A waste phosphoric acid recovery evaporator

Abstract

The present invention belongs to the technical field of waste phosphoric acid recovery, and in particular, is a waste phosphoric acid recovery evaporator, comprising an outer box, an inner box, a liquid storage tank, a drive assembly, and a nanofiltration module, wherein the inner box is arranged inside the outer box, the liquid storage tank is arranged on the top of the outer box, a support column is fixedly mounted on the inner wall of the bottom of the outer box, the support column is rotatably mounted on the bottom of the inner box, a liquid inlet pipe and a connecting pipe are fixedly mounted on the top and bottom of the liquid storage tank, respectively, a delivery pipe is fixedly mounted on the support column, the delivery pipe and the connecting pipe are connected to the same mounting cylinder at one end close to each other, the drive assembly is arranged in the mounting cylinder, and the drive assembly is connected to the inner box. The present invention has a reasonable design and is simple to operate. It can not only effectively recover waste phosphoric acid in waste liquid, but also facilitates the replacement of nanofiltration membranes and can reduce the cost of waste phosphoric acid recovery to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of waste phosphoric acid recovery, and in particular to a waste phosphoric acid recovery evaporator. Background Art

[0002] Phosphoric acid, or orthophosphoric acid, with the chemical formula H3PO4 and a molecular weight of 97.9724, is a common, medium-strong inorganic acid. It is primarily used in the pharmaceutical, food, and fertilizer industries, and can also be used as a chemical reagent. Waste phosphoric acid can be recycled. During chemical production, some waste liquids contain waste phosphoric acid. Direct discharge of this waste liquid can pollute the environment and water bodies, and generally requires prior treatment before discharge. While waste phosphoric acid can be recycled and reused, existing equipment for waste phosphoric acid recovery is complex and expensive, resulting in high operating costs. Therefore, the present invention proposes a waste phosphoric acid recovery evaporator to address this issue. Summary of the Invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a waste phosphoric acid recovery evaporator.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A waste phosphoric acid recovery evaporator comprises an outer box, an inner box, a liquid storage tank, a drive assembly and a nanofiltration module;

[0005] The inner box is arranged in the outer box, the liquid storage tank is arranged on the top of the outer box, a support column is fixedly installed on the inner wall of the bottom of the outer box, the support column is rotatably and sealingly installed on the bottom of the inner box, and a liquid inlet pipe and a connecting pipe are fixedly installed on the top and bottom of the liquid storage tank respectively;

[0006] A delivery pipe is fixedly mounted on the support column, and one end of the delivery pipe and the connecting pipe close to each other is connected to the same mounting cylinder, the drive assembly is arranged in the mounting cylinder, the drive assembly is connected to the inner box, the other end of the delivery pipe is connected to the inner box, and the support column and the outer box are fixedly mounted with the same recovery pipe;

[0007] A mounting opening is provided on the top of the outer box, and the nanofiltration module is detachably mounted in the mounting opening. The nanofiltration module is connected to the inner box, and a waste liquid pipe is connected to the nanofiltration module. A plurality of electric heating plates are fixedly mounted on the inner wall of the outer box.

[0008] Preferably, the driving assembly includes a rotating pin, bevel gear 1, bevel gear 2, a rotating rod, an impeller, a horizontal shaft, a driving gear and an upper gear plate. A support bar is fixedly installed on the side wall of the mounting cylinder, and a rotating pin is rotatably installed on the support bar. Both ends of the rotating pin are fixedly sleeved with an impeller and bevel gear 1, a horizontal shaft is rotatably installed on the side wall of the outer box, one end of the horizontal shaft is axially fixedly connected to the rotating rod, and the end of the rotating rod away from the horizontal shaft extends into the mounting cylinder and is fixedly sleeved with bevel gear 2, bevel gear 1 is meshed with bevel gear 2, and the end of the horizontal shaft away from the rotating rod is fixedly sleeved with a driving gear, and the upper gear plate is fixedly installed on the outer circumferential surface of the inner box, and the driving gear is meshed with the upper gear plate.

[0009] Preferably, a plurality of support wheels are rotatably mounted on the inner wall of the outer box, and the plurality of support wheels are all rollingly mounted on the bottom side of the upper gear disc.

