Pipe heat exchanger for chemical industry

Abstract

The application relates to the technical field of heat exchangers, and discloses a tubular heat exchanger for chemical engineering, which comprises a connecting shell and a heat exchange mechanism, a pipe body is fixed on one side of the connecting shell through bolts, the heat exchange mechanism comprises a heat exchange tube bundle located in the pipe body; further comprising: a cleaning mechanism arranged at the middle part of the pipe body, the cleaning mechanism comprises a plurality of installation pipes connected head to tail, a piston rod is arranged in the cavity of the installation pipe, a first pipe opening and a second pipe opening are respectively arranged on the surface of the piston rod, and materials enter and exit the installation pipe cavity through the first pipe opening and the second pipe opening; a pushing mechanism is arranged at the middle part of the connecting shell. By injecting acidic or alkaline cleaning materials into the pipe body, full-range immersion descaling treatment of the pipe body and the heat exchange tube bundle is realized, and the cleaning of the inner wall dirt of the heat exchanger is simpler and more convenient.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to a tubular heat exchanger for chemical applications. Background Technology

[0002] Tubular heat exchangers are the most widely used heat exchange equipment in chemical production. Their core structure consists of a cylindrical shell containing many parallel metal tubes (i.e., tube bundles), using the tube walls as heat transfer surfaces to allow two fluids at different temperatures to exchange heat through the tube walls.

[0003] In the prior art, during the heat exchange process of materials, scale and other deposits will accumulate inside the heat exchanger, affecting the subsequent heat exchange efficiency. A tubular heat exchanger with publication number CN223470531U has a cleaning and scraping mechanism designed to remove dirt and scale from the inside of the heat exchange tube when water dirt adheres to the inside of the heat exchange tube or scale is frequently generated by heating. The end cap of the tube shell is removed, and the connecting ring is pulled by hand to drive the connecting push rod to move the control slider inside the control groove. The cleaning scraper ring slides inside the heat exchange tube to scrape away the dirt and scale on the inner surface of the heat exchange tube until the cleaned dirt is discharged to the outside. Although the above technical solutions can clean scale and other deposits inside the heat exchanger, the cleaning process requires disassembling the heat exchanger end caps and then cleaning manually, which is quite cumbersome. Furthermore, the scraper ring is not effective at cleaning the tube bundle, and the impact on heat exchange efficiency is mainly due to the poor thermal conductivity of the tube bundle.

[0004] In response to the existing problems, there is an urgent need to innovate on the existing basis. Summary of the Invention

[0005] The purpose of this invention is to provide a tubular heat exchanger for chemical applications, which solves the problem mentioned in the background art that the cleaning process requires disassembling the heat exchanger end caps and then manually cleaning, making the cleaning operation cumbersome, and the scraper ring is difficult to clean the tube bundle effectively.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tubular heat exchanger for chemical applications, comprising a connecting shell and a heat exchange mechanism, wherein a tube body is bolted to one side of the connecting shell, and the heat exchange mechanism includes a heat exchange tube bundle located inside the tube body; further comprising: A cleaning mechanism is located in the middle of the tube body. The cleaning mechanism includes several installation tubes connected end to end. A piston rod is installed in the cavity of the installation tube, and a first pipe port and a second pipe port are respectively installed on its surface. The material enters and exits the cavity of the installation tube through the first pipe port and the second pipe port. The pushing mechanism is located in the middle of the connecting shell. The pushing mechanism includes a storage shell and a piston rod located in the cavity of the storage shell. The end of the piston rod extends out of the storage shell and is connected to the piston rod. A first pipeline and a second pipeline are respectively installed on the mounting tube. Hydraulic oil enters the storage shell from the first pipeline and drives the piston rod to move forward. The mounting tube sucks up the material. Hydraulic oil enters the storage shell from the second pipeline and drives the piston rod to move in the opposite direction. The mounting tube expels the material to flush and clean the heat exchange tube bundle.

