Multi-mode intelligent regulation and control fluorine-containing wastewater resourceful treatment system

Abstract

The invention discloses a multi-mode intelligent regulation fluorine-containing wastewater resourceful treatment system, and relates to the technical field of fluorine-containing wastewater treatment.The system comprises an evaporation chamber used for generating hot steam, the upper side of the evaporation chamber is fixedly connected with a first water pump, and one side of the evaporation chamber is provided with a control box; steam generated by fluorine-containing wastewater in a first evaporation cavity or a second evaporation cavity enters an outer steam ring through a fourth steam outlet valve and a third steam outlet valve, so that the outer side of the passing fluorine-containing wastewater is preheated, the steam which is not completely utilized flows back through the first steam outlet valve during preheating, and the steam which is not completely utilized flows back through the second steam outlet valve during preheating. And the fluorine-containing wastewater flows into the inner steam ring through the second steam inlet valve, so that the inner side of the passing fluorine-containing wastewater is preheated, the interior and the exterior of the fluorine-containing wastewater are preheated at the same time, the preheating efficiency is higher, the internal and external preheated steam comes from steam generated during production, and the energy-saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluorine-containing wastewater treatment, in particular to a multi-mode intelligent control fluorine-containing wastewater resource treatment system. BACKGROUND

[0002] Fluorine-containing wastewater is a common and significant special wastewater in modern industry. The production, washing process of factories producing fluorine-containing refrigerants, fluorine-containing polymers (such as PTFE, commonly known as Teflon), fluorine-containing medicines and pesticides will all discharge fluorine-containing wastewater.

[0003] If not effectively treated, fluorine-containing wastewater will be discharged into water bodies, which will directly poison aquatic organisms and be enriched and amplified through the food chain (such as fish and shrimp), ultimately affecting the entire aquatic ecosystem, and irrigation with fluorine-containing wastewater will cause fluorine to accumulate in the soil, inhibit soil microbial activity, and cause plant poisoning, manifested as leaf tip necrosis and growth inhibition.

[0004] Traditional fluorine-containing wastewater treatment methods are mainly based on separation and fixation ideas, and the goal is to remove dissolved fluorine ions from water to meet discharge standards. These methods are mature and widely used, but they have limitations. Fluorine is often transferred from water to solid sludge or high-concentration waste liquid, producing new secondary pollutants (hazardous waste) that still need to be safely disposed of. The environmental risk has not been completely eliminated. The fixation and landfill of fluorine, which has important industrial value, as waste is a great waste of resources, and the disposal cost of reagents and sludge constitutes a long-term cost burden.

[0005] Therefore, it is necessary to design a fluorine-containing wastewater resource treatment system that can utilize fluorine production and energy saving. SUMMARY

[0006] The purpose of the present application is to provide a multi-mode intelligent control fluorine-containing wastewater resource treatment system to solve the problems raised in the background art.

[0007] In order to solve the above technical problems, the present application provides the following technical scheme: a multi-mode intelligent control fluorine-containing wastewater resource treatment system, comprising an evaporation chamber for generating hot steam, a first water pump fixedly connected to the upper side of the evaporation chamber, a control box provided on one side of the evaporation chamber, a preheating tank provided on one side of the control box for preliminarily preheating fluorine-containing wastewater, a heat exchanger provided on one side of the preheating tank for heating fluorine-containing wastewater after preheating, an evaporation tank provided on one side of the heat exchanger for adjusting the internal pressure value to produce fluorine-containing wastewater into ammonium bifluoride and ammonium fluoride, a wastewater tank provided on one side of the evaporation tank for storing fluorine-containing wastewater, and a second water pump fixedly connected to the output end of the wastewater tank.

[0008] According to the above technical solution, the preheating tank includes a first tank body. A first inlet valve is fixedly connected to one end of the first tank body and a first outlet valve is fixedly connected to the other end. A first liquid inlet valve is fixedly connected to one side of the first inlet valve and a first liquid outlet valve is fixedly connected to the other side of the first outlet valve. A first steam inlet valve, a second steam inlet valve, and a first steam outlet valve are fixedly connected to the upper side of the first tank body, and a first water outlet valve is fixedly connected to the lower side of the first tank body. A plurality of water suction holes are provided on the outer side of the first water outlet valve.

