A gas evacuation device for a rectification column

Abstract

The application relates to a gas exhaust device of a rectifying tower, and belongs to the technical field of rectifying equipment. The structure of the gas exhaust device comprises a tower body and an exhaust unit. One side of the tower body is provided with a feeding port, the bottom of the tower body is provided with a reboiler, the reboiler is communicated with the tower body, a steam pipeline is arranged on the reboiler, a steam inlet valve is arranged on the steam pipeline, the top of the tower body is provided with an exhaust port, the exhaust unit comprises an exhaust assembly, a locking release mechanism and a driving mechanism, the exhaust assembly is arranged on the exhaust port, the locking release mechanism is arranged on the exhaust assembly, one end of the driving mechanism is connected to an operating part of the steam inlet valve, and the other end of the driving mechanism is connected to the locking release mechanism. The application has the technical effect of timely exhausting residual gas in the tower to avoid safety hazards.

Description

Technical Field

[0001] This application relates to the technical field of distillation equipment, and in particular to a gas venting device for a distillation column. Background Technology

[0002] During the operation of a distillation column, a certain amount of steam and non-condensable gases will be generated inside the column. In order to ensure the stability of the distillation process and the safety of the equipment, the relevant gases need to be discharged in a timely manner through a gas venting device. Especially when the system is shut down, if the residual steam and non-condensable gases in the column cannot be discharged in time, it can easily cause safety hazards. Therefore, the gas venting device is one of the key supporting components of a distillation column.

[0003] In the existing technology, the gas venting device of the distillation column is mostly an independently set manual valve structure. The operation of the steam inlet valve and the venting device is independent of each other, and the closure of the steam inlet valve and the opening of the venting device need to be controlled manually respectively. This type of structure has the problem of poor operation coordination and it is difficult to achieve a rapid venting response when the machine is shut down.

[0004] Regarding the aforementioned technologies, the applicant believes that there is a defect in that the residual gas inside the tower cannot be discharged in a timely manner after the tower stops operating. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a gas venting device for a distillation column.

[0006] This application provides a gas venting device for a distillation column, which adopts the following technical solution: A gas venting device for a distillation column includes a column body and a venting unit. A feed inlet is provided on one side of the column body, and a reboiler is provided at the bottom of the column body, communicating with the column body. A steam pipeline is provided on the reboiler, and a steam inlet valve is provided on the steam pipeline. A vent is provided at the top of the column body. The venting unit includes a venting assembly, a locking and releasing mechanism, and a driving mechanism. The venting assembly is located on the vent, and the locking and releasing mechanism is located on the venting assembly. One end of the driving mechanism is connected to the operating component of the steam inlet valve, and the other end of the driving mechanism is connected to the locking and releasing mechanism.

[0007] By adopting the above technical solution, the steam inlet valve closes during shutdown, and the venting component automatically opens through the drive mechanism, quickly releasing residual steam and non-condensable gases in the tower. This prevents overpressure buildup and leakage or damage to the tower body, flanges, and seals due to overpressure, and prevents backflow of air or material due to negative pressure caused by system cooling. It also avoids material contamination, equipment corrosion, and pipeline blockage or damage caused by backflow, reducing safety accidents caused by operational delays or misjudgments. It is especially suitable for distillation systems containing flammable, explosive, or toxic media, eliminating the risks of overpressure and backflow, and preventing the impact of abnormal pressure in the tower on core components such as trays, packing, reboilers, and condensers. This reduces equipment fatigue and maintenance frequency. The locking and releasing mechanism, in conjunction with the drive mechanism, allows for rapid pressure relief, preventing problems such as flooding and mist entrainment caused by pressure changes in the tower, reducing material waste and cleaning costs. It also enables precise opening and closing of the venting component, balancing sealing during normal operation and rapid venting during shutdown.

[0008] Preferably, the steam inlet valve includes an inlet valve body, an inlet valve core, an inlet valve stem, and a handle; one end of the inlet valve body is connected to the steam pipeline; the inlet valve core has a through hole in its center and is rotatably mounted in the inlet valve body; the inlet valve stem passes through the inlet valve body and is rotatably connected to the inlet valve body, with one end of the inlet valve stem fixedly mounted on the inlet valve core; the handle is fixedly mounted on the other end of the inlet valve stem.

