Horizontal shell-and-tube heat exchanger capable of reducing scaling

Abstract

The invention discloses a horizontal shell-and-tube heat exchanger capable of reducing scaling, and relates to the technical field of shell-and-tube heat exchangers. The heat exchanger comprises heat exchange tubes, the inner side face of a shell is fixedly connected with a tube plate, the inner side face of the tube plate is fixedly connected with the outer side faces of the heat exchange tubes, a plurality of heat exchange tubes are evenly distributed in the shell, tube blocks are fixedly connected with one side of the tube plate, the tube blocks are fixedly connected with the inner side face of the shell, and the inner side faces of the tube blocks are fixedly connected with the outer side faces of the heat exchange tubes. The side, close to the end cover, of the tube block is arc-shaped, the end of the heat exchange tube is attached to the arc-shaped surface of the tube block, when tube pass fluid enters the heat exchange tube, the smooth arc-shaped surface can guide the tube pass fluid to enter the heat exchange tube, impact between the tube pass fluid and the tube plate is reduced, the attachment probability of impurities is reduced, blockage at a tube opening of the heat exchange tube is avoided, and the service life of the heat exchange tube is prolonged. And the roughness of the pipe block and the end part of the heat exchange pipe is also reduced during long-time use, and the adhesion difficulty of scale is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shell-and-tube heat exchangers, and particularly relates to a horizontal shell-and-tube heat exchanger for reducing fouling. Background Art

[0002] A horizontal shell-and-tube heat exchanger is a surface heat exchanger with the wall surface of the tube bundle in a closed shell as the heat transfer surface. It mainly consists of parts such as a shell, a tube bundle, a tube sheet, and a head. The shell is circular, with parallel tube bundles installed inside. The two ends of the tube bundle are fixed to the tube sheet. For the two fluids exchanging heat therein, one flows inside the tubes, and its path is called the tube pass; the other flows outside the tubes, and its path is called the shell pass. To improve the heat transfer coefficient of the fluid outside the tubes, a certain number of transverse baffles are usually installed in the shell to make the fluid flow through the tube bundle in a multiple cross-flow manner along the specified path, increasing the fluid velocity and enhancing the turbulence degree. It has the advantages of simple structure, low cost, high temperature and high pressure resistance, mature manufacturing process, strong adaptability, wide material selection range, etc., and is widely used in industrial fields such as chemical industry, petroleum, refrigeration, nuclear energy, and power.

[0003] When the heat exchanger is working, due to the change in temperature, the solubility of the fouling substances in the fluid inside the tube pass will change significantly, which is extremely likely to cause the formation of water scale, affecting the heat transfer efficiency of the heat exchange tubes and even causing blockage. When dealing with some tube pass fluids containing impurities, it is necessary to filter the fluid to prevent impurities from adhering to the inside of the tube pass and providing attachment points for water scale. Therefore, we propose a horizontal shell-and-tube heat exchanger for reducing fouling. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a horizontal shell-and-tube heat exchanger for reducing fouling, including:

[0005] A housing, the bottom of the housing is fixedly connected with a support plate, and the open end of the housing is fixedly connected with an end cover through bolts;

[0006] A heat exchange mechanism, the heat exchange mechanism is arranged inside the housing, and the surface of the heat exchange mechanism is fixedly connected with the inner side surface of the housing;

[0007] An anti-blocking mechanism, the anti-blocking mechanism is arranged inside the end cover, and the surface of the anti-blocking mechanism is fixedly connected with the inner side surface of the end cover;

[0008] Among them, the heat exchange mechanism includes:

[0009] Heat exchange tubes, the heat exchange tubes are arranged in a U shape, both ends of the heat exchange tubes face the end cover, the inner side surface of the housing is fixedly connected with a tube sheet, the inner side surface of the tube sheet is fixedly connected with the outer side surface of the heat exchange tubes, and a plurality of the heat exchange tubes are evenly distributed inside the housing;

[0010] A tube block, which is fixedly connected to one side of the tube sheet close to the end cover. The outer side surface of the tube block is fixedly connected to the inner side surface of the shell, and the inner side surface of the tube block is fixedly connected to the outer side surface of the heat exchange tube;

[0011] One side of the tube block close to the end cover is arranged in an arc shape, and the end of the heat exchange tube fits against the arc surface of the tube block;

