A modularly assembled seawater desalination unit

Abstract

This invention provides a modularly assembled seawater desalination device, comprising a desalination component, a water supply component, and a secondary heating component, which together form a secondary steam heating circuit. The secondary heating component is also connected to an external steam inlet pipe for initial heating of the evaporation component. The desalination component includes multiple sets of first frames, each containing an evaporation component, and each evaporation component is connected to a condensation component via pipes. The condensation component includes a condensation shell, a flow divider, and a condenser, with spiral blades mounted on the condenser. The secondary heating component is linked to the evaporation component. This invention, through the coordinated structure of the spiral blades and the flow divider, enables the device to form a swirling flow field through the spiral blades, extending the residence time of steam in the condensation shell, improving heat exchange efficiency, reducing salt spray droplets entrained in the steam, reducing the mixing of salt spray and condensate, and improving the reliability of the device.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination equipment technology, and more specifically, to a modularly assembled seawater desalination equipment. Background Technology

[0002] In the supply of drinking water in coastal and island areas, seawater often needs to be purified before it can be used in order to alleviate the shortage of freshwater resources and ensure the demand for drinking water for domestic and industrial use. At this time, it is necessary to use seawater desalination equipment to desalinate, purify and produce freshwater from seawater, so as to directly obtain packaged drinking water or domestic drinking water that meets hygiene standards.

[0003] During the operation of seawater desalination plants, calcium, magnesium, and other salts in the seawater precipitate and adhere to the heat exchange surface after being heated, forming a salt scale layer. When the seawater evaporates to form steam, the steam passes through the salt scale layer and is easily entrained by salt mist droplets due to the rough surface of the salt scale and airflow disturbance. However, existing devices are usually straight tube bundles or simple tube structures, and the steam flows in a straight line inside the shell, making it difficult to separate the steam carrying salt mist. This easily leads to the steam and salt mist droplets mixing and condensing, resulting in a high salt content in the freshwater, reducing the utilization efficiency and drinking quality of the freshwater, and affecting the quality of the water produced by the plant. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a modularly assembled seawater desalination device, which solves the technical problem that existing devices have relatively simple structures and are difficult to separate steam and salt spray.

[0005] The purpose and effectiveness of the modularly assembled seawater desalination device of the present invention are achieved by the following specific technical means: This invention provides a modularly assembled seawater desalination device, including a desalination component, a water supply component, and a secondary heating component, which together form a secondary steam heating circuit. The secondary heating component is also connected to an external steam inlet pipe for initial heating of the evaporation component. The desalination component includes multiple sets of first frames, each containing an evaporation component, and each evaporation component is connected to a condensation component via pipes. The condensation component includes a condensation shell, a flow divider, and a condenser. The condenser is fitted with spiral blades, which guide steam to form a swirling flow. The flow divider collects condensate and salt spray droplets respectively. The secondary heating component is linked to the evaporation component, and the water supply component supplies pretreated seawater to the evaporation component.

[0006] In a preferred embodiment, one end of the desalination component is provided with multiple sets of second frames, and one side of the desalination component is provided with a third frame and a fourth frame respectively. The multiple sets of second frames, the third frame and the fourth frame are detachably connected to the multiple sets of first frames by multiple sets of bolts.

[0007] In a preferred embodiment, both the water supply assembly and the secondary heating assembly are installed within multiple sets of the second frame. The water supply assembly includes a water supply pipe with multiple sets of water outlets. The multiple sets of water supply pipe outlets are respectively sealed and connected to the multiple sets of evaporation assemblies through multiple sets of quick-connect fittings for uniformly supplying seawater.

[0008] In a preferred embodiment, an ultrafilter and a sand filter are connected in series at the water inlet end of the water supply pipe. The ultrafilter and the sand filter are respectively installed in the third frame and the fourth frame. The sand filter works in conjunction with the ultrafilter to pretreat seawater.

[0009] In a preferred embodiment, the secondary heating assembly includes a first steam supply pipe, a heating pipe, and a second steam supply pipe that are sequentially and sealed together. The first steam supply pipe is connected to the steam outlet of one set of evaporation assemblies, and the second steam supply pipe is connected to the steam inlet of the other set of evaporation assemblies.

[0010] As a preferred embodiment, both the first steam pipe and the second steam pipe are equipped with a fan, which drives the secondary steam to flow in the heating circuit. The heating pipe is equipped with a spiral heat exchanger, which is used to heat the secondary steam.