[0009] By adopting the above technical solution, the inlet valve core achieves the connection and closure of the through hole and the valve body flow channel through rotation. The rotation angle is linearly related to the steam flow cross-sectional area. According to the heating requirements of the reboiler of the distillation column, the steam input flow rate is precisely adjusted to avoid drastic fluctuations in temperature and pressure inside the column caused by sudden changes in steam volume, thus ensuring the stability of the distillation process and the purity of product separation. The inlet valve core and the inner cavity of the inlet valve body adopt a surface contact fit. There is no wear of the sealing parts caused by reciprocating friction during the rotation opening and closing process. The sealing surface fits more tightly, which can effectively reduce steam leakage and reduce energy consumption.

[0010] Preferably, the inner wall of the through hole of the intake valve core is provided with a spiral guide groove.

[0011] By adopting the above technical solution, the spiral guide channel forces steam to flow along the spiral trajectory, forming a stable vortex, reducing sudden changes in flow velocity and flow channel resistance, reducing pressure fluctuations at the valve inlet and outlet, avoiding temperature and pressure oscillations in the tower caused by sudden changes in reboiler heating power, and ensuring stable mass transfer efficiency and product purity.

[0012] Preferably, the venting assembly includes a venting pipe, a venting baffle, and a venting shaft; one end of the venting pipe is connected to the venting port at the top of the distillation column; the venting shaft is fixedly disposed on one side of the venting baffle, and the venting shaft is rotatably disposed on the other end of the venting pipe; a locking part is provided on the other side of the venting baffle.

[0013] By adopting the above technical solution, the vent baffle rotates and engages with the vent pipe via a rotating shaft. When closed, it forms a surface seal with the vent pipe port, ensuring a tight fit and effectively preventing outside air from entering the column. This maintains the pressure and gas phase purity required for the distillation process and avoids product quality degradation caused by air interference. Simultaneously, the baffle's own weight and rotating fit design create an auxiliary seal, reducing the risk of gas leakage before shutdown and ensuring process stability. The locking mechanism on the side of the baffle can directly engage or disengage with the locking and releasing mechanism. When the drive mechanism triggers the release action with the steam valve handle rotation, the baffle can be quickly unlocked without additional structural modifications. The baffle opens via shaft rotation, precisely matching the timing of steam valve closure and vent opening, ensuring timely gas discharge from the column during shutdown and improving system safety response speed.

[0014] Preferably, the locking and releasing mechanism includes a locking hook and a return spring; one end of the locking hook is rotatably mounted on the vent pipe, and the other end of the locking hook is provided with a hook portion for cooperating with the locking portion of the vent baffle; one end of the return spring is rotatably mounted on the vent pipe, and the other end of the return spring is rotatably mounted on the locking hook.

[0015] By adopting the above technical solution, the reset spring always applies a continuous preload to the locking hook, ensuring that the hook part of the locking hook is tightly engaged with the locking part of the venting baffle. Even under interference from pressure fluctuations in the column, pipeline vibrations, etc., the baffle can be prevented from accidentally loosening or leaking, ensuring the stability of pressure and gas phase purity in the column during distillation, and preventing air infiltration from affecting product quality. When the drive mechanism triggers unlocking, the spring releases elastic potential energy, driving the locking hook to rotate quickly around the axis and disengage from the locking buckle. The baffle can be quickly unlocked without additional power, precisely matching the action rhythm of the steam valve closing and the venting opening, ensuring that the gas in the column is discharged in time when the system is shut down, and improving the system's safety response speed.

[0016] Preferably, the drive mechanism includes a flexible traction cable and a reel; the reel is fixedly mounted on the intake valve stem of the steam inlet valve; one end of the flexible traction cable is wound and fixed on the reel, and the other end of the flexible traction cable is disposed on the locking and releasing mechanism.

