Solar energy dynamic rotary vacuum membrane distillation water treatment system

Abstract

The present application relates to the field of membrane distillation, and particularly relates to a solar dynamic rotating vacuum membrane distillation water treatment system, comprising a raw material tank, a solar heat collector, a storage tank, a rotating membrane assembly and a cooling system. The present application obtains the required shear flow velocity of the membrane surface by rotating the membrane itself, reduces the temperature difference and concentration difference polarization of the membrane surface, and effectively reduces the dependence of the system operation on the circulating flow of the feed liquid. Meanwhile, in the process of membrane distillation water treatment, solar energy can be effectively used to heat the raw material liquid, saving electric energy. The latent heat of the permeated steam on the downstream side of the membrane is recovered by using a heat exchanger to reduce the load of the solar heat collector.

Description

Technical Field

[0001] This invention relates to the field of membrane distillation, and more particularly to a solar-powered dynamic rotating vacuum membrane distillation water treatment system. Background Technology

[0002] Membrane distillation is a heat-driven membrane separation technology that uses a hydrophobic porous membrane as the separation medium. Under the condition that the feed solution does not wet the membrane pores, volatile components in the feed solution (generally referred to as the "hot side") permeate through the membrane pores as vapor due to the vapor pressure difference across the membrane. Theoretically, non-volatile components (ions, biomolecules, colloids, sugars, etc.) have a 100% rejection rate, thus achieving component separation. Therefore, membrane distillation technology has broad application potential in seawater and brackish water desalination, biomolecule concentration, and chemical feed concentration. Furthermore, the membrane distillation process is almost unaffected by the osmotic pressure of the feed solution, allowing for high concentration of small molecule solutions, even exceeding their solubility and causing precipitation. Simultaneously, the membrane distillation process can operate within a relatively low temperature range (40–70°C) and can be combined with clean or low-grade energy sources such as solar energy, geothermal energy, or industrial waste heat to reduce process energy consumption.

[0003] However, despite these advantages, membrane distillation technology has not yet achieved large-scale industrial application. One of the key reasons hindering its industrialization is its high energy consumption and low thermal efficiency. Designing and developing novel membrane distillation modules to enhance heat transfer and transmembrane mass transfer, and combining membrane distillation technology with inexpensive energy sources such as solar, geothermal, and industrial waste heat, supplemented by heat recovery, are two strategies to improve the economics of membrane distillation systems.

[0004] Traditional cross-flow membrane modules are the common choice in current membrane distillation research due to their simple structure, with hollow fiber and flat-sheet membrane modules being the most frequently reported. Flat-sheet membrane modules are simple in structure and easy to manufacture and operate, but they require support and have a low packing density. Compared to flat-sheet membrane modules, hollow fiber membrane distillation modules, while having a larger packing area, are prone to fiber adhesion and pore blockage when processing high-viscosity solutions due to their very narrow spacing, resulting in a decrease in membrane flux. Concentration polarization and temperature polarization are significant during membrane distillation. Impurities or solid components in the feed solution can easily form a gel layer or even a filter cake layer on the membrane surface, exacerbating fouling and reducing heat transfer efficiency, thus leading to a decrease in membrane flux and thermal efficiency. An effective way to avoid or mitigate these phenomena is to increase the turbulence of the feed solution on the membrane surface inside the module.

[0005] Chinese patent CN2690036Y discloses a membrane distillation apparatus, which includes a hot working fluid circulation system, a membrane module, and a cold working fluid circulation system. The hot-side inlet and outlet of the membrane module form a loop with the hot working fluid circulation system through pipelines, and the cold-side inlet and outlet of the membrane module form a loop with the cold working fluid circulation system through pipelines. The feature is that at least one hot working fluid inlet pipe with a certain length is inserted at the hot-side inlet of the membrane module, the front end of which is close to the membrane surface and the opening is set as an oblique opening, so that the inlet direction of the hot working fluid forms an angle of less than 90° with the membrane surface and tangentially rotates to scour the membrane surface, thereby destroying the temperature and concentration polarization boundary layer near the membrane surface and thus effectively improving the membrane flux.

