A high-pressure PTA slurry heater

Abstract

The present invention relates to a high-pressure PTA slurry heater, comprising: an expansion joint; a shell; a tube bundle assembly disposed within the shell; a tube sheet covering both ends of the shell; a pipe communicating with the tube bundle assembly; a pipe box connecting the ends of the pipe; and a pipe cover pressing and fixing the pipe box. The pipe box is located between the pipe cover and the tube sheet; the pipe cover is fixedly connected to the tube sheet and the pipe box, respectively; the expansion joint is connected and disposed in the middle of the shell; the tube sheet is provided with a sealing groove; a sealing member is installed in the sealing groove; and the pipe box is embedded in the sealing groove and presses the sealing member. The heater solves the problem in existing solutions that the heater is subjected to high pressure, causing looseness between components, affecting the operation of the heater, and that PTA slurry is clogged in loose areas, making it difficult to disassemble and replace components.

Description

Technical Field

[0001] The present invention relates to the field of heaters, in particular to a high-pressure PTA slurry heater. Background Art

[0002] Purified terephthalic acid (PTA) is an important raw material for the production of polyester. Its industrial production mainly uses crude terephthalic acid (TA) produced by liquid-phase air oxidation of p-xylene (PX), which is then further hydrogenated and refined.

[0003] The PTA slurry heater is located in the refining unit of the PTA device. The PTA slurry is fed into the heater through a feed booster pump, and the slurry is heated step by step in the heater.

[0004] Due to the high viscosity and pressure of PTA slurry, the heater is subjected to significant pressure when it enters the heater. This can cause increasing vibration between components, leading to loose components and affecting heater operation. Due to the high viscosity of PTA slurry, when PTA slurry is stuck in loose locations, it can be difficult to remove and replace components.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0006] In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a high-pressure PTA slurry heater to solve the problem in the prior art that the heater is subjected to high pressure, causing looseness between components, PTA slurry filling the loose places, and affecting the operation of the heater.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] A high-pressure PTA slurry heater;

[0009] The invention comprises: an expansion joint; a shell; a tube bundle assembly arranged in the shell; a tube sheet covering both ends of the shell; a pipe connecting the tube bundle assembly; a pipe box connecting the ends of the pipe; a pipe cover pressing and fixing the pipe box; wherein the pipe box is located between the pipe cover and the tube sheet; the pipe cover is fixedly connected to the tube sheet and the pipe box respectively; the expansion joint is connected and arranged in the middle position of the shell; a sealing groove is provided on the tube sheet; a sealing member is installed in the sealing groove; the pipe box is embedded in the sealing groove and presses the sealing member.

[0010] A further technical solution is that the expansion joint includes: an expansion block, which is relatively arranged in the middle position of the shell; a pull rod, which pulls the expansion blocks relatively close; a cavity, which is formed between the relative expansion blocks; an expansion tube, which is placed in the cavity and connects the relative expansion blocks; an inner tube, which is connected between the relative expansion blocks; wherein, the inner tube shields the expansion tube and transitions to the expansion block; the pull rod pulls the expansion blocks relatively close.

[0011] A further technical solution is that a protrusion is provided on the pipe box, the protrusion is embedded in the sealing groove and presses the seal; a cavity is opened on the side of the pipe box close to the tube sheet; and the cavity gradually expands outward.

[0012] A further technical solution is that the pipe box and the pipe cover are connected by a stabilizing member; one end of the stabilizing member passes through the pipe cover; the other end of the stabilizing member is placed on the pipe box; a first locking member is threadedly connected to the stabilizing member; the first locking member is tightened, and the first locking member pulls the stabilizing member to press the pipe box.

[0013] A further technical solution is that the tube sheet and the tube cover clamp the tube box via an adjusting piece; the adjusting piece pulls the tube sheet and the tube cover closer to each other and compresses the sealing piece.

