A process for evaporation crystallization of high-salt wastewater containing iron phosphate

Abstract

The present invention relates to the technical field of high-salt wastewater of iron phosphate, and discloses an evaporation crystallization process for high-salt wastewater of iron phosphate, which includes a tank heat exchanger. The tank heat exchanger includes an evaporation tank and a plurality of heat exchange tubes for heating the high-salt wastewater of iron phosphate. The heights of the plurality of heat exchange tubes in the evaporation tank are inconsistent, and one end of the evaporation tank is also provided with a control component for independently controlling the participation of the plurality of heat exchange tubes in heat exchange. The control component includes a cylindrical valve lifted on the corresponding water inlet pipe through an adjustment rope, and a balloon located on the liquid surface in the evaporation tank. The balloon can drive the corresponding adjustment rope to lift and lower synchronously, and the adjustment rope is located on one side of the corresponding water injection pipe and is adapted to the inner diameter size of the corresponding water injection pipe. One end of the heat exchange tube is installed on a vibration component capable of driving the heat exchange tube to jolt. The vibration component includes an upper chuck and a lower chuck connected to each other through a vibration spring. Compared with the prior art, this application solves a series of problems such as energy consumption waste in the prior art for high-salt wastewater of iron phosphate.

Description

Technical Field

[0001] The present invention relates to the technical field of high-salt wastewater of iron phosphate, and particularly to an evaporation and crystallization process for high-salt wastewater of iron phosphate. Background Art

[0002] Evaporation and crystallization devices are widely used in wastewater treatment in industries such as the chemical industry, non-ferrous metal industry, pesticide industry, food industry, pharmaceutical industry, ammonia desulfurization, mine smelting, steel mills, and oil fields. By recovering crystals in wastewater, pure environmental protection treatment and up-to-standard discharge are deepened into environmental protection treatment and comprehensive utilization. Ammonium chloride, potassium chloride, high-salt wastewater of iron phosphate, etc. in wastewater are crystallized and recycled.

[0003] In the prior art, a forced-circulation ammonium sulfate evaporation and crystallization device is proposed in the Chinese patent document with the publication number CN204841011U. Although it can use a high-head centrifugal pump to improve the operation speed and productivity of equipment in a two-effect evaporation and crystallization process, and can increase the concentration of ammonium sulfate in the crystal slurry, and more solids can be collected after centrifugal separation, in actual use, it does not have a higher economic effect than traditional evaporation crystallization equipment. When traditional evaporation crystallization equipment is used for ammonium sulfate evaporation and crystallization, heat transfer for ammonium sulfate evaporation and crystallization is mostly carried out by using heat exchange pipelines or other heat exchange equipment to achieve the crystallization purpose. Such an operation method is likely to cause heat waste in the upper heat exchange pipelines when the ammonium sulfate level is low, thus increasing energy consumption and not having good economic benefits. In addition, crystallization products are likely to adhere to the heat exchange pipelines in existing heat exchange equipment, thus affecting subsequent heat transfer. Therefore, the present application discloses an evaporation and crystallization process for high-salt wastewater of iron phosphate to meet the high-efficiency heat exchange and crystallization requirements of high-salt wastewater of iron phosphate. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an evaporation and crystallization process for high-salt wastewater of iron phosphate, which has the advantages of optimizing the effect of high-salt wastewater of iron phosphate, etc., and solves a series of problems such as low efficiency of high-salt wastewater of iron phosphate in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: An evaporation and crystallization process for high-salt wastewater of iron phosphate, comprising the following steps:

[0006] S1. The raw material passes through the raw material pump from the raw material tank to recover the sensible heat of the condensate through a preheater. First, a part of the raw material is pumped into the circulation pipe of the separation chamber and enters the evaporation chamber for evaporation, and the other part enters the crystallizer;

[0007] S2. The solution in the evaporation chamber descends to the bottom of the evaporator, and then is pumped into the tank-type heat exchanger through a steam compressor to be heated and crystallized;

