A horizontal tube-in-shell heat exchanger with reduced fouling

Abstract

The application discloses a horizontal shell-and-tube heat exchanger capable of reducing fouling, and relates to the technical field of shell-and-tube heat exchangers.The horizontal shell-and-tube heat exchanger comprises heat exchange pipes, the inner side surface of a shell 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 pipes, the heat exchange pipes are uniformly distributed in the shell, a tube block is fixedly connected with one side of the tube sheet, the inner side surface of the tube block is fixedly connected with the outer side surface of the heat exchange pipes, the side of the tube block close to an end cover is provided with an arc shape, and the end of the heat exchange pipe is attached to the arc surface of the tube block.When the pipe-side fluid enters the heat exchange pipe, the smooth arc surface can guide the pipe-side fluid to enter the heat exchange pipe, reduce the impact of the pipe-side fluid on the tube sheet, reduce the probability of impurity adhesion, avoid the pipe opening of the heat exchange pipe from being blocked, reduce the roughness of the tube block and the end of the heat exchange pipe during long-time use, and improve the adhesion difficulty of water scale.

Description

Technical Field

[0001] The invention relates to the technical field of shell and tube heat exchangers, and in particular to a horizontal shell and tube heat exchanger capable of reducing scaling. Background Art

[0002] The horizontal shell and tube heat exchanger is a partitioned wall heat exchanger that uses the wall of the tube bundle in a closed shell as the heat transfer surface. It is mainly composed of a shell, a tube bundle, a tube sheet and a head. The shell is circular and contains parallel tube bundles. The two ends of the tube bundle are fixed to the tube sheet. The two fluids that exchange heat in it, one flows inside the tube, and its stroke is called the tube side, and the other flows outside the tube, and its stroke is called the shell side. In order to improve the heat transfer coefficient of the fluid outside the tube, a certain number of transverse baffles are usually installed in the shell to make the fluid flow through the tube bundle multiple times along the specified path, increase the fluid velocity and improve the turbulence level. It has the advantages of simple structure, low cost, high temperature and high pressure resistance, mature manufacturing process, strong adaptability, and a wide range of material selection. It is widely used in industrial fields such as chemical industry, petroleum, refrigeration, nuclear energy and power.

[0003] When a heat exchanger is working, the solubility of scaling substances in the internal tube fluid will change significantly due to temperature changes, which can easily cause scale to form, affecting the heat transfer efficiency of the heat exchange tube and even causing blockage. When processing some tube fluids containing impurities, the fluid needs to be filtered to prevent impurities from adhering to the tube and providing attachment points for scale. Therefore, we have proposed a horizontal shell and tube heat exchanger that reduces scaling. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a horizontal shell and tube heat exchanger with reduced scaling, comprising:

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

[0006] a heat exchange mechanism, the heat exchange mechanism being disposed inside the housing, and a surface of the heat exchange mechanism being fixedly connected to an inner side surface of the housing;

[0007] An anti-blocking mechanism is disposed inside the end cover, and a surface of the anti-blocking mechanism is fixedly connected to an inner side surface of the end cover;

[0008] Wherein, the heat exchange mechanism includes:

[0009] The heat exchange tube is arranged in a U shape, with both ends of the heat exchange tube facing the end caps, the inner side of the shell is fixedly connected to a tube sheet, the inner side of the tube sheet is fixedly connected to the outer side of the heat exchange tube, and a plurality of heat exchange tubes are evenly distributed inside the shell;

[0010] A tube block, wherein the tube block is fixedly connected to a side of the tube sheet close to the end cover, the outer side of the tube block is fixedly connected to the inner side of the shell, and the inner side of the tube block is fixedly connected to the outer side of the heat exchange tube;

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

[0012] The tube-side fluid enters the heat exchange tube from the upper part of the end cover and enters the lower part of the end cover along the heat exchange tube. At the same time, the shell-side medium enters from the bottom of the shell and flows in the opposite direction to the tube-side fluid inside the shell to achieve heat exchange. The side of the tube block close to the end cover is set to be arc-shaped, and the heat exchange tube fits 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 collision between the tube-side fluid and the tube sheet, thereby reducing the probability of impurity adhesion, thereby avoiding blockage at the tube mouth of the heat exchange tube. The smooth arc surface is not conducive to the adhesion of impurities. The reduction in impurity adhesion 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 adhesion and further improving the anti-blocking effect during long-term use.

