A reaction kettle for titanium dioxide production

Abstract

The present invention relates to the technical field of chemical reaction equipment, and specifically to a reaction kettle for titanium dioxide production, comprising a cylinder and a heat exchange tube arranged in the cylinder, the heat exchange tube comprising a primary heat exchange tube and a secondary heat exchange tube, the primary heat exchange tube is a straight tube structure with an axis extending in the up-down direction, there are multiple secondary heat exchange tubes, each of which is spirally wound around the outer periphery of the primary heat exchange tube, and multiple secondary heat exchange tubes are arranged at intervals along the axis of the primary heat exchange tube, each secondary heat exchange tube comprises a secondary spiral section spirally wound around the outside of the primary heat exchange tube, and a secondary straight tube section connected to both ends of the secondary spiral section, the two secondary straight tube sections are respectively suspended toward opposite sides of the primary heat exchange tube, and the two secondary straight tube sections of two adjacent secondary heat exchange tubes are staggered in the circumferential direction of the primary heat exchange tube. The present invention can make the overall temperature and heat exchange efficiency in the cylinder relatively uniform, and ensure the reaction effect.

Description

Technical Field

[0001] The invention relates to the technical field of chemical reaction equipment, in particular to a reaction kettle for titanium dioxide production. Background Art

[0002] The production of titanium dioxide usually uses a hydrolysis reactor, and its process flow is: using the raw material metatitanic acid and the precipitant urea [CO(NH2)2], uniformly precipitate in the hydrolysis reactor, and the slurry is washed, filtered, and calcined to obtain the finished product. Hydrolysis is an extremely important process in the industrial production of nano-TiO2, and it is a key process that determines the product quality and water washing performance. The main process of the hydrolysis reaction is: taking a certain amount of water-washed and rinsed qualified metatitanic acid and adding it to the reaction container, adding deionized water to slurry the metatitanic acid and adjusting the TiO2 concentration in the slurry to about 144g / L, adding sulfuric acid under stirring, and heating the material to boiling. As the water evaporates, the boiling point of the slurry gradually rises to a temperature of 120℃~150℃, and the metatitanic acid begins to dissolve. After the solution is clarified, it is cooled to obtain a tea-brown, clear and transparent titanium sulfate solution. Under certain conditions, a certain amount of urea and dissolved surfactant sodium dodecyl sulfate (DBS) are taken in a certain ratio, slowly added into the reactor under stirring and mixed evenly. At pH = 2-3, the effective acid content is 18-21 g / L, and the neutralization temperature is 95°C-112°C, a uniform precipitation reaction occurs to slowly generate a titanic acid suspension. After keeping warm for 20-30 minutes, it is quickly cooled to room temperature. The cooled titanic acid is sent to the washing and filtration process.

[0003] According to the above hydrolysis process, it can be seen that the reaction is accompanied by mixing, heating, cooling, etc. of the acidic solution. In order to meet the above process conditions, it is necessary to design a reactor that meets the requirements according to the process conditions. For example, the utility model patent with the authorization announcement number CN203291858U discloses a hydrolysis reactor for the production of nano titanium dioxide, which includes a cylinder, a heat exchange tube is arranged in the cylinder, and the heat exchange tube is a steam heating tube, and is spirally coiled in the cylinder from top to bottom, thereby heating the material in the cylinder. This method of using a whole heat exchange tube spirally coiled in the cylinder for heating, because the length of the heat exchange tube spiraling in the cylinder is relatively long, and the heat exchange rate of the heat exchange tube and the temperature of the heat exchange tube will change along the length of the heat exchange tube, which is easy to cause the temperature of the space above the cylinder and the temperature of the space below to be uneven, and the heating efficiency is also uneven, thereby affecting the reaction effect in the reactor. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a reactor for titanium dioxide production to solve the technical problem in the prior art that the heating efficiency and heating temperature of the heat exchange tube are uneven, thereby affecting the reaction effect in the reactor.