[0006] Dynamic rotating membrane technology is a novel membrane separation technology that obtains the required shear velocity at the membrane surface through membrane rotation. On the one hand, it effectively reduces the system's dependence on feed circulation flow rate while simultaneously achieving enhanced membrane surface turbulence. On the other hand, it decouples the transmembrane driving force from the circulation flow rate, resulting in high process controllability. Chinese patent CN2925588Y discloses a rotating membrane device suitable for processing fluids with large suspended solids, high viscosity, and high concentration ratios. It allows for simultaneous membrane separation and membrane surface cleaning without fluid pretreatment, thereby reducing membrane concentration polarization, increasing membrane flux, and reducing the frequency of membrane module cleaning. Applying dynamic rotating membrane technology to membrane distillation can enhance heat and mass transfer on the hot side of the membrane and effectively control membrane operation at lower liquid pressures to prevent liquid permeation. However, to date, there are no reports of applying dynamic rotating membrane technology to membrane distillation.

[0007] Meanwhile, to improve the economic efficiency of membrane distillation, coupling membrane distillation with solar thermal collection to form solar membrane distillation technology has attracted widespread attention from companies and research institutions both domestically and internationally. Chinese patent number 2820302Y discloses a membrane distillation water treatment device that can effectively utilize solar energy or waste heat. It uses aqueous solutions of non-volatile substances as the distillation treatment object, effectively utilizing solar energy or waste heat, employing a hydrophobic membrane, and obtaining the required fresh water for domestic and drinking purposes through the membrane distillation process. Currently, approximately 25 companies, including IBM, are actively investing in the further research and development and promotion of this technology. However, despite this, the membrane flux of the aforementioned solar membrane distillation seawater desalination systems of different scales and types is generally low, typically not exceeding 10 kg / m³. 2 ·h, clearly this flux is comparable to that of the widely industrially applied reverse osmosis seawater desalination technology (12-20 kg / m³). 2 Compared to h), there is still a significant gap, so its economic viability remains unsatisfactory. Summary of the Invention

[0008] Based on the above problems, the purpose of this invention is to provide a solar-powered dynamic rotating vacuum membrane distillation water treatment system. The invention adopts the following technical solution: This invention provides a solar-powered dynamic rotating vacuum membrane distilled water treatment system, comprising a raw material tank, a heat exchanger mounted on the raw material tank, the heat exchanger being connected to a solar collector via a heat exchange circulation pipe, and a pump being mounted on the heat exchange circulation pipe; the top of the raw material tank being connected to a storage tank via a feed pipe, and a pump being mounted on the feed pipe; the bottom of the raw material tank being connected to a rotating membrane assembly via a feed pipe, and a pump being mounted on the feed pipe; the top of the rotating membrane assembly being connected to the raw material tank via a return pipe; and the bottom of the rotating membrane assembly being connected to a cooling system via an outlet pipe, and the liquid outlet of the cooling system being connected to a product water tank via an outlet pipe. The rotating membrane assembly includes a sealing housing. A return pipe interface is located at the top of the sealing housing and connected to the return pipe. A feed pipe interface is located at the bottom of the sealing housing and connected to the feed pipe. Multiple membrane plates are arranged at intervals within the sealing housing. One membrane sheet is mounted on each of the upper and lower surfaces of each membrane plate. Permeate flow channels are provided on both the upper and lower surfaces of each membrane plate. The membrane plates are mounted on a vertically arranged rotating shaft. A permeate collection chamber is axially arranged inside the rotating shaft. Through-holes are provided on the outer wall of the rotating shaft corresponding to the membrane plate mounting positions. One end of each through-hole communicates with the permeate flow channel, and the other end extends radially inward to communicate with the permeate collection chamber. The lower end of the rotating shaft is rotatably and sealingly connected to the sealing housing, and a steam outlet communicating with the permeate collection chamber is located at the lower end of the rotating shaft. The steam outlet is connected to the outlet pipe.

[0009] Preferably, the cooling system includes a cooling supply pipe, a cooling return pipe, a precooler, and a condenser; the cooling return pipe is connected to the top of the storage tank; the cooling supply pipe is connected to the feed pipe, and the interface between the cooling supply pipe and the feed pipe is located downstream of the second pump; the liquid inlet of the precooler is connected to the first outlet pipe, the liquid outlet of the precooler is connected to the liquid inlet of the condenser via the second outlet pipe, and the liquid outlet of the condenser is connected to the product water tank via the third outlet pipe; the cooling liquid outlet at the top of the precooler is connected to the cooling supply pipe and the cooling return pipe via the first and second branch pipes respectively; the cooling liquid outlet at the bottom of the precooler is connected to the cooling liquid outlet at the bottom of the condenser via the third branch pipe, and the cooling liquid outlet at the top of the condenser is connected to the cooling supply pipe via the fourth branch pipe; the third branch pipe is provided with a fifth and a sixth branch pipe connected to the cooling return pipe; the top of the product water tank is connected to a vacuum pipe, and a vacuum pump is provided on the vacuum pipe.