[0013] Furthermore, the side of the end cover away from the support plate is fixedly connected to the upper tube-side tube, the side of the end cover away from the upper tube-side tube is fixedly connected to the lower tube-side tube, the side of the shell away from the support plate is fixedly connected to the upper shell-side tube, the side of the shell away from the upper shell-side tube is fixedly connected to the lower shell-side tube, and the lower shell-side tube is arranged on the side of the shell away from the end cover, the tube-side fluid enters from the upper tube-side tube and then passes through the heat exchange tube, and at the same time the shell-side medium enters from the lower shell-side tube and enters the interior of the shell, the two flow in reverse directions to achieve heat exchange, and then the shell-side fluid leaves the heat exchanger through the lower tube-side tube, and the tube-side medium leaves the heat exchanger through the upper shell-side tube.

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

[0015] Furthermore, the inner side surface of the shell is fixedly connected with a first baffle, and several first baffles are arranged inside the shell, and several first baffles are provided with second baffles on the side away from the end cover, and the second baffles are fixedly connected to the inner side surface of the shell away from the first baffle, and the first baffle and the second baffle are inclined toward the side close to the end cover, and several heat exchange tubes pass through several first baffles and second baffles, and the outer side surfaces of the heat exchange tubes are fixedly connected to the inner side surfaces of the first baffle and the second baffle, and the first baffle and the second baffle are arranged to baffle the shell-side medium, change the flow direction of the shell-side fluid, make the fluid flow in a zigzag manner, and increase the heat exchange rate. Increasing the flow rate of the fluid in the shell side, improving the turbulence of the fluid, enhancing the convective heat transfer between the fluid and the outer surface of the heat exchange tube, reducing the boundary layer thermal resistance, thereby improving the overall heat transfer efficiency of the heat exchanger, and making the fluid repeatedly cross the tube bundle in the shell side, extending the residence time of the fluid in the shell side, increasing the contact opportunity between the fluid and the heat exchange tube, and thus improving the heat transfer effect. The first baffle and the second baffle are inclined, and the oblique flow and strong fluid disturbance caused by the inclined setting can more effectively flush the surface of the heat exchange tube, reduce the attachment and deposition of dirt on the tube surface, destroy the favorable conditions for dirt deposition, and make it difficult for dirt to form a stable deposition layer on the surface of the heat exchange tube, thereby extending the cleaning cycle of the equipment and reducing maintenance costs.

[0016] Furthermore, the anti-blocking mechanism includes a coarse filter plate, which is arranged just 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 away from the lower tube-side tube. The coarse filter plate is bent toward the side close to the partition. The setting of the coarse filter plate can filter large particles of impurities in the tube-side fluid to prevent large particles of impurities from entering the heat exchange tube and causing blockage. The bent coarse filter plate allows impurities in the fluid to fall obliquely toward the coarse filter plate, which can prevent large particles of impurities from directly getting stuck in the coarse filter plate, thereby preventing the filter holes of the coarse filter plate from being blocked.

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

[0018] Furthermore, a dovetail groove is symmetrically provided on one side of the partition close to the fine filter plate, and a slider is slidably connected to the inner side of the dovetail groove. The side of the slider away from the partition is fixedly connected to the coarse filter plate and the side of the fine filter plate close to the partition. The dovetail groove and the slider are provided so that the coarse filter plate and the fine filter plate can be disassembled, which is convenient for cleaning the inside of the end cover.

[0019] Furthermore, 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, and the corner block is arranged directly below the filter hole of the coarse filter plate. The corner block is provided, and the corner block is arranged below the filter hole of the coarse filter plate, so that the tube-side fluid can completely pass through the coarse filter plate, thereby avoiding the generation of residual tube-side fluid during heat exchange.

