A tail gas purification treatment system for dichlorophenol production

Abstract

The invention belongs to the technical field of tail gas treatment, and specifically relates to a tail gas purification treatment system for dichlorophenol production, comprising a falling film absorber, wherein the falling film absorber also comprises a tube body, an absorption tube and a controller; two upper and lower mounting plates are fixedly mounted on the inner wall of the tube body, and the mounting plates are used to fix the absorption tube; an air inlet is arranged at one end of the tube body, a liquid discharge port is arranged at the other end, and a washing liquid port, a water inlet, a water outlet and an exhaust port are arranged in sequence on the outer wall of the tube body between the air inlet and the liquid discharge port; the invention arranges a scraper so that the scraper can scrape off the scale condensed on the outer wall of the absorption tube to avoid the accumulation of scale on the outer wall of the absorption tube, on the one hand, reduces the absorption of heat transferred by cooling water to the absorption tube, thereby avoiding the temperature increase in the absorption tube, and improving the absorption effect of the absorption liquid on the hydrochloric acid tail gas, and on the other hand, facilitates the staff to clean the scale in the absorption tube, thereby reducing the labor intensity of the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a tail gas purification treatment system for dichlorophenol production. Background Art

[0002] Dichlorophenol is mainly used for the synthesis of pesticides. Its production method is to pump a certain amount of phenol into a chlorination reactor. After the liquid chlorine is heated and vaporized by hot water, a certain amount is controlled by a flow meter to pass into the reactor. The reaction temperature is controlled to carry out the chlorination reaction, thereby obtaining dichlorophenol. The hydrogen chloride and unreacted chlorine tail gas produced by the chlorination reaction are condensed at low temperature and the entrained phenols are captured by the washing process, and then sent to the distillation device for separation and recovery. The remaining tail gas is then absorbed by a multi-stage falling film absorber. The hydrochloric acid in it is then passed into a packed tower for absorption and purification.

[0003] For example, a Chinese patent with application number CN201220542985.7 discloses a falling film absorber. This technical solution, through the arrangement of a cooling water inlet and a cooling water outlet, generates a large amount of heat in the process of falling film absorption of the absorption liquid and transmits it outward through the tube wall of the absorption tube. The cooling water flows from the cooling water inlet from bottom to top in the inner cavity of the absorption section to the cooling water outlet, taking away the heat on the outer wall of the absorption tube, thereby achieving the advantages of good cooling effect of the falling film absorber, good film forming property and absorption effect of the absorption liquid, and the equipment is not easy to be damaged, and the falling film absorber has a long service life. However, this technology The solution does not completely solve the problem that when the absorption tubes in the falling film absorber absorb hydrochloric acid tail gas, the hydrochloric acid releases heat on the inner wall of the absorption tubes, and the heat generated is transferred by the absorption tubes. In the process of cooling the absorption tubes by the cooling water, the scale in the cooling water will condense on the outer wall of the absorption tubes, which will weaken the heat transfer effect of the absorption tubes, thereby increasing the temperature in the absorption tubes, weakening the absorption effect of the hydrochloric acid tail gas by the absorption liquid, and the scale condenses on the outer wall of the absorption tubes, making it more difficult for the staff to clean the scale, and increasing the labor intensity of the staff, which leads to the limitations of the technical solution.

[0004] In view of this, in order to overcome the above technical problems, the present invention proposes a tail gas purification treatment system for dichlorophenol production, which solves the above technical problems. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a tail gas purification treatment system for dichlorophenol production. Through the arrangement of a scraper, the scraper can scrape off the scale condensed on the outer wall of the absorption tube to avoid the accumulation of scale on the outer wall of the absorption tube. On the one hand, the absorption of heat transferred by the absorption tube by cooling water is reduced, thereby avoiding the temperature increase in the absorption tube and improving the absorption effect of the absorption liquid on the hydrochloric acid tail gas. On the other hand, it is convenient for the staff to clean the scale in the absorption tube and reduce the labor intensity of the staff.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the tail gas purification treatment system of dichlorophenol production described in the present invention comprises a falling film absorber, and the falling film absorber also comprises a tube body, an absorption tube array and a controller; two upper and lower mounting plates are fixedly installed on the inner wall of the tube body, and the mounting plates are used to fix the absorption tube array; an air inlet is opened at one end of the tube body, and a liquid discharge port is opened at the other end; a washing liquid port, a water inlet, a water outlet and an exhaust port are opened in sequence on the outer wall of the tube body between the air inlet and the liquid discharge port; the water inlet and the water outlet are fixedly installed on the inner wall of the tube body, and the upper and lower mounting plates are fixedly installed on the inner wall of the tube body, and the upper and lower mounting plates are used to fix the absorption tube array; an air inlet is opened at one end of the tube body, and a liquid discharge port is opened at the other end; a washing liquid port, a water inlet, a water outlet and The washing liquid port is located between the air inlet and the absorption tube array; a gear is rotatably connected to the mounting plate below the tube body, and a screw is rotatably sealed and connected to the inner wall of the tube body, and the screw is meshed with the gear; a driving motor is fixedly connected to the outer wall of the tube body, and the output end of the driving motor is fixedly connected to one end of the screw; a screw is fixedly connected to the center of the gear, and a scraper is provided on the gear, and the scraper is threadedly connected to the screw, and a through hole is opened in the scraper; the absorption tube array is slidably sealed and connected in the through hole; the controller is used to control the automatic operation of the entire falling film absorber;