[0007] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, the tube body is respectively equipped with a feed pipe and a discharge pipe, and the material flows into the tube body from the feed pipe and flows out from the discharge pipe.

[0008] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, the heat exchange mechanism further includes a partition plate that divides the internal space of the connecting shell. The upper and lower outer surfaces of the connecting shell are respectively equipped with an outlet pipe and an inlet pipe. A plurality of flow-blocking baffles are installed inside the tube body. The baffles are fitted over the outside of the heat exchange tube bundle. The heat exchange medium flows into the heat exchange tube bundle through the inlet pipe and flows out from the outlet pipe.

[0009] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, the cleaning mechanism further includes a first through pipe and a second port opened inside the installation pipe, the ends of the first through pipe and the second port being connected to the inner cavity of the installation pipe respectively, the first port being connected to the first through pipe, and the second port being connected to the second through pipe.

[0010] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, the first and second through pipes are both spirally arranged, and there is a height difference between the first and second through pipes. The first and second pipe openings are evenly distributed along the trajectory of the first and second through pipes, respectively, thereby improving the scouring and cleaning range.

[0011] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, the installation pipe is further equipped with a suction mechanism, which includes a gas guide pipe. Both ends of the gas guide pipe extend into the installation pipe and communicate with its internal cavity. One-way valves that restrict gas flow are also installed at both ends of the gas guide pipe.

[0012] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, the installation pipe is further provided with a connecting pipe that communicates with the end of the gas guide pipe, so that the gas guide pipes on two adjacent sets of installation pipes are connected through the connecting pipe. A connecting pipe is installed between the storage shell and the installation pipe. An air inlet pipe with its end extending out of the connecting shell is provided on the storage shell. The air inlet pipe is connected to the connecting pipe through the connecting pipe, so that the external gas finally enters the cavity of the installation pipe through the gas guide pipe.

[0013] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, an adjustment mechanism is installed in both the first and second pipe openings. The adjustment mechanism includes a connecting cavity and a sealing block located inside the connecting cavity. A sliding rod that restricts the movement of the sealing block passes through its interior, and springs are installed on both sides of the sealing block to restrict the movement of the sealing block and to generate resistance to the material flow in the first and second pipe openings, thereby improving the uniformity of material spraying in the first and second pipe openings.

[0014] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, a driving mechanism is installed on the outer wall of the connecting shell. The driving mechanism includes an installation shell fixed to the connecting shell and a worm gear disk fixed to the outside of the storage shell. A crossbar is fixed between the storage shell and the installation tube. Rotating the worm gear disk drives the installation tube to rotate and changes the positions of the first and second pipe openings, thereby changing the flushing and cleaning position.

[0015] As an optional embodiment of the tubular heat exchanger for chemical use described in this invention, a drive motor is installed at the bottom of the mounting housing, the output end of the drive motor extends into the interior of the mounting housing and is fixed to the worm gear, and the worm gear meshes with the worm wheel for transmission; a partition is installed inside the storage housing to restrict the movement of the piston push rod.

[0016] The present invention has the following beneficial effects:

[0017] 1. This chemical tube heat exchanger achieves full-range immersion descaling of the tube body and heat exchange tube bundle by injecting acid or alkaline cleaning materials into the tube body, making the cleaning of the inner wall of the heat exchanger simpler and more convenient.

[0018] 2. This chemical tubular heat exchanger utilizes the forward and reverse motion of the piston rod to generate suction negative pressure and extrusion force at both ends of the storage shell, respectively. This allows the cleaning material to be drawn in at one end of the storage shell and extruded at the other end, thus flushing and cleaning the tube body and heat exchange tube bundle, improving both the descaling effect and cleaning efficiency.

[0019] 3. This chemical tubular heat exchanger simultaneously draws in gas during the process of absorbing the cleaning material, resulting in the presence of both gas and liquid in the storage shell. The two phases of gas and liquid are ejected from the storage shell, generating a large number of cavitation bubbles. These bubbles generate shock waves and extremely high-velocity micro-jet streams in micro-local areas, thereby impacting the dirt at a high frequency and improving the cleaning effect. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the connection structure between the partition plate and the heat exchange tube bundle of the present invention.

