Scraper evaporator for ethylene glycol heavy fraction recovery

Abstract

The utility model provides a scraper evaporator for ethylene glycol heavy fraction recovery, which comprises an evaporator shell, a motor is fixedly arranged at the top of the evaporator shell through a rack, a main shaft is rotatably arranged in the evaporator shell, and the top end of the main shaft penetrates through the evaporator shell and is connected with the output end of the motor through a coupler. And a scraping plate is movably arranged on the surface of the main shaft through a traction mechanism. The traction mechanism is arranged between the main shaft and the scraping plate, and through the arrangement of the traction mechanism, the main shaft can drive the scraping plate to reciprocate in the vertical direction in the process of driving the scraping plate to revolve, so that the scraping direction of the scraping plate is increased when the scraping plate cleans the inner wall of an evaporator shell; the cleaning effect on the inner wall of the evaporator shell is improved, meanwhile, due to the arrangement of the two stirring mechanisms perpendicular to each other, raw materials in the evaporator shell can be stirred in two different directions, and the purpose of improving the recovery efficiency of ethylene glycol heavy fractions is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators for ethylene glycol, in particular to a scraper evaporator for recovering ethylene glycol heavy fraction. Background Technique

[0002] Ethylene glycol is an important chemical raw material and strategic material, which is used to manufacture polyester (which can be further processed into polyester fiber, beverage bottles, films), explosives, glyoxal, and can be used as antifreeze, plasticizer, hydraulic fluid and solvent, etc.;

[0003] The publication number "CN208493266U" provides a ethylene glycol wiped film evaporator, which includes a tank body. A rolling shaft is arranged at the central position in the vertical direction of the tank body; the rolling shaft is driven by a motor; a feed inlet and an exhaust pipe are arranged at the top of the tank body; the rolling shaft is connected with a stirring device through a plurality of brackets; a heating layer is arranged outside the tank body; a discharge port is arranged at the bottom of the tank body. This device can effectively evaporate water and does not affect the extraction of ethylene glycol. The scraper can simultaneously remove the crystals on the inner wall, effectively improving the processing efficiency and greatly reducing the cost;

[0004] However, the above-mentioned scheme and the existing technologies still have the following defects:

[0005] In the above-mentioned scheme and the existing technologies, the inner wall of the evaporator is cleaned by the revolution of the scraper, and at the same time, the scraper also plays a role in stirring the raw materials. However, since the scraper can only revolve, the cleaning direction inside the evaporator is relatively single, and the inner wall of the evaporator cannot be efficiently cleaned. Moreover, the stirring direction of the raw materials is also relatively single, thus reducing the recovery efficiency of ethylene glycol heavy fraction. Content of the Utility Model

[0006] The purpose of the utility model is to provide a scraper evaporator for recovering ethylene glycol heavy fraction, so as to solve the problems put forward in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical scheme:

[0008] A scraper evaporator for recovering ethylene glycol heavy fraction includes an evaporator housing. A motor is fixedly arranged at the top of the evaporator housing through a frame. A main shaft is rotatably arranged inside the evaporator housing. The top end of the main shaft penetrates through the evaporator housing and is connected with the output end of the motor through a coupling. A scraper is movably arranged on the surface of the main shaft through a traction mechanism;

[0009] The traction mechanism includes a receiving groove, a sleeve, a bracket, a traction part, a limiting block and a spring. The limiting block is fixedly arranged on the surface of the main shaft. The bracket is fixedly arranged on the surface of the sleeve. The scraper is fixedly arranged at one end of the bracket. The sleeve is slidably arranged on the surface of the main shaft through a guiding component. The spring is sleeved on the surface of the main shaft and fixedly arranged between the limiting block and the sleeve. The traction part is fixedly arranged at the top of the inner wall of the evaporator housing. The receiving groove is arranged at the bottom of the traction part.

[0010] Preferably, the guiding component includes a guiding block and a sliding groove. The sliding groove is arranged on the surface of the main shaft. The guiding block is fixedly arranged on the inner wall of the sleeve. The guiding block is slidably arranged in the sliding groove.

