Flash evaporation device for phosphoric acid concentration

Abstract

The invention discloses a flash evaporation device for phosphoric acid concentration, which comprises a flash evaporation assembly, comprising a flash evaporation kettle, supporting frames symmetrically fixed to the outer wall of the flash evaporation kettle, a vacuumizing pipe connected to the flash evaporation kettle, a solution inlet pipe connected to the flash evaporation kettle, a steam exhaust pipe connected to the top end of the flash evaporation kettle and an exhaust port connected to the bottom end of the flash evaporation kettle, the outer end of the vacuumizing pipe is connected with a sucking pump, and the flash kettle has a heating function; the wall cleaning assembly is arranged on the inner wall of the flash evaporation kettle and can clean the inner wall of the flash evaporation kettle; the driving assembly can drive the wall cleaning assembly to clean the inner wall of the flash evaporation kettle; the cooling assembly is arranged beside the flash evaporation kettle and can be used for recovering and cooling the steam discharged from the steam discharge pipe, so that the inner cavity of the flash evaporation kettle can be automatically cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphoric acid preparation, and specifically to a flash evaporation device for phosphoric acid concentration. Background Art

[0002] In the process of phosphoric acid preparation, a flash evaporation device is often used, such as using a flash evaporation device to concentrate dilute phosphoric acid into concentrated phosphoric acid.

[0003] Normally, a solution is added into the inner cavity of the flash evaporation device, and then the inner cavity of the flash evaporation device is evacuated to form a low pressure inside the device. Under this low pressure, the solution overheats and quickly evaporates into steam, which is the flash evaporation process.

[0004] During the concentration of dilute phosphoric acid, the dilute phosphoric acid is added into the inner cavity of the flash evaporation device. After evacuation, the steam volatilizes under a low pressure state to obtain concentrated phosphoric acid. In this process, the impurities in the dilute phosphoric acid will crystallize and adhere to the inner wall of the device, which will easily lead to a decrease in heating efficiency and affect the normal operation of the device in the long run. Summary of the Invention

[0005] The purpose of the present invention is to provide a flash evaporation device for phosphoric acid concentration. When using this device, dilute phosphoric acid is introduced into the flash evaporation kettle through the solution inlet pipe, and then the inner cavity of the flash evaporation kettle is evacuated through the vacuum extraction pipe to form a low-pressure environment inside the flash evaporation kettle. Then, the flash evaporation kettle is heated, so that the water in the dilute phosphoric acid quickly evaporates under low pressure to obtain concentrated phosphoric acid. When it is necessary to clean the inner wall of the flash evaporation kettle, the motor is started to drive the threaded rod to rotate, driving the wall cleaning ring to move up and down to scrape off the impurities adhering to the inner wall of the flash evaporation kettle. When the threaded rod rotates, it will drive the gear to rotate, driving the collar to rotate, and then driving the bottom scraper to rotate, so that the bottom scraper can also clean the inner wall of the discharge port, enabling automatic cleaning of the inner cavity of the flash evaporation kettle. And the cooling component condenses the steam into water, and collects these waters on the bottom scraper and sprays them on the inner wall of the discharge port, which can increase the cleaning effect.

[0006] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided:

[0007] A flash evaporation device for phosphoric acid concentration, comprising:

[0008] A flash evaporation assembly, including a flash evaporation kettle, symmetrically fixed support frames on the outer wall of the flash evaporation kettle, a vacuum extraction pipe connected to the flash evaporation kettle, a solution inlet pipe connected to the flash evaporation kettle, a steam discharge pipe connected to the top of the flash evaporation kettle, a discharge port connected to the bottom of the flash evaporation kettle, an electromagnetic valve is installed on the discharge port, the outer end of the vacuum extraction pipe is connected to a vacuum pump, and the flash evaporation kettle has a heating function;

[0009] A wall cleaning assembly, arranged on the inner wall of the flash evaporation kettle, capable of cleaning the inner wall of the flash evaporation kettle;

[0010] A driving component that can drive the wall cleaning component to clean the inner wall of the flash evaporation kettle;

[0011] A cooling component is arranged beside the flash evaporation kettle and can recover and cool the steam discharged from the steam discharge pipe.

[0012] As a preferred scheme of a flash evaporation device for phosphoric acid concentration according to the present invention, wherein, the wall cleaning component includes installation grooves symmetrically formed on the inner wall of the flash evaporation kettle, guide rods fixed in the installation grooves, threaded rods rotatably installed in the other installation grooves, motors meshed with the threaded rods, wall cleaning rings placed in the inner cavity of the flash evaporation kettle, nut blocks symmetrically fixed on the wall cleaning rings and sleeved on the guide rods and simultaneously meshed with the threaded rods, and bottom scrapers placed in the inner cavity of the discharge port.

