Phosphoric acid flash cooling device with low-position flash evaporation coupled with water ring vacuum and process

Abstract

The application relates to the technical field of phosphoric acid slurry wastewater treatment flash evaporation devices, and discloses a low-position flash evaporation coupling water ring vacuum phosphoric acid flash cooling device and process, which comprises a phosphoric acid slurry transmission chamber, a flash evaporation chamber, a motor, an adapter shaft, a bottom scraping frame, a side scraping frame, an assembling part, a feeding part, a first connecting shaft, a feeding auger blade and a material collecting part, wherein the flash evaporation chamber comprises a chamber shell, a base and an adapter ring body, the base is fixedly connected with the chamber shell through a first connecting frame, and the adapter ring body is rotationally arranged on the base. The adapter shaft is rotationally arranged in the flash evaporation chamber, the bottom scraping frame and the side scraping frame are arranged on the periphery of the adapter shaft, the rotating bottom scraping frame scrapes off the dirt attached to the base, the rotating side scraping frame scrapes off the dirt attached to the inner wall of the chamber shell, thereby completing the cleaning treatment of the dirt on the inner wall of the flash evaporation chamber, and meanwhile, the feeding auger blade can be adjusted to rotate, so that the scraped-off dirt is stored in the material collecting part, and the application is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of flash evaporation devices for treating phosphate slurry wastewater, and particularly to a phosphate flash cooling device and process that couples low-level flash evaporation with a water ring vacuum. Background Technology

[0002] In the production of wet-process phosphoric acid, the decomposition reactions of phosphate rock slurry and sulfuric acid are both strongly exothermic, generating a large amount of heat. Phosphoric acid slurry wastewater is produced during this process, and this wastewater has a high heat content. To facilitate subsequent wastewater treatment, the discharged phosphoric acid slurry wastewater typically undergoes low-level flash evaporation for cooling. This is done by sending the high-temperature phosphoric acid slurry wastewater into a low-pressure flash evaporation chamber, where the water in the wastewater evaporates instantly under reduced pressure, thus completing the flash evaporation and flash cooling treatment of the phosphoric acid slurry wastewater.

[0003] However, the generated phosphate slurry wastewater has characteristics such as high solid content, containing a large amount of calcium, magnesium, sulfate and other ions. When the phosphate slurry wastewater is flash-cooled, a hard scale layer will form on the inner wall of the flash chamber. The scale on the inner wall of the flash chamber needs to be cleaned regularly. The existing low-level flash evaporation device requires shutdown and manual cleaning. The manual cleaning of the scale in the flash chamber after shutdown consumes too much time. Therefore, this solution proposes a low-level flash evaporation coupled with water ring vacuum phosphate flash cooling device and process to solve the above problems. Summary of the Invention

[0004] In view of this, the present invention proposes a phosphoric acid flash cooling device and process with low-level flash evaporation coupled with water ring vacuum, in order to solve the technical problem that existing low-level flash evaporation devices require shutdown and manual cleaning when periodically cleaning the scale on the inner wall of the flash chamber, which consumes too much time.

[0005] The technical solution of this invention is implemented as follows: This invention provides a phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum, including a phosphoric acid slurry transfer chamber, a flash chamber, a motor, a connecting shaft, a bottom scraper, a side scraper, an assembly, a feeding component, a first connecting shaft, a feeding auger blade, and a collecting component, wherein, The flash chamber includes a chamber shell, a base, and a transition ring. The base is fixedly connected to the chamber shell via a first connecting frame. The transition ring is rotatably mounted on the base and seals against the bottom wall of the chamber shell. A low-level drop pipe connects the phosphoric acid slurry transfer chamber and the flash chamber. A motor is mounted on the base, and the adapter shaft is fixedly connected to the output shaft of the motor and extends into the interior of the housing. A bottom scraper is disposed on the bottom periphery of the adapter shaft and abuts against the base. It is used to rotate to scrape off dirt attached to the base. A first bottom guide protrusion is provided on the side wall of the bottom scraper. The side scraper is connected to the outside of the adapter shaft via a second connecting frame and abuts against the inner wall of the chamber shell. It is used to rotate to scrape off the dirt attached to the inner wall of the chamber shell. The side scraper is provided with a side guide protrusion on its side wall. The assembly is located at the end of the side scraper, and the feeding component is located on one side of the assembly and is fixedly connected to the adapter ring. The adapter ring has a first flow cavity that communicates with the inner wall of the adapter ring, and the feeding component has a second flow cavity that communicates with the first flow cavity. Both the first flow cavity and the second flow cavity are circular cavities. The side wall of the assembly is provided with a second bottom guide protrusion that is flush with the first bottom guide protrusion. The side wall of the feeding component is provided with a side feed port, and the top of the feeding component is provided with a top feed port. The end of the side guide protrusion extends to the top feed port, and the end of the second bottom guide protrusion extends to the side feed port. The first connecting shaft is rotatably disposed on the inner side of the assembly and extends into the interior of the first flow cavity. The feeding auger blade is disposed on the periphery of the first connecting shaft and is used to transport dirt in the second flow cavity and the first flow cavity. The material collecting component is disposed on the outside of the adapter ring, and the material collecting component has an internal cavity that communicates with the first flow cavity.