[0020] Furthermore, 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 provided directly above the partition plate, and the anti-blocking plate is provided in a broken line shape. The setting of the anti-blocking plate can collide with the tube-side fluid, so that the scaling substances in the fluid adhere to the surface of the anti-blocking plate, thereby reducing the solubility of scaling substances in the tube-side fluid entering the heat exchange tube, thereby reducing the generation of scale in the heat exchange tube and avoiding blockage of the heat exchange tube. The anti-blocking plate is provided at the interval between the coarse filter plate and the fine filter plate. The fluid at the interval contains a large amount of small particle impurities, and the small particle impurities are very easy to adhere to the surface of the anti-blocking plate, thereby providing conditions for the attachment of scaling substances, increasing the attachment of scaling substances to the anti-blocking plate, and further avoiding blockage of the heat exchange tube. At the same time, the anti-blocking plate is provided in a broken line shape, which can provide a larger attachment area within a limited range, and further prolong the time for scaling and blockage of the heat exchange tube.

[0021] Furthermore, there are several anti-blocking plates, and the several anti-blocking plates are all arranged at the filter hole intervals of the coarse filter plate. The anti-blocking plate has a groove on the side away from the coarse filter plate. The several anti-blocking plates can further increase the adhesion of scaling substances, and the anti-blocking plates are arranged at the filter hole intervals of the coarse filter plate, so that the pipe-side fluid can fully impact the anti-blocking plates, so that small particles of impurities and scaling substances can be better attached. The anti-blocking plates are grooved to ensure the smooth passage of fluid and small particles of impurities.

[0022] The present invention has the beneficial effects:

[0023] 1. The present invention provides a heat exchange mechanism, wherein one side of the tube block close to the end cover is configured to be arc-shaped, and the heat exchange tube is in contact with the arc-shaped surface. When the tube-side fluid enters the heat exchange tube, the smooth arc-shaped surface can guide the tube-side fluid into the heat exchange tube, reducing the collision between the tube-side fluid and the tube sheet, thereby reducing the probability of impurities adhering to the tube, thereby avoiding blockage at the tube mouth of the heat exchange tube. The smooth arc-shaped surface is not conducive to the adhesion of impurities. The reduced adhesion of impurities 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 adhesion and further improving the anti-blocking effect during long-term use.

[0024] 2. The present invention sets baffles, and 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 in a zigzag manner, increase the flow velocity of the fluid in the shell, increase the turbulence of the fluid, enhance the convective heat transfer between the fluid and the outer surface of the heat exchange tube, reduce the boundary layer thermal resistance, thereby improving the overall heat transfer efficiency of the heat exchanger, making the fluid repeatedly cross the tube bundle in the shell, extending the residence time of the fluid in the shell, increasing the contact opportunity between the fluid and the heat exchange tube, and thus improving the heat transfer effect. The first baffle and the second baffle are set at an angle, and the resulting oblique flow and strong fluid disturbance can more effectively flush 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, and make it difficult for dirt to form a stable deposition layer on the surface of the heat exchange tube, thereby extending the cleaning cycle of the equipment and reducing maintenance costs.

[0025] 3. The present invention provides an anti-blocking mechanism. The coarse filter plate can filter large particles of impurities in the tube-side fluid to prevent large particles of impurities from entering the heat exchange tube and causing blockage. The curved coarse filter plate allows impurities in the fluid to fall obliquely toward the coarse filter plate, which can prevent large particles of impurities from directly getting stuck in the coarse filter plate, thereby preventing the filter holes of the coarse filter plate from being blocked. The fine filter plate filters small particles of impurities in the tube-side flow to further prevent the heat exchange tube from being blocked. The dovetail groove and the slider allow the coarse filter plate and the fine filter plate to be disassembled, which is convenient for cleaning the inside of the end cover. The corner block is provided below the filter hole of the coarse filter plate, so that the tube-side fluid can completely pass through the coarse filter plate, avoiding the generation of residual tube-side fluid during heat exchange.