[0010] Preferably, a backup cooler is provided on the cooling pipe.

[0011] Preferably, a filter is provided on the feeding pipe.

[0012] Preferably, the top of the sealed housing is provided with a vent.

[0013] Preferably, the lower end of the rotating shaft is connected to the motor via a belt.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention achieves the required shear flow rate at the membrane surface by rotating the membrane itself, thereby reducing the temperature difference and concentration polarization at the membrane surface and effectively reducing the system's dependence on the feed liquid circulation flow rate. At the same time, during the membrane distillation water treatment process, solar energy can be effectively used to heat the feed liquid, saving electrical energy. Furthermore, the latent heat of the permeate steam downstream of the membrane is recovered using a heat exchanger, thereby reducing the load on the solar collector. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of the solar-powered dynamic rotating vacuum membrane distilled water treatment system of the present invention; Figure 2 This is a schematic diagram of the structure of the rotating membrane assembly of the present invention; Figure 3 This is a schematic diagram of the installation of the diaphragm plate and diaphragm sheet of the present invention; Figure 4 This is a schematic diagram of the flow path of seawater as a cooling liquid in this invention; Figure 5 This is a schematic diagram of the second path through which seawater, as a cooling liquid, flows in this invention; Figure 6 This is a schematic diagram of the flow path of seawater as a cooling liquid in this invention.

[0017] Explanation of reference numerals in the attached diagram: T1-T11 are temperature sensors; L1 is a liquid level sensor; C1 is a conductivity sensor; P1 is a pressure gauge; P2 is an electrical contact vacuum gauge; VA1-VA3 are all solenoid valves; B1 is pump two; B2 is pump one; B3 is pump three; B4 is a vacuum pump; 201 is a solar collector; 202 is a raw material tank; 203 is a rotating membrane module; 204 is a storage tank; 205 is a precooler; 206 is a standby cooler; 207 is a condenser; 208... 209 is the product water tank; 210 is the filter; 211 is the heat exchanger; 212 is the heat exchange circulation pipe; 213 is the feed pipe; 214 is the return pipe; 215 is the first liquid outlet pipe; 216 is the third liquid outlet pipe; 217 is the cooling supply pipe; 218 is the cooling return pipe; 219 is the second liquid outlet pipe; 220 is the first branch pipe; 221 is the second branch pipe; 222 is the third branch pipe; 223 is the fourth branch pipe; 224 is the fifth branch pipe; 225 is the sixth branch pipe; 226 is the vacuum pipe. 203-1 is the sealed housing; 203-2 is the return pipe interface; 203-3 is the feed pipe interface; 203-4 is the diaphragm plate; 203-5 is the diaphragm sheet; 203-6 is the rotating shaft; 203-7 is the permeate collection chamber; 203-8 is the steam outlet; 203-9 is the vent; 203-10 is the motor; 203-11 is the permeate guide channel; 203-12 is the through port. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 and 2 As shown, this embodiment discloses a solar-powered dynamic rotating vacuum membrane distilled water treatment system, including a raw material tank 202. A heat exchanger 210 is installed on the raw material tank 202, and the heat exchanger 210 is connected to a solar collector 201 via a heat exchange circulation pipe 211. A pump B2 is installed on the heat exchange circulation pipe 211. The solar collector 201 can be a flat plate type or a vacuum tube type, etc. After the water in the solar collector 201 is heated, it is pumped to the heat exchanger 210 via pump B2 to heat the raw material liquid in the raw material tank 202. The heat exchanger 210 is a coil-type heat exchanger installed inside the raw material tank 202. Pump B2 is coupled to a temperature sensor at the bottom of the raw material tank 202. When the temperature of the raw material liquid reaches a set value, pump B2 stops operating; when it falls below a certain value, it automatically restarts. In this embodiment, pump B2 is a centrifugal pump.

[0020] The top of the raw material tank 202 is connected to the storage tank 204 via a feed pipe 212, and a second pump B1 is installed on the feed pipe 212. The bottom of the raw material tank 202 is connected to the rotating membrane assembly 203 via a feed pipe 213, and a third pump B3 is installed on the feed pipe 213. The top of the rotating membrane assembly 203 is connected to the raw material tank 202 via a return pipe 214; the bottom of the rotating membrane assembly 203 is connected to the cooling system via an outlet pipe 215, and the liquid outlet of the cooling system is connected to the product water tank 208 via an outlet pipe 216. In this embodiment, the second pump B1 is a centrifugal pump, and the third pump B3 is a magnetic pump.

