Alcohol-water separation tower of esterification system

Abstract

The invention discloses an esterification system alcohol-water separation tower, and belongs to the technical field of alcohol-water separation towers, the esterification system alcohol-water separation tower comprises a separation tower, the upper part of the separation tower is provided with a steam exhaust pipe, a deluge plate is arranged in the separation tower, the deluge plate is provided with deluge holes, the separation tower is provided with a feed pipe, a crushing mechanism is fixed at the bottom of the separation tower, and the crushing mechanism is provided with a rotating mechanism. A floating mechanism is arranged on the outer side of the rotating mechanism, a sliding way is arranged on the inner wall of the separating tower, one end of the floating mechanism is arranged in the sliding way in a sliding mode, an air inlet pipe penetrates through the separating tower, the bottom of the air inlet pipe is in a beveled shape, and the connecting pipe is movably communicated with the air inlet pipe in a matched mode. The heat exchange efficiency of the air and the mixed steam is guaranteed, timely separation of water vapor in the mixed steam and ethylene glycol steam is guaranteed, meanwhile, excessive reduction of the water content in the aqueous solution caused by excessive evaporation of water in the aqueous solution is avoided, and additional use of a power supply and increase of economic burden of an enterprise are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of alcohol-water separation towers, in particular to an alcohol-water separation tower for an esterification system. Background Art

[0002] In the esterification system, polyester reaction is an important process for producing polyester resin. After the esterification reaction, polyester resin, water and ethylene glycol aqueous solution and part of ethylene glycol steam and water vapor are produced. In order to reduce the water content of the aqueous solution, a separation tower is required to separate the water vapor in the mixed steam. Therefore, according to the different boiling points of ethylene glycol and water (ethylene glycol boiling point 197.3℃, water boiling point 100℃), the temperature of the mixed steam is reduced to between 100-197.3℃, then the ethylene glycol steam is cooled to liquid state and mixed in the aqueous solution, while the water vapor remains in gaseous state and is separated from the mixed steam. When the aqueous solution and the mixed steam enter the separation tower, the aqueous solution falls in the form of rain through the shower plate and contacts with the filtered natural air for heat exchange, so that both the aqueous solution and the mixed steam are cooled. After cooling, ethylene glycol becomes liquid and mixes with the aqueous solution and falls in the separation tower, while the water vapor is discharged from the separation tower. At the same time, the material pump removes the water solution in the separation tower. Liquid is extracted, however, due to the cooling of the aqueous solution, the polyester resin in the aqueous solution is prone to agglomeration. When the polyester resin in the aqueous solution agglomerates to a certain extent in the separation tower, the material pump will not pump liquid smoothly, the pumping flow rate will decrease, and the liquid level of the aqueous solution in the separation tower will gradually rise, which will reduce the contact distance between the air and the aqueous solution falling after rain and the mixed steam, reduce the heat exchange effect between the air and the mixed steam, and reduce the water vapor separation efficiency in the mixed steam. The prior art installs a motor at the bottom of the separation tower, installs a crushing cutter head in the separation tower, and drives the cutter head to rotate through the motor so that the cutter head crushes the agglomerated components in the aqueous solution. However, the motor drives the crushing cutter head to rotate all the time, so that the aqueous solution is always in a disturbed state, increasing the evaporation of water in the aqueous solution, resulting in too low water content in the aqueous solution, affecting the production of subsequent processes of the aqueous solution, and the separation tower is large in size, and the power consumption of the motor is also large, which increases the economic burden on the enterprise. Summary of the invention

[0003] In order to solve the technical problems mentioned in the above background technology, the present invention provides an alcohol-water separation tower for an esterification system, and the technical solution adopted is as follows:

[0004] It includes a separation tower, an exhaust pipe is arranged on the upper part of the separation tower, a shower plate is arranged in the separation tower, shower holes are arranged on the shower plate, a feed pipe is arranged on the separation tower, a discharge pipe is arranged at the bottom of the separation tower, a material pump is arranged on the discharge pipe, a pneumatic device is arranged on the lower side of the shower plate in the separation tower, the pneumatic device includes a crushing mechanism, a rotating mechanism and a floating mechanism, the crushing mechanism is fixed at the bottom of the separation tower, a rotating mechanism is arranged on the crushing mechanism, a floating mechanism is arranged on the outer side of the rotating mechanism, a slide is arranged on the inner wall of the separation tower, the upper and lower parts of the slide are closed structures, one end of the floating mechanism is slidably arranged in the slide, a connecting pipe is arranged at the tangent of the floating mechanism, the upper part of the connecting pipe is beveled, an air inlet pipe runs through the separation tower, the bottom of the air inlet pipe is beveled, and the connecting pipe is movably connected with the air inlet pipe.

[0005] Furthermore, the crushing mechanism includes a sealed bearing fixed at the bottom of the separation tower, a rotating shaft is arranged on the sealed bearing, a cutter head is arranged on the rotating shaft, and a blade is arranged on the cutter head.

[0006] Furthermore, the rotating mechanism includes a rotating rod fixed on the cutter head, and an impeller is arranged on the rotating rod.

[0007] Furthermore, the floating mechanism includes a sleeve arranged on the outside of the rotating rod and the impeller, a connecting pipe is arranged at the tangential part of the sleeve, a slide is arranged on the sleeve, one end of the slide is slidably arranged in the slideway, an air outlet part is arranged on the upper part of the sleeve, and a floating part is arranged at the bottom of the sleeve.

[0008] Furthermore, the air outlet component includes an air outlet arranged on the sleeve, a sealing cover is hinged on the air outlet, and an L-shaped limit block is arranged on the hinge point.

[0009] Furthermore, the floating member includes a slot fixed on the sleeve, and a buoy is inserted into the slot.

[0010] Furthermore, the float and the slot are fixed with bolts, and the bolts penetrate the float and the slot.

[0011] The present invention has the following advantages: when the amount of agglomerates in the aqueous solution in the separation tower increases gradually, the bottom of the separation tower becomes congested, and the flow rate of the aqueous solution extracted by the material pump becomes smaller, the amount of aqueous solution in the separation tower increases gradually, and the liquid level gradually rises. The floating mechanism floats up with the rise of the liquid level. When the connecting pipe on the floating mechanism is connected with the air inlet pipe, a sealed connection is formed with the air inlet pipe. At the same time, the connecting pipe cannot move up due to the position limitation of the air inlet pipe. The connecting pipe also limits the floating mechanism from moving up. The connecting pipe is just tangentially facing the rotating mechanism on the inner side of the floating mechanism. At this time, the air in the air inlet pipe is blown to the rotating mechanism through the connecting pipe. The rotating mechanism rotates, and the rotating mechanism drives the crushing mechanism to rotate. The crushing mechanism The agglomerated part in the aqueous solution in the separation tower is crushed to make the material pump unobstructed when extracting the aqueous solution, and then the liquid level of the aqueous solution drops, the floating mechanism drops along with the liquid level, the connecting pipe is separated from the air inlet pipe, and the air coming out of the air inlet pipe maintains a set contact distance with the mixed steam entering the feed pipe again. The present invention automatically controls the contact distance between the air and the mixed steam, which not only ensures the efficiency of the heat exchange between the air and the mixed steam, but also ensures the timely separation of the water vapor in the mixed steam from the ethylene glycol vapor, while avoiding excessive evaporation of water in the aqueous solution, resulting in excessive reduction of the water content in the aqueous solution, and also avoids the additional use of power, which increases the economic burden on the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of the pneumatic device of the present invention when it is not started;

[0013] Figure 2 For the present invention Figure 1 A partial enlarged view of point a in the middle;

[0014] Figure 3 For the present invention Figure 1 A partial enlarged view of point b in the middle;

[0015] Figure 4 For the present invention Figure 1 A partial enlarged view of point c in the middle;

[0016] Figure 5 A top view of the rain shower plate of the present invention;

[0017] Figure 6 A top view of the pneumatic device of the present invention;

[0018] Figure 7 For the present invention Figure 6 The local enlarged view at point d in the middle;

[0019] Figure 8 For the present invention Figure 6 The local enlarged view at e in the middle;

[0020] Fig. 9 This is a structural diagram of the pneumatic device of the present invention when it is started;

[0021] Fig.10 For the present invention Fig. 9 A partial enlarged view of point f in the middle.