[0010] Preferably, the nanofiltration module includes a mounting plate, a conical cover, a nanofiltration membrane, a sealing ring and a connecting cylinder. The mounting plate is fixedly installed in the mounting port by bolts, the connecting cylinder is rotatably installed on the mounting plate, the waste liquid pipe is rotatably sealed and installed on the top of the connecting cylinder, the conical cover is fixedly installed on the bottom end of the connecting cylinder, the nanofiltration membrane is fixedly installed on the inner wall of the conical cover, a circular opening and a sealing groove are opened on the top of the inner box with the support column as the center, the conical cover is connected with the inner box through the circular opening, a sealing ring is fixedly installed on the bottom side of the conical cover, and the sealing ring is movably sealed and installed in the sealing groove.

[0011] Preferably, a guide groove is provided on one side of the outer box, a guide rod is fixedly installed in the guide groove, a guide block is slidably installed on the guide rod, and the waste liquid pipe is rotatably installed on the guide block.

[0012] Preferably, the recovery pipe is U-shaped, one end of the recovery pipe extends to a position close to the side wall of the inner box and is provided with a plurality of through holes, and the other end of the recovery pipe extends to the outside of the outer box and is fixedly installed with a control valve.

[0013] Preferably, one end of the delivery pipe away from the installation cylinder extends into the inner box and is fixedly installed with a plurality of U-shaped tubes, and each of the plurality of U-shaped tubes is provided with a liquid inlet hole.

[0014] Preferably, a support frame is fixedly installed on the top of the outer box, the liquid storage tank is fixedly installed on the support frame, two arc plates are fixedly installed on one side of the outer box, the liquid inlet pipe is fixedly connected to the support frame and the two arc plates, and the connecting pipe and the delivery pipe are respectively fixedly connected to the corresponding arc plates.

[0015] The beneficial effects of the present invention are as follows: in the present invention, by arranging the liquid storage tank above the outer box, the potential energy of water can be utilized to allow the waste liquid to enter the inner box, and under the action of the nanofiltration module, the waste phosphoric acid in the waste liquid can be intercepted, so that the waste water can be discharged from the waste liquid pipe, thereby increasing the concentration of the waste phosphoric acid in the waste liquid in the inner box, heating the inner box by the electric heating plate and boiling the water, so that the water can quickly pass through the nanofiltration module, thereby improving the efficiency of waste phosphoric acid recovery, and when the waste liquid passes through the installation cylinder through the connecting pipe, the drive assembly can be controlled to operate, thereby controlling the rotation of the inner box, thereby enabling the waste phosphoric acid with relatively high density to be concentrated on the side walls and bottom inner wall of the inner box under the action of centrifugal force, facilitating the recovery of waste phosphoric acid with higher concentration through the recovery pipe, and through the cooperation of the delivery pipe, the U-shaped tube, and the multiple liquid inlet holes on the U-shaped tube, the waste liquid can enter from the upper side when it is delivered to the inner box, thereby reducing the impact and disturbance on the side walls and bottom inner wall of the inner box, thereby improving the recovery concentration of the waste phosphoric acid in the recovery pipe.

[0016] In the present invention, the liquid inlet pipe is closed and the bolt is removed using a wrench, and then the guide block is pushed upward to enable the waste liquid pipe to drive the connecting cylinder to move the conical cover upward synchronously, and at the same time the sealing ring is disengaged from the sealing groove, so that the nanofiltration module can be taken out from the installation port, and then the waste liquid pipe is controlled to rotate to move the nanofiltration module away from the top of the outer box, thereby facilitating the replacement operation of the nanofiltration membrane on the nanofiltration module.

[0017] The invention has reasonable structural design and simple operation, and can not only effectively recover waste phosphoric acid in waste liquid, but also facilitate the replacement of the nanofiltration membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a waste phosphoric acid recovery evaporator proposed by the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of a waste phosphoric acid recovery evaporator proposed by the present invention;

[0021] Figure 3 This is a schematic cross-sectional view of the drive assembly and mounting barrel portion proposed in the present invention;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the nanofiltration module proposed in the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the recovery pipe and control valve proposed in the present invention;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the nanofiltration module, waste liquid pipe, guide rod and guide block part proposed in the present invention;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the mounting plate and bolt part proposed by the present invention;

[0026] Figure 8 This is a schematic diagram of the three-dimensional structure of the connecting pipe, installation tube, delivery pipe and multiple U-shaped pipe parts proposed by the present invention;

[0027] Figure 9 This is a schematic structural diagram of part A in a waste phosphoric acid recovery evaporator proposed by the present invention.