[0017] By adopting the above technical solution, the winding reel is coaxially fixed with the steam valve stem. When the valve rotates to close, the winding reel synchronously winds up the flexible traction cable, thereby pulling the trigger end of the locking hook to rotate, causing the hook to disengage from the locking part. This ensures that the closing of the steam inlet valve and the unlocking of the locking hook are strictly synchronized, avoiding venting delay. The linear speed during the winding process is linearly related to the valve stem speed. The required unlocking stroke can be matched by the diameter of the winding reel, achieving precise and controllable control of the locking hook rotation angle. This ensures stable opening of the baffle, improves the response accuracy and safety of shutdown venting, and allows for flexible arrangement of the traction cable. It is not limited by the installation position or height difference between the steam valve and the locking hook, and is suitable for the compact layout of the top of the distillation column, eliminating the need for complex rigid shaft transmission or guide structures. The flexibility of the traction cable can absorb mechanical vibration and installation errors, reducing the risk of jamming in the linkage mechanism, while avoiding stress concentration caused by rigid connections.

[0018] Preferably, a counterweight is provided on the outer side of the venting baffle; and a sealing gasket is provided on the inner side of the venting baffle.

[0019] By adopting the above technical solution, the steam inlet valve closes and the rear vent opens to begin venting. The timing of the steam valve closing and the locking hook unlocking is precisely matched to ensure smooth venting during shutdown. After venting is completed, the counterweight provides a continuous closing force, the steam inlet valve opens, and the locking hook presses the vent baffle against the vent pipe port through the return spring, improving sealing reliability. The sealing gasket can fill the gap between the baffle and the vent pipe port to form an elastic sealing surface, effectively preventing air from seeping into the tower or gas phase leakage from the tower.

[0020] Preferably, a condenser is provided on one side of the top of the tower body, and the condenser is in communication with the tower body.

[0021] By adopting the above technical solution, the condenser can quickly condense the gaseous material rising from the top of the column into a liquid phase, achieving efficient separation of the gas and liquid phases. On the one hand, a portion of the condensate can be returned to the column through reflux operation to replenish the liquid load in the column, enhance the mass and heat transfer effect, improve the separation accuracy of light and heavy components, and ensure that the product purity meets the standards. On the other hand, qualified distillates can be extracted to meet the process output requirements. The condensation process can effectively remove trace impurities from the gas phase, reduce the accumulation of impurities in the column, and avoid impurities affecting subsequent distillation conditions and product quality.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The inlet valve core achieves connection and closure between the through hole and the valve body flow channel through rotation. The rotation angle is linearly related to the steam flow cross-sectional area. According to the heating requirements of the reboiler of the distillation column, the steam input flow rate is precisely adjusted to avoid drastic fluctuations in temperature and pressure inside the column caused by sudden changes in steam volume, thus ensuring the stability of the distillation process and the purity of product separation. The inlet valve core and the inner cavity of the inlet valve body adopt a surface contact fit. There is no wear of the sealing parts caused by reciprocating friction during the rotation opening and closing process. The sealing surface fits more tightly, which can effectively reduce steam leakage and reduce energy consumption.

[0023] 2. The return spring always applies a continuous preload to the locking hook, ensuring a tight engagement between the hook and the venting baffle. Even under pressure fluctuations or pipeline vibrations, this prevents the baffle from loosening or leaking, ensuring stable pressure and gas purity within the distillation column and preventing air infiltration that could affect product quality. When the drive mechanism triggers unlocking, the spring releases its elastic potential energy, driving the locking hook to rotate rapidly around its axis and disengage from the latch. This allows for rapid unlocking of the baffle without additional power, precisely matching the timing of the steam valve closing and venting opening, ensuring timely gas discharge from the column during shutdown and improving system safety response speed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure in the embodiment.

[0025] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0026] Figure 3 This is a cross-sectional schematic diagram of the internal structure of the steam inlet valve in the embodiment.

