Heat recovery tower for alcohol production

Abstract

The utility model discloses a heat recovery tower for alcohol production, which belongs to the technical field of heat recovery and comprises an outer tower body, a heat exchange pipe fitting, a plurality of heat exchange cylinders and a plurality of groups of stirring components, a refrigerant input pipe and a refrigerant output pipe are arranged on the outer tower body, and a heating medium input pipe and a heating medium output pipe are arranged at the bottom of the outer tower body; the plurality of heat exchange cylinders are uniformly distributed in the outer tower body, are provided with connecting ports and are sequentially communicated through the connecting ports; the heat exchange pipe fitting comprises heat exchange pipes arranged in heat exchange cylinders, the multiple heat exchange pipes are sequentially connected through straight guide pipes according to the arrangement sequence of the heat exchange cylinders, and an input pipe and an output end of the heat exchange pipe fitting are correspondingly connected with a refrigerant input pipe and a refrigerant output pipe correspondingly. By reducing the heat exchange temperature difference of cold and hot media, the heat stress generated by the inner wall of the heat exchange tube is reduced, the material fatigue of the heat exchange tube is reduced, the cracking risk of the heat exchange tube is reduced, and the service life of the heat exchange tube is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat recovery, and particularly relates to a heat recovery tower for alcohol production. Background Art

[0002] A heat recovery tower is a device for recovering heat. During the industrial production process, a large amount of heat is usually generated. If this heat can be effectively recovered and utilized, it can not only save energy but also reduce production costs. The working principle of the heat recovery tower is to use the heat conduction in the heat exchanger to transfer the waste heat to the material or medium that needs to be heated, so as to increase its temperature. In this way, the waste heat can be effectively utilized and the energy utilization rate can be improved.

[0003] Hydrogenation reactions are often applied in alcohol production. A large amount of heat is generated during the hydrogenation reaction process. Generally, a heat recovery device is added to collect the heat generated by the hydrogenation reaction. However, the existing heat recovery devices usually use heat exchange tubes to introduce a refrigerant medium to exchange heat with the hot medium reactants to achieve energy recovery. However, due to the large amount of heat generated by the hydrogenation reaction, there is a large temperature difference between the cold and hot media. During heat exchange, uneven thermal expansion occurs inside and outside the heat exchange tubes, resulting in thermal stress on the tube walls, which may cause the tube walls to crack or deform. Long-term use will cause fatigue of the heat exchange tube material and reduce its service life.

[0004] Therefore, we propose a heat recovery tower for alcohol production to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem in the prior art that when the heat exchange temperature difference is too large, it will cause fatigue of the heat exchange tube material and reduce its service life, and to propose a heat recovery tower for alcohol production.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A heat recovery tower for alcohol production, comprising:

[0008] An outer tower body, on which a refrigerant input pipe and a refrigerant output pipe are arranged, and a hot medium input pipe and a hot medium output pipe are arranged at the bottom of the outer tower body;

[0009] A plurality of heat exchange cylinders, which are evenly distributed in the outer tower body, and a connection port is arranged on each of the plurality of heat exchange cylinders and they are sequentially communicated through the connection port. The refrigerant output pipe and the hot medium input pipe are communicated with the first heat exchange cylinder, and the refrigerant input pipe and the hot medium output pipe are communicated with the last heat exchange cylinder;

[0010] The heat exchange pipe fitting includes heat exchange pipes arranged inside the heat exchange cylinder. A plurality of the heat exchange pipes are sequentially connected through straight conduits according to the arrangement order of the heat exchange cylinder. The input end and the output end of the heat exchange pipe fitting are respectively connected to the corresponding refrigerant input pipe and the refrigerant output pipe;

[0011] Multiple stirring assemblies are used to stir the heat medium inside the heat exchange cylinder.

[0012] Preferably, the heat exchange pipes are spiral.

[0013] Preferably, the connection port is located at the top of the heat exchange cylinder, and the output end of the connection port is connected with an extension pipe extending to the bottom of the heat exchange cylinder.

[0014] Preferably, the stirring assembly includes a mounting shaft rotatably arranged coaxially inside the heat exchange cylinder. Stirring blades are fixedly installed on the mounting shaft, and a transmission mechanism is arranged between multiple mounting shafts.

