Tube heat exchanger with self-cleaning function for ammonia water preparation

Abstract

The application discloses a shell-and-tube heat exchanger with a self-cleaning function for ammonia water preparation, and relates to the technical field of heat exchange devices.The shell-and-tube heat exchanger comprises a shell and heat exchange tubes, the end of the shell is provided with a head, four tube sheets are arranged in the shell, the four tube sheets are arranged at the two ends and the middle position of the shell, and the shell is divided into two shell passes; an outlet and an inlet are arranged in each shell pass of the shell, the heat exchange tubes are arranged on the tube sheets, a plurality of baffle plates are arranged on the heat exchange tubes, and a cleaning mechanism for cleaning the inner surface and / or the outer surface of the heat exchange tubes is arranged in the shell.The first shell pass is used for heat exchange between liquid ammonia and ammonia water flowing down from the upper tube pass, and the second shell pass is used for heat exchange between refrigerant and ammonia water, so that the ammonia water with the required concentration is prepared through heat exchange of the refrigerant.The process of preparing the ammonia water from the liquid ammonia is only carried out in one shell-and-tube heat exchanger, reaction heat is reasonably utilized, energy is saved, and the number of devices is saved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange device technology, specifically a shell-and-tube heat exchanger with self-cleaning function for ammonia preparation. Background Technology

[0002] In industrial production, the preparation of ammonia water from liquid ammonia is a crucial process in chemical, pharmaceutical, and environmental protection fields. Traditional processes typically employ multiple tube heat exchangers connected in series or parallel to achieve the mixing reaction of liquid ammonia and water. For example, existing technologies often use a combined system of ammonia vaporization tank and ammonia absorption tank, utilizing steam to heat and vaporize the liquid ammonia, followed by cooling water circulation to absorb the heat of dissolution of the ammonia, thereby controlling the reaction temperature and increasing the ammonia water concentration. However, existing technologies suffer from the following technical problems:

[0003] 1. The system requires a multi-stage heat exchange system, resulting in a large equipment size and footprint. Liquid ammonia vaporization requires the absorption of a large amount of heat, and traditional processes often rely on external steam heating. The heat of solution released when ammonia dissolves in water is not effectively recovered and utilized, leading to energy waste.

[0004] 2. After a period of use, the heat exchanger needs to be cleaned. Existing heat exchangers do not have a self-cleaning function and still require manual cleaning. Summary of the Invention

[0005] The purpose of this invention is to provide a shell-and-tube heat exchanger with a self-cleaning function for ammonia preparation, so as to solve the problems of the prior art that requires multiple heat exchangers to prepare ammonia and cannot automatically clean the heat exchange tubes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a shell-and-tube heat exchanger for ammonia preparation with self-cleaning function, comprising a shell and heat exchange tubes, a cap installed at the end of the shell, at least two tube sheets installed inside the shell, an outlet and an inlet provided on the shell, the heat exchange tubes inserted through the tube sheets, multiple baffles installed on the heat exchange tubes, and a cleaning mechanism for cleaning the inner and / or outer surfaces of the heat exchange tubes provided inside the shell.

[0007] The number of tube sheets is four, and the cleaning mechanism includes a plate cleaning mechanism disposed between two tube sheets located in the middle position;

[0008] The plate cleaning mechanism includes at least two sets of sleeves, push-pull rods located in the sleeves, and a drive assembly that drives the push rods to move. Each set of sleeves passes through a baffle plate and is rotatably connected to the tube sheet.

[0009] The sleeve is provided with a through groove, and the baffle is connected to the push-pull rod through the through groove.

[0010] There are two sleeves in a set. One end of each sleeve passes through the tube sheet located in the middle position, and the other end is embedded in the tube sheet located at the edge of the shell and rotatably connected to it.

[0011] When the drive assembly rotates the push-pull rod, the push-pull rod drives the baffle to move on the casing and heat exchange tubes. The movement of the baffle is used to clean the outer surface of the casing and heat exchange tubes.