[0012] The tube-side fluid enters the heat exchange tube from the upper half of the end cover, flows along the heat exchange tube and enters the lower half of the end cover. At the same time, the shell-side medium enters from the bottom of the shell and flows countercurrently to the tube-side fluid inside the shell to achieve heat exchange. One side of the tube block close to the end cover is arranged in an arc shape, and the heat exchange tube fits against the arc surface. When the tube-side fluid enters the heat exchange tube, the smooth arc surface can guide the tube-side fluid into the heat exchange tube, reducing the impact of the tube-side fluid on the tube sheet, thereby reducing the probability of impurity attachment, thus avoiding blockage at the nozzle of the heat exchange tube. The smooth arc surface is not conducive to impurity attachment. The reduction of impurity attachment also reduces the roughness of the tube block and the end of the heat exchange tube during long-term use, thereby increasing the difficulty of scale attachment and further improving the anti-blocking effect during long-term use.

[0013] Furthermore, an upper tube-side pipe is fixedly connected to one side of the end cover away from the support plate, a lower tube-side pipe is fixedly connected to one side of the end cover away from the upper tube-side pipe, an upper shell-side pipe is fixedly connected to one side of the shell away from the support plate, and a lower shell-side pipe is fixedly connected to one side of the shell away from the upper shell-side pipe. The lower shell-side pipe is arranged on the side of the shell away from the end cover. The tube-side fluid is introduced from the upper tube-side pipe and then passes through the heat exchange tube. At the same time, the shell-side medium is introduced from the lower shell-side pipe and enters the interior of the shell. The two flow countercurrently to achieve heat exchange. Then the shell-side fluid leaves the heat exchanger through the lower tube-side pipe, and the tube-side medium leaves the heat exchanger through the upper shell-side pipe.

[0014] Furthermore, a partition is arranged in the middle of the end cover, and the partition is fixedly connected to the inner side surface of the end cover. One side of the partition away from the end cover is fixedly connected to the arc surface of the tube block. The partition is set to separate the end cover and at the same time separate the two ends of each heat exchange tube, so that the tube-side fluid before and after heat exchange is located on both sides of the partition respectively.

[0015] Further, a first baffle is fixedly connected to the inner side surface of the outer shell. A plurality of first baffles are arranged inside the outer shell. On the side of each of the plurality of first baffles away from the end cover, a second baffle is arranged, and the second baffle is fixedly connected to the inner side surface of the outer shell away from the first baffle. The first baffle and the second baffle are inclined towards the side close to the end cover. A plurality of heat exchange tubes penetrate through the plurality of first baffles and the second baffles, and the outer side surface of the heat exchange tube is fixedly connected to the inner side surfaces of the first baffle and the second baffle. By providing the first baffle and the second baffle, the shell-side medium can be baffled, the flow direction of the shell-side fluid can be changed, the fluid can flow in a zigzag manner, the flow velocity of the fluid in the shell side can be increased, the turbulence degree of the fluid can be improved, the convective heat transfer between the fluid and the outer surface of the heat exchange tube can be enhanced, the boundary layer thermal resistance can be reduced, thereby improving the overall heat transfer efficiency of the heat exchanger. The fluid repeatedly crosses the tube bundle in the shell side, prolonging the residence time of the fluid in the shell side, increasing the contact opportunity between the fluid and the heat exchange tube, and further improving the heat transfer effect. Moreover, since the first baffle and the second baffle are inclined, the oblique flow and strong fluid disturbance caused can more effectively wash the surface of the heat exchange tube, reduce the adhesion and deposition of dirt on the tube surface, destroy the favorable conditions for dirt deposition, make it difficult for dirt to form a stable deposition layer on the surface of the heat exchange tube, prolong the cleaning cycle of the equipment, and reduce the maintenance cost.

[0016] Further, the anti-blocking mechanism includes a coarse filter plate. The coarse filter plate is arranged directly below the upper tube-side tube. The surface of the coarse filter plate is slidably connected to the inner side surface of the end cover. The side of the coarse filter plate away from the upper tube-side tube is slidably connected to the side of the partition plate away from the lower tube-side tube. The coarse filter plate is bent towards the side close to the partition plate. The setting of the coarse filter plate can filter large-particle impurities in the tube-side fluid, preventing large-particle impurities from entering the heat exchange tube and causing blockage. The bent coarse filter plate makes the impurities in the fluid fall obliquely towards the coarse filter plate, which can prevent large-particle impurities from directly getting stuck inside the coarse filter plate, thus avoiding the blockage of the filter holes of the coarse filter plate.