[0023] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0024] Figure 5 This is a schematic cross-sectional view of the storage housing structure of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the cleaning mechanism of the present invention.

[0026] Figure 7 This is a cross-sectional structural diagram of the cleaning mechanism of the present invention.

[0027] Figure 8 This is a schematic diagram showing the position and structure of the first and second through pipes of the present invention.

[0028] Figure 9 For the present invention Figure 7 Enlarged structural diagram at point B.

[0029] Figure 10 This is a schematic diagram of the connection structure of the multiple cleaning mechanisms of the present invention.

[0030] Figure 11 For the present invention Figure 10 Enlarged structural diagram at point C.

[0031] Figure 12 For the present invention Figure 10 Enlarged structural diagram at point D.

[0032] In the diagram: 101. Connecting shell; 102. Tube body; 103. Feed pipe; 104. Discharge pipe; 2. Heat exchange mechanism; 201. Liquid inlet pipe; 202. Divider plate; 203. Heat exchange tube bundle; 204. Baffle plate; 205. Liquid outlet pipe; 3. Drive mechanism; 301. Mounting shell; 302. Drive motor; 303. Worm gear; 304. Worm wheel; 4. Pushing mechanism; 401. Storage shell; 402. Piston push rod; 403. Partition plate; 404. First tube 405. Second pipeline; 5. Cleaning mechanism; 501. Installation pipe; 502. Piston rod; 503. Crossbar; 504. First port; 505. First through pipe; 506. Second port; 507. Second through pipe; 6. Suction mechanism; 601. Air guide pipe; 602. One-way valve; 603. Connecting pipe; 604. Connecting pipe; 605. Inlet pipe; 7. Adjusting mechanism; 701. Connecting cavity; 702. Slide rod; 703. Sealing block; 704. Spring. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1, please refer to Figures 1 to 12 A tubular heat exchanger for chemical applications includes a connecting shell 101 and a heat exchange mechanism 2. A tube body 102 is bolted to one side of the connecting shell 101. The heat exchange mechanism 2 includes a heat exchange tube bundle 203 located inside the tube body 102. It also includes: The cleaning mechanism 5 is located in the middle of the pipe body 102. The cleaning mechanism 5 includes several installation pipes 501 connected end to end. A piston rod 502 is installed in the cavity of the installation pipe 501, and a first pipe port 504 and a second pipe port 506 are respectively installed on its surface. The material enters and exits the cavity of the installation pipe 501 through the first pipe port 504 and the second pipe port 506. The pushing mechanism 4 is located in the middle of the connecting shell 101. The pushing mechanism 4 includes a storage shell 401 and a piston rod 402 located in the cavity of the storage shell 401. The end of the piston rod 402 extends out of the storage shell 401 and is connected to the piston rod 502. A first pipe 404 and a second pipe 405 are respectively installed on the mounting pipe 501. Hydraulic oil enters the storage shell 401 from the first pipe 404 and drives the piston rod 502 to move forward. The mounting pipe 501 sucks up the material. Hydraulic oil enters the storage shell 401 from the second pipe 405 and drives the piston rod 402 to move in the opposite direction. The mounting pipe 501 expels the material to flush and clean the heat exchange tube bundle 203. By feeding material into the interior of the tube body 102, and utilizing the heat exchange tube bundle 203 inside the tube body 102 (which consists of multiple sets of bent metal tubes and contains a heat exchange medium), heat exchange occurs when the material comes into contact with the heat exchange tube bundle 203 inside the tube body 102. After heat exchange, the material flows out from the feed pipe 103. During long-term use of the heat exchanger, fouling easily accumulates inside the tube body 102 and on the heat exchange tube bundle 203, which affects the heat exchange efficiency of subsequent materials. In existing technologies, the shell is removed and the cleaning is done manually, which is quite cumbersome. This application addresses the issue by injecting an alkaline cleaning solution into the tube body 102 if the fouling is oily coke, and by using an alkaline cleaning solution if the fouling is scale or rust. By injecting the cleaning solution into the tube body 102, the fouling inside the tube body 102 and on the heat exchange tube bundle 203 can be removed through soaking and cleaning. To improve the cleaning effect, during the cleaning process inside the pipe 102, hydraulic oil is injected into the first pipe 404, allowing the hydraulic oil to flow into the inner cavity of the storage housing 401. Initially, the end of the piston rod 402 is located in the storage housing 401 near the partition 403. As the hydraulic oil is gradually injected into the storage housing 401, it pushes the piston rod 402 away from the partition 403, causing the piston rod 402 to move forward. One end of the piston rod 402 is fixed with a piston rod 502, allowing the piston rod 502 to slide inside the mounting tube 501. Initially, the end of the piston rod 502 is away from the storage housing 401. As the piston rod 402 drives the piston rod 502 to move forward, the piston rod 502 moves closer to the storage housing 401. At this time, in the mounting tube 501... A suction negative pressure is generated at the right end of 01, allowing the cleaning material outside the installation tube 501 to be sucked into the interior of the installation tube 501 through the second port 506. When the piston rod 402 moves to the maximum position at the left end of the installation tube 501, the piston rod 402 also moves to the maximum position at the left end of the storage shell 401, stopping the injection of hydraulic oil into the first pipeline 404. At this time, by injecting hydraulic oil into the second pipeline 405, the hydraulic oil pushes the piston rod 402 and piston rod 502 to quickly reset, that is, the piston rod 402 and piston rod 502 move in opposite directions, and the hydraulic oil sucked in from the right side of the installation tube 501 is quickly sprayed out through the second port 506. The sprayed cleaning material is used to flush and clean the inside of the tube body 102 and the heat exchange tube bundle 203, further improving the cleaning effect. When the piston rod 502 moves forward, a suction negative pressure is generated on the right side of the mounting tube 501. As the piston rod 502 moves forward, a squeezing force is generated on the left side of the mounting tube 501. Through this setting, by utilizing the forward and reverse movements of the piston push rod 402 and the piston rod 502, when the right side of the mounting tube 501 generates suction force, the left side generates squeezing force; when the right side of the mounting tube 501 generates squeezing force, the left side generates suction force. When the left side of the mounting tube 501 generates squeezing force, the cleaning material is quickly sprayed out through the first pipe port 504 to flush and clean the tube body 102 and the heat exchange tube bundle 203. Through forward and reverse movements, the first pipe port 504 and the second pipe port 506 flush and clean the inside of the tube body 102 and the heat exchange tube bundle 203, thereby improving the dirt cleaning effect. After acid washing or alkaline washing, clean water needs to be injected into the inside of the tube body 102, and the piston push rod 402 moves back and forth in both directions to clean the inside of the tube body 102 and remove the acid washing solvent or alkaline solvent residue.