[0021] like Figure 2 and 3 As shown, the rotating membrane assembly 203 includes a sealing housing 203-1. The top of the sealing housing 203-1 is provided with a return pipe interface 203-2, which is connected to the return pipe 214. The bottom of the sealing housing 203-1 is provided with a feeding pipe interface 203-3, which is connected to the feeding pipe 213. The sealing housing 203-1 is provided with a plurality of membrane plates 203-4 arranged at intervals. Each of the upper and lower surfaces of the membrane plate 203-4 is equipped with a membrane sheet 203-5.

[0022] The upper and lower surfaces of the membrane plate 203-4 are provided with permeate guiding channels 203-11. The membrane plate 203-4 is mounted on a vertically arranged rotating shaft 203-6. The rotating shaft 203-6 has a permeate collecting chamber 203-7 arranged axially inside. The outer wall of the rotating shaft 203-6 is provided with through openings 203-12 corresponding to the installation positions of the membrane plate 203-4. One end of the through opening 203-12 is connected to the permeate guiding channel 203-11, and the other end extends radially inward to connect with the permeate collecting chamber 203-7. The lower end of the rotating shaft 203-6 is rotatably sealed to the sealing shell 203-1, and the lower end of the rotating shaft 203-6 is provided with a steam outlet 203-8 that communicates with the permeate collecting chamber 203-7. The steam outlet 203-8 is connected to the liquid outlet pipe 215.

[0023] The membrane plate 203-4 can be made of ABS or polycarbonate (PC). The sealing method between the membrane sheet 203-5 and the membrane plate 203-4 can be mechanical pressing, adhesive bonding, ultrasonic welding, etc. The membrane sheet 203-5 is a flat membrane, which can be made of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polypropylene (PP), polyethylene (PE), or polyethersulfone (PES), or a modified membrane. In this embodiment, sealing grooves are provided on the inner and outer edges of the membrane plate 203-4. After the adhesive is filled into the sealing grooves, the edge of the membrane sheet 203-5 is then inserted into the sealing grooves to complete the sealing.

[0024] In this embodiment, a vent 203-9 is provided on the top of the sealing housing 203-1. The lower end of the rotating shaft 203-6 is powered by a motor 203-10 via a belt.

[0025] like Figure 1 As shown, in this embodiment, the cooling system includes a cooling supply pipe 217, a cooling return pipe 218, a precooler 205, and a condenser 207. The cooling return pipe 218 is connected to the top of the storage tank 204. The cooling supply pipe 217 is connected to the feed pipe 212, and the interface between the cooling supply pipe 217 and the feed pipe 212 is located downstream of pump B1. The liquid inlet of the precooler 205 is connected to the liquid outlet pipe 215, the liquid outlet of the precooler 205 is connected to the liquid inlet of the condenser 207 through the liquid outlet pipe 219, and the liquid outlet of the condenser 207 is connected to the product water tank 208 through the liquid outlet pipe 216. The coolant port at the top of the precooler 205 is connected to the cooling supply pipe 217 and the cooling return pipe 218 via branch pipe 1 220 and branch pipe 221 respectively; the coolant port at the bottom of the precooler 205 is connected to the coolant port at the bottom of the condenser 207 via branch pipe 3 222; and the coolant port at the top of the condenser 207 is connected to the cooling supply pipe 217 via branch pipe 4 223.

[0026] Branch pipe 3 222 is equipped with branch pipe 5 224 and branch pipe 6 225. Branch pipe 3 222 is connected to the return cooling pipe 218 through branch pipe 5 224 and branch pipe 6 225. The top of the product water tank 208 is connected to the vacuum pipe 226, and the vacuum pump B4 is installed on the vacuum pipe 226.

[0027] In this embodiment, a backup cooler 206 is provided on the cooling pipe 217. A filter 209 is provided on the feeding pipe 213.

[0028] In this embodiment, T1-T11 are temperature sensors; L1 is a liquid level sensor; C1 is a conductivity sensor; P1 is a pressure gauge; P2 is an electrical contact vacuum gauge; and VA1-VA3 are all solenoid valves. All of these components are installed on their respective pipelines. This processing system uses a PLC control system with a touchscreen interface and is equipped with a digital recorder capable of storing data. It has 11 temperature acquisition points, 1 conductivity acquisition point, multiple solenoid valves, and liquid level feedback points. Important process operation data is recorded and displayed by the recorder and transmitted to the PLC via a Modbus bus, then displayed on the touchscreen. The system can display the equipment's operating status in real time, dynamically showing the temperature, on / off status, and operating status of all monitored locations in different colors. It can also adjust process parameters, operate equipment, trigger alarms, and record historical data and trends for pressure, temperature, and flow.

