A rotary gas membrane separation device and wastewater deammoniation system thereof

Abstract

The invention discloses a rotary gas membrane separation device and a wastewater deammonification system thereof, belonging to the technical field of wastewater treatment. The rotary gas membrane separation device comprises an inner sleeve and an outer sleeve which are rotatably connected, and the inner sleeve and the outer sleeve are divided into a first exhaust chamber, a heating chamber and a second exhaust chamber by a sealing bearing; a water inlet pipe and a water outlet pipe are arranged on the inner sleeve, and a first gas collecting chamber, a degassing chamber and a second gas collecting chamber are formed in the inner sleeve by a check valve, and a separation filter element is arranged in the degassing chamber. The wastewater deammonification system comprises a wastewater tank, a liquid supply bracket, a liquid discharge bracket, a mounting bracket, a rotary gas membrane separation device and a rotating mechanism, and the liquid supply pipe exchanges heat with the gas discharged from the outer sleeve through a heat exchanger. A low-boiling point physical evaporation treatment technology is formed, which can be widely used for the separation of elements below the boiling point of water (such as ammonia element), and the concentration of recovered ammonia is ensured. The rotation of wastewater can prolong the treatment time, prevent particulate matter from clogging the membrane pores, and ensure the element recovery efficiency and recovery rate.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a rotary gas membrane separation device and a wastewater deammoniation system thereof. Background Art

[0002] Ammonia in wastewater is a toxic and harmful gas that must be treated to meet standards before it can be discharged. Ammonia is the raw material for synthesizing nitrogen fertilizers, compound fertilizers, urea, melamine, etc. It is an important basic chemical raw material and an important solvent in organic and inorganic synthesis. It is also the raw material for synthesizing many very high value-added products, such as ammonium molybdate, ammonium tungstate, etc. Therefore, the recovery and utilization of ammonia in wastewater has economic value.

[0003] There are two main methods for removing ammonia from wastewater: chemical treatment and physical treatment. Among them, physical treatment of wastewater ammonia evaporation is widely used due to its low cost and simple process flow. In the process of wastewater ammonia evaporation, if you want to increase the deammoniation rate of wastewater, you need to increase the temperature of the wastewater to remove the ammonia in the wastewater by forming more ammonia vapor, but it also causes more water molecules to evaporate. The size of ammonia and water vapor is about 0.3nm. The deammonification filter membrane alone cannot effectively distinguish ammonia from water vapor, which results in the collected ammonia water having a lower concentration. Moreover, as the temperature continues to rise, some soluble organic matter in the wastewater will also co-boil with water. The membrane pores of the deammonification filter membrane are generally around 0.1um, which cannot effectively intercept the evaporated organic matter and cannot effectively separate ammonia and organic matter. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a rotating gas membrane separation device and a wastewater deammonification system thereof, which is a low-boiling point physical evaporation treatment technology and can be widely used for the separation of elements below the boiling point of water (such as ammonia). Under the action of negative pressure suction, the elements to be separated from the wastewater can quickly form element vapor at a suitable evaporation temperature of the element and be discharged through the hydrophobic membrane of the separation filter element. Since the wastewater temperature is not sufficient to evaporate the wastewater and other substances in the wastewater, water vapor and other substance vapors will not be generated, and the problem of mixing with ammonia vapor and being indistinguishable will not occur, thereby ensuring the concentration of recovered ammonia. At the same time, the wastewater rotation method can extend the wastewater treatment time, improve the water return rate, and at the same time flush the filter element to prevent particulate matter from precipitating and clogging the membrane pores, thereby ensuring the element recovery efficiency.

[0005] To achieve the above object, the present invention provides the following solution: The present invention discloses a rotating gas membrane separation device, comprising an inner sleeve and an outer sleeve coaxially sleeved from inside to outside;

[0006] The outer sleeve is arranged horizontally, and the outer sleeve and the inner sleeve are rotatably connected via a sealing bearing, and the sealing bearing divides the space between the outer sleeve and the inner sleeve into a first exhaust chamber, a heating chamber, and a second exhaust chamber, and the first exhaust chamber, the heating chamber, and the second exhaust chamber are arranged in sequence along the axial direction of the outer sleeve, a heating device is installed in the heating chamber, and the first exhaust chamber and the second exhaust chamber are both provided with exhaust ports, and the exhaust ports are connected to a vacuum pump;