[0009] According to the above technical solution, an outer steam ring and an inner steam ring are fixedly connected between the first inlet valve and the first outlet valve. The outer steam ring has a first steam chamber inside and a second steam chamber inside. The water suction hole is located inside the second steam chamber. A wastewater chamber is provided between the outer steam ring and the inner steam ring. The output end of the first inlet valve is connected to the outer steam ring, the output end of the second inlet valve is connected to the inner steam ring, and the input end of the first outlet valve is connected to the outer steam ring. A first filter plate is fixedly connected inside both the first inlet valve and the first outlet valve.

[0010] According to the above technical solution, a second liquid outlet valve and a second liquid inlet valve are fixedly connected to both ends of the heat exchanger, a third steam inlet valve and a second steam outlet valve are fixedly connected to the upper side of the heat exchanger, and a second water outlet valve is fixedly connected to the lower side of the heat exchanger.

[0011] According to the above technical solution, the evaporator includes a second tank body. A second inlet valve is fixedly connected to one end of the second tank body and a double-ring outlet valve is provided at the other end. The double-ring outlet valve includes an outer ring valve and an inner ring valve. A third liquid inlet valve is fixedly connected to one side of the second inlet valve. A third steam outlet valve, a first pressure transmitter, a second pressure transmitter, and a fourth steam outlet valve are fixedly connected sequentially to the upper side of the second tank body.

[0012] According to the above technical solution, a second filter plate is fixedly connected inside the second inlet valve. The second filter plate is divided into an inner ring and an outer ring. The outer ring is provided with a plurality of second filter holes, and the inner ring is provided with a plurality of first filter holes. An inner tank is fixedly connected to one side of the second filter plate. The outer ring valve is hinged to one end of the second tank body, and the inner ring valve is hinged to one end of the inner tank. A first evaporation chamber is provided inside the inner tank. A second evaporation chamber is provided between the inner tank and the second tank body. The output end of the third steam outlet valve is connected to the second evaporation chamber. The output end of the fourth steam outlet valve is connected to the first evaporation chamber. The detection end of the first pressure transmitter is connected to the second evaporation chamber, and the detection end of the second pressure transmitter is connected to the first evaporation chamber.

[0013] According to the above technical solution, a sealing box is fixedly connected to the upper side of the built-in tank, and a vacuum pump is fixedly connected inside the sealing box. The output end of the vacuum pump is connected to the first evaporation chamber, and the input end of the vacuum pump is connected to the second evaporation chamber. The inner ring valve and the outer ring valve are respectively provided with a first vent valve and a second vent valve. The first vent valve is connected to the first evaporation chamber, and the second vent valve is connected to the second evaporation chamber.

[0014] According to the above technical solution, the output end of the second water pump is connected to the input end of the first inlet valve via a pipeline; the output end of the first outlet valve is connected to the input end of the second inlet valve via a pipeline; the output end of the second outlet valve is connected to the input end of the third inlet valve via a pipeline; the first outlet valve and the second outlet valve are connected via a pipeline, and the other end of the pipeline is connected to the input end of the first water pump; a three-way valve is fixedly connected to the input end of the first steam inlet valve; the third outlet valve and the fourth outlet valve are respectively connected to the first input end and the second input end via pipeline; the input end of the second steam inlet valve is connected to the output end of the first outlet valve via a pipeline; the input end of the third steam inlet valve is connected to the output end of the evaporation chamber via a pipeline; and the output end of the second outlet valve is connected to the input end of the evaporation chamber via a pipeline.

[0015] According to the above technical solution, a switching mechanism is provided on one side of the second filter plate. The switching mechanism includes two U-shaped rods fixedly connected inside the second inlet valve. A fixing plate is fixedly connected to one side of each of the two U-shaped rods. A sealing cylinder is connected to one end of the fixing plate. An electric push rod is fixedly connected inside the sealing cylinder. A lead wire tube is connected through one side of the sealing cylinder and the other end of the lead wire tube passes through the second inlet valve. The output end of the electric push rod passes through the sealing cylinder and an inner retaining ring is fixedly connected to the output end of the electric push rod.

[0016] According to the above technical solution, one end of the U-shaped rod is hinged to a second connecting rod, and the two ends of the second connecting rod are respectively hinged to a third connecting rod and a first connecting rod. The third connecting rod is hinged to an outer retaining ring, the first connecting rod is hinged to an inner retaining ring, and the outer retaining ring is slidably connected to the second inlet valve.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. By sending the steam generated inside the first or second evaporation chamber of the fluoride-containing wastewater through the fourth and third steam outlet valves to the outer steam ring, the outer side of the fluoride-containing wastewater is preheated. During preheating, any unused steam is returned through the first steam outlet valve and flows into the inner steam ring through the second steam inlet valve, thus preheating the inner side of the fluoride-containing wastewater. The fluoride-containing wastewater is preheated both inside and out simultaneously, resulting in higher preheating efficiency. Furthermore, since the steam used for both internal and external preheating comes from the steam generated during production, energy-saving effects are achieved.

