A distillation tower tail gas ethanol condensation recovery system and condensation process thereof

Abstract

The present invention belongs to the technical field of condensation equipment, and in particular relates to a distillation tower tail gas ethanol condensation recovery system, comprising a condensation box, a condensation chamber is arranged in the condensation box, and the inner wall of the condensation chamber is provided with an air inlet, an air outlet and a liquid outlet; a condensation tube is installed in the condensation chamber, and a first cold medium circulates inside; a plurality of secondary condensation chambers are also arranged in the condensation box, and are all located on the side of the condensation chamber; an extension tube is connected in series on the condensation tube, and the extension tube extends into the secondary condensation chamber; wherein the secondary condensation chamber is filled with a second cold medium; by setting the secondary condensation chamber, and connecting the extension tube extending into the secondary condensation chamber in series on the condensation tube, so that during the condensation process, the temperature of the first cold medium in the condensation tube that is increased due to heat transfer is continuously reduced by the second cold medium, the downward trend of the temperature difference between the first cold medium and the tail gas is reduced, the condensation effect is ensured, and the ethanol recovery effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of condensation equipment, and in particular relates to a distillation tower tail gas ethanol condensation recovery system and a condensation process thereof. Background Art

[0002] Distillation is a thermodynamic separation process that utilizes the different boiling points of components in a mixed liquid or liquid-solid system to evaporate the low-boiling-point component and then condense it to separate the entire component. It is a unit operation process that combines the two unit operations of evaporation and condensation. Compared with other separation methods, such as extraction, filtration and crystallization, it has the advantage of not requiring the use of solvents other than the system components, thereby ensuring that no new impurities are introduced.

[0003] The current alcohol four-differential pressure distillation production process technology includes a crude tower, a rectifying tower (rectifying tower), an aldehyde removal tower (aldehyde tower) and a methanol tower (Tower A). In order to remove impurities such as aldehydes, alcohols, acids and the like in the product, the temperature of the final condenser of the aldehyde tower, the temperature of the final condenser of the rectifying tower, and the impurity removal temperature of the final cooler of Tower A are required to be 55-70°C; since the exhaust gas discharged from the final condensers of each tower has a high temperature, the amount of high-concentration alcohol (95.0%) carried by the exhaust gas volatilizing into the air is also very large, and directly discharged into the atmosphere will cause economic losses and air pollution.

[0004] For example, Chinese patent application number (CN202221364520.7) discloses an ethanol recovery device for tail gas from each distillation tower in a distillation section, including a primary mixing tank and a cooler. The cooler includes a vertically arranged shell, the interior of the shell is divided by a vertical partition to form a left chamber and a right chamber, the left chamber and the right chamber are respectively provided with heat exchange tubes, the heat exchange tubes are interconnected at one end, a cold fluid inlet and a cold fluid outlet are respectively provided on the shell to be connected to the heat exchange tubes to form a cooling path; a gas inlet and a gas outlet are respectively provided on the shell, a plurality of through holes are provided at the bottom of the partition to connect the left chamber and the right chamber, the primary mixed gas passes through the left chamber and the right chamber and is discharged from the gas outlet to form an exhaust gas path; an alcohol discharge port is provided at the bottom of the shell, and the heat exchange tube of this application is that after the exhaust gas contacts the heat exchange, the temperature difference between the heat exchange tube and the exhaust gas decreases significantly with the heat transfer time, which is not conducive to the condensation of the exhaust gas, thereby affecting the recovery effect of ethanol, and needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a distillation tower tail gas ethanol condensation recovery system and a condensation process thereof in order to solve the above-mentioned technical problems, so as to slow down the downward trend of the temperature difference between the cold medium and the tail gas during the condensation process, ensure the condensation effect, and prevent it from affecting the ethanol recovery effect.

[0006] In view of this, the present invention provides a distillation tower tail gas ethanol condensation recovery system, comprising:

[0007] A condensation box body, wherein a condensation chamber is provided in the condensation box body, and an air inlet, an air outlet and a liquid outlet are provided on the inner wall of the condensation chamber;

[0008] A condenser tube, which is installed in the condenser chamber and has a first cooling medium flowing therein;

[0009] Secondary condensation chamber, there are multiple secondary condensation chambers, which are opened in the condensation box and are all located on the side of the condensation chamber;

[0010] An extension pipe, which is connected in series to the condenser pipe and extends into the secondary condenser chamber;

[0011] The secondary condensation chamber is filled with a second cold medium.

