A discontinuous helical baffle heat exchanger and method for reducing leaked fluid

Abstract

The present invention discloses a discontinuous spiral baffle heat exchanger and method for reducing leaked fluid, belonging to the field of discontinuous spiral baffle heat exchangers. In the shell of this heat exchanger, several groups of successively connected baffle assemblies are arranged along the shell side direction. The baffle assembly is composed of multiple baffle units with the same structure. The baffle unit is composed of a sector baffle and a triangular baffle that are vertically connected. Between every two adjacent baffle units, the sector baffle of the previous baffle unit is vertically connected to the triangular baffle of the next baffle unit. Through the design of the discontinuous spiral baffle, a continuous spiral flow channel is formed in this heat exchanger, which can effectively reduce the possibility of leaked fluid and improve the heat transfer efficiency of the fluid at the same time. It avoids the triangular leakage area formed between the discontinuous spiral baffle plates, reduces the leakage flow rate of the shell side fluid, enables the fluid to flow completely in a spiral manner, fully exchanges heat with the heat exchange tubes, and improves the heat transfer efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of discontinuous helical baffle heat exchangers, and particularly relates to a discontinuous helical baffle heat exchanger and method for reducing leaked fluid. Background Art

[0002] The current economic development consumes a huge amount of energy. Energy security and environmental issues have always been highly concerned. Improving energy utilization efficiency and energy conservation and emission reduction have become the key to solving the problems. Among energy consumption, industry accounts for the largest share, exceeding 70% of the total energy consumption. Among them, the petroleum, chemical, metallurgical, electric power, and thermal power sectors are all major energy consumers, and these high-energy-consuming sectors have a large demand for heat exchangers. According to statistics, in modern industry, heat exchangers account for 30% of all equipment investments; in refineries, heat exchangers account for about 40% of equipment investments; in seawater desalination equipment, the proportion is even higher. To improve the energy efficiency and economic benefits in the industrial field, the research and development of highly efficient and energy-saving heat exchangers are essential.

[0003] The shell-and-tube heat exchanger is an important heat exchange device, which has the advantages of simple structure, reliable operation and easy maintenance. There are two kinds of fluids, hot and cold, in the shell-and-tube heat exchanger. One fluid flows inside the tubes, and the other fluid flows in the shell side. Heat exchange is carried out through the heat exchange tubes. Usually, baffles are arranged in the shell side. The baffles are used to support the tube bundle and form flow channels at the same time, so that the fluid flows forward along the baffles, thereby increasing the turbulence to achieve the purpose of enhancing heat transfer. The shell-side structure of the shell-and-tube heat exchanger is the key factor affecting the heat exchange effect of the heat exchanger. The traditional baffle support structure of the shell-and-tube heat exchanger uses single-segment bow-shaped baffles. This kind of heat exchanger has the disadvantages of low heat transfer efficiency, flow dead zones and easy fouling. Through the research on heat transfer enhancement in the shell side, it is found that the shell-side pressure drop can be reduced and the shell-side heat transfer coefficient can be increased by improving the structure of the baffles, thereby improving the heat exchange capacity of the heat exchanger. For example, double-segment bow-shaped baffles, baffle rods, helical baffles, perforated baffles, etc. Among them, helical baffles are divided into continuous helical baffles and discontinuous helical baffles. The flow channel formed by the continuous helical baffle is a complete helical flow channel, while the flow channel formed by the discontinuous helical baffle is incomplete, and the gap between the baffles will cause the existence of leaked fluid. The helical baffle structure has been widely concerned by the academic and engineering circles because of its good heat transfer performance, small flow dead zones and relatively low pressure drop. For example, Chinese Patent CN212658096U discloses a shell-and-tube heat exchanger with continuous helical baffles, which can improve heat transfer efficiency, prevent fouling and vibration. However, in practical applications, the structure of the continuous helical baffle is relatively complex, and the processing and installation are difficult, and the manufacturing cost is relatively high, which greatly limits its application in the actual production process. The processing and installation process of the discontinuous helical baffle is relatively simple, and the manufacturing cost is also relatively low. Moreover, in practical applications, it is also relatively convenient to replace the baffle plates. Therefore, the discontinuous helical baffle is commonly used in industry to replace the continuous helical baffle to form an approximate helical surface to make the fluid flow in a spiral manner. However, for the discontinuous helical baffle, a part of the fluid will leak from the triangular area formed between two adjacent baffles, resulting in that the fluid in the shell side cannot flow in a complete spiral manner, but flows straight forward from the leakage space. This part of the fluid does not exchange heat fully with the heat exchange tubes, affecting the heat transfer between the fluid in the heat exchange tubes and the fluid in the shell side and reducing the heat exchange efficiency.