[0012] The push-pull rod includes an inner shaft slidably mounted in the sleeve and a drive shaft threadedly driven by the inner shaft. The middle section of the drive shaft engages with the drive assembly for transmission. The drive shaft is a threaded rod with a smooth middle section. The drive shaft passes through the inner shaft, and the inner wall of the inner shaft is provided with a threaded groove. When the drive assembly drives the drive shaft to rotate, under the position constraint of the tube sheet, the drive shaft causes the inner shaft to move linearly in the sleeve through threaded transmission, thereby causing the baffle to move on the sleeve and the heat exchange tube.

[0013] The drive assembly includes a drive source connected to the housing and a drive ring mounted between two tube sheets via bearings. The drive source and drive ring drive each other. A gear ring is provided on the inner side of the drive ring, and the gear ring meshes with a gear located in the middle of the drive shaft. The drive source is an external rotor motor, with a gear mounted on its outer circumference. The drive ring has toothed grooves on its outer circumference, and the drive source meshes with the drive ring through these toothed grooves. When the drive source is running, the gear ring rotates under the drive ring's influence and meshes with the gear on the drive shaft, thereby causing the drive shaft to rotate.

[0014] The cleaning mechanism includes a tube cleaning mechanism installed on the heat exchange tube. The tube cleaning mechanism includes rotating components installed at both ends of the heat exchange tube and a connector connecting the two rotating components. The connector is located in the heat exchange tube. One end of the rotating component is connected to the tube sheet. When the medium (i.e., ammonia water) flows through the rotating component, the connector rotates in the heat exchange tube.

[0015] The rotating assembly includes a sealing plate mounted on a tube sheet and an annular seat connected to the sealing plate via a support member. The sealing plate is fitted onto the heat exchange tubes. A rotating ring is rotatably mounted on the annular seat, and a fan is mounted on the rotating ring. The two ends of the connector are movably connected to two fans, respectively. Besides providing a base for the annular seat, the sealing plate also improves the sealing effect between the heat exchange tubes and the tube sheet. When the medium impacts the fan, the fan rotates, causing the connector to rotate within the heat exchange tubes. The connector turbulents the medium within the heat exchange tubes, preventing impurities from adhering to the inner wall of the tubes and extending the cleaning cycle. It also disturbs the flowing medium, improving its heat exchange efficiency.

[0016] The connector is a spiral plate.

[0017] A sliding sleeve is provided on the end face where the fan connects to the connector. A carrier plate is slidably mounted on the sliding sleeve. An eccentric mechanism is installed in the sliding sleeve. A through hole is provided on the fan to connect to the inside of the sliding sleeve. The eccentric mechanism causes the carrier plate to move on the sliding sleeve. The eccentric mechanism is a mechanism that can realize reciprocating linear motion, such as a piston hydraulic cylinder, a telescopic hydraulic cylinder, an electric telescopic rod, a push rod motor, etc. The through hole is used to insert the wire connecting the eccentric mechanism or the traction wire connecting the eccentric mechanism to the external drive structure. When turbulence occurs in the heat exchange tube, the rotation centerline of the spiral plate is collinear with the rotation centerline of the fan. When the eccentric mechanism moves the carrier plate on the fan and approaches the inner wall of the heat exchange tube, an eccentric motion occurs between the carrier plate and the fan, thereby causing the outer circle of the spiral plate to contact the inner wall of the heat exchange tube. With the help of the fan's rotation, the spiral plate cleans the inner wall of the heat exchange tube.

[0018] Both the inner ring of the ring seat and the outer ring of the rotating ring are provided with ball grooves, and the ball grooves are filled with balls. The rotating ring is rotatably connected to the ring seat through the balls.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The process of producing ammonia water from liquid ammonia is carried out in only one shell-and-tube heat exchanger, which makes reasonable use of the heat of reaction, saves energy, and reduces the number of equipment.