[0011] As a preferred embodiment, multiple evaporation components are connected by flanges. Each evaporation component includes an evaporation shell, and a first sealing plate and a second sealing plate are fixed inside the evaporation shell. The second sealing plate has a steam hole for discharging secondary steam, and multiple sets of evenly distributed evaporation tubes are inserted between the first sealing plate and the second sealing plate.

[0012] In a preferred embodiment, a steam guide pipe is installed at the end of the second sealing plate away from the first sealing plate. The steam inlet end of the steam guide pipe covers multiple sets of the evaporation tubes, and the steam outlet end of the steam guide pipe passes through the side wall of the evaporation shell and is sealed to the condensation assembly. The steam guide pipe is used to guide the steam in the evaporation tubes into the condensation assembly.

[0013] As a preferred embodiment, a water distribution ring pipe is also installed between the first sealing plate and the second sealing plate by screws. The water inlet end of the water distribution ring pipe passes through the evaporation shell and is sealed to the water supply assembly. The water distribution ring pipe is sleeved on the outside of multiple sets of evaporation tubes and is evenly arranged around the multiple sets of evaporation tubes. The water distribution ring pipe is used to evenly spray pretreated seawater onto the outer wall of the multiple sets of evaporation tubes.

[0014] In a preferred embodiment, the bottom of the diverter plate is connected to a first guide ring pipe and a second guide ring pipe, respectively. The first guide ring pipe is used to connect to an external freshwater storage tank, and the second guide ring pipe is used to connect to an external concentrated brine discharge tank. In the secondary steam heating circuit, the secondary steam generated by the evaporation component is heated by the secondary heating component and then returned to the evaporation component to realize the recycling of secondary steam.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the coordinated structure of the spiral blades on the outer side of the condenser and the flow divider plate, enables the device to guide the steam generated by evaporation in a swirling flow, thereby improving the steam condensation and salt mist separation efficiency of the device. The device can form a swirling flow field through the spiral blades, prolonging the residence time of steam in the condenser shell and improving the contact heat exchange efficiency between steam and the heat exchange surface. During operation, the swirling flow field can reduce the amount of salt mist droplets entrained in the steam, reducing the mixing of salt mist and condensate. This improves the overall capabilities of the device in freshwater purification, scale prevention, and heat exchange, and reduces the problems of high steam velocity, poor separation effect, and easy scaling and degradation of existing straight tube bundle condensers, thereby improving the purity of freshwater and the reliability of continuous operation of the device.

[0016] 2. When using this device, the device can achieve initial startup and thermal energy recycling through the cooperation of external steam access pipeline and secondary steam circulation loop. This allows the device to enter stable desalination conditions without continuously relying on external high-power heat sources, improving the energy utilization rate and startup response speed of the device. Furthermore, the modular rapid assembly, transportation, and expansion deployment of the device are achieved through multiple sets of detachable frame connections and quick-connect sealing structures, simplifying on-site installation procedures, reducing operation and maintenance difficulties, and providing adaptability for scenarios such as island and coastal emergency water supply. This enhances the practicality of the device in terms of engineering deployment, energy-saving operation, and scenario adaptation.

[0017] 3. This invention, through the arrangement of water distribution ring pipes uniformly arranged on the outside of the evaporation tubes and the multi-stage seawater pretreatment components, enables the device to pre-purify seawater and uniformly distribute the evaporation film, thereby improving the seawater pretreatment effect and the uniformity of evaporation heat exchange. The device can remove suspended impurities and particulate matter from seawater through sand filters and ultrafilters, and then uniformly spray seawater onto the outer walls of multiple evaporation tubes through the water distribution ring pipes, so that the seawater forms a uniform liquid film on the heat exchange surface, reducing local dry burning and scale buildup, improving the device's ability to resist pollution, uniform heat exchange and desalination water stability, slowing down the scaling rate on the heat exchange surface, extending the cleaning cycle, and further reducing overall operating energy consumption and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly structure of the invention; Figure 2This is a schematic diagram of the disassembled structure of the invention; Figure 3 This is a schematic diagram of the water supply component assembly structure of the invention; Figure 4 This is a schematic diagram of the assembly structure of the secondary heating component of the invention; Figure 5 This is a cross-sectional view of the secondary heating component of the invention; Figure 6 This is a schematic diagram of the evaporation component assembly structure of the invention; Figure 7 This is a schematic diagram of the disassembled structure of the evaporation component of the invention; Figure 8 This is a cross-sectional view of the evaporation assembly of the invention; Figure 9 This is a schematic diagram of the condenser assembly structure of the invention; Figure 10 This is a schematic diagram of the disassembled structure of the condenser component of the invention; Figure 11 This is a cross-sectional view of the condenser assembly of the invention; Figure 12 This is a schematic diagram of the secondary steam heating circuit structure of the invention; Figure 13 This is a block diagram illustrating the principle of the invention.

