An ethanol recovery tower reboiler

Abstract

This application discloses an ethanol recovery tower reboiler, belonging to the field of ethanol recovery technology. It mainly includes a shell, inside which a heat exchanger is installed. At least two sets of air inlets are installed at the upper end of the shell, with air inlet pipes installed at each inlet. A temporary storage box is installed at the input end of the air inlet pipes, and a switching mechanism is installed at the upper end of the temporary storage box. The switching mechanism includes an inlet at the upper end of the temporary storage box, a rotating shaft installed at the center inside the temporary storage box, a sealing plate installed on the rotating shaft, and an operating rod installed on one side of the rotating shaft. This ethanol recovery tower reboiler, by setting up a switching mechanism, achieves the effect of switching activated carbon without shutting down the system.

Description

Technical Field

[0001] This application relates to the field of ethanol recovery technology, specifically to an ethanol recovery tower reboiler. Background Technology

[0002] In the industrial production of N,N-dimethylaminoacrylate, ethanol recovery is a key factor affecting cost-effectiveness. The traditional process uses a distillation column-reboiler system, in which the reboiler achieves efficient recovery of ethanol solution at the bottom of the column by heating it with steam.

[0003] For example, patent CN218130044U discloses a recovery device for recovering methanol and ethanol. This patent sets up a heat source at the top of the ethanol tower T5, which is thermally coupled to the pre-tower T1 through the heat circulation system of the methanol recovery tower to provide heat for the pre-tower reboiler. After the heated steam condenses, it returns to the ethanol tower T5, making full use of the heat of the steam at the top of the ethanol tower T5, reducing the amount of circulating water used, and reducing the steam consumption of the pre-tower reboiler.

[0004] In actual operation, a single-channel filter screen is usually installed at the steam inlet to intercept pipeline rust and impurities. When the activated carbon adsorption is saturated or the filter screen is clogged, the machine must be stopped to disassemble and replace it. However, ethanol recovery is a key link in continuous production. Stopping the machine will cause the entire production line to be interrupted, affecting the synthesis progress of N,N-dimethylaminoacrylate. Resuming production requires reheating, adjusting process parameters, increasing unplanned downtime, and reducing overall production efficiency.

[0005] Therefore, it is necessary to provide an ethanol recovery tower reboiler to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide an ethanol recovery tower reboiler, which solves the problem that shutdown will lead to the interruption of the entire production line and affect the synthesis progress of N,N-dimethylaminoacrylate.

[0008] The technical solution adopted by this application to solve its technical problem is: an ethanol recovery tower reboiler, comprising:

[0009] The casing, inside which a heat exchanger is installed;

[0010] At least two sets of air inlets are provided at the upper end of the housing;

[0011] An air intake pipe is disposed on the air intake port;

[0012] A temporary storage box is disposed at the inlet end of the intake pipe;

[0013] A switching mechanism is installed on the upper end of the temporary storage box, and the switching mechanism includes:

[0014] An inlet port is installed at the upper end of the temporary storage box;

[0015] A rotating shaft is installed at the internal center of the temporary storage box;

[0016] A sealing plate is mounted on the rotating shaft, and the dimensions of the sealing plate are matched with the dimensions of the intake pipe inlet end.

[0017] An operating lever is mounted on one side of the rotating shaft.

[0018] Furthermore, sealing gaskets are provided on both working surfaces of the sealing plate.

[0019] Furthermore, the operating lever is provided with a locking hole, and corresponding positioning holes are provided on both sides of the outer wall of the temporary storage box. A chain is fixedly provided on the outer side of the temporary storage box, and a positioning pin is connected to the end of the chain. The size of the positioning pin matches the locking hole and the positioning hole.

[0020] Furthermore, each intake pipe is equipped with a filter assembly. The filter assembly includes slides fixedly disposed on both sides of the inner wall of the intake pipe. A fixing frame is slidably disposed inside the slides, and the fixing frame is filled with activated carbon that matches the diameter of the intake pipe.

[0021] Furthermore, the side wall of the air intake pipe has a through hole, the size of which allows the fixing frame to slide out laterally, the edge of the through hole is covered with a high-temperature resistant rubber sealing strip, and a handle is fixedly installed at the outer end of the fixing frame.

[0022] The beneficial effects of this application are: the ethanol recovery tower reboiler provided by this application achieves the effect of switching the filter screen without stopping the machine by setting a switching mechanism.