[0011] Preferably, two stirring mechanisms are arranged between the scraper and the main shaft. The stirring mechanism includes a rotating shaft and stirring blades. The rotating shaft is rotatably arranged between the two scrapers. The stirring blades are fixedly arranged on the surface of the rotating shaft. The rotating shaft is connected to the main shaft through a driving component.

[0012] Preferably, the driving component includes a through groove, a rack and a gear. The through groove is arranged on the surface of the main shaft. The rotating shaft penetrates through the inside of the through groove. The gear is fixedly arranged on the surface of the rotating shaft. The rack is fixedly arranged on the inner wall of the through groove. The gear meshes with the rack.

[0013] Preferably, there are three brackets. Each stirring mechanism is arranged between two adjacent brackets, and the two stirring mechanisms are perpendicular to each other.

[0014] Preferably, the joint of the receiving groove and the traction part is set to be a curved surface.

[0015] Preferably, the surface of the evaporator housing is provided with a material outlet, a first condensate outlet, a first steam inlet, a second condensate outlet, a second steam inlet, a third condensate outlet, a third steam inlet, a first material inlet, a second material inlet and a secondary steam inlet from bottom to top.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] A traction mechanism is arranged between the main shaft and the scraper in the present utility model. Through the arrangement of the traction mechanism, when the main shaft drives the scraper to revolve, the scraper can be driven to perform reciprocating motion in the vertical direction, which increases the scraping direction when the scraper cleans the inner wall of the evaporator housing, thereby improving the cleaning effect on the inner wall of the evaporator housing. At the same time, due to the arrangement of two mutually perpendicular stirring mechanisms, the raw materials inside the evaporator housing can be stirred from two different directions to achieve the purpose of improving the recovery efficiency of ethylene glycol heavy fraction. Description of the Drawings

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

[0019] Figure 2 is a schematic diagram of the connection structure between the main shaft and the scraper of the present utility model;

[0020] Figure 3 is a schematic diagram of the connection structure between the towing seat and the bracket of the present utility model;

[0021] Figure 4 is a schematic cross-sectional view of the casing of the present utility model;

[0022] Figure 5 is a schematic diagram of the connection structure between the rotating shaft and the main shaft of the present utility model;

[0023] Figure 6 is a schematic diagram of the connection structure between the guide block and the sliding groove of the present utility model.

[0024] In the figure: 1, evaporator housing; 2, bracket; 3, motor; 4, main shaft; 5, scraper; 6, receiving groove; 7, casing; 8, bracket; 9, towing part; 10, limiting block; 11, spring; 12, guide block; 13, sliding groove; 14, rotating shaft; 15, stirring blade; 16, through groove; 17, rack; 18, gear; 19, material outlet; 20, first condensate outlet; 21, first steam inlet; 22, second condensate outlet; 23, second steam inlet; 24, third condensate outlet; 25, third steam inlet; 26, first material inlet; 27, second material inlet; 28, secondary steam inlet. Detailed implementation manners

[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 of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figure 1-6 , the present utility model provides a technical solution:

[0027] Embodiment 1

[0028] A scraping evaporator for the recovery of ethylene glycol heavy fraction, comprising an evaporator housing 1. At the top of the evaporator housing 1, a motor 3 is fixedly arranged through a frame 2. Inside the evaporator housing 1, a main shaft 4 is rotatably arranged. The top end of the main shaft 4 penetrates through the evaporator housing 1 and is connected to the output end of the motor 3 through a coupling. On the surface of the main shaft 4, a scraper 5 is movably arranged through a traction mechanism. On the surface of the evaporator housing 1, a material outlet 19, a first condensate outlet 20, a first steam inlet 21, a second condensate outlet 22, a second steam inlet 23, a third condensate outlet 24, a third steam inlet 25, a first material inlet 26, a second material inlet 27 and a secondary steam inlet 28 are arranged from bottom to top;

[0029] The traction mechanism includes a receiving groove 6, a sleeve 7, a bracket 8, a traction part 9, a limiting block 10 and a spring 11. The limiting block 10 is fixedly arranged on the surface of the main shaft 4. The bracket 8 is fixedly arranged on the surface of the sleeve 7. The scraper 5 is fixedly arranged at one end of the bracket 8. The sleeve 7 is slidably arranged on the surface of the main shaft 4 through a guiding component. The spring 11 is sleeved on the surface of the main shaft 4 and is fixedly arranged between the limiting block 10 and the sleeve 7. The traction part 9 is fixedly arranged at the top of the inner wall of the evaporator housing 1. The receiving groove 6 is arranged at the bottom of the traction part 9. The joint of the receiving groove 6 and the traction part 9 is set as a curved surface.