[0005] A titanium dioxide production reactor of the present invention adopts the following technical solution:

[0006] A reaction kettle for titanium dioxide production comprises a cylinder and a heat exchange tube arranged in the cylinder, the heat exchange tube comprising a primary heat exchange tube and a secondary heat exchange tube, the primary heat exchange tube is a straight tube structure with an axis extending in the up-down direction, the primary heat exchange tube has an inlet and an outlet, the inlet is used to introduce a heating medium, and the outlet is used to discharge the heating medium; there are multiple secondary heat exchange tubes, each of which is spirally wound on the outer circumference of the primary heat exchange tube, and the multiple secondary heat exchange tubes are arranged at intervals along the axis of the primary heat exchange tube, each secondary heat exchange tube comprises a secondary spiral section spirally wound on the outside of the primary heat exchange tube, and secondary straight tube sections connected to both ends of the secondary spiral section, the two secondary straight tube sections are respectively cantilevered toward opposite sides of the primary heat exchange tube, and the two secondary straight tube sections of two adjacent secondary heat exchange tubes are staggered in the circumferential direction of the primary heat exchange tube.

[0007] Furthermore, one end of the first-level heat exchange tube is closed and extends into the cylinder from the upper end or the lower end of the cylinder. A first partition plate extending along the first-level heat exchange tube is provided inside the first-level heat exchange tube. The first partition plate divides the interior of the first-level heat exchange tube into a first channel and a second channel both extending along the axis of the first-level heat exchange tube. The first channel and the second channel are connected at the closed end of the first-level heat exchange tube, and the ends of the first channel and the second channel outside the cylinder constitute the outlet and the inlet respectively. One of the first channel and the second channel is used to allow the heating medium to pass through, and the other is used to discharge the heating medium.

[0008] Furthermore, both ends of each secondary heat exchange tube are closed, and a second partition plate is provided in each secondary heat exchange tube, which extends along the extension direction of the entire secondary heat exchange tube. The second partition plate divides the interior of the entire secondary heat exchange tube into a third channel and a fourth channel. The third channel and the fourth channel are connected at both ends of the secondary heat exchange tube, and the third channel and the fourth channel are respectively filled with heat exchange medium.

[0009] Furthermore, at least one of the two secondary straight pipe sections of each secondary heat exchange tube is provided with an adjusting component, and the adjusting component is arranged at one end of the secondary straight pipe section close to the secondary spiral section. The adjusting component includes a memory spring and a one-way valve assembly, and the axis of the memory spring is parallel to the axis of the secondary straight pipe section. The one-way valve assembly is movably arranged in the secondary straight pipe section. The memory spring extends after the temperature in the secondary heat exchange tube reaches a set temperature, and pushes the one-way valve assembly to move in a direction away from the secondary spiral section. When the temperature of the secondary heat exchange tube drops, the memory spring contracts and pulls the one-way valve assembly back to an initial position. The one-way valve assembly is closed when the memory spring is extended and pushed, so as to cooperate with the secondary straight pipe section in a sealing and sliding manner, thereby driving the heat exchange medium in the secondary heat exchange tube to move. The one-way valve assembly opens when the memory spring is shortened and pulled, so that the heat exchange medium in the secondary heat exchange tube can pass through the one-way valve assembly.

[0010] Furthermore, the one-way valve assembly includes a connecting column, a support disk and a sealing sheet, one end of the connecting column is fixedly connected to the support disk, and the other end is connected to one end of the memory spring, the support disk is provided with a plurality of through holes at intervals, and the sealing sheet is arranged on the side of the support disk away from the memory spring, when the memory spring extends and pushes the support disk to move, the sealing sheet is tightly attached to the support disk and blocks the through hole on the support disk, so that the one-way valve assembly is closed and a piston structure is formed, and when the memory spring contracts and pulls the support disk, the sealing sheet opens the through hole on the support disk, so that the heat exchange medium in the secondary heat exchange tube can pass through the support disk.

