A scraping wall type heat exchanger
By designing pulse cleaning devices and scraping wall springs in the heat exchanger, the online continuous self-cleaning of the inner wall of the heat exchange tube is achieved, solving the problem of unstable reaction process when high-viscosity media flows through, and improving the quality of polymer products and equipment stability.
Patent Information
- Application Number
- CN202011369478.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-11-30
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2040-11-30
AI Technical Summary
The prior art is difficult to realize continuous self-cleaning of the inner wall of the heat exchange tube when a high viscosity medium flows through, resulting in instability in the polymerization process.
A scraping-wall-type heat exchanger is designed, with pulse cleaning devices at both ends, and scraping-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wall-wa
It realizes continuous online self-cleaning of the inner wall of the heat exchange tube, improves the stability of the polymerization process, ensures long-term and stable operation of the equipment, and effectively removes the heat from the high-viscosity medium, and improves the quality of polymer products.
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Figure CN114577057B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of SAN resin production, and particularly to a scraping wall type heat exchanger. Background Art
[0002] The synthesis of SAN resin is one of the three major synthesis technologies of ABS resin. As the continuous phase of ABS resin, it can be synthesized by bulk, suspension, emulsion and solution polymerization methods. The bulk method for producing ABS resin has a very high effective coefficient, is quite advantageous in terms of technology and economy, and the product quality is also superior. Therefore, the current process for producing SAN resin is mainly the bulk method.
[0003] The process of bulk polymerization is copolymerization of two monomers. When the conversion rate of bulk polymerization is controlled at 50% - 70%, the increase in the molecular weight of the polymer makes the viscosity of the system relatively large, generally higher than 10 - 100 Pa·s, and at the same time, a large amount of reaction heat is released. The high viscosity and high exothermicity seriously affect the stability of the reaction process. Therefore, the removal of polymerization reaction heat is an urgent problem to be solved.
[0004] Currently, the main methods to solve the heat removal problem are as follows: First, by reducing the temperature of the materials entering the polymerization system, a large amount of polymerization heat is removed by using the sensible heat or latent heat of vaporization of the monomers. Second, a part of the polymerization reaction liquid is led out of the reactor, and the reaction heat is removed by the method of cooling it in a heat exchanger and then sending it back to the reactor. However, most of the existing technologies are spiral rotary scraping wall or shell side scraping wall operations. These two methods cannot be applied to on-line cleaning of the tube side, and shell side scraping wall will increase the manufacturing difficulty of the shell, and it is not easy to clean during maintenance. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a scraping wall type heat exchanger that can realize the on-line continuous self-cleaning process of the inner wall of the heat exchange tubes when a high-viscosity medium flows through the heat exchange tubes.
[0006] To solve the above problems, a scraping wall type heat exchanger according to the present invention includes a heat exchanger, and is characterized in that: an upper part of one end of the heat exchanger is connected with a pulse cleaning device I through an end cover I, and a lower part of the other end is connected with a pulse cleaning device II through an end cover II; scraping wall springs I are arranged in all the heat exchange tubes in the upper part inside the heat exchanger, and scraping wall springs II are arranged in all the heat exchange tubes in the lower part; one end of the scraping wall spring I is connected with the pulse cleaning device I through a support plate I; and one end of the scraping wall spring II is connected with the pulse cleaning device II through a support plate II.
[0007] Both the pulse cleaning device I and the pulse cleaning device II include a hydraulic power system, a support frame, and a transmission shaft. The hydraulic power system is connected to the transmission shaft through a transition flange. The support frame is fixedly connected to the end cover I or the end cover II. A connecting frame is provided at the front of the transmission shaft, and a proximity block is connected to the connecting frame through a fixing frame. A magnetic induction proximity switch is provided near the proximity block, and both the magnetic induction proximity switch and the hydraulic power system are connected to the central control room. A guide sleeve is provided between the front part of the transmission shaft and the support frame. A bearing system is provided between the middle part of the transmission shaft and the support frame. A sealing cavity is provided between the rear part of the transmission shaft and the support frame, and a sealing sleeve is provided between the sealing cavity and the transmission shaft.
[0008] A support plate I is fixed on the transmission shaft in the pulse cleaning device I, and a support I for the support plate is provided at the bottom of the support plate I. The support I for the support plate is fixed on the partition plate of the heat exchanger.
[0009] A support plate II is fixed on the transmission shaft in the pulse cleaning device II, and a support II for the support plate is provided at the bottom of the support plate II. The support II for the support plate is fixed on the tube box housing of the heat exchanger.