[0020] 2. When the medium (i.e., ammonia water) impacts the fan, the fan drives the connecting parts to rotate in the heat exchange tube during rotation. The connecting parts turbulent the medium in the heat exchange tube, which on the one hand prevents impurities from adhering to the inner wall of the heat exchange tube and prolongs the cleaning cycle of the heat exchange tube, and on the other hand, disturbs the flowing medium to improve the heat exchange effect of the medium.

[0021] When the carrier plate and the fan move eccentrically, the outer circle of the spiral plate comes into contact with the inner wall of the heat exchange tube. With the help of the power generated by the rotation of the fan, the spiral plate cleans the inner wall of the heat exchange tube, thus achieving a cleaning effect on the heat exchange tube, reducing the burden of manual cleaning, realizing automated cleaning and improving cleaning efficiency. Attached Figure Description

[0022] Figure 1 This is a perspective view of the overall structure of the present invention;

[0023] Figure 2 This is a three-dimensional half-sectional view of the present invention;

[0024] Figure 3 This is a diagram showing the installation position of the plate cleaning mechanism of the present invention;

[0025] Figure 4 This is a perspective view of the connection between the sleeve and the tube sheet of the present invention;

[0026] Figure 5 This is a perspective view of the push-pull rod of the present invention;

[0027] Figure 6 This is a perspective view of the driving component of the present invention;

[0028] Figure 7 This is a perspective view of the tube cleaning mechanism of the present invention installed on the heat exchange tube;

[0029] Figure 8 This is a perspective view of the rotating component of the present invention;

[0030] Figure 9 This is a perspective view of the connection between the spiral rotor and the fan in this invention;

[0031] Figure 10 This is an exploded view of the connection between the fan and the carrier plate of the present invention (fan blades removed);

[0032] Figure 11 This is a process flow diagram of the present invention.

[0033] In the diagram: 1. Shell; 2. Head; 3. Tube sheet; 4. Baffle; 5. Heat exchange tube; 6. Plate cleaning mechanism; 7. Tube cleaning mechanism; 61. Drive source; 62. Drive ring; 63. Sleeve; 64. Inner shaft; 65. Drive shaft; 66. Gear ring; 71. Sealing plate; 72. Ring seat; 73. Rotating ring; 74. Fan; 75. Spiral plate; 76. Sliding sleeve; 77. Carrier plate; a. Shell side inlet 1; b. Shell side outlet 1; c. Shell side inlet 2; d. Shell side outlet 2. Detailed Implementation

[0034] 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.

[0035] Example: Figure 1 - Figure 11 As shown, the present invention provides a technical solution: a shell-and-tube heat exchanger with self-cleaning function for ammonia preparation, comprising a shell 1 and heat exchange tubes 5, a head 2 installed at the end of the shell 1, and four tube sheets 3 installed inside the shell 1, the four tube sheets 3 being installed at both ends and the middle of the shell 1 respectively, dividing the interior of the shell 1 into upper and lower shell sections.

[0036] The shell 1 has an inlet and an outlet between two adjacent tube sheets 3 in each shell side, namely shell side inlet a and shell side outlet b, and shell side inlet c and shell side outlet d.

[0037] Shell-side inlet a and shell-side outlet b are located between the two tube sheets 3 in the lower shell side;

[0038] The inlet c and outlet d of the second shell side are located between the two tube sheets 3 in the upper shell side.

[0039] Shell-side outlet b can be connected to the mixer upstream of the heat exchanger (the mixer outlet is connected to the tube-side inlet of the heat exchanger). Liquid nitrogen is introduced into the lower shell-side through shell-side inlet a, and after exchanging heat with the ammonia water coming down from the upper tube-side, it flows out from shell-side outlet b and mixes with pure water in the mixer to form ammonia water before entering the upper tube-side of the heat exchanger.