[0011] Furthermore, the connecting column is a conical structure, the large diameter end of the conical structure is fixedly connected to the support disk, and the tip extends into the memory spring.

[0012] Furthermore, a plurality of tertiary heat exchange tubes are respectively wound on the two secondary straight tube sections of the secondary heat exchange tube, and each tertiary heat exchange tube includes a tertiary spiral section spirally wound on the secondary straight tube section, and two tertiary straight tube sections connected at both ends of the tertiary spiral section, and the tertiary straight tube sections of two adjacent tertiary heat exchange tubes are staggered in the circumferential direction of the secondary straight tube section.

[0013] Furthermore, both ends of each tertiary heat exchange tube are closed, and a third partition plate is provided in each tertiary heat exchange tube, and the third partition plate extends along the extension direction of the entire tertiary heat exchange tube, and the third partition plate divides the interior of the entire tertiary heat exchange tube into a fifth channel and a sixth channel, and the fifth channel and the sixth channel are connected at both ends of the tertiary heat exchange tube, and the fifth channel and the sixth channel are respectively filled with heat exchange medium.

[0014] Furthermore, each of the three-stage heat exchange tubes is provided with the regulating component.

[0015] Furthermore, a plurality of fourth-stage heat exchange tubes are respectively wound around the third-stage straight tube section of each third-stage heat exchange tube.

[0016] The beneficial effects of the present invention are as follows: a reactor for titanium dioxide production of the present invention arranges the heat exchange tubes located in the cylinder into a multi-stage structure independent of each other, the media in the primary heat exchange tube and the secondary heat exchange tube do not circulate with each other, and only heat exchange is performed, the primary heat exchange tube and each secondary heat exchange tube are a tube body with a relatively short length, the primary heat exchange tube and each secondary heat exchange tube serve as multiple independent heat exchange units, the temperature difference in each heat exchange unit is relatively small, the heat exchange efficiency and temperature of each part of each heat exchange unit are basically the same, the heat exchange efficiency in the entire cylinder is balanced and uniformed by multiple secondary heat exchange tubes, for the entire cylinder, the overall temperature and heat exchange efficiency can be made relatively uniform, the temperature of each area in the cylinder can be adjusted, the response speed can be accelerated, and the reaction effect can be guaranteed.

[0017] By setting regulating components in the secondary heat exchange tubes and the tertiary heat exchange tubes, the circulation flow of the heat exchange medium in the corresponding heat exchange tubes can be adjusted according to the temperature of each area, and the flow rate of the heat transfer fluid in the upper and lower branches can be automatically adjusted to reasonably distribute the input temperature to the areas, thereby reducing the temperature difference between different areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a three-dimensional schematic diagram of an embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of an embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a heat exchange tube in one embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the primary heat exchange tube and the secondary heat exchange tube in one embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0023] Figure 5This is a schematic diagram of the structure of the secondary heat exchange tube and the tertiary heat exchange tube in one embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the third-stage heat exchange tube and the fourth-stage heat exchange tube in one embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0025] Figure 7 This is a schematic diagram of a secondary heat exchange tube in an embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0026] Figure 8 It is a partial cross-sectional view of a secondary heat exchange tube in an embodiment of a reaction kettle for titanium dioxide production of the present invention;

[0027] Fig. 9 for Figure 8 Enlarged view of part A in the figure.