[0006] Based on the above technical solutions, preferably, the material collector is an arc-shaped part, and the included angle between the two ends of the material collector is α, 90°<α<180°, the bottom end of the material collector is provided with a discharge port, and the bottom end of the material collector is detachably connected with a discharge cover plate, which is used to cover the discharge port.

[0007] Based on the above technical solutions, preferably, it also includes a second connecting shaft, a drive gear, a first transmission gear, and a second transmission gear, wherein... The second connecting shaft is rotatably disposed on the inner side of the assembly, and the drive gear is disposed on the second connecting shaft. The base is provided with a ring tooth groove, and the drive gear extends out of the assembly and engages with the ring tooth groove. A first transmission gear is mounted on the second connecting shaft, and a second transmission gear is mounted on the first connecting shaft. The first transmission gear and the second transmission gear mesh with each other.

[0008] Based on the above technical solutions, preferably, the system also includes a first sealing gasket and a second sealing gasket, wherein... A first sealing gasket is disposed on the outside of the feeding component and is sealed and fitted to the inner wall of the chamber shell. The top wall of the first sealing gasket is flush with the top wall of the feeding component, and the inner side wall of the first sealing gasket extends to the side feed port. A second sealing gasket is disposed at the bottom of the assembly and covers the annular groove.

[0009] Based on the above technical solutions, preferably, a sliding assembly groove is provided on the outer side of the chamber shell, the first connecting frame is slidably connected to the sliding assembly groove, and is fixedly connected to the chamber shell by bolts, and the sliding assembly groove extends to the bottom end of the chamber shell.

[0010] Based on the above technical solutions, preferably, the system also includes a condenser, a water ring vacuum pump, and a circulating pump, wherein, The steam inlet of the condenser is connected to the inner cavity of the outer shell of the chamber, and the steam outlet of the condenser is connected to the water ring vacuum pump. The inlet of the circulating pump is connected to the base through a first circulating pipe, the outlet of the circulating pump is connected to a second circulating pipe, the end of the second circulating pipe is connected to a third circulating pipe through a flange, and the third circulating pipe is connected to the phosphoric acid slurry transfer chamber.

[0011] Based on the above technical solutions, preferably, the first connecting frame is a bent connecting frame, the first circulation pipe is a bent pipe, a first clearance gap is formed between the two ends of the first connecting frame, and a second clearance gap is formed between the two ends of the first circulation pipe. The first clearance gap is used to allow the material collection component to be positioned, and the second clearance gap is used to allow the first connecting frame to be positioned.

[0012] Based on the above technical solutions, preferably, it also includes a partition, a vent, and a gas-liquid separator, wherein, A partition is disposed inside the outer shell of the chamber and divides the inner cavity of the outer shell of the chamber into a lower reaction chamber and an upper assembly chamber, and the top wall of the side scraper abuts against the partition; A ventilator is provided inside the upper assembly cavity. A first vent is provided on the partition plate, a second vent is provided on the outer shell of the chamber, and a third vent is provided on the ventilator that communicates with the first vent and the second vent. Multiple gas-liquid separators are disposed inside the ventilator, and each gas-liquid separator includes a first gas-liquid separator plate and a second gas-liquid separator plate. The first gas-liquid separator plate and the second gas-liquid separator plate are distributed in the height direction and are both inclined plates. The first gas-liquid separator plate and the second gas-liquid separator plate are respectively disposed on opposite side walls of the inner cavity of the ventilator, and ventilation gaps are formed between the first gas-liquid separator plate and the inner wall of the ventilator.

[0013] Based on the above technical solutions, a preferred embodiment also includes a liquid collection hopper, wherein... A liquid discharge port is provided between the top and bottom of the first gas-liquid separation plate, and the liquid discharge port is located at the end of the first gas-liquid separation plate; An assembly groove is provided on the outer side of the venting cylinder, and the liquid collecting hopper is slidably inserted into the inner side of the assembly groove and sealed with the venting cylinder. The liquid collecting hopper is located below the first gas-liquid separation plate at the bottom. The inner wall of the vent is provided with a liquid collection channel that communicates with the assembly groove, and the liquid inlet end of the liquid collection channel is located above the first gas-liquid separation plate at the bottom.

[0014] This invention also proposes a phosphoric acid flash cooling process using low-level flash evaporation coupled with a water-ring vacuum, characterized in that it is completed using the phosphoric acid flash cooling device using low-level flash evaporation coupled with a water-ring vacuum as described in any one of the claims, comprising the following steps: S1. The internal air pressure of the chamber shell is controlled at -65kPa in advance by using a water ring vacuum pump; S2. Supply the phosphoric acid slurry wastewater to be flashed into the inside of the phosphoric acid slurry transfer chamber and close the drain end of the phosphoric acid slurry transfer chamber. At this time, the phosphoric acid slurry wastewater flows into the inside of the chamber shell through the low-level drop pipe and is stored inside the chamber shell under the action of the base and the transfer ring, and is flashed and cooled. S3. The phosphoric acid slurry wastewater inside the outer shell of the circulating extraction chamber is supplied to the phosphoric acid slurry transfer chamber. The air pressure inside the outer shell of the chamber is maintained at -65kPa by a water ring vacuum pump. During this period, the phosphoric acid slurry wastewater is continuously circulated through the flash evaporation chamber to complete the flash evaporation and flash cooling treatment of the phosphoric acid slurry wastewater.