[0040] The upper shell side is cooled by introducing refrigerant through the shell side inlet c. After heat exchange, the refrigerant flows out through the shell side outlet d. Through the heat exchange of the refrigerant, the required concentration of ammonia water is obtained in the lower part of the tube side.

[0041] The heat exchange tubes 5 are inserted on the tube sheet 3. Multiple baffles 4 are installed on the heat exchange tubes 5. A cleaning mechanism for cleaning the inner and / or outer surfaces of the heat exchange tubes 5 is provided inside the shell 1. Example

[0042] The cleaning mechanism includes a plate cleaning mechanism 6 located between two tube sheets 3 in the middle position, and a baffle 4 movably installed on the heat exchange tube 5.

[0043] The plate cleaning mechanism 6 includes four sets of sleeves 63 that pass through the baffle 4, push-pull rods located in the sleeves 63, and a drive assembly that drives the push rods to move.

[0044] Four sets of sleeves 63 are arranged in a circle, with two sleeves 63 in each set. One end of each sleeve 63 passes through the tube sheet 3 located in the middle position, and the other end is embedded in the tube sheet 3 located at the edge of the shell 1 and rotatably connected to it.

[0045] The sleeve 63 is provided with a through groove, and the baffle 4 is connected to the push-pull rod through the through groove.

[0046] The push-pull rod includes an inner shaft 64 slidably mounted in a sleeve 63, and a drive shaft 65 threadedly driven by the inner shaft 64. The drive shaft 65 is a threaded rod with a smooth shaft in the middle section. The drive shaft 65 passes through the inner shaft 64, and the inner wall of the inner shaft 64 is provided with a threaded groove. The middle section of the drive shaft 65 engages with the drive assembly for transmission.

[0047] The drive assembly includes a drive source 61 connected to the housing 1. The drive source 61 is an external rotor motor. Gears are mounted on the outer circle of the external rotor motor. A drive ring 62 is mounted between two tube sheets 3 via bearings. The outer circle of the drive ring 62 is provided with tooth grooves. The drive source 61 engages with the drive ring 62 through the gear tooth grooves for transmission.

[0048] The bearings include a thrust ball bearing mounted on one side of the tube sheet 3 and a ball bearing mounted on the inner wall of the housing 1. The two ends of the drive ring 62 are connected to the thrust ball bearing, and the outer circles of the two ends of the drive ring 62 are connected to the ball bearing.

[0049] A gear ring 66 is provided on the inner side of the drive ring 62, and the gear ring 66 meshes with a gear in the middle section of the drive shaft 65 for transmission.

[0050] When the drive source 61 is running, the gear ring 66 rotates under the drive ring 62 and meshes with the gear on the drive shaft 65, thereby causing the drive shaft 65 to rotate. When the drive shaft 65 rotates, under the position constraint of the tube sheet 3, the drive shaft 65 causes the inner shaft 64 to move linearly in the sleeve 63 through threaded transmission, thereby causing the baffle 4 to move on the sleeve 63 and the heat exchange tube 5. The movement of the baffle 4 is used to clean the outer surface of the sleeve 63 and the heat exchange tube 5. Example

[0051] The cleaning mechanism includes a pipe cleaning mechanism 7 installed on the heat exchange tube 5.

[0052] The tube cleaning mechanism 7 includes rotating components installed at both ends of the heat exchange tube 5, and a connector connecting the two rotating components. The connector is located in the heat exchange tube 5. One end of the rotating component is connected to the tube sheet 3. When the medium flows through the rotating component, the connector rotates in the heat exchange tube 5.

[0053] The connector is a spiral plate 75.

[0054] The rotating assembly includes a sealing plate 71 mounted on the tube sheet 3 and an annular seat 72 connected to the sealing plate 71 via a support member. The sealing plate 71 is sleeved on the heat exchange tube 5. A rotating ring 73 is rotatably mounted on the annular seat 72. A fan 74 is mounted on the rotating ring 73. The two ends of the connector are movably connected to the two fans 74 respectively.