[0018] 2. By setting up a first evaporation chamber and a second evaporation chamber, and pressurizing and negatively pressurizing them respectively, two different products, ammonium fluoride and ammonium bifluoride, can be produced from fluoride-containing wastewater in the same evaporator, achieving a high wastewater utilization rate.

[0019] 3. By extending and retracting the output end of the electric push rod, the outer and inner baffles are moved, thereby blocking the second and first filter holes respectively. This allows for free adjustment of the production mode corresponding to different materials. Furthermore, the products from the previous process can be removed using tools during the next process, achieving high production efficiency. Since the first and second steam chambers are pressurized and negatively pressurized respectively, the extension and retraction of the electric push rod opens the second and first filter holes intermittently. Fluid spontaneously flows from the high-pressure area to the low-pressure area, indirectly blowing and sucking air into the second and first filter holes. This helps remove scale and prevents scale from clogging the second and first filter holes, thus affecting subsequent wastewater treatment. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a multi-mode intelligent control system for the resource utilization of fluoride-containing wastewater according to the present invention. Figure 2 This is a schematic diagram of the preheating tank in this invention; Figure 3 This is a partial cross-sectional view of the preheating tank in this invention; Figure 4 This is a schematic diagram of the heat exchanger in this invention; Figure 5 This is a schematic diagram of the evaporator in this invention; Figure 6 This is a partial cross-sectional view of the evaporator in this invention; Figure 7 This is a schematic diagram of the pipeline connection in this invention; Figure 8 This is a schematic diagram showing the position of the switching mechanism in this invention; Figure 9 This is a schematic diagram of the switching mechanism in this invention; Figure 10 In this invention Figure 9 An enlarged schematic diagram of area A; In the diagram: 1. First water pump; 2. Evaporation chamber; 3. Evaporator; 31. Double-ring discharge valve; 32. Second inlet valve; 321. Second filter plate; 3211. First filter hole; 3212. Second filter hole; 33. Third liquid inlet valve; 34. Third steam outlet valve; 35. First pressure transmitter; 36. Second pressure transmitter; 37. Second tank body; 371. Vacuum pump; 372. Sealing box; 373. Internal tank; 38. Fourth steam outlet valve; 39. Switching mechanism; 391. Outer retaining ring; 392. Electric push rod; 393. Sealing cylinder; 394. Lead wire cylinder; 395. Fixing plate; 396. Inner retaining ring; 397. U-shaped rod; 3971. First connecting rod; 3972. Second connecting rod; 3973. Third connecting rod; 4. Wastewater tank; 5. Control box; 6. Preheating tank; 61. First tank body; 611. First filter plate; 612. Outer steam ring; 613. Inner steam ring; 62. First steam inlet valve; 63. Second steam inlet valve; 64. First steam outlet valve; 65. First liquid inlet valve; 66. First inlet valve; 67. First water outlet valve; 68. First outlet valve; 69. First liquid outlet valve; 7. Heat exchanger; 71. Second liquid outlet valve; 72. Third steam inlet valve; 73. Second steam outlet valve; 74. Second water outlet valve; 75. Second liquid inlet valve; 8. Second water pump; 9. Three-way valve. Detailed Implementation

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

[0022] Please see Figures 1-10 The present invention provides a technical solution: a multi-mode intelligent control system for the resource utilization of fluoride-containing wastewater, including an evaporation chamber 2 for generating hot steam, a first water pump 1 fixedly connected to the upper side of the evaporation chamber 2, a control box 5 on one side of the evaporation chamber 2, a preheating tank 6 for preheating the fluoride-containing wastewater on one side of the control box 5, a heat exchanger 7 for heating the preheated fluoride-containing wastewater on one side of the preheating tank 6, an evaporation tank 3 for adjusting the internal pressure value to produce ammonium bifluoride and ammonium fluoride from the fluoride-containing wastewater on one side of the heat exchanger 7, a wastewater tank 4 for storing the fluoride-containing wastewater on one side of the evaporation tank 3, and a second water pump 8 fixedly connected to the output end of the wastewater tank 4.