[0007] In the prior art, when the absorption tubes in the falling film absorber absorb hydrochloric acid tail gas, the hydrochloric acid releases heat, so that the generated heat is transferred by the absorption tubes, so that in the process of cooling the absorption tubes by the cooling water, the scale in the cooling water will condense on the outer wall of the absorption tubes, so that the heat transfer effect of the absorption tubes is weakened, thereby increasing the temperature in the absorption tubes, weakening the absorption effect of the absorption liquid on the hydrochloric acid tail gas, and the scale condenses on the outer wall of the absorption tubes, making it more difficult for the staff to clean the scale, and increasing the labor intensity of the staff;

[0008] During operation, the staff controls the absorption liquid to enter from the washing liquid port through the controller, so that the absorption liquid overflows the port of the absorption tube and flows down along the inner wall of the absorption tube. At this time, the hydrochloric acid tail gas is controlled to enter the tube body from the air inlet, so that the hydrochloric acid tail gas enters the absorption tube and is absorbed by the absorption liquid on the inner wall of the absorption tube, so that the hydrochloric acid tail gas releases heat on the inner wall of the absorption tube. At this time, the controller controls the cooling water to enter from the water inlet and fill the space between the two mounting plates, so that the cooling water cools the absorption tube, and when the cooling water fills the space between the two mounting plates, the water outlet is opened to allow the cooling water to flow out from the water outlet, so that the water flow between the two mounting plates remains at a uniform speed, and when the absorption liquid flows out from the lower end of the absorption tube, the absorption liquid and the hydrochloric acid therein are discharged from the drain port, and the hydrochloric acid tail gas that has not been absorbed is discharged from the exhaust port and proceeds to the next step of treatment. The absorption liquid in the tube absorbs the hydrochloric acid tail gas, and scale condenses continuously on the outer wall of the absorption tube. When it is necessary to clean the scale on the outer wall of the absorption tube, the staff controls the falling film absorber to stop through the controller, so that the cooling water completely flows out from the water outlet. At this time, the controller controls the driving motor to rotate, so that the driving motor drives the gear and the screw to rotate synchronously through the lead screw, so that the scraper slides upward along the inner wall of the tube body, and the scraper slides upward along the absorption tube, so that the scale on the outer wall of the absorption tube is separated from the outer wall of the absorption tube under the scraping of the through-hole side wall. When the scraper contacts the upper mounting plate, the controller controls the driving motor to reverse, so that the driving motor drives the gear and the screw to rotate in the opposite direction, so that the scraper is reset. At this time, the controller controls the falling film absorber to operate, so that the cooling water enters from the water inlet, so that the scale above the scraper flows out from the water outlet with the cooling water;

[0009] The scraper is arranged in the present invention so that the scraper can scrape off the scale condensed on the outer wall of the absorption tube to avoid the accumulation of scale on the outer wall of the absorption tube. On the one hand, the absorption of heat transferred by the absorption tube by cooling water is reduced, thereby avoiding the temperature increase in the absorption tube and improving the absorption effect of the absorption liquid on the hydrochloric acid tail gas. On the other hand, it is convenient for the staff to clean the scale in the absorption tube and reduce the labor intensity of the staff.

[0010] Preferably, a sealed bearing is fixedly installed in the through hole; a spiral groove is provided on the outer wall of the absorption tube; a slider is fixedly connected to the inner ring of the sealed bearing; the slider is slidably and sealedly connected to the spiral groove; during operation, when the scraper moves upward, the sealed bearing in the scraper moves upward driven by the scraper, so that the sealed bearing drives the slider to slide along the spiral groove, and the sealed bearing drives the slider to rotate upward along the spiral groove, so that the sealed bearing rotates and scrapes the scale on the outer wall of the absorption tube, and in the process of the slider sliding along the spiral groove, the slider can scrape off the scale condensed in the slide groove, and when the sealed bearing rotates and rubs the harder scale condensed on the outer wall of the absorption tube, the hard scale is broken under the rotational friction of the sealed bearing, so that the sealed bearing will be broken and adhere to the outer wall of the absorption tube. The scale is scraped off, and damage to the sealed bearing caused by the impact of translational cutting between the sealed bearing and the scale is avoided, thereby increasing the service life of the sealed bearing; and the rotation of the sealed bearing can drive the water flow at its position to rotate, so that the water flow above the sealed bearing rotates, so that the water flow impacts the scale cut by the sealed bearing, and accelerates the scale to separate from the outer wall of the absorption tube. The sealed bearing rotates, so that the water flow drives the scale scraped off the upper end of the sealed bearing to rotate, so that the scraped scale is away from the absorption tube under the centrifugal rotation of the water flow, avoiding excessive accumulation of scale on the sealed bearing, and preventing the sealed bearing from being unable to scrape the scale on the outer wall of the upper absorption tube due to the obstruction of the scale, thereby improving the cleaning effect of the scraper on the overall absorption tube, so that the practical application effect of the present invention is improved.