[0035] Example 2 is based on Example 1. For details, please refer to [link / reference]. Figures 1 to 12The tube body 102 is equipped with a feed pipe 103 and a discharge pipe 104 respectively. The material flows into the tube body 102 from the feed pipe 103 and flows out from the discharge pipe 104. The heat exchange mechanism 2 also includes a partition plate 202 that divides the internal space of the connecting shell 101. The upper and lower outer surfaces of the connecting shell 101 are respectively equipped with a liquid outlet pipe 205 and a liquid inlet pipe 201. Several flow-blocking baffles 204 are installed inside the tube body 102. The baffles 204 are fitted over the outside of the heat exchange tube bundle 203. The heat exchange medium flows into the heat exchange tube bundle 203 through the liquid inlet pipe 201 and flows out from the liquid outlet pipe 205. The storage shell 401 is equipped with a partition plate 403 that restricts the movement of the piston push rod 402. The tube body 102 is equipped with a feed pipe 103 and a discharge pipe 104, allowing the material to enter the tube body 102 through the feed pipe 103. Several baffle plates 204 are fixed inside the tube body 102. The baffle plates 204 are arranged in an alternating manner, so that when the material flows inside the tube body 102, the flow of the material is blocked by the alternating baffle plates 204, increasing the flow time of the material inside the tube body 102, thereby improving the heat exchange efficiency, and finally allowing the material to flow out from the discharge pipe 104. The connecting shell 101 is provided with an inlet pipe 201 and an outlet pipe 205, allowing the heat exchange medium to flow into the interior of the partition plate 202 from the inlet pipe 201. The partition plate 202 is located in the middle of the connecting shell 101, which is used to divide the space and prevent liquid from flowing directly out of the outlet pipe 205 without passing through the heat exchange tube bundle 203. The heat exchange medium flowing into the interior of the connecting shell 101 enters the heat exchange tube bundle 203, flows back into the upper part of the partition plate 202 of the connecting shell 101, and flows out from the outlet pipe 205. This arrangement allows the heat exchange medium to enter from below and flow out from above. This method ensures that the heat exchange medium can fill the heat exchange tube bundle 203, avoiding cavities in the heat exchange tube bundle 203 that would affect heat exchange efficiency. The storage shell 401 is rotatably installed inside the partition plate 202. An installation plate is provided between the connecting shell 101 and the tube body 102. The installation tube 501 is rotatably installed on the installation plate. Both ends of the heat exchange tube bundle 203 pass through the installation plate and extend into the connecting shell 101. The installation tube 501 passes through the installation plate. The rightmost installation tube 501 is rotatably connected to the installation plate. The heat exchange medium can be water, which can be selected by those skilled in the art according to actual needs.