[0012] In the present technical solution, a secondary condensation chamber is provided, and an extension tube extending into the secondary condensation chamber is connected in series to the condensation tube. Thus, during the condensation process, the temperature of the first cold medium in the condensation tube that is increased due to heat transfer is continuously reduced by the second cold medium, thereby reducing the downward trend of the temperature difference between the first cold medium and the exhaust gas, thereby ensuring the condensation effect and improving the recovery effect of ethanol.

[0013] In the above technical solution, further, the extension tube includes:

[0014] A connecting section, the connecting section extending away from a side of the condensing tube to the secondary condensing chamber;

[0015] The serpentine section is located in the secondary condensation chamber;

[0016] The extension tube is U-shaped and has two connecting sections.

[0017] In the present technical solution, by setting the extension tube into a U shape, it is convenient for the first cold medium to return to the condenser tube after heat transfer and cooling in the secondary condensation chamber, and the serpentine section can increase the residence time of the first cold medium in the secondary condensation chamber while ensuring that the flow rate of the first cold medium remains unchanged, thereby ensuring that the temperature of the first cold medium increased by heat transfer is effectively reduced, reducing the downward trend of the temperature difference between the first cold medium and the exhaust gas, and ensuring the condensation effect.

[0018] In the above technical solution, further, it also includes:

[0019] A partition, which is installed on the inner wall of the condensation chamber and is located between two connecting sections of the same extension tube and is arranged parallel to the connecting section;

[0020] Wherein, the partitions on both sides of the inner wall of the condensation chamber are alternately distributed.

[0021] In the present technical solution, by setting up partitions, and alternatingly distributing the partitions on both sides of the inner wall of the condensation chamber, the residence time of the exhaust gas in the condensation chamber is prolonged, thereby improving the condensation effect of the exhaust gas, and the partitions are arranged in parallel with the connecting section to facilitate the installation of the extension pipe and the partitions.

[0022] In the above technical solution, further, it also includes:

[0023] The water leakage hole is arranged on one side of the inner wall of the partition close to the condensation chamber.

[0024] In the technical solution, a water leakage hole is provided to facilitate the condensed liquid deposited on the partition and between the condensation chamber inner wall gap to fall, thereby avoiding deposition.

[0025] In the above technical solution, further, it also includes:

[0026] A connecting pipe, which is installed in the condensing box and is used to connect two adjacent secondary condensing chambers;

[0027] A cold medium inlet is provided on the secondary condensation chamber located on the side of the condensation chamber close to the air inlet, and a cold medium outlet is provided on the secondary condensation chamber located on the side of the condensation chamber close to the air outlet.

[0028] In the technical solution, by providing a connecting pipe and through the cold medium outlet and the cold medium outlet, it is convenient to circulate the second cold medium in the secondary condensation chamber, which helps to dissipate heat.

[0029] In the above technical solution, further:

[0030] A plurality of condensing tubes located on the two side walls of the condensing chamber are alternately distributed.

[0031] In the present technical solution, multiple condensing tubes are alternately distributed to provide a larger gas phase channel, thereby ensuring smooth flow of exhaust gas and condensation efficiency.

[0032] In the above technical solution, further, it also includes:

[0033] The heat insulation layer is located between the condensation chamber and the secondary condensation chamber.

[0034] In the technical solution, a heat insulating layer is provided to prevent the high temperature of the exhaust gas from affecting the second cold medium in the secondary condensation chamber, thereby affecting the cooling effect on the first cold medium.

[0035] In the above technical solution, further, it also includes:

[0036] A spoiler device, the spoiler device is installed on the inner wall of the secondary condensation chamber;

[0037] The spoiler device includes:

[0038] A spoiler disk, which is installed on the inner wall of the secondary condensation chamber and has spoiler protrusions on its circumference;

[0039] The driving motor is installed on the surface of the condensing box and is used to drive the spoiler to rotate.

