the heat exchange effect.

[0078] The value of D3 satisfies 0.2L4≤D3≤0.8L4. This is because, when the diameter of the third hollow portion 220 is less than 0.2L4, the bubbles generated by evaporation heat exchange encounter greater resistance when overflowing from the third hollow portion 220, and are prone to burst prematurely, resulting in poor heat exchange effect; and when the diameter of the third hollow portion 220 is greater than 0.8L4, the top of the heat exchange structure 2 is relatively open, and it is not easy to generate bubbles inside the second shell-side working fluid channel, which also leads to poor heat exchange effect.

[0079] The value of L3 satisfies 1.5D3≤L3≤6D3. This is because, when the center distance between two adjacent third hollow parts 220 is less than 1.5D3, the density of the third hollow parts 220 at the top of the heat exchange body 230 is relatively large, resulting in a large number of third hollow parts 220, making the top of the heat exchange body 230 too open, which will cause the pressure inside the second shell-side working medium channel to be released too quickly, which is not conducive to the evaporation of the shell-side working medium, resulting in poor heat exchange effect. When the center distance between two adjacent third hollow parts 220 is greater than 6D3, there are too few paths for the boiled gaseous shell-side working medium to overflow from the heat exchange structure 2, and the overflow resistance is too large, which will cause the bubbles generated by boiling to rupture prematurely, resulting in poor heat exchange effect.

[0080] In some embodiments of this application, please refer to Fig. 9, the wall thickness of the heat exchange body 230 in the heat exchange structure 2 is defined as W1, and the height of the heat exchange structure 2 is defined as H1. Among them, the value range of W1 is preferably 0.05mm-0.35mm. This is because when the wall thickness of the heat exchange body 230 is less than 0.05mm, the structure of the heat exchange body 230 is too fragile and easy to be damaged; and when the wall thickness of the heat exchange body 230 is greater than 0.35mm, the heat exchange body 230 will be too thick, not only the heat transfer resistance is too large, but also the bottom area of ​​the evaporation cavity (i.e., the bottom area of ​​the second shell-side working fluid channel) will be indirectly reduced. Since the bottom of the evaporation cavity is located on the outer wall of the inner tube 1, the heat exchange capacity of this part is relatively strong. If the bottom area is reduced, the evaporation heat exchange intensity of the shell-side working fluid inside the second shell-side working fluid channel will be reduced.

[0081] The value range of H1 is preferably 0.3mm-1.2mm. This is because when the height of the heat exchange structure 2 is less than 0.3mm, the enhanced heat exchange area of ​​the heat exchange structure 2 will be insufficient; and when the height of the heat exchange structure 2 is greater than 1.2mm, the height of the heat exchange structure 2 will be too high, and the time for the bubbles to move from the outer wall of the inner tube 1 to the third hollow portion 220 will be too long. There is a high possibility of being disturbed by the shell-side working fluid inside the second shell-side working fluid channel, which will cause the bubbles to rupture prematurely and reduce the heat exchange effect.

[0082] As a specific embodiment of the present application, when the outer diameter D4 of the inner tube 1 is 19.05 mm, the value of W1 is preferably 0.2 mm, and the value of H1 is preferably 0.6 mm, which is beneficial to ensure the structural strength and heat exchange effect of the heat exchange structure 2.

[0083] In some embodiments of this application, please refer to Fig.10 , the length of the second hollow portion 210 is defined as L5, the layout distance between two adjacent second hollow portions 210 is defined as L6, and the height of the second hollow portion 210 is defined as H2. Among them, the value range of L5 is preferably 0.2mm-0.8mm. This is because when the length of the second hollow portion 210 is less than 0.2mm, when the shell-side working fluid and bubbles flow along the circumference of the inner tube 1, the flow rate is small, and the flushing effect on the inner tube 1 and the heat exchange structure 2 is poor. When the length of the second hollow portion 210 is greater than 0.8mm, it is not conducive to the bubbles generated on the outer wall of the inner tube 1 to quickly overflow to the third hollow portion 220, which will weaken the evaporation heat exchange effect of the shell-side working fluid.