[0008] In the process of evaporating the high-salt iron phosphate wastewater by adopting the above steps, a shell-and-tube heat exchanger is specifically involved. The shell-and-tube heat exchanger includes an evaporation tank provided with a feeding end and a discharging end, and a plurality of heat exchange tubes for heating the high-salt iron phosphate wastewater. The heights of the plurality of heat exchange tubes in the evaporation tank are inconsistent, and one end of the evaporation tank is further provided with a control component for independently controlling the plurality of heat exchange tubes to participate in heat exchange. The control component includes a cylindrical valve lifted on a corresponding water inlet pipe by an adjusting rope, and a balloon located on the liquid surface in the evaporation tank. The balloon can drive the corresponding adjusting rope to lift and lower synchronously, and the adjusting rope is located on one side of the corresponding water injection pipe and is adapted to the inner diameter size of the corresponding water injection pipe. One end of the heat exchange tube is installed on a vibration component capable of driving the heat exchange tube to jolt. The vibration component includes an upper chuck and a lower chuck connected to each other by a vibration spring.

[0009] Preferably, one end of the evaporation tank is connected with a heat exchange tank coaxially arranged therewith through a flange plate, and the heat exchange tubes are placed on the bottom end in the evaporation tank through a plurality of mounting plates.

[0010] Preferably, both the upper chuck and the lower chuck are sleeved in one end of the evaporation tank, and both ends of the heat exchange tube respectively penetrate through the corresponding upper chuck or lower chuck. A water inlet pipe and a water outlet pipe corresponding in position are further arranged in the heat exchange tank. A plurality of connecting pipes are communicated with both the water inlet pipe and the water outlet pipe, and the other ends of the connecting pipes are sleeved in one end of the corresponding heat exchange tube.

[0011] Preferably, a partition plate for isolating the water inlet pipe and the water outlet pipe is further installed in the heat exchange tank, and a water inlet end and a water drainage end are further installed on the heat exchange tank. The plurality of water inlet pipes are located in different vertical planes and are respectively provided with communicating water injection pipes. The plurality of water inlet pipes are all located above the partition plate, and a drainage pipe is further communicated with the water outlet pipe.

[0012] Preferably, a vertical pipe is further communicated with the water inlet pipe. The cylindrical valve is slidably sleeved in the corresponding vertical pipe, and a fixing plate is further sleeved on the top end of the vertical pipe. A common vertical spring is connected between the fixing plate and the top end of the cylindrical valve.

[0013] Preferably, the cylindrical valve at the lowest position rises to the height of the corresponding water injection pipe first, and when the subsequent cylindrical valves reach the adapted height of the established water injection pipe, the cylindrical valve that rises first can still block the corresponding water injection pipe.

[0014] Preferably, a vertical guide rod is further installed on the inner wall of the evaporation tank. A floating plate is slidably sleeved on the vertical guide rod. The balloon is installed at the bottom of the floating plate, and a traction rope is connected to the top of the floating plate. The other end of the traction rope passes around a reversing roller and then penetrates outside the evaporation tank and is connected with a hanging ring. One end of the adjusting rope penetrates through the heat exchange tank and is connected with the hanging ring through a pull ring.

[0015] Preferably, an arc-shaped seat is further installed on the outer wall of the heat exchange tank. A plurality of guide rods with different heights are installed on the arc-shaped seat. One end of each of the plurality of adjusting ropes passes around the corresponding guide rod and is connected to the same pull ring.

[0016] Preferably, both the upper chuck and the lower chuck are in the shape of incomplete discs, and an arc-shaped base located below the lower chuck is sleeved at one end of the evaporation tank. The outer wall of the arc-shaped base is attached to the inner wall of one end of the evaporation tank, and sliding rods are provided between the upper chuck and the lower chuck and between the lower chuck and the arc-shaped base. The lower chuck and the arc-shaped base are respectively slidably sleeved on the corresponding sliding rods.

[0017] Preferably, the vibration spring is sleeved on the corresponding sliding rod, and installation grooves corresponding to each other in position are formed at the bottom of the upper chuck and the top of the lower chuck. Two ends of the vibration spring are respectively connected in the corresponding installation grooves.