[0040] In the present technical solution, a spoiler device is provided to facilitate the second cold medium in the secondary condensation chamber to generate a larger flow, thereby improving the cooling effect of the second cold medium on the first cold medium. The spoiler plate and the drive motor are used, which have a simple structure and occupy a small space, and are convenient for the installation and arrangement of multiple extension tubes.

[0041] In the above technical solution, further, it also includes:

[0042] An embedding groove is provided on the inner wall of the secondary condensation chamber;

[0043] A thread protrusion, which is arranged on a side of the spoiler away from the axis;

[0044] Wherein, a surface of the threaded protrusion away from the spoiler disc is in clearance fit with the inner wall of the embedding groove.

[0045] In the present technical solution, by providing an embedding groove and a threaded protrusion on the side of the spoiler away from the axis, when the spoiler rotates, the second cold medium entering between the embedding groove and the spoiler is pushed outward, thereby preventing the second cold medium from further overflowing the gap between the embedding groove and the spoiler, thereby improving the sealing effect.

[0046] In the above technical solution, further, the condensation process includes the following steps:

[0047] S1: The tail gas generated by each distillation tower is introduced into the transfer tank, and then enters the condensation chamber from the air inlet;

[0048] S2: The first cooling medium in the condenser tube contacts and transfers heat with the exhaust gas through the condenser tube;

[0049] S3: The first cold medium flowing in the condenser tube enters the extension tube and then enters the secondary condenser chamber;

[0050] S4: The first cold medium in the extension tube contacts and transfers heat with the second cold medium in the secondary condensation chamber through the extension tube;

[0051] S5: the first cooling medium flowing in the extension tube enters the condensing tube and then the condensing chamber, and continues to contact and transfer heat with the exhaust gas;

[0052] S6: Repeat S3-S6.

[0053] In this technical solution, the first cold medium after heat transfer in contact with the tail gas is continuously reduced by the second cold medium, thereby reducing the downward trend of the temperature difference between the first cold medium and the tail gas, ensuring the condensation effect and improving the recovery effect of ethanol.

[0054] The beneficial effects of the present invention are:

[0055] 1. Through the setting of the secondary condensation chamber, the second cold medium continuously lowers the temperature of the first cold medium after heat transfer with the tail gas, reduces the downward trend of the temperature difference between the first cold medium and the tail gas, ensures the condensation effect, and improves the recovery effect of ethanol;

[0056] 2. The serpentine tube is used to increase the time that the first cold medium stays in the second cold medium, thereby improving the cooling effect on the first cold medium. The flow-turbulating device, the connecting pipe, and the cold medium inlet and outlet can further improve the cooling effect of the second cold medium on the first cold medium.

[0057] 3. The residence time of the exhaust gas in the condensation chamber is increased by the partition, thereby improving the heat transfer effect between the exhaust gas and the first cold medium, thereby improving the condensation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the structure of the present invention;

[0059] Figure 2 is a side view of the present invention;

[0060] Figure 3 The present invention Figure 2 Sectional view at AA in the middle;

[0061] Figure 4 The present invention Figure 3 Enlarged view of point C in the middle;

[0062] Figure 5 The present invention Figure 2 Sectional view at the middle BB;

[0063] Figure 6 The present invention Figure 5 The enlarged view of point D in the middle;

[0064] The markings in the figure are as follows: 1. condensation box; 2. condensation chamber; 3. air inlet; 4. air outlet; 5. liquid outlet; 6. condensation tube; 7. secondary condensation chamber; 8. extension tube; 80. connecting section; 81. serpentine section; 9. partition; 10. leakage hole; 11. connecting pipe; 12. cold medium inlet; 13. cold medium outlet; 14. thermal insulation layer; 15. spoiler; 150. spoiler disk; 151. spoiler protrusion; 152. drive motor; 16. embedding groove; 17. threaded protrusion. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0066] Embodiment 1:

[0067] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, comprising:

[0068] A condensation box 1 is provided with a condensation chamber 2, and an inner wall of the condensation chamber 2 is provided with an air inlet 3, an air outlet 4 and a liquid outlet 5;

