Ethylene glycol tail gas recovery device

Abstract

The utility model discloses an ethylene glycol tail gas recovery device which comprises a base, the top end of the base is fixedly connected with a tubular heat exchanger, the top end of the tubular heat exchanger is fixedly connected with one end of a connecting pipe, the middle of the connecting pipe is fixedly connected with a pretreatment box, and the other end of the connecting pipe is fixedly connected with one end of a U-shaped pipe. The other end of the U-shaped pipe is fixedly connected with a fan, and the fan is fixedly connected with an air inlet pipe. The ethylene glycol in the tail gas is condensed and collected through the tubular heat exchanger, the arranged U-shaped pipe prevents the ethylene glycol from flowing back during condensation, waste of the ethylene glycol is reduced, the pretreatment box pretreats the tail gas and filters other impurities in the tail gas, and the working efficiency of the tubular heat exchanger is prevented from being affected.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene glycol recovery, in particular to an ethylene glycol tail gas recovery device. Background Art

[0002] At present, the slurry preparation tanks in the polyester system are equipped with vent pipes, which continuously discharge tail gas containing ethylene glycol, and there is no relevant treatment and recovery device. Direct discharge of tail gas containing ethylene glycol will pollute the air and bring a lot of odor to the production area. In addition, the tail gas containing ethylene glycol condenses into liquid wastewater and enters the sewer and even the river around the factory, which will further pollute the ecological environment; at the same time, a large amount of ethylene glycol is wasted.

[0003] In this regard, a Chinese patent with publication number CN202983274U discloses an ethylene glycol recovery device, including a waste gas inlet pipe, a condenser, an ethylene glycol filter tank, and an outlet, wherein the waste gas inlet pipe is surrounded by a condenser; the waste gas inlet pipe is connected to the ethylene glycol filter tank, and the ethylene glycol filter tank is connected to the outlet.

[0004] The device recovers ethylene glycol by condensing ethylene glycol through a condenser. The exhaust gas inlet pipe is directly connected to the ethylene glycol filter tank in a straight line. When the exhaust gas condenses, the air pressure will decrease, and the liquid in the ethylene glycol filter tank will flow back into the inlet pipe. At the same time, other impurities in the exhaust gas cannot be removed. For this reason, we propose an ethylene glycol exhaust gas recovery device to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide an ethylene glycol tail gas recovery device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ethylene glycol tail gas recovery device, comprising a base, the top end of the base is fixedly connected to a shell-and-tube heat exchanger, the top end of the shell-and-tube heat exchanger is fixedly connected to one end of a connecting pipe, the middle part of the connecting pipe is fixedly connected to a pretreatment box, the other end of the connecting pipe is fixedly connected to one end of a U-shaped tube, the other end of the U-shaped tube is fixedly connected to a fan, and the fan is fixedly connected to an air intake pipe.

[0007] Preferably, one end of the connecting pipe away from the pretreatment box is fixedly connected with a flange.

[0008] Preferably, the pretreatment box includes a cylinder, a filter plate, a cleaning strip, a connecting ring, a transmission shaft, a worm gear blade, and a support frame. The two ends of the cylinder are coaxially fixedly connected to the connecting pipe, and the filter plate is fixedly installed on the inner wall of the cylinder close to the U-tube. The top of the filter plate slides against a plurality of cleaning strips, and one end of the cleaning strips is fixedly connected to the connecting ring. The connecting ring is fixedly sleeved on one end of the transmission shaft. The transmission shaft is rotatably connected to the filter plate, and the other end of the transmission shaft is rotatably connected to the support frame. The support frame is fixedly connected to the inner wall of the cylinder, and the middle part of the transmission shaft is fixedly connected to a plurality of worm gear blades, and the worm gear blades are rotatably arranged between the filter plate and the support frame.

[0009] Preferably, the cleaning strips are evenly distributed around the circumference, and the transmission shaft is coaxially arranged with the cylinder.