[0015] The phosphoric acid flash cooling device and process of the present invention with low-level flash evaporation coupled with water ring vacuum has the following advantages over the prior art: (1) The phosphoric acid flash cooling device of the low-position flash evaporation coupled with water ring vacuum of this application has a rotating adapter shaft inside the flash chamber, and a bottom scraper and a side scraper are arranged around the adapter shaft. The rotating bottom scraper scrapes off the dirt attached to the base, and the rotating side scraper scrapes off the dirt attached to the inner wall of the chamber shell, thereby completing the cleaning treatment of the dirt on the inner wall of the flash chamber of this application. By setting a first bottom guide protrusion on the side wall of the bottom scraper and a second bottom guide protrusion on the side wall of the side scraper, when the adapter shaft drives the bottom scraper and the side scraper to rotate for scraping dirt, the dirt scraped on the base will fall into the interior of the feeding component through the side feed port along the first and second bottom guide protrusions as the adapter shaft rotates. The dirt scraped on the inner wall of the chamber shell will fall with gravity and fall into the interior of the feeding component through the top feed port along the second bottom guide protrusion. The first connecting shaft is adjusted to rotate synchronously, and the first connecting shaft drives the feeding auger blade to rotate. Since the first flow cavity and the second flow cavity are both circular cavities, the scraped and collected dirt can be pushed and collected in the collecting component under the action of the rotating feeding auger blade, which is convenient to use.

[0016] (2) By setting a second connecting shaft, since the drive gear meshes on the ring tooth groove opened on the base, during the adjustment of the adapter shaft rotation, the rotating drive gear will drive the second connecting shaft to rotate under the action of the ring tooth groove. The second connecting shaft drives the first connecting shaft to rotate through the first transmission gear and the second transmission gear, thereby completing the automatic drive processing of the feeding auger blade. There is no need to set an additional drive structure for the feeding auger blade. When adjusting the adapter shaft to rotate and scrape the dirt, the automatic drive processing of the feeding auger blade can be realized, which is convenient to use.

[0017] (3) By setting a venting tube between the lower reaction chamber and the upper assembly chamber, the steam generated by flash evaporation in the flash chamber will flow into the interior of the condenser through the baffle and the venting tube. Since the steam generated by flash evaporation contains liquid impurities, in order to prevent the liquid impurities from scaling inside the condenser, multiple sets of gas-liquid separators are set. Since each set of gas-liquid separators includes a first gas-liquid separation plate and a second gas-liquid separation plate, the gas phase is separated under the mutual shielding effect of the first gas-liquid separation plate and the second gas-liquid separation plate, effectively shielding the liquid impurities carried in the steam. Since the gas-liquid separation plate is an inclined plate, the liquid impurities gathered at the end of the first gas-liquid separation plate will fall to the top of the bottom first gas-liquid separation plate through the liquid outlet, while the liquid impurities at the bottom of the first gas-liquid separation plate will fall into the interior of the liquid collection hopper along the first gas-liquid separation plate. The liquid impurities at the top of the first gas-liquid separation plate will fall into the interior of the liquid collection hopper through the liquid collection channel, thereby facilitating the separation and collection of liquid impurities from the flash steam of this application, and making it convenient to use. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front perspective view of the phosphoric acid flash cooling device with low-position flash evaporation coupled to a water ring vacuum according to the present invention. Figure 2 This is a rear perspective view of the phosphoric acid flash cooling device with low-position flash evaporation coupled to a water ring vacuum according to the present invention. Figure 3 This is a three-dimensional schematic diagram of the structure of the flash chamber of the phosphoric acid flash cooling device with low-position flash evaporation coupled to a water ring vacuum according to the present invention. Figure 4 This invention relates to a low-level flash evaporation coupled water ring vacuum phosphoric acid flash cooling device. Figure 3 Right view of the structure shown; Figure 5 This invention relates to a low-level flash evaporation coupled water ring vacuum phosphoric acid flash cooling device. Figure 4 A cross-sectional view of the structure at point AA shown. Figure 6 The phosphoric acid flash cooling device of the present invention is a low-level flash evaporation coupled with a water ring vacuum. Figure 5 An enlarged view of point B is shown below; Figure 7 This is a cross-sectional schematic diagram of the structure at the vent of the phosphoric acid flash cooling device with low-position flash evaporation coupled to a water ring vacuum according to the present invention. Figure 8 This is a three-dimensional schematic diagram of the base structure of the phosphoric acid flash cooling device with low-position flash evaporation coupled to a water ring vacuum according to the present invention. Figure 9 This invention relates to a low-level flash evaporation coupled water ring vacuum phosphoric acid flash cooling device. Figure 8 An enlarged view of point C is shown below; Figure 10 This is a three-dimensional schematic diagram of the structure of the feeding component of the low-position flash evaporation coupled water ring vacuum phosphoric acid flash cooling device of the present invention. Figure 11 The phosphoric acid flash cooling device of the present invention is a low-level flash evaporation coupled with a water ring vacuum. Figure 10 Right-side stereoscopic view of the structure shown.