[0069] A condenser 6, which is installed in the condenser chamber 2 and has a first cooling medium flowing therein;

[0070] A secondary condensation chamber 7, which is multiple and is opened in the condensation box 1 and is located on the side of the condensation chamber 2;

[0071] An extension tube 8, which is connected in series to the condensation tube 6 and extends into the secondary condensation chamber 7;

[0072] Among them, the secondary condensation chamber 7 is filled with a second cold medium, and the first cold medium and the second cold medium are preferably cooling water, and the condensation tube 6 and the extension tube 8 are preferably welded, the condensation chamber 2 is preferably U-shaped, and the air inlet 3 and the air outlet 4 are respectively located on the top surfaces at both ends of the condensation chamber 2, and the liquid outlet 5 is located on the bottom surface.

[0073] It can be seen from the present embodiment that by providing a secondary condensation chamber 7 and connecting an extension tube 8 extending into the secondary condensation chamber 7 in series to the condensation tube 6, during the condensation process, the temperature of the first cold medium in the condensation tube 6 which is increased due to heat transfer is continuously reduced by the second cold medium, thereby reducing the downward trend of the temperature difference between the first cold medium and the exhaust gas, thereby ensuring the condensation effect and improving the recovery effect of ethanol.

[0074] Embodiment 2:

[0075] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the extension pipe 8 includes:

[0076] A connecting section 80, the connecting section 80 extending from one side of the condensing tube 6 to the secondary condensing chamber 7;

[0077] The serpentine section 81 is located in the secondary condensation chamber 7;

[0078] The extension tube 8 is U-shaped, and has two connecting sections 80 .

[0079] It can be seen from the present embodiment that by setting the extension tube 8 into a U shape, it is convenient for the first cold medium to return to the condenser tube 6 after heat transfer and cooling in the secondary condensation chamber 7, and the serpentine section 81 can increase the residence time of the first cold medium in the secondary condensation chamber 7 while ensuring that the flow rate of the first cold medium remains unchanged, thereby ensuring that the temperature of the first cold medium increased by heat transfer is effectively reduced, reducing the downward trend of the temperature difference between the first cold medium and the exhaust gas, and ensuring the condensation effect.

[0080] Embodiment 3:

[0081] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0082] The partition 9 is installed on the inner wall of the condensation chamber 2 and is located between the two connecting sections 80 of the same extension tube 8 and is arranged parallel to the connecting section 80;

[0083] The partitions 9 on both sides of the inner wall of the condensation chamber 2 are alternately distributed, and the partitions 9 and the inner wall of the condensation chamber 2 are preferably fastened with bolts.

[0084] It can be seen from the present embodiment that by setting the partition 9 and the partitions 9 on both sides of the inner wall of the condensation chamber 2 being distributed alternately, the residence time of the exhaust gas in the condensation chamber 2 is prolonged, thereby improving the condensation effect of the exhaust gas, and the partition 9 is arranged parallel to the connecting section 80, which facilitates the installation of the extension pipe 8 and the partition 9.

[0085] Embodiment 4:

[0086] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0087] A water leakage hole 10, which is provided on one side of the inner wall of the partition plate 9 close to the condensation chamber 2;

[0088] Among them, the number of water leakage holes 10 is preferably 3-4.

[0089] It can be seen from this embodiment that the water leakage hole 10 is provided to facilitate the condensed liquid deposited on the partition 9 and between the partition and the inner wall of the condensation chamber 2 to fall down, thereby avoiding deposition.

[0090] Embodiment 5:

[0091] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0092] A connecting pipe 11, which is installed in the condensation box 1 and is used to connect two adjacent secondary condensation chambers 7;

[0093] Among them, a cold medium inlet 12 is opened on the secondary condensation chamber 7 located on the side of the condensation chamber 2 close to the air inlet 3, and a cold medium outlet 13 is opened on the secondary condensation chamber 7 located on the side of the condensation chamber 2 close to the air outlet 4; and the two ends of the connecting pipe 11 are preferably connected by flange ends.

[0094] It can be seen from the present embodiment that by providing the connecting pipe 11 and through the cold medium outlet 13 and the cold medium outlet 13, the second cold medium in the secondary condensation chamber 7 is easily circulated to help dissipate heat.

