A continuous rectification recovery device for dipropylene glycol

Abstract

The utility model discloses a kind of dipropylene glycol continuous rectification recovery devices, it is related to continuous rectification technical field, including, recovery device main body, contain rectifying kettle and the tray being set in rectifying kettle inside, and the surface of multiple trays is provided with the through-hole for gas flow, the top surface of tray is formed with liquid storage space, conveying wheel, it is rotatably connected in the inside of through-hole, and conveying wheel impeller is located in the inside of liquid storage space, with inclined plate to steam is guided, to guide steam to the surface of conveying wheel impeller, and then steam promotes conveying wheel to rotate, to move the liquid in the inside of liquid storage space, to make liquid whole flow by the promotion of impeller, not fully contacted "fresh" liquid is continuously supplemented to the above of through-hole, avoid local liquid to reduce separation effect due to mass transfer saturation, ensure that the liquid of all areas on tray can participate in effective mass transfer, improve mixing efficiency and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of continuous distillation technology, specifically to a dipropylene glycol continuous distillation and recovery device. Background Technology

[0002] Distillation is a separation process that uses the different volatility of components in a mixture to separate the components. Commonly used equipment includes plate distillation columns and packed distillation columns. The principle and equipment process of precision distillation are the same as those of ordinary distillation, except that the relative volatility of the components in the system to be separated is relatively small. Therefore, high-efficiency precision packing is used to achieve the separation and purification of the components to be separated.

[0003] In distillation recovery processes, the tray is the core component for achieving gas-liquid mass transfer separation, and its performance directly affects distillation efficiency. The gas and liquid phases need to come into contact and mix through the perforations on the tray, a process that is crucial for component separation.

[0004] In traditional column trays, a certain amount of liquid accumulates on the tray surface during operation. When gas flows upward through the perforations, it comes into contact with the liquid on the tray surface and mixes. However, as the amount of liquid accumulated on the tray reaches a certain level, the liquid flow velocity on the tray slows down, resulting in a decrease in the overall flow rate of the mixed gas and liquid. The mixed liquid tends to accumulate near the perforations, preventing sufficient and efficient mass transfer between the gas and liquid phases, ultimately leading to a decrease in mixing efficiency and affecting the separation effect of distillation recovery. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a continuous dipropylene glycol distillation and recovery device.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A continuous distillation and recovery apparatus for dipropylene glycol includes:

[0008] The main body of the recovery device includes a distillation kettle and a tray disposed inside the distillation kettle, and the surface of a plurality of the trays is provided with through holes for gas flow, and a liquid storage space is formed on the top surface of the trays.

[0009] A conveyor wheel is rotatably connected inside the through hole, and the impeller of the conveyor wheel is located inside the liquid storage space;

[0010] An inclined plate is connected to the inner wall of the through hole, and the inclined end of the inclined plate faces the impeller of the conveyor wheel;

[0011] When the gas passes through the through hole, the inclined plate guides the gas to the surface of the conveyor impeller, and the impeller is driven by the gas to rotate the conveyor wheel.

[0012] Preferably, the impeller of the conveyor wheel has arc-shaped blades, and the surface of the blades is uniformly distributed with hemispherical micro-protrusions.

[0013] Preferably, the angle between the inclined plate and the inner wall of the through hole is 35°-50°, and the free end of the inclined plate extends to 1 / 3-1 / 2 of the radius of the conveyor impeller.

[0014] Preferably, the upper surface of the inclined plate is provided with a guide groove extending along the length direction, and the cross-section of the guide groove is V-shaped.

[0015] Preferably, in the initial state, the impeller of the conveyor wheel is parallel to the top of the through hole, and the surface of the impeller is horizontal to the top surface of the tower plate.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The steam is guided by an inclined plate to the surface of the conveyor impeller, which in turn drives the conveyor to rotate, moving the liquid inside the storage space. The impeller's movement causes the liquid to flow as a whole, continuously replenishing the "fresh" liquid that has not yet been fully contacted to the area above the through-hole. This prevents localized liquid from becoming saturated and reducing the separation effect, ensuring that all areas of the tray can participate in effective mass transfer, thus improving mixing and production efficiency. Attached Figure Description

[0018] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall cross-sectional planar structure of this utility model;

[0021] Figure 3 This utility model Figure 2 Enlarged planar structural diagram at point A.

