High-efficiency chamber heat exchanger for pressure isolation station

Abstract

The present invention discloses a high-efficiency chamber heat exchanger for a pressure-separated station. Tube sheets are installed at both the front and rear ends of the heat exchange housing. The front head and the rear head are installed on the corresponding tube sheets. Four transverse partitions are installed on the front head. A vertical partition is installed in the middle of the cavity of the rear head. Two transverse partitions spaced apart in the vertical direction are arranged on the right side of the vertical partition, and two transverse partitions spaced apart in the vertical direction are arranged on the left side of the vertical partition. The transverse partitions on the right side and the transverse partitions on the left side are arranged in a staggered manner. Four vertically spaced chamber partition plates are arranged in the heat exchange housing. It occupies a small volume, has a high heat exchange efficiency, the temperature of the primary heat medium after heat exchange is lower than 60 °C, meeting the requirements for the recovery and utilization of the primary heat medium, and the temperature of the secondary heat medium after heat exchange is between 105 °C and 110 °C, so that the heat energy loss is small and the heat exchange effect is high. Moreover, double return tubes are adopted, which can adapt to the thermal expansion and contraction of the heat exchanger by itself, ensuring the service life of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to a heat exchanger, in particular to a high-efficiency chamber heat exchanger for a pressure isolation station. Background Art

[0002] A heat exchanger, also known as a heat exchanger, is a device that transfers part of the heat of a hot fluid to a cold fluid. It is widely used in the fields of chemical industry, petroleum, water treatment, heating ventilation, etc. In particular, in chemical production, a heat exchanger can be used as a heater, a cooler, a condenser, an evaporator, etc. There are many types of heat exchangers. Classified by heat transfer principle, there are wall-type heat exchangers, regenerative heat exchangers, fluid-connected indirect heat exchangers, direct contact heat exchangers, etc. Classified by structure, the most common ones are plate heat exchangers and shell-and-tube heat exchangers (also called tube-sheet heat exchangers).

[0003] A plate heat exchanger is one of the most common heat exchangers, and it has a long history of application in industry. Its main structure is a box body, in which multiple groups of heat exchange plates and rubber strips between the plates are installed. Fluid media at different temperatures flow between the heat exchange plates to achieve heat exchange. To improve the heat exchange efficiency, a certain number of transverse baffle plates are usually installed in the box body. The baffle plates can not only prevent the short circuit of fluids at different temperatures, increase the fluid velocity, but also force the fluid to flow through in a specified path for multiple cross-flows, greatly increasing the degree of turbulence. Although plate heat exchangers are widely used and dominate all heat exchangers, plate heat exchangers also have significant drawbacks: 1. Large volume and large floor space; 2. The connection and sealing between the heat exchange plates need to be brazed, with complex manufacturing processes, high costs, and easy occurrence of false soldering; 3. Narrow flow channels affect the flow velocity, thus affecting the heat exchange efficiency and having low heat exchange efficiency; 4. Poor outlet sealing, easy leakage, frequent replacement of rubber strips, and high maintenance costs; 5. Easy to block and not suitable for fluids containing suspended substances; 6. Difficult to clean after scaling and large flow resistance.

[0004] After power generation in a power station, there are high-temperature steam and high-temperature water, and both high-temperature water and high-temperature steam have been specially treated, such as water softening. Therefore, to save water treatment costs, the high-temperature water needs to be recycled. Since the temperature of the high-temperature water can reach 120 °C, it has high thermal energy. If directly discharged, it will cause a large amount of heat energy loss and water resource waste. If directly recycled, it will not meet the recycling standard. Currently, the heat exchangers used, in order to achieve rapid cooling of high-temperature water, have a large volume, which in turn leads to a large floor space. Moreover, after use, the heat exchanger is prone to scaling, resulting in a short service life and troublesome maintenance. Furthermore, its heat exchange efficiency is not high. After the first heat medium heat exchange, the water temperature is difficult to drop below 60 °C, resulting in the unqualified recovery temperature of the water, and the temperature of the second heat medium is also relatively low, resulting in a large amount of heat energy loss. Summary of the Invention

[0005] The object of the present invention is to overcome the shortcomings of the prior art and provide a high-efficiency chamber heat exchanger for a pressure isolation station.