[0007] A water inlet pipe is provided at one end of the inner sleeve, and a water outlet pipe is provided at the other end of the inner sleeve, a first check valve is provided on the water inlet pipe, and a second check valve is provided on the water outlet pipe, a first air collecting chamber is formed between the first check valve, the inner sleeve and the water inlet pipe, the first air collecting chamber and the first exhaust chamber are positioned corresponding to each other and are interconnected, a degassing chamber can be formed between the first check valve, the inner sleeve and the second check valve, the degassing chamber and the heating chamber are positioned corresponding to each other, a separation filter element with a hydrophobic membrane is provided in the degassing chamber, the water inlet end and the water outlet end of the separation filter element are respectively connected to the water inlet pipe and the water outlet pipe, a second air collecting chamber is formed between the second check valve, the inner sleeve and the water outlet pipe, the second air collecting chamber and the second exhaust chamber are positioned corresponding to each other and are interconnected.

[0008] Preferably, both ends of the inner sleeve are provided with end covers, and the end covers are provided with mounting holes for sealing connection of the water inlet pipe or the water outlet pipe, and the two ends of the outer sleeve are connected to the end covers at both ends of the inner sleeve through sealing bearings.

[0009] Preferably, the heating device is a microwave heater.

[0010] Preferably, the first gas collecting chamber and the second gas collecting chamber are respectively connected to the first exhaust chamber and the second exhaust chamber through air outlet holes.

[0011] Preferably, the inner wall of the hydrophobic membrane on the separation filter element is coated with polytetrafluoroethylene.

[0012] Preferably, the polytetrafluoroethylene is coated in a three-dimensional V-shape.

[0013] Preferably, both the water inlet pipe and the water outlet pipe are provided with a thermometer and a pressure gauge, and the water inlet pipe is provided with a flow meter.

[0014] Also disclosed is a wastewater deammonification system, comprising a wastewater tank, a liquid supply bracket, a liquid discharge bracket, a mounting bracket, the above-mentioned rotating gas membrane separation equipment and a rotating mechanism for driving the inner sleeve of the rotating gas membrane separation equipment to rotate, wherein a liquid supply pipe is mounted on the liquid supply bracket, the liquid supply pipe is rotationally connected to the water inlet pipe of the inner sleeve, a liquid discharge bracket is provided with a liquid discharge pipe, the liquid discharge pipe is rotationally connected to the water outlet pipe of the inner sleeve, the outer sleeve of the rotating gas membrane separation equipment is fixed on the mounting bracket, and the liquid in the liquid supply pipe is heat exchanged with the gas extracted by the vacuum pump through a heat exchanger.

[0015] Preferably, the rotating mechanism includes a driving motor, a driving pulley and a driven pulley, the driving motor is mounted on a liquid supply bracket or a liquid discharge bracket, the driving pulley is mounted on an output shaft of the driving motor, the driven pulley is coaxially fixed on the water inlet pipe, and the driving pulley and the driven pulley are connected by a driving belt.

[0016] Preferably, the exhaust port of the rotating gas membrane separation device is connected to an exhaust pipe, and the exhaust pipe is connected to the inlet end of the first heat exchange passage of the heat exchanger through the vacuum pump, the outlet end of the first heat exchange passage of the heat exchanger is connected to a collecting device, the liquid supply pipe is connected to the inlet end of the second heat exchange passage of the heat exchanger, and the water inlet pipe is connected to the outlet end of the second heat exchange passage of the heat exchanger.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] 1. In the rotary gas membrane separation device of the present invention, after the wastewater enters the inner casing from the water inlet pipe, under the negative pressure difference generated by the suction of the vacuum pump, the elements to be removed from the wastewater (which must be elements below the boiling point of water, such as ammonia) can form steam and separate from the wastewater at a suitable evaporation temperature of the element (lower than the boiling point of water), flow into the gas collecting chamber from the outside of the hydrophobic membrane, and be discharged from the exhaust port of the exhaust chamber. The evaporation temperature does not need to be very high, and in summer, there is no need to turn on the heating device, and it can be achieved only by relying on the temperature of the wastewater itself. The whole process is a low-boiling point physical evaporation treatment technology. Because the evaporation temperature does not reach the boiling point of water, the wastewater will not produce water vapor, and the substances in the wastewater that are not easy to evaporate (such as salts, organic matter, etc.) will flow from the inner side of the hydrophobic membrane to the outlet pipe together with the wastewater and be discharged to purify the wastewater and ensure the concentration of recovered ammonia. The wastewater flows in a spiral under the rotation of the inner sleeve, so it can retain the wastewater, extend the wastewater passage time, ensure that ammonia is separated from the wastewater as much as possible, and improve the recovery rate. At the same time, it can flush the hydrophobic membrane to prevent particulate matter from precipitating and adhering to the hydrophobic membrane to block the membrane pores, thereby ensuring efficient collection of elements (such as ammonia) and high recovery efficiency.