[0022] Figure: 1 separation tower, 2 exhaust pipe, 3 shower plate, 4 shower hole, 5 feed pipe, 6 discharge pipe, 7 material pump, 8 slideway, 9 connecting pipe, 10 air inlet pipe, 11 sealed bearing, 12 rotating shaft, 13 cutter head, 14 blade, 15 rotating rod, 16 impeller, 17 sleeve, 18 slide plate, 19 slot, 20 float, 21 bolt, 22 air outlet, 23 sealing cover, 24 L-type limit block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides an alcohol-water separation tower for an esterification system, comprising a separation tower 1, wherein an exhaust pipe 2 is arranged at the upper part of the separation tower 1, and water vapor is discharged from the exhaust pipe 2, a shower plate 3 is arranged in the separation tower 1, and shower holes 4 are arranged on the shower plate 3, a feed pipe 5 is arranged on the separation tower 1, and an aqueous solution and mixed steam enter the separation tower 1 through the feed pipe 5, and the aqueous solution falls on the shower plate 3 and falls in the form of rain through the shower holes 4, a discharge pipe 6 is arranged at the bottom of the separation tower 1, and a material pump 7 is arranged on the discharge pipe 6, and the aqueous solution in the separation tower 1 is pumped out through the discharge pipe 6 and the material pump 7, and a pneumatic device is arranged at the lower side of the shower plate 3 in the separation tower 1, and the pneumatic device comprises a crushing mechanism, a rotating mechanism and a floating mechanism, and the crushing mechanism is fixed at the bottom of the separation tower A rotating mechanism is arranged on the crushing mechanism, a floating mechanism is arranged on the outside of the rotating mechanism, a slideway 8 is arranged on the inner wall of the separation tower 1, the upper and lower parts of the slideway 8 are closed structures, one end of the floating mechanism is slidably arranged in the slideway 8, so that the floating mechanism is limited when it slides up and down in the slide 8 to the highest point and the lowest point, a connecting pipe 9 is arranged at the tangential part of the floating mechanism, the upper part of the connecting pipe 9 is beveled, an air inlet pipe 10 passes through the separation tower 1, the bottom of the air inlet pipe 10 is beveled, the connecting pipe 9 is movably connected with the air inlet pipe 10, the upper part of the connecting pipe 9 is beveled and the bottom of the air inlet pipe 10 is beveled so that the connecting pipe 9 can be connected with the air inlet pipe 10 when it moves upward, and the air inlet pipe 10 limits the upper part of the connecting pipe 9.

[0025] The crushing mechanism includes a sealed bearing 11 fixed to the bottom of the separation tower 1, a rotating shaft 12 is arranged on the sealed bearing 11, a cutter head 13 is arranged on the rotating shaft 12, a blade 14 is arranged on the cutter head 13, when the cutter head 13 rotates, the blade 14 is driven to rotate, the blade 14 crushes the agglomerated part in the aqueous solution, and the cutter head 13 drives the rotating shaft 12 to rotate in the sealed bearing 11 at the same time, the rotating mechanism includes a rotating rod 15 fixed on the cutter head 13, the rotating rod 15 is provided with an impeller 16, when the impeller 16 rotates, the rotating rod 15 is driven to rotate, and the rotating rod 15 drives the cutter head 13 to rotate 5.