[0023] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1This is an overall schematic diagram of an ethanol recovery tower reboiler according to this application;

[0026] Figure 2 This is an overall explosion diagram of an ethanol recovery tower reboiler according to this application;

[0027] Figure 3 for Figure 2 A schematic diagram of the switching mechanism;

[0028] Figure 4 for Figure 2 Cross-sectional schematic diagram of the switching mechanism;

[0029] Figure 5 for Figure 3 A schematic diagram of A in the middle;

[0030] Figure 6 for Figure 4 A schematic diagram of B in the middle;

[0031] Figure 7 for Figure 4 A schematic diagram of C in the middle;

[0032] The following are the labeling elements in the figures:

[0033] 1. Shell; 2. Cavity; 3. Heat exchanger; 30. Liquid inlet; 31. Discharge outlet; 4. Drain outlet; 5. Air inlet; 50. Air inlet pipe; 51. Filter assembly; 510. Slide rail; 512. Fixing frame; 513. Activated carbon; 514. Handle; 515. Through hole; 6. Switching mechanism; 60. Temporary storage box; 61. Inlet; 62. Sealing plate; 63. Rotating shaft; 64. Operating lever; 65. Positioning hole; 66. Chain; 67. Positioning pin; 68. Positioning hole. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] like Figures 1-3As shown, this application provides an ethanol recovery tower reboiler, which is installed at the bottom of an ethanol distillation tower and achieves efficient ethanol recovery through steam heating. It is mainly used in the N,N-dimethylaminoacrylate preparation system. Specifically, the ethanol recovery tower reboiler includes a shell 1 and a cavity 2 is provided inside the shell 1. The cavity 2 is used to fill the hot steam for heating the ethanol solution.

[0037] To efficiently recover the ethanol solvent in the preparation process of N,N-dimethylaminoacrylate, a heat exchanger 3 is fixedly installed at the center of the cavity 2. The heat exchanger 3 adopts the shell and tube heat exchanger disclosed in the existing patent CN215725307U. At the same time, the heat exchanger 3 extends through the side wall of the shell 1 to the outside, and is provided with an inlet 30 for introducing the ethanol solution to be heated and a outlet 31 for discharging the heated ethanol solution. Thus, heat exchange can be carried out through the hot steam inside the cavity 2.

[0038] Furthermore, a drain outlet 4 is provided at the bottom of the casing 1 to drain the water accumulated by the condensation of hot steam;

[0039] To allow hot steam to be introduced into the internal cavity 2 of the housing 1, at least two sets of air inlets 5 are provided at the top of the housing 1. These air inlets 5 are connected to the cavity 2 to facilitate the introduction of hot steam into the cavity 2. Additionally, an air inlet pipe 50 is provided at the upper end of each air inlet 5. Figures 2-4 and Figure 7 As shown, a filter assembly 51 is installed inside each air intake pipe 50 to facilitate subsequent filtration operations.

[0040] The filter assembly 51 includes parallel slides 510 fixedly disposed on both sides of the inner wall of the air inlet pipe 50. A fixing frame 512 is slidably disposed inside the slides 510. Activated carbon 513 matching the pipe diameter of the air inlet pipe 50 is filled in the fixing frame 512 to facilitate subsequent filtration of hot steam.

[0041] Meanwhile, a through hole 515 is provided on the side wall of the air inlet pipe 50. The size of the through hole 515 allows the fixing frame 512 to slide out laterally. A high-temperature resistant rubber sealing strip (not shown in the figure) is wrapped around the edge of the through hole 515. At the same time, a handle 514 is fixedly provided at the outer end of the fixing frame 512 so that the operator can pull out and replace the activated carbon 513.

[0042] To achieve replacement work without shutting down the machine, such as Figures 2-7 As shown, a switching mechanism 6 is provided at the top of the air intake pipe 50. The switching mechanism 6 includes a temporary storage box 60 fixedly installed at the input end of the two sets of air intake pipes 50. In order to centrally introduce hot steam, an inlet 61 is opened in the center of the top of the temporary storage box 60 and is connected to the external steam main pipe through a flange. Hot steam can be introduced through the inlet 61 and then diverted to the two sets of air intake pipes 50 through the temporary storage box 60.

