Heat pump coupling double-effect backflow low-consumption rectifying tower

Abstract

The invention relates to the technical field of rectifying towers, in particular to a heat pump coupling double-effect backflow low-consumption rectifying tower. Comprising a main tower, an auxiliary tower, a feeding pipe and a refining tower gas conveying pipe, the refining tower gas conveying pipe is arranged at the top of the main tower and communicated with the auxiliary tower through a compressor, reboilers are arranged at the bottoms of the main tower and the auxiliary tower, the auxiliary tower is connected with a liquid breaking mechanism located at the top in the main tower, the liquid breaking mechanism comprises a liquid breaking part and a liquid return pipe, and the liquid return pipe is communicated with the auxiliary tower. And reflux liquid at the bottom in the auxiliary tower is introduced into the top in the main tower by the liquid return pipe. A liquid phase in the auxiliary tower is introduced to be released from the top in the main tower, and the fan blades on the two sides are driven by the power of the reflux to scatter and throw out the reflux in a reverse rotation manner, so that the reflux is uniformly spread in the main tower in a liquid drop form, the contact area with a rising gas phase in the main tower is increased, and the gas phase in the main tower is uniformly dispersed. Light components in a liquid phase are promoted to diffuse into a gas phase, and the rectification separation effect is improved.

Description

Technical Field

[0001] This invention relates to the field of distillation column technology, and more specifically, to a low-consumption distillation column with heat pump coupled dual-effect reflux. Background Technology

[0002] In the chemical production field, distillation columns are key equipment for separating mixtures. From an energy utilization perspective, traditional distillation columns lack a robust heat recovery and reuse mechanism. During distillation, a large amount of heat-carrying gaseous phase is generated, and the thermal energy contained in these gaseous phases is not fully and effectively utilized.

[0003] For example, the high-temperature gas phase discharged from the top of the column loses its heat directly into the environment, which not only wastes energy but also requires a large amount of additional energy to maintain the temperature conditions required for the distillation process, significantly increasing production costs.

[0004] In gasoline production, alkanes and alkenes with different carbon numbers can be effectively separated, improving the quality and purity of gasoline products. As production volume increases, measures are typically taken to ensure high separation efficiency, encouraging multiple contacts between the circulating reflux liquid (liquid phase) and the gas phase to enhance mass transfer and thus improve separation performance. For example, using fan blades to break the reflux liquid into fine droplets, increasing the gas-liquid contact area, is a common and effective method.

[0005] However, in actual operation, when the blades disperse the reflux liquid, the reflux liquid diffuses into a specific reaction chamber and accumulates there. Since the reaction chamber is an important channel for gas flow, when the gas flows through the reaction chamber and comes into contact with the reflux liquid that has accumulated there, it will lead to uneven distribution of the gas and liquid phases.

[0006] The accumulation of reflux liquid in the reaction chamber can lead to excessively thick local liquid layers, which hinders sufficient contact between the gas phase and the liquid droplets and reduces mass transfer efficiency. Furthermore, the concentrated contact between the gas and liquid phases in the reaction chamber reduces the opportunities for gas-liquid contact in other areas of the tower, making it impossible to achieve uniform contact over a wider range, thus limiting the improvement of the overall separation effect. Summary of the Invention

[0007] This invention provides a low-consumption distillation column with heat pump coupled dual-effect reflux. The reflux liquid is driven by its own power to rotate the two side blades in opposite directions, thus dispersing and ejecting the reflux liquid, thereby solving the problems mentioned in the background art. To achieve the above objectives, a low-consumption distillation column with heat pump coupled dual-effect reflux includes a main column, a secondary column, a feed pipe, and a distillation column gas delivery pipe. The distillation column gas delivery pipe is located at the top of the main column and is connected to the secondary column via a compressor. Both the main column and the secondary column are equipped with reboilers at their bottoms. The secondary column is connected to a liquid-breaking mechanism located at the top of the main column. The liquid-breaking mechanism includes a liquid-breaking section and a return pipe. The return pipe is connected to the secondary column and introduces the reflux liquid from the bottom of the secondary column to the top of the main column. The reflux liquid drives the liquid-breaking sections on both sides to disperse the reflux liquid into droplets distributed at the top of the main column through counter-rotation. The fine tower gas transmission pipe is used to introduce the top gas phase in the main tower into the secondary tower, and at the same time preheat the reflux liquid returning to the top of the main tower. The secondary tower is connected to the main tower by a fine tower return gas pipe that introduces the top gas phase in the secondary tower into the main tower, so as to cooperate with the gas phase in the main tower to break the gas film resistance on the surface of the droplets and promote the diffusion of light components from the liquid phase to the gas phase.