[0014] A further technical solution is that the tube bundle assembly is arranged obliquely in the shell, and the tube bundle assembly is connected to the tube boxes at both ends of the shell.

[0015] A further technical solution is that heating devices are respectively provided in the pipe box and in the shell at positions away from the pipeline; temperature measuring devices are respectively provided in the pipe box and in the shell; and the temperature measuring devices regulate the heating devices.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: (1) the center position of the convex portion corresponds to the position of the bump; the bump on the convex portion and the bump on the sealing groove are offset from each other; when the bump presses the seal, the stress deformation at the center position of the convex portion is the largest, and the stress deformation gradually decreases from the center position of the convex portion to the edge position; the deformation of the convex portion makes the convex portion fit tightly against the convex portion and the sealing groove, completing the sealing between the tube box and the tube sheet; after the convex portion is deformed, the seal is squeezed and extended, so that the seal can fill the space between the convex portion and the sealing groove; the slurry cannot enter the space between the convex portion and the sealing groove, thereby improving the sealing performance of the tube box.

[0017] (2) After tightening the first locking member, the annular member and the three sets of pressing parts are pulled by the stabilizing rod. The three sets of pressing parts press the pipe box, so that the pipe box is in a plane vertical state; the pressure of the protrusions on the pipe box on the seal will be evenly distributed, thereby ensuring the sealing performance of the seal; at the same time, the installation tilt of the pipe box is avoided, which leads to the appearance of installation gaps between the pipe box, the pipe cover and the tube sheet.

[0018] (3) As the cavity gradually expands outward, a sealing member is provided at the edge of the cavity. The structural strength of the edge of the cavity is relatively weak, and the tension generated by the adjusting member causes the edge of the cavity to deform, so that the edge of the cavity is in a taut state and can withstand the pressure of the slurry;

[0019] There is a temperature difference between the slurries in the two groups of pipelines, and the temperature influence between the slurries is reduced by the cavity; at the same time, the slurry pressure is high, which will have a greater impact on the components during transportation, causing loosening and shaking between the components. Part of the shaking is absorbed by the cavity, reducing the impact of the slurry pressure on the high-pressure PTA slurry heater components.

[0020] (4) The slurry enters the lower mixing chamber to complete the first mixing. As the slurry in the lower mixing chamber increases, the slurry flows from the lower mixing chamber to the upper mixing chamber to complete the second mixing. Finally, the slurry flows into the upper tube bundle assembly. Through the two mixing processes, the slurry is heated evenly.

[0021] Due to the high slurry pressure, when the slurry enters the tube bundle assembly and the pipe box, the tube bundle assembly and the mixing chamber need to withstand a certain pressure. In order to avoid cracks or breakage in the tube bundle assembly and gaps between the pipe box and the tube sheet, the deformation cavity allows the mixing chamber to shrink and expand to a certain extent, so that the mixing chamber can withstand a certain pressure of the slurry, avoiding cracks or breakage in the tube bundle assembly and gaps between the pipe box and the tube sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a high-pressure PTA slurry heater according to an embodiment of the present invention is shown.

[0023] Figure 2 Shown Figure 1 Enlarged structural diagram at point A in the middle.

[0024] Figure 3 A side structural diagram of a sealing member according to an embodiment of the present invention is shown.

[0025] Figure 4 The figure shows a left side structural diagram of a pipe box according to an embodiment of the present invention.

[0026] Figure 5 Shown Figure 1 Enlarged structural diagram at point B in the middle.

[0027] Figure 6 An enlarged structural diagram of an expansion joint according to an embodiment of the present invention is shown.

