A distillation tower for producing sustainable aviation fuel

Abstract

The invention relates to the technical field of distillation towers, and specifically discloses a distillation tower for producing sustainable aviation fuel, comprising a tower body and a tower plate, wherein an overflow weir is arranged on the tower plate, the tower plate, the tower body and the overflow weir form a receiving tank for receiving reflux liquid, a plurality of bubble cap mechanisms are arranged on the tower plate, the bubble cap mechanism comprises a fixed sleeve and a movable cover, the fixed sleeve has an opening at the top and is fixed on the tower plate, the movable cover has a closed top and an opening at the bottom and is sealed and slidably assembled in the fixed sleeve along the up and down directions, an elastic member for pulling the movable cover downward is arranged between the movable cover and the fixed sleeve, and an air inlet pipe extending into the movable cover is arranged on the tower plate; the present invention stores gas in the bubble cap mechanism first and then contacts the reflux liquid by arranging the movable cover and the elastic member, so that the contact time between the gas phase and the liquid phase is longer, so that the bubbles are divided into a plurality of small bubbles when they rise through a support frame, so that the contact area between the gas phase and the liquid phase is larger, and the distillation effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of distillation towers, and in particular to a distillation tower for producing sustainable aviation fuel. Background Art

[0002] A distillation tower is a tower-type vapor-liquid contact device for distillation. A distillation tower is usually composed of a tower body, a tower plate, a feed port, a reflux port, a distillation port, and other parts. Reflux can increase the flow rate of the liquid phase in the tower, thereby increasing the flow rate of the liquid phase on the tower plate and reducing the stagnation time of the liquid phase on the tower plate, which helps to improve the separation efficiency of the tower plate. The reflux liquid contacts the rising steam on the tower plate. After contact with the steam, part of the liquid will be carried up by the steam, while the other part will flow to the next tower plate as reflux liquid through the overflow weir on the tower plate. In this process, the gas and liquid are exchanged, the lighter components will be transferred from the liquid phase to the gas phase, and the heavier components will remain in the liquid phase, thereby achieving the purpose of separation.

[0003] The Chinese patent document with the authorization announcement number CN116328340B discloses a multi-stage liquid phase material distillation equipment with high separation efficiency. The invention relates to the technical field of distillation equipment, including a distillation tower, a liquid inlet pipe is fixedly connected to the left side of the distillation tower, a collecting pipe is fixedly connected to the upper side of the distillation tower, a reflux pipe is fixedly connected to the upper part of the side wall of the distillation tower, a discharge pipe is fixedly connected to the lower side of the distillation tower, and an air inlet pipe is fixedly connected to the lower part of the side wall of the distillation tower. The liquid inlet pipe, the collecting pipe, the reflux pipe, the discharge pipe, and the air inlet pipe all connect the inside of the distillation tower with the outside of the distillation tower. A bubble cap mechanism is arranged on the tower plate, and the bubble cap mechanism includes a bubble cap buckled on the tower plate.

[0004] In the distillation equipment of the above patent document, after the mixed raw materials are heated by the distillation tower, the gas is input into the condenser for re-condensation and liquefaction, and the liquid is input into the reboiler for re-vaporization, and the gas is input from the bottom of the tower again, and the liquid is input from the top of the tower again, so that the gas phase and the liquid phase are contacted by countercurrent, thereby being purified. However, in this contact mode, the heavy phase remains in the reflux liquid, resulting in a higher concentration of the heavy phase in the reflux liquid. Although there is a certain overflow, the flow performance at the bottom is poor, resulting in a gradual increase in the concentration of the heavy phase at the bottom, reducing the mass exchange efficiency. Summary of the invention

[0005] The present invention provides a distillation tower for producing sustainable aviation fuel, aiming to solve the problem of low distillation efficiency of the distillation tower in the related art.

