A reboiler and a carbon disulfide rectification column comprising the same

Abstract

This invention relates to the field of carbon disulfide preparation technology, specifically to a reboiler and a carbon disulfide distillation column containing the reboiler, comprising a self-driven anti-scaling component assembly. The self-driven anti-scaling component assembly includes a rotating cleaning component assembly and a self-opening and closing anti-clogging and descaling mechanism. The rotating cleaning component assembly is installed at the top of the main pipe fitting and is used to agitate and clean the inner wall of the main pipe fitting in solution using steam within the main pipe fitting. This invention utilizes a steam-driven cleaning and turbulence impeller to clean the pipe wall online, inhibiting scaling; a self-opening and closing valve cover adaptively adjusts the opening to prevent clogging and scouring; rotating micro-vibration collaboratively breaks down initial adhesion and enhances cleaning; shutdown impact removes outlet crystals; and outlet turbulence improves steam distribution and reduces mist entrainment. This achieves efficient self-cleaning and improves operational stability.

Description

Technical Field

[0001] This invention relates to the field of carbon disulfide preparation technology, specifically to a reboiler and a carbon disulfide distillation column containing the reboiler. Background Technology

[0002] Carbon disulfide is an important chemical raw material widely used in viscose fiber, pesticides, and rubber vulcanization. Industrially, carbon disulfide is often produced by reacting natural gas with sulfur. The reaction product is a gas-liquid mixture containing sulfur, hydrogen sulfide, carbon disulfide, and unreacted methane. Because the product contains a large number of impurities, it must be purified through distillation to obtain high-purity carbon disulfide.

[0003] In distillation, the reboiler is a crucial heat exchange device, its function being to heat the liquid in the bottom of the column, causing partial vaporization and providing rising steam for the distillation column. However, in the carbon disulfide distillation process, the reboiler has long faced the following technical problems: First, the medium contains dissolved sulfur. During the heating process, as carbon disulfide evaporates, the concentration of sulfur in the liquid phase gradually increases. After reaching a supersaturated state, sulfur precipitates and adheres to the inner wall of the heat exchange tubes. The sulfur scale layer has a low thermal conductivity, leading to a decrease in heat transfer efficiency, an increase in energy consumption, and in severe cases, even blockage of the heat exchange tubes, forcing the unit to be shut down for cleaning.

[0004] Secondly, the presence of hydrogen sulfide exacerbates the corrosion risk of equipment, especially under the scale layer, where localized corrosion is prone to occur, affecting the service life of the equipment.

[0005] Third, existing reboilers lack effective online self-cleaning methods. Traditional cleaning methods require mechanical or chemical cleaning after shutdown, which not only affects production efficiency but also increases operation and maintenance costs. Some designs employ fixed-structure anti-scaling measures, but their effectiveness is limited and they are difficult to adapt to the anti-scaling requirements under fluctuating load conditions.

[0006] Fourth, impurities are prone to deposit at the steam outlet. During low-load operation or start-up, the steam flow rate is low, and trace amounts of sulfur entrained in the steam can easily adhere and crystallize at the pipe opening. Long-term accumulation can lead to blockage of the outlet, affecting steam flow and the stability of distillation operations.

[0007] To address the aforementioned issues, it is necessary to develop a reboiler that can self-clean during operation, has a significant anti-scaling effect, and is simple and reliable in structure, in order to meet the long-term stable operation requirements of the carbon disulfide distillation process. Summary of the Invention

[0008] In order to overcome the above-mentioned technical problems, the present invention aims to provide a reboiler and a carbon disulfide distillation column containing the reboiler, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: A reboiler includes a main component assembly comprising multiple main pipe components, characterized in that it further includes a self-driven anti-scaling component assembly, comprising a rotary cleaning component assembly and a self-opening and closing anti-clogging and descaling mechanism; the rotary cleaning component assembly is installed at the top of the main pipe component and is used to agitate and clean the inner wall of the main pipe component in the solution-filled portion by means of the rising gas phase or gas-liquid mixture generated by the evaporation of the solution within the main pipe component; the rotary cleaning component assembly includes a connecting seat connected to the top of the main pipe component, the connecting seat being... A main shaft support frame is connected to the top of the connector, and a rotating main shaft is rotatably connected to the main shaft support frame. Multiple scale-removing and turbulence-inducing impellers are connected to the bottom of the rotating main shaft, positioned where the main component is in the solution. A drive impeller is connected to the rotating main shaft and is located within the connector cavity. The self-opening and closing anti-clogging descaling mechanism includes a friction-fitting shaft connected to the rotating main shaft. A self-opening and closing rotary valve cover is fitted over the friction-fitting shaft, and the self-opening and closing rotary valve cover is in frictional contact with the friction-fitting shaft. The self-opening and closing rotary valve cover is positioned at the top air outlet of the connector.