[0036] Example 3 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 12The cleaning mechanism 5 also includes a first through pipe 505 and a second port 506 located inside the installation pipe 501. The ends of the first through pipe 505 and the second port 506 are respectively connected to the inner cavity of the installation pipe 501. The first port 504 is connected to the first through pipe 505, and the second port 506 is connected to the second through pipe 507. The first through pipe 505 and the second through pipe 507 are both spirally arranged, and there is a height difference between the first through pipe 505 and the second through pipe 507. The first port 504 and the second port 506 are evenly distributed along the trajectory of the first through pipe 505 and the second through pipe 507, respectively, thereby increasing the flushing and cleaning range.

[0037] The mounting pipe 501 has a first through pipe 505 and a second through pipe 507, both of which are spirally oriented. The first pipe opening 504 and the second pipe opening 506 are spirally distributed along the trajectory on the mounting pipe 501. This arrangement disperses the distribution of the first pipe opening 504 and the second pipe opening 506. The spiral starting point of the first through pipe 505 is 90°, and the spiral starting point of the second through pipe 507 is 270°. This arrangement allows several first pipe openings 504 and second pipe openings 506 to be staggered, increasing the scouring and cleaning range when subsequent spraying cleaning materials, thereby reducing scouring and cleaning dead zones and improving the cleaning effect. Furthermore, the first through pipe 505 and the second through pipe 507 have a height difference, ensuring that the first through pipe 505 and the second pipe opening 506 are not misaligned and guaranteeing the stability of the flow path.

[0038] Example 4 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 12 The installation tube 501 is also equipped with a suction mechanism 6, which includes a guide tube 601. Both ends of the guide tube 601 extend into the installation tube 501 and communicate with its internal cavity. Both ends of the guide tube 601 are also equipped with one-way valves 602 to restrict gas flow. The installation tube 501 is also provided with a connecting tube 603 that communicates with the end of the guide tube 601, so that the guide tubes 601 on two adjacent sets of installation tubes 501 are connected through the connecting tube 603. A connecting tube 604 is installed between the storage shell 401 and the installation tube 501, so that the first end of the installation tube 501 is connected to the connecting tube 604 through the connecting tube 603. The storage shell 401 is provided with an air inlet pipe 605 that extends out of the connecting shell 101. The air inlet pipe 605 is connected to the connecting tube 604. The air inlet pipe 605 is connected to the connecting tube 603 through the connecting tube 604, so that the external gas finally enters the cavity of the installation tube 501 through the guide tube 601.