[0006] A distillation tower for producing sustainable aviation fuel, comprising a tower body and a tower plate, wherein an overflow weir is arranged on the tower plate, wherein the tower plate, the tower body and the overflow weir form a receiving tank for receiving reflux liquid, wherein a plurality of bubble cap mechanisms are arranged on the tower plate, wherein the bubble cap mechanisms comprise a fixed sleeve and a movable sleeve, wherein the fixed sleeve has an opening at the top and is fixed on the tower plate, wherein the movable sleeve has a closed top and an opening at the bottom and is sealed and slidably assembled in the fixed sleeve along the up-down direction, wherein an elastic member for pulling the movable sleeve downward is arranged between the movable sleeve and the fixed sleeve, wherein an air inlet pipe extending into the movable sleeve is arranged on the tower plate, wherein a vent hole is arranged on the side wall of the fixed sleeve, wherein the vent hole is communicated with the inside of the movable sleeve, and wherein the top of the overflow weir is higher than the vent hole, so as to allow the reflux liquid to enter the fixed sleeve;

[0007] A flap is fixedly mounted on the outside of the movable cover, and the flap is located in the accommodating groove;

[0008] The air inlet pipe supplies gas to enter the fixed sleeve to push the movable cover upward and press the reflux liquid in the fixed sleeve into the receiving groove through the air vent; when the liquid level in the fixed sleeve drops to the air vent, the gas is ejected from the air vent, and the elastic member pulls the movable cover downward to reset and move the flap to below the air vent.

[0009] The beneficial effects of the present invention are as follows: by arranging a movable cover and an elastic member, the gas exists in the bubble mechanism for a longer time, the contact time between the gas phase and the liquid phase is longer, and the distillation effect is better; the movable cover moves upward so that the flap pushes the reflux liquid upward, causing the saturated reflux liquid to flow away, and the gas is cut into small bubbles by the flap during the upward outflow process, so the contact area between the gas and the reflux liquid is larger, and the distillation effect is better.

[0010] Preferably, the flap is slidably sleeved on the outside of the fixed sleeve along the up-down direction, and a connecting rod is provided between the flap and the movable cover so that the flap pushes the reflux liquid at the bottom of the tower plate upward when moving upward.

[0011] Preferably, the flap includes a support frame and a rotating frame, the support frame is connected to the connecting rod, the rotating frame is toothed and can be rotated upward on the support frame, the support frame is provided with tooth grooves, and the rotating frame and the tooth grooves are meshed with each other, so that the reflux liquid is pushed upward when the flap is pushed upward, and when the flap moves downward, it contacts the bubbles and divides the bubbles into small bubbles.

[0012] Preferably, a protrusion for contacting the rotating frame is fixed in the tooth groove, and a groove cooperating with the protrusion is formed on the lower end surface of the rotating frame; the movable cover places the rotating frame in the tooth groove during the upward movement of the rotating frame, and the rotating frame rotates during the downward movement of the movable cover.

[0013] Preferably, the elastic member is a spring, one end of the spring is connected to the fixed sleeve, and the other end of the spring is connected to the movable cover; when the gas escapes from the bubble mechanism, the spring pulls the movable cover downward.

[0014] Preferably, a plurality of the air holes are evenly distributed along the circumference of the fixing sleeve, and the plurality of the air holes are arranged at intervals; by providing a plurality of air holes, the gas in the bubble mechanism can be released faster.

[0015] Preferably, a guide groove for accommodating the end of the movable cover is provided on the tower plate, and the width of the guide groove is greater than the wall thickness of the movable cover, so as to avoid the movable cover failing to descend in time.

[0016] Preferably, a one-way valve is provided in the air inlet pipe to prevent the gas in the bubble mechanism from flowing back into the air inlet pipe.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0018] 1. Gas is introduced into the bubble mechanism through the air inlet pipe, and the movable cover moves upward and stretches the elastic member. After the elastic member is stretched to a certain length, the gas pressure in the bubble mechanism increases and presses down the liquid level of the reflux liquid in the bubble mechanism until the liquid level drops below the air permeable hole. At this time, the pressure in the bubble mechanism drops instantly. Under the action of the spring tension, the movable cover drops, the liquid level in the bubble mechanism rises, and the gas escaping from the bubble mechanism rises and contacts with the reflux liquid. In the above process, the gas is first stored in the bubble mechanism and then contacts with the reflux liquid. The contact time between the gas phase and the liquid phase is longer, and the distillation effect is better.