[0023] The preheating tank 6 includes a first tank body 61. A first inlet valve 66 is fixedly connected to one end of the first tank body 61 and a first outlet valve 68 is fixedly connected to the other end. A first liquid inlet valve 65 is fixedly connected to one side of the first inlet valve 66 and a first liquid outlet valve 69 is fixedly connected to the other side of the first outlet valve 68. A first steam inlet valve 62, a second steam inlet valve 63, and a first steam outlet valve 64 are fixedly connected to the upper side of the first tank body 61, and a first water outlet valve 67 is fixedly connected to the lower side of the first tank body 61. Several water suction holes are provided on the outer side of the first water outlet valve 67.

[0024] An outer steam ring 612 and an inner steam ring 613 are fixedly connected between the first inlet valve 66 and the first outlet valve 68. The outer steam ring 612 has a first steam chamber and a second steam chamber. The water suction hole is located inside the second steam chamber. A wastewater chamber is provided between the outer steam ring 612 and the inner steam ring 613. The output end of the first inlet valve 62 is connected to the outer steam ring 612. The output end of the second inlet valve 63 is connected to the inner steam ring 613. The input end of the first outlet valve 64 is connected to the outer steam ring 612. A first filter plate 611 is fixedly connected inside both the first inlet valve 66 and the first outlet valve 68.

[0025] The heat exchanger 7 has a second liquid outlet valve 71 and a second liquid inlet valve 75 fixedly connected to its two ends, a third steam inlet valve 72 and a second steam outlet valve 73 fixedly connected to its upper side, and a second water outlet valve 74 fixedly connected to its lower side.

[0026] The specific explanation based on the above structure is as follows: Wastewater tank 4 contains fluoride-containing wastewater (ammonium fluoride solution). When it is necessary to produce ammonium bifluoride, acid solution is added to the tank beforehand for mixing to adjust the fluoride-containing wastewater to acidic. When it is necessary to produce ammonium fluoride, ammonia solution is added to the tank beforehand for mixing to adjust the fluoride-containing wastewater to alkaline. After the fluoride-containing wastewater is adjusted, the fluoride-containing wastewater is extracted by the second water pump 8, and then drawn into the wastewater chamber through the first inlet valve 65 via a pipeline. It then flows out from the first outlet valve 69, through the pipeline and through the second inlet valve 75 into the water passage area of ​​the heat exchanger 7, and finally flows out from the second outlet valve 71 into the interior of the evaporator 3.

[0027] Evaporation chamber 2 starts up synchronously, generating a large amount of steam. The steam enters the heat exchange zone of heat exchanger 7 through pipes and the third steam inlet valve 72, heating the fluorine-containing wastewater to the temperature required for the production of ammonium bifluoride or ammonium fluoride. The steam after heating flows out from the second steam outlet valve 73 back into the evaporation chamber 2, thus circulating and heating the fluorine-containing wastewater. The condensate produced passes through the second water outlet valve 74 and is then drawn into the evaporation chamber 2 by the first water pump 1 for water circulation.

[0028] The evaporator 3 includes a second tank body 37. One end of the second tank body 37 is fixedly connected to a second inlet valve 32 and the other end is provided with a double-ring discharge valve 31. The double-ring discharge valve 31 includes an outer ring valve and an inner ring valve. A third liquid inlet valve 33 is fixedly connected to one side of the second inlet valve 32. A third steam outlet valve 34, a first pressure transmitter 35, a second pressure transmitter 36, and a fourth steam outlet valve 38 are fixedly connected in sequence on the upper side of the second tank body 37.

[0029] A second filter plate 321 is fixedly connected inside the second inlet valve 32. The second filter plate 321 is divided into an inner ring and an outer ring. The outer ring is provided with a number of second filter holes 3212, and the inner ring is provided with a number of first filter holes 3211. An inner tank 373 is fixedly connected to one side of the second filter plate 321. An outer ring valve is hinged to one end of the second tank 37, and an inner ring valve is hinged to one end of the inner tank 373. A first evaporation chamber is provided inside the inner tank 373. A second evaporation chamber is provided between the inner tank 373 and the second tank 37. The output end of the third steam outlet valve 34 is connected to the second evaporation chamber. The output end of the fourth steam outlet valve 38 is connected to the first evaporation chamber. The detection end of the first pressure transmitter 35 is connected to the second evaporation chamber. The detection end of the second pressure transmitter 36 is connected to the first evaporation chamber.