[0026] 4. The present invention sets an anti-blocking plate to collide with the tube-side fluid, so that the substances in the fluid that are prone to scaling adhere to the surface of the anti-blocking plate, thereby reducing the solubility of scaling substances in the tube-side fluid entering the heat exchange tube, and further reducing the generation of scale in the heat exchange tube, avoiding blockage of the heat exchange tube, and the anti-blocking plate is set at the gap between the coarse filter plate and the fine filter plate. The fluid in the gap contains a large amount of small particle impurities, and the small particle impurities are very easy to adhere to the surface of the anti-blocking plate, thereby providing conditions for the attachment of scaling substances, increasing the attachment of scaling substances to the anti-blocking plate, and further avoiding blockage of the heat exchange tube. At the same time, the anti-blocking plate is set in a broken line shape, which can provide a larger attachment area within a limited range, and further prolong the time for scaling and blockage of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a horizontal shell and tube heat exchanger for reducing scaling according to the present invention;

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the housing of the present invention;

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

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

[0031] Figure 5 This is a schematic diagram of the pipe block structure of the present invention;

[0032] Figure 6 This is a schematic structural diagram of the anti-blocking mechanism of the present invention;

[0033] Figure 7 This is a schematic diagram of the partition assembly structure of the present invention;

[0034] Figure 8 This is a schematic structural diagram of the anti-blocking plate of the present invention.

[0035] In the figure: 1. outer shell; 2. support plate; 3. end cover; 4. upper tube-side tube; 5. lower tube-side tube; 6. upper shell-side tube; 7. lower shell-side 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. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0037] Example 1, please refer to Figure 1-Figure 5 The present invention is a horizontal shell and tube heat exchanger with reduced scaling, comprising:

[0038] The housing 1 has a support plate 2 fixedly connected to the bottom thereof, and an end cover 3 fixedly connected to the open end thereof by bolts;

[0039] The heat exchange mechanism 8 is disposed inside the housing 1 , and the surface of the heat exchange mechanism 8 is fixedly connected to the inner side surface of the housing 1 ;

[0040] 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 of the end cover 3;

[0041] The heat exchange mechanism 8 includes:

[0042] Heat exchange tube 81, the heat exchange tube 81 is set to U shape, both ends of the heat exchange tube 81 face the end cover 3, the inner side of the shell 1 is fixedly connected to the tube sheet 82, the inner side of the tube sheet 82 is fixedly connected to the outer side of the heat exchange tube 81, and a plurality of heat exchange tubes 81 are evenly distributed inside the 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 of the tube block 83 is fixedly connected to the inner side of the shell 1, and the inner side of the tube block 83 is fixedly connected to the outer side of the heat exchange tube 81.

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

[0045] The tube-side fluid enters the heat exchange tube 81 from the upper half of the end cover 3 and enters the lower half of the end cover 3 along the heat exchange tube 81. At the same time, the shell-side medium enters from the bottom of the shell 1 and flows in the opposite direction to the tube-side fluid inside the shell 1 to achieve heat exchange. The side of the tube block 83 close to the end cover 3 is set to be arc-shaped, and the heat exchange tube 81 fits the arc surface. When the tube-side fluid enters the heat exchange tube 81, the smooth arc surface can guide the tube-side fluid into the heat exchange tube 81, reducing the collision between the tube-side fluid and the tube sheet 82, thereby reducing the probability of impurity adhesion, thereby avoiding blockage at the tube mouth of the heat exchange tube 81. The smooth arc surface is not conducive to the adhesion of impurities. The reduction in 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] The side of the end cover 3 away from the support plate 2 is fixedly connected to the upper tube-side tube 4, the side of the end cover 3 away from the upper tube-side tube 4 is fixedly connected to the lower tube-side tube 5, the side of the shell 1 away from the support plate 2 is fixedly connected to the upper shell-side tube 6, the side of the shell 1 away from the upper shell-side tube 6 is fixedly connected to the lower shell-side tube 7, and the lower shell-side tube 7 is arranged on the side of the shell 1 away from the end cover 3. The tube-side fluid enters from the upper tube-side tube 4 and then passes through the heat exchange tube 81. At the same time, the shell-side medium enters from the lower shell-side tube 7 and enters the interior of the shell 1. The two flow in opposite directions 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 10 is provided in the middle of the end cover 3, and the partition 10 is fixedly connected to the inner side surface of the end cover 3. The side of the partition 10 away from the end cover 3 is fixedly connected to the arcuate surface of the tube block 83. The partition 10 is provided 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 fluids before and after heat exchange are respectively located on both sides of the partition 10.