[0019] Other solutions of the present invention also achieve the following technical effects:

[0020] 1. In the rotary gas membrane separation device of the present invention, the polytetrafluoroethylene coated on the inner wall of the hydrophobic membrane increases the surface tension of the membrane, enhances the hydrophobicity and the stability of the structure.

[0021] 2. In the rotating gas membrane separation device of the present invention, polytetrafluoroethylene is coated in a three-dimensional V-shaped manner, which can effectively improve the hydrophobic permeability selectivity of the hydrophobic membrane, prolong the residence time of the gas in the membrane, and improve the ammonia evaporation efficiency.

[0022] 3. In the rotary gas membrane separation device of the present invention, the heating device adopts a microwave heating device, which can ensure the liquid temperature and achieve ammonia removal at a lower pH value.

[0023] 4. In the wastewater deammonification system of the present invention, a rotating gas membrane separation device is used. In addition to being efficient, low-cost, high in recovery efficiency and economically valuable, it can achieve the separation of low-boiling point wastewater and ammonia by physical methods. Because the ammonia passing through the hydrophobic membrane is in a steam state and has a high latent heat of vaporization, the wastewater can be heated through a heat exchanger to recover heat, thereby reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0025] Figure 1 Schematic diagram of the structure of the wastewater deammoniation system in the embodiment;

[0026] Figure 2 is a schematic diagram of the internal structure of the rotating gas membrane separation device in the embodiment;

[0027] Figure 3 is a schematic structural diagram of an inner sleeve in an embodiment;

[0028] Figure 4 is a schematic structural diagram of a cross section of a hydrophobic membrane in an embodiment;

[0029] Figure 5 Free NH in water 3 (g) Graph showing the relationship between the ionization equilibrium and pH and temperature.

[0030] Explanation of the accompanying drawings: 1. wastewater tank; 2. liquid supply bracket; 3. liquid discharge bracket; 4. mounting bracket; 5. rotating gas membrane separation equipment; 6. liquid supply pipe; 7. liquid discharge pipe; 8. exhaust pipe; 9. vacuum pump; 10. driving motor; 11. driving pulley; 12. driven pulley; 13. driving belt; 14. rotating bearing; 15. heat exchanger; 16. inner sleeve; 17. outer sleeve; 18. water inlet pipe; 19. water outlet pipe; 20. thermometer; 21. pressure gauge; 22. flow meter; 23. sealing bearing; 24. first check valve; 25. second check valve; 26. heating device; 27. end cover; 28. first exhaust chamber; 29. ​​heating chamber; 30. second exhaust chamber; 31. first gas collecting chamber; 32. degassing chamber; 33. second gas collecting chamber; 34. air outlet; 35. hydrophobic membrane; 36. polytetrafluoroethylene. DETAILED DESCRIPTION

[0031] 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.

[0032] Example 1

[0033] This embodiment provides a rotary gas membrane separation device, such as Figures 1 to 5 As shown, it includes an inner sleeve 16 and an outer sleeve 17. The outer sleeve 17 is arranged horizontally, and the inner sleeve 16 is coaxially sleeved in the outer sleeve 17.

[0034] The outer sleeve 17 and the inner sleeve 16 are connected by a plurality of sealed bearings 23 to achieve sealing and relative rotation between the two. The plurality of sealed bearings 23 divide the space between the outer sleeve 17 and the inner sleeve 16 into a first exhaust chamber 28, a heating chamber 29 and a second exhaust chamber 30, and the first exhaust chamber 28, the heating chamber 29 and the second exhaust chamber 30 are sequentially arranged along the axial direction of the outer sleeve 17. A heating device 26 is installed in the heating chamber 29, and both the first exhaust chamber 28 and the second exhaust chamber 30 are provided with exhaust ports, which are connected to the vacuum pump 9. Specifically, the inner wall of the sealed bearing 23 is sealed and fixedly connected to the inner wall of the inner sleeve 16, and the outer wall of the sealed bearing 23 is sealed and fixedly connected to the inner wall of the outer sleeve 17, and the sealed bearing 23 can adopt a conventional bearing with a sealing effect.