[0095] Embodiment 6:

[0096] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0097] A plurality of condensation tubes 6 located on both side walls of the condensation chamber 2 are alternately distributed.

[0098] It can be seen from the present embodiment that by arranging a plurality of condensation tubes 6 in an alternating distribution, a larger gas phase channel is provided, thereby ensuring the smooth flow of exhaust gas and the condensation efficiency.

[0099] Embodiment 7:

[0100] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0101] A heat insulation layer 14, the heat insulation layer 14 is located between the condensation chamber 2 and the secondary condensation chamber 7;

[0102] The heat insulation layer 14 is preferably made of asbestos.

[0103] It can be seen from this embodiment that by providing the heat insulation layer 14, the high temperature of the exhaust gas is prevented from affecting the second cooling medium in the secondary condensation chamber 7, thereby affecting the cooling effect on the first cooling medium.

[0104] Embodiment 8:

[0105] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0106] A spoiler 15, the spoiler 15 is installed on the inner wall of the secondary condensation chamber 7;

[0107] Wherein, the spoiler 15 comprises:

[0108] A spoiler plate 150, which is mounted on the inner wall of the secondary condensation chamber 7 and has a spoiler protrusion 151 on its circumference;

[0109] A driving motor 152, which is mounted on the surface of the condensing box 1 and is used to drive the spoiler 150 to rotate;

[0110] A sealing component is preferably provided between the spoiler disk 150 and the inner wall of the secondary condensation chamber 7 .

[0111] It can be seen from the present embodiment that by providing a spoiler device 15, it is convenient to make the second cold medium in the secondary condensation chamber 7 generate a larger flow, thereby improving the cooling effect of the second cold medium on the first cold medium. The spoiler plate 150 and the drive motor 152 have a simple structure and occupy a small space, which is convenient for the installation and arrangement of multiple extension tubes 8.

[0112] Embodiment 9:

[0113] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0114] An embedding groove 16, which is provided on the inner wall of the secondary condensation chamber 7;

[0115] The threaded protrusion 17 is arranged on a side of the spoiler 150 away from the axis;

[0116] The surface of the threaded protrusion 17 away from the spoiler 150 is loosely matched with the inner wall of the embedding groove 16 ; and the threaded protrusion 17 and the spoiler 150 are preferably integrally formed.

[0117] It can be seen from the present embodiment that by providing the embedding groove 16 and the threaded protrusion 17 disposed on the side of the spoiler 150 away from the axis, the second cold medium entering between the embedding groove 16 and the spoiler 150 is pushed outward when the spoiler 150 rotates, thereby preventing the second cold medium from further overflowing the gap between the embedding groove 16 and the spoiler 150, thereby improving the sealing effect.

[0118] Embodiment 10:

[0119] This embodiment provides a distillation tower tail gas ethanol condensation recovery system, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the condensation process includes the following steps:

[0120] S1: The tail gas generated by each distillation tower is introduced into the transfer tank, and then enters the condensation chamber 2 from the air inlet 3;

[0121] S2: The first cooling medium in the condenser tube 6 contacts and transfers heat with the exhaust gas through the condenser tube 6;

[0122] S3: the first cooling medium flowing in the condensation tube 6 enters the extension tube 8 and enters the secondary condensation chamber 7;

[0123] S4: The first cold medium in the extension tube 8 contacts and transfers heat with the second cold medium in the secondary condensation chamber 7 through the extension tube 8;

[0124] S5: the first cooling medium flowing in the extension tube 8 enters the condensation tube 6 and then the condensation chamber 2, and continues to contact and transfer heat with the exhaust gas;

[0125] S6: repeat S3-S6;

[0126] Among them, the transfer tank is a prior art and will not be described in detail here.

[0127] It can be seen from this embodiment that by continuously passing the second cold medium to reduce the first cold medium after heat transfer in contact with the tail gas, the downward trend of the temperature difference between the first cold medium and the tail gas is reduced, the condensation effect is ensured, and the ethanol recovery effect is improved.