[0039] An air guide pipe 601 is provided on the installation pipe 501. When the piston rod 402 moves in the forward direction, a suction negative pressure is generated on the right side of the installation pipe 501. When the cleaning material is drawn into the installation pipe 501, external gas is allowed to enter the connecting pipe 604 through the air inlet pipe 605. The connecting pipe 604 is connected to the connecting pipe 603, allowing external gas to enter the air guide pipe 601 through the connecting pipe 603. A one-way valve 602 is provided at the end of the air guide pipe 601, allowing gas to flow into the cavity of the installation pipe 501 but preventing gas from flowing back into the cavity of the installation pipe 501. The gas enters the gas inlet pipe 601, and each set of installation pipes 501 is connected by a connecting pipe 603, so that each set of installation pipes 501 can draw gas. With this setting, when the piston rod 402 moves forward and draws the cleaning material, it will simultaneously draw some gas into the installation pipe 501, so that there are two phases of gas and liquid in the installation pipe 501 at the same time. When the piston rod 402 moves rapidly in the reverse direction, the two phases of gas and liquid flow out from the first pipe port 504. When the two phases of gas and liquid flow out of the first pipe port 504, a large number of cavitation bubbles will be generated in the liquid due to the drastic change in flow rate. After these bubbles impact the dirt surface with the jet, they will collapse violently in a very short time. When the bubbles collapse, they will generate shock waves and extremely high-speed micro-jet streams in the microscopic local area, which will then impact the dirt at a high frequency, improving the cleaning effect of the dirt. Moreover, the mixing of gas and liquid greatly enhances the turbulence of the fluid. The bursting and movement of bubbles near the tube wall will greatly enhance the shear force of the fluid on the wall surface, improving the cleaning effect on the dead corners of the heat exchange tube bundle 203.

[0040] Example 5 is an improvement upon Example 4. For details, please refer to [link / reference]. Figures 1 to 12 An adjustment mechanism 7 is installed in both the first port 504 and the second port 506. The adjustment mechanism 7 includes a connecting cavity 701 and a blocking block 703 located inside the connecting cavity 701. A sliding rod 702 that restricts the movement of the blocking block 703 passes through its interior. Springs 704 are installed on both sides of the blocking block 703 to restrict the movement of the blocking block 703 and to generate resistance to the material flow in the first port 504 and the second port 506, thereby improving the uniformity of material spraying in the first port 504 and the second port 506. Because there are several first ports 504 and second ports 506, in order to improve the uniformity of liquid flow in the first ports 504 and second ports 506, an adjustment mechanism 7 is provided in both the first ports 504 and second ports 506. A sealing block 703 is installed inside the connecting cavity 701. When the cavity is stationary, the sealing block 703 seals the connecting cavity 701. When a suction negative pressure is generated at the first through pipe 505, the sealing block 703 moves closer to the first through pipe 505 and slides on the slide rod 702. The sliding of the sealing block 703 is limited by symmetrically arranged sliding rods 702. During the sliding process, the sealing block 703 compresses the spring 704 near the first through pipe 505 and stretches the spring 704 on the other side, ultimately opening the connecting cavity 701. This allows external cleaning materials to enter the first through pipe 505 through the connecting cavity 701 and eventually into the installation pipe 501. When the first through pipe 505 generates pressure, the sealing block 703 generates reverse resistance, allowing the material inside the first through pipe 505 to... The extrusion pressure is relatively uniform. As the extrusion pressure increases, it will push the sealing block 703 away from the first pipe 505 and open the connecting cavity 701, allowing the medium in the first pipe 505 to flow out from the connecting cavity 701. This setting improves the uniformity of liquid flow in several first pipe ports 504 and second pipe ports 506. Furthermore, due to the sealing block 703, when the first pipe 505 generates suction, the resistance of the sealing block 703 allows external gas to overcome the one-way valve 602 and flow into the installation pipe 501.