[0022] The diagram shows: 1. Main body of the recovery unit; 11. Distillation kettle; 12. Reboiler at the bottom of the column; 13. Condenser at the top of the column; 14. Tray; 2. Conveyor wheel; 3. Inclined plate. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] Example

[0025] like Figure 1-3 As shown, a continuous distillation and recovery apparatus for dipropylene glycol includes:

[0026] The main body 1 of the recovery device includes a distillation kettle 11 and a tray 14 disposed inside the distillation kettle 11. The surface of the tray 14 is provided with through holes for gas flow, and the top surface of the tray 14 forms a liquid storage space.

[0027] The conveyor wheel 2 is rotatably connected inside the through hole, and the impeller of the conveyor wheel 2 is located inside the liquid storage space;

[0028] Inclined plate 3 is connected to the inner wall of the through hole, and the inclined end of inclined plate 3 faces the impeller of the conveyor wheel 2.

[0029] When the gas passes through the through hole, the inclined plate 3 guides the gas to the impeller surface of the conveyor wheel 2. The impeller is driven by the gas, and the conveyor wheel 2 rotates.

[0030] Specifically, when distillation is required, dipropylene glycol gas is directly fed into the distillation vessel 11. At this time, the bottom reboiler 12 is activated to heat the dipropylene glycol entering the distillation vessel 11. The heated vapor flows upward through the through holes in the tray 14. The vapor flowing to the top is condensed by the top condenser 13. After condensation, the condensed water is directly fed into the liquid storage space on the tray 14 through the top condenser 13, where it comes into contact with the vapor coming from the through holes. After contact, the lighter components flow upward, while the heavier components remain in the liquid storage space. Then, the liquid flows back down to the bottom of the distillation vessel 11 through the tray 14, thus completing the distillation.

[0031] Specifically, in the above process, when the gas passes through the through hole, the inclined plate 3 guides the gas. Guided by the inclined plate 3, the gas moves along it. During this movement, the area available for gas flow gradually decreases due to the obstruction of the inclined plate 3, and the gas flow rate gradually increases, thus impacting the impeller surface of the conveyor wheel 2. At this time, the impeller, under increased pressure at the bottom, experiences an upward push and the thrust of the gas flow. The combined force of these two forces exceeds the obstruction force of the liquid inside the storage space, thus driving the conveyor wheel 2 to rotate. As the conveyor wheel 2 rotates, the gas flows through the gaps between the impellers into the storage space, coming into contact with dipropylene glycol. After contact, the dipropylene glycol moves within the storage space under the rotation of the impeller. The dipropylene glycol at the rear moves to the top of the through hole and then comes into contact with the steam again. The impeller's pushing action causes the entire liquid to flow, removing any insufficiently contacted "fresh" gas. Liquid is continuously replenished above the through hole to prevent local liquid from reducing the separation effect due to mass transfer saturation. This ensures that liquid in all areas of the tray 14 can participate in effective mass transfer, thereby improving mixing efficiency and production efficiency.

[0032] In this implementation example: the impeller of the transmission wheel 2 has arc-shaped blades, and the surface of the blades is evenly distributed with hemispherical micro-protrusions.

[0033] Specifically, the curved blades conform to the streamlined trajectory of gas flow. Compared with straight blades, they can more smoothly receive the high-speed gas guided by the inclined plate 3. When the gas impacts the blades, the curved surface can disperse the impact force and guide it to flow along the blade surface, reducing the kinetic energy loss caused by the gas "impact rebound". At the same time, the curved structure can increase the contact area between the blades and the gas, making the impeller easier to drive, increasing the rotation speed, providing stronger power for subsequent liquid agitation, improving the utilization rate of gas kinetic energy, improving the impeller drive efficiency, and ensuring that the impeller can rotate in the liquid. Meanwhile, the micro-protrusions can break the liquid into smaller droplets, enhance the "micro-turbulence" effect of gas-liquid contact, and improve mass transfer efficiency.

[0034] In this embodiment, the angle between the inclined plate 3 and the inner wall of the through hole is 35°-50°, and the free end of the inclined plate 3 extends to 1 / 3-1 / 2 of the radius of the impeller of the conveyor wheel 2.