[0006] The object of the present invention is achieved by the following technical solutions: A high-efficiency chamber heat exchanger for a pressure isolation station, comprising a heat exchange housing, a front head, a rear head, double return tubes and tube sheets. Tube sheets are installed at both the front and rear ends of the heat exchange housing. The front head and the rear head are installed on the corresponding tube sheets. Four transverse partition plates are installed on the front head. The cavity of the front head is divided by the transverse partition plates into a first mixing chamber, a second mixing chamber, a third mixing chamber, a fourth mixing chamber and a fifth mixing chamber which are distributed successively from top to bottom. A vertical partition plate is installed in the middle of the cavity of the rear head. Two transverse partition plates which are spaced apart in the vertical direction are arranged on the right side of the vertical partition plate. Two transverse partition plates which are spaced apart in the vertical direction are arranged on the left side of the vertical partition plate. The transverse partition plates on the right side and the left side are arranged in a staggered manner. And the cavity of the rear head is divided by the transverse partition plates and the vertical partition plate into a first mixing and distribution chamber, a second mixing and distribution chamber, a third mixing and distribution chamber and a fourth mixing and distribution chamber. Four vertically spaced chamber partition plates are arranged in the heat exchange housing. The inner cavity of the heat exchange chamber is divided by the chamber partition plates into a first heat exchange chamber, a second heat exchange chamber, a third heat exchange chamber, a fourth heat exchange chamber and a fifth heat exchange chamber which are distributed successively from top to bottom. And adjacent two heat exchange chambers are communicated. The volumes of adjacent two heat exchange chambers are different and are distributed in a large-small pattern. The volume of the first heat exchange chamber is smaller than the volume of the fifth heat exchange chamber. A number of double return tubes are installed in the first heat exchange chamber, the second heat exchange chamber, the third heat exchange chamber, the fourth heat exchange chamber and the fifth heat exchange chamber. Both ends of the double return tubes are installed on the corresponding tube sheets. And the first mixing and distribution chamber is communicated with the first mixing chamber and the second mixing chamber through the double return tubes. The second mixing and distribution chamber is communicated with the second mixing chamber and the third mixing chamber through the double return tubes. The third mixing and distribution chamber is communicated with the third mixing chamber and the fourth mixing chamber through the double return tubes. The fourth mixing and distribution chamber is communicated with the fourth mixing chamber and the fifth mixing chamber through the double return tubes. A primary heat medium inlet communicated with the first mixing chamber is arranged at the top of the front head. A primary heat medium outlet communicated with the fifth mixing chamber is arranged at the bottom of the front head. A secondary heat medium outlet communicated with the first heat exchange chamber is arranged at the top of the heat exchange housing. A secondary heat medium inlet communicated with the fifth heat exchange chamber is arranged at the bottom of the heat exchange housing.

[0007] Optionally, a number of installation through holes are formed in the tube sheet. A number of limiting grooves are formed on the hole wall of the installation through hole. Limiting convex rings matching with the limiting grooves are arranged at both ends of the double return tube. Both ends of the double return tube are installed in the corresponding installation through holes, and the limiting convex rings are stuck in the corresponding limiting grooves.

[0008] Optionally, the installation through hole is a stepped through hole. The limiting groove is located on the hole wall of the small hole of the stepped through hole. Bending portions which are radially turned outwards are further arranged at both ends of the double return tube. The bending portions are located in the large hole of the stepped through hole.

[0009] Optionally, the outer circumference of the double helix tube has a plurality of helical grooves distributed in a spiral manner, and the helical grooves are smoothly connected to the outer wall of the double helix tube. The inner circumference of the double helix tube has a plurality of helical ridges distributed in a spiral manner, and the helical ridges are smoothly connected to the inner wall of the double helix tube. The lead of the helical groove and the lead of the helical ridge have the same helix direction, and the starting point of the helical groove corresponds to the starting point of the helical ridge.

[0010] Optionally, an annular clamping groove is provided on the mounting surface of the tube sheet, a limiting ring is provided on the end surface of the front head and the rear head, the limiting ring is clamped in the corresponding annular clamping groove, and a sealing gasket is provided between the limiting ring and the annular clamping groove.