[0011] Preferably, a brush plate is provided above the sealed bearing; an arc-shaped inclined groove and a groove are provided at the lower end of the brush plate; the arc-shaped inclined groove is communicated with the groove; a sliding block is slidably connected in the arc-shaped inclined groove; the sliding block is fixedly connected to the sealed bearing; a support spring is fixedly connected to the side wall of the groove, and a compression spring is fixedly connected to the bottom of the groove; a push plate is fixedly connected to the end of the support spring close to the sliding block; the push plate is in sliding contact with the sliding block; during operation, when the sealed bearing rotates, the brush plate rotates synchronously driven by the sealed bearing, so that the brush plate can push the water flow to rotate, so that the water flow is directed toward Flowing in the same direction increases the rotation effect of the water flow, which improves the flushing effect on the scale on the surface of the absorbent tube, thereby accelerating the shedding of the scale. As the brush plate rotates, the end of the brush plate close to the absorbent tube can first scrape the scale on the surface of the absorbent tube, so that the thicker scale condensed on the outer wall of the absorbent tube is scraped off by the brush plate, and its thickness is reduced. The scale with reduced thickness is then scraped off by the sealed bearing, so that the scraping effect of the sealed bearing on the scale on the outer wall of the absorbent tube is improved. When the brush plate rises under the drive of the scraper and contacts the mounting plate, the brush plate The sliding block is pressed down by the mounting plate, so that the sliding block slides along the arc surface of the arc-shaped inclined groove, so that the sliding block slides toward the groove direction by compressing the support spring through the push plate. When the sliding block slides to the notch of the groove, the end of the brush plate close to the absorption tube is pressed against the absorption tube. As the sealed bearing continues to rotate and rise, the sealed bearing pushes the sliding block to compress the compression spring into the groove, and the sliding block drives the brush plate to rotate along the outer wall of the absorption tube, so that the brush plate scrapes off the scale on the upper end of the absorption tube, thereby greatly reducing the scale condensed on the outer wall of the absorption tube. The setting enables the brush plate to thin the scale condensed on the outer wall of the absorption tube, making it easier for the sealed bearing to clean the scale condensed on the outer wall of the absorption tube. This not only improves the cleaning effect of the sealed bearing on the scale, but also reduces the area of ​​rotational cutting between the sealed bearing and the scale, thereby reducing the wear of the sealed bearing and increasing the service life of the sealed bearing. The cooperation between the brush plate and the sliding block enables the brush plate to scrape off the scale on the surface of the absorption tube near the upper mounting plate, thereby reducing the scale content condensed on the surface of the absorption tube, thereby improving the practicality of the present invention.

[0012] Preferably, a circular hole is provided on the upper end of the scraper, and a filter screen is fixedly installed at one end of the circular hole away from the drain port, and the filter screen is fixedly connected to the filter cloth; when working, when it is necessary to clean the scale on the inner wall of the absorption tube, there is no need to close the falling film absorber. At this time, the staff directly controls the driving motor to rotate through the controller, so that the scraper rises under the drive of the driving motor. At this time, the condensed water above the scraper flows through the circular hole to between the lower mounting plate and the scraper, and flows out from the water outlet. At this time, the condensed water between the two mounting plates is in a balanced flow state; the heat generated by the friction between the screw rod and the gear immersed in the condensed water is absorbed by the condensed water, reducing the generation of friction heat between the screw rod and the gear. The scale generated by the scraper can reduce the wear between the screw and the gear, thereby increasing the service life of the screw and the gear. Due to the setting of the filter cloth, the scale scraped off by the scraper cannot enter between the lower mounting plate and the scraper through the round hole, avoiding the scale from sinking to the meshing point of the screw and the gear and damaging the transmission screw and gear. The setting of the filter screen allows the filter screen to support the filter cloth, thereby increasing the service life of the filter cloth, and the scale generation speed is slow. Only during the short time when the scraper rises and falls, there is no obvious scale condensation on the surface of the absorption tube. Therefore, when the scraper descends, no scale on the surface of the absorption tube is scraped off by the scraper, ensuring that there is no scale residue between the lower mounting plate and the scraper.

[0013] Preferably, a slide groove is provided on the inner wall of the shell; a limit block is connected to the slide groove in a sliding seal; the limit block is fixedly connected to the scraper; during operation, for different falling film absorbers, the materials of the absorber tubes used are different, so the firmness of the absorber tubes is also different. When the driving motor drives the gear to rotate through the screw, the gear drives the screw to rotate, so that the screw drives the scraper to generate a rotation trend, and the scraper drives the limit block to generate a rotation trend, but the limit block is limited in the slide groove, so that the limit block cannot rotate, so that the limit block drives the scraper to slide upward along the slide groove; because when the scraper has a rotation trend, the scraper only relies on the support of the absorber tube, so that the scraper cannot rotate and rises Therefore, when the absorbent tubes are used for too long, the outer walls of the absorbent tubes will be corroded by scale, which will weaken the strength of some parts of the absorbent tubes. When the scraper moves to the corroded area of ​​the absorbent tubes, the absorbent tubes at this location cannot withstand the twisting of the scraper and are damaged. Therefore, the present invention uses the cooperation of the limit block and the slide groove to enable the limit block to limit the scraper, thereby avoiding the rotation tendency of the scraper, so that the scraper generates a twisting force on the absorbent tubes, which not only prevents the absorbent tubes from being damaged by the twisting of the scraper, thereby improving the service life of the absorbent tubes, but also ensures that the scraper can be used on absorbent tubes of various materials, thereby improving the application range of the scraper, and effectively improving the actual use effect of the present invention.