[0019] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows: 11. First frame; 12. Second frame; 13. Third frame; 14. Fourth frame; 21. Condenser shell; 22. Diverter plate; 23. Condenser; 24. Spiral blades; 25. First guide ring pipe; 26. Second guide ring pipe; 31. Water supply pipe; 32. Ultrafilter; 33. Sand filter; 41. First steam supply pipe; 42. Heating pipe; 43. Second steam supply pipe; 44. Spiral heat exchanger; 45. Fan; 51. Evaporator shell; 52. First sealing plate; 53. Second sealing plate; 54. Evaporator pipe; 55. Steam guide pipe; 56. Water distribution ring pipe. Detailed Implementation

[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0021] Example:

[0022] like Figures 1 to 2As shown, this invention provides a modularly assembled seawater desalination device. The device consists of a desalination component, a water supply component, a secondary heating component, and a condensation component. Each component is built on a standardized framework, enabling modular assembly and detachable connection, facilitating transportation, installation, maintenance, and expansion. The desalination component, water supply component, and secondary heating component are sealed together via pipelines to form a secondary steam heating circuit. The secondary heating component is connected to an external steam inlet pipeline for initial heating of the evaporation components, solving the problem of insufficient secondary steam heating during initial startup. The desalination component includes multiple sets of first frames 11, each housing an evaporation component. These evaporation components are sealed together with the condensation component via pipelines, achieving steam condensation and salt mist separation. The water supply component supplies pretreated seawater to the evaporation components, ensuring stable evaporation. Users can connect an external controller to each actuator via wiring to control the entire process. Each frame's outer surface is covered with polyurethane insulation panels, which are fixed to the frame with stainless steel bolts and are removable and replaceable. The insulation panels are coated with a waterproof and corrosion-resistant layer, which reduces heat loss during operation, ensuring heating efficiency and condensation, while also preventing salt spray and moisture corrosion of the frame structure, extending its service life. The edges of the insulation panels are sealed with sealant to prevent heat loss through gaps, further enhancing the insulation effect.

[0023] The desalination unit is the component of this device that realizes seawater evaporation and generates secondary steam. It includes multiple sets of first frames 11 and multiple sets of evaporation components. The multiple sets of evaporation components are connected by flange seals to ensure no steam leakage and to enable multiple sets of evaporation components to work together to improve desalination efficiency. The first frame 11 is a cuboid structure. The inner side of the frame is welded with a base plate for fixing the evaporation components. The evaporation components are fixed in the first frame 11 with stainless steel bolts to ensure that the evaporation components are installed firmly and to prevent the components from loosening due to vibration during operation. The multiple sets of first frames 11 are detachably connected by high-strength stainless steel bolts. Fluororubber sealing rings are installed at the bolt connections to ensure the sealing of the connection points and reduce steam and seawater leakage. Each first frame 11 is equipped with adjustable feet at the bottom, and the bottom of the feet is equipped with anti-slip pads to adapt to different ground flatness, ensure the stability of the device, and prevent vibration during operation. The outer surface of the first frame 11 is covered with polyurethane insulation board, and insulation adhesive is applied between the insulation board and the first frame 11 to further improve the insulation effect, reduce heat loss during operation of the evaporation components, ensure stable evaporation temperature, and improve evaporation efficiency.

[0024] like Figures 2 to 8As shown, the evaporation assembly includes an evaporator shell 51, a first sealing plate 52, a second sealing plate 53, an evaporator tube 54, a steam guide pipe 55, and a water distribution ring pipe 56. All parts are made of stainless steel, and their surfaces are polished and treated with anti-corrosion coatings to prevent seawater salt adhesion and corrosion. The evaporator shell 51 has a cylindrical structure. The evaporator shell 51 is sealed to the first sealing plate 52 and the second sealing plate 53 by stainless steel bolts. Sealing gaskets are installed at the connection points to ensure the airtightness of the evaporator shell 51 and prevent seawater and steam leakage. The side wall of the evaporator shell 51 has through holes for connecting to the water distribution ring pipe 56. The first sealing plate 52 and the second sealing plate 53 are both circular structures with a diameter consistent with the inner diameter of the evaporator shell 51. Both the first sealing plate 52 and the second sealing plate 53 have through holes that match the evaporator tube 54. The number of through holes is the same as the number of evaporator tubes 54 and they are evenly distributed on the sealing plates. The inner wall of the through holes has sealing grooves for installing sealing rings to ensure a sealed connection between the evaporator tube 54 and the sealing plate.