[0084] The value range of H2 is preferably 1.1L5≤H2≤1.5L5, because when the height of the second hollow portion 210 is less than 1.1L5, the size of the second hollow portion 210 is small, and when the shell-side working fluid and bubbles flow along the circumference of the inner tube 1, the flow rate is small, and the flushing effect on the inner tube 1 and the heat exchange structure 2 is poor. When the height of the second hollow portion 210 is greater than 1.5L5, it is not conducive to the bubbles generated on the outer wall of the inner tube 1 to quickly overflow to the third hollow portion 220, which will weaken the evaporation heat exchange effect of the shell-side working fluid.

[0085] The value range of L6 is preferably 2.2L5≤L6≤10L5. This is because, when the distance between two adjacent second hollow portions 210 in the axial direction of the inner tube 1 is less than 2.2L5, it means that there are too many rectangular holes at the bottom of the heat exchange structure 2, which is not conducive to the bubbles formed on the outer wall of the inner tube 1 to move upward quickly and overflow from the third hollow portion 220, which will weaken the evaporation heat exchange effect of the shell-side working fluid; when the distance between two adjacent second hollow portions 210 in the axial direction of the inner tube 1 is greater than 10L5, it means that there are too few rectangular holes on both sides of the heat exchange structure 2, which is not conducive to the circumferential flow of the shell-side working fluid and bubbles in the inner tube 1 during heat exchange, resulting in a small circumferential flow of the shell-side working fluid and bubbles, and a poor flushing effect on dirt.

[0086] In the above embodiment, the shape and number of the first hollow portion 310 can be arranged according to the steam flow rate required to flush the dirt. Figure 1 and Figure 2 A plurality of first hollow portions 310 are evenly distributed on the tube wall 320 of the outer tube 3 , and the shape of the first hollow portions 310 can also be circular or polygonal.

[0087] In some embodiments of this application, please refer to Figure 4, along the axial direction of the outer tube 3, there is a second preset distance L2 between two adjacent first hollow parts 310. When the second preset distance L2 is the center distance between the two first hollow parts 310, the second preset distance L2 satisfies: 1.2D1≤L2≤3D1, where D1 is the axial dimension of a single first hollow part 310 in the outer tube 3. This is because when the center distance between the two first hollow parts 310 is less than 1.2D1, the opening density in the axial direction of the outer tube 3 is relatively large, resulting in an excessively large axial opening area of ​​the outer tube 3, a relatively low internal air pressure in the third shell-side working medium channel, and a relatively low steam flow rate generated by evaporation in the third shell-side working medium channel. The incidental impact effect on the dirt solidified on the heat exchange structure 2, the outer wall of the inner tube 1, and the inner wall of the outer tube 3 during operation is insufficient, which is not conducive to reducing the dirt accumulated on the heat exchange components during the heat exchange process. When the center distance between the two first hollow portions 310 is greater than 3D1, the axial opening density of the outer tube 3 is small, resulting in the outer tube 3 having a too small axial opening area, a large air pressure inside the third shell-side working fluid channel, and a large steam flow rate generated by evaporation, which will have a large impact on the outer tube 3 and the heat exchange component, causing adverse vibrations in the heat exchange component.

[0088] Along the circumference of the outer tube 3, the ratio of the total size of the plurality of first hollow portions 310 in the circumference of the outer tube 3 to the circumference of the outer tube 3 (πD2, where D2 is the diameter of the outer tube 3) is in the range of 0.1-0.6. This is because, when the ratio is less than 0.1, the opening length of the first hollow portions 310 in the circumference of the outer tube 3 accounts for too small a range of the circumference of the outer tube 3, which will result in too small an opening area in the circumference of the outer tube 3, and too large a flow rate of the steam generated by evaporation, which will have a large impact on the outer tube 3 and the heat exchange component, causing the heat exchange component to vibrate undesirably. When the ratio is greater than 0.6, the opening length of the first hollow portions 310 in the circumference of the outer tube 3 accounts for too large an opening area in the circumference of the outer tube 3, and too small a flow rate of the steam generated by evaporation, which will have insufficient impact on the dirt solidified on the heat exchange structure 2, the outer wall of the inner tube 1 and the inner wall of the outer tube 3 during operation, which is not conducive to reducing the dirt accumulated on the heat exchange component during the heat exchange process.