[0014] Preferably, an airway is opened in the tube body; one end of the airway is connected to the water inlet, and the other end is connected to the chute; during operation, when the scraper rises and scrapes the scale on the surface of the absorption tube, the scale scraped off by the scraper will be spread on the upper end of the scraper driven by the brush plate, so that part of the scale will enter the chute and accumulate on the limit block. As the condensed water enters from the water inlet, part of the condensed water flows into the airway, so that the condensed water in the airway is sprayed out from the chute. When the limit block moves to the airway, the condensed water sprayed through the airway can disperse the accumulated scale on the limit block, so that there is no scale residue on the limit block, so that the practical application effect of the present invention is further improved.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The scraper of the present invention is arranged so that the scraper can scrape off the scale condensed on the outer wall of the absorption tube to avoid the accumulation of scale on the outer wall of the absorption tube. On the one hand, it reduces the absorption of heat transferred by the absorption tube by cooling water, thereby avoiding the temperature increase in the absorption tube and improving the absorption effect of the absorption liquid on the hydrochloric acid tail gas. On the other hand, it is convenient for the staff to clean the scale in the absorption tube and reduce the labor intensity of the staff.

[0017] 2. The present invention sets a brush plate so that the brush plate can thin the scale condensed on the outer wall of the absorption tube, making it easier for the sealed bearing to clean the scale condensed on the outer wall of the absorption tube. This not only improves the cleaning effect of the sealed bearing on the scale, but also reduces the area of ​​rotational cutting between the sealed bearing and the scale, thereby reducing the wear of the sealed bearing and increasing the service life of the sealed bearing. The cooperation between the brush plate and the sliding block enables the brush plate to scrape off the scale on the surface of the absorption tube near the upper mounting plate, thereby reducing the content of scale condensed on the surface of the absorption tube, thereby improving the practicability of the present invention.

[0018] 3. The present invention cooperates with the limit block and the slide groove so that the limit block limits the scraper, avoiding the rotation tendency of the scraper, so that the scraper generates a torsional force on the absorption tubes, which not only prevents the absorption tubes from being damaged by the torsion of the scraper, thereby improving the service life of the absorption tubes, but also ensures that the scraper can be used for absorption tubes of various materials, thereby improving the application range of the scraper and effectively improving the actual use effect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0020] Figure 1 is a stereogram of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the present invention;

[0022] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0023] Figure 4 yes Figure 2 Sectional view at the middle BB;

[0024] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0025] Figure 6 yes Figure 2 The enlarged view of point D in the middle;

[0026] Figure 7 yes Figure 2 Sectional view at EE;

[0027] Figure 8 It is a structural schematic diagram of the brush plate in the present invention;

[0028] In the figure: 1. tube body; 11. air inlet; 12. liquid discharge port; 13. washing liquid port; 14. water inlet; 15. water outlet; 16. exhaust port; 17. slideway; 18. airway; 2. absorption tube; 21. spiral groove; 3. mounting plate; 31. gear; 32. lead screw; 33. drive motor; 34. screw; 35. scraper; 351. through hole; 352. round hole; 353. filter screen; 354. filter cloth; 36. sealing bearing; 361. slider; 37. limit block; 4. brush plate; 41. arc-shaped inclined groove; 42. groove; 43. sliding block; 44. compression spring; 45. support spring; 46. push plate. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0030] like Figures 1 to 8As shown, a tail gas purification treatment system for dichlorophenol production described in the present invention includes a falling film absorber, which also includes a tube body 1, an absorption tube array 2 and a controller; the inner wall of the tube body 1 is fixedly installed with two upper and lower mounting plates 3, and the mounting plates 3 are used to fix the absorption tube array 2; an air inlet 11 is opened at one end of the tube body 1, and a liquid discharge port 12 is opened at the other end; a washing liquid port 13, a water inlet 14, a water outlet 15 and an exhaust port 16 are opened in sequence on the outer wall of the tube body 1 between the air inlet 11 and the liquid discharge port 12; the water inlet 14 is connected to the water outlet 15; the washing liquid port 13 is located at the air inlet 1 1 and the absorber tube 2; a gear 31 is rotatably connected to the mounting plate 3 below the tube body 1, a screw 32 is rotatably and sealably connected to the inner wall of the tube body 1, and the screw 32 is meshed with the gear 31; a driving motor 33 is fixedly connected to the outer wall of the tube body 1, and the output end of the driving motor 33 is fixedly connected to one end of the screw 32; a screw 34 is fixedly connected to the center of the gear 31, a scraper 35 is provided on the gear 31, and the scraper 35 is threadedly connected to the screw 34, and a through hole 351 is opened in the scraper 35; the absorber tube 2 is slidably and sealably connected in the through hole 351; the controller is used to control the automatic operation of the entire falling film absorber;