[0010] The present invention has the following advantages compared with the prior art:
[0011] 1. Pulse cleaning devices are provided at both ends of the heat exchanger in the present invention. Scraping wall springs are provided in all heat exchange tubes. One end of the scraping wall spring is connected to the pulse cleaning device through a support plate. At the same time, a magnetic induction proximity switch is provided, and both the magnetic induction proximity switch and the hydraulic power system in the pulse cleaning device are connected to the central control room. Therefore, online reciprocating motion and real-time cleaning can be achieved, so as to realize the long-term stable operation of the equipment.
[0012] 2. In the present invention, the pulse cleaning device is connected to its respective hydraulic power system through a transition flange and a transmission shaft, and can be driven and controlled according to a set program.
[0013] 3. A sealing cavity is provided between the rear part of the transmission shaft of the pulse cleaning device in the present invention and the support frame, and a sealing sleeve is provided between the sealing cavity and the transmission shaft. Through the combined sealing, the sealing performance of the equipment is more reliable.
[0014] 4. A guide sleeve and a bearing system are provided between the transmission shaft of the pulse cleaning device in the present invention and the support frame, which can maintain the precise linear reciprocating motion of the transmission shaft.
[0015] 5. A connecting frame, a fixing frame, and a proximity block are fixed on the transmission shaft of the pulse cleaning device in the present invention, which can be used to monitor and feedback motion signals in real time.
[0016] 6. The present invention is applicable to high-viscosity media, can effectively remove the heat of high-viscosity media, make the concentration and temperature distribution of the polymerization reaction liquid uniform, and thus greatly improve the quality of polymer products. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The following further describes in detail the specific embodiments of the present invention with reference to the drawings.
[0018] Figure 1 It is a schematic structural diagram of the present invention.
[0019] Figure 2 It is a schematic structural diagram of the pulse cleaning device in the present invention.
[0020] In the figure: 1 - Pulse cleaning device I, 2 - End cover I, 3 - Support plate I, 4 - Scraping wall spring I, 5 - Heat exchanger, 6 - Pulse cleaning device II, 7 - End cover II, 8 - Support plate II, 9 - Support plate support I, 10 - Scraping wall spring II, 11 - Support plate support II, 12 - Hydraulic power system, 13 - Transition flange, 14 - Guide sleeve, 15 - Connecting frame, 16 - Fixed frame, 17 - Proximity block, 18 - Support frame, 19 - Bearing system, 20 - Sealing cavity, 21 - Sealing sleeve, 22 - Transmission shaft. SPECIFIC EMBODIMENTS
[0021] As Figures 1 - 2 shown, a scraping wall heat exchanger includes a heat exchanger 5. One upper end of the heat exchanger 5 is connected with a pulse cleaning device I 1 through an end cover I 2, and the other lower end is connected with a pulse cleaning device II 6 through an end cover II 7; scraping wall springs I 4 are arranged in all the heat exchange tubes in the upper part inside the heat exchanger 5, and scraping wall springs II 10 are arranged in all the heat exchange tubes in the lower part; one end of the scraping wall spring I 4 is connected with the pulse cleaning device I 1 through a support plate I 3; one end of the scraping wall spring II 10 is connected with the pulse cleaning device II 6 through a support plate II 8.
[0022] Among them: both the pulse cleaning device I 1 and the pulse cleaning device II 6 include a hydraulic power system 12, a support frame 18 and a transmission shaft 22; the hydraulic power system 12 is connected with the transmission shaft 22 through a transition flange 13; the support frame 18 is fixedly connected with the end cover I 2 or the end cover II 7; a connecting frame 15 is arranged at the front part of the transmission shaft 22, and the connecting frame 15 is connected with a proximity block 17 through a fixed frame 16; a magnetic induction type proximity switch is arranged near the proximity block 17, and both the magnetic induction type proximity switch and the hydraulic power system 12 are connected with the central control room; a guide sleeve 14 is arranged between the front part of the transmission shaft 22 and the support frame 18; a bearing system 19 is arranged between the middle part of the transmission shaft 22 and the support frame 18; a sealing cavity 20 is arranged between the rear part of the transmission shaft 22 and the support frame 18, and a sealing sleeve 21 is arranged between the sealing cavity 20 and the transmission shaft 22.
[0023] On the transmission shaft 22 in the pulse cleaning device I 1, a support plate I 3 is fixed, and a support I 9 for the support plate is provided at the bottom of the support plate I 3; the support I 9 for the support plate is fixed on the partition plate of the heat exchanger 5.