[0089] As a specific embodiment of the present application, the first hollow portion 310 is a circular hole, and the dimensions of the first hollow portion 310 in the axial direction of the outer tube 3 and in the circumferential direction of the outer tube 3 are both D1, and D1 is the diameter of the first hollow portion 310. Preferably, in the circumferential direction of the outer tube 3, the number of openings of the first hollow portion 310 in a single circle is 3-10.

[0090] In some embodiments of this application, please refer to Fig.11The heat exchange assembly also includes a connector 4, which is connected between the inner tube 1 and the outer tube 3 and can be used to achieve a fixed connection between the outer tube 3 and the inner tube 1. In some preferred embodiments of the present application, the inner tube 1 and the outer tube 3 are concentrically arranged, and a plurality of connectors 4 are distributed in a divergent manner along the circumference of the inner tube 1, so that a third shell-side working medium channel with a uniform gap can be formed between the inner tube 1 and the outer tube 3, so that the bubbles generated on the outer wall of the inner tube 1 can flow out uniformly along the circumference of the outer tube 3. There is a gap between two adjacent connectors 4 to avoid blocking the third shell-side working medium channel, such as Fig.11 shown.

[0091] It should be noted that the connecting piece 4 is at least arranged at both ends of the outer tube 3, and is used to make the gap of the third shell-side working fluid channel between the inner tube 1 and the outer tube 3 uniform, which is beneficial to the uniform heat exchange of the shell-side working fluid along the circumference of the inner tube 1, and is beneficial to the uniform flow and flushing of the shell-side working fluid bubbles along the circumference of the inner tube 1.

[0092] The two ends of the inner tube 1 extend out of the two ends of the outer tube 3 so as to be connected with the tube sheets 9 at the two ends of the heat exchange device, thereby fixing the heat exchange component.

[0093] In some embodiments of this application, please refer to Figure 4 , the distance that the end of the inner tube 1 extends out of the outer tube 3 is defined as L7. In some preferred embodiments of the present application, L7 is 50mm-300mm. This is because when the distance that the end of the inner tube 1 extends out of the outer tube 3 is less than 50mm, it is not conducive to the fixation of the two ends of the inner tube 1. When the distance that the end of the inner tube 1 extends out of the outer tube 3 is greater than 300mm, the length of the efficient heat exchange section inside the outer tube 3 will be relatively small, which is not conducive to increasing the heat exchange area of ​​the heat exchange tube.

[0094] In some preferred embodiments of the present application, the ratio of the length of the outer tube 3 to the length of the inner tube 1 is in the range of 0.6-0.96. This is because, when the ratio of the length of the outer tube 3 to the length of the inner tube 1 is less than 0.6, the outer tube 3 occupies a smaller portion of the total length of the inner tube 1, which will also cause the opening section of the outer tube 3 with the first hollow portion 310 to occupy a smaller portion of the total length of the inner tube 1, resulting in a limited length of the inner tube 1 that can be flushed by steam flowing out of the first hollow portion 310 during the heat exchange process, which can easily cause dirt to accumulate in a local area of ​​the inner tube 1, reducing the heat exchange performance of the heat exchange assembly. When the ratio of the length of the outer tube 3 to the length of the inner tube 1 is greater than 0.96, the length of the inner tube 1 extending out of the outer tube 3 at both ends will be limited, which is not conducive to the assembly and fixation of the two ends of the inner tube 1.