[0008] A heat collection cylinder is fixedly installed on the return pipe near the main tower, and a heat collection cavity is formed between the inner wall of the heat collection cylinder and the outer wall of the return pipe to receive the gas phase from the top of the main tower. Two sections of refined tower gas delivery pipes are connected to the heat collection cavity. One section of the refined tower gas delivery pipe is connected to the top of the main tower, and the connection point of this section of the refined tower gas delivery pipe with the heat collection cylinder is close to the main tower. The connection point of the other section of the refined tower gas delivery pipe with the heat collection cylinder is far away from the main tower, so as to prolong the residence time of the gas phase in the heat collection cavity.

[0009] The liquid separation section includes a fan blade rotatably mounted at the bottom of the liquid separation block and a water-blocking plate coaxially connected to the fan blade. The fan blade is eccentrically mounted inside the main tower. The top of the fan blade is coaxially connected to a rotating shaft that passes through the liquid separation block. An outlet hole and an arc-shaped cavity for accommodating the water-blocking plate are provided inside the liquid separation block. The arc-shaped cavity is connected to the outlet hole, and the width of the outlet hole is smaller than that of the water-blocking plate.

[0010] One side of the arc-shaped cavity is a flat-mouthed drain outlet, which is close to the fan blade shaft in the horizontal direction. When the reflux liquid drives the water baffle plate to rotate, the fan blades on both sides release the reflux liquid through the counter-rotation to disperse it, so that the reflux liquid droplets are distributed throughout the main tower.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this low-consumption distillation column with heat pump coupled dual-effect reflux, the liquid phase in the auxiliary column is introduced into the main column and released from the top. The reflux liquid is driven by its own power to disperse and throw out the reflux liquid by the fan blades on both sides rotating in opposite directions. This makes the reflux liquid evenly distributed in the main column in the form of droplets, which increases the contact area with the rising gas phase in the main column, promotes the diffusion of light components in the liquid phase into the gas phase, and improves the distillation separation effect.

[0012] 2. In this low-consumption distillation column with heat pump coupling and double-effect reflux, the gas phase is introduced into the heat collection chamber and exchanges heat with the outer wall of the return liquid pipe. The gas phase transfers heat to the reflux liquid in the return liquid pipe to achieve heating and heat preservation. The gas phase after heat exchange is transported to the compressor through the distillation column gas pipeline. After compression, the pressure and temperature increase, and then it is transported to the auxiliary column for utilization, thereby improving the energy utilization efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the main tower of the present invention (cut cross-section). Figure 3 This is a schematic diagram of the connection structure between the return pipe and the pump body of the present invention; Figure 4 This is a schematic diagram of the reflux liquid and gas phase flow of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the diagram; Figure 6 This is a cross-sectional schematic diagram of the internal structure of the gas collecting shell of the present invention; Figure 7 This is a schematic diagram showing the positions of the air inlet and air outlet of the present invention; Figure 8 This is a schematic diagram illustrating the gas-phase compression principle inside the gas collecting shell of the present invention; Figure 9 This is a schematic diagram of the fan blades dispersing the reflux liquid according to the present invention.