[0027] Explanation of reference numerals in the attached drawings: 1. Tower body; 11. Feed inlet; 12. Exhaust port; 2. Exhaust unit; 21. Exhaust assembly; 211. Exhaust pipe; 212. Exhaust baffle; 2121. Locking part; 213. Exhaust shaft; 214. Counterweight; 215. Sealing gasket; 22. Locking release mechanism; 221. Locking hook; 222. Return spring; 23. Drive mechanism; 231. Flexible traction cable; 232. Winding reel; 3. Reboiler; 31. Steam pipeline; 32. Steam inlet valve; 321. Inlet valve body; 322. Inlet valve core; 3221. Through hole; 3222. Spiral guide groove; 323. Inlet valve stem; 324. Handle; 4. Condenser. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0029] This application discloses a gas venting device for a distillation column. (Refer to...) Figure 1The system includes a tower body 1 and a venting unit 2. A feed inlet 11 is located on one side of the tower body 1, and a reboiler 3 is located at the bottom of the tower body 1, connected to the tower body 1. A steam pipe 31 is installed on the reboiler 3, and a steam inlet valve 32 is installed on the steam pipe 31. A venting port 12 is located at the top of the tower body 1. The venting unit 2 includes a venting assembly 21, a locking and releasing mechanism 22, and a driving mechanism 23. The venting assembly 21 is located on the venting port 12, and the locking and releasing mechanism 22 is located on the venting assembly 21. One end of the driving mechanism 23 is connected to the operating component of the steam inlet valve 32, and the other end of the driving mechanism 23 is connected to the locking and releasing mechanism 22. A condenser 4 is installed on one side of the top of the tower body 1, and the condenser 4 is connected to the tower body 1. The material enters the tower body 1 through the feed inlet 11. The reboiler 3 heats the material in the tower body 1 with steam input through the steam pipeline 31. The generated gas phase rises to the top of the tower body 1 and is condensed by the condenser 4 to achieve gas-liquid separation. During normal operation, the locking and releasing mechanism 22 locks and seals the venting component 21 to ensure stable process pressure in the tower body 1. When the steam inlet valve 32 is closed and the steam supply is stopped, the drive mechanism 23 connected to the valve operating component moves synchronously, triggering the locking and releasing mechanism 22 to unlock, and the venting component 21 opens to promptly discharge residual steam and non-condensable gas in the tower body 1.

[0030] Reference Figure 1 and Figure 3 The steam inlet valve 32 includes an inlet valve body 321, an inlet valve core 322, an inlet valve stem 323, and a handle 324. One end of the inlet valve body 321 is connected to the steam pipeline 31. The inlet valve core 322 has a through hole 3221 in its center and is rotatably mounted inside the inlet valve body 321. The inlet valve stem 323 passes through the inlet valve body 321 and is rotatably connected to the inlet valve body 321. One end of the inlet valve stem 323 is fixedly mounted on the inlet valve core 322. The handle 324 is fixedly mounted on the other end of the inlet valve stem 323. The inner wall of the through hole 3221 of the inlet valve core 322 is provided with a spiral guide groove 3. 222; Rotating the handle 324 drives the intake valve rod 323 to rotate synchronously, thereby driving the intake valve core 322 inside the intake valve body 321 to rotate; When the through hole 3221 in the center of the intake valve core 322 is aligned with the flow channel of the intake valve body 321, steam flows in through the pipeline and forms a stable vortex through the spiral guide groove 3222 on the inner wall of the through hole 3221, and enters the reboiler 3 evenly to heat the distillation column; When rotating the handle 324 causes the valve core through hole 3221 to be misaligned with the valve body flow channel, the steam passage is closed and the heating is stopped; At the same time, the rotation of the intake valve rod 323 will synchronously drive the drive mechanism 23 to move, providing triggering power for the subsequent unlocking of the venting unit 2.