[0029] The working principle of the present invention is as follows: (1) The hot pure water in the solar water heater 201 is input into the heat exchanger 210 in the raw material tank 202 by pump B2, which heats the liquid in the raw material tank 202 to a specified temperature. The temperature is monitored by temperature sensor T3 and fed back to control pump B2.

[0030] (2) The raw material liquid is fed into the raw material tank 202 from the storage tank 204 via the feed pump B1. At the same time, the liquid in the raw material tank 202 is fed into the rotary membrane assembly 203 via pump B3 and circulated back to the raw material tank 202 through the return pipe 214. At this time, the start motor 203-10 drives each membrane plate 203-4 to rotate at the set speed via the belt and the rotating shaft 203-6. After the liquid level in the raw material tank 202 reaches the set value, the solenoid valve VA2 on the feed pipe 212 is automatically closed. After the system produces water normally, the liquid level in the raw material tank 202 is automatically controlled by its liquid level sensor L1. When the liquid level is high, the solenoid valve VA2 is automatically closed, and when the liquid level is low, VA2 is automatically opened for feeding.

[0031] The rotating membrane module 203 obtains the required shear flow rate on the membrane surface by rotating the membrane itself, which reduces the temperature difference and concentration polarization on the membrane surface, and effectively reduces the dependence of the system operation on the feed liquid circulation flow rate.

[0032] (3) After the seawater temperature in the rotating membrane module 203 reaches the set value, manually close valve V1 on the outlet pipe 215 and turn on vacuum pump B4 to make the product water tank 208 in a negative pressure environment. After the vacuum degree in the vacuum tube 226 reaches the set value, manually open valve V1 on the outlet pipe 215 to carry out the VMD process. Due to the vacuum effect, a vapor pressure difference is generated on both sides of the membrane 203-5, which drives the vapor on the upstream side of the membrane to be transferred to the downstream side of the membrane, and then the vapor enters the permeate collection chamber 203-7 and enters the outlet pipe 215 through the steam outlet 203-8. After the transmembrane vapor is condensed, it flows through the online conductivity sensor C1 for online monitoring, and then flows into the product water tank 208 for storage.

[0033] (4) During the VMD process, the raw material liquid in the storage tank 204 is also used as the system coolant. Depending on the situation, it flows through three different paths for cooling. Users can adjust the flow path as needed.

[0034] Path 1: Driven by pump 2B1, the coolant flows only through condenser 207. Its coolant path is: feed pipe 212, cooling supply pipe 217, branch pipe 4 223, condenser 207, branch pipe 6 225, return cooling pipe 218. The coolant flow direction is as follows: Figure 4 As shown.

[0035] Path Two: Driven by pump B1, the coolant flows sequentially through condenser 207 and precooler 205. The coolant flow sequence is: feed pipe 212, cooling supply pipe 217, branch pipe four 223, condenser 207, branch pipe three 222, precooler 205, branch pipe two 221, and return cooling pipe 218. The coolant flow direction is as follows: Figure 5 As shown.

[0036] Path 3: Driven by pump 2B1, the coolant flows simultaneously through condenser 207 and precooler 205. Its coolant path is via feed pipe 212 and cooling supply pipe 217. At the end of cooling supply pipe 217, the coolant flows into branch pipe 4 223 and branch pipe 1 220 respectively. The coolant flowing into branch pipe 4 223 passes sequentially through condenser 207, branch pipe 3 222, and branch pipe 6 225 before flowing into return cooling pipe 218. The coolant flowing into branch pipe 1 220 passes sequentially through precooler 205, branch pipe 3 222, and branch pipe 5 224 before flowing into return cooling pipe 218. The coolant flow direction is as follows: Figure 6 As shown.

[0037] It should be noted that valves are installed on the pipes between branch pipes 224 and 225 on branch pipe 3 222 to control the flow of coolant. It should also be noted that valves are installed on other pipes and branches as well.

[0038] (5) If the temperature sensor T11 in the storage tank 204 rises to the set value, you can choose whether to turn on the backup cooler 206, that is, cool the seawater raw material liquid through the heat exchanger 206 via an external cold source.