[0024] On the transmission shaft 22 in the pulse cleaning device II 6, a support plate II 8 is fixed, and a support II 11 for the support plate is provided at the bottom of the support plate II 8; the support II 11 for the support plate is fixed on the tube box housing of the heat exchanger 5.
[0025] The hydraulic power system 12 includes but is not limited to the following functional components: hydraulic cylinder A at the left end, electromagnetic directional control valve A, magnetic induction proximity switch LS1 and magnetic induction proximity switch LS2, hydraulic cylinder B at the right end, electromagnetic directional control valve B, magnetic induction proximity switch LS3 and magnetic induction proximity switch LS4.
[0026] During operation, the two hydraulic cylinders at the left and right ends drive their respective support plates I 3 and support plates II 8 to reciprocate, so as to achieve the purpose of on-line cleaning of the scraping wall spring I 4 and the scraping wall spring II 10 in the heat exchange tubes. After the hydraulic power system 12 is started, the hydraulic cylinder A acts at a set speed to make a pushing action on the left support plate I 3 and the scraping wall spring I 4. When the magnetic induction proximity switch LS1 detects the left proximity block 17, the electromagnetic directional control valve A acts, and the hydraulic cylinder A starts to drive the support plate I 3 and the scraping wall spring I 4 to return at a set speed; when the magnetic induction proximity switch LS2 detects the left proximity block 17, the hydraulic cylinder A stops acting, and the hydraulic cylinder B starts to act to make a pushing action on the right support plate II 8 and the scraping wall spring II 10. When the magnetic induction proximity switch LS3 detects the right proximity block 17, the electromagnetic directional control valve B acts, and the hydraulic cylinder B starts to drive the support plate II 8 and the scraping wall spring II 10 to return at a set speed; when the magnetic induction proximity switch LS4 detects the right proximity block 17, the hydraulic cylinder B stops acting, and the hydraulic cylinder A enters the second action, and so on in a cycle.
Claims
1. A scraping wall type heat exchanger, comprising a heat exchanger (5), characterized in that: One end of the upper part of the heat exchanger (5) is connected to a pulse cleaning device I (1) through an end cover I (2), and the other end of the lower part is connected to a pulse cleaning device II (6) through an end cover II (7); scraping wall springs I (4) are arranged in all the heat exchange tubes in the upper part of the heat exchanger (5), and scraping wall springs II (10) are arranged in all the heat exchange tubes in the lower part; one end of the scraping wall spring I (4) is connected to the pulse cleaning device I (1) through a support plate I (3); one end of the scraping wall spring II (10) is connected to the pulse cleaning device II (6) through a support plate II (8), and both the pulse cleaning device I (1) and the pulse cleaning device II (6) include a hydraulic power system (12), a support frame (18) and a transmission shaft (22); the hydraulic power system (12) is connected to the transmission shaft (22) through a transition flange (13); the support frame (18) is fixedly connected to the end cover I (2) or the end cover II (7); a connecting frame (15) is arranged at the front part of the transmission shaft (22), and a proximity block (17) is connected to the connecting frame (15) through a fixing frame (16); a magnetic induction type proximity switch is arranged near the proximity block (17), and both the magnetic induction type proximity switch and the hydraulic power system (12) are connected to a central control room; a guide sleeve (14) is arranged between the front part of the transmission shaft (22) and the support frame (18); a bearing system (19) is arranged between the middle part of the transmission shaft (22) and the support frame (18); a sealing cavity (20) is arranged between the rear part of the transmission shaft (22) and the support frame (18), and a sealing sleeve (21) is arranged between the sealing cavity (20) and the transmission shaft (22).
2. The scraping wall type heat exchanger according to claim 1, wherein: A support plate I (3) is fixed on the transmission shaft (22) in the pulse cleaning device I (1), and a support I (9) for the support plate is arranged at the bottom of the support plate I (3); the support I (9) for the support plate is fixed on the partition plate of the heat exchanger (5).
3. The scraping wall type heat exchanger according to claim 1, wherein: A support plate II (8) is fixed on the transmission shaft (22) in the pulse cleaning device II (6), and a support II (11) for the support plate is arranged at the bottom of the support plate II (8); the support II (11) for the support plate is fixed on the tube box shell of the heat exchanger (5).
Citation Information
Patent Citations
Spiral scale-eliminating device with heat-exchange intensifying function
CN1033873A
Wall scraping type heat exchanger
CN214223861U