[0017] Further, a fine filter plate is fixedly connected to the side of the coarse filter plate close to the outer shell. The surface of the fine filter plate is slidably connected to the inner side surface of the end cover. The side of the fine filter plate away from the coarse filter plate is slidably connected to the surface of the partition plate. The fine filter plate is provided to filter small-particle impurities in the tube-side flow, further preventing the heat exchange tube from being blocked.

[0018] Further, dovetail grooves are symmetrically formed on the side of the partition plate close to the fine filter plate. Sliders are slidably connected to the inner side surfaces of the dovetail grooves. The side of the slider away from the partition plate is fixedly connected to the sides of the coarse filter plate and the fine filter plate close to the partition plate. The dovetail grooves and the sliders are provided so that the coarse filter plate and the fine filter plate can be disassembled, facilitating the cleaning of the inside of the end cover.

[0019] Further, a corner block is provided on the side of the coarse filter plate away from the fine filter plate, and the corner block is fixedly connected to the side of the coarse filter plate away from the partition plate. The corner block is arranged directly below the filter holes of the coarse filter plate. By setting the corner block directly below the filter holes of the coarse filter plate, the tube-side fluid can completely pass through the coarse filter plate, avoiding residue of the tube-side fluid during heat exchange.

[0020] Further, an anti-blocking plate is provided at the interval between the coarse filter plate and the fine filter plate, and the anti-blocking plate is arranged directly above the partition plate. The anti-blocking plate is arranged in a zigzag shape. The setting of the anti-blocking plate can cause an impact with the tube-side fluid, enabling the scale-forming substances in the fluid to adhere to the surface of the anti-blocking plate. Thereby, the solubility of the scale-forming substances in the tube-side fluid entering the heat exchange tubes is reduced, and further the generation of scale in the heat exchange tubes is reduced, avoiding blockage of the heat exchange tubes. Moreover, the anti-blocking plate is arranged at the interval between the coarse filter plate and the fine filter plate, and the fluid at the interval contains a large amount of small particle impurities, which are extremely likely to adhere to the surface of the anti-blocking plate, thus providing conditions for the adhesion of the scale-forming substances and increasing the adhesion of the scale-forming substances on the anti-blocking plate, further avoiding blockage of the heat exchange tubes. At the same time, the anti-blocking plate is arranged in a zigzag shape, which can provide a larger adhesion area within a limited range, further prolonging the time for the heat exchange tubes to become blocked by scale.

[0021] Further, a number of anti-blocking plates are provided, and all the anti-blocking plates are arranged at the intervals between the filter holes of the coarse filter plate. There is a groove on the side of the anti-blocking plate away from the coarse filter plate. The number of anti-blocking plates can further increase the adhesion of the scale-forming substances. And the anti-blocking plates are arranged at the intervals between the filter holes of the coarse filter plate, enabling the tube-side fluid to fully impact the anti-blocking plates, so that the small particle impurities and the scale-forming substances can adhere better. The anti-blocking plates are grooved, which can ensure the smooth passage of the fluid and the small particle impurities.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. By setting the heat exchange mechanism in the present invention, the side of the tube block close to the end cover is set to be arc-shaped, and the heat exchange tubes are in contact with the arc surface. When the tube-side fluid enters the heat exchange tubes, the smooth arc surface can guide the tube-side fluid into the heat exchange tubes, reducing the impact of the tube-side fluid on the tube sheet, thereby reducing the probability of impurity adhesion, and thus avoiding blockage at the nozzle of the heat exchange tubes. The smooth arc surface is not conducive to the adhesion of impurities. The reduction of impurity adhesion also reduces the roughness of the tube block and the end of the heat exchange tubes during long-term use, thereby increasing the difficulty of scale adhesion and further improving the anti-blocking effect during long-term use.