[0035] An inlet pipe 18 is provided at one end of the inner sleeve 16, and an outlet pipe 19 is provided at the other end of the inner sleeve 16. A first check valve 24 is provided on the inlet pipe 18, and a second check valve 25 is provided on the outlet pipe 19. A first air collecting chamber 31 is formed between the first check valve 24, the inner sleeve 16 and the inlet pipe 18. The first air collecting chamber 31 is communicated with the first exhaust chamber 28, and their positions in the axial direction of the inner sleeve 16 correspond to each other. A degassing chamber 32 is formed between the first check valve 24, the inner sleeve 16 and the second check valve 25. The degassing chamber 32 corresponds to the heating chamber 29 and their positions in the axial direction of the inner sleeve 16 correspond to each other. A separation filter element having a hydrophobic membrane 35 is provided in the degassing chamber 32, and the water inlet end and the water outlet end of the separation filter element are communicated with the inlet pipe 18 and the outlet pipe 19 respectively. A second air collecting chamber 33 is formed between the second check valve 25 , the inner sleeve 16 and the water outlet pipe 19 . The second air collecting chamber 33 and the second exhaust chamber 30 are communicated with each other and correspond to each other in the axial direction of the inner sleeve 16 .

[0036] Working principle, taking wastewater deammoniation treatment as an example:

[0037] The wastewater is passed into the water inlet pipe 18, the vacuum pump 9 is started, and the inner sleeve 16 is driven to rotate. The heating device 26 is turned on or off according to whether the water temperature of the wastewater reaches the deamination temperature (the deamination temperature generally requires the wastewater to be between 30°C and 45°C. If it cannot be reached, the heating device 26 needs to be turned on. Usually, the temperature of the wastewater itself can reach this range in summer). The wastewater will rotate through the separation filter element. When the wastewater enters the separation filter element, the ammonia in the wastewater will form ammonia vapor at the deamination temperature. After the ammonia vapor passes through the hydrophobic membrane 35, it will gather in the degassing chamber 32. After the gas reaches a certain pressure value, it will pass through the first check valve 24 and the second check valve 25 into the first gas collecting chamber 31 and the second gas collecting chamber 32. 33, then enter the first exhaust chamber 28, the second exhaust chamber 30, and be discharged through the exhaust port under the suction of the vacuum pump 9. Under the action of the first check valve 24 and the second check valve 25, ammonia vapor can be prevented from flowing back into the degassing chamber 32, while high-boiling-point substances such as wastewater and salts cannot pass through the hydrophobic membrane 35, so they will continue to be transported and then discharged from the outlet pipe 19, so that ammonia and other substances are separated and the deammonification treatment of wastewater is completed. The wastewater passes through the hydrophobic membrane 35 while rotating, which can retain the wastewater, prolong the passing time of the wastewater, and ensure that ammonia is separated from the wastewater as much as possible. On the other hand, it can flush the hydrophobic membrane 35 to prevent particulate matter from precipitating and adhering to the hydrophobic membrane 35 and blocking the membrane pores. The exhaust port can be connected to a collection device, so that ammonia can be continuously collected. The collected ammonia can be subsequently cooled and converted into liquid ammonia water, which can be sold as an ammonia water product, or further enter the distillation tower to obtain anhydrous ammonia, and finally compressed and cooled to obtain a liquid ammonia product. The exhaust port can be connected to a vacuum device to put the inner sleeve 16 in a negative pressure state, thereby improving the collection efficiency.

[0038] The above mainly takes wastewater deammoniation treatment as an example, and does not rule out application in other application scenarios that can be treated by the equipment.

[0039] In one embodiment, if Figures 1 to 5 As shown, both ends of the inner sleeve 16 are provided with end covers 27, and mounting holes are provided on the end covers 27. The water inlet pipe 18 is sealed and connected in the mounting hole of one of the end covers 27, and the water outlet pipe 19 is sealed and connected in the mounting hole of the other end cover 27. The two ends of the outer sleeve 17 are connected to the end covers 27 at both ends of the inner sleeve 16 through the sealing bearings 23. Specifically, the diameter of the end covers 27 is larger than that of the inner sleeve 16, wherein the inner rings of the two sealing bearings 23 are sealed and fixedly connected to the inner sleeve 16, the inner ring side walls of the two sealing bearings 23 are sealed and fixedly connected to the two end covers 27 respectively, and the outer rings of the two sealing bearings 23 are sealed and fixedly connected to the inner wall of the outer sleeve 17.