[0026] The floating mechanism includes a sleeve 17 arranged outside the rotating rod 15 and the impeller 16. The rotating rod 15 and the impeller 16 are arranged at the center of the inner side of the sleeve 17. A connecting pipe 9 is arranged at the tangential part of the sleeve 17. When air passes through the tangentially arranged connecting pipe 19, the air blows one side of the impeller 16 to drive the impeller 16 to rotate. A slide plate 18 is arranged on the sleeve 17. One end of the slide plate 18 is slidably arranged in the slideway 8. The slide plate 18 is limited by the highest point and the lowest point of the slideway 8. An air outlet is arranged on the upper part of the sleeve 17, and a floating The air outlet part includes an air outlet 22 arranged on the sleeve 17, a sealing cover 23 is hinged on the air outlet 22, and an L-shaped limit block 24 is arranged on the hinge point. When the connecting pipe 9 is connected with the air inlet pipe 10 to allow air to enter the sleeve 17, the air pushes open the hinged sealing cover 23, and the air goes out upward through the air outlet 22. The floating part includes a slot 19 fixed on the sleeve 17, a buoy 20 is inserted in the slot 19, and the buoy 20 and the slot 19 are fixed by bolts 21, and the bolts 21 pass through the buoy 20 and the slot 19.

[0027] Working principle of the present invention:

[0028] Please refer to Figure 1-8 The aqueous solution and mixed steam produced by the polyester reaction enter the separation tower 1 through the feed pipe 5, the aqueous solution falls on the shower plate 3 and falls through the shower hole 4 in the form of rain, the purified air enters the separation tower 1 through the air inlet pipe 10, and contacts with the aqueous solution and mixed steam in the shower by heat exchange, so that the aqueous solution and mixed steam are cooled, and at the same time, the aqueous solution in the separation tower 1 is pumped out through the discharge pipe 6 by the material pump 7, so that the liquid level of the aqueous solution in the separation tower 1 is always maintained at a certain position, at this time, the contact distance between the air in the separation tower 1 and the mixed steam above the liquid level of the aqueous solution is always maintained at a certain distance, the air contacts with the ethylene glycol steam and water vapor in the mixed steam, so that the ethylene glycol steam and the water vapor are cooled, wherein the temperature of the ethylene glycol steam after cooling is lower than the boiling point, the ethylene glycol steam becomes liquid and falls and mixes into the aqueous solution, while the temperature of the water vapor after cooling is moderately above the boiling point of water, it still exists in the form of steam, and is discharged through the exhaust pipe 2 along with the air.

[0029] Please refer to Figure 9-10As the aqueous solution cools down after contacting with the air, agglomeration components gradually appear in the aqueous solution, which gradually congests the separation tower 1. The material pump 7 is not smooth when pumping the aqueous solution, the flow rate becomes smaller, and the amount of aqueous solution pumped out per unit time becomes less. Therefore, the amount of aqueous solution in the separation tower 1 gradually increases, and the liquid level gradually increases. The liquid level drives the buoy 20 to rise, and the buoy 20 drives the sleeve 17 and the connecting pipe 9 to rise, and at the same time drives the slide plate 18 to slide up in the slideway 8. The slide plate 18 slides in the slideway 8 in a limited position, so that the sleeve 17 rises stably without deviation. When the inclined surface of the upper part of the connecting pipe 9 is aligned with the air inlet, the sleeve 17 is moved upward. When the bevel at the bottom of the pipe 10 is butted, the connecting pipe 9 forms a sealed connection with the air inlet pipe 10. At the same time, the air inlet pipe 10 limits the upper part of the connecting pipe 9, so that it cannot continue to rise, and the buoy 20 and the sleeve 17 cannot rise any more. At this time, the connecting pipe 9 is just tangentially facing the impeller 16, and the air enters the connecting pipe 9 through the air inlet pipe 10. The air in the connecting pipe 9 blows tangentially to the impeller 16, so that the impeller 16 rotates. The impeller 16 drives the rotating rod 15, the cutter head 13, the blade 14 and the rotating shaft 12 to rotate on the sealed bearing 11. The blade 14 removes the agglomerated part of the aqueous solution. The liquid is crushed, so that the material pump 7 becomes unobstructed when pumping the aqueous solution. During this process, the air in the sleeve 17 can only push up the sealing cover 23, so that the hinged sealing cover 23 is opened, and the air comes out upward through the air outlet 22. The sealing cover 23 is resisted by the L-shaped limit block 24 and can only be opened at a certain angle. Although the liquid level rises at this time, the contact distance between the air and the mixed steam becomes shorter, the air can still contact with the mixed steam to achieve heat exchange, but the heat exchange effect is not very good, and the water vapor separation efficiency is not high. However, this process lasts for a short time. As the agglomerated part of the aqueous solution is crushed, the material The pump 7 can quickly pump out the aqueous solution smoothly again, and the liquid level of the aqueous solution drops again. The float 20 drops with the liquid level, the sleeve 17 and the connecting pipe 9 also drop, and the connecting pipe 9 and the air inlet pipe 10 are separated. At this time, the sealing cover 23 loses the upper support of the air flow, and the sealing cover 23 is closed again under the action of gravity. The sealing cover 23 covers the air outlet 22 to prevent the aqueous solution from falling into the sleeve 17 when passing through the rain hole 4, causing siltation in the sleeve 17. When the sealing cover 23 is pushed open by the air flow, the high-pressure airflow simultaneously pushes open the aqueous solution falling from the rain, and the aqueous solution cannot enter the sleeve 17 either.