[0024] 2. By providing baffles in the present invention, the first baffle and the second baffle can baffle the shell-side medium, change the flow direction of the shell-side fluid, make the fluid flow tortuously, increase the flow velocity of the fluid in the shell side, improve the turbulence degree of the fluid, enhance the convective heat transfer between the fluid and the outer surface of the heat exchange tubes, reduce the boundary layer thermal resistance, thereby improving the overall heat transfer efficiency of the heat exchanger. The fluid repeatedly sweeps across the tube bundle in the shell side, prolonging the residence time of the fluid in the shell side, increasing the contact opportunity between the fluid and the heat exchange tubes, and further improving the heat transfer effect. Moreover, the first baffle and the second baffle are inclined, causing oblique flow and strong fluid disturbance, which can more effectively scour the surface of the heat exchange tubes, reduce the adhesion and deposition of dirt on the tube surface, destroy the favorable conditions for dirt deposition, making it difficult for dirt to form a stable deposition layer on the surface of the heat exchange tubes, prolonging the cleaning cycle of the equipment and reducing the maintenance cost.

[0025] 3. By providing an anti-blocking mechanism in the present invention, the coarse filter plate can filter large particle impurities in the tube-side fluid, preventing large particle impurities from entering the heat exchange tubes and causing blockage. The bent coarse filter plate makes the impurities in the fluid fall obliquely towards the coarse filter plate, avoiding large particle impurities from directly getting stuck inside the coarse filter plate, thus preventing the filter holes of the coarse filter plate from being blocked. The fine filter plate filters small particle impurities in the tube-side flow, further preventing the heat exchange tubes from being blocked. The dovetail groove and the slider enable the coarse filter plate and the fine filter plate to be disassembled, facilitating the cleaning of the inside of the end cover. The corner block is arranged below the filter holes of the coarse filter plate, enabling the tube-side fluid to completely pass through the coarse filter plate and preventing residual tube-side fluid during heat exchange.

[0026] 4. By providing an anti-blocking plate in the present invention, the anti-blocking plate collides with the tube-side fluid, causing the scale-forming substances in the fluid to adhere to the surface of the anti-blocking plate, thereby reducing the solubility of the scale-forming substances in the tube-side fluid entering the heat exchange tubes, and further reducing the generation of water scale in the heat exchange tubes and preventing the heat exchange tubes from being blocked. Moreover, the anti-blocking plate is arranged at the interval between the coarse filter plate and the fine filter plate. A large amount of small particle impurities are contained in the fluid at the interval, and the small particle impurities are extremely easy to adhere to the surface of the anti-blocking plate, thus providing conditions for the adhesion of the scale-forming substances, increasing the adhesion of the scale-forming substances on the anti-blocking plate, and further preventing the heat exchange tubes from being blocked. At the same time, the anti-blocking plate is arranged in a zigzag shape, which can provide a larger adhesion area within a limited range, further prolonging the time for the heat exchange tubes to be blocked by scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the horizontal shell-and-tube heat exchanger for reducing scale in the present invention;

[0028] Figure 2 Schematic diagram of the cross-sectional structure of the outer shell of the present invention;

[0029] Figure 3 Schematic diagram of the structure of the heat exchange tubes of the present invention;

[0030] Figure 4 Schematic diagram of the baffle structure of the present invention;

[0031] Figure 5 Schematic diagram of the tube block structure of the present invention;

[0032] Figure 6 Schematic diagram of the anti-blocking mechanism structure of the present invention;

[0033] Figure 7 Schematic diagram of the partition plate assembly structure of the present invention;

[0034] Figure 8 Schematic diagram of the anti-blocking plate structure of the present invention.

[0035] In the figure: 1, outer shell; 2, support plate; 3, end cover; 4, upper tube pass tube; 5, lower tube pass tube; 6, upper shell pass tube; 7, lower shell pass tube; 8, heat exchange mechanism; 81, heat exchange tube; 82, tube sheet; 83, tube block; 84, first baffle; 85, second baffle; 9, anti-blocking mechanism; 91, coarse filter plate; 92, slider; 93, dovetail groove; 94, fine filter plate; 95, corner block; 96, anti-blocking plate; 10, partition plate. Detailed implementation manners

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0037] Example 1, please refer to Figures 1 - 5 , the present invention is a horizontal shell-and-tube heat exchanger for reducing fouling, including:

[0038] An outer shell 1, a support plate 2 is fixedly connected to the bottom of the outer shell 1, and an end cover 3 is fixedly connected to the open end of the outer shell 1 by bolts;