[0040] In one embodiment, if Figures 1 to 5 As shown, the heating device 26 is a microwave heater. Compared with other heating devices, the microwave heater has a faster heating efficiency. It should be noted that when using a microwave heater, the inner sleeve 16 needs to be made of a wave-transparent material tube to facilitate microwave penetration and heating of wastewater, and the outer sleeve 17 needs to be a metal tube to shield microwaves and prevent microwave leakage. Of course, the heating device 26 can also use other heating equipment, such as an electric heating device. Although the heating efficiency of the electric heating device is not as good as that of the microwave, it allows the inner sleeve 16 to be made of metal material, so that the inner sleeve 16 has sufficient strength to carry more wastewater, and the metal material can also effectively transfer heat. The heating device 26 can be installed on the inner sleeve 16 and rotate with the inner sleeve 16, or it can be installed on the outer sleeve 17 and not rotate with the inner sleeve 16.

[0041] In one embodiment, if Figures 1 to 5 As shown, the first gas collecting chamber 31 and the second gas collecting chamber 33 are both provided with an air outlet 34, and the first gas collecting chamber 31 is connected with the first exhaust chamber 28 through the air outlet 34, and the second gas collecting chamber 33 is connected with the second exhaust chamber 30 through the air outlet 34. Preferably, the air outlet 34 of the first gas collecting chamber 31 and the air outlet 34 of the second gas collecting chamber 33 are arranged along the circumference of the tube wall of the inner sleeve 16. The shape of the air outlet 34 is set as required, and a circular hole, a square hole or a hole of other shapes can be used.

[0042] In one embodiment, if Figures 1 to 5 As shown, the inner wall of the hydrophobic membrane 35 on the separation filter element is coated with polytetrafluoroethylene 36 to increase the surface tension and antioxidant capacity of the membrane, and enhance the hydrophobicity and structural stability.

[0043] In one embodiment, if Figures 1 to 5As shown, polytetrafluoroethylene 36 adopts a three-dimensional V-shaped coating method, which can effectively improve the hydrophobic permeability selectivity of the membrane, prolong the residence time of the gas in the membrane, improve the ammonia evaporation efficiency, and is beneficial to the deammoniation rate of wastewater.

[0044] In one embodiment, if Figures 1 to 5 As shown, the water inlet pipe 18 and the water outlet pipe 19 are both provided with a thermometer 20 and a pressure gauge 21, and the water inlet pipe 18 is also provided with a flow meter 22. The thermometer 20 on the water inlet pipe 18 is used to monitor the water inlet temperature, and the thermometer 20 on the water outlet pipe 19 is used to monitor the water outlet temperature, so as to timely adjust the heating device 26 to control the wastewater temperature and avoid the wastewater temperature being insufficient or too high, which affects the deammonification rate. Generally speaking, the temperature setting is related to the pH value of the wastewater, refer to Figure 5 When pH=10, below 50℃, free amino groups account for more than 95%, and the pH of wastewater is generally around 10, so the temperature is preferably between 30℃ and 45℃. Of course, it can also be adjusted according to the actual pH value of the wastewater to be treated. The pressure gauge 21 is used to monitor the inlet water pressure and the outlet water pressure, and adjust the water intake according to the inlet water pressure to avoid excessive water pressure causing damage to the hydrophobic membrane 35 or too low water pressure to effectively remove ammonia. The flow meter 22 can monitor the inlet flow rate, and in conjunction with the pressure gauge 21, the inlet flow rate can be adjusted in time.

[0045] Example 2

[0046] This embodiment provides a wastewater deammoniation system, such as Figures 1 to 5 As shown, it includes a wastewater tank 1, a liquid supply bracket 2, a liquid discharge bracket 3, a mounting bracket 4, the rotating gas membrane separation device 5 in Example 1, and a rotating mechanism. A liquid supply pipe 6 is installed on the liquid supply bracket 2, and the liquid supply pipe 6 is rotatably connected to the water inlet pipe 18 of the inner sleeve 16 of the rotating gas membrane separation device 5 and communicated with each other. A liquid discharge bracket 3 is provided with a liquid discharge pipe 7, and the liquid discharge pipe 7 is rotatably connected to the water outlet pipe 19 of the inner sleeve 16 and communicated with each other. The outer sleeve 17 of the rotating gas membrane separation device 5 is horizontally fixed on the mounting bracket 4, and the rotating mechanism is used to drive the inner sleeve 16 to rotate. The liquid in the liquid supply pipe 6 exchanges heat with the gas extracted by the vacuum pump 9 through the heat exchanger 15.