[0030] The present invention is simple to operate, convenient to use, and suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An alcohol-water separation tower for an esterification system, comprising a separation tower (1), wherein an exhaust pipe (2) is arranged at the top of the separation tower (1), a shower plate (3) is arranged inside the separation tower (1), a shower hole (4) is arranged on the shower plate (3), a feed pipe (5) is arranged on the separation tower (1), a discharge pipe (6) is arranged at the bottom of the separation tower (1), and a material pump (7) is arranged on the discharge pipe (6), characterized in that: A pneumatic device is arranged in the separation tower (1) below the shower plate (3), and the pneumatic device comprises a crushing mechanism, a rotating mechanism and a floating mechanism. The crushing mechanism is fixed at the bottom of the separation tower, a rotating mechanism is arranged on the crushing mechanism, and a floating mechanism is arranged outside the rotating mechanism. A slideway (8) is arranged on the inner wall of the separation tower (1), and the upper and lower parts of the slideway (8) are closed structures. One end of the floating mechanism is slidably arranged in the slideway (8), and a connecting pipe (9) is arranged at a tangent of the floating mechanism. The upper part of the connecting pipe (9) is beveled. An air inlet pipe (10) runs through the separation tower (1), and the bottom of the air inlet pipe (10) is beveled. The connecting pipe (9) is movably connected to the air inlet pipe (10).

2. The alcohol-water separation tower of the esterification system according to claim 1, characterized in that: The pulverizing mechanism comprises a sealed bearing (11) fixed to the bottom of the separation tower (1), a rotating shaft (12) is arranged on the sealed bearing (11), a cutter head (13) is arranged on the rotating shaft (12), and a blade (14) is arranged on the cutter head (13).

3. The alcohol-water separation tower of the esterification system according to claim 2, characterized in that: The rotating mechanism comprises a rotating rod (15) fixed on the cutter head (13), and an impeller (16) is arranged on the rotating rod (15).

4. The alcohol-water separation tower of the esterification system according to claim 1, characterized in that: The floating mechanism comprises a sleeve (17) arranged outside a rotating rod (15) and an impeller (16), a connecting pipe (9) is arranged at a tangential position of the sleeve (17), a slide plate (18) is arranged on the sleeve (17), one end of the slide plate (18) is slidably arranged in a slideway (8), an air outlet piece is arranged at the top of the sleeve (17), and a floating piece is arranged at the bottom of the sleeve (17).

5. The alcohol-water separation tower of the esterification system according to claim 4, characterized in that: The air outlet component comprises an air outlet (22) arranged on the sleeve (17), a sealing cover (23) is hinged on the air outlet (22), and an L-shaped limit block (24) is arranged on the hinge point.

6. The alcohol-water separation tower of the esterification system according to claim 4, characterized in that: The floating member comprises a slot (19) fixed on the sleeve (17), and a buoy (20) is inserted into the slot (19).

7. The alcohol-water separation tower of the esterification system according to claim 6, characterized in that: The buoy (20) and the slot (19) are fixed by bolts (21), and the bolts (21) penetrate the buoy (20) and the slot (19).

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