[0028] In the figure: 1. outer box; 11. support column; 12. electric heating plate; 13. support wheel; 14. upper gear disc; 2. inner box; 3. liquid storage tank; 31. liquid inlet pipe; 32. mounting cylinder; 321. support bar; 322. rotating pin; 323. bevel gear 1; 324. impeller; 325. rotating rod; 326. bevel gear 2; 327. horizontal axis; 328. driving gear; 33. conveying pipe; 34. U-shaped pipe; 4. connecting cylinder; 41. mounting plate; 42. conical cover; 43. nanofiltration membrane; 44. sealing ring; 45. waste liquid pipe; 46. guide groove; 47. guide rod; 48. guide block; 5. recovery pipe; 51. through hole. DETAILED DESCRIPTION

[0029] The technical solutions of the present invention will be described clearly and completely below with reference to specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0030] Reference Figure 1-9A waste phosphoric acid recovery evaporator comprises an outer box 1, an inner box 2 and a liquid storage tank 3. The inner box 2 is arranged in the outer box 1, and the liquid storage tank 3 is arranged on the top of the outer box 1. A support column 11 is fixedly installed on the inner wall of the bottom of the outer box 1. The support column 11 is rotatably sealed and installed at the bottom of the inner box 2. A liquid inlet pipe 31 and a connecting pipe are fixedly installed on the top and bottom of the liquid storage tank 3, respectively. A delivery pipe 33 is fixedly installed on the support column 11. The end of the delivery pipe 33 and the connecting pipe close to each other is connected to the same mounting cylinder 32. A support bar 321 is fixedly installed on the side wall of the mounting cylinder 32. A rotating pin 322 is rotatably installed on the support bar 321. The two ends of the rotating pin 322 are fixedly sleeved with an impeller 324 and a bevel gear 323, respectively. A horizontal The shaft 327 has one end fixedly connected to the rotating rod 325 in the axial direction, and the rotating rod 325 extends into the mounting cylinder 32 at one end away from the horizontal shaft 327 and is fixedly sleeved with a bevel gear 2 326. The bevel gear 1 323 meshes with the bevel gear 2 326. The end of the horizontal shaft 327 away from the rotating rod 325 is fixedly sleeved with a driving gear 328. An upper gear disc 14 is fixedly mounted on the outer circumference of the inner box 2. The driving gear 328 meshes with the upper gear disc 14. When the recovered liquid containing phosphoric acid in the liquid storage tank 3 is transported to the delivery pipe 33 through the connecting pipe via the mounting cylinder 32, the inner box 2 is driven to rotate. As a result, the waste phosphoric acid with a larger density can be moved toward the side wall of the inner box 2 under the action of centrifugal force. The delivery pipe 33 is away from one end of the mounting cylinder 32. The end extends into the inner box 2 and is fixedly installed with multiple U-shaped tubes 34. A liquid inlet hole is provided on each of the multiple U-shaped tubes 34 to facilitate the dispersed transportation of the recovered liquid containing phosphoric acid into the inner box 2. The support column 11 and the outer box 1 are fixedly installed with the same recovery pipe 5. The recovery pipe 5 is U-shaped, and one end of the recovery pipe 5 extends to a position close to the side wall of the inner box 2 and is provided with multiple through holes 51. The other end of the recovery pipe 5 extends to the outside of the outer box 1 and is fixedly installed with a control valve. A mounting port is provided at the top of the outer box 1, and a mounting plate 41 is fixedly installed in the mounting port by bolts. A connecting cylinder 4 is rotatably installed on the mounting plate 41, and a waste liquid pipe 45 is rotatably sealed on the top of the connecting cylinder 4. A conical cover 42 is fixedly installed on the bottom end of the connecting cylinder 4, and a conical cover 42 is fixedly installed on the inner wall of the conical cover 42. A nanofiltration membrane 43 is installed. A circular opening and a sealing groove are opened on the top of the inner box 2 based on the support column 11 as the center. The conical cover 42 is connected to the inner box 2 through the circular opening. A sealing ring 44 is fixedly installed on the bottom side of the conical cover 42. The sealing ring 44 is movably sealed and installed in the sealing groove, which can intercept and filter the phosphoric acid in the recovery liquid containing phosphoric acid to prevent the phosphoric acid from being discharged upward through the mounting cylinder 32. At the same time, the connecting cylinder 4 is conveniently disassembled and assembled under the action of the mounting plate 41 mounted on the mounting opening by bolts, thereby facilitating the replacement operation of the nanofiltration membrane 43. A plurality of electric heating plates 12 are fixedly installed on the inner wall of the outer box 1. The plurality of electric heating plates 12 are all arranged in an arc shape, and the plurality of electric heating plates 12 are all in movably contact with the outer wall of the inner box 2, which is convenient for heating the inner box 2.