[0028] Markings in the accompanying drawings: 1. shell; 10. heating device; 101. temperature measuring device; 11. partition; 2. tube bundle assembly; 3. tube sheet; 4. pipeline; 5. tube box; 51. protrusion; 511. annular space; 512. opening; 513. cone; 514. inclined surface; 52. cavity; 53. mixing chamber; 54. deformation chamber; 6. pipe cover; 7. expansion joint; 71. expansion block; 72. pull rod; 73. cavity; 74. expansion tube; 741. arc segment; 742. connecting section; 75. inner tube; 8. sealing groove; 81. sealing member; 82. stabilizing member; 821. annular member; 822. stabilizing rod; 823. pressing part; 83. first locking member; 84. convex portion; 85. protrusion; 9. adjusting member; 91. screw; 92. second locking member. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention clearer, the device proposed in the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the efficacy and purpose that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0030] Figure 1 A schematic structural diagram of a high-pressure PTA slurry heater according to an embodiment of the present invention is shown. Figure 2 Shown Figure 1 Enlarged structural diagram at point A in the middle. Figure 3 A side structural diagram of a sealing member according to an embodiment of the present invention is shown. Figure 4 The figure shows a left side structural diagram of a pipe box according to an embodiment of the present invention. Figure 5 Shown Figure 1 The enlarged structure diagram of B in the middle. Figure 1-Figure 5 As shown, the present invention discloses a high-pressure PTA slurry heater.

[0031] The high-pressure PTA slurry heater includes: a shell 1 arranged in the left and right directions, an expansion joint 7 connected to the middle position of the shell 1, a tube bundle assembly 2 arranged in the shell 1, a tube sheet 3 covering the left and right ends of the shell 1, a pipe 4 connected to the left end of the tube bundle assembly 2, a pipe box 5 connecting the end of the pipe 4 and a pipe cover 6 that presses and fixes the pipe box 5.

[0032] The tube box 5 is located between the tube cover 6 and the tube sheet 3. The tube cover 6 securely connects the tube sheet 3 and the tube box 5. A sealing groove 8 is defined on the side of the tube sheet 3 near the tube box 5. A seal 81 is installed within the sealing groove 8. When the tube box 5 contacts the tube sheet 3, it fits into the sealing groove 8 and compresses the seal 81.

[0033] The tube box 5 is provided with a protrusion 51 on the side close to the tube sheet 3. When the tube box 5 contacts the tube sheet 3, the protrusion 51 engages with the sealing groove 8 and presses the seal 81. The tube box 5 is provided with a cavity 52 on the side close to the tube sheet 3, and the cavity 52 gradually expands outward.

[0034] For example, the seal 81 is strip-shaped. The contact surface of the seal 81 is formed with an annular protrusion 84 that gradually spreads outward. A protrusion 85 is arranged side by side on the protrusion 51 and the sealing groove 8. When the protrusion 51 is embedded in the sealing groove 8, the protrusion 85 presses the seal 81.

[0035] The center position of protrusion 84 corresponds to the position of bump 85. The bump 85 on protrusion 51 and the bump 85 on sealing groove 8 are offset from each other. When bump 85 presses against seal 81, the center position of protrusion 84 experiences the greatest force and deformation, and the force and deformation gradually decrease from the center position of protrusion 84 toward the edge. The deformation of protrusion 84 allows it to fit tightly against protrusion 51 and sealing groove 8, completing the seal between tube box 5 and tube sheet 3. After protrusion 84 deforms, seal 81 is squeezed and extended, allowing it to completely fill the space between protrusion 51 and sealing groove 8. Slurry cannot enter the space between protrusion 51 and sealing groove 8, thereby improving the sealing performance of tube box 5.

[0036] While improving the sealing performance, there is no rigid connection between the protrusion 51 and the sealing groove 8. After the seal 81 is squeezed, the density inside the seal 81 increases, the seal 81 has a certain elasticity, and the seal 81 has a certain shock-absorbing effect, which reduces the impact of the slurry pressure on the high-pressure PTA slurry heater components.

[0037] The seal 81 is compressed by the protrusion 85 to restrict the seal 81 and prevent the seal 81 from shifting, so that the seal 81 continuously forms a sealing and shock-absorbing effect.