[0015] Preferably, the stirring blades are spiral.

[0016] Preferably, the transmission mechanism includes a motor and a driving gear rotatably arranged at the bottom of the outer tower body. The motor is coaxially and fixedly connected with the driving gear. Driven gears are fixedly arranged on the mounting shaft, and multiple driven gears are all meshed with the driving gear.

[0017] In summary, the technical effects and advantages of the present utility model are as follows: For the heat recovery tower in alcohol production, by arranging multiple heat exchange cylinders, the heat medium gradually enters the heat exchange cylinder at the end from the first heat exchange cylinder, forming a heat medium with a decreasing temperature between each heat exchange cylinder. The refrigerant enters from the end for heat exchange, is gradually heated, and then exchanges heat with the high-temperature heat medium, reducing the heat exchange temperature difference between the cold and hot media, thereby reducing the thermal stress generated on the inner wall of the heat exchange pipe, reducing the material fatigue of the heat exchange pipe, reducing the risk of heat exchange pipe rupture, prolonging the service life of the heat exchange pipe, and improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional structure schematic diagram of the present utility model;

[0019] Figure 2 It is a transverse sectional structure schematic diagram of the present utility model;

[0020] Figure 3 It is a structure schematic diagram of the outer tower body and the heat exchange cylinder of the present utility model;

[0021] Figure 4 It is a structure schematic diagram of the heat exchange pipe fitting in the present utility model;

[0022] Figure 5 It is a structure schematic diagram of the stirring assembly in the present utility model;

[0023] Figure 6 This is a schematic structural view of the transmission mechanism in the present utility model.

[0024] In the figure: 1. Outer tower body; 11. Refrigerant input pipe; 12. Refrigerant output pipe; 13. Heat medium input pipe; 14. Heat medium output pipe; 2. Heat exchange cylinder; 21. Extension pipe; 3. Heat exchange pipe fitting; 31. Heat exchange pipe; 32. Straight conduit; 4. Stirring assembly; 41. Installation shaft; 42. Stirring blade; 43. Driving gear; 44. Motor; 45. Driven gear. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0026] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0027] Referring to Figures 1-3 , a heat recovery tower for alcohol production includes an outer tower body 1, a heat exchange pipe fitting 3, a plurality of heat exchange cylinders 2 and a plurality of groups of stirring assemblies 4.

[0028] A refrigerant input pipe 11 and a refrigerant output pipe 12 are provided on the outer tower body 1. The refrigerant input pipe 11 is used to connect to a refrigerant medium, and the refrigerant output pipe 12 is used to discharge the refrigerant medium. A heat medium input pipe 13 and a heat medium output pipe 14 are provided at the bottom of the outer tower body 1. The heat medium input pipe 13 is used to connect to a heat medium, and the heat medium output pipe 14 is used to discharge the heat medium.

[0029] A plurality of heat exchange cylinders 2 are evenly distributed inside the outer tower body 1. Heat insulation cotton is filled in the gap between the outer tower body 1 and the heat exchange cylinders 2 to reduce heat loss and improve the heat exchange effect. A connection port is provided on each of the plurality of heat exchange cylinders 2 and they are sequentially connected through the connection ports. The refrigerant output pipe 12 and the heat medium input pipe 13 are connected to the first heat exchange cylinder 2, and the refrigerant input pipe 11 and the heat medium output pipe 14 are connected to the last heat exchange cylinder 2. The heat medium generated by the alcohol reaction is input into the first heat exchange cylinder 2 at the head end through the heat medium input pipe 13, and then enters the next heat exchange cylinder 2 through the connection port, and so on until the heat medium enters the last heat exchange cylinder 2 at the end and is discharged through the heat medium output pipe 14. The connection port is located at the top of the heat exchange cylinder 2. Since the connection port is located at the top, the output end of the connection port is connected with an extension pipe 21 extending to the bottom of the heat exchange cylinder 2. Therefore, after the heat exchange cylinder 2 is filled and the liquid level reaches the position of the connection port, it will flow into the bottom of the next heat exchange cylinder 2 through the extension pipe 21. In this way, the heat medium in each heat exchange cylinder 2 can be independent of each other without interference, which is convenient for forming a stepped temperature difference of the heat medium in each heat exchange cylinder 2.