[0028] In the figure: 100, cylinder; 101, cover; 102, detection component; 103, first interface; 104, second interface; 105, third interface; 106, fourth interface; 200, heat exchange tube; 201, first partition plate; 202, first channel; 203, second channel; 210, primary heat exchange tube; 220, secondary heat exchange tube; 221, secondary spiral section; 222, secondary straight tube section; 223, second partition plate; 224, support plate; 225, sealing sheet; 226, connecting column; 227, memory spring; 230, tertiary heat exchange tube; 240, quaternary heat exchange tube. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] An embodiment of a titanium dioxide production reactor of the present invention is as follows Figures 1 to 9As shown, the titanium dioxide production reactor includes a cylinder 100 and a heat exchange tube 200 arranged in the cylinder 100, the upper end of the cylinder 100 is connected to a cover 101, the side wall of the cylinder 100 is provided with a first interface 103 and a second interface 104, the cover 101 is provided with a third interface 105 and a fourth interface 106, the first interface 103, the second interface 104, the third interface 105 and the fourth interface 106 are respectively used for introducing and releasing reaction materials, and the cover 101 is also provided with a detection component 102 for detecting parameters in the cylinder 100. The cylinder 100, the cover 101 and the detection component 102 are all related to the prior art and will not be described in detail here.

[0031] In the present invention, the heat exchange tube 200 includes a primary heat exchange tube 210, a secondary heat exchange tube 220, a tertiary heat exchange tube 230 and a quaternary heat exchange tube 240. In other embodiments, only the primary heat exchange tube 210 and the secondary heat exchange tube 220 may be provided, or only the primary heat exchange tube 210, the secondary heat exchange tube 220 and the tertiary heat exchange tube 230 may be provided. Of course, more levels of heat exchange tubes may also be provided, such as additionally providing a fifth-level heat exchange tube on the fourth-level heat exchange tube 240. The primary heat exchange tube 210 is a straight tube structure with an axis extending in the up-down direction. The primary heat exchange tube 210 has an inlet and an outlet. The inlet is used to pass the heating medium, and the outlet is used to discharge the heating medium. There are multiple secondary heat exchange tubes 220. In this embodiment, there are four secondary heat exchange tubes 220. In other embodiments, the number of secondary heat exchange tubes 220 may be set according to actual conditions. Each secondary heat exchange tube 220 is spirally wound around the outer circumference of the primary heat exchange tube 210, and multiple secondary heat exchange tubes 220 are arranged at intervals along the axis of the primary heat exchange tube 210. Each secondary heat exchange tube 220 includes a secondary spiral section 221 spirally wound around the outside of the primary heat exchange tube 210, and secondary straight tube sections 222 connected to both ends of the secondary spiral section 221. The two secondary straight tube sections 222 are respectively cantilevered toward opposite sides of the primary heat exchange tube 210, and the two secondary straight tube sections 222 of two adjacent secondary heat exchange tubes 220 are staggered in the circumferential direction of the primary heat exchange tube 210.

[0032] In this embodiment, one end of the primary heat exchange tube 210 is closed and extends from the upper end or the lower end of the cylinder 100 into the cylinder 100. In this embodiment, the upper end of the primary heat exchange tube 210 extends upward from the lower end of the cylinder 100 into the cylinder 100. A first partition plate 201 extending along the primary heat exchange tube 210 is provided inside the primary heat exchange tube 210. The first partition plate 201 divides the interior of the primary heat exchange tube 210 into a first channel 202 and a second channel 203 both extending along the axis of the primary heat exchange tube 210. The first channel 202 and the second channel 203 are connected at the closed end of the primary heat exchange tube 210. The ends of the first channel 202 and the second channel 203 outside the cylinder 100 constitute the outlet and the inlet, respectively. One of the first channel 202 and the second channel 203 is used to pass the heating medium, and the other is used to discharge the heating medium.

[0033] In the present embodiment, both ends of each secondary heat exchange tube 220 are closed, and a second partition plate 223 is provided in each secondary heat exchange tube 220. The second partition plate 223 extends along the extension direction of the entire secondary heat exchange tube 220. The second partition plate 223 divides the interior of the entire secondary heat exchange tube 220 into a third channel and a fourth channel. The third channel and the fourth channel are connected at both ends of the secondary heat exchange tube 220, and the third channel and the fourth channel are respectively filled with heat exchange medium.