[0038] The size of the bumps 85 is positively correlated with the thickness of the seal 81 , and the distribution density of the bumps 85 is negatively correlated with the size of the bumps 85 . The pressure of the slurry is positively correlated with the size of the bumps 85 and the thickness of the seal 81 .

[0039] When seal 81 is thick and protrusions 85 are small, the squeezing force exerted by protrusions 85 on seal 81 is weak, and protrusions 85 are unable to secure seal 81. Deformation of seal 81 prevents seal 81 from filling the gap between protrusion 51 and sealing groove 8. When protrusions 85 are large and densely distributed, protrusions 85 on protrusion 51 and sealing groove 8 can shear seal 81, damaging the sealing performance of seal 81. When the slurry pressure is high, the size of protrusions 85 and the thickness of seal 81 need to be increased to improve sealing performance.

[0040] The thicker the seal 81, the larger the bumps 85. The thinner the seal 81, the smaller the bumps 85. The larger the bumps 85, the sparser their distribution density. The smaller the bumps 85, the denser their distribution density. The greater the slurry pressure, the larger the bumps 85 and the thicker the seal 81. The smaller the slurry pressure, the smaller the bumps 85 and the thinner the seal 81.

[0041] The pipe box 5 and the pipe cover 6 are connected by a stabilizing member 82. One end of the stabilizing member 82 passes through the pipe cover 6. The other end of the stabilizing member 82 is placed on the pipe box 5. The first locking member 83 is threadedly connected to the stabilizing member 82.

[0042] The stabilizing member 82 includes an annular member 821 and stabilizing rods 822 spaced apart along the annular member 821. The stabilizing rods 822 extend through the pipe cover 6. In an exemplary embodiment, three stabilizing rods 822 are provided. The annular member 821 is placed on the pipe box 5. The stabilizing rods 822 are threadedly connected to the first locking member 83. In an exemplary embodiment, the first locking member 83 is a nut. When the first locking member 83 is tightened, it pulls the stabilizing member 82 against the pipe box 5.

[0043] A pressing portion 823 is provided on the annular member 821. The pipe box 5 forms an annular space 511. Openings 512 are defined on the end surface of the pipe box 5 near the pipe cover 6. The openings 512 are spaced apart along the annular space 511. The annular space 511 communicates with the openings 512. A tapered surface 513 is defined around the pressing portion 823. An inclined surface 514 is defined along the annular space 511.

[0044] The pressing portion 823 is placed in the annular space 511 through the opening 512 , and the annular member 821 is rotated at a certain angle so that the pressing portion 823 is placed in the annular space 511 . At this time, the conical surface 513 is in contact with the inclined surface 514 .

[0045] For example, there are three sets of pressing parts 823. After tightening the first locking member 83, the stabilizing rod 822 pulls the annular member 821 and the three sets of pressing parts 823. The three sets of pressing parts 823 compress the pipe box 5, keeping it in a flat, vertical position. This evenly distributes the pressure of the protrusions 85 on the pipe box 5 against the seal 81, ensuring the sealing performance of the seal 81. This also prevents the pipe box 5 from tilting during installation, which could result in installation gaps between the pipe box 5, the pipe cover 6, and the tube sheet 3.

[0046] The tube sheet 3 and tube cover 6 clamp the tube box 5 together via an adjustment member 9. The adjustment member 9 includes a screw 91 and a second locking member 92. After the screw 91 passes through the tube sheet 3 and tube cover 6, the second locking member 92 is screwed into the screw 91, causing the adjustment member 9 to pull the tube sheet 3 and tube cover 6 closer together and compress the seal 81.

[0047] The locking force of the second locking member 92 is positively correlated with the thickness of the seal 81. The thicker the seal 81, the greater the locking force of the second locking member 92. The thinner the seal 81, the smaller the locking force of the second locking member 92. The locking force of the second locking member 92 clamps the tube sheet 3 and the tube cover 6 to the tube box 5, squeezing the seal 81 between the protrusion 51 and the sealing groove 8.