[0039] A heat exchange mechanism 8, the heat exchange mechanism 8 is arranged inside the outer shell 1, and the surface of the heat exchange mechanism 8 is fixedly connected to the inner side surface of the outer shell 1;

[0040] An anti-blocking mechanism 9, the anti-blocking mechanism 9 is arranged inside the end cover 3, and the surface of the anti-blocking mechanism 9 is fixedly connected to the inner side surface of the end cover 3;

[0041] Among them, the heat exchange mechanism 8 includes:

[0042] The heat exchange tubes 81 are U-shaped, with both ends of the heat exchange tubes 81 facing the end cover 3. The inner side surface of the outer shell 1 is fixedly connected with a tube sheet 82, and the inner side surface of the tube sheet 82 is fixedly connected with the outer side surface of the heat exchange tubes 81. A number of heat exchange tubes 81 are evenly distributed inside the outer shell 1;

[0043] The tube block 83 is fixedly connected to the side of the tube sheet 82 close to the end cover 3. The outer side surface of the tube block 83 is fixedly connected to the inner side surface of the outer shell 1, and the inner side surface of the tube block 83 is fixedly connected to the outer side surface of the heat exchange tubes 81;

[0044] The side of the tube block 83 close to the end cover 3 is arc-shaped, and the end of the heat exchange tube 81 is in contact with the arc surface of the tube block 83;

[0045] The tube-side fluid enters the heat exchange tubes 81 from the upper half of the end cover 3 and enters the lower half of the end cover 3 along the heat exchange tubes 81. At the same time, the shell-side medium enters from the bottom of the outer shell 1 and flows countercurrently to the tube-side fluid inside the outer shell 1 to achieve heat exchange. The side of the tube block 83 close to the end cover 3 is arc-shaped, and the heat exchange tubes 81 are in contact with the arc surface. When the tube-side fluid enters the heat exchange tubes 81, the smooth arc surface can guide the tube-side fluid into the heat exchange tubes 81, reducing the impact of the tube-side fluid on the tube sheet 82, thereby reducing the probability of impurity adhesion, thus avoiding blockage at the nozzle of the heat exchange tubes 81. The smooth arc surface is not conducive to impurity adhesion. The reduction of impurity adhesion also reduces the roughness of the tube block 83 and the end of the heat exchange tube 81 during long-term use, thereby increasing the difficulty of scale adhesion and further improving the anti-blocking effect during long-term use.

[0046] A upper tube-side tube 4 is fixedly connected to the side of the end cover 3 away from the support plate 2, a lower tube-side tube 5 is fixedly connected to the side of the end cover 3 away from the upper tube-side tube 4, an upper shell-side tube 6 is fixedly connected to the side of the outer shell 1 away from the support plate 2, a lower shell-side tube 7 is fixedly connected to the side of the outer shell 1 away from the upper shell-side tube 6, and the lower shell-side tube 7 is arranged on the side of the outer shell 1 away from the end cover 3. The tube-side fluid is introduced from the upper tube-side tube 4 and then passes through the heat exchange tubes 81. At the same time, the shell-side medium is introduced from the lower shell-side tube 7 and enters the inside of the outer shell 1. The two flow countercurrently to achieve heat exchange. Then the shell-side fluid leaves the heat exchanger through the lower tube-side tube 5, and the tube-side medium leaves the heat exchanger through the upper shell-side tube 6.

[0047] A partition plate 10 is arranged in the middle of the end cover 3, and the partition plate 10 is fixedly connected to the inner side surface of the end cover 3. The side of the partition plate 10 away from the end cover 3 is fixedly connected to the arc surface of the tube block 83. The partition plate 10 is arranged to separate the end cover 3 and at the same time separate the two ends of each heat exchange tube 81, so that the tube-side fluid before and after heat exchange is located on both sides of the partition plate 10 respectively.