[0030] A sealed box 372 is fixedly connected to the upper side of the built-in tank 373. A vacuum pump 371 is fixedly connected inside the sealed box 372. The output end of the vacuum pump 371 is connected to the first evaporation chamber, and the input end of the vacuum pump 371 is connected to the second evaporation chamber. The inner ring valve and the outer ring valve are respectively provided with a first vent valve and a second vent valve. The first vent valve is connected to the first evaporation chamber, and the second vent valve is connected to the second evaporation chamber.

[0031] The output end of the second water pump 8 is connected to the input end of the first liquid inlet valve 65 via a pipeline. The output end of the first liquid outlet valve 69 is connected to the input end of the second liquid inlet valve 75 via a pipeline. The output end of the second liquid outlet valve 71 is connected to the input end of the third liquid inlet valve 33 via a pipeline. The first water outlet valve 67 and the second water outlet valve 74 are connected via a pipeline, and the other end of the pipeline is connected to the input end of the first water pump 1. A three-way valve 9 is fixedly connected to the input end of the first steam inlet valve 62. The third steam outlet valve 34 and the fourth steam outlet valve 38 are respectively connected to the first input end and the second input end via a pipeline. The input end of the second steam inlet valve 63 is connected to the output end of the first steam outlet valve 64 via a pipeline. The input end of the third steam inlet valve 72 is connected to the output end of the evaporation chamber 2 via a pipeline. The output end of the second steam outlet valve 73 is connected to the input end of the evaporation chamber 2 via a pipeline.

[0032] The specific explanation based on the above structure is as follows: Vacuum pump 371 is used to extract the gas inside the second evaporation chamber into the first evaporation chamber. When extracting the gas, both the first and second evaporation chambers are in a closed state. Before producing ammonium fluoride, in order to prevent boiling (sudden pressure drop causing liquid flashing and splashing), the second evaporation chamber is first evacuated to a negative pressure state, and then fluoride-containing wastewater is introduced into the second evaporation chamber. Before producing ammonium bifluoride, in order to prevent thermal shock, fluoride-containing wastewater is first introduced into the first evaporation chamber, and then the first evaporation chamber is pressurized to a pressurized state. When the second evaporation chamber is evacuated, the first evaporation chamber is also pressurized simultaneously.

[0033] The second filter plate 321 is used to filter impurities inside the fluoride-containing wastewater.

[0034] The first pressure transmitter 35 and the second pressure transmitter 36 are used to detect the air pressure values ​​inside the second evaporation chamber and the first evaporation chamber in real time, respectively. The first pressure transmitter 35 and the second pressure transmitter 36 operate on the same principle. They both sense the pressure through a corrosion-resistant sensing diaphragm that is in direct contact with the measured medium. The pressure causes a slight deformation of the diaphragm. This deformation changes the electrical characteristics of the internal components of the sensor (such as the resistance value of the strain gauge or the plate spacing of the capacitor). After the electronic circuit inside the sensor detects this slight change in electrical signal, it amplifies, linearizes, and performs temperature compensation processing on it. Finally, it outputs a standard electrical signal that is precisely linearly proportional to the applied pressure. This signal is transmitted to the control box 5, thereby realizing continuous and accurate measurement and automatic control of the positive or negative pressure state of the second evaporation chamber and the first evaporation chamber.

[0035] The heated fluoride-containing wastewater enters the interior of the second inlet valve 32 through the third inlet valve 33. The switching mechanism 39 guides the fluoride-containing wastewater to the first evaporation chamber or the second evaporation chamber. The fluoride-containing wastewater reaches its boiling point and evaporates inside the first or second evaporation chamber. The generated steam passes through the fourth steam outlet valve 38 and the third steam outlet valve 34, and then through the second steam inlet valve 63 into the interior of the outer steam ring 612, thereby preheating the outside of the fluoride-containing wastewater. During preheating, due to the excessive amount of steam generated, too much steam may not be fully utilized. Therefore, the generated condensate flows out through the first water outlet valve 67 and is drawn into the interior of the evaporation chamber 2 for water circulation. The unused steam flows back through the first steam outlet valve 64 and then flows into the interior of the inner steam ring 613 through the second steam inlet valve 63, thereby preheating the inside of the fluoride-containing wastewater. Finally, the generated condensate flows out through the first water outlet valve 67 and is drawn into the interior of the evaporation chamber 2 for water circulation.