[0019] 2. When the movable hood moves upward, it drives the flap to rise, and pushes the saturated liquid at the bottom of the reflux liquid upward and flows away with the reflux liquid. At the same time, when the movable hood descends, the rotating frame rotates on the supporting frame. When the bubbles rise and pass through the supporting frame, they are divided into multiple small bubbles, so that the contact area between the gas phase and the liquid phase is larger, and the distillation effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural schematic diagram of the interior of the distillation tower of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the bubble cap mechanism of the present invention arranged on a tower plate.

[0022] Figure 3 It is a structural schematic diagram of the flap of the present invention in an unfolded state.

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of the structure enlarged at point A in the middle.

[0024] Figure 5 It is a schematic diagram of the structure inside the blister of the present invention.

[0025] Figure numerals: 1. tower plate; 2. overflow weir; 3. bubble mechanism; 31. fixed sleeve; 32. movable cover; 33. air vent; 34. elastic member; 4. flap; 41. support frame; 42. rotating frame; 43. tooth groove; 44. connecting rod; 45. protrusion; 46. groove; 5. air inlet pipe; 6. one-way valve; 7. guide groove. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] like Figure 1-Figure 5 As shown, a distillation tower for producing sustainable aviation fuel includes a tower plate 1, an overflow weir 2, a bubble cap mechanism 3, a flap 4 and an air inlet pipe 5.

[0028] The tower plate 1 is arranged in multiple layers from top to bottom along the tower body of the distillation tower. The reflux liquid flows out from top to bottom, and the gas flows upward from the bottom of the tower body. The tower plate 1, the tower body, and the overflow weir 2 form a holding tank for holding the reflux liquid. The gas passes through multiple holding tanks during the upward flow process, so that the gas contacts the reflux liquid for purification.

[0029] A plurality of bubble cap mechanisms 3 are provided on each tower plate 1, and the bubble cap mechanisms 3 include a fixed sleeve 31 and a movable cover 32. The fixed sleeve 31 is open at the top and fixed on the tower plate 1, and the movable cover 32 is closed at the top and open at the bottom and is sealed and slidably assembled in the fixed sleeve 31 along the up and down directions. An elastic member 34 for pulling the movable cover 32 downward is provided between the movable cover 32 and the fixed sleeve 31. An air hole 33 is provided on the side wall of the fixed sleeve 31, and the air hole 33 is connected to the inside of the movable cover 32. The top of the overflow weir 2 is higher than the air hole 33 to allow the reflux liquid to enter the fixed sleeve 31.

[0030] In a preferred embodiment of the present invention, the elastic member 34 is a spring, one end of the spring is connected to the fixed sleeve 31 , and the other end of the spring is connected to the movable cover 32 .

[0031] In other embodiments of the present invention, the elastic member 34 may also be an elastic rope, one end of which is connected to the fixed sleeve 31 , and the other end of which is connected to the movable cover 32 .

[0032] Since the top of the overflow weir 2 is higher than the air vent 33, a closed space is formed between the movable cover 32 and the reflux liquid. When gas enters the closed space, the pressure in the closed space increases, causing the movable cover 32 to move upward and the elastic member 34 to stretch. When the elastic member 34 stretches to a certain extent, the pressure in the closed space causes the liquid level to drop. When the liquid level drops below the air vent 33, the air pressure in the closed space leaks out, the closed space loses pressure instantly, and the elasticity shrinks. The liquid level in the closed space gradually recovers to a height that is basically flush with the overflow weir 2. The gas leaked from the closed space passes through the reflux liquid and flows to the upper tower plate 1. During the period of time when the gas exists in the closed space, the gas can exchange substances in the gas phase and liquid phase with the reflux liquid, thereby purifying it. During the process of the gas escaping from the reflux liquid, the gas phase and liquid phase are exchanged with the reflux liquid again for further purification.