[0011] Optionally, a partition groove is also provided on the mounting surface of the tube sheet. The transverse partition of the front head is clamped in the partition groove of the corresponding tube sheet, and the vertical partition and the transverse partition of the rear head are clamped in the partition groove of the corresponding tube sheet.

[0012] Optionally, a primary heat medium blowdown port is provided at the bottom of the rear head, and the primary heat medium blowdown port communicates with the fourth mixing and distribution chamber.

[0013] Optionally, a chamber communication hole is provided at the end of the chamber partition plate, and the chamber communication holes of two adjacent chamber partition plates are distributed diagonally.

[0014] Optionally, a plurality of staggered baffles are provided in each of the first heat exchange chamber, the second heat exchange chamber, the third heat exchange chamber, the fourth heat exchange chamber and the fifth heat exchange chamber.

[0015] The present invention has the following advantages: The pressure-isolating station high-efficiency chamber heat exchanger of the present invention occupies a small volume, has a high heat exchange efficiency, the temperature of the primary heat medium after heat exchange is lower than 60 °C, meeting the requirements for the recovery and utilization of the primary heat medium, while the temperature of the secondary heat medium after heat exchange is between 105 °C and 110 °C, so that the heat energy loss is small, the heat exchange effect is high, and a double helix tube is adopted, which can adapt to the thermal expansion and contraction of the heat exchanger itself, ensuring the service life of the heat exchanger. During use, the heat exchanger is not prone to scaling, so it has a long service life and a long maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic structural diagram of the tube sheet connected to the front head;

[0018] Figure 3 is a schematic structural diagram of the front head Figure 1 ;

[0019] Figure 4 is a schematic structural diagram of the front head Figure 2 ;

[0020] Figure 5 Schematic structural diagram of the tube sheet connected to the rear head

[0021] Figure 6 Schematic diagram of the structure of the rear head Figure 1 ;

[0022] Figure 7 Schematic diagram of the structure of the rear head Figure 2 ;

[0023] Figure 8 Schematic distribution diagram of the heat exchange cavity;

[0024] Figure 9 Schematic structural diagram of the double-helix tube

[0025] Figure 10 Schematic installation diagram of the double-helix tube and the tube sheet;

[0026] In the figure, 1 - heat exchange shell, 2 - front head, 3 - rear head, 4 - tube sheet, 5 - primary heat medium inlet, 6 - primary heat medium outlet, 7 - secondary heat medium inlet, 8 - secondary heat medium outlet, 9 - double-helix tube, 11 - first heat exchange cavity, 12 - second heat exchange cavity, 13 - third heat exchange cavity, 14 - fourth heat exchange cavity, 15 - fifth heat exchange cavity, 16 - chamber partition plate, 17 - baffle plate, 21 - first mixing chamber, 22 - second mixing chamber, 23 - third mixing chamber, 24 - fourth mixing chamber, 25 - fifth mixing chamber, 26 - transverse partition plate, 31 - first mixing and distribution chamber, 32 - second mixing and distribution chamber, 33 - third mixing and distribution chamber, 34 - fourth mixing and distribution chamber, 35 - vertical partition plate, 36 - transverse partition plate, 37 - primary heat medium blowdown port, 41 - annular card slot, 42 - partition slot, 43 - installation through hole, 44 - limit groove, 91 - limit ring, 92 - bending part, 93 - spiral groove, 94 - spiral rib. Specific embodiments

[0027] 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 in conjunction with 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 accompanying drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents 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.

[0029] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0030] It should be noted that like reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. 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 of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be 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, 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.