[0036] Under negative pressure (vacuum) conditions, the boiling point of ammonium fluoride solution decreases, for example, to 78°C. As it heats and evaporates, water is removed, and the ammonium fluoride solution begins to concentrate. Crucially, the negative pressure environment and the artificial adjustment of the pH to a slightly alkaline state (e.g., pH 8) create conditions highly conducive to the escape of ammonia molecules. Ammonia in the ammonium fluoride solution is continuously removed in gaseous form by the vacuum system. This is equivalent to continuously removing the product NH3 from the right side of the equilibrium equation. According to Le Chatelier's principle, to compensate for this loss, the equilibrium will continue to shift to the right, thereby continuously consuming ammonium bifluoride, an intermediate product in the solution, causing it to decompose back into ammonium fluoride and ammonia. Ultimately, with the evaporation of water and the continuous decomposition of NH4HF2, the concentration of pure ammonium fluoride in the ammonium fluoride solution increases, reaching supersaturation and crystallizing out. In short, negative pressure and an alkaline environment are means of removing ammonia, with the aim of eliminating ammonium bifluoride in the ammonium fluoride solution, thereby purifying and producing ammonium fluoride crystals.

[0037] Under pressurized conditions, the system pressure is higher than atmospheric pressure, and the boiling point of the ammonium fluoride solution increases (e.g., above 110°C). At this time, the high-pressure environment strongly inhibits the escape of ammonia gas, which is equivalent to locking the product NH3 on the right side of the equilibrium equation. At the same time, the system controls the ammonium fluoride solution in an acidic environment, which provides conditions for the stable existence of ammonium bifluoride. During the heating, evaporation, and concentration process, the water content decreases continuously, and the concentration of ammonium fluoride in the solution increases sharply. Since ammonia cannot escape effectively, the entire chemical equilibrium is frozen and shifts to the right, causing two molecules of ammonium fluoride to combine to form one molecule of ammonia and one molecule of ammonium bifluoride. The locked ammonia exists in ionic form, while ammonium bifluoride accumulates continuously in the ammonium fluoride solution as the target product. As the concentration reaches supersaturation, it preferentially crystallizes out. In short, pressurization and an acidic environment are means of locking ammonia, and their purpose is to retain and concentrate ammonium bifluoride in the ammonium fluoride solution, thereby directly producing ammonium bifluoride crystals.

[0038] Once all ammonium fluoride or ammonium bifluoride has been produced, the first and second vent valves allow air to circulate through them, restoring the pressure inside the first and second evaporation chambers to normal. The corresponding product can then be removed by opening the outer or inner ring valve.

[0039] This invention utilizes resource-based treatment to recover and reuse fluoride, ammonia, and other substances in wastewater, producing by-products without generating new pollutants. The by-products, apart from ammonium bifluoride and ammonium fluoride, do not produce other hazardous chemicals.

[0040] A switching mechanism 39 is provided on one side of the second filter plate 321. The switching mechanism 39 includes two U-shaped rods 397 fixedly connected to the inside of the second inlet valve 32. A fixing plate 395 is fixedly connected to one side of each of the two U-shaped rods 397. A sealing cylinder 393 is connected to one end of the fixing plate 395. An electric push rod 392 is fixedly connected inside the sealing cylinder 393. A lead wire cylinder 394 is connected through one side of the sealing cylinder 393 and the other end of the lead wire cylinder 394 passes through the second inlet valve 32. The output end of the electric push rod 392 passes through the sealing cylinder 393 and an inner retaining ring 396 is fixedly connected to the output end of the electric push rod 392.

[0041] One end of the U-shaped rod 397 is hinged to a second connecting rod 3972. The two ends of the second connecting rod 3972 are respectively hinged to a third connecting rod 3973 and a first connecting rod 3971. The third connecting rod 3973 is hinged to an outer retaining ring 391. The first connecting rod 3971 is hinged to an inner retaining ring 396. The outer retaining ring 391 is slidably connected to the second inlet valve 32.

[0042] The specific explanation based on the above structure is as follows: When ammonium fluoride needs to be produced, the output end of the electric push rod 392 retracts completely, driving the inner retaining ring 396 to move backward, indirectly driving the first connecting rod 3971 to pull the second connecting rod 3972 to rotate, thereby driving the third connecting rod 3973 to swing, pushing the outer retaining ring 391 forward, thus blocking the second filter hole 3212 of the outer ring of the second filter plate 321. At this time, the first evaporation chamber and the second evaporation chamber are not interconnected and are both in a closed state. The interior of the second evaporation chamber is drawn into a negative pressure. When the evaporation chamber is pressurized, and the fluoride-containing wastewater is about to enter the second evaporation chamber, the output end of the electric push rod 392 extends fully, driving the inner retaining ring 396 to move forward, which indirectly drives the first connecting rod 3971 to pull the second connecting rod 3972 to rotate, thereby driving the third connecting rod 3973 to swing and pull the outer retaining ring 391 backward, thus blocking the first filter hole 3211 of the inner ring of the second filter plate 321. At this time, the first evaporation chamber and the second evaporation chamber are not interconnected, and the fluoride-containing wastewater flows into the negative pressure second evaporation chamber for evaporation.