[0004] It can be seen that in the existing shell-and-tube heat exchanger with discontinuous helical baffles, due to the existence of leakage space, part of the fluid does not exchange heat fully with the heat exchange tubes, affecting the heat transfer between the fluid in the heat exchange tubes and the fluid in the shell side and reducing the heat exchange efficiency. Summary of the Invention

[0005] In order to overcome the above technical deficiencies, the present invention provides a discontinuous helical baffle heat exchanger for reducing leaked fluid and its working method, which can solve the technical problem that in the existing discontinuous helical baffle heat exchanger, due to the existence of a leakage space, part of the fluid does not fully exchange heat with the heat exchange tubes, affecting the heat transfer between the fluid in the heat exchange tubes and the shell-side fluid and reducing the heat exchange efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical content:

[0007] A discontinuous helical baffle heat exchanger for reducing leaked fluid, comprising a heat exchanger body, wherein a plurality of groups of successively connected baffle assemblies are arranged in the shell of the heat exchanger body along the shell-side direction;

[0008] The baffle assembly includes a plurality of baffle units with the same structure;

[0009] The baffle unit includes a sector baffle and a triangular baffle, and the sector baffle is perpendicularly connected to the triangular baffle;

[0010] Between every two adjacent baffle units, the sector baffle of the previous baffle unit is perpendicularly connected to the triangular baffle of the next baffle unit;

[0011] All the baffle units are successively connected to form a continuous spiral flow channel for the working medium to pass through.

[0012] Further, the baffle assembly includes four baffle units with the same structure; wherein, the four sector baffles in the same baffle unit can be spliced into an ellipse or a circle.

[0013] Further, the sector baffle is in a quarter-circle shape; the triangular baffle is in an isosceles triangle shape; the radius of the sector baffle is equal to the waist length of the triangular baffle; the first straight side of the sector baffle is connected to the waist of the triangular baffle, and the second straight side is connected to the waist of the triangular baffle of the next baffle unit.

[0014] Further, every two adjacent triangular baffles are perpendicularly arranged; every two triangular baffles separated by one are parallelly arranged.

[0015] Further, the spiral angle between every two adjacent baffle units is 15° - 45°.

[0016] Further, the spiral angle between every two adjacent baffle units is 25°.

[0017] Further, the heat exchanger body further includes tube sheets arranged at both ends of the shell, and a plurality of heat exchange tubes are inserted into the tube sheets; a shell-side fluid inlet conduit and a shell-side fluid outlet conduit are arranged on the shell.

[0018] Furthermore, multiple said heat exchange tubes are arranged in a square pattern.

[0019] Furthermore, inclined tube holes are formed in the sector baffles, and the heat exchange tubes are arranged through the tube holes.