[0031] In this embodiment, a plurality of support wheels 13 are rotatably mounted on the inner wall of the outer box 1. The plurality of support wheels 13 are all rollingly mounted on the bottom side of the upper gear wheel 14, which can provide stable support for the inner box 2, thereby enabling the inner box 2 to maintain stable rotation.

[0032] In this embodiment, a guide groove 46 is provided on one side of the outer box 1, a guide rod 47 is fixedly installed in the guide groove 46, a guide block 48 is slidably installed on the guide rod 47, and the waste liquid pipe 45 is rotatably installed on the guide block 48, which can guide the waste liquid pipe 45 and facilitate its removal from the installation port after the connecting tube 4 is disassembled.

[0033] In this embodiment, a support frame is fixedly installed on the top of the outer box 1, and the liquid storage tank 3 is fixedly installed on the support frame. Two arc-shaped plates are fixedly installed on one side of the outer box 1. The liquid inlet pipe 31 is fixedly connected to the support frame and the two arc-shaped plates. The connecting pipe and the delivery pipe 33 are fixedly connected to the corresponding arc-shaped plates respectively, which can provide stable support for the liquid inlet pipe 31, the delivery pipe 33, the connecting pipe and the liquid storage tank 3, and at the same time can maintain good stability.

[0034] In this embodiment, a liquid inlet valve is fixedly installed on the liquid inlet pipe 31, and a pressure relief pipe (not shown in the figure) is fixedly installed on the top of the liquid storage tank 3. The pressure relief pipe can maintain pressure balance in the liquid storage tank 3, and the waste liquid can be transported only by relying on the potential energy of the waste liquid in the liquid storage tank 3, thereby reducing energy consumption.

[0035] Working principle: When in use, first connect the energy source, and transport the recovered liquid containing phosphoric acid to be recycled from the liquid inlet pipe 31 to the liquid storage tank 3. Under the action of gravitational potential energy, the waste liquid in the liquid storage tank 3 can pass through the connecting pipe, the installation cylinder 32 and the delivery pipe 33 into the inner box 2, and is dispersed and transported to the inner box 2 under the action of the U-shaped tubes 34. The inner box 2 is heated by the electric heating plate 12 to boil the water in the waste liquid, so that the water can quickly pass through the nanofiltration module, thereby improving the efficiency of waste phosphoric acid recovery. When the waste liquid passes through the installation cylinder 32, it can drive the impeller 324 to drive the rotating pin 322 to rotate, under the action of the bevel gear 1 323, the bevel gear 2 326, the rotating rod 325 and the horizontal shaft 327. The lower gear 328 can be controlled to rotate, and the rotation of the inner box 2 can be controlled in cooperation with the upper gear disc 14. As the inner box 2 rotates, the waste phosphoric acid liquid with higher density can be moved closer to the side wall of the inner box 2 under the action of centrifugal force. At the same time, the water in the waste liquid gathers near the central axis of the inner box 2. As the waste liquid continuously enters the inner box 2, the water in the waste liquid is filtered upward under the action of the nanofiltration membrane 43, so that the waste phosphoric acid can be intercepted. The waste water is discharged from the connecting cylinder 4 through the waste liquid pipe 45. As the concentration of the waste phosphoric acid in the inner box 2 increases, the waste phosphoric acid is located in the middle and lower position of the inner box 2. The control valve on the recovery pipe 5 is opened to discharge the waste phosphoric acid with higher concentration from the bottom inner wall of the inner box 2 and collect it in other containers.

[0036] When the nanofiltration membrane 43 needs to be replaced, the liquid inlet pipe 31 is closed through the liquid inlet valve, and the waste liquid in the liquid storage tank 3 stops flowing. The bolts on the mounting plate 41 are removed with a wrench, and then the guide block 48 is controlled to slide upward along the guide groove 46, so that the waste liquid pipe 45 drives the conical cover 42 to move upward through the connecting tube 4, so that the sealing ring 44 is disengaged from the sealing groove. After the conical cover 42 and the sealing ring 44 move to the top of the outer box 1, the waste liquid pipe 45 is rotated to remove the connecting tube 4 and the conical cover 42 from the top of the outer box 1, and then the guide block 48 is loosened to make the waste liquid pipe 45 move downward, thereby facilitating the replacement operation of the nanofiltration membrane 43.

[0037] The above describes in detail the waste phosphoric acid recovery evaporator provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art will be able to make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the claims.