[0030] The heat exchange pipe fitting 3 includes heat exchange pipes 31 disposed inside the heat exchange cylinder 2. A plurality of heat exchange pipes 31 are sequentially connected through straight conduits 32 in accordance with the arrangement sequence of the heat exchange cylinder 2. The input end and the output end of the heat exchange pipe fitting 3 are respectively connected corresponding to the refrigerant input pipe 11 and the refrigerant output pipe 12. The refrigerant medium enters the heat exchange pipe fitting 3 through the refrigerant input pipe 11. The heat medium in the heat exchange cylinder 2 submerges the heat exchange pipes 31, and the refrigerant exchanges heat with the heat medium through the heat exchange pipes 31 to recover the heat in the heat medium.

[0031] Among them, the refrigerant input pipe 11 is connected to the heat exchange pipe 31 inside the heat exchange cylinder 2 at the end, and the refrigerant output pipe 12 is connected to the heat exchange pipe 31 inside the heat exchange cylinder 2 at the head end. Therefore, the flowing direction of the refrigerant is opposite to the flowing direction of the heat medium. When heat exchange occurs, the temperature of the heat medium in the heat exchange cylinder 2 at the end is the lowest, and the temperature of the heat medium in the heat exchange cylinder 2 at the head end is the highest. The heat medium in each heat exchange cylinder 2 presents a stepped temperature difference change. When the refrigerant enters the heat exchange pipe 31, the heat medium with a lower temperature is the first to conduct heat exchange. When the temperature of the refrigerant rises, it enters the next heat exchange cylinder 2 and continues to exchange heat until the refrigerant exchanges heat with the heat medium in all the heat exchange cylinders 2 and then is discharged. During the heat exchange process, the temperature of the refrigerant continuously rises, and the temperature of the heat medium for the refrigerant to exchange heat also gradually increases. Therefore, it is possible to avoid the direct heat exchange between the low-temperature refrigerant and the high-temperature heat medium. Instead, by gradually increasing the temperature of the refrigerant, the temperature difference between the cold and hot media inside and outside the heat exchange pipe 31 is controlled, ensuring that there is no excessive temperature difference inside and outside the heat exchange pipe 31 that may cause uneven thermal expansion inside and outside the heat exchange pipe 31, thereby generating thermal stress that may cause the pipe wall to crack or deform, so as to reduce the pipe fatigue of the heat exchange pipe 31 and improve the service life of the heat exchange pipe 31.

[0032] Refer to Figures 2-4 , the heat exchange pipes 31 are in a spiral shape. The spiral design can increase the heat exchange surface area between the pipe wall of the heat exchange pipes 31 and the heat exchange medium, thereby improving the heat exchange efficiency, and can also make the refrigerant flow more evenly in the pipeline, thereby improving the uniformity of heat exchange.

[0033] Multiple groups of stirring assemblies 4 are used to stir the heat medium in the heat exchange cylinder 2. By stirring the heat medium, the thermal boundary layer around the heat medium can be broken, making the heat distribution of the heat medium more uniform, promoting heat transfer, increasing the heat conduction rate, and improving the heat transfer efficiency.

[0034] Refer to Figures 2-6 , the stirring assembly 4 includes a mounting shaft 41 coaxially and rotatably disposed inside the heat exchange cylinder 2. Stirring blades 42 are fixedly installed on the mounting shaft 41. The stirring blades 42 are in a spiral shape. A transmission mechanism is provided between multiple mounting shafts 41. The multiple mounting shafts 41 are driven to rotate synchronously through the transmission mechanism, driving the stirring blades 42 to rotate to stir the heat medium in the heat exchange cylinder 2, and the rotating stirring blades 42 can form a swirling flow inside the heat exchange cylinder 2, effectively mixing the heat medium evenly and improving the stirring efficiency.