[0013] As a preferred scheme of a flash evaporation device for phosphoric acid concentration according to the present invention, wherein, the driving component includes a bearing fixed on the outer wall of the discharge port, a collar fixed on the outer wall of the bearing, teeth evenly fixed on the collar, and a gear meshed with the teeth. The threaded rod passes through the bottom end of the flash evaporation kettle, the gear is fixed at the bottom end of the threaded rod, and the bottom scraper is fixed on the bottom of the collar.

[0014] As a preferred scheme of a flash evaporation device for phosphoric acid concentration according to the present invention, wherein, the cooling component includes a recovery pipe connected to the steam discharge pipe, a condensation box connected to the recovery pipe, a condensation pipe installed in the inner cavity of the condensation box and connected to the recovery pipe, and a condensed water drain pipe connected to the bottom of the condensation pipe.

[0015] As a preferred scheme of a flash evaporation device for phosphoric acid concentration according to the present invention, wherein, an inclined surface is formed at the bottom of the inner wall of the flash evaporation kettle, and an arc-shaped scraper adapted to the inclined surface is fixed at the top end of the bottom scraper.

[0016] As a preferred scheme of a flash evaporation device for phosphoric acid concentration according to the present invention, wherein, the outer end of the condensed water drain pipe is connected with a water delivery hose, and a first flange is fixed on the water delivery hose.

[0017] As a preferred scheme of a flash evaporation device for phosphoric acid concentration according to the present invention, wherein, cavities are formed inside the bottom scraper and the arc-shaped scraper, a second flange adapted to the first flange is connected to the bottom of the bottom scraper, and water spraying ports are evenly formed on the inner wall of the bottom scraper.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: When using this device, dilute phosphoric acid is introduced into the flash evaporator from the solution inlet pipe, and then the inner cavity of the flash evaporator is evacuated through the vacuum extraction pipe, creating a low-pressure environment inside the flash evaporator. Then, the flash evaporator is heated, causing the water in the dilute phosphoric acid to rapidly evaporate under low pressure, obtaining concentrated phosphoric acid. When it is necessary to clean the inner wall of the flash evaporator, the motor is started to drive the threaded rod to rotate, driving the wall cleaning ring to move up and down to scrape off the impurities adhering to the inner wall of the flash evaporator. When the threaded rod rotates, it will drive the gear to rotate, driving the collar to rotate, thereby driving the bottom scraper to rotate, enabling the bottom scraper to also clean the inner wall of the discharge port, and enabling automatic cleaning of the inner cavity of the flash evaporator. Moreover, the cooling component condenses the steam into water, collects this water onto the bottom scraper, and sprays it onto the inner wall of the discharge port, which can enhance the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the drawings and detailed embodiments. Among them:

[0020] Figure 1 is the overall structural schematic diagram of a flash evaporation device for phosphoric acid concentration according to the present invention;

[0021] Figure 2 is the overall structural sectional view of a flash evaporation device for phosphoric acid concentration according to the present invention;

[0022] Figure 3 is a flash evaporation device for phosphoric acid concentration according to the present invention Figure 1 partial enlarged view of A;

[0023] Figure 4 is the partial structural schematic diagram of the drive assembly of a flash evaporation device for phosphoric acid concentration according to the present invention;

[0024] Figure 5 is the partial structural sectional view of the cooling component of a flash evaporation device for phosphoric acid concentration according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made in conjunction with the drawings.

[0026] The present invention provides a flash evaporation device for phosphoric acid concentration. When in use, dilute phosphoric acid is introduced into the flash evaporation kettle through the solution inlet pipe. Then, the inner cavity of the flash evaporation kettle is evacuated through the vacuum extraction pipe, creating a low-pressure environment inside the flash evaporation kettle. Subsequently, the flash evaporation kettle is heated, causing the water in the dilute phosphoric acid to rapidly evaporate under low pressure to obtain concentrated phosphoric acid. When it is necessary to clean the inner wall of the flash evaporation kettle, the motor is turned on to drive the threaded rod to rotate, driving the wall cleaning ring to move up and down to scrape off the impurities adhering to the inner wall of the flash evaporation kettle. When the threaded rod rotates, it will drive the gear to rotate, driving the collar to rotate, thereby driving the bottom scraper to rotate, enabling the bottom scraper to clean the inner wall of the discharge port as well, achieving automatic cleaning of the inner cavity of the flash evaporation kettle. Moreover, the cooling component condenses the steam into water, collects this water on the bottom scraper, and sprays it on the inner wall of the discharge port, which can enhance the cleaning effect.