[0014] The meanings of the labels in the diagram are as follows: 100. Main tower; 101. Secondary tower; 102. Feed pipe; 103. Refining tower gas transmission pipe; 104. Compressor; 105. Reboiler; 106. Refining tower return gas pipe; 110. Gas collecting shell; 111. Gas return duct; 112. Air inlet; 113. Air outlet; 120. Liquid separator; 121. Vent pipe; 122. Cover; 123. Support rod; 130. Rotating wheel; 131. Air baffle; 132. Spring; 200. Liquid fragmentation mechanism; 210. Liquid return pipe; 211. Heat collection cylinder; 212. Heat collection chamber; 213. Liquid distribution block; 214. Liquid outlet; 215. Pump body; 220. Fan blade; 221. Water baffle. Detailed Implementation

[0015] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0016] To address the issue of insufficient gas-liquid phase contact, this invention presents a low-consumption distillation column with heat pump coupled dual-effect reflux, referencing... Figures 1-2 As shown, the device includes a main tower 100, a secondary tower 101, a feed pipe 102, and a refiner gas delivery pipe 103. The refiner gas delivery pipe 103 is located at the top of the main tower 100 and is connected to the secondary tower 101 via a compressor 104. Both the main tower 100 and the secondary tower 101 are equipped with reboilers 105 at their bottoms. The gas phase flow path of this device is divided into two paths. Path one: The gas phase at the top of the main tower 100 is transported to the secondary tower 101 via a1-a2-a3. During this process, the gas phase at the top of the main tower 100 has a certain amount of heat. Transporting it to the secondary tower 101 allows this heat to be utilized in the secondary tower 101, reducing the energy requirement for additional heating. This realizes heat recovery and reuse within the device, improves overall energy efficiency, and reduces energy consumption and production costs. Path 2: The gas phase inside the secondary tower 101 flows back to the interior of the main tower 100 via b1-b2-b3; these are the two paths for gas phase flow.

[0017] Secondly, based on Figure 2 Based on and then combined Figure 3 , Figure 4 As shown, the secondary tower 101 is connected to a liquid fragmentation mechanism 200 located at the top of the main tower 100. The liquid fragmentation mechanism 200 includes a liquid fragmentation section and a return pipe 210. The return pipe 210 is connected to the secondary tower 101. The return pipe 210 introduces the reflux liquid from the bottom of the secondary tower 101 to the top of the main tower 100. With the help of the reflux liquid, the liquid fragmentation sections on both sides are driven to break the reflux liquid into droplets and distribute them at the top of the main tower 100 through counter-rotation, thereby increasing the gas-liquid contact area. The distillation column gas transmission pipe 103 is used to introduce the top gas phase in the main column 100 into the auxiliary column 101, and at the same time preheat the reflux liquid returning to the top of the main column 100. The auxiliary column 101 is connected to the main column 100 by a distillation column return gas pipe 106, which introduces the top gas phase in the auxiliary column 101 into the main column 100, so as to cooperate with the gas phase in the main column 100 to break the gas film resistance on the surface of the liquid droplets, promote the diffusion of light components from the liquid phase to the gas phase, and improve the distillation effect.

[0018] First, the return pipe 210 connects the secondary tower 101 to the main tower 100. A pump body 215 is connected between the return pipe 210 and the secondary tower 101, and one end of the return pipe 210 extends into the main tower 100. In this way, the liquid phase in the secondary tower 101 is introduced into the main tower 100 through the pump body 215 and the return pipe 210, and the reflux liquid is discharged from the top of the main tower 100. After being discharged from the top of the main tower 100, the reflux liquid flows downward and forms a countercurrent contact with the gas phase flowing from bottom to top. This allows the gas and liquid phases to come into contact multiple times in the main tower 100, increasing the opportunity for light components to be transferred from the liquid phase to the gas phase, thereby improving the mass transfer efficiency and separation effect. Because the return pipe 210 transports the reflux liquid to the main tower 100 over a distance, heat loss occurs during this long-distance transport, causing the reflux liquid to cool and affecting the separation effect. Therefore, to maintain the temperature of the reflux liquid supplied to the main tower 100, a heat collection cylinder 211 is fixedly installed on the return pipe 210 near the main tower 100. A heat collection chamber 212 is formed between the inner wall of the heat collection cylinder 211 and the outer wall of the return pipe 210 to receive the gas phase from the top of the main tower 100. When the gas phase is introduced, two sections of fine tower gas delivery pipe 103 are connected to the heat collection cavity 212. One section of fine tower gas delivery pipe 103 is connected to the top of the main tower 100, and the connection point of this section of fine tower gas delivery pipe 103 with the heat collection cylinder 211 is close to the main tower 100, which facilitates the rapid introduction of the gas phase from the top of the main tower 100 into the heat collection cavity 212. The connection point of the other section of fine tower gas delivery pipe 103 with the heat collection cylinder 211 is far away from the main tower 100, thereby prolonging the residence time of the gas phase in the heat collection cavity 212.