[0010] Preferably, the drive impeller is driven to rotate by the rising steam generated by the evaporation of the solution inside the main pipe, and drives the scale removal turbulence paddle to rotate through the rotating main shaft.

[0011] Preferably, the scale-removing and turbulence-disrupting paddle has a spiral structure, with its outer edge fitting with the inner wall of the main pipe through a gap, for disturbing the solution and scraping the inner wall of the main pipe during rotation.

[0012] Preferably, the bottom of the self-opening and closing rotary valve cover is provided with conical sealing impact heads distributed in a ring, and the conical sealing impact heads form a conical surface fit with the inner wall of the air outlet at the top of the connecting seat.

[0013] Preferably, the outer edge of the self-opening and closing rotary valve cover is provided with annularly distributed guide grooves to guide the airflow to generate a tangential force, thereby driving the self-opening and closing rotary valve cover to rotate.

[0014] Preferably, the outer extension of the self-opening and closing rotary valve cover is further provided with annularly distributed outlet turbulence elements for turbulenting of the discharged gas phase or gas-liquid mixture.

[0015] Preferably, the self-opening and closing rotary valve cover is provided with a wear-resistant friction sleeve, and the wear-resistant friction sleeve and the friction mating shaft are in frictional contact with a gap.

[0016] Preferably, the clearance fit between the wear-resistant friction sleeve and the friction mating shaft causes the self-opening and closing rotary valve cover to produce irregular tilting and swaying during rotation, thereby triggering micro-vibration.

[0017] Preferably, the micro-vibration is transmitted to the rotating main shaft and the descaling turbulence impeller through the friction-fitted shaft, and acts on the main pipe component.

[0018] Preferably, the self-opening rotary valve cover rises and opens after overcoming its own weight and frictional resistance with the help of steam pressure, and its opening range is positively correlated with the steam pressure, thus achieving adaptive adjustment.

[0019] Preferably, the self-opening rotary valve cover falls under gravity when the steam volume decreases. When it falls, the conical sealing impact head makes impact contact with the inner wall of the air outlet at the top of the connecting seat, which is used to remove impurities attached to the air outlet.

[0020] A carbon disulfide distillation column, comprising the aforementioned reboiler.

[0021] Compared with the prior art, the beneficial effects of the present invention are: A rotating descaling component assembly is installed inside the main pipe. The impeller is driven to rotate by the flow of steam, which in turn drives the descaling turbulence paddle to rotate continuously in the solution. The descaling turbulence paddle disturbs the solution, breaks up the concentration boundary layer near the pipe wall, and reduces the supersaturation of sulfur on the wall surface, thus inhibiting the formation of scale from the source. On the other hand, the contact or proximity between the paddle blades and the pipe wall can mechanically scrape the thin scale that has already adhered, achieving continuous online self-cleaning. This design does not require an external power source, has a simple structure, and low energy consumption. During low load or start-up, the valve cover closes by gravity to prevent low-speed gas or gas-liquid mixtures from directly passing through the outlet, thus avoiding the deposition of sulfur entrained in the steam at the outlet. When the steam volume increases and the pressure rises, the valve cover automatically opens, allowing the gas or gas-liquid mixture to pass through the annular gap at a higher flow rate, which flushes the outlet and further removes any impurities that may be attached. The valve cover opening is automatically adjusted according to the steam pressure, with a larger opening when the steam volume is high and a smaller opening when the steam volume is low, maintaining a certain outlet flow rate while ensuring the flow capacity, thus taking into account both anti-clogging and steam exhaust requirements. The self-opening rotary valve cover rotates under steam drive. Simultaneously, due to the clearance fit between the wear-resistant friction sleeve and the friction-fitting shaft, the valve cover exhibits irregular tilting and swaying during rotation, triggering periodic micro-vibrations. These vibrations are transmitted through the friction-fitting shaft to the rotating main shaft and the descaling turbulence impeller, ultimately acting on the entire main pipe fitting. This results in the following synergistic effects: disrupting the initial adhesion of the solution to the pipe wall surface, reducing the bonding force between impurities and the wall; enhancing the turbulence and scraping effect of the descaling turbulence impeller, improving cleaning efficiency; and promoting the discharge of detached impurities, preventing secondary deposition. This micro-vibration effect originates from the energy of steam flow, requiring no additional power input, and the vibration frequency is adaptively adjusted to the steam load, exhibiting good adaptability to operating conditions. When the reboiler is shut down or the steam volume decreases suddenly, the self-opening rotary valve cover falls back under the action of gravity. The conical sealing impact head at the bottom impacts the inner wall of the gas outlet of the connecting seat. The conical structure design generates radial force during the impact process, which effectively squeezes and removes sulfur crystals that may be attached to the gas outlet, realizing automatic cleaning in the shutdown state and avoiding impurities from solidifying and clogging during shutdown. The self-closing rotary valve cover is equipped with an outlet turbulence element to turbulent the discharged gas phase or gas-liquid mixture, improve the initial distribution state of steam entering the distillation column, reduce mist entrainment, improve gas-liquid mass transfer efficiency, and indirectly enhance the distillation separation effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main component assembly of the present invention; Figure 2 This is a cross-sectional structural diagram of the main component group of the present invention; Figure 3 This is a schematic diagram of the structure of the self-driven anti-scaling component assembly of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the self-driven anti-scaling component assembly of the present invention; Figure 5 This is a schematic diagram of the self-opening and closing anti-clogging descaling mechanism and the rotating descaling component assembly of the present invention. Figure 6 This is a schematic diagram of the self-opening and closing anti-clogging and descaling mechanism of the present invention.