[0030] Please refer to Figure 1 、 2 3 and 4, the main shaft 4 can drive the sleeve 7 to rotate synchronously through the guiding component, so that the sleeve 7 drives the scraper 5 to clean the inner wall of the evaporator housing 1 in a revolving manner. In this process, since the traction seat is also fixed on the inner wall of the evaporator housing 1, when the main shaft 4 drives the bracket 8 to rotate, the bracket 8 can rotate below the traction seat. Initially, the bracket 8 is located in the receiving groove 6. When the bracket 8 starts to rotate, the bracket 8 can move out of the receiving groove 6 through the curved surface and be extruded by the bottom of the traction seat. This extrusion force makes the bracket 8 drive the whole sleeve 7 to move downwards and cooperate with the limiting block 10 to compress the spring 11, so that the spring 11 stores energy. When the bracket 8 rotates 90° and re-enters the next receiving groove 6, at this time, under the action of the spring 11, the bracket 8 can be reset in the vertical height, so that the bracket 8 drives the scraper 5 to realize a movement process of first descending and then ascending.

[0031] The guiding component includes a guiding block 12 and a sliding groove 13. The sliding groove 13 is arranged on the surface of the main shaft 4. The guiding block 12 is fixedly arranged on the inner wall of the sleeve 7. The guiding block 12 is slidably arranged in the sliding groove 13.

[0032] Please refer to Figure 6, in order to ensure that there is no relative rotation between the sleeve 7 and the main shaft 4, a circumferential limit is imposed on the sleeve 7 on the surface of the main shaft 4 through a guiding assembly. When the sleeve 7 moves vertically, it can drive the guiding block 12 to move synchronously inside the sliding groove 13, and the circumferential limit of the sleeve 7 is achieved through the cooperation of the guiding block 12 and the sliding groove 13.

[0033] Embodiment 2

[0034] In the above embodiment, the vertical reciprocating motion of the scraper 5 during revolution is realized through the traction mechanism, thereby improving the cleaning efficiency of the inner wall of the evaporator housing 1. However, since the scraper 5 is arranged on one side close to the inner wall of the evaporator housing 1, it is difficult to stir the raw materials in the central area of the evaporator housing 1. Therefore, in this embodiment, two stirring mechanisms are arranged between the scraper 5 and the main shaft 4. The stirring mechanism includes a rotating shaft 14 and stirring blades 15. The rotating shaft 14 is rotatably arranged between the two scrapers 5, and the stirring blades 15 are fixedly arranged on the surface of the rotating shaft 14. The rotating shaft 14 is connected to the main shaft 4 through a driving assembly. The driving assembly includes a through groove 16, a rack 17 and a gear 18. The through groove 16 is arranged on the surface of the main shaft 4. The rotating shaft 14 penetrates through the inside of the through groove 16. The gear 18 is fixedly arranged on the surface of the rotating shaft 14. The rack 17 is fixedly arranged on the inner wall of the through groove 16. The gear 18 meshes with the rack 17. There are three brackets 8, and each stirring mechanism is arranged between two adjacent brackets 8, and the two stirring mechanisms are perpendicular to each other.

[0035] Please refer to Figure 5 , the scraper 5 can perform vertical reciprocating motion under the drive of the traction mechanism. However, the vertical height of the main shaft 4 is fixed. Therefore, the scraper 5 can drive the stirring blades 15 to perform vertical reciprocating motion synchronously through the rotating shaft 14, and the rotating shaft 14 can drive the gear 18 to move synchronously. When the gear 18 moves, it can drive the rotating shaft 14 to rotate through the cooperation with the fixed rack 17, so that the rotating shaft 14 drives the stirring blades 15 to rotate synchronously, and the raw materials are stirred by two groups of mutually perpendicular stirring blades 15.