[0025] The evaporator tubes 54 are seamless stainless steel tubes. Multiple sets of evaporator tubes 54 are evenly inserted into the through holes of the first sealing plate 52 and the second sealing plate 53. Both ends of the evaporator tubes 54 are sealed to the sealing grooves of the sealing plates via sealing rings, ensuring no leakage between the evaporator tubes 54 and the sealing plates. The even distribution of multiple sets of evaporator tubes 54 ensures that seawater can be evenly sprayed onto the outer wall of the evaporator tubes 54, improving evaporation efficiency. The evaporator tubes 54 conduct heat, causing the seawater sprayed onto their outer wall to evaporate and generate secondary steam. The second sealing plate 53 has steam holes for discharging the secondary steam, located on the outside of the multiple sets of evaporator tubes 54. This ensures that the secondary steam generated by the evaporator tubes 54 evaporating seawater can be discharged through the steam holes, preventing steam from accumulating inside the evaporator shell 51 and affecting evaporation efficiency. The inner wall of the steam holes is polished to reduce steam flow resistance and salt spray adhesion, preventing clogging of the steam holes.

[0026] A steam guide pipe 55 is installed at the end of the second sealing plate 53 furthest from the first sealing plate 52. The steam guide pipe 55 is made of seamless stainless steel. The steam inlet end of the steam guide pipe 55 is fixedly connected to the second sealing plate 53 by stainless steel bolts. A sealing gasket is installed at the connection to ensure sealing performance. The steam inlet end of the steam guide pipe 55 is funnel-shaped, covering the outlet ends of multiple sets of evaporator tubes 54, which can collect the steam in the multiple sets of evaporator tubes 54 and prevent steam leakage. The steam outlet end of the steam guide pipe 55 passes through the side wall of the evaporator shell 51 and is sealed to the condenser assembly. The connection between the steam guide pipe 55 and the side wall of the evaporator shell 51 is sealed by a flange made of stainless steel. A sealing ring is installed at the connection to ensure no steam leakage, so that the steam in the evaporator tubes 54 can be stably introduced into the condenser assembly, providing a basis for subsequent condensation and salt spray separation.

[0027] A water distribution ring pipe 56, made of stainless steel, is installed between the first sealing plate 52 and the second sealing plate 53 via screws. The water inlet end of the water distribution ring pipe 56 passes through the side wall of the evaporator shell 51 and is sealed to the water supply assembly to control the amount of seawater entering. A sealing gasket is installed at the connection between the water distribution ring pipe 56 and the side wall of the evaporator shell 51 to ensure no seawater leakage. The water distribution ring pipe 56 is sleeved around the outside of multiple sets of evaporator tubes 54 and evenly distributed around them. The side of the water distribution ring pipe 56 facing the evaporator tubes 54 has evenly distributed spray holes, facilitating the even spraying of pretreated seawater onto the outer wall of the multiple sets of evaporator tubes 54. This ensures sufficient contact between the seawater and the multiple sets of evaporator tubes 54, forming a uniform water film, improving evaporation efficiency, reducing scaling caused by localized seawater accumulation, and extending the service life of the evaporator tubes 54. A stainless steel water pump and valve are installed at the inlet end of the water distribution ring pipe 56. The pump and valve are used to pressurize and deliver the pretreated seawater in the water supply components to the water distribution ring pipe 56. The valve is used to control the spray flow rate of the seawater. It can be adjusted according to the evaporation efficiency requirements to ensure that the seawater spray volume matches the evaporation volume and avoid water waste or dry burning caused by insufficient spraying.

[0028] The desalination unit has multiple sets of second frames 12 at one end, and third frames 13 and fourth frames 14 on the other side. These sets of second frames 12, third frames 13, and fourth frames 14 are detachably connected to multiple sets of first frames 11 via multiple sets of stainless steel bolts. Each frame connection point has corresponding bolt holes. During connection, the bolt holes are aligned, bolts are inserted, and nuts are tightened. Sealing rings are installed at the connection points to ensure sealing and stability, while also facilitating disassembly, transportation, and maintenance. The inner side of the second frames 12 is welded with brackets and pipe fixing clips for installing the water supply and secondary heating components. Both brackets and fixing clips are made of stainless steel to ensure stable installation and prevent shaking during equipment operation. The outer surface of the second frames 12 is covered with polyurethane insulation board, which is fixedly connected to the second frames 12 to reduce heat loss during operation of the water supply and secondary heating components, ensuring stable water supply temperature and heating efficiency.