[0055] Both the inner ring of the ring seat 72 and the outer ring of the rotating ring 73 are provided with ball grooves, which are filled with balls. The rotating ring 73 is rotatably connected to the ring seat 72 through the balls.

[0056] A sliding sleeve 76 is provided on the end face of the fan 74 that is connected to the connector. A carrier plate 77 is slidably mounted on the sliding sleeve 76. An eccentric mechanism is installed in the sliding sleeve 76. A through hole is provided on the fan 74 that connects to the inside of the sliding sleeve 76. The eccentric mechanism causes the carrier plate 77 to move on the sliding sleeve 76.

[0057] An eccentric mechanism is a mechanism that can achieve reciprocating linear motion, such as a piston hydraulic cylinder, a telescopic hydraulic cylinder, an electric telescopic rod, and a push rod motor. Through holes are used to insert wires connecting the eccentric mechanism or traction lines connecting the eccentric mechanism to an external drive structure.

[0058] When the airflow is turbulent in the heat exchange tube 5, the rotation centerline of the spiral plate 75 is collinear with the rotation centerline of the fan 74. When the eccentric mechanism moves the carrier plate 77 on the fan 74 and approaches the inner wall of the heat exchange tube 5, an eccentric motion occurs between the carrier plate 77 and the fan 74, which causes the outer circle of the spiral plate 75 to contact the inner wall of the heat exchange tube 5. With the help of the rotation of the fan 74, the spiral plate 75 cleans the inner wall of the heat exchange tube 5.

[0059] When the medium impacts the fan 74, the fan 74 drives the connecting piece to rotate in the heat exchange tube 5 during its rotation. The connecting piece turbulents the medium in the heat exchange tube 5, which on the one hand prevents impurities from adhering to the inner wall of the heat exchange tube 5, and on the other hand disturbs the flowing medium, thereby improving the heat exchange effect of the medium. Example

[0060] When it is necessary to clean the outer and inner surfaces of the heat exchange tube 5, the plate cleaning mechanism 6 and the tube cleaning mechanism 7 are used simultaneously. The cleaning mechanism includes both the plate cleaning mechanism 6 and the tube cleaning mechanism 7.

[0061] The plate cleaning mechanism 6 is located between the two tube sheets 3 in the middle position, and the baffle 4 is movably installed on the heat exchange tube 5.

[0062] The plate cleaning mechanism 6 includes four sets of sleeves 63 that pass through the baffle 4, push-pull rods located in the sleeves 63, and a drive assembly that drives the push rods to move.

[0063] Four sets of sleeves 63 are arranged in a circle, with two sleeves 63 in each set. One end of each sleeve 63 passes through the tube sheet 3 located in the middle position, and the other end is embedded in the tube sheet 3 located at the edge of the shell 1 and rotatably connected to it.

[0064] The sleeve 63 is provided with a through groove, and the baffle 4 is connected to the push-pull rod through the through groove.

[0065] The push-pull rod includes an inner shaft 64 slidably mounted in a sleeve 63, and a drive shaft 65 threadedly driven by the inner shaft 64. The drive shaft 65 is a threaded rod with a smooth shaft in the middle section. The drive shaft 65 passes through the inner shaft 64, and the inner wall of the inner shaft 64 is provided with a threaded groove. The middle section of the drive shaft 65 engages with the drive assembly for transmission.

[0066] The drive assembly includes a drive source 61 connected to the housing 1. The drive source 61 is an external rotor motor. Gears are mounted on the outer circle of the external rotor motor. A drive ring 62 is mounted between two tube sheets 3 via bearings. The outer circle of the drive ring 62 is provided with tooth grooves. The drive source 61 engages with the drive ring 62 through the gear tooth grooves for transmission.