[0020] In the diagram: 11. Phosphate slurry transfer chamber; 12. Flash chamber; 121. Chamber shell; 1211. Lower reaction chamber; 1212. Upper assembly chamber; 1213. Sliding assembly groove; 1214. Second vent; 122. Base; 1221. Ring tooth groove; 123. Adapter ring; 1231. First flow chamber; 124. First connecting frame; 1241. First clearance gap; 13. Low-level drop pipe; 14. Condenser; 15. Water ring vacuum pump; 16. Circulation pump; 17. First circulation pipe; 171. Second clearance gap; 18. Second circulation pipe; 19. Third circulation pipe; 110. Flange; 21. Motor; 22. Adapter shaft; 23. Bottom scraper; 231. First bottom impurity guide protrusion; 24. Side scraper; 241. Side impurity guide protrusion; 25. Second connecting frame; 31 1. Assembly parts; 311. Second bottom guide protrusion; 32. Feeding component; 321. Second flow cavity; 322. Side feed port; 323. Top feed port; 41. First connecting shaft; 42. Feeding auger blade; 43. Collecting component; 431. Collecting inner cavity; 432. Discharge port; 44. Discharge cover plate; 51. Second connecting shaft; 52. Drive gear; 53. First transmission gear; 54. Second transmission gear; 61. First sealing gasket; 62. Second sealing gasket; 71. Partition plate; 711. First vent; 72. Vent cylinder; 721. Third vent; 722. Assembly groove; 723. Liquid collection channel; 73. Gas-liquid separator; 731. First gas-liquid separator plate; 7311. Liquid outlet; 732. Second gas-liquid separator plate; 8. Liquid collection hopper; 9. Assembly base. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1-11As shown, the phosphoric acid flash cooling device of the present invention with low-position flash evaporation coupled with water ring vacuum includes a phosphoric acid slurry transfer chamber 11, a flash chamber 12, a motor 21, a connecting shaft 22, a bottom scraper 23, a side scraper 24, an assembly 31, a feeding component 32, a first connecting shaft 41, a feeding auger blade 42, and a collecting component 43. The flash chamber 12 includes a chamber shell 121, a base 122, and a connecting ring 123. The base 122 is fixedly connected to the chamber shell 121 via a first connecting frame 124. The connecting ring 123 is rotatably mounted on the base 122 and seals against the bottom wall of the chamber shell 121. The phosphoric acid slurry transfer chamber 11 and the flash chamber 12... A low-level drop pipe 13 is connected between the two. A motor 21 is mounted on a base 122, and a transfer shaft 22 is fixedly connected to the output shaft of the motor 21, extending into the interior of the chamber shell 121. A bottom scraper 23 is located on the bottom periphery of the transfer shaft 22 and abuts against the base 122, used to rotate and scrape off dirt adhering to the base 122. A first bottom guide protrusion 231 is provided on the side wall of the bottom scraper 23. A side scraper 24 is connected to the outside of the transfer shaft 22 via a second connecting frame 25 and abuts against the inner wall of the chamber shell 121, used to rotate and scrape off dirt adhering to the inner wall of the chamber shell 121. A side guide is provided on the side wall of the side scraper 24. The assembly 31 is located at the end of the side scraper 24, and the feeder 32 is located on one side of the assembly 31 and is fixedly connected to the adapter ring 123. The adapter ring 123 has a first flow cavity 1231 that communicates with the inner wall of the adapter ring 123. The feeder 32 has a second flow cavity 321 that communicates with the first flow cavity 1231. Both the first flow cavity 1231 and the second flow cavity 321 are circular cavities. The side wall of the assembly 31 is provided with a second bottom guide protrusion 311 that is flush with the first bottom guide protrusion 231. The side wall of the feeder 32 is provided with a side feed port 322. The top of the feeding component 32 is provided with a top feed port 323, the end of the side guide protrusion 241 extends to the top feed port 323, and the end of the second bottom guide protrusion 311 extends to the side feed port 322; the first connecting shaft 41 is rotatably disposed on the inner side of the assembly 31 and extends into the interior of the first flow cavity 1231, and the feeding auger blade 42 is disposed on the periphery of the first connecting shaft 41 for conveying dirt in the second flow cavity 321 and the first flow cavity 1231; the collecting component 43 is disposed on the outer side of the adapter ring 123, and the interior of the collecting component 43 forms a collecting inner cavity 431 that communicates with the first flow cavity 1231.