[0031] In the prior art, when the absorption tubes 2 in the falling film absorber absorb the hydrochloric acid tail gas, the hydrochloric acid releases heat, so that the generated heat is transferred by the absorption tubes 2, so that in the process of cooling the absorption tubes 2 by the cooling water, the scale in the cooling water will condense on the outer wall of the absorption tubes 2, so that the heat transfer effect of the absorption tubes 2 is weakened, thereby increasing the temperature in the absorption tubes 2, weakening the absorption effect of the absorption liquid on the hydrochloric acid tail gas, and the scale condenses on the outer wall of the absorption tubes 2, making it more difficult for the staff to clean the scale, and increasing the labor intensity of the staff;

[0032] During operation, the staff controls the absorption liquid to enter from the washing liquid port 13 through the controller, so that the absorption liquid overflows the port of the absorption tube 2 and flows down along the inner wall of the absorption tube 2. At this time, the hydrochloric acid tail gas is controlled to enter the tube body 1 from the air inlet 11, so that the hydrochloric acid tail gas enters the absorption tube 2 and is absorbed by the absorption liquid on the inner wall of the absorption tube 2, so that the hydrochloric acid tail gas releases heat on the inner wall of the absorption tube 2. At this time, the controller controls the cooling water to enter from the water inlet 14 and fill the space between the two mounting plates 3, so that the cooling water cools the absorption tube 2, and when the cooling water fills the space between the two mounting plates 3, the water outlet 15 is opened, so that the cooling water flows out from the water outlet 15, so that the water flow between the two mounting plates 3 maintains a uniform speed, and when the absorption liquid flows out from the lower end of the absorption tube 2, the absorption liquid and the hydrochloric acid therein are discharged from the drain port 12, and the hydrochloric acid tail gas that has not been absorbed is discharged from the exhaust port 16 and is processed in the next step. As the absorption liquid in the absorption tube 2 cools the hydrochloric acid The tail gas is absorbed, and scale is continuously condensed on the outer wall of the absorption tube 2. When it is necessary to clean the scale on the outer wall of the absorption tube 2, the staff controls the falling film absorber to stop through the controller, so that the cooling water completely flows out from the water outlet 15. At this time, the controller controls the driving motor 33 to rotate, so that the driving motor 33 drives the gear 31 and the screw 34 to rotate synchronously through the screw 32, so that the scraper 35 slides upward along the inner wall of the tube body 1, so that the scraper 35 slides upward along the absorption tube 2, so that the scale on the outer wall of the absorption tube 2 is separated from the outer wall of the absorption tube 2 under the scraping of the side wall of the through hole 351. When the scraper 35 contacts the upper mounting plate 3, the controller controls the driving motor 33 to reverse, so that the driving motor 33 drives the gear 31 and the screw 34 to rotate in the opposite direction, so that the scraper 35 is reset. At this time, the controller controls the falling film absorber to operate, so that the cooling water enters from the water inlet 14, so that the scale above the scraper 35 flows out from the water outlet 15 with the cooling water;

[0033] The scraper 35 of the present invention is arranged so that the scraper 35 can scrape off the scale condensed on the outer wall of the absorption tube 2 to avoid the accumulation of scale on the outer wall of the absorption tube 2. On the one hand, it reduces the absorption of heat transferred by the absorption tube 2 by the cooling water, thereby avoiding the temperature increase in the absorption tube 2 and improving the absorption effect of the absorption liquid on the hydrochloric acid tail gas. On the other hand, it is convenient for the staff to clean the scale in the absorption tube 2 and reduce the labor intensity of the staff.

[0034] As an embodiment of the present invention, a sealed bearing 36 is fixedly installed in the through hole 351; a spiral groove 21 is opened on the outer wall of the absorption tube 2; a slider 361 is fixedly connected to the inner ring of the sealed bearing 36; the slider 361 is slidably and sealedly connected to the spiral groove 21; during operation, when the scraper 35 moves upward, the sealed bearing 36 in the scraper 35 moves upward under the drive of the scraper 35, so that the sealed bearing 36 drives the slider 361 to slide along the spiral groove 21, so that the sealed bearing 36 drives the slider 361 to rotate upward along the spiral groove 21, so that the sealed bearing 36 rotates and scrapes the scale on the outer wall of the absorption tube 2, and when the slider 361 slides along the spiral groove 21, the slider 361 can scrape off the scale condensed in the slide groove 17, and when the sealed bearing 36 rotates and rubs the harder scale condensed on the outer wall of the absorption tube 2, the hard scale is broken under the rotational friction of the sealed bearing 36, so that The sealed bearing 36 can scrape off the scale that is broken and adhered to the outer wall of the absorption tube 2, thereby avoiding damage to the sealed bearing 36 caused by the impact of translational cutting between the sealed bearing 36 and the scale, thereby increasing the service life of the sealed bearing 36; and the rotation of the sealed bearing 36 can drive the water flow at its position to rotate, so that the water flow above the sealed bearing 36 rotates, so that the water flow impacts the scale cut by the sealed bearing 36, accelerates the scale to separate from the outer wall of the absorption tube 2, and the sealed bearing 36 rotates, so that the water flow drives the scale scraped off the upper end of the sealed bearing 36 to rotate, so that the scraped scale is away from the absorption tube 2 under the centrifugal rotation of the water flow, avoiding the scale from accumulating too high on the sealed bearing 36, and preventing the sealed bearing 36 from being unable to scrape the scale on the outer wall of the upper absorption tube 2 due to the obstruction of the scale, thereby improving the cleaning effect of the scraper 35 on the absorption tube 2 as a whole, so that the practical application effect of the present invention is improved.