[0019] That is, when the gas phase enters the heat collection chamber 212, it exchanges heat with the outer wall of the return liquid pipe 210. Since the gas phase discharged from the main tower 100 has a certain amount of heat, it can transfer the heat to the return liquid in the return liquid pipe 210, thereby heating and keeping the return liquid warm. This prolongs the residence time of the gas phase in the heat collection chamber 212, making the heat exchange more complete and further improving the heat preservation effect.

[0020] Then, the gas phase after heat exchange is transported to the compressor 104 via the refinement tower gas delivery pipe 103. After being compressed by the compressor 104, the pressure and temperature of the gas phase will increase significantly and it will be transported to the auxiliary tower 101 for utilization. That is, by introducing the gas phase into the heat collection chamber 212 and exchanging heat with the outer wall of the return liquid pipe 210, the gas phase transfers heat to the reflux liquid in the return liquid pipe 210, realizing heating and heat preservation. After heat exchange, the gas phase is transported to the compressor 104 via the refinement tower gas delivery pipe 103. After being compressed, its pressure and temperature increase, and it is then transported to the auxiliary tower 101 for utilization, thereby improving energy utilization efficiency.

[0021] Furthermore, several liquid baffles 120 are fixedly installed inside the main column 100 from top to bottom. The liquid baffles 120 divide the interior of the main column 100 into an "S"-shaped path for the reflux liquid to flow through. This prolongs the residence time of the reflux liquid in the column, allowing it to have more sufficient contact and mass transfer with the gas phase, thereby improving the distillation separation effect. refer to Figure 5 As shown, the liquid separator 120 has several air holes, and each air hole is provided with a corresponding air outlet pipe 121. The top of the air outlet pipe 121 is higher than the upper edge of the liquid separator 120. The liquid separator 120 is covered with a cover 122. The inner diameter of the cover 122 is larger than the outer diameter of the air outlet pipe 121. The lower edge of the cover 122 is higher than the upper edge of the liquid separator 120. There is a height difference between the lower edges of the two. An airflow channel for gas phase circulation is formed between the inner wall of the cover 122 and the air outlet pipe 121. This airflow channel is used to introduce the gas phase to blow towards the liquid phase accumulated on the liquid separator 120. The cover 122 and the air outlet pipe 121 are fixedly provided with a support rod 123. When the gas phase passes through the gas flow channel, it impacts the liquid phase at a certain speed. On the one hand, this breaks the gas film on the surface of the liquid phase, reduces diffusion resistance, and makes it easier for light components to diffuse from the liquid phase into the gas phase. On the other hand, the disturbance effect of the gas flow also increases the flow of the liquid phase, promotes mixing inside the liquid phase, and is beneficial for gas-liquid separation.

[0022] It should be noted that the bottom of the support rod 123 is preferably in the shape of an "I" or a "+", which can reduce the impact on the rise of the gas phase in the outlet pipe 121 and ensure the gas phase flow speed.

[0023] also, Figure 6 , Figure 7 , Figure 8 The specific structure of the gas collecting shell 110 is shown. The gas collecting shell 110 is connected between the return gas pipe 106 of the refinement tower and the main tower 100. The gas collecting shell 110 is divided into an inlet chamber and a supply chamber by a partition. The inlet chamber and the supply chamber are connected by an inlet hole 112 on the partition, so that gas can be transferred from the inlet chamber to the supply chamber. In addition, the gas collecting shell 110 has an outlet hole 113 connected to the supply chamber. The outlet hole 113 is connected to the main tower 100 by a return gas conduit 111. In this way, the gas phase in the auxiliary tower 101 can be transported to the main tower 100 through the gas collecting shell 110 and the return gas conduit 111. It is also worth noting that the diameter of the air inlet 112 is larger than that of the air outlet 113, and a rotating wheel 130 is eccentrically mounted inside the air supply chamber. The partial arc edge of the rotating wheel 130 is close to the inner wall of the air supply chamber. Figure 8 As shown, the rotating wheel 130 has several air baffles 131 and springs 132 inside. One end of the air baffle 131 is located in a groove inside the rotating wheel 130. The end of each air baffle 131 slides against the inner wall of the air supply chamber, forming a compression chamber between two adjacent air baffles 131.