[0033] As Figure 1 shown, the pressure isolation station high-efficiency chamber heat exchanger includes a heat exchange housing 1, a front head 2, a rear head 3, a double return tube 9 and a tube sheet 4. Tube sheets 4 are installed at both the front and rear ends of the heat exchange housing 1. Preferably, the cross-section of the heat exchange housing 1 is waist-shaped. The front head 2 and the rear head 3 are installed on the corresponding tube sheets 4. A cavity will be formed between the front head 2 and the tube sheet 4, and a cavity will also be formed between the rear head 3 and the tube sheet 4. As Figure 3 shown, four transverse partitions 26 are installed on the front head 2. The cavity of the front head 2 is divided by the transverse partitions 26 into a first mixing chamber 21, a second mixing chamber 22, a third mixing chamber 23, a fourth mixing chamber 24 and a fifth mixing chamber 25 which are distributed in sequence from top to bottom. As Figure 6As shown in the figure, a vertical partition plate 35 is installed in the middle of the cavity of the rear head 3. Two horizontal partition plates 36 are arranged at intervals in the vertical direction on the right side of the vertical partition plate 35, and two horizontal partition plates 36 are arranged at intervals in the vertical direction on the left side of the vertical partition plate 35. The horizontal partition plates 36 on the right side and the horizontal partition plates 36 on the left side are staggered. The cavity of the rear head 3 is divided into a first mixing and distribution cavity 31, a second mixing and distribution cavity 32, a third mixing and distribution cavity 33, and a fourth mixing and distribution cavity 34 by the horizontal partition plates 36 and the vertical partition plate 35. Since the horizontal partition plates 36 on the right side and the horizontal partition plates 36 on the left side are staggered, the first mixing and distribution cavity 31 is in the shape of "┌", and the fourth mixing and distribution cavity 34 is in the shape of "┘". Four vertically spaced chamber partition plates 16 are arranged in the heat exchange housing 1, as Figure 8 shown. The inner cavity of the heat exchange cavity is divided into a first heat exchange cavity 11, a second heat exchange cavity 12, a third heat exchange cavity 13, a fourth heat exchange cavity 14, and a fifth heat exchange cavity 15 which are arranged in sequence from top to bottom by the chamber partition plates 16, and two adjacent heat exchange cavities are communicated. Further, chamber communication holes are opened at the ends of the chamber partition plates 16, and the chamber communication holes of two adjacent chamber partition plates 16 are diagonally distributed. A number of double return tubes 9 are installed in the first heat exchange cavity 11, the second heat exchange cavity 12, the third heat exchange cavity 13, the fourth heat exchange cavity 14, and the fifth heat exchange cavity 15. The two ends of the double return tubes 9 are installed on the corresponding tube plates 4. The first mixing and distribution cavity 31 is communicated with the first mixing cavity 21 and the second mixing cavity 22 through the double return tubes 9, the second mixing and distribution cavity 32 is communicated with the second mixing cavity 22 and the third mixing cavity 23 through the double return tubes 9, the third mixing and distribution cavity 33 is communicated with the third mixing cavity 23 and the fourth mixing cavity 24 through the double return tubes 9, and the fourth mixing and distribution cavity 34 is communicated with the fourth mixing cavity 24 and the fifth mixing cavity 25 through the double return tubes 9, as Figure 4 shown. A primary heat medium inlet 5 communicated with the first mixing cavity 21 is arranged at the top of the front head 2, and a primary heat medium outlet 6 communicated with the fifth mixing cavity 25 is arranged at the bottom of the front head, as Figure 1As shown in the figure, a secondary heat medium outlet 8 communicating with the first heat exchange chamber 11 is provided at the top of the heat exchange housing 1, and a secondary heat medium inlet 7 communicating with the fifth heat exchange chamber 15 is provided at the bottom of the heat exchange housing 1. During heat exchange, the primary heat medium enters the first mixing chamber 21 from the primary heat medium inlet 5, and then enters the first mixing and distribution chamber 31 through the double return tube 9. After being mixed and redistributed by the first mixing and distribution chamber 31, the primary heat medium enters the second mixing chamber 22 through the double return tube 9 again. Then, after being mixed by the second mixing chamber 22, the primary heat medium enters the second mixing and distribution chamber 32 through the double return tube 9. After being mixed and redistributed by the second mixing and distribution chamber 32, the primary heat medium enters the third mixing chamber 23 through the double return tube 9. After being mixed by the third mixing chamber 23, the primary heat medium enters the third mixing and distribution chamber 33 through the double return tube 9. After being mixed and redistributed by the third mixing and distribution chamber 33, the primary heat medium enters the fourth mixing chamber 24 through the double return tube 9. After being mixed by the fourth mixing chamber 24, the primary heat medium enters the fourth mixing and distribution chamber 34 through the double return tube 9. After being mixed and distributed by the fourth mixing and distribution chamber 34, the primary heat medium enters the fifth mixing chamber 25 through the double return tube 9, and finally is discharged through the primary heat medium outlet 6 of the fifth mixing chamber 25. While the primary heat medium is flowing, the secondary heat medium enters the fifth heat exchange chamber 15 from the secondary heat medium inlet 7, and then sequentially enters the fourth heat exchange chamber 14, the third heat exchange chamber 13, the second heat exchange chamber 12, and the first heat exchange chamber 11, and finally is discharged through the secondary heat medium outlet 8. Therefore, in this embodiment, the primary heat medium has eight heat exchange strokes, and the secondary heat medium has five heat exchange strokes, so that the heat energy of the primary heat medium can be fully utilized, and the heat exchange temperature of the secondary heat medium can reach the required value. At the same time, under the condition of the same heat exchange efficiency, the volume of this heat exchanger is small, and under the condition of the same volume, the heat exchange efficiency of this heat exchanger is high. Specifically, the temperature of the primary heat medium can be as high as 110°C - 120°C, and after heat exchange, the water temperature discharged can reach 50°C - 60°C, thus meeting the requirement of the return water. After heat exchange, the temperature of the secondary heat medium can reach 105°C - 110°C, so that this pressure-isolating station high-efficiency chamber heat exchanger has high heat exchange efficiency and high heat energy utilization rate.