[0048] As the cavity 52 gradually expands outward, a sealing member 81 is provided at the edge of the cavity 52. ​​The structural strength of the edge of the cavity 52 is relatively weak, and the tension generated by the adjusting member 9 will cause the edge of the cavity 52 to deform, so that the edge of the cavity 52 is in a taut state and can withstand the pressure of the slurry.

[0049] For example, there are two sets of pipes 4. One set of pipes 4 flows the slurry in, while the other set flows the slurry out. A cavity 52 is located between the two sets of pipes 4. The slurry in the two sets of pipes 4 has a temperature difference, and the cavity 52 reduces the temperature impact between the two sets of pipes 4. Furthermore, the high pressure of the slurry can significantly impact components during transportation, causing loosening and vibration. The cavity 52 absorbs some of this vibration, reducing the impact of the slurry pressure on the high-pressure PTA slurry heater components.

[0050] At the same time, only the second locking member 92 needs to be tightened to re-establish a tight seal between the tube box 5, the tube sheet 3, and the tube cover 6. By calculating the tightening force applied by the second locking member 92, the bearing limit of the seal 81 can be calculated, making it easier to replace the seal 81 in advance.

[0051] The degree of outward expansion of the cavity 52 is related to the locking force of the second locking member 92, the pressure of the slurry, and the temperature difference between the slurries.

[0052] The more gradually the cavity 52 expands outward, the greater the locking force of the second locking member 92 the pipe box 5 bears, the greater the pressure of the slurry it bears, and the smaller the temperature difference between the slurries it bears.

[0053] The steeper the outward expansion of the cavity 52 is, the smaller the locking force of the second locking member 92 is on the pipe box 5 , the smaller the pressure on the slurry is on the pipe box 5 , and the greater the temperature difference between the slurries is on the pipe box 5 .

[0054] The tube bundle assembly 2 is tiltedly arranged in the shell 1 , and the tube bundle assembly 2 is connected to the pipe boxes 5 at both ends of the shell 1 .

[0055] Exemplarily, there are two tube bundle assemblies 2. The right side of the lower tube bundle assembly 2 is tilted upward, and the left side of the upper tube bundle assembly 2 is tilted upward. The tube bundle assembly 2 includes parallel tube bundles fixed by connecting plates.

[0056] The degree of inclination of tube bundle assembly 2 is related to the temperature difference between the slurry and the heat transfer medium. Tilting tube bundle assembly 2 is used to slow the slurry flow rate. When the temperature difference between the slurry and the heat transfer medium is large, a larger inclination of tube bundle assembly 2 can significantly reduce the slurry flow rate, resulting in a larger temperature rise during slurry flow. When the temperature difference between the slurry and the heat transfer medium is small, a smaller inclination of tube bundle assembly 2 can slightly reduce the slurry flow rate, resulting in a smaller temperature rise during slurry flow.

[0057] The right-side manifold 5 forms a mixing chamber 53. Exemplarily, there are two groups of mixing chambers 53. Mixing chambers 53 are distributed vertically and interconnected. Deformation chambers 54 are formed between adjacent mixing chambers 53. Deformation chambers 54 and mixing chambers 53 are disposed opposite each other.

[0058] After the slurry in the lower tube bundle assembly 2 enters the lower mixing chamber 53 and is mixed, it enters the upper mixing chamber 53 and then enters the upper tube bundle assembly 2. The high pressure during slurry feeding results in a high slurry flow rate. The slurry itself has a certain viscosity, and the tube bundle assembly 2 has a certain inclination angle, which somewhat slows the slurry flow rate. However, the tube bundles within the tube bundle assembly 2 are arranged in parallel. Therefore, the slurry in different tube bundles within the tube bundle assembly 2 experiences different heating effects.

[0059] The slurry enters the lower mixing chamber 53 to complete the first mixing. As the slurry in the lower mixing chamber 53 increases, the slurry flows from the lower mixing chamber 53 to the upper mixing chamber 53 to complete the second mixing. Finally, the slurry flows into the upper tube bundle assembly 2. Through the two mixing processes, the slurry is heated evenly.