[0034] In this embodiment, at least one of the two secondary straight pipe sections 222 of each secondary heat exchange tube 220 is provided with an adjusting component, and the adjusting component is arranged at one end of the secondary straight pipe section 222 close to the secondary spiral section 221. The adjusting component includes a memory spring 227 and a one-way valve assembly, and the axis of the memory spring 227 is parallel to the axis of the secondary straight pipe section 222. The one-way valve assembly is movably arranged in the secondary straight pipe section 222. The one-way valve assembly is connected to one end of the memory spring 227, and the other end of the memory spring 227 is fixedly connected to the inner wall of the secondary straight pipe section 222. The memory spring 227 extends after the temperature in the secondary heat exchange tube 220 reaches the set temperature, and pushes the one-way valve assembly to move in the direction away from the secondary spiral section 221. When the temperature of the secondary heat exchange tube 220 drops, the memory spring 227 contracts and pulls the one-way valve assembly back to the initial position. The one-way valve assembly is closed when the memory spring 227 extends and is pushed, so as to seal and slide with the secondary straight tube section 222, thereby driving the heat exchange medium in the secondary heat exchange tube 220 to move. The one-way valve assembly opens when the memory spring 227 shortens and is pulled, so that the heat exchange medium in the secondary heat exchange tube 220 can pass through the one-way valve assembly.

[0035] In this embodiment, the one-way valve assembly includes a connecting column 226, a support disk 224 and a sealing sheet 225, one end of the connecting column 226 is fixedly connected to the support disk 224, and the other end is connected to one end of the memory spring 227, a plurality of through holes are arranged on the support disk 224, and the sealing sheet 225 is arranged on the side of the support disk 224 away from the memory spring 227, when the memory spring 227 is extended and pushes the support disk 224 to move, the sealing sheet 225 is close to the support disk 224 and blocks the through hole on the support disk 224, so that the one-way valve assembly is closed and a piston structure is formed, when the memory spring 227 is contracted and pulls the support disk 224, the sealing sheet 225 opens the through hole on the support disk 224, so that the heat exchange medium in the secondary heat exchange tube 220 can pass through the support disk 224. The connecting column 226 is a conical structure, the large diameter end of the conical structure is fixedly connected to the support disk 224, and the tip extends into the memory spring 227.

[0036] In the present embodiment, a plurality of the tertiary heat exchange tubes 230 are respectively wound around the two secondary straight tube sections 222 of the secondary heat exchange tube 220. The shape and structure of each tertiary heat exchange tube 230 are the same as those of the secondary heat exchange tube 220 except for the size. Each tertiary heat exchange tube 230 includes a tertiary spiral section spirally wound around the secondary straight tube section 222, and two tertiary straight tube sections connected at both ends of the tertiary spiral section. The tertiary straight tube sections of two adjacent tertiary heat exchange tubes 230 are staggered in the circumferential direction of the secondary straight tube section 222. In addition, both ends of each tertiary heat exchange tube 230 are closed, and a third partition plate is provided in each tertiary heat exchange tube 230, and the third partition plate extends along the extension direction of the entire tertiary heat exchange tube 230. The third partition plate divides the interior of the entire tertiary heat exchange tube 230 into a fifth channel and a sixth channel, and the fifth channel and the sixth channel are connected at both ends of the tertiary heat exchange tube 230, and the fifth channel and the sixth channel are respectively filled with heat exchange medium. The regulating assembly is provided in each tertiary heat exchange tube 230, and the shape and structure of the regulating assembly in the tertiary heat exchange tube 230 and the secondary heat exchange tube 220 are the same except for the size.

[0037] In this embodiment, a plurality of the fourth-stage heat exchange tubes 240 are respectively wound around the third-stage straight tube section of each third-stage heat exchange tube 230. In this embodiment, the fourth-stage heat exchange tube 240, the third-stage heat exchange tube 230 and the second-stage heat exchange tube 220 are the same in shape and structure except for the different sizes.