[0034] In this embodiment, the volumes of two adjacent heat exchange chambers are different and are distributed in a large - small pattern. The volume of the first heat exchange chamber 11 is smaller than that of the fifth heat exchange chamber 15. That is to say, the volume of the fourth heat exchange chamber 14 is greater than the volumes of the fifth heat exchange chamber 15 and the third heat exchange chamber 13 respectively, and the volume of the second heat exchange chamber 12 is greater than the volumes of the third heat exchange chamber 13 and the first heat exchange chamber 11. Therefore, when the secondary heat medium flows in the heat exchange housing 1, due to the change in the volume of the heat exchange chambers, an impact flow will be formed between the heat exchange chambers for the secondary heat medium, thereby impacting the outer surface of the double - helical tube 9, making it difficult for dirt to accumulate on the outer surface of the double - helical tube 9. At the same time, due to the change in volume, especially the volume of the first heat exchange chamber 11 being smaller than that of the fifth heat exchange chamber, and as the temperature of the secondary heat medium continuously rises during the heat exchange process, the secondary heat medium expands, which will squeeze the heat exchange chambers, resulting in the pressure in the first heat exchange chamber 11 being greater than the pressure in the fifth heat exchange chamber 15. Thus, the amount of the secondary heat medium is increased, and its heat exchange temperature can reach 105°C - 110°C, while the primary heat medium can be reduced to below 60°C, thereby meeting the requirements for the recovery and reuse of the primary heat medium.

[0035] In this embodiment, as Figure 2 and Figure 5 shown, a number of mounting through - holes 43 are formed on the tube sheet 4. As Figure 10 shown, a number of limiting grooves are formed on the pore wall of the mounting through - hole 43. Limiting convex rings matching the limiting grooves are provided at both ends of the double - helical tube 9. Both ends of the double - helical tube 9 are installed in the corresponding mounting through - holes 43, and the limiting convex rings are stuck in the corresponding limiting grooves. Further, the mounting through - hole 43 is a stepped through - hole, and the limiting grooves are located on the pore wall of the small hole of the stepped through - hole. Radially outward - folded bending portions 92 are also provided at both ends of the double - helical tube 9, and the bending portions 92 are located in the large hole of the stepped through - hole. After the double - helical tube 9 is manufactured in the factory, the diameters of both ends are the same as the diameter of the middle part, and the mounting through - holes 43 on the tube sheet 4 match the diameter of the middle part. Then, both ends of the double - helical tube 9 are respectively inserted into the mounting through - holes 43 of the corresponding tube sheet 4, and then a swelling - pressure device is used to press - connect both ends of the double - helical tube 9 with the corresponding tube sheet 4. During the swelling - pressure process, since limiting grooves are provided in the mounting through - holes 43, limiting convex rings are formed at both ends of the double - helical tube 9 through swelling - pressure, and the limiting convex rings are stuck in the corresponding limiting grooves, thereby axially fixing the double - helical tube 9 and ensuring the reliability of the use of the double - helical tube 9. Further, after swelling - pressure between a number of limiting grooves and a number of limiting convex rings, close fitting is achieved, and a number of limiting grooves and a number of limiting convex rings form a labyrinth seal. Therefore, there is no need to weld between the double - helical tube 9 and the tube sheet 4, and further, the double - helical tube 9 is convenient to disassemble and assemble.