[0043] When ammonium bifluoride needs to be produced, the output end of the electric push rod 392 retracts completely, driving the inner retaining ring 396 to move backward, indirectly driving the first connecting rod 3971 to pull the second connecting rod 3972 to rotate, thereby driving the third connecting rod 3973 to swing, pushing the outer retaining ring 391 forward, thus blocking the second filter hole 3212 on the outer ring of the second filter plate 321. At this time, the fluoride-containing wastewater first flows into half of the first evaporation chamber, the output end of the electric push rod 392 extends completely, pulling the outer retaining ring 391 backward, thus blocking the first filter hole 3211 on the inner ring of the second filter plate 321. The first evaporation chamber and the second evaporation chamber are not interconnected and are both in a closed state. The inside of the second evaporation chamber is drawn into a negative pressure, and the first evaporation chamber becomes a pressurized state. At this time, the fluoride-containing wastewater inside the first evaporation chamber begins to boil. The output end of the electric push rod 392 retracts completely again, blocking the second filter hole 3212 on the outer ring of the second filter plate 321 again. At this time, the heated fluoride-containing wastewater continues to flow into the first evaporation chamber for evaporation.

[0044] Under stable evaporation conditions, as long as the volume of steam generated and discharged from the wastewater remains dynamically equal to the volume of wastewater entering, the volume and pressure of the gas phase space in the first or second evaporation chamber can be kept constant.

[0045] In pressurization mode, if the pressure is too high, the opening of the fourth steam outlet valve 38 at the top will be increased to release more steam. If the pressure is too low, the opening will be reduced to allow the steam to be trapped inside and pressurized.

[0046] In negative pressure mode: if the vacuum level is insufficient (pressure is too high), increase the pumping speed of vacuum pump 371; if the vacuum level is too high, introduce a small amount of inert gas or slow down the pumping speed.

[0047] Even after pretreatment, trace amounts of suspended solids, calcium, magnesium, silicon, iron, and other impurity ions in the wastewater are difficult to avoid. After heating and concentration, the solubility of these impurities decreases, forming hard scale such as calcium sulfate, silicate, calcium fluoride, and iron hydroxide, which firmly adhere to the heating wall and orifices, easily clogging the second filter hole 3212 and the first filter hole 3211. Since the first steam chamber and the second steam chamber are pressurized and negatively pressurized respectively, the second filter hole 3212 and the first filter hole 3211 are opened intermittently by extending and retracting the output end of the electric push rod 392 to blow and suck air into the filter holes, which helps the scale to fall off and prevents the scale from clogging the second filter hole 3212 and the first filter hole 3211, thus affecting the subsequent wastewater treatment.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 multi-mode intelligent regulation fluorine-containing wastewater resourceful treatment system, comprising an evaporation chamber (2) for generating hot steam, characterized in that, The upper side of the evaporation chamber (2) is fixedly connected with a first water pump (1), one side of the evaporation chamber (2) is provided with a control box (5), one side of the control box (5) is provided with a preheating tank (6), one side of the preheating tank (6) is provided with a heat exchanger (7), one side of the heat exchanger (7) is provided with an evaporation tank (3) for adjusting the internal pressure value, so as to produce fluorine-containing wastewater into ammonium bifluoride and ammonium fluoride, one side of the evaporation tank (3) is provided with a wastewater tank (4) for storing fluorine-containing wastewater, and the output end of the wastewater tank (4) is fixedly connected with a second water pump (8); The preheating tank (6) comprises a first tank body (61), one end of the first tank body (61) is fixedly connected with a first inlet valve (66) and the other end is fixedly connected with a first outlet valve (68), one side of the first inlet valve (66) is fixedly connected with a first liquid inlet valve (65), the other side of the first outlet valve (68) is fixedly connected with a first liquid outlet valve (69), the upper side of the first tank body (61) is fixedly connected with a first steam inlet valve (62), a second steam inlet valve (63) and a first steam outlet valve (64) respectively, and the lower side of the first tank body (61) is fixedly connected with a first water outlet valve (67), and a plurality of water suction holes are arranged on the outer side of the first water outlet valve (67); The first inlet valve (66) and the first outlet valve (68) are fixedly connected with an outer steam ring (612) and an inner steam ring (613), the first steam cavity is arranged in the inner steam ring (612), the second steam cavity is arranged in the inner steam ring (612), the water suction hole is arranged in the second steam cavity, and the wastewater cavity is arranged between the outer steam ring (612) and the inner steam ring (613).