[0048] On the inner side of the outer shell 1, a first baffle plate 84 is fixedly connected. There are several first baffle plates 84 arranged inside the outer shell 1. On the side of several first baffle plates 84 away from the end cover 3, a second baffle plate 85 is arranged, and the second baffle plate 85 is fixedly connected to the inner side of the outer shell 1 away from the first baffle plate 84. The first baffle plate 84 and the second baffle plate 85 are inclined towards the side close to the end cover 3. Several heat exchange tubes 81 penetrate through several first baffle plates 84 and the second baffle plate 85, and the outer side surface of the heat exchange tube 81 is fixedly connected to the inner side surfaces of the first baffle plate 84 and the second baffle plate 85. By setting the first baffle plate 84 and the second baffle plate 85, the shell-side medium can be baffled, the flow direction of the shell-side fluid can be changed, so that the fluid flows in a zigzag manner, increasing the flow velocity of the fluid in the shell side, improving the turbulence degree of the fluid, enhancing the convective heat transfer between the fluid and the outer surface of the heat exchange tube 81, reducing the boundary layer thermal resistance, thereby improving the overall heat transfer efficiency of the heat exchanger. The fluid repeatedly crosses the tube bundle in the shell side, prolonging the residence time of the fluid in the shell side, increasing the contact opportunity between the fluid and the heat exchange tube 81, and further improving the heat transfer effect. Moreover, the first baffle plate 84 and the second baffle plate 85 are inclined, causing an oblique flow and stronger fluid disturbance, which can more effectively scour the surface of the heat exchange tube 81, reduce the adhesion and deposition of dirt on the tube surface, destroy the favorable conditions for dirt deposition, making it difficult for dirt to form a stable deposition layer on the surface of the heat exchange tube 81, prolonging the cleaning cycle of the equipment, and reducing the maintenance cost.

[0049] Example 2. Please refer to Figures 1 - 8 , the anti-blocking mechanism 9 includes a coarse filter plate 91. The coarse filter plate 91 is arranged directly below the upper tube-side tube 4. The surface of the coarse filter plate 91 is slidably connected to the inner side surface of the end cover 3. The side of the coarse filter plate 91 away from the upper tube-side tube 4 is slidably connected to the side of the partition plate 10 away from the lower tube-side tube 5. The coarse filter plate 91 is bent towards the side close to the partition plate 10. The setting of the coarse filter plate 91 can filter large particle impurities in the tube-side fluid, preventing large particle impurities from entering the heat exchange tube 81 and causing blockage. The bent coarse filter plate 91 makes the impurities in the fluid fall obliquely towards the coarse filter plate 91, which can prevent large particle impurities from directly getting stuck inside the coarse filter plate 91, thereby avoiding the clogging of the filter holes of the coarse filter plate 91.

[0050] On the side of the coarse filter plate 91 close to the outer shell 1, a fine filter plate 94 is fixedly connected. The surface of the fine filter plate 94 is slidably connected to the inner side surface of the end cover 3. The side of the fine filter plate 94 away from the coarse filter plate 91 is slidably connected to the surface of the partition plate 10. By setting the fine filter plate 94, small particle impurities in the tube-side flow are filtered, further preventing the heat exchange tube 81 from being blocked.

[0051] On one side of the partition plate 10 close to the fine filter plate 94, dovetail grooves 93 are symmetrically arranged. The inner side surface of the dovetail groove 93 is slidably connected with a slider 92. The side of the slider 92 away from the partition plate 10 is fixedly connected with the side of the coarse filter plate 91 and the fine filter plate 94 close to the partition plate 10. The arrangement of the dovetail groove 93 and the slider 92 enables the coarse filter plate 91 and the fine filter plate 94 to be disassembled, facilitating the cleaning of the interior of the end cover 3.

[0052] On the side of the coarse filter plate 91 away from the fine filter plate 94, an angle block 95 is arranged, and the angle block 95 is fixedly connected to the side of the coarse filter plate 91 away from the partition plate 10. The angle block 95 is arranged directly below the filter holes of the coarse filter plate 91. By arranging the angle block 95 directly below the filter holes of the coarse filter plate 91, the tube-side fluid can completely pass through the coarse filter plate 91, avoiding the residue of the tube-side fluid during heat exchange.