[0036] In this embodiment, as Figure 9As shown in the figure, the outer circumference of the double-helix tube 9 has a plurality of helical grooves 93 distributed in a spiral manner. The helical grooves 93 are smoothly connected to the outer wall of the double-helix tube 9. The inner circumference of the double-helix tube 9 has a plurality of helical ridges 94 distributed in a spiral manner. The helical ridges 94 are smoothly connected to the inner wall of the double-helix tube 9. The lead of the helical grooves 93 and the lead of the helical ridges 94 have the same helix direction, and the starting points of the helical grooves 93 and the helical ridges 94 correspond to each other. During manufacturing, the helical grooves 93 are rolled on the outer surface of the double-helix tube 9 by a rolling method on the outer circumference of the double-helix tube 9. While rolling the helical grooves 93, the helical ridges 94 are formed on the inner wall of the double-helix tube 9. Due to the smooth connection between the helical grooves 93 and the outer wall of the double-helix tube 9 and the smooth connection between the helical ridges 94 and the inner wall of the double-helix tube 9, the water flow can achieve smooth flow on both the inner and outer surfaces of the double-helix tube 9, and thus will not concentrate on flushing a certain area, thereby ensuring the service life of the double-helix tube 9. Moreover, due to the existence of the helical grooves, the secondary heat medium will form a turbulent flow under the guiding action of the helical grooves, thereby improving the mixing efficiency between the secondary heat media and ensuring the uniformity of heat exchange.

[0037] In this embodiment, since there is a secondary heat medium in the heat exchange housing 1, during the heat exchange process, the heat exchange housing 1 will change in length due to thermal expansion and contraction. Similarly, the double-reheater tube 9 will also change in length due to thermal expansion and contraction. Specifically, when the double-reheater tube 9 becomes longer, the double-reheater tube 9 can rotate a certain angle away from the spiral direction of the spiral groove 93, thereby releasing a certain length. When the double-reheater tube 9 needs to become shorter, the double-reheater tube 9 can rotate a certain angle along the spiral direction, thereby contracting a certain length and making the double-reheater tube 9 shorter. For example, if the spiral direction of the spiral groove 93 is right-handed, when the double-reheater tube 9 is heated, at this time, the double-reheater tube 9 twists a certain angle along the left-handed direction, and then releases a certain length, so that the length of the double-reheater tube 9 can adapt to thermal expansion. When the double-reheater tube 9 is cooled, the double-reheater tube 9 twists a certain angle along the right-handed direction, and then contracts a certain length, so that the length of the double-reheater tube 9 can adapt to cold contraction. When the heat exchange housing 1 expands thermally, the length of the heat exchange housing 1 becomes longer. At this time, the double-reheater tube 9 needs to adaptively become longer. Since the distance between the two tube plates 4 becomes longer after the heat exchange housing 1 becomes longer, the tube plate 4 then applies a pulling force to the double-reheater tube 9. Under the action of the pulling force, the double-reheater tube 9 twists a certain angle along the left-handed direction, and then releases a certain length. When the heat exchange housing 1 contracts thermally, the length of the heat exchange housing 1 becomes shorter. At this time, the double-reheater tube 9 needs to adaptively become shorter. Since the distance between the two tube plates 4 becomes shorter after the heat exchange housing 1 becomes shorter, the tube plate 4 can apply a pushing force to the double-reheater tube 9 through the limiting groove. Under the action of the pushing force, the double-reheater tube 9 twists a certain angle along the right-handed direction, and then contracts a certain length. Therefore, when the double-reheater tube 9 is in use, it can adapt to the change in length according to thermal expansion and contraction. Moreover, due to the adaptive change in the length of the double-reheater tube 9, the double-reheater tube 9 is not easily fouled. Even if fouled, during the length change of the double-reheater tube 9, the fouling will fall off, thus realizing the self-cleaning ability of the double-reheater tube 9. And because the double-reheater tube 9 is installed by expansion pressure, the formed limiting convex ring is stuck in the limiting groove, which is convenient for the tube plate 4 to apply a pulling force or a pushing force to the double-reheater tube 9.