[0020] A working method of a discontinuous spiral baffle heat exchanger for reducing leakage fluid, based on the above discontinuous spiral baffle heat exchanger, includes:

[0021] The first fluid flows into one end of the shell, spirally flows along the continuous spiral flow path formed by the baffle plate units, and then flows out from the other end of the shell; the second fluid flows into one end of the tube pass and flows out from the other end of the tube pass. The second fluid exchanges heat with the first fluid in the shell pass during the flowing process.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a discontinuous spiral baffle heat exchanger for reducing leakage fluid. In the shell of this heat exchanger, several groups of successively connected baffle plate assemblies are arranged along the shell pass direction. The baffle plate assemblies are composed of multiple baffle plate units with the same structure. The baffle plate units are composed of a sector baffle and a triangular baffle that are vertically connected. Between every two adjacent baffle plate units, the sector baffle of the previous baffle plate unit is vertically connected to the triangular baffle of the next baffle plate unit; through the design of the discontinuous spiral baffle of this heat exchanger, a continuous spiral flow path is formed, which can effectively reduce the possibility of leakage fluid, and at the same time improve the heat exchange efficiency of the fluid; avoid the triangular leakage area formed between the discontinuous spiral baffle plates, and reduce the leakage flow rate of the shell pass fluid; using this heat exchanger can make the shell pass fluid flow completely spirally, fully exchange heat with the heat exchange tubes, and improve the heat exchange efficiency.

[0024] On the other hand, this heat exchanger forms a discontinuous spiral baffle through several groups of successively connected baffle plate assemblies, which can increase the degree of spiral scouring of the tube bundle by the shell pass fluid, improve the disturbance degree of fluid flow, increase the turbulent intensity of the shell pass fluid, make the heat exchange between the hot and cold fluids more sufficient, and at the same time is beneficial to reducing the deposition of dirt inside the heat exchanger, improving the convective heat transfer coefficient, making full use of the heat exchange area, and effectively improving the heat exchange performance of the heat exchanger.

[0025] On yet another hand, the solution of the present invention is reasonable, has a simple structure, is easy to process and implement, can effectively reduce the leakage fluid of the discontinuous spiral baffle, and can fully enhance the heat exchange effect of the discontinuous spiral baffle heat exchanger.

[0026] On still another hand, the present invention is of great significance for reducing energy loss, improving energy utilization efficiency, promoting energy conservation and emission reduction, and improving industrial production efficiency.

[0027] Preferably, in the present invention, the baffle plate assembly uses four baffle plate units with the same structure, where the sector baffles can be spliced into a complete ellipse or circle, enhancing the structural stability and sealing performance of the heat exchanger.

[0028] Preferably, in the present invention, the sector baffle is designed as a 1 / 4 circle and is connected to the triangular baffle of an isosceles triangle, which is not only convenient for processing but also improves the compactness and heat transfer efficiency of the heat exchanger.

[0029] Preferably, in the present invention, two adjacent triangular baffles are arranged vertically, and two triangular baffles apart are arranged in parallel. This design helps the fluid to form a stable flow state in the spiral flow channel, further reducing leakage and improving heat transfer efficiency.

[0030] Preferably, in the present invention, the spiral angle between every two adjacent baffle plate units is controlled within 15° - 45°, preferably 25°, ensuring the flow stability and heat transfer efficiency of the fluid in the heat exchanger.

[0031] Preferably, in the present invention, by arranging tube sheets at both ends of the shell of the heat exchanger body and inserting multiple heat exchange tubes, the heat exchanger can simultaneously achieve heat exchange in the tube side and the shell side, increasing the heat transfer area and heat transfer efficiency of the heat exchanger.

[0032] Preferably, in the present invention, the multiple heat exchange tubes are arranged in a square pattern, which helps to form a uniform fluid distribution inside the heat exchanger, further improving the heat transfer efficiency.

[0033] Preferably, in the present invention, inclined tube holes are formed on the sector baffle, and the heat exchange tubes are arranged through the tube holes. This design not only ensures the stability of the heat exchange tubes but also reduces the possibility of fluid leakage at the tube holes.