[0060] Due to the high slurry pressure, when the slurry enters the tube bundle assembly 2 and the tube box 5, the tube bundle assembly 2 and the mixing chamber 53 need to withstand a certain pressure. To prevent cracks or fractures in the tube bundle assembly 2 and the formation of gaps between the tube box 5 and the tube sheet 3, the deformation chamber 54 allows the mixing chamber 53 to contract and expand to a certain extent. This allows the mixing chamber 53 to withstand a certain amount of slurry pressure, thereby preventing cracks or fractures in the tube bundle assembly 2 and the formation of gaps between the tube box 5 and the tube sheet 3. The deformation range and degree of the deformation chamber 54 can be flexibly adjusted according to the slurry pressure in the tube bundle assembly 2.

[0061] The size of the deformation chamber 54 is related to the slurry pressure. The larger the deformation chamber 54, the greater the degree to which the mixing chamber 53 can contract and expand, and the greater the slurry pressure the mixing chamber 53 can withstand. The smaller the deformation chamber 54, the less the degree to which the mixing chamber 53 can contract and expand, and the less slurry pressure the mixing chamber 53 can withstand.

[0062] Figure 6 The enlarged structural diagram of the expansion joint according to the embodiment of the present invention is shown. Figures 1-6 As shown:

[0063] The expansion joint 7 includes: an expansion block 71 relatively arranged in the middle position of the shell 1, a pull rod 72 that pulls the expansion block 71 relatively close, a cavity 73 formed between the opposing expansion blocks 71, an expansion tube 74 placed in the cavity 73 and connecting the opposing expansion blocks 71, and an inner tube 75 connected between the opposing expansion blocks 71. The inner tube 75 shields the expansion tube 74 and transitions to the expansion block 71. Exemplarily, the expansion blocks 71 are provided in two groups. The expansion tube 74 includes an arc segment 741 and a connecting segment 742. The connecting segment 742 is connected to the left and right ends of the arc segment 741. The arc segment 741 is placed in the cavity 73, and the connecting segment 742 connects to the expansion block 71. The inner surface of the inner tube 75 smoothly transitions to the inner surface of the expansion block 71. The inner surface of the expansion block 71 smoothly transitions to the inner surface of the shell 1. A notch is formed in the inner tube 75 to connect the expansion tube 74 and the shell 1.

[0064] Both ends of the pull rod 72 are threadedly connected to nuts. By adjusting the nuts on the pull rod 72 to push the expansion blocks 71 closer to or farther away from each other, the size of the cavity 73 is adjusted, thereby controlling the expansion degree of the expansion tube 74.

[0065] The higher the temperature of the heat transfer medium, the larger the space of the cavity 73. The lower the temperature of the heat transfer medium, the smaller the space of the cavity 73.

[0066] Baffles 11 are installed within the shell 1 to redirect the heat transfer medium. These baffles 11 are spaced relative to each other, located above the tube bundle assembly 2. When the heat transfer medium is in a gaseous state, the baffles 11 bend back and forth along the baffles, redirecting its flow. This prolongs the contact time between the gaseous heat transfer medium and the tube bundle assembly 2 above, ensuring sufficient heating of the slurry.

[0067] The cross-section of the partition 11 located at the lower tube bundle assembly 2 is arc-shaped. The partition 11 is arranged along the lower tube bundle assembly 2. The gaseous heat transfer medium is cooled and liquefied and flows into the partition 11 located at the lower tube bundle assembly 2. The liquid heat transfer medium flows along the partition 11 and immerses the tube bundle assembly 2.

[0068] A heating device 10 is provided in the tube box 5 and in the shell 1 at a position away from the pipe 4. The heating device 10 contacts a partition 11 located at the position of the tube bundle assembly 2 below.