[0067] The bearings include a thrust ball bearing mounted on one side of the tube sheet 3 and a ball bearing mounted on the inner wall of the housing 1. The two ends of the drive ring 62 are connected to the thrust ball bearing, and the outer circles of the two ends of the drive ring 62 are connected to the ball bearing.

[0068] A gear ring 66 is provided on the inner side of the drive ring 62, and the gear ring 66 meshes with a gear in the middle section of the drive shaft 65 for transmission.

[0069] The tube cleaning mechanism 7 includes rotating components installed at both ends of the heat exchange tube 5, and a connector connecting the two rotating components. The connector is located in the heat exchange tube 5. One end of the rotating component is connected to the tube sheet 3. When the medium flows through the rotating component, the connector rotates in the heat exchange tube 5.

[0070] The connector is a spiral plate 75.

[0071] The rotating assembly includes a sealing plate 71 mounted on the tube sheet 3 and an annular seat 72 connected to the sealing plate 71 via a support member. The sealing plate 71 is sleeved on the heat exchange tube 5. A rotating ring 73 is rotatably mounted on the annular seat 72. A fan 74 is mounted on the rotating ring 73. The two ends of the connector are movably connected to the two fans 74 respectively.

[0072] Both the inner ring of the ring seat 72 and the outer ring of the rotating ring 73 are provided with ball grooves, which are filled with balls. The rotating ring 73 is rotatably connected to the ring seat 72 through the balls.

[0073] A sliding sleeve 76 is provided on the end face of the fan 74 that is connected to the connector. A carrier plate 77 is slidably mounted on the sliding sleeve 76. An eccentric mechanism is installed in the sliding sleeve 76. A through hole is provided on the fan 74 that connects to the inside of the sliding sleeve 76. The eccentric mechanism causes the carrier plate 77 to move on the sliding sleeve 76.

[0074] An eccentric mechanism is a mechanism that can achieve reciprocating linear motion, such as a piston hydraulic cylinder, a telescopic hydraulic cylinder, an electric telescopic rod, and a push rod motor. Through holes are used to insert wires connecting the eccentric mechanism or traction lines connecting the eccentric mechanism to an external drive structure.

[0075] The working principle of this invention: Liquid nitrogen is introduced into the lower shell side through shell side inlet a, and after exchanging heat with the ammonia water coming down from the upper tube side, it flows out from shell side outlet b, and mixes with pure water in the mixer to form ammonia water, which then enters the upper tube side of the heat exchanger.

[0076] The upper shell side is cooled by introducing refrigerant through the shell side inlet c. After heat exchange, the refrigerant flows out through the shell side outlet d. Through the heat exchange of the refrigerant, the required concentration of ammonia water is obtained in the lower part of the tube side.

[0077] When it is necessary to clean the heat exchange tube 5, the plate cleaning mechanism 6 and / or the tube cleaning mechanism 7 can be used to clean the surface of the heat exchange tube 5, so as to reduce the time required for manual cleaning and improve the cleaning efficiency.

[0078] When cleaning is performed using the plate cleaning mechanism 6, the drive source 61 operates, and the gear ring 66 rotates under the drive ring 62, meshing with the gear on the drive shaft 65, thereby causing the drive shaft 65 to rotate. When the drive shaft 65 rotates, under the position constraint of the tube sheet 3, the drive shaft 65 causes the inner shaft 64 to move linearly in the sleeve 63 through threaded transmission, thereby causing the baffle 4 to move on the sleeve 63 and the heat exchange tube 5. By utilizing the movement of the baffle 4, the outer surface of the sleeve 63 and the heat exchange tube 5 is cleaned.

[0079] When cleaning is performed using the tube cleaning mechanism 7, the eccentric mechanism moves the carrier plate 77 on the fan 74 and brings it close to the inner wall of the heat exchange tube 5. An eccentric movement occurs between the carrier plate 77 and the fan 74, which causes the outer circle of the spiral plate 75 to contact the inner wall of the heat exchange tube 5. With the help of the rotation of the fan 74, the spiral plate 75 cleans the inner wall of the heat exchange tube 5.