[0023] In the diagram: 01, Main component assembly; 11, Main main component; 02, Self-driven anti-scaling component assembly; 21, Rotary cleaning component assembly; 211, Connecting seat; 212, Main shaft support frame; 213, Rotary main shaft; 214, Cleaning turbulence impeller; 215, Drive impeller; 22, Self-opening and closing anti-clogging and descaling mechanism; 221, Friction mating shaft; 222, Self-opening and closing rotary valve cover; 2221, Wear-resistant friction sleeve; 2222, Conical sealing impact head; 2223, Guide channel; 2224, Outlet turbulence component. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] One embodiment provided by the present invention: refer to Figures 1-2A reboiler includes a main component assembly 01, wherein the main component assembly 01 is provided with multiple main pipe components 11, and further includes: refer to Figures 2-6 The self-driven anti-scaling component group 02 includes a rotating scale removal component group 21 and a self-opening and closing anti-clogging and descaling mechanism 22.

[0026] The rotating cleaning component assembly 21 is installed at the top of the main pipe component 11. The rotating cleaning component assembly 21 is used to agitate and clean the inner wall of the main pipe component 11 in the solution by means of steam in the main pipe component 11. The rotating cleaning component assembly 21 includes a connecting seat 211, which is threaded to the top of the main pipe component 11. A main shaft support frame 212 is connected to the top of the connecting seat 211.

[0027] The main spindle support frame 212 consists of a top ring and a bottom ring. The bottom ring is connected to the connecting seat 211. The top ring and the bottom ring are connected through the frame body. The main spindle support frame 212 is rotatably connected to a rotating main spindle 213. The rotating main spindle 213 is rotatably connected to the top ring of the main spindle support frame 212.

[0028] The bottom end of the rotating main shaft 213 is connected to a plurality of cleaning and turbulence-inducing paddles 214, which are located in the main pipe fitting 11 when it is in the solution. The rotating main shaft 213 is connected to a drive impeller 215, which is located in the cavity of the connecting seat 211. When the main pipe fitting 11 is in operation, the gas phase or gas-liquid mixture generated by the evaporation of the solution will pass through the drive impeller 215, and the flowing medium will drive the drive impeller 215 to rotate. The rotation of the drive impeller 215 drives the cleaning and turbulence-inducing paddles 214 at the bottom end of the rotating main shaft 213 to stir in the solution and clean the inner wall of the main pipe fitting 11, removing impurities from the inner wall.

[0029] The self-opening and closing anti-clogging and descaling mechanism 22 includes a friction-fitting shaft 221, which is connected to the rotating main shaft 213. The friction-fitting shaft 221 is fitted with a self-opening and closing rotary valve cover 222, and there is frictional contact between the self-opening and closing rotary valve cover 222 and the friction-fitting shaft 221.