[0038] The reactor for titanium dioxide production of the present invention arranges the heat exchange tubes 200 located in the cylinder 100 into a multi-stage structure independent of each other. The media in the primary heat exchange tube 210 and the secondary heat exchange tube 220 do not circulate with each other, and only heat exchange is performed. For the primary heat exchange tube 210 and each secondary heat exchange tube 220, each is a tube body with a relatively short length. The primary heat exchange tube 210 and each secondary heat exchange tube 220 serve as multiple independent heat exchange units. The temperature difference in each heat exchange unit is relatively small. The heat exchange efficiency and temperature of each part of each heat exchange unit are basically the same. The heat exchange efficiency in the entire cylinder 100 is balanced and uniformed by multiple secondary heat exchange tubes 220. For the entire cylinder 100, the overall temperature and heat exchange efficiency can be made relatively uniform, the temperature of each area in the cylinder 100 can be adjusted, the response speed can be accelerated, and the reaction effect can be guaranteed. In addition, by setting an adjustment component in the secondary heat exchange tube 220 and the tertiary heat exchange tube 230, the circulation flow of the heat exchange medium in the corresponding stage heat exchange tube can be adjusted according to the temperature of each area, and the flow rate of the heat transfer fluid in the upper and lower branches can be automatically adjusted to reasonably distribute the input temperature to the said area, thereby reducing the temperature difference between different areas.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaction kettle for titanium dioxide production, comprising a cylinder (100) and a heat exchange tube (200) arranged in the cylinder (100), characterized in that: The heat exchange tube (200) comprises a primary heat exchange tube (210) and a secondary heat exchange tube (220); the primary heat exchange tube (210) is a straight tube structure with an axis extending in the up-down direction; the primary heat exchange tube (210) has an inlet and an outlet; the inlet is used to introduce a heating medium, and the outlet is used to discharge the heating medium; there are a plurality of secondary heat exchange tubes (220); each secondary heat exchange tube (220) is spirally wound around the outer periphery of the primary heat exchange tube (210); and the plurality of secondary heat exchange tubes (220) are arranged at intervals along the axis of the primary heat exchange tube (210); each secondary heat exchange tube (220) is arranged at intervals along the axis of the primary heat exchange tube (210); The first heat exchange tube (210) comprises a secondary spiral section (221) spirally wound around the outside of the first heat exchange tube (210), and secondary straight tube sections (222) connected to both ends of the secondary spiral section (221), the two secondary straight tube sections (222) respectively cantilevering toward opposite sides of the first heat exchange tube (210), and the two secondary straight tube sections (222) of two adjacent secondary heat exchange tubes (220) are staggered in the circumferential direction of the first heat exchange tube (210); one end of the first heat exchange tube (210) is closed and extends from the upper end or the lower end of the cylinder (100) into the cylinder (100), and the first heat exchange tube (210) is closed. A first partition plate (201) extending along the first heat exchange tube (210) is provided inside the cylinder (100), the first partition plate (201) partitioning the interior of the first heat exchange tube (210) into a first channel (202) and a second channel (203) both extending along the axis of the first heat exchange tube (210), the first channel (202) and the second channel (203) being connected at one end of the first heat exchange tube (210) that is closed, the ends of the first channel (202) and the second channel (203) outside the cylinder (100) forming the outlet and the inlet, respectively, and the first channel (202) and the second channel (203) are connected to each other at one end of the first heat exchange tube (210) that is closed, and the ends of the first channel (202) and the second channel (203) outside the cylinder (100) forming the outlet and the inlet, respectively. One of the channels (203) is used for introducing a heating medium, and the other is used for discharging the heating medium; both ends of each secondary heat exchange tube (220) are closed, and each secondary heat exchange tube (220) is provided with a second partition plate (223), the second partition plate (223) extends along the extension direction of the entire secondary heat exchange tube (220), and the second partition plate (223) divides the interior of the entire secondary heat exchange tube (220) into a third channel and a fourth channel, the third channel and the fourth channel are connected at both ends of the secondary heat exchange tube (220), and the third channel and the fourth channel are respectively filled with heat exchange medium;At least one of the two secondary straight pipe sections (222) of each secondary heat exchange tube (220) is provided with an adjustment component, the adjustment component being arranged at one end of the secondary straight pipe section (222) close to the secondary spiral section (221), the adjustment component comprising a memory spring (227) and a one-way valve component, the axis of the memory spring (227) being parallel to the axis of the secondary straight pipe section (222), the one-way valve component being movably arranged in the secondary straight pipe section (222), the memory spring (227) extending after the temperature in the secondary heat exchange tube (220) reaches a set temperature, and pushing the one-way valve component to move the memory spring (227) toward the secondary spiral section (221). The one-way valve assembly moves in a direction away from the secondary spiral section (221), and when the temperature of the secondary heat exchange tube (220) drops, the memory spring (227) contracts and pulls the one-way valve assembly back to the initial position. The one-way valve assembly closes when the memory spring (227) is extended and pushed, so as to seal and slide with the secondary straight tube section (222), thereby driving the heat exchange medium in the secondary heat exchange tube (220) to move. The one-way valve assembly opens when the memory spring (227) is shortened and pulled, so that the heat exchange medium in the secondary heat exchange tube (220) can pass through the one-way valve assembly. ; 2. The titanium dioxide production reactor according to claim 1, characterized in that: The one-way valve assembly comprises a connecting column (226), a supporting disk (224) and a sealing sheet (225); one end of the connecting column (226) is fixedly connected to the supporting disk (224), and the other end is connected to one end of the memory spring (227); a plurality of through holes are provided on the supporting disk (224) at intervals; the sealing sheet (225) is provided on a side of the supporting disk (224) away from the memory spring (227); when the memory spring (227) extends and pushes the supporting disk (224) to move, the sealing sheet (225) is closely attached to the supporting disk (224) and blocks the through hole on the supporting disk (224), so that the one-way valve assembly is closed and a piston structure is formed; when the memory spring (227) contracts and pulls the supporting disk (224), the sealing sheet (225) opens the through hole on the supporting disk (224), so that the heat exchange medium in the secondary heat exchange tube (220) can pass through the supporting disk (224).