[0095] See also Figures 1 to 15The second aspect of the embodiment of the present application provides a heat exchange device, including the heat exchange component in the above embodiment, and also includes a shell 5, multiple heat exchange components are arranged inside the shell 5, and the bottom of the shell 5 has a circulation part 510, which can be used to realize the input and output of the shell-side working fluid.

[0096] In the above embodiment, when the heat exchange component needs to be soaked and cleaned, the circulation part 510 can also be used to input and output the cleaning liquid. Since the heat exchange component of the present application can flush the outer wall of the inner tube 1, the surface of the heat exchange structure 2 and the inner wall of the outer tube 3 with high-speed steam during use, the accumulation of dirt in the heat exchange component is slight, thereby reducing the frequency of soaking and cleaning, reducing the time required for soaking and dissolving dirt, and helping to improve the cleaning efficiency of the heat exchange equipment, thereby reducing the impact of cleaning the heat exchange equipment on production efficiency.

[0097] In some embodiments of this application, please refer to Fig.12 and Fig.13 The heat exchange equipment also includes a liquid blocking structure 6, which is arranged opposite to the circulation part 510. The liquid blocking structure 6 is located between the bottom heat exchange component and the circulation part 510. When the shell-side working fluid or cleaning liquid is input into the shell 5, the liquid directly impacts the bottom heat exchange component, causing tube bundle impact and vibration.

[0098] It should be noted that the liquid blocking structure 6 can be a plate-shaped structure, a block-shaped structure, a box-shaped structure, etc., as long as it can form a barrier to the liquid passing through the circulation part 510, the purpose of the present application can be achieved. As a specific embodiment of the present application, the liquid blocking structure 6 is a plate-shaped structure, and both ends of the plate-shaped structure are connected to the inner wall of the shell 5, so that there is a distance between the bottom of the plate-shaped structure and the circulation part 510, so as to prevent the liquid blocking structure 6 from affecting the circulation part 510 from passing the shell-side working fluid or cleaning liquid into the shell 5.

[0099] In some embodiments of this application, please refer to Fig.12 and Fig.13 The heat exchange equipment also includes a first sealed chamber 7 and a second sealed chamber 8, which are respectively arranged at the two ends of the shell 5, and the two ends of the inner tube 1 are respectively connected to the first sealed chamber 7 and the second sealed chamber 8, so as to realize the flow of the tube-side working medium between the first sealed chamber 7, the inner tube 1 and the second sealed chamber 8, thereby realizing the single-flow, double-flow or multi-flow flow of the tube-side working medium inside the shell 5.

[0100] As a specific embodiment of the present application, the first sealed chamber 7 has a tube-side working fluid inlet 710, which can be used to transport high-temperature tube-side working fluid into the inner tube 1. The second sealed chamber 8 has a tube-side working fluid outlet 810, and the condensed tube-side working fluid output from the inner tube 1 can be discharged through the tube-side working fluid outlet 810, thereby realizing a single-flow flow of the tube-side working fluid in the shell 5.

[0101] In some embodiments of this application, please refer to Fig.13 , Fig.14 and Fig.15 The tube-side working fluid outlet 810 is arranged at the bottom of the second sealed chamber 8. The bottom of the inner cavity of the second sealed chamber 8 has a groove 820. The bottom surface of the groove 820 is connected to the tube-side working fluid outlet 810, so that the condensed tube-side working fluid in the second sealed chamber 8 can be completely discharged, reducing the residual amount of the tube-side working fluid in the second sealed chamber 8.

[0102] In some embodiments of the present application, the depth of the groove 820 is defined as H3, and the bottom wall thickness of the second sealing chamber 8 is defined as W2. In order to avoid the adverse effect of the groove 820 on the structural strength of the bottom of the second sealing chamber 8, the ratio of H3 to W2 is preferably 0.25-0.5. This is because, when the ratio is less than 0.25, the groove 820 is shallow, and the liquid pipe-side medium cannot form a good liquid seal at the bottom of the second sealing chamber 8, and it is impossible to ensure that the liquid pipe-side medium in the second sealing chamber 8 is completely discharged; when the ratio is greater than 0.5, the chamber wall thickness at the groove 820 is greatly reduced, which will affect the local structural strength of the second sealing chamber 8 at the groove 820.