[0010] Compared with the prior art, the beneficial effects of the utility model are: ethylene glycol in the exhaust gas is condensed and collected through a shell-and-tube heat exchanger, the U-shaped tube is arranged to avoid reflux of ethylene glycol during condensation, thereby reducing the waste of ethylene glycol, and the pretreatment box pretreats the exhaust gas and filters other impurities in the exhaust gas to avoid affecting the working efficiency of the shell-and-tube heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the cross-sectional structure of the pretreatment box of the utility model;

[0013] Figure 3 It is an enlarged schematic diagram of the cross-sectional structure of the pretreatment box of the utility model.

[0014] In the figure: base 1, shell and tube heat exchanger 2, connecting pipe 3, flange 31, pretreatment box 4, cylinder 41, filter plate 42, cleaning strip 43, connecting ring 44, transmission shaft 45, worm wheel blade 46, support frame 47, U-shaped tube 5, fan 6, air inlet pipe 7. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Example 1

[0017] Reference Figure 1 , 2, is the first embodiment of the utility model, which provides an ethylene glycol tail gas recovery device, including a base 1, the top of the base 1 is fixedly connected to a shell and tube heat exchanger 2, the top of the shell and tube heat exchanger 2 is fixedly connected to one end of a connecting pipe 3, the middle of the connecting pipe 3 is fixedly connected to a pretreatment box 4, the other end of the connecting pipe 3 is fixedly connected to one end of a U-shaped tube 5, the other end of the U-shaped tube 5 is fixedly connected to a fan 6, and the fan 6 is fixedly connected to an air intake pipe 7.

[0018] The exhaust gas is drawn by the fan 6 and flows into the air inlet pipe 7. The exhaust gas passes through the U-shaped tube 5 and enters the pretreatment box 4 for treatment. The impurities in the exhaust gas are cleaned, and then the exhaust gas enters the shell and tube heat exchanger 2 for condensation. The ethylene glycol is collected after condensation, which reduces the waste of ethylene glycol. The U-shaped tube 5 is set to avoid reflux of ethylene glycol during condensation.

[0019] Example 2

[0020] Reference Figure 1-3 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment. Specifically, one end of the connecting pipe 3 away from the pretreatment box 4 is fixedly connected with a flange 31. The setting of the flange 31 makes it convenient to use bolts to fix the connecting pipe 3 to the U-tube and the shell-and-tube heat exchanger 2.

[0021] Specifically, the pretreatment box 4 includes a cylinder 41, a filter plate 42, a cleaning strip 43, a connecting ring 44, a transmission shaft 45, a worm wheel blade 46, and a support frame 47. The two ends of the cylinder 41 are coaxially fixedly connected to the connecting pipe 3. The filter plate 42 is fixedly installed on the inner wall of the cylinder 41 on one side close to the U-shaped tube 5. The top of the filter plate 42 slides against a plurality of cleaning strips 43. One end of the cleaning strip 43 is fixedly connected to the connecting ring 44. The connecting ring 44 is fixedly sleeved on one end of the transmission shaft 45. The transmission shaft 45 is rotatably connected to the filter plate 42. The other end of the transmission shaft 45 is rotatably connected to the support frame 47. The support frame 47 is fixedly connected to the inner wall of the cylinder 41. The middle part of the transmission shaft 45 is fixedly connected to a plurality of worm wheel blades 46. The worm wheel blades 46 are rotatably arranged between the filter plate 42 and the support frame 47.