[0027] Figures 1 - 5 Shown is a schematic diagram of the overall structure of an embodiment of a flash evaporation device for phosphoric acid concentration according to the present invention. Please refer to Figures 1 - 5 In this embodiment, a flash evaporation device for phosphoric acid concentration mainly includes a flash evaporation component 100, a wall cleaning component 200, a driving component 300, and a cooling component 400.

[0028] The flash evaporation component 100 is used for concentrating dilute phosphoric acid, including a flash evaporation kettle 110, support frames 120 symmetrically fixed on the outer wall of the flash evaporation kettle 110, a vacuum extraction pipe 130 connected to the flash evaporation kettle 110, a solution inlet pipe 140 connected to the flash evaporation kettle 110, a steam discharge pipe 150 connected to the top of the flash evaporation kettle 110, and a discharge port 160 connected to the bottom of the flash evaporation kettle 110. An electromagnetic valve is installed on the discharge port 160. The outer end of the vacuum extraction pipe 130 is connected to an air extraction pump, and the flash evaporation kettle 110 has a heating function.

[0029] The wall cleaning component 200 is used for cleaning the impurities adhering to the inner wall of the flash evaporation kettle 110 and is arranged on the inner wall of the flash evaporation kettle 110. The wall cleaning component 200 includes installation grooves 210 symmetrically opened on the inner wall of the flash evaporation kettle 110, guide rods 220 fixed in the installation grooves 210, a threaded rod 230 rotatably installed in another installation groove 210, a motor 240 meshing with the threaded rod 230, a wall cleaning ring 250 placed in the inner cavity of the flash evaporation kettle 110, nut blocks 250a symmetrically fixed on the wall cleaning ring 250 and sleeved on the guide rods 220 and simultaneously meshing with the threaded rod 230, and a bottom scraper 260 placed in the inner cavity of the discharge port 160.

[0030] The driving component 300 can drive the wall cleaning component 200 to clean the inner wall of the flash evaporation kettle 110; the driving component 300 includes a bearing 310 fixed on the outer wall of the discharge port 160, a collar 320 fixed on the outer wall of the bearing 310, teeth 330 evenly fixed on the collar 320, and a gear 340 meshing with the teeth 330. The threaded rod 230 passes through the bottom end of the flash evaporation kettle 110, the gear 340 is fixed at the bottom end of the threaded rod 230, and the bottom scraper 260 is fixed on the bottom of the collar 320;

[0031] The cooling component 400 is arranged beside the flash evaporation kettle 110 and can recover and cool the steam discharged from the steam discharge pipe 150; the cooling component 400 includes a recovery pipe 410 connected to the steam discharge pipe 150, a condensation box 420 connected to the recovery pipe 410, a condensation pipe 430 installed in the inner cavity of the condensation box 420 and connected to the recovery pipe 410, and a condensed water drain pipe 440 connected to the bottom of the condensation pipe 430.

[0032] Combined Figures 1 - 5 , a flash evaporation device for phosphoric acid concentration in this embodiment is as follows: when using this device, dilute phosphoric acid is introduced into the flash evaporation kettle 110 from the solution inlet pipe 140, and then the inner cavity of the flash evaporation kettle 110 is evacuated from the evacuation pipe 130 to form a low-pressure environment in the inner cavity of the flash evaporation kettle 110. Then, the flash evaporation kettle 110 is heated so that the water in the dilute phosphoric acid evaporates rapidly under low pressure to obtain concentrated phosphoric acid. When it is necessary to clean the inner wall of the flash evaporation kettle 110, the motor 240 is started to drive the threaded rod 230 to rotate, driving the wall cleaning ring 250 to move up and down to scrape off the impurities adhering to the inner wall of the flash evaporation kettle 110. When the threaded rod 230 rotates, it will drive the gear 340 to rotate, driving the collar 320 to rotate, thereby driving the bottom scraper 260 to rotate, so that the inner wall of the discharge port 160 can also be cleaned by the bottom scraper 260, enabling automatic cleaning of the inner cavity of the flash evaporation kettle.