[0047] Working principle:

[0048] The wastewater in the wastewater pool 1 enters the rotating gas membrane separation device 5 through the liquid supply pipe 6 and the water inlet pipe 18. At the same time, the rotating mechanism is started to drive the inner sleeve 16 to rotate, the vacuum pump 9 is turned on, and whether to turn on the heating device 26 is selected according to the wastewater temperature. The wastewater after deammoniation through the rotating gas membrane separation device 5 is discharged through the outlet pipe 19 and the drain pipe 7, and can be directly discharged or processed in the next process. The ammonia vapor after deammoniation is discharged from the exhaust port into the heat exchanger 15 to exchange heat with the wastewater in the liquid supply pipe 6. The wastewater in the liquid supply pipe 6 is heated to achieve preheating, which can ensure that the wastewater quickly reaches a suitable evaporation temperature in the rotating gas membrane separation device 5, and the ammonia vapor is cooled to liquid ammonia. The liquid ammonia can be sent to the collection equipment to collect and form ammonia water, which is sold as an ammonia water product, or it can be further entered into the distillation tower to obtain anhydrous ammonia gas, and finally compressed and cooled to obtain a liquid ammonia product.

[0049] In one embodiment, if Figures 1 to 5 As shown, the rotating mechanism includes a driving motor 10, a driving pulley 11 and a driven pulley 12. The driving motor 10 is mounted on the liquid supply bracket 2 or the liquid discharge bracket 3. The driving pulley 11 is mounted on the output shaft of the driving motor 10, and the driven pulley 12 is coaxially fixed on the water inlet pipe 18. The driving pulley 11 and the driven pulley 12 are connected by a driving belt 13. When the driving motor 10 is started, the driving pulley 11 rotates, and the driven pulley 12 is driven to rotate through the driving belt 13, so that the water inlet pipe 18 can be driven to rotate, and then the inner sleeve 16 fixedly connected to the water inlet pipe 18 can be rotated.

[0050] In one embodiment, if Figures 1 to 5 As shown, the liquid supply pipe 6 and the water inlet pipe 18 are connected in a sealed rotation manner through a rotating bearing 14, and the liquid discharge pipe 7 and the water outlet pipe 19 are also connected in a sealed rotation manner through a rotating bearing 14. The rotating bearing 14 can be a conventional bearing with a sealing function.

[0051] In one embodiment, if Figures 1 to 5 As shown, the exhaust port of the rotating gas membrane separation device 5 is connected to an exhaust pipe 8, which is connected to the inlet end of the first heat exchange passage of the heat exchanger 15 through a vacuum pump 9, and the outlet end of the first heat exchange passage of the heat exchanger 15 is connected to a collection device through a collection pipe to collect liquid ammonia. The liquid supply pipe 6 is connected to the inlet end of the second heat exchange passage of the heat exchanger 15, and the water inlet pipe 18 is connected to the outlet end of the second heat exchange passage of the heat exchanger 15. Ammonia vapor enters the first heat exchange passage and can exchange heat with wastewater in the second heat exchange passage. Under the suction of the vacuum pump 9, the inner casing 16 and the outer casing 17 can be in a negative pressure state, which is conducive to the escape of ammonia vapor.

[0052] In one embodiment, if Figures 1 to 5As shown, the vacuum pump 9 increases the pressure to 5-10 bar, and the water temperature in the rotating gas membrane separation device 5 is heated to 30°C-45°C. The concentration of the ammonia water collected can reach 30%-60%, and this stream can be sold as a high-concentration ammonia water product. Of course, it can also be further sent to a distillation tower to obtain anhydrous ammonia gas, and finally compressed and cooled to obtain a liquid ammonia product.