[0128] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A distillation tower tail gas ethanol condensation recovery system, characterized in that: include: A condensation box (1), wherein a condensation chamber (2) is provided in the condensation box (1), and an inner wall of the condensation chamber (2) is provided with an air inlet (3), an air outlet (4) and a liquid outlet (5); A condenser (6), wherein the condenser (6) is installed in the condensation chamber (2) and a first cold medium flows in the condenser; A secondary condensation chamber (7), wherein the secondary condensation chamber (7) is multiple and is disposed in the condensation box (1) and is located on the side of the condensation chamber (2); An extension tube (8), the extension tube (8) is connected in series to the condensation tube (6) and extends into the secondary condensation chamber (7); A flow disturbance device (15), wherein the flow disturbance device (15) is installed on the inner wall of the secondary condensation chamber (7); The secondary condensation chamber (7) is filled with a second cold medium; The extension tube (8) comprises: A connecting section (80), the connecting section (80) extending from a side away from the condensation tube (6) into the secondary condensation chamber (7); A serpentine section (81), wherein the serpentine section (81) is located in the secondary condensation chamber (7); Wherein, the extension tube (8) is U-shaped, and has two connecting sections (80); The spoiler (15) comprises: A spoiler disk (150), the spoiler disk (150) being mounted on the inner wall of the secondary condensation chamber (7) and having a spoiler protrusion (151) disposed on the circumference of the surface; A driving motor (152), wherein the driving motor (152) is mounted on the surface of the condensation box (1) and is used to drive the spoiler (150) to rotate; An embedding groove (16), wherein the embedding groove (16) is provided on the inner wall of the secondary condensation chamber (7); A threaded protrusion (17), wherein the threaded protrusion (17) is arranged on a side of the spoiler (150) away from the axis; The surface of the threaded protrusion (17) away from the spoiler (150) is loosely matched with the inner wall of the embedding groove (16).

2. The distillation tower tail gas ethanol condensation recovery system according to claim 1, characterized in that: Also includes: a partition (9), the partition (9) being mounted on the inner wall of the condensation chamber (2), being located between two connecting sections (80) of the same extension tube (8), and being arranged parallel to the connecting section (80); Wherein, the partition plates (9) on both sides of the inner wall of the condensation chamber (2) are alternately distributed.

3. The distillation tower tail gas ethanol condensation recovery system according to claim 2, characterized in that: Also includes: A water leakage hole (10), wherein the water leakage hole (10) is provided on a side of the inner wall of the partition plate (9) close to the condensation chamber (2).

4. The distillation tower tail gas ethanol condensation recovery system according to claim 1, characterized in that: Also includes: A connecting pipe (11), the connecting pipe (11) is installed in the condensation box (1) and is used to connect two adjacent secondary condensation chambers (7); A cold medium inlet (12) is provided on the secondary condensation chamber (7) located on the side of the condensation chamber (2) close to the air inlet (3), and a cold medium outlet (13) is provided on the secondary condensation chamber (7) located on the side of the condensation chamber (2) close to the air outlet (4).

5. The distillation tower tail gas ethanol condensation recovery system according to claim 1, characterized in that: A plurality of condensation tubes (6) located on both side walls of the condensation chamber (2) are alternately distributed.

6. The distillation tower tail gas ethanol condensation recovery system according to claim 1, characterized in that: Also includes: A heat insulation layer (14), wherein the heat insulation layer (14) is located between the condensation chamber (2) and the secondary condensation chamber (7).

7. The distillation tower tail gas ethanol condensation recovery system according to claim 1, characterized in that: Condensation process The following steps are involved: S1: The tail gas generated by each distillation tower is introduced into the transfer tank, and then enters the condensation chamber (2) from the air inlet (3); S2: the first cooling medium in the condenser (6) contacts and transfers heat with the exhaust gas through the condenser (6); S3: the first cold medium flowing in the condensation tube (6) enters the extension tube (8) and enters the secondary condensation chamber (7); S4: the first cold medium in the extension tube (8) contacts and transfers heat with the second cold medium in the secondary condensation chamber (7) through the extension tube (8); S5: the first cold medium flowing in the extension tube (8) enters the condensation tube (6) and then the condensation chamber (2), and continues to contact and transfer heat with the exhaust gas; S6: Repeat S3-S6.

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