[0023] In practice, the internal pressure of the outer shell 121 is controlled at -65 kPa in advance by the water ring vacuum pump 15; the phosphoric acid slurry wastewater to be flashed is supplied to the inside of the phosphoric acid slurry transfer chamber 11, and the drain end of the phosphoric acid slurry transfer chamber 11 is closed. At this time, the phosphoric acid slurry wastewater flows into the inside of the outer shell 121 through the low-level drop pipe 13, and is stored inside the outer shell 121 under the action of the base 122 and the transfer ring 123, and is flashed and cooled; the phosphoric acid slurry wastewater inside the outer shell 121 is circulated and pumped out and supplied to the phosphoric acid slurry transfer chamber 11. The internal pressure of the outer shell 121 is maintained at -65 kPa by the water ring vacuum pump 15. During this period, the phosphoric acid slurry wastewater is continuously circulated through the flash chamber 12 to complete the flash evaporation and flash cooling treatment of the phosphoric acid slurry wastewater.

[0024] The phosphoric acid flash cooling device of this application with low-position flash evaporation coupled with water ring vacuum has a rotatable adapter shaft 22 inside the flash chamber 12, and a bottom scraper 23 and a side scraper 24 are arranged around the adapter shaft 22. The rotating bottom scraper 23 scrapes off the dirt attached to the base 122, and the rotating side scraper 24 scrapes off the dirt attached to the inner wall of the chamber shell 121, thereby completing the cleaning of the dirt on the inner wall of the flash chamber 12 of this application. By providing a first bottom guide protrusion 231 on the side wall of the bottom scraper 23 and a side guide protrusion 241 on the side wall of the side scraper 24, when the adapter shaft 22 drives the bottom scraper 23 and the side scraper 24 to rotate for scraping dirt, the dirt scraped off the base 122 will fall through the first bottom guide protrusion 231 and the second bottom guide protrusion 311 from the side feed port 322 into the interior of the feeder 32. The dirt scraped off the inner wall of the outer shell 121 falls with gravity and along the side guide protrusion 241, falls from the top feed port 323 into the interior of the feeding component 32. Simultaneously, the first connecting shaft 41 is adjusted to rotate, and the first connecting shaft 41 drives the feeding auger blade 42 to rotate. Since the first flow cavity 1231 and the second flow cavity 321 are both circular cavities, under the action of the rotating feeding auger blade 42, the scraped and collected dirt can be pushed and collected in the collecting component 43, which is convenient for use.

[0025] In a preferred embodiment, the material collector 43 is an arc-shaped part, and the included angle between the two ends of the material collector 43 is α, 90°<α<180°. The bottom end of the material collector 43 is provided with a discharge port 432. The bottom end of the material collector 43 is detachably connected with a discharge cover plate 44, which is used to cover the discharge port 432.

[0026] In practice, the discharge cover plate 44 is connected to the material collection component 43 by bolts, and the discharge cover plate 44 is provided with a sealing protrusion for sealing the discharge port 432.

[0027] This design allows the collection hopper 43, which is connected to the adapter ring 123, to have an upward curve after passing around the bottom. This allows the dirt collected inside the collection hopper 43 to be stored at the bottom of the collection hopper 43. By setting a discharge cover plate 44 at the bottom to cover the dirt inside the collection hopper 43, the dirt is stored inside the collection hopper 43. When it is necessary to clean the dirt stored inside the collection hopper 43, the discharge cover plate 44 can be removed, and the dirt can be cleaned from the bottom of the collection hopper 43.

[0028] In a preferred embodiment, the assembly further includes a second connecting shaft 51, a drive gear 52, a first transmission gear 53, and a second transmission gear 54. The second connecting shaft 51 is rotatably disposed inside the assembly 31, and the drive gear 52 is disposed on the second connecting shaft 51. The base 122 has an annular groove 1221, and the drive gear 52 extends out of the assembly 31 and engages with the annular groove 1221. The first transmission gear 53 is disposed on the second connecting shaft 51, and the second transmission gear 54 is disposed on the first connecting shaft 41. The first transmission gear 53 and the second transmission gear 54 mesh with each other.

[0029] By setting a second connecting shaft 51, and since the drive gear 52 meshes with the annular groove 1221 opened on the base 122, during the adjustment of the adapter shaft 22, the rotating drive gear 52 will drive the second connecting shaft 51 to rotate under the action of the annular groove 1221. The second connecting shaft 51 drives the first connecting shaft 41 to rotate through the first transmission gear 53 and the second transmission gear 54, thereby completing the automatic drive processing of the feeding auger blade 42. There is no need to set up an additional drive structure for the feeding auger blade 42. The automatic drive processing of the feeding auger blade 42 can be achieved when the adapter shaft 22 is adjusted to rotate and scrape dirt, which is convenient to use.

[0030] In a preferred embodiment, the device further includes a first sealing gasket 61 and a second sealing gasket 62. The first sealing gasket 61 is disposed on the outer side of the feeding component 32 and is sealed against the inner wall of the outer casing 121. The top wall of the first sealing gasket 61 is flush with the top wall of the feeding component 32, and the inner wall of the first sealing gasket 61 extends to the side feed inlet 322. The second sealing gasket 62 is disposed at the bottom of the assembly 31 and covers the annular groove 1221.