[0034] The present invention also provides a working method for a non - continuous spiral baffle heat exchanger that reduces fluid leakage. Based on the above - mentioned non - continuous spiral baffle heat exchanger that reduces fluid leakage, in this method, after the first fluid enters the shell, it flows spirally along the baffle plate unit and then flows out of the shell; the second fluid flows in from one end along the tube side and flows out from the other end. During the flow process, the second fluid fully exchanges heat with the first fluid in the shell side; due to the structural design of the non - continuous spiral baffle, a continuous spiral flow channel is formed, reducing the leakage of the fluid working medium and ensuring the heat transfer efficiency; this method has a simple principle, is easy to implement, and has high heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a front view of a non - continuous spiral baffle heat exchanger that reduces fluid leakage provided by an embodiment of the present invention;

[0036] Figure 2Schematic diagram of the tube sheet of a discontinuous spiral baffle heat exchanger for reducing leakage fluid provided in the embodiments of the present invention;

[0037] Figure 3 Side view of a discontinuous spiral baffle heat exchanger for reducing leakage fluid provided in the embodiments of the present invention;

[0038] Figure 4 Schematic diagram of the structure of multiple groups of baffle assemblies of a discontinuous spiral baffle heat exchanger for reducing leakage fluid provided in the embodiments of the present invention;

[0039] Figure 5 Schematic diagram of the structure of a group of baffle assemblies of a discontinuous spiral baffle heat exchanger for reducing leakage fluid provided in the embodiments of the present invention;

[0040] Figure 6 Schematic diagram of the spiral angle between baffle units provided in the embodiments of the present invention;

[0041] Figure 7 Schematic diagram of the structure of a baffle unit of a discontinuous spiral baffle heat exchanger for reducing leakage fluid provided in the embodiments of the present invention.

[0042] Reference numerals:

[0043] 1 - Shell, 2 - Heat exchange tube, 3 - Sector baffle, 4 - Shell-side fluid inlet conduit, 5 - Shell-side fluid outlet conduit, 6 - Tube sheet, 7 - Tube hole, 8 - Triangular baffle. Detailed implementation manners

[0044] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0047] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0049] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0050] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] Embodiment 1

[0052] Combined with what is mentioned in the background art, currently, although using a continuous spiral baffle shell-and-tube heat exchanger can improve heat transfer efficiency, prevent fouling and vibration, in actual applications, the continuous spiral baffle structure is relatively complex, difficult to process and install, and has a high manufacturing cost, which greatly limits its application in the actual production process; the discontinuous spiral baffle is relatively simple in the processing and installation process, and also has a low manufacturing cost. Moreover, in actual applications, it is also relatively convenient to replace the baffle plates. Therefore, in industry, the discontinuous spiral baffle is commonly used to replace the continuous spiral baffle to form an approximate spiral surface to make the fluid flow spirally; however, for the discontinuous spiral baffle, a part of the fluid will leak from the triangular area formed between adjacent baffle plates, resulting in the shell-side fluid being unable to flow completely spirally and flowing straight forward from the leakage space. This part of the fluid does not exchange heat fully with the heat exchange tubes, affecting the heat transfer between the fluid in the heat exchange tubes and the shell-side fluid and reducing the heat exchange efficiency.

[0053] Therefore, the present invention provides a discontinuous helical baffle heat exchanger and method for reducing leaked fluid, so as to solve the problem that the gaps existing in the discontinuous helical baffle sheets will cause leaked fluid, resulting in a poor heat transfer effect.

[0054] The present invention will be further described in detail below in conjunction with the drawings and embodiments:

[0055] As Figure 1 and Figure 4 shown, this embodiment provides a discontinuous helical baffle heat exchanger for reducing leaked fluid, including:

[0056] A heat exchanger body composed of a shell 1, a tube bundle, and a tube sheet 6; wherein, shell-side fluid inlet ducts 4 and shell-side fluid outlet ducts 5 are arranged at both ends of the shell 1; a plurality of heat exchange tubes 2 and several sets of baffle assemblies arranged along the shell side direction are arranged inside the shell 1, and several sets of baffle assemblies are connected in sequence; the tube bundle is composed of multiple heat exchange tubes 2. As Figure 2 shown, tube holes 7 arranged in an array are opened on the tube sheet 6, and multiple heat exchange tubes 2 are inserted into the tube holes 7 of the tube sheets 6 at the left and right ends of the shell 1; the tube sheets 6 at both ends are connected to the shell 1 through flanges.