[0031] Reference Figure 1 and Figure 2The venting assembly 21 includes a venting pipe 211, a venting baffle 212, and a venting shaft 213; one end of the venting pipe 211 is connected to the venting port 12 at the top of the distillation column; the venting shaft 213 is fixedly mounted on one side of the venting baffle 212, and rotatably mounted on the other end of the venting pipe 211; a locking part 2121 is provided on the other side of the venting baffle 212, a counterweight 214 is provided on the outer side of the venting baffle 212, and a sealing gasket 215 is provided on the inner side of the venting baffle 212; the locking and releasing mechanism 22 includes a locking hook 213. 21 and a return spring 222; one end of the locking hook 221 is rotatably mounted on the vent pipe 211, and the other end of the locking hook 221 is provided with a hook for cooperating with the locking part 2121 of the vent baffle 212; one end of the return spring 222 is rotatably mounted on the vent pipe 211, and the other end of the return spring 222 is rotatably mounted on the locking hook 221; the drive mechanism 23 includes a flexible traction cable 231 and a winding reel 232; the winding reel 232 is fixedly mounted on the air inlet valve stem 323 of the steam inlet valve 32; one end of the flexible traction cable 231 is wound The flexible traction cable 231 is wound and fixed on the reel 232, and the other end is set on the locking hook 221 in the locking and releasing mechanism 22; the return spring 222 drives the hook part of the locking hook 221 to engage with the locking part 2121 of the vent baffle 212, and the vent baffle 212 is tightly fitted with the vent pipe 211 through the sealing gasket 215 on the inner side to achieve the sealing of the vent port 12; the reel 232 of the drive mechanism 23 remains stationary with the air inlet valve rod 323, and the flexible traction cable 231 is in a relaxed state; when the handle 324 is turned to close the steam inlet valve 3 At time 2, the intake valve rod 323 drives the winding wheel 232 to rotate synchronously, winding the flexible traction cable 231 and pulling the locking hook 221 to rotate, forcing the hook to disengage from the locking part 2121, thus completing the unlocking; the venting baffle 212 unlocks and rotates, and the residual gas in the tower body 1 is discharged through the venting pipe 211. When the system restarts, the handle 324 is rotated in the opposite direction to open the steam inlet valve 32, the winding wheel 232 releases the flexible traction cable 231, the locking hook 221 is reset under the action of the return spring 222, re-engages the locking part 2121, and the venting baffle 212 returns to its sealed position.

[0032] The working principle of the gas venting device of the distillation column in this application is as follows: Rotating the handle 324 of the steam inlet valve 32 causes the inlet valve rod 323 and the inlet valve core 322 inside the valve body to rotate synchronously, aligning the through hole 3221 in the center of the inlet valve core 322 with the flow channel of the inlet valve body 321. The steam pipeline 31 is then open. When the steam flows through the through hole 3221 of the inlet valve core 322, a stable vortex is formed under the action of the spiral guide groove 3222 on the inner wall of the through hole 3221. This vortex uniformly enters the reboiler 3 at the bottom of the column, heating the material inside the column 1. The gas phase generated after the material is heated rises to the top of the column 1 and is condensed by the condenser 4 to achieve gas-liquid separation. After completing the distillation process, during this stage, the steam inlet valve stem 323 of the steam inlet valve 32 remains stationary, the winding wheel 232 of the drive mechanism 23 does not rotate, and the flexible traction cable 231 is in a relaxed state. The return spring 222 of the locking and releasing mechanism 22 drives the hook of the locking hook 221 to engage with the locking part 2121 of the vent baffle 212. The vent baffle 212 is tightly fitted to the vent pipe 211 through the sealing gasket 215 on its inner side, achieving a sealed lock of the vent port 12 and ensuring stable process pressure inside the tower body 1. When it is necessary to stop heating, the handle 324 is rotated in the reverse direction, driving the steam inlet valve stem 323 and the steam inlet valve core 322 to rotate, so that the steam inlet valve can be stopped. When the through hole 3221 on the valve core 322 is misaligned with the flow channel of the inlet valve body 321, the steam pipe 31 is closed, the reboiler 3 stops supplying heat, and as the inlet valve rod 323 rotates, it simultaneously drives the winding wheel 232 fixed on the inlet valve rod 323 to rotate. The winding wheel 232 winds up the flexible traction cable 231, which pulls the locking hook 221 of the locking and releasing mechanism 22 to rotate, forcing the hook of the locking hook 221 to disengage from the locking part 2121 of the vent baffle 212, thus completing the unlocking action. After the vent baffle 212 is freed from the constraint of the locking hook 221, the residual steam and non-condensable gas in the tower body 1 are discharged in time through the vent pipe 211. When the distillation column needs to be restarted, the handle 324 is turned forward, which drives the inlet valve core 322 to reset, so that the through hole 3221 is realigned with the flow channel of the inlet valve body 321, the steam pipeline 31 is reopened, and the reboiler 3 resumes heating. At the same time, the inlet valve rod 323 drives the winding wheel 232 to rotate in the opposite direction, releasing the flexible traction cable 231. The locking hook 221 is reset under the elastic force of the reset spring 222, and the hook part of the locking hook 221 is re-engaged with the locking part 2121 of the vent baffle 212. The vent baffle 212 returns to its original position and seals against the vent pipe 211, the vent port 12 is closed, and the system returns to the sealed state of normal operation.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas venting device for a distillation column, characterized in that: The system includes a tower body (1) and a venting unit (2). A feed inlet (11) is provided on one side of the tower body (1), and a reboiler (3) is provided at the bottom of the tower body (1). The reboiler (3) is connected to the tower body (1). A steam pipeline (31) is provided on the reboiler (3), and a steam inlet valve (32) is provided on the steam pipeline (31). A venting port (12) is provided at the top of the tower body (1). The venting unit (2) includes a venting component (21), a locking and releasing mechanism (22), and a driving mechanism (23). The venting component (21) is provided on the venting port (12), and the locking and releasing mechanism (22) is provided on the venting component (21). One end of the driving mechanism (23) is connected to the operating component of the steam inlet valve (32), and the other end of the driving mechanism (23) is connected to the locking and releasing mechanism (22).