[0069] Temperature measuring devices 101 are respectively provided in the pipe box 5 and the shell 1. The temperature measuring devices 101 detect the temperature of the slurry in the left pipe box 5, the temperature of the slurry in the right pipe box 5, and the temperature of the heat transfer medium in the shell 1.

[0070] The temperature measuring device 101 adjusts the heating device 10. The temperature measuring device 101 controls the switch of the heating device 10 and the power of the heating device 10 according to the measured temperature.

[0071] The temperature measuring device 101 can measure the temperature of the slurry feed, the temperature of the slurry mixing, the temperature of the slurry discharge and the temperature of the heat transfer medium.

[0072] When the temperature difference between the slurry mixing temperature and the slurry feed temperature is small, it indicates that the temperature of the liquid heat transfer medium is low. The temperature of the liquid heat transfer medium is calculated based on the detected temperature of the heat transfer medium. In order to ensure the stability of the slurry discharge temperature, the liquid heat transfer medium is heated by the heating device 10 so that the liquid heat transfer medium has sufficient heat to transfer to the slurry.

[0073] When the temperature difference between the slurry mixing temperature and the slurry feed temperature is large, it indicates that the temperature of the liquid heat transfer medium is high. The temperature of the liquid heat transfer medium is calculated by the detected temperature of the heat transfer medium. At this time, in order to ensure the stability of the slurry discharge temperature, the heating device 10 is turned off.

[0074] If the slurry discharge temperature does not reach the required temperature and the temperature difference between the slurry mixing temperature and the slurry feed temperature is within a reasonable range, it indicates that the temperature of the gaseous heat transfer medium is low. The temperature of the gaseous heat transfer medium is calculated based on the detected temperature of the heat transfer medium. In order to ensure the stability of the slurry discharge temperature, the power of the heating device 10 is increased so that the heating device 10 not only heats the liquid heat transfer medium, but also vaporizes a portion of the liquid heat transfer medium into the gaseous heat transfer medium, so that the liquid heat transfer medium and the gaseous heat transfer medium simultaneously transfer heat to the slurry.