[0030] The self-opening and closing rotary valve cover 222 covers the top air outlet of the connecting seat 211. A wear-resistant friction sleeve 2221 is provided inside the self-opening and closing rotary valve cover 222. The wear-resistant friction sleeve 2221 and the friction mating shaft 221 are in frictional contact. Both the wear-resistant friction sleeve 2221 and the friction mating shaft 221 are made of wear-resistant material and have a low coefficient of friction. The bottom of the self-opening and closing rotary valve cover 222 is provided with annularly distributed conical sealing impact heads 2222. The conical sealing impact heads 2222 fit against the inner wall of the top air outlet of the connecting seat 211. The conical sealing impact heads 2222 and the top air outlet of the connecting seat 211 are designed to be conical. The outer extension of the self-opening and closing rotary valve cover 222 is provided with annularly distributed guide grooves 2223. The outer extension of the self-opening and closing rotary valve cover 222 is also provided with annularly distributed outlet baffles 2224. When a gaseous or gas-liquid mixture passes through the connecting seat 211 in the main pipe component 11 and tries to exit from the top outlet of the connecting seat 211, it is blocked by the self-opening and closing rotary valve cover 222 and cannot be discharged. Only when the amount of steam increases and the pressure increases will the self-opening and closing rotary valve cover 222 be opened and made to rise. When the gas passes through the self-opening and closing rotary valve cover 222, the guide groove 2223 will cause the self-opening and closing rotary valve cover 222 to rotate while rising. In addition, the frictional contact between the wear-resistant friction sleeve 2221 and the friction mating shaft 221 is a gapped frictional contact. The self-opening and closing rotary valve cover 222 will rotate and generate an irregular tilt angle, frequently contacting the friction mating shaft 221. The vibration generated by the frequent contact will vibrate the entire rotating cleaning component assembly 21 and the main pipe component 11, which helps to remove the initially attached impurities.

[0031] The outlet turbulence element 2224 can turbulentize the discharged gas phase or gas-liquid mixture.

[0032] Working principle: In practical use, the bottom part of the main pipe component 11 is located in the bottom chamber of the main component assembly 01, and the bottom solution in the distillation column flows into the main pipe component 11 through the pipeline. When a heating medium is introduced into the main component assembly 01 to heat the main pipe component 11, the solution inside the main pipe component 11 evaporates due to the heat, and the resulting gas phase or gas-liquid mixture flows upward.

[0033] During the initial startup phase or low-load operation of the reboiler, the amount of steam generated in the main pipe 11 is relatively small, and the flow rate is slow. At this time, the self-closing rotary valve cover 222 closes to the outlet at the top of the connecting seat 211 by gravity, preventing the direct discharge of low-speed steam. This design aims to prevent impurities such as sulfur carried in the low-speed flowing gas phase or gas-liquid mixture from depositing at the outlet, thereby reducing the risk of scaling at the opening.

[0034] As heating efficiency increases, steam production increases. When the steam pressure is sufficient to overcome the weight and frictional resistance of the self-opening rotary valve cover 222, the cover is lifted, and the outlet opens. Gas or a gas-liquid mixture is discharged from the annular gap between the cover and the connecting seat 211. At this time, due to the reduced flow cross-section, the steam velocity significantly increases, which helps to flush away impurities remaining at the opening and further prevents blockage.

[0035] During normal operation, the flow rate of the gas phase or gas-liquid mixture fluctuates with changes in load. When the steam pressure is low, the opening range of the self-opening and closing rotary valve cover 222 is small, and the gas flow rate is high, yet the self-cleaning effect is still maintained. When the steam pressure is high, the valve cover opening range increases, ensuring smooth steam discharge and avoiding throttling resistance. Overall, the self-opening and closing rotary valve cover 222 achieves the function of adaptively adjusting the opening degree according to the steam volume, balancing anti-clogging and flow capacity.

[0036] The self-opening and closing rotary valve cover 222 has a wear-resistant friction sleeve 2221 inside, which forms a frictional contact with the friction mating shaft 221 with a gap. Simultaneously, the valve cover has annularly distributed guide grooves 2223 extending outwards. When steam passes through, the guide grooves 2223 guide the airflow to generate a tangential force, driving the self-opening and closing rotary valve cover 222 to rotate. Due to the gap between the friction mating shaft 221 and the wear-resistant friction sleeve 2221, the valve cover will produce irregular tilting and swaying during rotation, thus triggering periodic micro-vibrations.

[0037] The vibration is transmitted through the friction-fitting shaft 221 to the rotating main shaft 213 and the descaling turbulence impeller 214, and then acts on the entire main pipe component 11. The vibration has the following technical effects: Disrupts the solution boundary layer, reducing the initial adhesion of impurities such as sulfur to the pipe wall; Enhance the turbulence and cleaning effect of the cleaning turbulence paddle 214; It promotes the removal of tiny impurities adhering to the inner wall of the main component 11, thereby enhancing its self-cleaning ability.