[0053] A anti-blocking plate 96 is arranged at the interval between the coarse filter plate 91 and the fine filter plate 94, and the anti-blocking plate 96 is arranged directly above the partition plate 10. The anti-blocking plate 96 is arranged in a zigzag shape. The arrangement of the anti-blocking plate 96 can collide with the tube-side fluid, causing the scale-forming substances in the fluid to adhere to the surface of the anti-blocking plate 96, thereby reducing the solubility of the scale-forming substances in the tube-side fluid entering the heat exchange tube 81, and further reducing the generation of scale in the heat exchange tube 81 and avoiding the blockage of the heat exchange tube 81. Moreover, the anti-blocking plate 96 is arranged at the interval between the coarse filter plate 91 and the fine filter plate 94, and the fluid at the interval contains a large amount of small particle impurities, which are extremely easy to adhere to the surface of the anti-blocking plate 96, thus providing conditions for the adhesion of the scale-forming substances and increasing the adhesion of the scale-forming substances on the anti-blocking plate 96, further avoiding the blockage of the heat exchange tube 81. At the same time, the anti-blocking plate 96 is arranged in a zigzag shape, which can provide a larger adhesion area within a limited range, and further extend the time for the heat exchange tube 81 to generate scale and blockage.

[0054] Several anti-blocking plates 96 are arranged, and several anti-blocking plates 96 are all arranged at the intervals of the filter holes of the coarse filter plate 91. There is a groove on the side of the anti-blocking plate 96 away from the coarse filter plate 91. The several anti-blocking plates 96 can further increase the adhesion of the scale-forming substances, and the anti-blocking plates 96 are arranged at the intervals of the filter holes of the coarse filter plate 91, enabling the tube-side fluid to fully impact the anti-blocking plates 96, so that the small particle impurities and the scale-forming substances can adhere better. The anti-blocking plates 96 are grooved, which can ensure the smooth passage of the fluid and the small particle impurities.

[0055] In use, the tube-side fluid is introduced from the upper tube-side tube 4, enters the end cover 3, and is located above the partition plate 10. Subsequently, it passes through the coarse filter plate 91 and the fine filter plate 94 in sequence. The coarse filter plate 91 filters large particle impurities in the tube-side fluid, and the fine filter plate 94 filters small particle impurities in the tube-side fluid. At the same time, the anti-blocking plate 96 is provided to collide with the tube-side fluid, so that the scale-forming substances in the fluid adhere to the surface of the anti-blocking plate 96, reducing the solubility of the scale-forming substances in the tube-side fluid entering the heat exchange tube 81. Moreover, the small particle impurities in the tube-side fluid adhere to the surface of the anti-blocking plate 96, providing conditions for the adhesion of the scale-forming substances, increasing the adhesion of the scale-forming substances on the anti-blocking plate 96, and further reducing the solubility of the scale-forming substances in the tube-side fluid entering the heat exchange tube 81. Finally, it enters the heat exchange tube 81. At the same time, the shell-side medium is introduced from the lower shell-side tube 7, enters the outer shell 1, and the first baffle plate 84 and the second baffle plate 85 deflect the shell-side medium, changing the flow direction of the shell-side fluid, making the fluid flow in a zigzag manner. The tube-side fluid and the shell-side medium flow in opposite directions to achieve heat exchange. Subsequently, the shell-side fluid leaves the heat exchanger through the lower tube-side tube 5, and the tube-side medium leaves the heat exchanger through the upper shell-side tube 6.

[0056] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art without special instructions and limitations.

Claims

1. A horizontal shell and tube heat exchanger with reduced scaling, characterized in that: include: A housing (1), wherein a support plate (2) is fixedly connected to the bottom of the housing (1), and an end cover (3) is fixedly connected to the open end of the housing (1) via bolts; A heat exchange mechanism (8), the heat exchange mechanism (8) being arranged inside the outer shell (1), and the surface of the heat exchange mechanism (8) being fixedly connected to the inner side surface of the outer shell (1); An anti-blocking mechanism (9), wherein the anti-blocking mechanism (9) is arranged inside the end cover (3), and a surface of the anti-blocking mechanism (9) is fixedly connected to an inner side surface of the end cover (3); Wherein, the heat exchange mechanism (8) comprises: A heat exchange tube (81), wherein the heat exchange tube (81) is arranged in a U shape, both ends of the heat exchange tube (81) face the end cover (3), the inner side surface of the shell (1) is fixedly connected to a tube sheet (82), the inner side surface of the tube sheet (82) is fixedly connected to the outer side surface of the heat exchange tube (81), and a plurality of heat exchange tubes (81) are evenly distributed inside the shell (1); a tube block (83), the tube block (83) being fixedly connected to a side of the tube sheet (82) close to the end cover (3), the outer side surface of the tube block (83) being fixedly connected to the inner side surface of the shell (1), and the inner side surface of the tube block (83) being fixedly connected to the outer side surface of the heat exchange tube (81); A side of the tube block (83) close to the end cover (3) is arranged in an arc shape, and the end of the heat exchange tube (81) is in contact with the arc surface of the tube block (83).