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rotary gas membrane separation device, characterized in that: It includes an inner sleeve and an outer sleeve coaxially sleeved from inside to outside; The outer sleeve is arranged horizontally, and the outer sleeve and the inner sleeve are rotatably connected via a sealing bearing, and the sealing bearing divides the space between the outer sleeve and the inner sleeve into a first exhaust chamber, a heating chamber, and a second exhaust chamber, and the first exhaust chamber, the heating chamber, and the second exhaust chamber are arranged in sequence along the axial direction of the outer sleeve, a heating device is installed in the heating chamber, and the first exhaust chamber and the second exhaust chamber are both provided with exhaust ports, and the exhaust ports are connected to a vacuum pump; A water inlet pipe is provided at one end of the inner sleeve, and a water outlet pipe is provided at the other end of the inner sleeve, a first check valve is provided on the water inlet pipe, and a second check valve is provided on the water outlet pipe, a first air collecting chamber is formed between the first check valve, the inner sleeve and the water inlet pipe, the first air collecting chamber and the first exhaust chamber are positioned corresponding to each other and are interconnected, a degassing chamber can be formed between the first check valve, the inner sleeve and the second check valve, the degassing chamber and the heating chamber are positioned corresponding to each other, a separation filter element with a hydrophobic membrane is provided in the degassing chamber, the water inlet end and the water outlet end of the separation filter element are respectively connected to the water inlet pipe and the water outlet pipe, a second air collecting chamber is formed between the second check valve, the inner sleeve and the water outlet pipe, the second air collecting chamber and the second exhaust chamber are positioned corresponding to each other and are interconnected; the inner sleeve is driven to rotate during operation.

2. A rotary gas membrane separation device according to claim 1, characterized in that: Both ends of the inner sleeve are provided with end covers, and the end covers are provided with mounting holes for sealing connection of a water inlet pipe or a water outlet pipe. The two ends of the outer sleeve are connected to the end covers at both ends of the inner sleeve through sealing bearings.

3. A rotary gas membrane separation device according to claim 1, characterized in that: The heating device is a microwave heater.

4. A rotary gas membrane separation device according to claim 3, characterized in that: The first gas collecting chamber and the second gas collecting chamber are respectively communicated with the first exhaust chamber and the second exhaust chamber through the exhaust holes.

5. A rotary gas membrane separation device according to claim 1, characterized in that: The inner wall of the hydrophobic membrane on the separation filter element is coated with polytetrafluoroethylene.

6. A rotary gas membrane separation device according to claim 5, characterized in that: The polytetrafluoroethylene is coated in a three-dimensional V-shape.

7. A rotary gas membrane separation device according to claim 1, characterized in that: The water inlet pipe and the water outlet pipe are both provided with a thermometer and a pressure gauge, and the water inlet pipe is provided with a flow meter.

8. A wastewater deammoniation system, characterized in that: It includes a wastewater tank, a liquid supply bracket, a liquid discharge bracket, a mounting bracket, a rotating gas membrane separation device as described in any one of claims 1 to 7, and a rotating mechanism for driving the inner sleeve of the rotating gas membrane separation device to rotate, the liquid supply bracket is equipped with a liquid supply pipe, the liquid supply pipe is rotationally connected with the water inlet pipe of the inner sleeve, the liquid discharge bracket is provided with a liquid discharge pipe, the liquid discharge pipe is rotationally connected with the water outlet pipe of the inner sleeve, the outer sleeve of the rotating gas membrane separation device is fixed on the mounting bracket, and the liquid in the liquid supply pipe is heat exchanged with the gas extracted by the vacuum pump through a heat exchanger.

9. A wastewater deammoniation system according to claim 8, characterized in that: The rotating mechanism includes a driving motor, a driving pulley and a driven pulley. The driving motor is installed on a liquid supply bracket or a liquid discharge bracket, the driving pulley is installed on the output shaft of the driving motor, and the driven pulley is coaxially fixed on the water inlet pipe. The driving pulley and the driven pulley are connected by a driving belt.

10. A wastewater deammoniation system according to claim 8, characterized in that: The exhaust port of the rotating gas membrane separation equipment is connected to an exhaust pipe, and the exhaust pipe is connected to the inlet end of the first heat exchange passage of the heat exchanger through the vacuum pump. The outlet end of the first heat exchange passage of the heat exchanger is connected to a collecting device, the liquid supply pipe is connected to the inlet end of the second heat exchange passage of the heat exchanger, and the water inlet pipe is connected to the outlet end of the second heat exchange passage of the heat exchanger.

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