[0018] Compared with the prior art, the present invention provides a process for evaporative crystallization of high-salt iron phosphate wastewater, having the following beneficial effects:

[0019] 1. In this process for evaporative crystallization of high-salt iron phosphate wastewater, a heat source is input into the inlet pipe through the water inlet end and the corresponding water injection pipe, and then the heat source is conveyed into the heat exchange pipe through the connecting pipe. Then, the heat exchange pipe is used to heat and evaporate the high-salt iron phosphate wastewater to make it crystallize. During the continuous evaporation process, as the liquid level of the high-salt iron phosphate wastewater in the evaporation tank gradually decreases, under the action of gravity, the balloon and the floating plate descend, and the columnar valve at the corresponding height is synchronously pulled up through the traction rope and the adjusting rope. Thus, when the liquid level is lower than the height of the corresponding heat exchange pipe, the corresponding columnar valve just rises to the height of the corresponding water injection pipe to close the input end of the heat exchange pipe, so as to control the circulation heat exchange of the heat exchange pipes at different heights. In this way, the operation of the heat exchange pipes at the corresponding heights can be correspondingly controlled according to the height of the high-salt iron phosphate wastewater in the evaporation tank, thereby avoiding the waste of energy consumption caused by the continuous operation of the heat exchange pipes above the liquid level, achieving energy conservation and emission reduction, and improving the economic benefits when treating high-salt iron phosphate wastewater.

[0020] 2. The evaporation and crystallization process of high-salt iron phosphate wastewater uses manual and intermittent lifting of the pull ring to make the adjustment ropes at different positions shrink toward the middle, thereby compressing the vertical springs at different positions until the water inlet pipes at the corresponding positions are driven to rise through the fixed plate. At the same time, with the elastic force of the vibration spring and the guiding effect of the slide bar, the heat exchange tubes at different positions can be synchronously bumped to shake off the crystal attachments on the surface into the evaporation tank, thereby achieving the purpose of regularly cleaning the evaporation tank and the heat exchange tubes, which can not only ensure the heat exchange efficiency, optimize the evaporation and crystallization effect, but also improve the crystal purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the cutaway three-dimensional structure of the evaporator of the present invention;

[0023] Figure 3 This is a schematic diagram of the side structure of the heat exchange tank of the present invention;

[0024] Figure 4 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the cutaway three-dimensional structure of the vertical tube of the present invention;

[0026] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the upper chuck and the lower chuck of the present invention.

[0028] In the figure: 1. evaporator; 2. heat exchanger; 3. mounting plate; 4. heat exchange tube; 5. upper chuck; 6. lower chuck; 7. water inlet pipe; 8. water outlet pipe; 9. partition; 10. water inlet end; 11. drainage end; 12. connecting pipe; 13. vertical pipe; 14. drainage pipe; 15. vertical guide rod; 16. floating plate; 17. balloon; 18. traction rope; 19. adjustment rope; 20. pull ring; 21. columnar valve; 22. vertical spring; 23. arc seat; 24. guide rod; 25. water injection pipe; 26. arc base; 27. mounting groove; 28. vibration spring. Implementation

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a process for evaporative crystallization of high-salt wastewater containing iron phosphate.

[0031] In a typical embodiment of the present application, as Figures 1-7 shown, a process for evaporative crystallization of high-salt wastewater containing iron phosphate includes the following steps:

[0032] S1. The raw materials are pumped from the raw material tank through the raw material pump to recover the sensible heat of the condensate through the preheater. First, part of the raw materials are pumped by the raw material pump into the circulation pipe of the separation chamber, and part of them enter the evaporation chamber for evaporation, while the other part enters the crystallizer;

[0033] S2. The solution in the evaporation chamber descends to the bottom of the evaporator and then is pumped into the tank heat exchanger through the steam compressor for heating and crystallization;