[0043] To achieve the goal of replacing without shutting down the machine, a rotating shaft 63 is rotatably installed at the center of the temporary storage box 60. The end of the rotating shaft 63 is equipped with a mechanical seal to prevent steam leakage, and a sealing plate 62 is fixedly connected to the rotating shaft 63. Sealing gaskets (not shown in the figure) are provided on both working surfaces of the sealing plate 62, and the size of the sealing plate 62 matches the size of the input end of the air inlet pipe 50, so as to achieve the effect of sealing the input ends of the two sets of air inlet pipes 50 in the future.

[0044] To facilitate operation and control, an operating lever 64 is fixedly installed on one end of the rotating shaft 63. The operating lever 64 is provided with a locking hole 68. To ensure the reliability of the operating position, corresponding positioning holes 65 are provided on both sides of the outer wall of the temporary storage box 60. A chain 66 is fixedly installed on the outside of the temporary storage box 60, and a positioning pin 67 is connected to the end of the chain 66. The size of the positioning pin 67 matches the locking hole 68 and the positioning hole 65, so that when the sealing plate 62 is rotated to the corresponding position by rotating the operating lever 64, the positioning pin 67 can be inserted into the locking hole 68 and the positioning hole 65, thereby positioning the operating lever 64 to achieve the effect of locking the position of the sealing plate 62.

[0045] Therefore, when the activated carbon 513 in one of the intake pipes 50 needs to be replaced, the operator first pulls out the positioning pin 67. After pulling it out, push the operating lever 64 to drive the rotating shaft 63 to drive the sealing plate 62 to rotate to the position that completely covers the input end of the secondary intake pipe 50.

[0046] Then, the positioning pin 67 is passed through the locking hole 68 of the operating rod 64 and precisely inserted into the corresponding positioning hole 65 to form a mechanical interlock. At this time, the other set of air intake pipes 50 remains fully open, and the hot steam is completely introduced into the other set of air intake pipes 50 through the temporary storage box 60. At this time, the operator uses the handle 514 to pull out the fixing frame 512 along the slide 510 until the fixing frame 512 is completely detached. Finally, after replacing the activated carbon 513, push it back to the initial position, reset it, and then push the operating rod 64 back to the middle position. At this time, the dual channels resume parallel steam supply. By doing so, the effect of replacing the activated carbon 513 without stopping the machine can be achieved.

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An ethanol recovery column reboiler characterized by: include: The shell (1) is provided with a heat exchanger (3) inside the shell (1); At least two sets of air inlets (5) are provided on the upper end of the housing (1); An air intake pipe (50) is provided on the air intake port (5); Temporary storage box (60) is provided at the input end of the air intake pipe (50); A switching mechanism (6) is installed on the upper end of the temporary storage box (60), and the switching mechanism (6) includes: An inlet (61) is installed at the upper end of the temporary storage box (60); A rotating shaft (63) is installed at the center of the interior of the temporary storage box (60); A sealing plate (62) is mounted on the rotating shaft (63), and the dimensions of the sealing plate (62) are matched with the dimensions of the inlet end of the air intake pipe (50); An operating lever (64) is mounted on one side of the rotating shaft (63).

2. An ethanol recovery column reboiler according to claim 1, characterized in that: The sealing plate (62) has sealing gaskets on both sides of its working surface.

3. An ethanol recovery column reboiler according to claim 1, characterized in that: The operating lever (64) is provided with a locking hole (68), and the temporary storage box (60) has corresponding positioning holes (65) on both sides of its outer wall. A chain (66) is fixedly provided on the outer side of the temporary storage box (60), and a positioning pin (67) is connected to the end of the chain (66). The size of the positioning pin (67) matches the locking hole (68) and the positioning hole (65).

4. An ethanol recovery column reboiler according to claim 1, characterized in that: Each air intake pipe (50) is equipped with a filter assembly (51). The filter assembly (51) includes a slide (510) fixedly disposed on both sides of the inner wall of the air intake pipe (50). A fixing frame (512) is slidably disposed inside the slide (510). The fixing frame (512) is filled with activated carbon (513) that matches the diameter of the air intake pipe (50).

5. An ethanol recovery column reboiler according to claim 4, characterized in that: The air intake pipe (50) has a through hole (515) on its side wall. The size of the through hole (515) allows the fixed frame (512) to slide out laterally. The edge of the through hole (515) is covered with a high-temperature resistant rubber sealing strip. A handle (514) is fixedly installed at the outer end of the fixed frame (512).

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