[0035] As an embodiment of the present invention, a brush plate 4 is provided above the sealing bearing 36; an arc-shaped inclined groove 41 and a groove 42 are provided at the lower end of the brush plate 4; the arc-shaped inclined groove 41 is communicated with the groove 42; a sliding block 43 is slidably connected in the arc-shaped inclined groove 41; the sliding block 43 is fixedly connected to the sealing bearing 36; a support spring 45 is fixedly connected to the side wall of the groove 42, and a compression spring 44 is fixedly connected to the bottom of the groove 42; a push plate 46 is fixedly connected to the end of the support spring 45 close to the sliding block 43; the push plate 46 is in sliding contact with the sliding block 43; during operation, when the sealing bearing 36 rotates, the brush plate 4 rotates synchronously driven by the sealing bearing 36 The brush plate 4 moves so that the brush plate 4 can push the water flow to rotate, so that the water flow flows in the same direction, so that the rotation effect of the water flow is increased, so that the flushing effect of the scale on the surface of the absorbent tube 2 is improved, thereby accelerating the shedding of the scale. As the brush plate 4 rotates, the end of the brush plate 4 close to the absorbent tube 2 can first scrape the scale on the surface of the absorbent tube 2, so that the thicker scale condensed on the outer wall of the absorbent tube 2 is scraped off by the brush plate 4, and its thickness is reduced, so that the scale with reduced thickness is scraped off by the sealing bearing 36, so that the scraping effect of the sealing bearing 36 on the scale on the outer wall of the absorbent tube 2 is improved. When the brush plate 4 rises under the drive of the scraper 35 and contacts the mounting plate 3 When the brush plate 4 is touched, the brush plate 4 is pressed down by the mounting plate 3, so that the sliding block 43 slides along the arc surface of the arc-shaped inclined groove 41, so that the sliding block 43 slides in the direction of the groove 42 by compressing the support spring 45 through the push plate 46. When the sliding block 43 slides to the notch of the groove 42, the end of the brush plate 4 close to the absorption tube 2 is pressed against the absorption tube 2. As the sealing bearing 36 continues to rotate and rise, the sealing bearing 36 pushes the sliding block 43 to squeeze the compression spring 44 and enter the groove 42. At the same time, the sliding block 43 drives the brush plate 4 to rotate along the outer wall of the absorption tube 2, so that the brush plate 4 scrapes off the scale on the upper end of the absorption tube 2, so that the scale condensed on the outer wall of the absorption tube 2 is greatly reduced. Greatly reduced; the present invention arranges the brush plate 4 so that the brush plate 4 can thin the scale condensed on the outer wall of the absorption tube 2, making it convenient for the sealing bearing 36 to clean the scale condensed on the outer wall of the absorption tube 2, which not only improves the cleaning effect of the sealing bearing 36 on the scale, but also reduces the area of ​​rotational cutting between the sealing bearing 36 and the scale, thereby reducing the wear of the sealing bearing 36 and increasing the service life of the sealing bearing 36, and the cooperation between the brush plate 4 and the sliding block 43 enables the brush plate 4 to scrape off the scale on the surface of the absorption tube 2 near the upper mounting plate 3, thereby reducing the scale content condensed on the surface of the absorption tube 2, so that the practicability of the present invention is improved.

[0036] As an embodiment of the present invention, a circular hole 352 is provided at the upper end of the scraper 35, and a filter screen 353 is fixedly installed at the end of the circular hole 352 away from the drain port 12, and a filter cloth 354 is fixedly connected to the filter screen 353; during operation, when it is necessary to clean the scale on the inner wall of the absorption tube 2, there is no need to close the falling film absorber. At this time, the staff directly controls the driving motor 33 to drive the rotation through the controller, so that the scraper 35 rises under the drive of the driving motor 33. At this time, the condensed water above the scraper 35 flows through the circular hole 352 to between the lower mounting plate 3 and the scraper 35, and flows out from the water outlet 15. At this time, the condensed water between the two mounting plates 3 is in a balanced flow state; the heat generated by the friction between the screw rod 32 and the gear 31 immersed in the condensed water is absorbed by the condensed water, reducing the friction heat between the screw rod 32 and the gear 31 The generation of the filter cloth 354 reduces the wear between the screw rod 32 and the gear 31, thereby increasing the service life of the screw rod 32 and the gear 31, and due to the setting of the filter cloth 354, the scale scraped off by the scraper 35 cannot enter between the lower mounting plate 3 and the scraper 35 through the circular hole 352, avoiding the scale from sinking to the meshing position of the screw rod 32 and the gear 31 and causing damage to the driven screw rod 32 and the gear 31. The setting of the filter screen 353 enables the filter screen 353 to support the filter cloth 354, thereby increasing the service life of the filter cloth 354, and the scale generation speed is slow. Only in the short time when the scraper 35 rises and falls, there is no obvious scale condensation on the surface of the absorption tube 2. Therefore, when the scraper 35 descends, no scale on the surface of the absorption tube 2 is scraped off by the scraper 35, ensuring that there is no scale residue between the lower mounting plate 3 and the scraper 35.