[0035] Specifically, an angle of 35°-50° ensures that the inclined plate 3 guides the gas. If the angle is too small, the guiding effect of the inclined plate 3 on the gas is weak, and the gas is easy to disperse around the through hole, making it difficult to concentrate and impact the impeller. Or if the angle is too large, the inclined plate 3 will block the gas too much, which will cause the gas flow resistance to increase sharply, thus weakening the flow velocity. At the same time, the free end extends to the radius of the impeller 1 / 3-1 / transmission wheel 2, which corresponds exactly to the "high-efficiency force zone" of the impeller. This area is the critical point of balance between the lever arm and torque when the impeller rotates. When the gas impacts here, the kinetic energy can be converted into the rotational torque of the impeller to the maximum extent, ensuring that the impeller obtains a higher speed under the same gas flow, accurately controlling the gas impact position, avoiding "ineffective impact", and thus providing a guarantee for the rotation of the transmission wheel 2.

[0036] In this embodiment: the upper surface of the inclined plate 3 is provided with a guide groove extending along the length direction, and the cross section of the guide groove is V-shaped.

[0037] Specifically, when the rising gas flows along the surface of the inclined plate 3, the V-shaped guide channel can confine the liquid within the channel to form a "liquid flow bundle," while the gas flows at high speed in the ridge region between the channels, forming a unidirectional contact path where "gas rises along the ridge and liquid flows down along the bottom of the channel." This structure makes the gas-liquid interface more concentrated and extends the contact time, making it easier for the light components in the liquid to be carried and separated by the gas. At the same time, the inclined surfaces on both sides of the V-shaped channel can guide some of the gas to "obliquely impact" the liquid flow in the channel, forming a local vortex, further breaking up the liquid flow, increasing the gas-liquid contact area, and significantly improving the single mass transfer efficiency.

[0038] In this embodiment: In the initial state, the impeller of the conveyor wheel 2 is parallel to the top of the through hole, and the impeller surface is horizontal to the top surface of the tower plate 14.

[0039] Specifically, in the initial stage of dipropylene glycol distillation, the liquid volume in the storage space is relatively small, and the gas flow rate gradually increases from the main body 1 of the recovery device. If the impeller is initially tilted or higher or lower than the surface of the tray 14, it may be misaligned with the top of the through hole or form a height difference with the surface of the tray 14, resulting in uneven force when the gas impacts the impeller, increasing the starting resistance. However, if the impeller is parallel to the top of the through hole and the surface is horizontal, the initial gas guided by the inclined plate 3 can evenly impact the horizontal surface of the impeller, and the force transmission direction is perpendicular to the impeller plane, reducing the component force loss caused by the angle deviation. This allows the impeller to start rotating at a lower gas flow rate, achieving "low energy consumption and fast response", avoiding the problem of inefficient gas-liquid contact caused by the impeller not rotating in the initial stage, reducing the initial starting resistance, and ensuring the rapid response of the conveyor wheel 2.

[0040] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A continuous distillation and recovery apparatus for dipropylene glycol, characterized in that: include: The main body of the recovery device includes a distillation kettle and a tray disposed inside the distillation kettle, and the surface of a plurality of the trays is provided with through holes for gas flow, and a liquid storage space is formed on the top surface of the trays. A conveyor wheel is rotatably connected inside the through hole, and the impeller of the conveyor wheel is located inside the liquid storage space; An inclined plate is connected to the inner wall of the through hole, and the inclined end of the inclined plate faces the impeller of the conveyor wheel; When the gas passes through the through hole, the inclined plate guides the gas to the surface of the conveyor impeller, and the impeller is driven by the gas to rotate the conveyor wheel.

2. The dipropylene glycol continuous distillation and recovery apparatus according to claim 1, characterized in that: The impeller of the transmission wheel has arc-shaped blades, and the surface of the blades is evenly distributed with hemispherical micro-protrusions.

3. The dipropylene glycol continuous distillation and recovery apparatus according to claim 2, characterized in that: The angle between the inclined plate and the inner wall of the through hole is 35°-50°, and the free end of the inclined plate extends to 1 / 3-1 / 2 of the radius of the conveyor impeller.

4. The dipropylene glycol continuous distillation and recovery apparatus according to claim 3, characterized in that: The upper surface of the inclined plate is provided with a guide groove extending along the length direction, and the cross-section of the guide groove is V-shaped.

5. The dipropylene glycol continuous distillation and recovery apparatus according to claim 4, characterized in that: In the initial state, the impeller of the conveyor wheel is parallel to the top of the through hole, and the surface of the impeller is horizontal to the top surface of the tower plate.

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