[0080] When the tube cleaning mechanism 7 is not used, the carrier plate 77 is concentric with the fan 74, and the rotation center line of the spiral plate 75 is collinear with the rotation center line of the fan 74. Driven by the fan 74, the spiral plate 75 turbulents in the heat exchange tube 5.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A shell-and-tube heat exchanger with self-cleaning function for ammonia preparation, comprising a shell (1) and heat exchange tubes (5), wherein end caps (2) are installed at the ends of the shell (1), characterized in that: At least two tube sheets (3) are installed inside the shell (1). The shell (1) is provided with an outlet and an inlet. The heat exchange tube (5) is inserted through the tube sheet (3). Multiple baffles (4) are installed on the heat exchange tube (5). The shell (1) is provided with a cleaning mechanism for cleaning the inner and outer surfaces of the heat exchange tube (5). The number of tube sheets (3) is four, and the cleaning mechanism includes a plate cleaning mechanism (6) disposed between two tube sheets (3) located in the middle position. The plate cleaning mechanism (6) includes at least two sets of sleeves (63), push-pull rods located in the sleeves (63), and a drive assembly for driving the push rods to move. Each set of sleeves (63) passes through the baffle plate (4) and is rotatably connected to the tube sheet (3). The sleeve (63) is provided with a through groove, and the baffle (4) is connected to the push-pull rod through the through groove; The push-pull rod includes an inner shaft (64) slidably installed in the sleeve (63) and a drive shaft (65) threadedly driven with the inner shaft (64), wherein the middle section of the drive shaft (65) meshes with the drive assembly for transmission. The drive assembly includes a drive source (61) connected to the housing (1) and a drive ring (62) mounted between two tube sheets (3) via bearings. The drive source (61) drives the drive ring (62). A gear ring (66) is provided on the inner side of the drive ring (62). The gear ring (66) meshes with a gear at the middle section of the drive shaft (65).

2. A shell-and-tube heat exchanger with self-cleaning function for ammonia preparation according to claim 1, characterized in that: The cleaning mechanism includes a tube cleaning mechanism (7) installed on the heat exchange tube (5). The tube cleaning mechanism (7) includes rotating components installed at both ends of the heat exchange tube (5) and a connector connecting the two rotating components. The connector is located in the heat exchange tube (5). One end of the rotating component is connected to the tube sheet (3).

3. A shell-and-tube heat exchanger with self-cleaning function for ammonia preparation according to claim 2, characterized in that: The rotating assembly includes a sealing plate (71) mounted on the tube sheet (3) and an annular seat (72) connected to the sealing plate (71) via a support member. The sealing plate (71) is sleeved on the heat exchange tube (5). A rotating ring (73) is rotatably mounted on the annular seat (72). A fan (74) is mounted on the rotating ring (73). The two ends of the connector are movably connected to the two fans (74) respectively.

4. A shell-and-tube heat exchanger with self-cleaning function for ammonia preparation according to claim 3, characterized in that: The connector is a spiral plate (75).

5. A shell-and-tube heat exchanger with self-cleaning function for ammonia preparation according to claim 3, characterized in that: A sliding sleeve (76) is provided on the end face of the fan (74) connected to the connector. A carrier plate (77) is slidably mounted on the sliding sleeve (76). An eccentric mechanism is installed in the sliding sleeve (76). A through hole is provided on the fan (74) to connect to the inside of the sliding sleeve (76). The eccentric mechanism causes the carrier plate (77) to move on the sliding sleeve (76).

6. A shell-and-tube heat exchanger with self-cleaning function for ammonia preparation according to claim 3, characterized in that: Both the inner ring of the ring seat (72) and the outer ring of the rotating ring (73) are provided with ball grooves, and the ball grooves are filled with balls.

Images