[0075] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A high-pressure PTA slurry heater, characterized in that: include: Expansion joints (7); housing (1); A tube bundle assembly (2) is arranged in the shell (1); Tube plates (3) covering both ends of the shell (1); A pipeline (4) connected to the tube bundle assembly (2); A pipe box (5) connected to the end of the pipe (4); A pipe cover (6) is used to press and fix the pipe box (5); The pipe box (5) is located between the pipe cover (6) and the tube sheet (3); the pipe cover (6) is fixedly connected to the tube sheet (3) and the pipe box (5); the expansion joint (7) is arranged in a middle position of the shell (1); the tube sheet (3) is provided with a sealing groove (8); a sealing member (81) is installed in the sealing groove (8); the pipe box (5) is embedded in the sealing groove (8) and presses the sealing member (81); The pipe box (5) and the pipe cover (6) are connected via a stabilizing member (82); one end of the stabilizing member (82) passes through the pipe cover (6); the other end of the stabilizing member (82) is placed on the pipe box (5); a first locking member (83) is threadedly connected to the stabilizing member (82); when the first locking member (83) is tightened, the first locking member (83) pulls the stabilizing member (82) to press the pipe box (5); The stabilizing member (82) includes an annular member (821) and stabilizing rods (822) spaced apart along the annular member (821); the stabilizing rods (822) pass through the pipe cover (6); the annular member (821) is placed in the pipe box (5); A pressing portion (823) is provided on the annular member (821); the pipe box (5) forms an annular space (511); an opening (512) is provided on the end surface of the pipe box (5) close to the pipe cover (6); the annular space (511) is connected to the opening (512); a conical surface (513) is provided around the pressing portion (823); and an inclined surface (514) is provided along the annular space (511); Place the pressing portion (823) in the annular space (511) through the opening (512), and rotate the annular member (821) at a certain angle so that the pressing portion (823) is placed in the annular space (511), and the conical surface (513) fits the inclined surface (514); The size of the protrusion (85) is positively correlated with the thickness of the sealing member (81); the pressure of the slurry is positively correlated with the size of the protrusion (85) and the thickness of the sealing member (81); the pipe box (5) located on the right side forms a mixing chamber (53); and a deformation chamber (54) is formed between adjacent mixing chambers (53); The contact surface of the sealing member (81) forms an annular convex portion (84) that gradually spreads outward; the convex portion (51) and the sealing groove (8) are provided with a convex block (85) in parallel; when the convex portion (51) is embedded in the sealing groove (8), the convex block (85) presses the sealing member (81); the center position of the convex portion (84) corresponds to the position of the convex block (85); the convex block (85) on the convex portion (51) and the convex block (85) on the sealing groove (8) are offset from each other; the convex block (85) is pressed tightly When the sealing member (81) is sealed, the center of the convex portion (84) is deformed by force, and the deformation of the convex portion (84) from the center to the edge gradually decreases; the deformation of the convex portion (84) makes the convex portion (84) closely fit the convex portion (51) and the sealing groove (8), completing the sealing between the tube box (5) and the tube sheet (3); after the deformation of the convex portion (84), the sealing member (81) is squeezed and extended, and the sealing member (81) fills the space between the convex portion (51) and the sealing groove (8); The mixing chambers (53) are divided into two groups, which are distributed in an upper and lower manner and are interconnected. A deformation chamber (54) is formed between adjacent mixing chambers (53), and the deformation chamber (54) and the mixing chamber (53) are arranged relative to each other. The slurry enters the lower mixing chamber (53) to complete the first mixing, and the slurry in the lower mixing chamber (53) increases. The slurry flows from the lower mixing chamber (53) into the upper mixing chamber (53) to complete the second mixing, and the slurry then flows into the upper tube bundle assembly (2). The deformation chamber (54) causes the mixing chamber (53) to contract and expand to a certain extent. The mixing chamber (53) can withstand a certain pressure of the slurry, thereby preventing cracks or breakage of the tube bundle assembly (2) and the formation of gaps between the tube box (5) and the tube sheet (3).

2. The high pressure PTA slurry heater according to claim 1, wherein The expansion joint (7) comprises: An expansion block (71) is relatively arranged in the middle position of the housing (1); A pull rod (72) pulls the expansion block (71) relatively closer; a cavity (73) formed between the opposing expansion blocks (71); an expansion tube (74), disposed in the cavity (73) and connected to the opposite expansion block (71); An inner tube (75) connected between the expansion blocks (71); The inner tube (75) shields the expansion tube (74) and transitions to the expansion block (71); the pull rod (72) pulls the expansion block (71) relatively closer.

3. The high pressure PTA slurry heater according to claim 2, characterized in that A protrusion (51) is provided on the pipe box (5), and the protrusion (51) is embedded in the sealing groove (8) and presses the sealing member (81); a cavity (52) is provided on the pipe box (5) on a side close to the tube sheet (3); and the cavity (52) gradually expands outward.

4. The high pressure PTA slurry heater according to claim 2, characterized in that The tube sheet (3) and the tube cover (6) clamp the tube box (5) via an adjusting member (9); the adjusting member (9) pulls the tube sheet (3) and the tube cover (6) closer to each other and compresses the sealing member (81).

5. The high pressure PTA slurry heater according to claim 2, characterized in that The tube bundle assembly (2) is arranged obliquely in the shell (1), and the tube bundle assembly (2) is connected to the tube boxes (5) at both ends of the shell (1).

6. The high pressure PTA slurry heater according to claim 2, characterized in that: A heating device (10) is provided in the pipe box (5) and in the shell (1) at a position away from the pipeline (4), respectively; a temperature measuring device (101) is provided in the pipe box (5) and in the shell (1), respectively; and the temperature measuring device (101) regulates the heating device (10).

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