2. The gas venting device for a distillation column according to claim 1, characterized in that: The steam inlet valve (32) includes an inlet valve body (321), an inlet valve core (322), an inlet valve stem (323), and a handle (324); one end of the inlet valve body (321) is connected to the steam pipeline (31); the inlet valve core (322) has a through hole (3221) in the center, and the inlet valve core (322) is rotatably disposed in the inlet valve body (321); the inlet valve stem (323) passes through the inlet valve body (321), and the inlet valve stem (323) is rotatably connected to the inlet valve body (321), and one end of the inlet valve stem (323) is fixedly disposed on the inlet valve core (322); the handle (324) is fixedly disposed on the other end of the inlet valve stem (323).

3. The gas venting device for a distillation column according to claim 2, characterized in that: The inner wall of the through hole (3221) of the intake valve core (322) is provided with a spiral guide groove (3222).

4. The gas venting device for a distillation column according to claim 1, characterized in that: The venting assembly (21) includes a venting pipe (211), a venting baffle (212), and a venting shaft (213); one end of the venting pipe (211) is connected to the venting port (12) at the top of the distillation column; the venting shaft (213) is fixedly disposed on one side of the venting baffle (212), and the venting shaft (213) is rotatably disposed on the other end of the venting pipe (211); a locking part (2121) is provided on the other side of the venting baffle (212).

5. The gas venting device for a distillation column according to claim 4, characterized in that: The locking and releasing mechanism (22) includes a locking hook (221) and a return spring (222); one end of the locking hook (221) is rotatably mounted on the drain pipe (211), and the other end of the locking hook (221) is provided with a hook for cooperating with the locking part (2121) of the drain baffle (212); one end of the return spring (222) is rotatably mounted on the drain pipe (211), and the other end of the return spring (222) is rotatably mounted on the locking hook (221).

6. The gas venting device for a distillation column according to claim 2, characterized in that: The drive mechanism (23) includes a flexible traction cable (231) and a reel (232); the reel (232) is fixedly installed on the air intake valve stem (323) of the steam inlet valve (32); one end of the flexible traction cable (231) is wound and fixed on the reel (232), and the other end of the flexible traction cable (231) is disposed on the locking and releasing mechanism (22).

7. The gas venting device for a distillation column according to claim 4, characterized in that: The outer side of the venting baffle (212) is provided with a counterweight (214); the inner side of the venting baffle (212) is provided with a sealing gasket (215).

8. The gas venting device for a distillation column according to claim 1, characterized in that: A condenser (4) is provided on one side of the top of the tower body (1), and the condenser (4) is connected to the tower body (1).

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