[0035] Reference Figures 5-6 Figures 5-6 , the transmission mechanism includes a motor 44 and a driving gear 43 rotatably arranged at the bottom of the outer tower body 1. The motor 44 is coaxially and fixedly connected to the driving gear 43. A driven gear 45 is fixedly arranged on the mounting shaft 41. A plurality of driven gears 45 are all meshed with the driving gear 43. By rotating the motor 44 to drive the driving gear 43 to rotate, the driving gear 43 synchronously drives a plurality of driven gears 45 to rotate, driving the mounting shaft 41 to rotate.

[0036] Working principle:

[0037] During use, the heat medium generated by the alcohol reaction is connected to the heat medium input pipe 13. The heat medium is input into the heat exchange cylinder 2 at the head end through the heat medium input pipe 13. When the heat exchange cylinder 2 at the head end is filled, the liquid level reaches the connection port position and will flow into the bottom of the next heat exchange cylinder 2 through the extension pipe 21. After the heat medium in the heat exchange cylinder 2 submerges the heat exchange pipe 31, the refrigerant is connected into the refrigerant input pipe 11. The refrigerant exchanges heat with the heat medium through the heat exchange pipe 31. During the heat exchange, the heat medium in the heat exchange cylinder 2 at the end has the lowest temperature, and the heat medium in the heat exchange cylinder 2 at the head end has the highest temperature. The heat medium in each heat exchange cylinder 2 shows a stepped temperature difference change. When the refrigerant enters the heat exchange pipe 31, the heat medium with a lower temperature is the first to exchange heat. When the temperature of the refrigerant rises, it enters the next heat exchange cylinder 2 to continue the heat exchange until the refrigerant exchanges heat with the heat medium in all the heat exchange cylinders 2 and then is discharged, avoiding the direct heat exchange between the low-temperature refrigerant and the high-temperature heat medium, reducing the pipeline fatigue of the heat exchange pipe 31, and improving the service life of the heat exchange pipe 31.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A heat recovery tower for alcohol production, characterized in that: include: An outer tower body (1), wherein a refrigerant input pipe (11) and a refrigerant output pipe (12) are arranged on the outer tower body (1), and a heat medium input pipe (13) and a heat medium output pipe (14) are arranged at the bottom of the outer tower body (1); A plurality of heat exchange tubes (2) are evenly distributed in the outer tower body (1), and the plurality of heat exchange tubes (2) are provided with connection ports and are sequentially connected through the connection ports, the refrigerant output pipe (12) and the heat medium input pipe (13) are connected to the head end heat exchange tube (2), and the refrigerant input pipe (11) and the heat medium output pipe (14) are connected to the tail end heat exchange tube (2); The heat exchange pipe fitting (3) comprises a heat exchange pipe (31) arranged in the heat exchange tube (2), wherein a plurality of the heat exchange pipes (31) are sequentially connected via a straight pipe (32) according to the arrangement order of the heat exchange tube (2), and the input pipe and output end of the heat exchange pipe fitting (3) are respectively connected to the refrigerant input pipe (11) and the refrigerant output pipe (12); A plurality of stirring components (4) are used to stir the heat medium in the heat exchange cylinder (2).

2. A heat recovery tower for alcohol production according to claim 1, characterized in that: The heat exchange tube (31) is in a spiral shape.

3. The heat recovery tower for alcohol production according to claim 1, characterized in that: The connection port is located at the top of the heat exchange cylinder (2), and an output end of the connection port is connected to an extension pipe (21) extending to the bottom of the heat exchange cylinder (2).

4. The heat recovery tower for alcohol production according to claim 1, characterized in that: The stirring assembly (4) comprises a mounting shaft (41) coaxially rotatably arranged in the heat exchange cylinder (2), a stirring blade (42) being fixedly mounted on the mounting shaft (41), and a transmission mechanism being arranged between a plurality of the mounting shafts (41).

5. A heat recovery tower for alcohol production according to claim 4, characterized in that: The stirring blade (42) is spiral-shaped.

6. A heat recovery tower for alcohol production according to claim 4, characterized in that: The transmission mechanism comprises a motor (44) and a driving gear (43) rotatably arranged at the bottom of the outer tower body (1); the motor (44) and the driving gear (43) are coaxially fixedly connected; a driven gear (45) is fixedly arranged on the mounting shaft (41); and a plurality of the driven gears (45) are meshed with the driving gear (43).

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