[0057] As Figure 3 and Figure 5 shown, in this embodiment, the conventional baffle plates in the heat exchanger adopt several sets of baffle assemblies, which are arranged along the shell side direction, and several sets of baffle assemblies are connected in sequence.

[0058] As Figure 7 shown, in this embodiment, the baffle assembly is composed of 4 baffle units with the same structure; in this embodiment, the baffle unit includes a sector baffle 3 and a triangular baffle 8, that is, a triangular baffle 8 extends from one straight side of the sector baffle 3 to avoid the leakage space formed by the discontinuous helical baffle. The triangular baffle 8 does not cross the heat exchange tube 2, is arranged at the gap between the heat exchange tubes 2, and is perpendicular to the cross-section of the shell 1 of the heat exchanger; two adjacent triangular baffles 8 are perpendicular to each other, and two alternating triangular baffles 8 are parallel to each other.

[0059] In this embodiment, several inclined tube holes 7 are also opened on the sector baffle 3 for inserting the heat exchange tubes 2 to support the heat exchange tubes 2.

[0060] In this embodiment, the triangular baffle 8 is welded to one right-angle side of the discontinuous helical sector baffle 3. The thickness of the triangular baffle 8 shall not be greater than the gap distance between two heat exchange tubes 2, and each sector baffle 3 is independent; between every two adjacent baffle units, the sector baffle 3 of the previous baffle unit is perpendicularly connected to the triangular baffle 8 of the next baffle unit.

[0061] It can be seen that all the baffle plate units are connected in sequence to form a continuous spiral flow channel for the working medium (shell-side fluid) to pass through. That is, through the discontinuous spiral baffle plates, a continuous spiral flow channel is formed. The design of the triangular baffle 8 fills the leakage area, preventing the fluid from flowing straight forward through the leakage space, thus enabling the shell-side fluid to flow in a complete spiral manner.

[0062] This embodiment also provides the working principle of a discontinuous spiral baffle plate heat exchanger for reducing leakage fluid, which is as follows:

[0063] When this discontinuous spiral baffle plate heat exchanger for reducing leakage fluid is working, there are two working media in the heat exchanger, also called fluids. Among them, one fluid flows through the shell side, and the other fluid flows through the tube side. Specifically, after the shell-side fluid (i.e., the first fluid) enters the shell through the shell-side fluid inlet conduit, the shell-side fluid flows in a spiral manner along the baffle plate assembly and then flows out through the shell-side fluid outlet conduit. The tube-side fluid (i.e., the second fluid) flows in from one end of the tube side and flows out from the other end of the tube side. During the flow process, heat exchange between the shell-side fluid and the tube-side fluid is achieved.

[0064] Embodiment 2

[0065] This embodiment provides another discontinuous spiral baffle plate heat exchanger for reducing leakage fluid. The basic structure of this embodiment is the same as that of Embodiment 1, and the design details of the discontinuous spiral baffle plate heat exchanger are optimized, specifically including:

[0066] A shell 1, with a shell-side fluid inlet conduit 4 and a shell-side fluid outlet conduit 5 provided at both ends of the shell 1. Both ends of the shell 1 are connected to a fixed tube sheet 6 through flanges. The shell 1 contains heat exchange tubes 2 and a plurality of fan-shaped baffles 3 arranged in a discontinuous spiral. The fan-shaped baffles 3 are connected to the triangular baffle 8 by welding, enabling the fluid to flow in a complete and sufficient spiral manner.

[0067] In this embodiment, the tube-side fluid in the heat exchanger is water, and the shell-side fluid is also water. The inner diameter of the shell 1 of the heat exchanger is 175 mm; the wall thickness of the shell 1 is 5 mm; the length of the shell 1 is 1060 mm; the outer diameter of the heat exchange tube 2 is 19 mm; the wall thickness of the heat exchange tube 2 is 2 mm; the number of heat exchange tubes 2 is 32; the length of the heat exchange tube 2 is 1060 mm; the spacing between the heat exchange tubes 2 is 25 mm; the arrangement mode between the multiple heat exchange tubes 2 is square arrangement; the thickness of the fan-shaped baffles 3 and the triangular baffle 8 is 5 mm; the spiral angle of the discontinuous spiral baffle plate is 25°; the inner diameter of the inlet and outlet conduits is 35 mm; the length of the inlet and outlet conduits is 90 mm.