[0034] During the process of evaporating the high-salt iron phosphate wastewater using the above steps, it specifically involves a shell-and-tube heat exchanger. The shell-and-tube heat exchanger includes an evaporation tank 1 with a charging end and a discharging end, and a plurality of heat exchange tubes 4 for heating the high-salt iron phosphate wastewater. The heights of the plurality of heat exchange tubes 4 in the evaporation tank 1 are inconsistent, and one end of the evaporation tank 1 is also provided with a control component for independently controlling the participation of the plurality of heat exchange tubes 4 in heat exchange. The control component includes a cylindrical valve 21 lifted on the corresponding water inlet pipe 7 through an adjusting rope 19, and a balloon 17 located on the liquid surface in the evaporation tank 1. The balloon 17 can drive the corresponding adjusting rope 19 to lift and lower synchronously, and the adjusting rope 19 is located on one side of the corresponding water injection pipe 25 and is adapted to the inner diameter size of the corresponding water injection pipe 25. One end of the heat exchange tube 4 is installed on a vibration component that can drive the heat exchange tube 4 to jolt. The vibration component includes an upper chuck 5 and a lower chuck 6 connected to each other through a vibration spring 28. After injecting the high-salt iron phosphate wastewater into the evaporation tank 1, a heat source is input into the plurality of heat exchange tubes 4 through the water inlet pipe 7, and then the heat exchange tubes 4 are used to heat and evaporate the high-salt iron phosphate wastewater to make it crystallize. During the continuous evaporation process, as the liquid level of the high-salt iron phosphate wastewater in the evaporation tank 1 gradually decreases, the balloon 17 can synchronously pull the cylindrical valve 21 at the corresponding height to rise through the adjusting rope 19. Thus, when the liquid level is lower than the height of the corresponding heat exchange tube 4, the corresponding cylindrical valve 21 is exactly at the height of the corresponding water injection pipe 25, closing the input end of the heat exchange tube 4, thereby controlling the circulation heat exchange of the heat exchange tubes 4 at different heights. In this way, it is possible to correspondingly control the operation of the heat exchange tubes 4 at the corresponding heights according to the height of the high-salt iron phosphate wastewater in the evaporation tank 1, thereby avoiding energy consumption waste caused by the continuous operation of the heat exchange tubes 4 above the liquid level, achieving energy conservation and emission reduction. At the same time, after the heat exchange tubes 4 are used for a period of time, a scaling phenomenon will occur on the surface of the heat exchange tubes 4. At this time, by manually intermittently lifting the adjusting ropes 19 at different positions and cooperating with the interaction of the vibration component, the heat exchange tubes 4 at different positions can jolt synchronously, shaking off the crystal attachments on the surface into the evaporation tank 1, thereby achieving the purpose of regularly cleaning the evaporation tank 1 and the heat exchange tubes 4, which can not only ensure the heat exchange efficiency, optimize the evaporation crystallization effect, but also improve the crystallization purity.

[0035] As a preferred implementation method in this embodiment, refer to the attached Figures 2-6, one end of the evaporation tank 1 is connected with a heat exchange tank 2 arranged coaxially therewith through a flange. The heat exchange tubes 4 are placed on the bottom end inside the evaporation tank 1 through a plurality of mounting plates 3. The upper chuck 5 and the lower chuck 6 are both sleeved inside one end of the evaporation tank 1, and both ends of the heat exchange tubes 4 respectively penetrate through the corresponding upper chuck 5 or lower chuck 6. A water inlet pipe 7 and a water outlet pipe 8 with corresponding positions are also arranged inside the heat exchange tank 2. A plurality of connecting pipes 12 are communicated on both the water inlet pipe 7 and the water outlet pipe 8. The other end of the connecting pipe 12 is sleeved inside one end of the corresponding heat exchange tube 4. A partition plate 9 for isolating the water inlet pipe 7 and the water outlet pipe 8 is also installed inside the heat exchange tank 2. An inlet end 10 and a drainage end 11 are also installed on the heat exchange tank 2. A plurality of water inlet pipes 7 are located on different vertical planes and are all provided with communicating water injection pipes 25. A plurality of water inlet pipes 7 are all above the partition plate 9. A drainage pipe 14 is also communicated on the water outlet pipe 8. A vertical pipe 13 is also communicated on the water inlet pipe 7. A cylindrical valve 21 is slidably sleeved inside the corresponding vertical pipe 13, and a fixed disk is also sleeved at the top end of the vertical pipe 13. A common vertical spring 22 is connected between the fixed disk and the top end of the cylindrical valve 21. The cylindrical valve 21 at the lowest position preferentially rises to the height of the corresponding water injection pipe 25, and when the subsequent cylindrical valve 21 reaches the adapted height of the established water injection pipe 25, the preferentially rising cylindrical valve 21 can still block the corresponding water injection pipe 25. A vertical guide rod 15 is also installed on the inner wall of the evaporation tank 1. A floating plate 16 is slidably sleeved on the vertical guide rod 15. A spherical balloon 17 is installed at the bottom of the floating plate 16, and a traction rope 18 is connected to the top of the floating plate 16. The other end of the traction rope 18 bypasses a reversing roller and then penetrates outside the evaporation tank 1 and is connected with a hanging ring. One end of an adjusting rope 19 penetrates through the heat exchange tank 2 and is connected with the hanging ring through a pull ring 20. When it is necessary to crystallize the high-salt ferric phosphate wastewater, after injecting the high-salt ferric phosphate wastewater into the evaporation tank 1, a heat source is input into the water inlet pipe 7 through the inlet end 10 and the corresponding water injection pipe 25, and then the heat source is conveyed into the heat exchange tubes 4 through the connecting pipes 12. Then, the heat exchange tubes 4 are used to heat and evaporate the high-salt ferric phosphate wastewater to make it crystallize. During the continuous evaporation process, as the liquid level of the high-salt ferric phosphate wastewater in the evaporation tank 1 gradually decreases, under the action of gravity, the spherical balloon 17 and the floating plate 16 descend, and the cylindrical valve 21 at the corresponding height is synchronously pulled to rise through the traction rope 18 and the adjusting rope 19. Thus, when the liquid level is lower than the height of the corresponding heat exchange tube 4, the corresponding cylindrical valve 21 just rises to the height of the corresponding water injection pipe 25 to close the input end of the heat exchange tube 4, so as to control the circulation heat exchange of the heat exchange tubes 4 at different heights. In this way, it is possible to correspondingly control the operation of the heat exchange tubes 4 at the corresponding heights according to the height of the high-salt ferric phosphate wastewater in the evaporation tank 1, thereby avoiding energy consumption waste caused by the continuous operation of the heat exchange tubes 4 above the liquid level, achieving energy conservation and emission reduction, and improving the economic benefits when treating the high-salt ferric phosphate wastewater.