2. The multi-mode intelligent regulation fluorine-containing wastewater resourceful treatment system according to claim 1, characterized in that, The output end of the first steam inlet valve (62) is communicated with the outer steam ring (612), the output end of the second steam inlet valve (63) is communicated with the inner steam ring (613), the input end of the first steam outlet valve (64) is communicated with the outer steam ring (612), and the first inlet valve (66) and the first outlet valve (68) are fixedly connected with a first filter plate (611).

3. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 1, characterized in that, The two ends of the heat exchanger (7) are respectively fixedly connected with a second liquid outlet valve (71) and a second liquid inlet valve (75), the upper side of the heat exchanger (7) is respectively fixedly connected with a third steam inlet valve (72) and a second steam outlet valve (73), and the lower side of the heat exchanger (7) is fixedly connected with a second water outlet valve (74).

4. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 1, characterized in that, The evaporation tank (3) comprises a second tank body (37), one end of the second tank body (37) is fixedly connected with a second inlet valve (32) and the other end is provided with a double-ring discharge valve (31), the double-ring discharge valve (31) comprises an outer ring valve and an inner ring valve, one side of the second inlet valve (32) is fixedly connected with a third liquid inlet valve (33), and the upper side of the second tank body (37) is sequentially fixedly connected with a third steam outlet valve (34), a first pressure transmitter (35), a second pressure transmitter (36) and a fourth steam outlet valve (38).

5. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 4, characterized in that, The second filter plate (321) is internally fixedly connected with the second inlet valve (32), the second filter plate (321) is divided into an inner ring and an outer ring, the outer ring is provided with a plurality of second filter holes (3212), the inner ring is provided with a plurality of first filter holes (3211), one side of the second filter plate (321) is fixedly connected with an internal tank (373), the outer ring valve is hinged to one end of the second tank body (37), the inner ring valve is hinged to one end of the internal tank (373), and the internal tank (373) is internally provided with a first evaporation cavity.

6. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 5, characterized in that, The second evaporation cavity is arranged between the internal tank (373) and the second tank body (37), the output end of the third steam outlet valve (34) is communicated with the second evaporation cavity, the output end of the fourth steam outlet valve (38) is communicated with the first evaporation cavity, the detection end of the first pressure transmitter (35) is communicated with the second evaporation cavity, and the detection end of the second pressure transmitter (36) is communicated with the first evaporation cavity.

7. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 6, characterized in that, The upper side of the internal tank (373) is fixedly connected with a sealing box (372), the sealing box (372) is internally fixedly connected with a vacuum pump (371), the output end of the vacuum pump (371) is communicated with the first evaporation cavity, the input end of the vacuum pump (371) is communicated with the second evaporation cavity, the inner parts of the inner ring valve and the outer ring valve are respectively provided with a first air release valve and a second air release valve, the first air release valve is communicated with the first evaporation cavity, and the second air release valve is communicated with the second evaporation cavity.

8. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 5, characterized in that, One side of the second filter plate (321) is provided with a switching mechanism (39), the switching mechanism (39) comprises two U-shaped rods (397) fixedly connected to the inside of the second inlet valve (32), one side of each of the two U-shaped rods (397) is fixedly connected with a fixed plate (395), one end of the fixed plate (395) is fixedly connected with a sealing cylinder (393), and the inside of the sealing cylinder (393) is fixedly connected with an electric push rod (392).

9. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 8, characterized in that, One side of the sealing cylinder (393) is connected with a lead cylinder (394) and the other end of the lead cylinder (394) penetrates the second inlet valve (32), the output end of the electric push rod (392) penetrates the sealing cylinder (393), and the output end of the electric push rod (392) is fixedly connected with an inner blocking ring (396).

10. The multi-mode intelligent regulated fluorine-containing wastewater resourceful treatment system according to claim 9, characterized in that, One end of the U-shaped rod (397) is hinged with a second connecting rod (3972), the two ends of the second connecting rod (3972) are respectively hinged with a third connecting rod (3973) and a first connecting rod (3971), the third connecting rod (3973) is hinged with an outer blocking ring (391), the first connecting rod (3971) is hinged with the inner blocking ring (396), and the outer blocking ring (391) is slidably connected with the second inlet valve (32).

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