[0068] In this embodiment, the sector baffle 3 is a quarter circle; the triangular baffle 8 is an isosceles triangle; the radius of the sector baffle 3 is equal to the waist length of the triangular baffle 8; the first straight edge of the sector baffle 3 is connected to the waist of the triangular baffle 8 (i.e., the long side of the triangular baffle 8), and the second straight edge is connected to the waist of the triangular baffle 8 of the next baffle unit.

[0069] In this embodiment, the heat exchange tubes 2 are arranged in a square pattern, and there needs to be enough space between the heat exchange tubes 2 to place the triangular baffle 8 so that the overall baffle assembly forms a relatively continuous spiral flow channel.

[0070] In this embodiment, inclined tube holes 7 are opened on the sector baffle 3, and the heat exchange tubes 2 are arranged through the tube holes 7.

[0071] As Figure 6 shown, in this embodiment, the spiral angle β of the baffle unit is 25°; the baffle spiral angle is the angle between the normal direction of the baffle and the axis direction of the heat exchanger; the baffle spiral angle can be changed according to specific circumstances. The spiral angle in this embodiment is set to 15° - 45°, and the angle is not fixed. When the spiral angle of the baffle unit changes, the shape of the triangular baffle 8 will also change accordingly. The shape and size of the triangular baffle 8 should be consistent with the size of the transformed triangular area to eliminate the problem of fluid leakage in the triangular area. In this embodiment, the selected baffle is composed of multiple groups of quarter - circular sector baffles 3 and triangular baffles 8.

[0072] Thus, a non - continuous spiral baffle heat exchanger for reducing fluid leakage provided in this embodiment has the following advantages:

[0073] (A) In the present invention, triangular baffles are added to the commonly used quarter - ellipse or circular baffle plates to avoid the triangular leakage area formed between the non - continuous spiral baffle plates, reduce the shell - side fluid leakage flow rate, enable the fluid to flow in a more fully spiral manner, fully exchange heat with the heat exchange tubes, and improve the heat exchange efficiency.

[0074] (B) The non - continuous spiral baffle for reducing fluid leakage provided by the present invention can increase the degree of spiral scouring of the tube bundle by the shell - side fluid, improve the disturbance degree of fluid flow, increase the shell - side fluid turbulence intensity, make the heat exchange between the hot and cold fluids more sufficient, and at the same time is conducive to reducing the internal fouling deposition of the heat exchanger, improving the convective heat transfer coefficient, making full use of the heat exchange area, and effectively improving the heat exchange performance of the heat exchanger.

[0075] (C) The solution of the present invention is reasonable, the structure is simple, it is easy to process and implement, can effectively reduce the fluid leakage of the non - continuous spiral baffle, and can fully enhance the heat exchange effect of the non - continuous spiral baffle heat exchanger.

[0076] (D)The present invention is of great significance for reducing energy loss, improving energy utilization efficiency, promoting energy conservation and emission reduction, and enhancing industrial production efficiency.

[0077] In summary, the present invention provides a discontinuous helical baffle heat exchanger and method for reducing leakage fluid. Compared with the existing heat exchangers, it has the following advantages:

[0078] First of all, the continuous helical flow channel formed by the discontinuous helical baffle structure significantly improves the heat transfer efficiency of the fluid and effectively reduces the leakage of the fluid; secondly, through the design of four baffle units with the same structure, the sector baffles can be spliced into a complete ellipse or circle, which not only enhances the structural stability but also further improves the sealing performance; furthermore, the combined use of the sector baffle and the isosceles triangle baffle, as well as the connection method between them, enables the fluid to form a stable helical flow pattern during the flow process, enhancing the heat transfer effect; in addition, the vertical and parallel arrangements between adjacent triangular baffles ensure the uniformity of fluid flow and further improve the heat transfer efficiency. The precise design of the helical angle, such as 20 - 30° or a specific 25°, is aimed at optimizing the fluid flow and heat transfer effect; finally, through the tube sheet design of the heat exchanger body, the square arrangement of the heat exchange tubes, and the setting of inclined tube holes on the sector baffle, the heat exchanger is not only compact in structure, but also simple to operate, with high heat transfer efficiency and low leakage risk, and is an excellent heat transfer device.

[0079] The above embodiments are only one of the implementation manners capable of realizing the technical solution of the present invention. The scope of protection required by the present invention is not limited only by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by any person skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A discontinuous spiral baffle heat exchanger for reducing fluid leakage, characterized in that: It comprises a heat exchanger body, wherein a plurality of groups of baffle assemblies connected in sequence are arranged in a shell (1) of the heat exchanger body along the shell side direction; The baffle assembly includes a plurality of baffle units with the same structure; The baffle unit comprises a sector-shaped baffle (3) and a triangular baffle (8), wherein the sector-shaped baffle (3) and the triangular baffle (8) are vertically connected; Between every two adjacent baffle units, the fan-shaped baffle plate (3) of the preceding baffle unit is vertically connected to the triangular baffle plate (8) of the succeeding baffle unit; All baffle units are connected in sequence to form a continuous spiral flow channel for the working medium to pass through; The baffle assembly comprises four baffle units with the same structure; wherein the four sector-shaped baffles (3) in the same baffle unit can be spliced ​​into a circle; The fan-shaped baffle (3) is in the shape of a quarter circle; the triangular baffle (8) is in the shape of an isosceles triangle; the radius of the fan-shaped baffle (3) is equal to the waist length of the triangular baffle (8); the first straight edge of the fan-shaped baffle (3) is connected to the waist of the triangular baffle (8), and the second straight edge is connected to the waist of the triangular baffle (8) of the next baffle unit.

2. A discontinuous spiral baffle heat exchanger for reducing fluid leakage according to claim 1, characterized in that: Every two adjacent triangular baffles (8) are arranged vertically; every two separated triangular baffles (8) are arranged parallel to each other.

3. A discontinuous spiral baffle heat exchanger for reducing fluid leakage according to claim 1, characterized in that: The spiral angle between every two adjacent baffle units is 15°-45°.

4. A discontinuous spiral baffle heat exchanger for reducing fluid leakage according to claim 3, characterized in that: The spiral angle between every two adjacent baffle units is 25°.

5. A discontinuous spiral baffle heat exchanger for reducing fluid leakage according to claim 1, characterized in that: The heat exchanger body also includes tube sheets (6) arranged at both ends of the shell (1), and a plurality of heat exchange tubes (2) are inserted into the tube sheets (6); and the shell (1) is provided with a shell-side fluid inlet conduit (4) and a shell-side fluid outlet conduit (5).

6. A discontinuous spiral baffle heat exchanger for reducing fluid leakage according to claim 5, characterized in that: The plurality of heat exchange tubes (2) are arranged in a square shape.

7. A discontinuous spiral baffle heat exchanger for reducing fluid leakage according to claim 5, characterized in that: The sector-shaped baffle (3) is provided with an inclined tube hole (7), and the heat exchange tube (2) is arranged through the tube hole (7).

8. A method for operating a discontinuous spiral baffle heat exchanger to reduce fluid leakage, characterized in that: The discontinuous spiral baffle heat exchanger according to any one of claims 1 to 7 comprises: The first fluid flows in from one end of the shell (1), flows in a spiral along the continuous spiral flow channel formed by the baffle unit, and then flows out from the other end of the shell (1); the second fluid flows in from one end of the tube side and flows out from the other end of the tube side, and the second fluid exchanges heat with the first fluid in the shell side during the flow process.

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