3. The titanium dioxide production reactor according to claim 2, characterized in that: The connecting column (226) is a conical structure, the large diameter end of the conical structure is fixedly connected to the support plate (224), and the tip extends into the memory spring (227).

4. The titanium dioxide production reactor according to claim 2, characterized in that: A plurality of tertiary heat exchange tubes (230) are respectively wound around the two secondary straight tube sections (222) of the secondary heat exchange tube (220); each tertiary heat exchange tube (230) comprises a tertiary spiral section spirally wound around the secondary straight tube section (222), and two tertiary straight tube sections connected at both ends of the tertiary spiral section; the tertiary straight tube sections of two adjacent tertiary heat exchange tubes (230) are staggered in the circumferential direction of the secondary straight tube section (222).

5. The titanium dioxide production reactor according to claim 4, characterized in that: Both ends of each tertiary heat exchange tube (230) are closed, and a third partition plate is provided inside each tertiary heat exchange tube (230), the third partition plate extending along the extension direction of the entire tertiary heat exchange tube (230), and the third partition plate divides the interior of the entire tertiary heat exchange tube (230) into a fifth channel and a sixth channel, the fifth channel and the sixth channel are connected at both ends of the tertiary heat exchange tube (230), and the fifth channel and the sixth channel are respectively filled with heat exchange medium.

6. The titanium dioxide production reactor according to claim 5, characterized in that: The regulating component is provided in each tertiary heat exchange tube (230).

7. The titanium dioxide production reactor according to claim 6, characterized in that: A plurality of fourth-stage heat exchange tubes (240) are respectively wound around the third-stage straight tube section of each third-stage heat exchange tube (230).

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