[0041] Example 6 is an improvement upon Example 5. For details, please refer to [link / reference]. Figures 1 to 12 A drive mechanism 3 is installed on the outer wall of the connecting shell 101. The drive mechanism 3 includes an installation shell 301 fixed to the connecting shell 101 and a worm gear 304 fixed to the outside of the storage shell 401. A crossbar 503 is fixed between the storage shell 401 and the installation tube 501. Rotating the worm gear 304 drives the installation tube 501 to rotate and changes the position of the first pipe port 504 and the second pipe port 506, thereby changing the flushing and cleaning position. A drive motor 302 is installed at the bottom of the installation shell 301. The output end of the drive motor 302 extends into the interior of the installation shell 301 and is fixed to the worm 303. The worm 303 meshes with the worm gear 304 for transmission. Because the positions of several first ports 504 and second ports 506 distributed on the mounting pipe 501 are fixed, the flushing positions of the pipe body 102 and the heat exchange tube bundle 203 remain the same, resulting in certain coverage dead angles. At this time, by controlling the drive motor 302 to rotate, the drive motor 302 drives the worm gear 303 to rotate inside the mounting housing 301. The worm gear 303 is connected to the worm wheel 304, which in turn drives the worm wheel 304 and the storage housing 401 to rotate. A crossbar 503 is provided between the storage housing 401 and the mounting pipe 501, allowing the storage housing 401 and the crossbar 503 to rotate synchronously, thereby changing the positions of the first ports 504 and second ports 506 on the mounting pipe 501, increasing the spray flushing cleaning range, and further improving the cleaning effect. It should be noted that the storage shell 401 can only rotate 360° and then rotate in the opposite direction to avoid affecting the connection between the first pipe 404 and the air inlet pipe 605. The air inlet pipe 605 can directly draw in outside air, or inert gas can be injected into the air inlet pipe 605 through the pipe connection. A pressure relief valve is installed on the feed pipe 103. When the cleaning material is soaking in the heat exchanger, the liquid level must not exceed the minimum installation height of the pressure relief valve. When the subsequent installation pipe 501 draws in outside gas and discharges it into the pipe body 102, excess gas can be discharged through the pressure relief valve.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Several improvements and modifications can be made without departing from the technical principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A tubular heat exchanger for chemical use, comprising a connecting shell (101) and a heat exchange mechanism (2), wherein a tube body (102) is bolted to one side of the connecting shell (101), and the heat exchange mechanism (2) comprises a heat exchange tube bundle (203) located inside the tube body (102). Its features are, Also includes: The cleaning mechanism (5) is located in the middle of the tube body (102). The cleaning mechanism (5) includes a number of installation tubes (501) connected end to end. A piston rod (502) is installed in the cavity of the installation tube (501), and a first pipe port (504) and a second pipe port (506) are respectively installed on its surface. The material enters and exits the cavity of the installation tube (501) from the first pipe port (504) and the second pipe port (506). The pushing mechanism (4) is located in the middle of the connecting shell (101). The pushing mechanism (4) includes a storage shell (401) and a piston push rod (402) located in the cavity of the storage shell (401). The end of the piston push rod (402) extends out of the storage shell (401) and is connected to the piston rod (502). The mounting tube (501) is equipped with a first pipeline (404) and a second pipeline (405). Hydraulic oil enters the storage shell (401) from the first pipeline (404) and drives the piston rod (502) to move forward. The mounting tube (501) sucks up the material. Hydraulic oil enters the storage shell (401) from the second pipeline (405) and drives the piston push rod (402) to move in the opposite direction. The mounting tube (501) squeezes out the material to flush and clean the heat exchange tube bundle (203).

2. The tubular heat exchanger for chemical applications according to claim 1, characterized in that: The pipe body (102) is equipped with a feed pipe (103) and a discharge pipe (104). The material flows into the pipe body (102) from the feed pipe (103) and flows out from the discharge pipe (104).