[0037] As an embodiment of the present invention, a slide groove 17 is provided on the inner wall of the shell; a limit block 37 is connected to the slide groove 17 in a sliding seal; the limit block 37 is fixedly connected to the scraper 35; during operation, for different falling film absorbers, the materials of the absorber tubes 2 used are different, so the firmness of the absorber tubes 2 is also different. When the driving motor 33 drives the gear 31 to rotate through the screw rod 32, the gear 31 drives the screw rod 34 to rotate, so that the screw rod 34 drives the scraper 35 to generate a rotation trend, so that the scraper 35 drives the limit block 37 to generate a rotation trend, but the limit block 37 is limited in the slide groove 17, so that the limit block 37 cannot rotate, so that the limit block 37 drives the scraper 35 to slide upward along the slide groove 17; because when the scraper 35 has a rotation trend, the scraper 35 only relies on the support of the absorber tube 2, The scraper 35 cannot rotate and rise, so when the absorber tubes 2 are used for too long, the outer wall of the absorber tubes 2 will be corroded by scale, which weakens the strength of some parts of the absorber tubes 2. When the scraper 35 moves to the corroded area of ​​the absorber tubes 2, the absorber tubes 2 at this location cannot withstand the twisting of the scraper 35 and are damaged. Therefore, the present invention cooperates with the limit block 37 and the slide groove 17, so that the limit block 37 limits the scraper 35, avoids the rotation tendency of the scraper 35, and causes the scraper 35 to generate a twisting force on the absorber tubes 2, which not only prevents the absorber tubes 2 from being damaged by the twisting of the scraper 35, thereby improving the service life of the absorber tubes 2, but also ensures that the scraper 35 can be used for absorber tubes 2 made of various materials, thereby improving the application range of the scraper 35, and effectively improving the actual use effect of the present invention.

[0038] As an embodiment of the present invention, an air duct 18 is opened in the tube body 1; one end of the air duct 18 is connected to the water inlet 14, and the other end is connected to the chute 17; during operation, when the scraper 35 rises and scrapes the scale on the surface of the absorption tube 2, the scale scraped off by the scraper 35 will be spread on the upper end of the scraper 35 driven by the brush plate 4, so that part of the scale will enter the chute 17 and accumulate on the limit block 37. Since the condensed water enters from the water inlet 14, part of the condensed water flows into the air duct 18, so that the condensed water in the air duct 18 is sprayed out from the chute 17. When the limit block 37 moves to the air duct 18, the condensed water sprayed through the air duct 18 can disperse the accumulated scale on the limit block 37, so that there is no scale residue on the limit block 37, so that the practical application effect of the present invention is further improved.

[0039] The specific workflow is as follows:

[0040] The staff controls the absorption liquid to enter from the washing liquid port 13 through the controller, so that the absorption liquid overflows the port of the absorption tube 2 and flows down along the inner wall of the absorption tube 2. At this time, the hydrochloric acid tail gas is controlled to enter the tube body 1 from the air inlet 11, so that the hydrochloric acid tail gas enters the absorption tube 2 and is absorbed by the absorption liquid on the inner wall of the absorption tube 2, so that the hydrochloric acid tail gas releases heat on the inner wall of the absorption tube 2. At this time, the controller controls the cooling water to enter from the water inlet 14 and fill the space between the two mounting plates 3, so that the cooling water cools the absorption tube 2, and when the cooling water fills the space between the two mounting plates 3, the water outlet 15 is opened to allow the cooling water to flow out from the water outlet 15, so that the water flow between the two mounting plates 3 remains uniform. When the absorption liquid flows out from the lower end of the absorption tube 2, the absorption liquid and the hydrochloric acid therein are discharged from the discharge port 12, and the hydrochloric acid tail gas that has not been absorbed is discharged from the exhaust port 16 and is processed in the next step. As the absorption liquid in the absorption tube 2 absorbs the hydrochloric acid tail gas, scale is continuously condensed on the outer wall of the absorption tube 2. When it is necessary to clean the scale on the outer wall of the absorption tube 2, the staff controls the falling film absorber to stop through the controller, so that the cooling water completely flows out from the water outlet 15. At this time, the controller controls the driving motor 33 to rotate, so that the driving motor 33 drives the gear 31 and the screw 34 to rotate synchronously through the screw 32, so that the scraper 35 slides upward along the inner wall of the tube body 1, so that the scraper 35 The scraper 35 slides upward along the absorbent tube 2, so that the scale on the outer wall of the absorbent tube 2 is scraped off the outer wall of the absorbent tube 2 by the side wall of the through hole 351. When the scraper 35 contacts the mounting plate 3 above, the controller controls the driving motor 33 to reverse, so that the driving motor 33 drives the gear 31 and the screw 34 to rotate in the opposite direction, so that the scraper 35 is reset. At this time, the controller controls the falling film absorber to operate, so that the cooling water enters from the water inlet 14, so that the scale above the scraper 35 flows out from the water outlet 15 with the cooling water; when the scraper 35 moves upward, the sealed bearing 36 in the scraper 35 moves upward under the drive of the scraper 35, so that the sealed bearing 36 drives the slider 361 along the sliding , so that the sealed bearing 36 drives the slider 361 to rotate upward along the spiral groove 21, so that the sealed bearing 36 rotates and scrapes the scale on the outer wall of the absorption tube 2. When the slider 361 slides along the slide groove 17, the slider 361 can scrape off the scale condensed in the slide groove 17. When the sealed bearing 36 rotates and rubs the harder scale condensed on the outer wall of the absorption tube 2, the hard scale is broken under the rotational friction of the sealed bearing 36, so that the sealed bearing 36 scrapes off the scale that is broken and adhered to the outer wall of the absorption tube 2, avoiding the sealed bearing 36 from being damaged due to the impact of translational cutting between the sealed bearing 36 and the scale, thereby improving the service life of the sealed bearing 36;The rotation of the sealing bearing 36 can drive the water flow at its location to rotate, so that the water flow above the sealing bearing 36 rotates, so that the water flow impacts the scale cut by the sealing bearing 36, accelerates the scale to separate from the outer wall of the absorption tube 2, and the sealing bearing 36 rotates, so that the water flow drives the scale scraped off the upper end of the sealing bearing 36 to rotate, so that the scraped scale is away from the absorption tube 2 under the centrifugal rotation of the water flow, and the scale is prevented from accumulating too high on the sealing bearing 36, and the sealing bearing 36 is prevented from being blocked by the scale and unable to scrape the scale on the outer wall of the upper absorption tube 2. ;