[0036] As a preferred implementation manner in this embodiment, refer to the attached Figure 3 , 4, an arc-shaped seat 23 is also installed on the outer wall of the heat exchange tank 2. A plurality of guide rods 24 with different heights are installed on the arc-shaped seat 23. One ends of a plurality of adjusting ropes 19 bypass the corresponding guide rods 24 and are connected to the same pull ring 20. By providing a plurality of guide rods 24, the dislocation phenomenon of the adjusting ropes 19 during movement is avoided, and the control accuracy of controlling the corresponding cylindrical valve 21 through the adjusting ropes 19 is improved.

[0037] As a preferred implementation manner in this embodiment, refer to the attached Figure 2 , 7 , both the upper chuck 5 and the lower chuck 6 are in the shape of incomplete disks. One end of the evaporation tank 1 is also sleeved with an arc-shaped base 26 located below the lower chuck 6. The outer wall of the arc-shaped base 26 is attached to the inner wall of one end of the evaporation tank 1. Slide rods are provided between the upper chuck 5 and the lower chuck 6 and between the lower chuck 6 and the arc-shaped base 26. The lower chuck 6 and the arc-shaped base 26 are respectively slidably sleeved on the corresponding slide rods. The vibration springs 28 are sleeved on the corresponding slide rods. Installation grooves 27 corresponding to each other in position are formed at the bottom of the upper chuck 5 and the top of the lower chuck 6. Two ends of the vibration springs 28 are respectively connected in the corresponding installation grooves 27. After the heat exchange tubes 4 are used for a period of time, due to the precipitation of high-salt iron phosphate wastewater, scaling will occur on the surfaces of the heat exchange tubes 4. At this time, by manually pulling the pull ring 20 intermittently, the adjusting ropes 19 at different positions contract towards the middle, thereby compressing the vertical springs 22 at different positions until the water inlet pipes 7 at the corresponding positions are driven to rise through the fixed plate. At the same time, with the elastic force of the vibration springs 28 and the guiding action of the slide rods, the heat exchange tubes 4 at different positions can undergo synchronous jolts, and the crystal attachments on the surfaces are shaken off into the evaporation tank 1, so as to achieve the purpose of regularly cleaning the evaporation tank 1 and the heat exchange tubes 4, which can not only ensure the heat exchange efficiency, optimize the evaporation crystallization effect, but also improve the crystallization purity.