[0036] Working principle: The motor 3 drives the main shaft 4 to rotate. The main shaft 4 drives the sleeve 7 to rotate synchronously through the guiding block 12 and the sliding groove 13, so that the sleeve 7 drives the scraper 5 to revolve through the bracket 8. During this process, through the cooperation of the spring 11, the limiting block 10, the receiving groove 6, the traction seat and the bracket 8, the sleeve 7 can drive the scraper 5 to perform vertical reciprocating motion during revolution, so as to improve the cleaning effect of the inner wall of the evaporator housing 1. During the vertical movement of the scraper 5, the stirring blades 15 can be driven to move synchronously through the rotating shaft 14, and through the through groove 16, the gear 18 and the rack 17, the stirring blades 15 can rotate during the vertical movement, so as to improve the stirring effect on the raw materials.

[0037] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A scraper evaporator for recovering heavy fraction of ethylene glycol, comprising an evaporator housing (1), characterized in that: A motor (3) is fixedly arranged on the top of the evaporator shell (1) via a frame (2); a main shaft (4) is rotatably arranged inside the evaporator shell (1); the top end of the main shaft (4) penetrates the evaporator shell (1) and is connected to the output end of the motor (3) via a coupling; a scraper (5) is movably arranged on the surface of the main shaft (4) via a traction mechanism; The traction mechanism comprises a receiving groove (6), a sleeve (7), a bracket (8), a traction part (9), a limit block (10) and a spring (11); the limit block (10) is fixedly arranged on the surface of the main shaft (4); the bracket (8) is fixedly arranged on the surface of the sleeve (7); the scraper (5) is fixedly arranged on one end of the bracket (8); the sleeve (7) is slidably arranged on the surface of the main shaft (4) through a guide assembly; the spring (11) is sleeved on the surface of the main shaft (4) and fixedly arranged between the limit block (10) and the sleeve (7); the traction part (9) is fixedly arranged on the top of the inner wall of the evaporator shell (1); and the receiving groove (6) is arranged at the bottom of the traction part (9).

2. The scraper evaporator for recovering heavy fraction of ethylene glycol according to claim 1, characterized in that: The guide assembly comprises a guide block (12) and a slide groove (13); the slide groove (13) is arranged on the surface of the main shaft (4); the guide block (12) is fixedly arranged on the inner wall of the sleeve (7); and the guide block (12) is slidably arranged in the slide groove (13).

3. The scraper evaporator for recovering heavy fraction of ethylene glycol according to claim 1, characterized in that: Two stirring mechanisms are arranged between the scraper (5) and the main shaft (4), and the stirring mechanisms include a rotating shaft (14) and a stirring blade (15). The rotating shaft (14) is rotatably arranged between the two scrapers (5), and the stirring blade (15) is fixedly arranged on the surface of the rotating shaft (14). The rotating shaft (14) is connected to the main shaft (4) through a driving component.

4. The scraper evaporator for recovering heavy fraction of ethylene glycol according to claim 3, characterized in that: The driving assembly comprises a through slot (16), a rack (17) and a gear (18); the through slot (16) is arranged on the surface of the main shaft (4); the rotating shaft (14) passes through the interior of the through slot (16); the gear (18) is fixedly arranged on the surface of the rotating shaft (14); the rack (17) is fixedly arranged on the inner wall of the through slot (16); and the gear (18) and the rack (17) are meshed with each other.

5. The scraper evaporator for recovering heavy fraction of ethylene glycol according to claim 4, characterized in that: Three brackets (8) are provided, and each stirring mechanism is provided between two adjacent brackets (8), and the two stirring mechanisms are perpendicular to each other.

6. The scraper evaporator for recovering heavy fraction of ethylene glycol according to claim 1, characterized in that: The containing groove (6) is arranged as a curved surface at the joint of the traction portion (9).

7. The scraper evaporator for recovering heavy fraction of ethylene glycol according to claim 1, characterized in that: The surface of the evaporator shell (1) is provided with a material outlet (19), a first condensed water outlet (20), a first water vapor inlet (21), a second condensed water outlet (22), a second water vapor inlet (23), a third condensed water outlet (24), a third water vapor inlet (25), a first material inlet (26), a second material inlet (27) and a secondary steam inlet (28) from bottom to top.

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