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A tail gas purification system for dichlorophenol production, comprising a falling film absorber, characterized in that: The falling film absorber further comprises a tube body (1), an absorber tube array (2) and a controller; two upper and lower mounting plates (3) are fixedly mounted on the inner wall of the tube body (1), and the mounting plates (3) are used to fix the absorber tube array (2); an air inlet (11) is provided at one end of the tube body (1), and a liquid discharge port (12) is provided at the other end; a washing liquid port (13), a water inlet (14), a water outlet (15) and an exhaust port (16) are sequentially provided on the outer wall of the tube body (1) between the air inlet (11) and the liquid discharge port (12); the water inlet (14) is communicated with the water outlet (15); the washing liquid port (13) is located between the air inlet (11) and the absorber tube array (2); the lower wall of the tube body (1) is provided with a gas inlet (11) and a liquid discharge port (12); A gear (31) is rotatably connected to the mounting plate (3) on the side thereof; a screw (32) is rotatably and sealably connected to the inner wall of the tube body (1); the screw (32) meshes with the gear (31); a driving motor (33) is fixedly connected to the outer wall of the tube body (1); the output end of the driving motor (33) is fixedly connected to one end of the screw (32); a screw (34) is fixedly connected to the center of the gear (31); a scraper (35) is provided on the gear (31); the scraper (35) is threadedly connected to the screw (34); a through hole (351) is provided in the scraper (35); the absorber tubes (2) are slidably and sealably connected in the through hole (351); the controller is used to control the automatic operation of the entire falling film absorber; A sealing bearing (36) is fixedly installed in the through hole (351); a spiral groove (21) is provided on the outer wall of the absorber tube (2); a slider (361) is fixedly connected to the inner ring of the sealing bearing (36); the slider (361) is slidably and sealingly connected to the spiral groove (21); A brush plate (4) is provided above the sealing bearing (36); an arc-shaped inclined groove (41) and a groove (42) are provided at the lower end of the brush plate (4); the arc-shaped inclined groove (41) is communicated with the groove (42); a sliding block (43) is slidably connected in the arc-shaped inclined groove (41); the sliding block (43) is fixedly connected to the sealing bearing (36); a supporting spring (45) is fixedly connected to the side wall of the groove (42), and a compression spring (44) is fixedly connected to the bottom of the groove (42); a pushing plate (46) is fixedly connected to one end of the supporting spring (45) close to the sliding block (43); the pushing plate (46) is in sliding contact with the sliding block (43).

2. The tail gas purification system for dichlorophenol production according to claim 1, characterized in that: A circular hole (352) is formed at the upper end of the scraper (35), a filter screen (353) is fixedly mounted on one end of the circular hole (352) away from the liquid discharge port (12), and a filter cloth (354) is fixedly connected to the filter screen (353).

3. The tail gas purification system for dichlorophenol production according to claim 1, characterized in that: The inner wall of the tube body (1) is provided with a sliding groove (17); a limiting block (37) is slidably sealed and connected inside the sliding groove (17); and the limiting block (37) is fixedly connected to the scraper (35).

4. The tail gas purification system for dichlorophenol production according to claim 1, characterized in that: An air passage (18) is provided in the tube body (1); one end of the air passage (18) is connected to the water inlet (14), and the other end is connected to the chute (17).

Images