[0031] This design, by setting the first sealing gasket 61 to block, ensures that dirt on the base 122 is generated at the bottom scraper 23 and the assembly 31, making it easy to scrape and collect the dirt on the base 122. By setting the second sealing gasket 62 to block the ring tooth groove 1221, dirt is prevented from being generated inside the ring tooth groove 1221, thereby affecting the connection of the drive gear 52, making it convenient to use.

[0032] In a preferred embodiment, a sliding assembly groove 1213 is provided on the outer side of the chamber shell 121. The first connecting frame 124 is slidably connected to the sliding assembly groove 1213 and fixedly connected to the chamber shell 121 by bolts. The sliding assembly groove 1213 extends to the bottom end of the chamber shell 121.

[0033] This design allows the base 122 and the adapter ring 123 to be slidably attached to the outer shell 121 from the bottom, while also facilitating the disassembly of the base 122 and the adapter ring 123 by sliding. After disassembly, it is convenient to perform complete maintenance on the inner cavity of the flash chamber 12.

[0034] In a preferred embodiment, the system further includes a condenser 14, a water ring vacuum pump 15, and a circulation pump 16. The steam inlet of the condenser 14 is connected to the inner cavity of the outer casing 121, and the steam outlet of the condenser 14 is connected to the water ring vacuum pump 15. The liquid inlet of the circulation pump 16 is connected to the base 122 through a first circulation pipe 17, and the liquid outlet of the circulation pump 16 is connected to a second circulation pipe 18. The end of the second circulation pipe 18 is connected to a third circulation pipe 19 through a flange 110, and the third circulation pipe 19 is connected to the phosphoric acid slurry transfer chamber 11.

[0035] In practice, the condenser 14 is mounted on the outer casing 121, the bottom of the base 122 is provided with an assembly seat 9, and the circulation pump 16 is mounted on the assembly seat 9.

[0036] In practice, the vapor generated by flash evaporation is condensed into liquid by the condenser 14 and then extracted by the water ring vacuum pump 15. Simultaneously, the water ring vacuum pump 15 maintains the internal pressure of the flash chamber 12 at -65 kPa by pumping the gas and liquid, allowing for continuous flash evaporation and convenient operation. Meanwhile, the liquid after flash evaporation and cooling is extracted by the circulation pump 16 and supplied to the phosphoric acid slurry transfer chamber 11 through the second circulation pipe 18 and the third circulation pipe 19. The second circulation pipe 18 and the third circulation pipe 19 are connected by a flange 110, allowing for simultaneous disassembly of the second and third circulation pipes when the base 122 is disassembled, further facilitating operation.

[0037] In a preferred embodiment, the first connecting frame 124 is a bent connecting frame, the first circulation pipe 17 is a bent pipe, a first clearance gap 1241 is formed between the two ends of the first connecting frame 124, and a second clearance gap 171 is formed between the two ends of the first circulation pipe 17. The first clearance gap 1241 is used to allow the material collection component 43 to pass, and the second clearance gap 171 is used to allow the first connecting frame 124 to pass.

[0038] In a preferred embodiment, the system further includes a partition 71, a vent 72, and a gas-liquid separator 73. The partition 71 is disposed inside the outer shell 121, dividing the inner cavity of the outer shell 121 into a lower reaction chamber 1211 and an upper assembly chamber 1212. The top wall of the side scraper 24 abuts against the partition 71. The vent 72 is disposed inside the upper assembly chamber 1212. The partition 71 has a first vent hole 711, the outer shell 121 has a second vent hole 1214, and the vent 72 has a connection point connecting the first vent hole 711 and the second vent hole 1214. A third vent 721 is connected; multiple gas-liquid separators 73 are disposed inside the vent cylinder 72, and the gas-liquid separators 73 include a first gas-liquid separator plate 731 and a second gas-liquid separator plate 732. The first gas-liquid separator plate 731 and the second gas-liquid separator plate 732 are distributed in the height direction and are both inclined plates. The first gas-liquid separator plate 731 and the second gas-liquid separator plate 732 are respectively disposed on opposite side walls of the inner cavity of the vent cylinder 72. A ventilation gap is formed between the first gas-liquid separator plate 731 and the second gas-liquid separator plate 732 and the inner cavity wall of the vent cylinder 72.

[0039] It also includes a liquid collection hopper 8, wherein a liquid outlet 7311 is provided between the top and bottom of the upper first gas-liquid separation plate 731, and the liquid outlet 7311 is located at the end of the first gas-liquid separation plate 731; an assembly groove 722 is provided on the outer side of the venting cylinder 72, the liquid collection hopper 8 is slidably inserted into the inner side of the assembly groove 722 and sealed with the venting cylinder 72, and the liquid collection hopper 8 is located below the bottom first gas-liquid separation plate 731; a liquid collection channel 723 is provided on the inner wall of the venting cylinder 72, which is connected to the assembly groove 722, and the liquid inlet end of the liquid collection channel 723 is located above the bottom first gas-liquid separation plate 731.