[0103] In some embodiments of this application, please refer to Fig.12 and Fig.13 Tube sheets 9 are provided at both ends of the shell 5 , and a plurality of through holes for connecting the inner tube 1 are provided on the tube sheet 9 , so as to realize the fixed setting of the inner tube 1 .

[0104] In some embodiments of the present application, the heat exchange device further includes a flange 10, and the first sealing chamber 7 and the right tube sheet 9, and the second sealing chamber 8 and the left tube sheet 9 are connected via the flange 10. Fig.12 and Fig.13 shown.

[0105] In the above embodiment, since a large amount of steam is generated by boiling heat exchange of the shell-side working fluid during the heat exchange process, the steam generated during the heat exchange process can be used in steam turbine power generation, direct heating, industrial steam supply and other usage scenarios, thereby realizing the recovery and utilization of waste heat of the tube-side working fluid.

[0106] The third aspect of the embodiment of the present application provides a steam generation system, including the heat exchange device in the above embodiment, specifically, a steam outlet 520 is provided on the shell 5. When the shell-side working medium is liquid water, high-temperature steam can be generated by evaporation and heat exchange of the shell-side working medium, and the high-temperature steam can be output from the steam outlet 520 to provide a steam heat source for the steam generation system, thereby realizing the utilization of a large amount of industrial waste heat generated during the heat exchange process. The steam outlet 520 is provided at the top of the shell 5, and the steam gathered at the top of the shell 5 during the heat exchange process can be output to the outside of the shell 5.

[0107] See also Figures 1 to 15In some embodiments of the present application, the working process of the above heat exchange device is as follows:

[0108] Step 1: introducing liquid shell-side working medium (i.e., water) into the shell 5 through the circulation portion 510, so that the multiple heat exchange components are completely immersed in the shell-side working medium;

[0109] Step 2: introducing high-temperature gaseous tube-side working medium through the tube-side working medium inlet 710 of the first sealing chamber 7, and the tube-side working medium enters the tube-side working medium channel of the inner tube 1;

[0110] Step 3: The shell-side working fluid enters the first shell-side working fluid channel, the second shell-side working fluid channel and the third shell-side working fluid channel, and contacts and exchanges heat with the inner tube 1 and the heat exchange structure 2; the bubbles generated during the heat exchange process overflow from the outer wall of the inner tube 1, the second hollow part 210, the third hollow part 220 and the first hollow part 310 in turn, and generate disturbances and impacts on the outer wall of the inner tube 1, the surface of the heat exchange structure 2 and the inner wall of the outer tube 3, thereby preventing dirt from accumulating on the surface of the heat exchange component;

[0111] Step 4: After the steam is discharged, it gathers at the top of the shell 5. The steam outlet 520 at the top of the shell 5 can be opened and closed as needed to provide steam for the steam generating system.

[0112] Step 5: The working fluid in the inner tube 1 flows along Fig.13 It moves from right to left in the tube, condenses into liquid tube-side working fluid after sufficient heat exchange, flows into the second sealed chamber 8, and is discharged from the groove 820 of the second sealed chamber 8 and the tube-side working fluid outlet 810.

[0113] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0114] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0115] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A heat exchange component, characterized in that: include: An inner tube (1), wherein the inner tube (1) has a tube-side working medium passage; A heat exchange structure (2), wherein a plurality of the heat exchange structures (2) are sequentially arranged along the circumference of the inner tube (1), and a first preset distance is provided between two adjacent heat exchange structures (2); the two adjacent heat exchange structures (2) are connected to the outer wall of the inner tube (1) to form a first shell-side working medium channel; An outer tube (3), the outer tube (3) being sleeved on the outside of the inner tube (1) and the heat exchange structure (2), and a plurality of first hollow portions (310) being opened on a tube wall (320) of the outer tube (3).