[0038] Furthermore, the bottom of the self-opening and closing rotary valve cover 222 is provided with annularly distributed conical sealing impact heads 2222, which form a conical surface fit with the inner wall of the outlet nozzle at the top of the connecting seat 211. When the reboiler stops or the steam volume decreases suddenly, the self-opening and closing rotary valve cover 222 falls back under the action of gravity, and the conical sealing impact heads 2222 make impact contact with the inner wall of the outlet nozzle. Utilizing the guiding and squeezing action of the conical structure, impurities that may be attached to the outlet are effectively removed, achieving automatic cleaning in the shutdown state.

[0039] The outlet turbulence element 2224 is located on the outer extension of the self-opening and closing rotary valve cover 222. When steam is discharged, it turbulents the airflow, improves the uniformity of steam distribution in the tower, reduces mist entrainment, and improves distillation efficiency.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A reboiler comprising a main body component group in which a plurality of main pipe members are provided, characterized by, Also includes: The self-driven anti-scaling component assembly includes a rotary descaling component assembly and a self-opening and closing anti-clogging descaling mechanism. The rotating descaling component assembly is installed at the top of the main pipe component and is used to agitate and clean the inner wall of the main pipe component in the solution using the steam inside the main pipe component. The rotating descaling component assembly includes a connecting seat, which is connected to the top of the main component. A main shaft support frame is connected to the top of the connecting seat, and a rotating main shaft is rotatably connected to the main shaft support frame. The bottom end of the rotating spindle is connected to a plurality of scale-removing and turbulence-inducing blades, which are located in the main pipe when it is in the solution. A drive impeller is connected to the rotating spindle and is located in the connecting seat cavity. The self-opening and closing anti-clogging and descaling mechanism includes a friction-fitting shaft connected to a rotating main shaft. The friction-fitting shaft is fitted with a self-opening and closing rotary valve cover. The self-opening and closing rotary valve cover and the friction-fitting shaft are in frictional contact. The self-opening and closing rotary valve cover is located at the top air outlet of the connecting seat.

2. A reboiler according to claim 1, characterized in that: The drive impeller is driven to rotate by the rising gas phase or gas-liquid mixture generated by the evaporation of the solution in the main pipe, and drives the scale removal turbulence paddle to rotate through the rotating main shaft.

3. A reboiler as claimed in claim 1, wherein: The scale removal and turbulence propeller has a spiral structure, with its outer edge fitting with the inner wall of the main pipe, and is used to agitate the solution and scrape the inner wall of the main pipe during rotation.

4. A reboiler as claimed in claim 1, wherein: The bottom of the self-opening and closing rotary valve cover is provided with conical sealing impact heads distributed in a ring, and the conical sealing impact heads form a conical surface fit with the inner wall of the air outlet at the top of the connecting seat.

5. A reboiler as claimed in claim 1, wherein: The outer edge of the self-opening and closing rotary valve cover is provided with annularly distributed guide grooves, which are used to guide the airflow to generate tangential force and drive the self-opening and closing rotary valve cover to rotate.

6. A reboiler as claimed in claim 1, wherein: The outer extension of the self-opening and closing rotary valve cover is also provided with annularly distributed outlet turbulence elements for turbulenting of the discharged gas phase or gas-liquid mixture.

7. A reboiler as claimed in claim 1, wherein: The self-opening and closing rotary valve cover is provided with a wear-resistant friction sleeve, and the wear-resistant friction sleeve and the friction mating shaft are in frictional contact with a gap.

8. A reboiler according to claim 7, wherein: The clearance fit between the wear-resistant friction sleeve and the friction mating shaft causes the self-opening and closing rotary valve cover to produce irregular tilting and swaying during rotation, which in turn causes micro-vibration.

9. A reboiler according to claim 8, wherein: The micro-vibration is transmitted to the rotating main shaft and the scale removal turbulence impeller through the friction-fitted shaft, and acts on the main pipe components.

10. A reboiler as claimed in claim 1, wherein: The self-opening rotary valve cover rises and opens after overcoming its own weight and frictional resistance with the help of steam pressure. Its opening range is positively correlated with the steam pressure, thus achieving adaptive adjustment.

11. A reboiler as claimed in claim 1, wherein: When the steam volume decreases, the self-opening and closing rotary valve cover falls due to gravity. When it falls, the conical sealing impact head makes impact contact with the inner wall of the air outlet at the top of the connecting seat, which is used to remove impurities attached to the air outlet.

12. A carbon disulfide rectification column characterized by, Includes the reboiler as described in any one of claims 1 to 11.

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