[0048] The inner side of the shell 1 is fixedly connected with a first baffle 84, and a plurality of first baffles 84 are provided inside the shell 1. A second baffle 85 is provided on the side of the plurality of first baffles 84 away from the end cover 3, and the second baffle 85 is fixedly connected to the inner side of the shell 1 away from the first baffle 84. The first baffle 84 and the second baffle 85 are inclined toward the side close to the end cover 3. A plurality of heat exchange tubes 81 pass through the plurality of first baffles 84 and the second baffle 85, and the outer side of the heat exchange tube 81 is fixedly connected to the inner side of the first baffle 84 and the second baffle 85. The first baffle 84 and the second baffle 85 are provided to baffle the shell-side medium, change the flow direction of the shell-side fluid, and make the fluid flow in a zigzag manner. The movement increases the flow velocity of the fluid in the shell side, increases the turbulence of the fluid, enhances the convective heat transfer between the fluid and the outer surface of the heat exchange tube 81, reduces the boundary layer thermal resistance, and thus improves the overall heat transfer efficiency of the heat exchanger, so that the fluid repeatedly crosses the tube bundle in the shell side, prolongs the residence time of the fluid in the shell side, increases the contact opportunity between the fluid and the heat exchange tube 81, and thus improves the heat transfer effect. The first deflector 84 and the second deflector 85 are tilted, and the oblique flow and strong fluid disturbance caused by the tilted arrangement can more effectively flush 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, and make it difficult for dirt to form a stable deposition layer on the surface of the heat exchange tube 81, thereby extending the cleaning cycle of the equipment and reducing maintenance costs.

[0049] Example 2, please refer to Figures 1-8 The anti-blocking mechanism 9 includes a coarse filter plate 91, which is arranged just below the upper tube-side tube 4. The surface of the coarse filter plate 91 is slidably connected to the inner side 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 10 away from the lower tube-side tube 5. The coarse filter plate 91 is bent toward the side close to the partition 10. The setting of the coarse filter plate 91 can filter large particles of impurities in the tube-side fluid and prevent large particles of 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 toward the coarse filter plate 91, which can prevent large particles of impurities from being directly stuck in the coarse filter plate 91, thereby preventing the filter holes of the coarse filter plate 91 from being blocked.

[0050] A fine filter plate 94 is fixedly connected to the side of the coarse filter plate 91 close to the outer shell 1, and the surface of the fine filter plate 94 is slidably connected to the inner side 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 10. The fine filter plate 94 is provided to filter small particles of impurities in the pipe flow, further preventing the heat exchange tube 81 from being blocked.

[0051] A dovetail groove 93 is symmetrically provided on one side of the partition 10 close to the fine filter plate 94, and a slider 92 is slidably connected to the inner side of the dovetail groove 93. The 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. The dovetail groove 93 and the slider 92 are provided so that the coarse filter plate 91 and the fine filter plate 94 can be disassembled, which is convenient for cleaning the inside of the end cover 3.

[0052] 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 10. The corner block 95 is arranged directly below the filter hole of the coarse filter plate 91. The corner block 95 is arranged, and the corner block 95 is arranged below the filter hole of the coarse filter plate 91, so that the tube-side fluid can completely pass through the coarse filter plate 91, thereby avoiding the generation of residual tube-side fluid during heat exchange.

[0053] The 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 just above the partition plate 10. The anti-blocking plate 96 is provided in a broken line shape. The setting of the anti-blocking plate 96 can collide with the tube-side fluid, causing the scaling substances in the fluid to adhere to the surface of the anti-blocking plate 96, thereby reducing the solubility of the scaling substances in the tube-side fluid entering the heat exchange tube 81, thereby reducing the generation of scale in the heat exchange tube 81 and avoiding the blockage of the heat exchange tube 81. The anti-blocking plate 96 is provided at the interval between the coarse filter plate 91 and the fine filter plate 94. The fluid in the interval contains a large amount of small particles of impurities, which are very easy to adhere to the surface of the anti-blocking plate 96, thereby providing conditions for the attachment of scaling substances, increasing the attachment of scaling substances to the anti-blocking plate 96, and further avoiding the blockage of the heat exchange tube 81. At the same time, the anti-blocking plate 96 is provided in a broken line shape, which can provide a larger attachment area within a limited range, further prolonging the time for scaling and blockage of the heat exchange tube 81.