[0040] By installing a vent 72 between the lower reaction chamber 1211 and the upper assembly chamber 1212, the steam generated by flash evaporation in the flash chamber 12 flows into the interior of the condenser 14 through the baffle 71 and the vent 72. Since the steam generated by flash evaporation contains liquid impurities, multiple sets of gas-liquid separators 73 are installed to prevent scale formation inside the condenser 14. Each set of gas-liquid separators 73 includes a first gas-liquid separation plate 731 and a second gas-liquid separation plate 732. Gas phase separation occurs under the mutual shielding effect of the first gas-liquid separation plate 731 and the second gas-liquid separation plate 732. This effectively blocks liquid impurities carried in the steam. Due to the inclined position of the gas-liquid separation plate, the liquid impurities gathered at the end of the first gas-liquid separation plate 731 will fall through the liquid outlet 7311 to the top of the bottom first gas-liquid separation plate 731, while the liquid impurities at the bottom of the first gas-liquid separation plate 731 will fall down along the first gas-liquid separation plate 731 into the interior of the liquid collection hopper 8. The liquid impurities above the first gas-liquid separation plate 731 will fall simultaneously into the interior of the liquid collection hopper 8 through the liquid collection channel 723, thereby facilitating the separation and collection of liquid impurities from the flash steam of this application, making it convenient to use.

[0041] This invention also proposes a phosphoric acid flash cooling process coupled with a water ring vacuum, which is completed using the aforementioned phosphoric acid flash cooling device coupled with a water ring vacuum, and includes the following steps: Step 1: Control the internal air pressure of the chamber shell 121 to -65kPa in advance using the water ring vacuum pump 15; Step 2: Supply the phosphoric acid slurry wastewater to be flashed into the inside of the phosphoric acid slurry transfer chamber 11 and close the drain end of the phosphoric acid slurry transfer chamber 11. At this time, the phosphoric acid slurry wastewater flows into the inside of the chamber shell 121 through the low-level drop pipe 13, and is stored inside the chamber shell 121 under the action of the base 122 and the transfer ring 123, and is flashed and cooled. Step 3: The phosphoric acid slurry wastewater inside the outer shell 121 is circulated and supplied to the phosphoric acid slurry transfer chamber 11. The air pressure inside the outer shell 121 is maintained at -65 kPa by the water ring vacuum pump 15. During this period, the phosphoric acid slurry wastewater is continuously circulated through the flash evaporation chamber 12 to complete the flash evaporation and flash cooling treatment of the phosphoric acid slurry wastewater.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum, characterized in that: It includes a phosphate slurry transfer chamber, a flash evaporation chamber, a motor, a transfer shaft, a bottom scraper frame, a side scraper frame, assembly parts, a feeding component, a first connecting shaft, a feeding auger blade, and a collecting component, among which, The flash chamber includes a chamber shell, a base, and a transition ring. The base is fixedly connected to the chamber shell via a first connecting frame. The transition ring is rotatably mounted on the base and seals against the bottom wall of the chamber shell. A low-level drop pipe connects the phosphoric acid slurry transfer chamber and the flash chamber. A motor is mounted on the base, and the adapter shaft is fixedly connected to the output shaft of the motor and extends into the interior of the housing. A bottom scraper is disposed on the bottom periphery of the adapter shaft and abuts against the base. It is used to rotate to scrape off dirt attached to the base. A first bottom guide protrusion is provided on the side wall of the bottom scraper. The side scraper is connected to the outside of the adapter shaft via a second connecting frame and abuts against the inner wall of the chamber shell. It is used to rotate to scrape off the dirt attached to the inner wall of the chamber shell. The side scraper is provided with a side guide protrusion on its side wall. The assembly is located at the end of the side scraper, and the feeding component is located on one side of the assembly and is fixedly connected to the adapter ring. The adapter ring has a first flow cavity that communicates with the inner wall of the adapter ring, and the feeding component has a second flow cavity that communicates with the first flow cavity. Both the first flow cavity and the second flow cavity are circular cavities. The side wall of the assembly is provided with a second bottom guide protrusion that is flush with the first bottom guide protrusion. The side wall of the feeding component is provided with a side feed port, and the top of the feeding component is provided with a top feed port. The end of the side guide protrusion extends to the top feed port, and the end of the second bottom guide protrusion extends to the side feed port. The first connecting shaft is rotatably disposed on the inner side of the assembly and extends into the interior of the first flow cavity. The feeding auger blade is disposed on the periphery of the first connecting shaft and is used to transport dirt in the second flow cavity and the first flow cavity. The material collecting component is disposed on the outside of the adapter ring, and the material collecting component has an internal cavity that communicates with the first flow cavity.

2. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 1, characterized in that: The material collector is an arc-shaped component, and the included angle between the two ends of the material collector is α, where 90° < α < 180°. The bottom end of the material collector is provided with a discharge port, and a discharge cover plate is detachably connected to the bottom end of the material collector. The discharge cover plate is used to cover the discharge port.

3. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 1, characterized in that: It also includes a second connecting shaft, a drive gear, a first transmission gear, and a second transmission gear, wherein, The second connecting shaft is rotatably disposed on the inner side of the assembly, and the drive gear is disposed on the second connecting shaft. The base is provided with a ring tooth groove, and the drive gear extends out of the assembly and engages with the ring tooth groove. A first transmission gear is mounted on the second connecting shaft, and a second transmission gear is mounted on the first connecting shaft. The first transmission gear and the second transmission gear mesh with each other.

4. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 3, characterized in that: It also includes a first sealing gasket and a second sealing gasket, wherein, A first sealing gasket is disposed on the outside of the feeding component and is sealed and fitted to the inner wall of the chamber shell. The top wall of the first sealing gasket is flush with the top wall of the feeding component, and the inner side wall of the first sealing gasket extends to the side feed port. A second sealing gasket is disposed at the bottom of the assembly and covers the annular groove.

5. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 1, characterized in that: The outer side of the chamber shell is provided with a sliding assembly groove. The first connecting frame is slidably connected to the sliding assembly groove and fixedly connected to the chamber shell by bolts. The sliding assembly groove extends to the bottom end of the chamber shell.

6. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 1, characterized in that: It also includes a condenser, a water ring vacuum pump, and a circulation pump, among which, The steam inlet of the condenser is connected to the inner cavity of the outer shell of the chamber, and the steam outlet of the condenser is connected to the water ring vacuum pump. The inlet of the circulating pump is connected to the base through a first circulating pipe, the outlet of the circulating pump is connected to a second circulating pipe, the end of the second circulating pipe is connected to a third circulating pipe through a flange, and the third circulating pipe is connected to the phosphoric acid slurry transfer chamber.

7. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 6, characterized in that: The first connecting frame is a bent connecting frame, the first circulation pipe is a bent pipe, a first clearance gap is formed between the two ends of the first connecting frame, and a second clearance gap is formed between the two ends of the first circulation pipe. The first clearance gap is used to allow the material collection component to be positioned, and the second clearance gap is used to allow the first connecting frame to be positioned.

8. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 6, characterized in that: It also includes partitions, vents, and gas-liquid separators, among which, A partition is disposed inside the outer shell of the chamber and divides the inner cavity of the outer shell of the chamber into a lower reaction chamber and an upper assembly chamber, and the top wall of the side scraper abuts against the partition; A ventilator is provided inside the upper assembly cavity. A first vent is provided on the partition plate, a second vent is provided on the outer shell of the chamber, and a third vent is provided on the ventilator that communicates with the first vent and the second vent. Multiple gas-liquid separators are disposed inside the ventilator, and each gas-liquid separator includes a first gas-liquid separator plate and a second gas-liquid separator plate. The first gas-liquid separator plate and the second gas-liquid separator plate are distributed in the height direction and are both inclined plates. The first gas-liquid separator plate and the second gas-liquid separator plate are respectively disposed on opposite side walls of the inner cavity of the ventilator, and ventilation gaps are formed between the first gas-liquid separator plate and the inner wall of the ventilator.

9. The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in claim 8, characterized in that: It also includes a liquid collection hopper, among which, A liquid discharge port is provided between the top and bottom of the first gas-liquid separation plate, and the liquid discharge port is located at the end of the first gas-liquid separation plate; An assembly groove is provided on the outer side of the venting cylinder, and the liquid collecting hopper is slidably inserted into the inner side of the assembly groove and sealed with the venting cylinder. The liquid collecting hopper is located below the first gas-liquid separation plate at the bottom. The inner wall of the vent is provided with a liquid collection channel that communicates with the assembly groove, and the liquid inlet end of the liquid collection channel is located above the first gas-liquid separation plate at the bottom.

10. A phosphoric acid flash cooling process coupled with a water ring vacuum at a low position, characterized in that: The phosphoric acid flash cooling device with low-level flash evaporation coupled to a water ring vacuum as described in any one of claims 1 to 9 is used, comprising the following steps: S1. The internal air pressure of the chamber shell is controlled at -65kPa in advance by using a water ring vacuum pump; S2. Supply the phosphoric acid slurry wastewater to be flashed into the inside of the phosphoric acid slurry transfer chamber and close the drain end of the phosphoric acid slurry transfer chamber. At this time, the phosphoric acid slurry wastewater flows into the inside of the chamber shell through the low-level drop pipe and is stored inside the chamber shell under the action of the base and the transfer ring, and is flashed and cooled. S3. The phosphoric acid slurry wastewater inside the outer shell of the circulating extraction chamber is supplied to the phosphoric acid slurry transfer chamber. The air pressure inside the outer shell of the chamber is maintained at -65kPa by a water ring vacuum pump. During this period, the phosphoric acid slurry wastewater is continuously circulated through the flash evaporation chamber to complete the flash evaporation and flash cooling treatment of the phosphoric acid slurry wastewater.

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