Claims

1. A waste phosphoric acid recovery evaporator, characterized in that: It comprises an outer box (1), an inner box (2), a liquid storage tank (3), a drive assembly and a nanofiltration module; The inner box (2) is arranged in the outer box (1), the liquid storage tank (3) is arranged on the top of the outer box (1), a support column (11) is fixedly installed on the inner wall of the bottom of the outer box (1), and the support column (11) is rotatably sealed and installed on the bottom of the inner box (2), and a liquid inlet pipe (31) and a connecting pipe are fixedly installed on the top and bottom of the liquid storage tank (3) respectively; A delivery pipe (33) is fixedly mounted on the support column (11), and one end of the delivery pipe (33) and the connecting pipe close to each other is connected to the same mounting cylinder (32). The drive assembly is arranged in the mounting cylinder (32), and the drive assembly is connected to the inner box (2). The other end of the delivery pipe (33) is connected to the inner box (2). The end of the delivery pipe (33) away from the mounting cylinder (32) extends into the inner box (2) and is fixedly mounted with a plurality of U-shaped pipes (34), and the plurality of U-shaped pipes (34) are all provided with liquid inlet holes. The support column (11) and the outer box (1) are fixedly mounted with the same recovery pipe (5); The outer box (1) has an installation opening at the top, the nanofiltration module is detachably installed in the installation opening, and the nanofiltration module is connected to the inner box (2). A waste liquid pipe (45) is connected to the nanofiltration module, and a plurality of electric heating plates (12) are fixedly installed on the inner wall of the outer box (1); The driving assembly comprises a rotating pin (322), a bevel gear 1 (323), a bevel gear 2 (326), a rotating rod (325), an impeller (324), a transverse shaft (327), a driving gear (328) and an upper gear disc (14); a support bar (321) is fixedly mounted on the side wall of the mounting cylinder (32); a rotating pin (322) is rotatably mounted on the support bar (321); an impeller (324) and a bevel gear 1 (323) are fixedly sleeved on both ends of the rotating pin (322); a transverse shaft is rotatably mounted on the side wall of the outer box (1); (327), one end of the transverse shaft (327) is axially fixedly connected to a rotating rod (325), one end of the rotating rod (325) away from the transverse shaft (327) extends into the mounting tube (32) and is fixedly sleeved with a bevel gear 2 (326), the bevel gear 1 (323) is meshed with the bevel gear 2 (326), the end of the transverse shaft (327) away from the rotating rod (325) is fixedly sleeved with a driving gear (328), an upper gear disc (14) is fixedly mounted on the outer peripheral surface of the inner box (2), and the driving gear (328) is meshed with the upper gear disc (14); A plurality of support wheels (13) are rotatably mounted on the inner wall of the outer box (1), and the plurality of support wheels (13) are all rollingly mounted on the bottom side of the upper gear disc (14); The nanofiltration module comprises a mounting plate (41), a conical cover (42), a nanofiltration membrane (43), a sealing ring (44) and a connecting tube (4); the mounting plate (41) is fixedly installed in the mounting port by bolts; the connecting tube (4) is rotatably installed on the mounting plate (41); the waste liquid pipe (45) is rotatably sealed and installed on the top of the connecting tube (4); the conical cover (42) is fixedly installed on the bottom end of the connecting tube (4); the nanofiltration membrane (43) is fixedly installed on the inner wall of the conical cover (42); a circular opening and a sealing groove are opened on the top of the inner box (2) based on the support column (11); the conical cover (42) is connected to the inner box (2) through the circular opening; a sealing ring (44) is fixedly installed on the bottom side of the conical cover (42); and the sealing ring (44) is movably sealed and installed in the sealing groove; A guide groove (46) is provided on one side of the outer box (1), a guide rod (47) is fixedly installed in the guide groove (46), a guide block (48) is slidably installed on the guide rod (47), and the waste liquid pipe (45) is rotatably installed on the guide block (48).

2. The waste phosphoric acid recovery evaporator according to claim 1, characterized in that: The recovery pipe (5) is arranged in a U shape, one end of the recovery pipe (5) extends to a position close to the side wall of the inner box (2) and is provided with a plurality of through holes (51), and the other end of the recovery pipe (5) extends to the outside of the outer box (1) and is fixedly installed with a control valve.

3. The waste phosphoric acid recovery evaporator according to claim 1, characterized in that: A support frame is fixedly mounted on the top of the outer box (1), and the liquid storage tank (3) is fixedly mounted on the support frame. Two arc-shaped plates are fixedly mounted on one side of the outer box (1). The liquid inlet pipe (31) is fixedly connected to the support frame and the two arc-shaped plates, and the connecting pipe and the delivery pipe (33) are respectively fixedly connected to the corresponding arc-shaped plates.

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