[0038] Working principle of the present invention: When high-salt wastewater containing iron phosphate needs to be crystallized, the high-salt wastewater containing iron phosphate is injected into the evaporation tank 1, and then a heat source is input into the inlet pipe 7 through the water inlet end 10 and the corresponding water injection pipe 25. Then, the heat source is conveyed to the heat exchange pipe 4 through the connecting pipe 12. Subsequently, the heat exchange pipe 4 is used to heat and evaporate the high-salt wastewater containing iron phosphate to make it crystallize. During the continuous evaporation process, as the liquid level of the high-salt wastewater containing iron phosphate in the evaporation tank 1 gradually decreases, the balloon 17 and the floating plate 16 descend under the action of gravity, and the columnar valve 21 at the corresponding height is synchronously pulled up through the traction rope 18 and the adjustment rope 19. Thus, when the liquid level is lower than the height of the corresponding heat exchange pipe 4, the corresponding columnar valve 21 just rises to the height of the corresponding water injection pipe 25 to close the input end of the heat exchange pipe 4, so as to control the circulation heat exchange of the heat exchange pipes 4 at different heights. In this way, the operation of the heat exchange pipes 4 at the corresponding heights can be correspondingly controlled according to the height of the high-salt wastewater containing iron phosphate in the evaporation tank 1, thereby avoiding energy consumption waste caused by continuous operation of the heat exchange pipes 4 above the liquid level, achieving energy conservation and emission reduction, and improving the economic benefits when treating high-salt wastewater containing iron phosphate.

[0039] After the heat exchange pipe 4 is used for a period of time, due to the precipitation of high-salt wastewater containing iron phosphate, a scaling phenomenon will occur on the surface of the heat exchange pipe 4. At this time, by manually intermittently pulling up the pull ring 20, the adjustment ropes 19 at different positions contract towards the middle, thereby compressing the vertical springs 22 at different positions until the inlet pipe 7 at the corresponding position is driven to rise through the fixed disk. At the same time, with the elastic force of the vibration spring 28 and the guiding action of the sliding rod, the heat exchange pipes 4 at different positions can undergo synchronous jolts to shake off the crystalline attachments on the surface into the evaporation tank 1, so as to achieve the purpose of regularly cleaning the evaporation tank 1 and the heat exchange pipe 4, which can not only ensure the heat exchange efficiency, optimize the evaporation crystallization effect, but also improve the crystallization purity.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for evaporative crystallization of high-salt wastewater containing iron phosphate, characterized in that, The steps include the following: S1. The raw materials are pumped from the raw material tank through a raw material pump to recover the sensible heat of the condensate in the preheater. First, the raw material pump pumps a part of the raw materials into the circulation pipe of the separation chamber, and a part enters the evaporation chamber for evaporation, while the other part enters the crystallizer. S2. The solution in the evaporation chamber descends to the bottom of the evaporator and then is pumped into the tank heat exchanger by a steam compressor for heating and crystallization. During the process of evaporating the high-salt iron phosphate wastewater by the above steps, a tank heat exchanger is specifically involved. The tank heat exchanger includes an evaporation tank (1) provided with a charging end and a discharging end. One end of the evaporation tank (1) is connected by a flange to a heat exchange tank (2) arranged coaxially therewith. A water inlet pipe (7) and a water outlet pipe (8) corresponding in position are further provided in the heat exchange tank (2). A plurality of communicating pipes (12) are connected to both the water inlet pipe (7) and the water outlet pipe (8). The other end of each communicating pipe (12) is sleeved inside one end of a corresponding heat exchange pipe (4). The plurality of water inlet pipes (7) are located in different vertical planes and are all provided with communicating water injection pipes (25). The tank heat exchanger further includes a plurality of heat exchange pipes (4) for heating the high-salt iron phosphate wastewater. The heights of the plurality of heat exchange pipes (4) in the evaporation tank (1) are inconsistent, and one end of the evaporation tank (1) is further provided with a control component for independently controlling the participation of the plurality of heat exchange pipes (4) in heat exchange. The control component includes a cylindrical valve (21) lifted on the corresponding water inlet pipe (7) through an adjusting rope (19), and a balloon (17) located on the liquid surface in the evaporation tank (1). The balloon (17) can drive the corresponding adjusting rope (19) to lift and lower synchronously, and the adjusting rope (19) is located on one side of the corresponding water injection pipe (25) and is adapted to the inner diameter size of the corresponding water injection pipe (25). One end of the heat exchange pipe (4) is installed on a vibration component capable of driving the heat exchange pipe (4) to jolt. The vibration component includes an upper chuck (5) and a lower chuck (6) connected to each other through a vibration spring (28). During the continuous evaporation process, as the liquid level of the high-salt iron phosphate wastewater in the evaporation tank 1 gradually decreases, the balloon 17 can synchronously pull the cylindrical valve 21 at the corresponding height to rise through the adjusting rope 19, so that when the liquid level is lower than the height of the corresponding heat exchange pipe 4, the corresponding cylindrical valve 21 is exactly at the height of the corresponding water injection pipe 25, closing the input end of the heat exchange pipe 4.