[0033] The middle part of the flap 4 has an annular through hole, and the flap 4 is sleeved on the outside of the fixed sleeve 31. The inner wall of the annular through hole contacts the outer periphery of the fixed sleeve 31. The flap 4 includes a support frame 41 and a rotating frame 42. A connecting rod 44 is connected between the support frame 41 and the movable cover 32. The rotating frame 42 is tooth-shaped and can be rotated upward on the support frame 41. A tooth groove 43 is opened on the support frame 41, and the rotating frame 42 and the tooth groove 43 are meshed with each other.

[0034] When the movable hood 32 rises, the flap 4 follows the movable hood 32 to rise and then pushes the reflux liquid at the bottom of the tower plate 1 to move upward. In the process of gas-liquid phase exchange, the reflux liquid at the bottom of the tower plate 1 may be fully exchanged with the gas, resulting in saturation. It is difficult for the reflux liquid to carry away the saturated reflux liquid at the bottom during its flow. The reflux liquid at the bottom is pushed upward by the upward movement of the flap 4, so that the saturated reflux liquid flows away. When the flap 4 moves upward, the rotating frame 42 and the supporting frame 41 are in a plate shape; when the movable hood 32 descends, due to the instantaneous decompression of the enclosed space, the elastic member 34 pulls the movable hood 32 downward, and under the action of the resistance of the liquid flow, the rotating frame 42 rotates on the supporting frame 41. The gas leaked from the enclosed space is divided into small bubbles when passing through the supporting frame 41 and the rotating frame 42. When the small bubbles exchange gas-liquid phases with the reflux liquid, the contact area is larger, the mixing is more uniform, and the efficiency is higher.

[0035] A protrusion 45 for contacting the rotating frame 42 is fixed in the tooth groove 43, and a groove 46 cooperating with the protrusion 45 is formed on the lower end surface of the rotating frame 42; when the flap 4 rises, the protrusion 45 and the groove 46 abut against each other, and the rotating frame 42 is in the tooth groove 43 of the support frame 41, and when the reflux liquid is pushed upward, the turbulence effect on the reflux liquid is better; in other embodiments of the present invention, the flap 4 may only include the support frame 41, and the gas can also be cut into small bubbles when escaping from the confined space, but the turbulence effect on the reflux liquid when the support frame 41 pushes the reflux liquid upward is not good.

[0036] A guide groove 7 for accommodating the end of the movable cover 32 is provided on the tower plate 1, and the width of the guide groove 7 is greater than the wall thickness of the movable cover 32; the width of the guide groove 7 is greater than the width of the movable cover 32, and when the movable cover 32 descends, its end is located in the guide groove 7 on the tower plate 1, so that the reflux liquid in the guide groove 7 can be discharged in time.

[0037] The air inlet pipe 5 extends into the fixed sleeve 31, and the top of the air inlet pipe 5 is higher than the height of the reflux liquid level. A one-way valve 6 is provided in the air inlet pipe 5; when the gas enters the fixed sleeve 31, downward pressure is applied to the reflux liquid level. By providing the one-way valve 6, the gas can only flow toward the reflux liquid through the bubble mechanism 3.

[0038] The specific working principle of the present invention is:

[0039] Gas is introduced into the bubble mechanism 3 through the air inlet pipe 5, and the movable cover 32 moves upward and stretches the elastic member 34. After the elastic member 34 is stretched to a certain length, the gas pressure in the bubble mechanism 3 increases and presses down the liquid level of the reflux liquid in the bubble mechanism 3 until the liquid level drops below the air permeable hole 33. At this time, the pressure in the bubble mechanism 3 is instantly reduced. Under the action of the spring tension, the movable cover 32 is lowered, the liquid level in the bubble mechanism 3 rises, and the gas escaping from the bubble mechanism 3 rises and contacts the reflux liquid. In the above process, the gas is first stored in the bubble mechanism 3 and then contacts the reflux liquid. The contact time between the gas phase and the liquid phase is longer, and the distillation effect is better; in the process of the movable cover 32 moving upward, the flap 4 is driven to rise, and the saturated liquid phase at the bottom of the reflux liquid is pushed upward and flows away with the reflux liquid. At the same time, when the movable cover 32 is descending, the rotating frame 42 is rotated on the support frame 41. When the bubble rises and passes through the support frame 41, it is divided into a plurality of small bubbles, so that the contact area between the gas phase and the liquid phase is larger, and the distillation effect is better.

[0040] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A distillation tower for producing sustainable aviation fuel, comprising a tower body and a tower plate (1), wherein an overflow weir (2) is provided on the tower plate (1), the tower plate (1), the tower body, and the overflow weir (2) form a receiving tank for receiving reflux liquid, and a plurality of bubble cap mechanisms (3) are provided on the tower plate (1), characterized in that: The bubble cap mechanism (3) comprises a fixed sleeve (31) and a movable cover (32); the fixed sleeve (31) is open at the top and fixed on the tower plate (1); the movable cover (32) is closed at the top and open at the bottom and is sealed and slidably assembled in the fixed sleeve (31) in the up-down direction; an elastic member (34) for pulling the movable cover (32) downward is provided between the movable cover (32) and the fixed sleeve (31); an air inlet pipe (5) extending into the movable cover (32) is provided on the tower plate (1); a vent hole (33) is provided on the side wall of the fixed sleeve (31); the vent hole (33) is communicated with the inside of the movable cover (32); the top of the overflow weir (2) is higher than the vent hole (33) so that reflux liquid can enter the fixed sleeve (31); A flap (4) is fixedly mounted on the outside of the movable cover (32), the flap (4) being located in the accommodating groove, the flap (4) being slidably sleeved on the outside of the fixed cover (31) in the up-down direction, a connecting rod (44) being provided between the flap (4) and the movable cover (32), the flap (4) comprising a support frame (41) and a rotating frame (42), the support frame (41) being connected to the connecting rod (44), the rotating frame (42) being tooth-shaped and being rotatably arranged on the support frame (41) in an upwardly flippable manner, the support frame (41) being provided with a tooth groove (43), the rotating frame (42) and the tooth groove (43) being meshed with each other; The air inlet pipe (5) allows gas to enter the fixed sleeve (31) to push the movable cover (32) upward and press the reflux liquid in the fixed sleeve (31) into the receiving groove through the air vent (33); when the liquid level in the fixed sleeve (31) drops to the air vent (33), the gas is ejected from the air vent (33), and the elastic member (34) pulls the movable cover (32) downward to reset it and moves the flap (4) to below the air vent (33).

2. A distillation tower for producing sustainable aviation fuel according to claim 1, characterized in that: A protrusion (45) for contacting the rotating frame (42) is fixed in the tooth groove (43), and a groove (46) matching with the protrusion (45) is formed on the lower end surface of the rotating frame (42).

3. A distillation tower for producing sustainable aviation fuel according to any one of claims 1-2, characterized in that: The elastic member (34) is a spring, one end of which is connected to the fixed sleeve (31), and the other end of which is connected to the movable cover (32).

4. A distillation tower for producing sustainable aviation fuel according to any one of claims 1-2, characterized in that: A plurality of the air holes (33) are evenly distributed along the circumference of the fixing sleeve (31), and the plurality of air holes (33) are arranged at intervals.

5. A distillation tower for producing sustainable aviation fuel according to claim 1, characterized in that: The tower plate (1) is provided with a guide groove (7) for accommodating the end of the movable cover (32), and the width of the guide groove (7) is greater than the wall thickness of the movable cover (32).

6. A distillation tower for producing sustainable aviation fuel according to any one of claims 1-2, characterized in that: A one-way valve (6) is arranged in the air intake pipe (5).

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