[0038] In this embodiment, as Figure 2 and Figure 5As shown in the figure, an annular clamping groove 41 is formed on the mounting surface of the tube sheet 4. A limiting ring 91 is provided on the end surfaces of the front head 2 and the rear head 3. The limiting ring 91 is clamped in the corresponding annular clamping groove 41, and a gasket is provided between the limiting ring 91 and the annular clamping groove 41. Further, a partition groove 42 is also formed on the mounting surface of the tube sheet 4. The transverse partition 26 of the front head 2 is clamped in the corresponding partition groove 42 of the tube sheet 4, and the vertical partition 35 and the transverse partition 36 of the rear head 3 are clamped in the corresponding partition groove 42 of the tube sheet 4. During installation, the limiting ring 91 is clamped in the annular clamping groove 41, the transverse partition 26 of the front head 2 is clamped in the corresponding partition groove 42 of the tube sheet 4, and the vertical partition 35 and the transverse partition 36 of the rear head 3 are clamped in the corresponding partition groove 42 of the tube sheet 4. Gaskets are installed in both the annular clamping groove 41 and the partition groove 42, so as to ensure the independence between the mixing chambers and between the mixing and distribution chambers.

[0039] In this embodiment, as Figure 7 shown, a primary heat medium drain port 37 is provided at the bottom of the rear head 3. The primary heat medium drain port 37 is communicated with the fourth mixing and distribution chamber 34, and the dirt of the primary heat medium can be discharged through the primary heat medium drain port 37. Further, a secondary heat medium drain port is also formed at the bottom of the heat exchange housing 1, and the dirt of the secondary heat medium is discharged from the secondary heat medium drain port.