2. A horizontal shell and tube heat exchanger with reduced scaling according to claim 1, characterized in that: The side of the end cover (3) away from the support plate (2) is fixedly connected to an upper tube-side tube (4), the side of the end cover (3) away from the upper tube-side tube (4) is fixedly connected to a lower tube-side tube (5), the side of the outer shell (1) away from the support plate (2) is fixedly connected to an upper shell-side tube (6), the side of the outer shell (1) away from the upper shell-side tube (6) is fixedly connected to a lower shell-side tube (7), and the lower shell-side tube (7) is arranged on a side of the outer shell (1) away from the end cover (3).

3. A horizontal shell and tube heat exchanger with reduced scaling according to claim 2, characterized in that: A partition plate (10) is provided in the middle of the end cover (3), and the partition plate (10) is fixedly connected to the inner side surface of the end cover (3), and the side of the partition plate (10) away from the end cover (3) is fixedly connected to the arc surface of the pipe block (83).

4. A horizontal shell and tube heat exchanger with reduced scaling according to claim 3, characterized in that: The inner side surface of the shell (1) is fixedly connected to a first baffle (84), a plurality of the first baffles (84) are arranged inside the shell (1), a second baffle (85) is arranged on a side of the plurality of the first baffles (84) away from the end cover (3), and the second baffle (85) is fixedly connected to the inner side surface of the shell (1) away from the first baffle (84), the first baffle (84) and the second baffle (85) are inclined toward a side close to the end cover (3), a plurality of the heat exchange tubes (81) pass through the plurality of the first baffles (84) and the second baffles (85), and the outer side surface of the heat exchange tube (81) is fixedly connected to the inner side surfaces of the first baffle (84) and the second baffle (85).

5. A horizontal shell and tube heat exchanger with reduced scaling according to claim 4, characterized in that: The anti-blocking mechanism (9) comprises a coarse filter plate (91), the coarse filter plate (91) being arranged directly below the upper tube-side tube (4), the surface of the coarse filter plate (91) being slidably connected to the inner side surface of the end cover (3), the side of the coarse filter plate (91) away from the upper tube-side tube (4) being slidably connected to the side of the partition plate (10) away from the lower tube-side tube (5), and the coarse filter plate (91) being bent toward the side close to the partition plate (10).

6. A horizontal shell and tube heat exchanger with reduced scaling according to claim 5, characterized in that: A fine filter plate (94) is fixedly connected to a side of the coarse filter plate (91) close to the housing (1); a surface of the fine filter plate (94) is slidably connected to an inner side surface of the end cover (3); and a side of the fine filter plate (94) away from the coarse filter plate (91) is slidably connected to a surface of the partition plate (10).

7. A horizontal shell and tube heat exchanger with reduced scaling according to claim 6, characterized in that: A dovetail groove (93) is symmetrically provided on one side of the partition (10) close to the fine filter plate (94); a slider (92) is slidably connected to the inner side of the dovetail groove (93); and a side of the slider (92) away from the partition (10) is fixedly connected to the coarse filter plate (91) and the side of the fine filter plate (94) close to the partition (10).

8. A horizontal shell and tube heat exchanger with reduced scaling according to claim 7, characterized in that: A corner block (95) is provided on the side of the coarse filter plate (91) away from the fine filter plate (94), and the corner block (95) is fixedly connected to the side of the coarse filter plate (91) away from the partition plate (10), and the corner block (95) is arranged directly below the filter hole of the coarse filter plate (91).

9. A horizontal shell and tube heat exchanger with reduced scaling according to claim 8, characterized in that: An anti-blocking plate (96) is provided at the interval between the coarse filter plate (91) and the fine filter plate (94), and the anti-blocking plate (96) is provided directly above the partition plate (10). The anti-blocking plate (96) is provided in a folded line shape.

10. A horizontal shell and tube heat exchanger with reduced scaling according to claim 9, characterized in that: A plurality of anti-blocking plates (96) are provided, and the plurality of anti-blocking plates (96) are all provided at the filter hole intervals of the coarse filter plate (91), and a groove is provided on one side of the anti-blocking plate (96) away from the coarse filter plate (91).

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