[0024] In this way, by pressurizing the gas phase that flows back into the main tower 100, and then combining it with the upward flow of the original gas phase in the main tower 100 to form a countercurrent flow with the downward flow of the liquid phase, it is beneficial for the light components to be separated more thoroughly from the liquid phase and enter the gas phase, thereby improving the purity of the product.

[0025] Return to Figure 4 and combined Figure 9 As shown, a liquid distribution block 213 is fixedly connected to the end of the return pipe 210 located inside the main tower 100. The interior of the liquid distribution block 213 is connected to the return pipe 210, so that the return liquid can smoothly enter the liquid distribution block 213 from the return pipe 210. The liquid fragmentation section at the bottom of the liquid distribution block 213 is symmetrically distributed. The liquid fragmentation section includes a fan blade 220 rotatably disposed at the bottom of the liquid distribution block 213 and a water-blocking plate 221 coaxially connected to the fan blade 220. The fan blade 220 is eccentrically disposed inside the main tower 100, and a water-blocking plate 221 is coaxially connected to the top of the fan blade 220. The rotating shaft through the liquid block 213 has an outlet hole 214 and an arc-shaped cavity for accommodating the water-blocking plate 221. The arc-shaped cavity is connected to the outlet hole 214, and the width of the outlet hole 214 is smaller than that of the water-blocking plate 221. When the return liquid flows into the liquid block 213 through the return pipe 210, the return liquid is divided into two streams and flows out from the outlet hole 214 respectively. The return liquid flowing out from the outlet hole 214 drives the water-blocking plate 221 to rotate. The rotation directions of the two water-blocking plates 221 and the corresponding fan blades 220 are opposite. Furthermore, one side of the arc-shaped cavity has a flat-mouthed drain outlet, which is located horizontally close to the rotating shaft of the fan blade 220. When the reflux liquid drives the water-blocking plate 221 to rotate, the fan blades 220 on both sides disperse the reflux liquid released from the drain outlet by rotating in opposite directions, so that the reflux liquid droplets are distributed throughout the main tower 100. During the reverse rotation of the fan blades 220, the reflux liquid released from the drain outlet is subjected to shearing and centrifugal forces generated by the rotation of the fan blades 220. The shearing force cuts the discharged reflux liquid into fine liquid streams, while the centrifugal force further disperses these liquid streams into tiny droplets. As the fan blades 220 continue to rotate, the droplets are continuously thrown out, thus distributing them throughout various areas of the main tower 100. Then, the gas phase rises, increasing the contact area between the reflux liquid and the rising gas phase inside the tower, allowing the gas and liquid phases to transfer mass and heat more fully, thus improving the separation effect and product quality within the main tower 100.

[0026] In summary, by introducing the liquid phase from the secondary column 101 and releasing it from the top of the main column 100, the reflux liquid is dispersed and thrown out by the counter-rotating fan blades 220 driven by its own power. This causes the reflux liquid to be evenly distributed in the form of droplets within the main column 100, increasing the contact area with the rising gas phase within the main column 100. This promotes the diffusion of light components in the liquid phase into the gas phase, thereby improving the distillation separation effect.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-consumption distillation column with heat pump coupled double-effect reflux, comprising a main column (100), a secondary column (101), a feed pipe (102), and a distillation column gas delivery pipe (103), wherein the distillation column gas delivery pipe (103) is located at the top of the main column (100) and is connected to the secondary column (101) via a compressor (104), and both the main column (100) and the secondary column (101) are provided with reboilers (105) at the bottom, characterized in that: The secondary tower (101) is connected to a liquid breaking mechanism (200) located at the top of the main tower (100). The liquid breaking mechanism (200) includes a liquid breaking section and a return pipe (210), and the return pipe (210) is connected to the secondary tower (101). The secondary tower (101) is connected to the main tower (100) by a gas return pipe (106) that introduces the top gas phase in the secondary tower (101) into the main tower (100). A liquid distribution block (213) is fixedly connected to the end of the return pipe (210) located in the main tower (100). The interior of the liquid distribution block (213) is connected to the return pipe (210), and the broken liquid parts at the bottom of the liquid distribution block (213) are symmetrically distributed. The liquid breaking section includes a fan blade (220) rotatably disposed at the bottom of the liquid separating block (213) and a water blocking plate (221) coaxially connected to the fan blade (220). The fan blade (220) is eccentrically disposed inside the main tower (100). The top of the fan blade (220) is coaxially connected to a rotating shaft that passes through the liquid separating block (213). An outlet hole (214) and an arc-shaped cavity for accommodating the water blocking plate (221) are provided inside the liquid separating block (213). The arc-shaped cavity is connected to the outlet hole (214). The width of the outlet hole (214) is smaller than that of the water blocking plate (221).

2. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 1, characterized in that: A heat collection cylinder (211) is fixedly installed on the return pipe (210) near the main tower (100). A heat collection cavity (212) is formed between the inner wall of the heat collection cylinder (211) and the outer wall of the return pipe (210) to receive the gas phase from the top of the main tower (100). Two sections of refined tower gas delivery pipe (103) are connected to the heat collection cavity (212). One section of the refined tower gas delivery pipe (103) is connected to the top of the main tower (100). The connection between this section of the refined tower gas delivery pipe (103) and the heat collection cylinder (211) is close to the main tower (100), while the connection between the other end of the refined tower gas delivery pipe (103) and the heat collection cylinder (211) is far away from the main tower (100), so as to prolong the residence time of the gas phase in the heat collection cavity (212).

3. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 1, characterized in that: The return pipe (210) connects the secondary tower (101) and the main tower (100). A pump body (215) is connected between the return pipe (210) and the secondary tower (101), and one end of the return pipe (210) extends into the main tower (100).

4. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 3, characterized in that: Several liquid baffles (120) are fixedly installed inside the main tower (100) from top to bottom. The liquid baffles (120) divide the interior of the main tower (100) into an "S"-shaped path through which the reflux liquid flows.

5. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 4, characterized in that: The liquid separator (120) has several air holes, and each air hole is provided with an air outlet pipe (121). The top of the air outlet pipe (121) is higher than the upper edge of the liquid separator (120). The liquid separator (120) is covered with a cover (122). The inner diameter of the cover (122) is larger than the outer diameter of the air outlet pipe (121), and the lower edge of the cover (122) is higher than the upper edge of the liquid separator (120). An airflow channel for gas phase circulation is formed between the inner wall of the cover (122) and the air outlet pipe (121). The airflow channel is used to introduce the gas phase to blow towards the liquid phase accumulated on the liquid separator (120). The cover (122) and the air outlet pipe (121) are fixedly provided with a support rod (123).

6. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 1, characterized in that: One side of the arc-shaped cavity is a flat-mouthed drain port. The drain port is close to the rotating shaft of the fan blade (220) in the horizontal direction. When the reflux liquid drives the water blocking plate (221) to rotate, the fan blades (220) on both sides release the reflux liquid through the reverse rotation to disperse the reflux liquid, so that the reflux liquid droplets are distributed throughout the main tower (100).

7. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 1, characterized in that: A gas collecting shell (110) is connected between the fine tower return gas pipe (106) and the main tower (100). The gas collecting shell (110) is divided into an air inlet chamber and an air supply chamber by a partition. The air inlet chamber and the air supply chamber are connected by an air inlet hole (112) on the partition. The gas collecting shell (110) has an air outlet hole (113) that is connected to the air supply chamber. The air outlet hole (113) is connected to the main tower (100) by a return gas pipe (111).

8. The low-consumption distillation column with heat pump coupled double-effect reflux according to claim 7, characterized in that: The diameter of the air inlet (112) is larger than that of the air outlet (113). A rotating wheel (130) is eccentrically mounted inside the air supply chamber. The rotating wheel (130) has several air baffles (131) and springs (132) inside. The end of each air baffle (131) slides against the inner wall of the air supply chamber, forming a compression chamber between two adjacent air baffles (131).

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