2. The evaporation and crystallization process of high-salt wastewater of iron phosphate according to claim 1, wherein: The heat exchange pipes (4) are placed on the bottom end in the evaporation tank (1) through a plurality of mounting plates (3).

3. A process for evaporative crystallization of high-salt wastewater containing iron phosphate according to claim 2, characterized in that: Both the upper chuck (5) and the lower chuck (6) are sleeved inside one end of the evaporation tank (1), and both ends of the heat exchange pipe (4) penetrate through the corresponding upper chuck (5) or lower chuck (6).

4. A process for evaporative crystallization of high-salt wastewater of iron phosphate according to claim 3, characterized in that: A partition plate (9) for isolating the water inlet pipe (7) and the water outlet pipe (8) is further installed in the heat exchange tank (2), and a water inlet end (10) and a water discharge end (11) are further installed on the heat exchange tank (2). The plurality of water inlet pipes (7) are all located above the partition plate (9), and a drain pipe (14) is further connected to the water outlet pipe (8).

5. A process for evaporative crystallization of high-salt wastewater of iron phosphate, according to claim 4, characterized in that: A vertical pipe (13) is also connected to the water inlet pipe (7). The cylindrical valve (21) is slidably sleeved in the corresponding vertical pipe (13), and a fixed disk is sleeved at the top end of the vertical pipe (13). A common vertical spring (22) is connected between the fixed disk and the top end of the cylindrical valve (21).

6. A process for evaporative crystallization of high-salt wastewater of iron phosphate, according to claim 5, characterized in that: The cylindrical valve (21) at the lowest position preferentially rises to the height corresponding to the water injection pipe (25). When the subsequent cylindrical valve (21) reaches the adapted height of the established water injection pipe (25), the preferentially rising cylindrical valve (21) can still block the corresponding water injection pipe (25).

7. A process for evaporative crystallization of high-salt wastewater of iron phosphate according to claim 2, characterized in that: A vertical guide rod (15) is also installed on the inner wall of the evaporation tank (1). A floating plate (16) is slidably sleeved on the vertical guide rod (15). The balloon (17) is installed at the bottom of the floating plate (16), and a traction rope (18) is connected to the top of the floating plate (16). The other end of the traction rope (18) passes through the evaporation tank (1) after bypassing the reversing roller and is connected with a hanging ring. One end of the adjusting rope (19) passes through the heat exchange tank (2) and is connected with the hanging ring through a pull ring (20).

8. A process for evaporation crystallization of high-salt wastewater of iron phosphate, according to claim 7, characterized in that: An arc-shaped seat (23) is also installed on the outer wall of the heat exchange tank (2). A plurality of guide rods (24) with different heights are installed on the arc-shaped seat (23). One ends of the plurality of adjusting ropes (19) bypass the corresponding guide rods (24) and are connected to the same pull ring (20).

9. A process for evaporative crystallization of high-salt wastewater of iron phosphate according to claim 3, characterized in that: Both the upper chuck (5) and the lower chuck (6) are in the shape of incomplete disks. An arc-shaped base (26) located below the lower chuck (6) is sleeved at one end of the evaporation tank (1). The outer wall of the arc-shaped base (26) is attached to the inner wall of one end of the evaporation tank (1). Slide rods are provided between the upper chuck (5) and the lower chuck (6) and between the lower chuck (6) and the arc-shaped base (26). The lower chuck (6) and the arc-shaped base (26) are respectively slidably sleeved on the corresponding slide rods.

10. A process for evaporative crystallization of high-salt wastewater of iron phosphate according to claim 9, characterized in that: The vibration spring (28) is sleeved on the corresponding slide rod. Installation grooves (27) corresponding in position are provided at the bottom of the upper chuck (5) and the top end of the lower chuck (6). Both ends of the vibration spring (28) are respectively connected in the corresponding installation grooves (27).

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