[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A solar-powered dynamic rotating vacuum membrane distillation water treatment system, characterized in that: Includes a raw material tank (202), on which a heat exchanger (210) is provided, the heat exchanger (210) is connected to a solar collector (201) through a heat exchange circulation pipe (211), and a pump (B2) is provided on the heat exchange circulation pipe (211). The top of the raw material tank (202) is connected to the storage tank (204) through the feeding pipe (212), and the feeding pipe (212) is equipped with a second pump (B1). The bottom of the raw material tank (202) is connected to the rotating membrane assembly (203) through the feeding pipe (213), and the feeding pipe (213) is equipped with a third pump (B3). The top of the rotating membrane assembly (203) is connected to the raw material tank (202) via a return pipe (214); the bottom of the rotating membrane assembly (203) is connected to the cooling system via an outlet pipe (215); and the liquid outlet of the cooling system is connected to the product water tank (208) via an outlet pipe (216). The rotating membrane assembly (203) includes a sealing housing (203-1), a return pipe interface (203-2) at the top of the sealing housing (203-1) and a return pipe (203-2) connected to the return pipe (214), a feed pipe interface (203-3) at the bottom of the sealing housing (203-1) and a feed pipe (203-3) connected to the feed pipe (213), a plurality of membrane plates (203-4) arranged vertically and horizontally in the sealing housing (203-1), a membrane sheet (203-5) mounted on the upper and lower surfaces of each membrane plate (203-4), and permeate guiding channels (203-11) provided on both the upper and lower surfaces of each membrane plate (203-4). The membrane plate (203-4) is arranged on a vertically arranged rotating shaft. On the rotating shaft (203-6), an axial permeate collection chamber (203-7) is provided inside the rotating shaft (203-6); a through port (203-12) is provided on the outer wall of the rotating shaft (203-6) corresponding to the installation position of the membrane plate (203-4). One end of the through port (203-12) is connected to the permeate guide channel (203-11), and the other end extends radially inward to connect with the permeate collection chamber (203-7). The lower end of the rotating shaft (203-6) is rotatably sealed to the sealing shell (203-1), and the lower end of the rotating shaft (203-6) is provided with a steam outlet (203-8) connected to the permeate collection chamber (203-7). The steam outlet (203-8) is connected to the liquid outlet pipe (215).

2. The solar-powered dynamic rotating vacuum membrane distillation water treatment system according to claim 1, characterized in that: The cooling system includes a cooling supply pipe (217), a cooling return pipe (218), a precooler (205), and a condenser (207). The cooling return pipe (218) is connected to the top of the storage tank (204); The cooling pipe (217) is connected to the feed pipe (212), and the interface between the cooling pipe (217) and the feed pipe (212) is located downstream of the second pump (B1); The liquid inlet of the precooler (205) is connected to the first liquid outlet pipe (215), the liquid outlet of the precooler (205) is connected to the liquid inlet of the condenser (207) through the second liquid outlet pipe (219), and the liquid outlet of the condenser (207) is connected to the water production tank (208) through the third liquid outlet pipe (216). The coolant port at the top of the precooler (205) is connected to the cooling supply pipe (217) and the cooling return pipe (218) respectively through branch pipe one (220) and branch pipe two (221); the coolant port at the bottom of the precooler (205) is connected to the coolant port at the bottom of the condenser (207) through branch pipe three (222); and the coolant port at the top of the condenser (207) is connected to the cooling supply pipe (217) through branch pipe four (223). The third branch pipe (222) is connected to the return cooling pipe (218) through the fifth branch pipe (224) and the sixth branch pipe (225); The top of the water production tank (208) is connected to a vacuum pipe (226), and a vacuum pump (B4) is installed on the vacuum pipe (226).

3. The solar-powered dynamic rotating vacuum membrane distillation water treatment system according to claim 1, characterized in that: A backup cooler (206) is provided on the cooling pipe (217).

4. The solar-powered dynamic rotating vacuum membrane distillation water treatment system according to claim 1, characterized in that: A filter (209) is provided on the feed pipe (213).

5. The solar-powered dynamic rotating vacuum membrane distillation water treatment system according to claim 1, characterized in that: The top of the sealed housing (203-1) is provided with a vent (203-9).

6. The solar-powered dynamic rotating vacuum membrane distillation water treatment system according to claim 1, characterized in that: The lower end of the rotating shaft (203-6) is connected to the motor (203-10) via a belt.

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