[0033] Furthermore, referring to Figure 2 , an inclined surface 110a is provided at the bottom of the inner wall of the flash evaporation kettle 110, and an arc-shaped scraper 260a adapted to the inclined surface 110a is fixed at the top of the bottom scraper 260, so that the concentrated phosphoric acid can be discharged better, and the arc-shaped scraper 260a can scrape off the impurities adhering to the inclined surface 110a.

[0034] Furthermore, referring to Figure 5, a water delivery hose 450 is connected to the outer end of the condensate drain pipe 440, and a first flange 450a is fixed on the water delivery hose 450; cavities are formed inside the bottom scraper 260 and the arc-shaped scraper 260a, and a second flange 260b adapted to the first flange 450a is connected to the bottom of the bottom scraper 260. Spray nozzles 260c are evenly arranged on the inner wall of the bottom scraper 260, so that the water delivery hose 450 connects the condensate drain pipe 440 and the bottom scraper 260, enabling the bottom scraper 260 to spray water on the inner wall of the flash evaporator 110 during the cleaning process, thereby enhancing the cleaning effect and also recycling the recovered steam.

[0035] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flash evaporation device for concentrating phosphoric acid, characterized in that: include: A flash assembly (100) comprises a flash kettle (110), a support frame (120) symmetrically fixed on the outer wall of the flash kettle (110), a vacuum pipe (130) connected to the flash kettle (110), a solution inlet pipe (140) connected to the flash kettle (110), a steam discharge pipe (150) connected to the top of the flash kettle (110), and a discharge port (160) connected to the bottom of the flash kettle (110), wherein a solenoid valve is installed on the discharge port (160), an outer end of the vacuum pipe (130) is connected to a vacuum pump, and the flash kettle (110) has a heating function; A wall cleaning component (200) is arranged on the inner wall of the flash kettle (110) and can clean the inner wall of the flash kettle (110); A driving component (300) is capable of driving the wall cleaning component (200) to clean the inner wall of the flash kettle (110); The cooling component (400) is arranged beside the flash kettle (110) and can recover and cool the steam discharged from the steam discharge pipe (150).

2. A flash evaporation device for concentrating phosphoric acid according to claim 1, characterized in that: The wall cleaning assembly (200) comprises mounting grooves (210) symmetrically arranged on the inner wall of the flash kettle (110), a guide rod (220) fixed in the mounting groove (210), a threaded rod (230) rotatably mounted in another mounting groove (210), a motor (240) meshed with the threaded rod (230), a wall cleaning ring (250) placed in the inner cavity of the flash kettle (110), a nut block (250a) symmetrically fixed on the wall cleaning ring (250) and sleeved on the guide rod (220) and meshed with the threaded rod (230), and a bottom scraper (260) placed in the inner cavity of the discharge port (160).

3. A flash evaporation device for phosphoric acid concentration according to claim 2, characterized in that: The driving assembly (300) comprises a bearing (310) fixed on the outer wall of the discharge port (160), a collar (320) fixed on the outer wall of the bearing (310), teeth (330) uniformly fixed on the collar (320), and a gear (340) meshing with the teeth (330), the threaded rod (230) passes through the bottom end of the flash kettle (110), the gear (340) is fixed to the bottom end of the threaded rod (230), and the bottom scraper (260) is fixed to the bottom of the collar (320).

4. A flash evaporation device for concentrating phosphoric acid according to claim 1, characterized in that: The cooling assembly (400) includes a recovery pipe (410) connected to the steam exhaust pipe (150), a condenser box (420) connected to the recovery pipe (410), a condenser pipe (430) installed in the inner cavity of the condenser box (420) and connected to the recovery pipe (410), and a condensate drain pipe (440) connected to the bottom of the condenser pipe (430).

5. A flash evaporation device for concentrating phosphoric acid according to claim 1, characterized in that: The bottom of the inner wall of the flash kettle (110) is provided with an inclined surface (110a), and the top end of the bottom scraper (260) is fixed with an arc-shaped scraper (260a) adapted to the inclined surface (110a).

6. A flash evaporation device for concentrating phosphoric acid according to claim 4, characterized in that: The outer end of the condensate drain pipe (440) is connected to a water delivery hose (450), and a first flange (450a) is fixed to the water delivery hose (450).

7. A flash evaporation device for concentrating phosphoric acid according to claim 6, characterized in that: The bottom scraper (260) and the arc scraper (260a) are provided with cavities inside, the bottom of the bottom scraper (260) is connected to a second flange (260b) adapted to the first flange (450a), and water spray ports (260c) are evenly provided on the inner wall of the bottom scraper (260).

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