[0054] There are several anti-blocking plates 96, and several anti-blocking plates 96 are arranged at the filter hole intervals of the coarse filter plate 91. The anti-blocking plates 96 have grooves on the side away from the coarse filter plate 91. Several anti-blocking plates 96 can further increase the adhesion of scaling substances, and the anti-blocking plates 96 are arranged at the filter hole intervals of the coarse filter plate 91, so that the pipe-side fluid can fully impact the anti-blocking plates 96, so that small particles of impurities and scaling substances can be better attached. The anti-blocking plates 96 are grooved to ensure the smooth passage of fluid and small particles of impurities.

[0055] During use, the tube-side fluid enters from the upper tube-side tube 4, enters the end cover 3, and is located above the partition 10, and then passes through the coarse filter plate 91 and the fine filter plate 94 in sequence. The coarse filter plate 91 filters the large particles of impurities in the tube-side fluid, and the fine filter plate 94 filters the small particles of impurities in the tube-side flow. At the same time, the setting of the anti-blocking plate 96 collides with the tube-side fluid, so that the substances that are easy to scale in the fluid adhere to the surface of the anti-blocking plate 96, reducing the solubility of the scaling substances in the tube-side fluid entering the heat exchange tube 81, and the small particles of impurities in the tube-side fluid adhere to the surface of the anti-blocking plate 96, which are scaling substances. The first baffle 84 and the second baffle 85 provide conditions for the adhesion of the fouling substances, increase the adhesion of the fouling substances on the anti-blocking plate 96, further reduce the solubility of the fouling substances in the tube-side fluid entering the heat exchange tube 81, and finally enter the heat exchange tube 81. At the same time, the shell-side medium enters from the lower shell-side tube 7 and enters the interior of the shell 1. The first baffle 84 and the second baffle 85 baffle the shell-side medium, change the flow direction of the shell-side fluid, and make the fluid flow in a tortuous manner. The tube-side fluid and the shell-side medium flow in the opposite direction 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.

[0056] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

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 housing (1), and the surface of the heat exchange mechanism (8) being fixedly connected to the inner side surface of the housing (1); an anti-blocking mechanism (9), the anti-blocking mechanism (9) being arranged inside the end cover (3), and the surface of the anti-blocking mechanism (9) being fixedly connected to the 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 configured to be U-shaped, 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), wherein the tube block (83) is 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) is fixedly connected to the inner side surface of the shell (1), and the inner side surface of the tube block (83) is 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 configured as an arcuate surface, and the end of the heat exchange tube (81) is in contact with the arcuate surface of the tube block (83); The anti-blocking mechanism (9) includes a coarse filter plate (91), which 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 toward the side close to the partition plate (10). A fine filter plate (94) is fixedly connected to the side of the coarse filter plate (91) close to the housing (1). 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). A dovetail groove (93) is symmetrically provided on one side of the partition (10) close to the fine filter plate (94), and a slider (92) is slidably connected to the inner side of the dovetail groove (93), and the 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); 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 (10), and the corner block (95) is provided directly below the filter hole of the coarse filter plate (91); 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 just above the partition plate (10). The anti-blocking plate (96) is provided in a broken line shape. A plurality of anti-blocking plates (96) are provided, and the plurality of anti-blocking plates (96) are all provided at the interval between the filter holes of the coarse filter plate (91). A groove is provided on the side of the anti-blocking plate (96) away from the coarse filter plate (91).

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 the upper tube-side tube (4), the side of the end cover (3) away from the upper tube-side tube (4) is fixedly connected to the lower tube-side tube (5), the side of the housing (1) away from the support plate (2) is fixedly connected to the upper shell-side tube (6), the side of the housing (1) away from the upper shell-side tube (6) is fixedly connected to the lower shell-side tube (7), and the lower shell-side tube (7) is arranged on the side of the housing (1) away from the end cover (3).

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

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