[0022] Furthermore, the cleaning strips 43 are evenly distributed around the circumference, and the transmission shaft 45 is coaxially arranged with the cylinder 41. The fan 6 draws exhaust gas from the intake pipe 7, and the exhaust gas passes through the U-shaped pipe 5 and enters the pretreatment box 4 for treatment. The filter plate 42 filters the impurities in the exhaust gas. At the same time, the flow force of the exhaust gas after passing through the filter plate 42 drives the worm wheel blades 46 to rotate, and the worm wheel blades 46 drive the fixed transmission shaft 45 to rotate, and the transmission shaft 45 drives the fixed connecting ring 44 to rotate around the circumference, and the connecting ring 44 drives the fixed cleaning strips 43 to rotate around the circumference. The bottom end of the cleaning strip 43 is fixed with a cleaning brush, and the cleaning brush slides and contacts the filter plate 42, and then scrapes and cleans the filter plate 42 when the cleaning strip 43 rotates around the circumference, so as to prevent the filtered impurities from clogging the filter plate 42.

[0023] Example 3

[0024] Reference Figure 1-3 , which is the third embodiment of the utility model. This embodiment is based on the above two embodiments. When in use, the fan 6 draws exhaust gas from the intake pipe 7, and the exhaust gas passes through the U-shaped tube 5 into the pretreatment box 4 for treatment. The filter plate 42 filters the impurities in the exhaust gas. At the same time, the flow force of the exhaust gas after passing through the filter plate 42 drives the worm wheel blades 46 to rotate, and the worm wheel blades 46 drive the fixed transmission shaft 45 to rotate, and the transmission shaft 45 drives the fixed connecting ring 44 to rotate in a circle. The connecting ring 44 drives the fixed cleaning bar 43 to rotate in a circle. The bottom end of the cleaning bar 43 is fixed with a cleaning brush, and the cleaning brush slides and contacts the filter plate 42, and then scrapes and cleans the filter plate 42 when the cleaning bar 43 rotates in a circle to avoid the filtered impurities from clogging the filter plate 42. Then the exhaust gas enters the shell and tube heat exchanger 2 for condensation, and the ethylene glycol is collected after condensation, which reduces the waste of ethylene glycol. The U-shaped tube 5 is set to avoid reflux of ethylene glycol during condensation.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ethylene glycol tail gas recovery device, comprising a base (1), characterized in that: The top end of the base (1) is fixedly connected to the shell-and-tube heat exchanger (2), the top end of the shell-and-tube heat exchanger (2) is fixedly connected to one end of a connecting pipe (3), the middle of the connecting pipe (3) is fixedly connected to a pretreatment box (4), the other end of the connecting pipe (3) is fixedly connected to one end of a U-shaped tube (5), the other end of the U-shaped tube (5) is fixedly connected to a fan (6), and the fan (6) is fixedly connected to an air intake pipe (7).

2. The ethylene glycol tail gas recovery device according to claim 1, characterized in that: One end of the connecting pipe (3) away from the pretreatment box (4) is fixedly connected to a flange (31).

3. The ethylene glycol tail gas recovery device according to claim 1, characterized in that: The pretreatment box (4) comprises a cylinder (41), a filter plate (42), a cleaning strip (43), a connecting ring (44), a transmission shaft (45), a worm wheel blade (46), and a support frame (47). The two ends of the cylinder (41) are coaxially fixedly connected to the connecting pipe (3). The filter plate (42) is fixedly installed on the inner wall of one side of the cylinder (41) close to the U-shaped tube (5). The top end of the filter plate (42) is slidably abutted against a plurality of cleaning strips (43). One end of each of the cleaning strips (43) is fixedly A connecting ring (44) is fixedly connected, the connecting ring (44) is fixedly sleeved on one end of a transmission shaft (45), the transmission shaft (45) is rotatably connected to the filter plate (42), the other end of the transmission shaft (45) is rotatably connected to a support frame (47), the support frame (47) is fixedly connected to the inner wall of the cylinder (41), and a plurality of worm wheel blades (46) are fixedly connected to the middle part of the transmission shaft (45), and the worm wheel blades (46) are rotatably arranged between the filter plate (42) and the support frame (47).

4. The ethylene glycol tail gas recovery device according to claim 3, characterized in that: The cleaning strips (43) are evenly distributed around the circumference, and the transmission shaft (45) is coaxially arranged with the cylinder (41).

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