[0040] In this embodiment, as Figure 8 shown, a plurality of staggered baffles 17 are provided in each of the first heat exchange chamber 11, the second heat exchange chamber 12, the third heat exchange chamber 13, the fourth heat exchange chamber 14 and the fifth heat exchange chamber 15. Due to the staggered baffles 17, the secondary heat medium flows in a serpentine shape when flowing in the heat exchange chamber, thereby increasing the heat exchange travel and time of the secondary heat medium, and at the same time increasing the disturbance of the secondary heat medium in the heat exchange chamber, further ensuring the heat exchange temperature of the high-efficiency chamber heat exchanger of the pressure isolation station.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. High-efficiency chamber heat exchanger for pressure isolation station, Characterized in that: It includes a heat exchange housing, a front head, a rear head, double return tubes and tube sheets. Tube sheets are installed at both the front and rear ends of the heat exchange housing. The front head and the rear head are installed on the corresponding tube sheets. Four transverse partitions are installed on the front head. The cavity of the front head is divided by the transverse partitions into a first mixing chamber, a second mixing chamber, a third mixing chamber, a fourth mixing chamber and a fifth mixing chamber which are distributed successively from top to bottom. A vertical partition is installed in the middle of the cavity of the rear head. Two horizontally spaced transverse partitions are arranged on the right side of the vertical partition, and two horizontally spaced transverse partitions are arranged on the left side of the vertical partition. The transverse partitions on the right side are staggered with the transverse partitions on the left side. And the cavity of the rear head is divided by the transverse partitions and the vertical partition into a first mixing and distribution chamber, a second mixing and distribution chamber, a third mixing and distribution chamber and a fourth mixing and distribution chamber. Four vertically spaced chamber partition plates are arranged in the heat exchange housing. The inner cavity of the heat exchange housing is divided by the chamber partition plates into a first heat exchange chamber, a second heat exchange chamber, a third heat exchange chamber, a fourth heat exchange chamber and a fifth heat exchange chamber which are distributed successively from top to bottom. And adjacent two heat exchange chambers are communicated, and the volumes of adjacent two heat exchange chambers are not the same and are distributed in a large-small pattern. The volume of the first heat exchange chamber is smaller than the volume of the fifth heat exchange chamber. A number of double return tubes are installed in the first heat exchange chamber, the second heat exchange chamber, the third heat exchange chamber, the fourth heat exchange chamber and the fifth heat exchange chamber. The two ends of the double return tubes are installed on the corresponding tube sheets. And the first mixing and distribution chamber is communicated with the first mixing chamber and the second mixing chamber through the double return tubes. The second mixing and distribution chamber is communicated with the second mixing chamber and the third mixing chamber through the double return tubes. The third mixing and distribution chamber is communicated with the third mixing chamber and the fourth mixing chamber through the double return tubes. The fourth mixing and distribution chamber is communicated with the fourth mixing chamber and the fifth mixing chamber through the double return tubes. A primary heat medium inlet communicated with the first mixing chamber is arranged at the top of the front head. A primary heat medium outlet communicated with the fifth mixing chamber is arranged at the bottom of the front head. A secondary heat medium outlet communicated with the first heat exchange chamber is arranged at the top of the heat exchange housing. A secondary heat medium inlet communicated with the fifth heat exchange chamber is arranged at the bottom of the heat exchange housing. A number of installation through holes are opened on the tube sheets. A number of limiting grooves are opened on the hole walls of the installation through holes. Limiting convex rings matched with the limiting grooves are arranged at both ends of the double return tubes. The two ends of the double return tubes are installed in the corresponding installation through holes, and the limiting convex rings are stuck in the corresponding limiting grooves. Partition grooves are also opened on the installation surfaces of the tube sheets. The transverse partitions of the front head are stuck in the partition grooves of the corresponding tube sheets. The vertical partition and the transverse partitions of the rear head are stuck in the partition grooves of the corresponding tube sheets. Chamber communication holes are opened at the ends of the chamber partition plates. The chamber communication holes of two adjacent chamber partition plates are distributed diagonally.

2. The high-efficiency chamber heat exchanger for pressure isolation station according to claim 1, It is characterized in that: The installation through hole is a stepped through hole, the limiting groove is located on the wall of the small hole of the stepped through hole, and both ends of the double rifled tube are also provided with bending parts that are radially turned outwards, and the bending parts are located in the large hole of the stepped through hole.

3. The high-efficiency chamber heat exchanger of the pressure-separating station according to claim 2, It is characterized in that: The outer circumference of the double rifled tube has a plurality of helical grooves distributed in a spiral, the helical grooves are smoothly connected to the outer wall of the double rifled tube, the inner circumference of the double rifled tube has a plurality of helical ridges distributed in a spiral, the helical ridges are smoothly connected to the inner wall of the double rifled tube, the lead of the helical groove and the lead of the helical ridge have the same helix direction, and the starting point of the helical groove corresponds to the starting point of the helical ridge.

4. The high-efficiency chamber heat exchanger of the pressure-separating station according to any one of claims 1 to 3, It is characterized in that: An annular clamping groove is formed on the installation surface of the tube sheet, a limiting ring is arranged on the end surfaces of the front head and the rear head, the limiting ring is clamped in the corresponding annular clamping groove, and a sealing gasket is arranged between the limiting ring and the annular clamping groove.

5. The high-efficiency chamber heat exchanger of the pressure-separating station according to any one of claims 1 to 3, It is characterized in that: A primary heat medium blowdown port is arranged at the bottom of the rear head, and the primary heat medium blowdown port is communicated with the fourth mixing and distribution chamber.

6. The high-efficiency chamber heat exchanger of the pressure-separating station according to claim 1, It is characterized in that: A number of staggered baffles are arranged in the first heat exchange chamber, the second heat exchange chamber, the third heat exchange chamber, the fourth heat exchange chamber and the fifth heat exchange chamber.

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