2. The heat exchange assembly according to claim 1, characterized in that: The cross-section of the heat exchange structure (2) is a semi-enclosed structure, the opening of the semi-enclosed structure is arranged opposite to the outer wall of the inner tube (1), the semi-enclosed structure and the outer wall of the inner tube (1) are enclosed to form a second shell-side working fluid channel, and the heat exchange structure (2) has a second hollow portion (210) connected to the second shell-side working fluid channel.

3. The heat exchange assembly according to claim 2, characterized in that: The semi-enclosed structure is a V-shaped structure, a C-shaped structure or a U-shaped structure.

4. The heat exchange assembly according to claim 2, characterized in that: A plurality of second hollow portions (210) are provided on one or both sides along the length direction of the heat exchange structure (2), and at least a portion of the outer wall of the inner tube (1) is configured as a side wall of the second hollow portion (210); Along the length direction of the heat exchange structure (2), the heat exchange structure (2) has a plurality of third hollow portions (220) arranged opposite to the outer wall of the inner tube (1).

5. The heat exchange assembly according to any one of claims 1 to 4, characterized in that: A plurality of the first hollow portions (310) are evenly distributed on the tube wall (320) of the outer tube (3); Along the axial direction of the outer tube (3), there is a second preset distance L2 between two adjacent first hollow portions (310), and the second preset distance L2 satisfies: 1.2D1≤L2≤3D1, wherein D1 is the axial dimension of a single first hollow portion (310) in the outer tube (3); Along the circumference of the outer tube (3), the ratio of the total size of the plurality of first hollow portions (310) in the circumference of the outer tube (3) to the circumference of the outer tube (3) is in the range of 0.1-0.

6.

6. The heat exchange assembly according to any one of claims 1 to 4, characterized in that: The heat exchange component further comprises a connecting piece (4), wherein the connecting piece (4) is connected between the inner tube (1) and the outer tube (3), and the two ends of the inner tube (1) are arranged to extend out of the two ends of the outer tube (3).

7. The heat exchange assembly according to claim 6, characterized in that: The ratio of the length of the outer tube (3) to the length of the inner tube (1) is in the range of 0.6-0.

96.

8. A heat exchange device, characterized in that: It comprises the heat exchange component according to any one of claims 1 to 7, and also comprises a shell (5), a plurality of the heat exchange components are arranged inside the shell (5), and the bottom of the shell (5) has a circulation portion (510).

9. The heat exchange device according to claim 8, characterized in that: The heat exchange device further comprises a liquid blocking structure (6), wherein the liquid blocking structure (6) is arranged opposite to the circulation portion (510), and the liquid blocking structure (6) is located between the heat exchange component at the bottom layer and the circulation portion (510).

10. The heat exchange device according to claim 8 or 9, characterized in that: The heat exchange device further comprises a first sealed chamber (7) and a second sealed chamber (8), wherein the first sealed chamber (7) and the second sealed chamber (8) are respectively arranged at two ends of the shell (5), and the two ends of the inner tube (1) are respectively connected to the first sealed chamber (7) and the second sealed chamber (8), so as to realize the flow of the tube-side working fluid between the first sealed chamber (7), the inner tube (1) and the second sealed chamber (8).

11. The heat exchange device according to claim 10, characterized in that: The first sealed chamber (7) has a tube-side working fluid inlet (710), and the second sealed chamber (8) has a tube-side working fluid outlet (810); the tube-side working fluid outlet (810) is arranged at the bottom of the second sealed chamber (8), and the bottom of the inner cavity of the second sealed chamber (8) has a groove (820), and the bottom surface of the groove (820) is connected to the tube-side working fluid outlet (810).

12. A steam generation system, comprising the heat exchange device according to any one of claims 8 to 11, characterized in that: The shell (5) is provided with a steam outlet (520).

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