3. The tubular heat exchanger for chemical applications according to claim 1, characterized in that: The heat exchange mechanism (2) further includes a partition plate (202) that divides the internal space of the connecting shell (101). The upper and lower outer surfaces of the connecting shell (101) are respectively equipped with an outlet pipe (205) and an inlet pipe (201). Several flow-blocking baffles (204) are installed inside the pipe body (102). The baffles (204) are fitted over the outside of the heat exchange tube bundle (203). The heat exchange medium flows into the heat exchange tube bundle (203) through the inlet pipe (201) and flows out from the outlet pipe (205).

4. The tubular heat exchanger for chemical applications according to claim 1, characterized in that: The cleaning mechanism (5) further includes a first through pipe (505) and a second port (506) opened inside the installation pipe (501). The ends of the first through pipe (505) and the second port (506) are respectively connected to the inner cavity of the installation pipe (501). The first port (504) is connected to the first through pipe (505), and the second port (506) is connected to the second through pipe (507).

5. The tubular heat exchanger for chemical applications according to claim 4, characterized in that: The first pipe (505) and the second pipe (507) are both spirally arranged, and there is a height difference between the first pipe (505) and the second pipe (507). The first pipe opening (504) and the second pipe opening (506) are evenly distributed along the trajectory of the first pipe (505) and the second pipe (507), respectively, thereby increasing the flushing and cleaning range.

6. The tubular heat exchanger for chemical applications according to claim 4, characterized in that: The mounting tube (501) is also equipped with a suction mechanism (6), which includes a guide tube (601). Both ends of the guide tube (601) extend into the mounting tube (501) and communicate with its internal cavity. Both ends of the guide tube (601) are also equipped with one-way valves (602) that restrict gas flow.

7. The tubular heat exchanger for chemical applications according to claim 6, characterized in that: The mounting tube (501) is also provided with a connecting tube (603) that communicates with the end of the air guide tube (601), so that the air guide tubes (601) on two adjacent sets of mounting tubes (501) are connected through the connecting tube (603). A connecting tube (604) is installed between the storage shell (401) and the mounting tube (501). An air inlet tube (605) with its end extending out of the connecting shell (101) is provided on the storage shell (401). The air inlet tube (605) is connected to the connecting tube (603) through the connecting tube (604), so that the external gas finally enters the cavity of the mounting tube (501) through the air guide tube (601).

8. The tubular heat exchanger for chemical applications according to claim 4, characterized in that: An adjustment mechanism (7) is installed in both the first port (504) and the second port (506). The adjustment mechanism (7) includes a connecting cavity (701) and a blocking block (703) located inside the connecting cavity (701). A sliding rod (702) that restricts the movement of the blocking block (703) passes through its interior. Springs (704) are installed on both sides of the blocking block (703) to restrict the movement of the blocking block (703) and to generate resistance to the material flow in the first port (504) and the second port (506), thereby improving the uniformity of material spraying in the first port (504) and the second port (506).

9. The tubular heat exchanger for chemical applications according to claim 1, characterized in that: The outer wall of the connecting shell (101) is equipped with a driving mechanism (3). The driving mechanism (3) includes an installation shell (301) fixed to the connecting shell (101) and a worm gear (304) fixed to the outside of the storage shell (401). A crossbar (503) is fixed between the storage shell (401) and the installation tube (501). Rotating the worm gear (304) drives the installation tube (501) to rotate and changes the position of the first port (504) and the second port (506), thereby changing the flushing and cleaning position.

10. The tubular heat exchanger for chemical applications according to claim 9, characterized in that: The bottom of the mounting housing (301) is equipped with a drive motor (302). The output end of the drive motor (302) extends into the mounting housing (301) and is fixed with the worm (303). The worm (303) meshes with the worm wheel (304) for transmission. The storage housing (401) is equipped with a partition (403) to restrict the movement of the piston push rod (402).

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