[0029] Both the third frame 13 and the fourth frame 14 are cuboid structures, with a base plate and support fixed inside for mounting the ultrafilter 32 and the sand filter 33 respectively, ensuring their stable installation and reducing vibration during operation. The outer surfaces of both the third frame 13 and the fourth frame 14 are covered with polyurethane insulation panels to reduce seawater temperature loss during pretreatment. Adjustable feet are installed at the bottom of both the third frame 13 and the fourth frame 14, consistent with the foot structure of the first frame 11, facilitating overall adjustment of the device's flatness.

[0030] Both the water supply assembly and the secondary heating assembly are installed within multiple sets of second frames 12. The water supply assembly includes a water supply pipe 31, which is made of seamless stainless steel. One end of the water supply pipe 31 is connected to the outlet of the ultrafiltration unit 32, and the other end branches to form multiple outlets. The outlets of the multiple sets of water supply pipes 31 are respectively sealed to the water distribution ring pipes 56 of the multiple sets of evaporation components through multiple sets of quick-connect couplings, which facilitates maintenance and replacement, while ensuring no seawater leakage and achieving uniform seawater supply. Stainless steel valves and pressure gauges are installed on the water supply pipes 31. The valves are used to control the on / off of the main water supply pipe, and the pressure gauges are used to monitor the water pressure in the water supply pipes 31. When the water pressure is abnormal, it can be adjusted through the valves to avoid damage to the pipeline due to excessive water pressure or affecting the spraying effect due to excessive water pressure.

[0031] An ultrafiltration unit 32 and a sand filter 33 are connected in series at the water inlet end of the water supply pipe 31. The ultrafiltration unit 32 and the sand filter 33 are respectively set in the third frame 13 and the fourth frame 14. The sand filter 33 works in conjunction with the ultrafiltration unit 32 to pre-treat the seawater, remove impurities from the seawater, ensure that the seawater entering the evaporation component is clean and free of impurities, avoid clogging the pipes and evaporation pipe 54, and extend the service life of the equipment. The sand filter 33 has a quartz sand filter layer inside. The inlet of the sand filter 33 is connected to an external seawater supply pipeline through a pipe. A stainless steel water pump and valve are installed at the inlet to pressurize and deliver external seawater to the sand filter 33. The valve is used to control the amount of seawater entering the sand filter 33. The outlet of the sand filter 33 is connected to the inlet of the ultrafiltration unit 32 through a pipe. A sealing flange and gasket are installed at the connection to ensure no leakage. The bottom of the sand filter 33 has a drain port with a stainless steel valve installed. The valve can be opened periodically to discharge large particles and suspended solids generated during filtration, preventing the accumulation of impurities from affecting the filtration effect. At the same time, a pressure gauge is installed on the sand filter 33 to monitor the pressure difference between the inlet and outlet of the sand filter 33, which facilitates timely drainage or replacement of quartz sand by the user.

[0032] The ultrafilter 32 has a hollow fiber membrane inside, which can further filter fine impurities in seawater. The inlet of the ultrafilter 32 is connected to the outlet of the sand filter 33, and the outlet is connected to the inlet of the water supply pipe 31. The water supply pipe 31 is also connected to a backwash interface, which is connected to a backwash water pump through a pipeline. The ultrafilter 32 can be backwashed periodically to remove impurities attached to the membrane surface and restore the filtration efficiency of the ultrafilter 32. The top of the ultrafilter 32 is equipped with a drain port with a valve to discharge impurities generated during filtration. A pressure gauge is installed on the ultrafilter 32 to monitor the operating pressure of the ultrafilter 32 and ensure that the ultrafilter 32 is working properly.

[0033] like Figures 1 to 12As shown, the secondary heating assembly includes a first steam supply pipe 41, a heating pipe 42, and a second steam supply pipe 43, which are sequentially and sealed together. All three pipes are made of seamless stainless steel and are connected by flanges made of stainless steel. Sealing gaskets are installed at the connections to ensure no steam leakage. The first steam supply pipe 41 connects to the steam outlet of the steam guide pipe 55 of one set of evaporation components; one end of the first steam supply pipe 41 is sealed to the steam outlet of the steam guide pipe 55 via a flange, and is used to collect the secondary steam generated by this set of evaporation components. The second steam supply pipe 43 connects to the steam inlet of another set of evaporation components. The steam inlet of the evaporation components is located on the side wall of the evaporation shell 51 and communicates with the evaporation pipe 54. One end of the second steam supply pipe 43 is sealed to the steam inlet of the evaporation shell 51 via a flange, and is used to transport the heated secondary steam to this set of evaporation components, realizing the recycling of secondary steam.

[0034] Both the first steam supply pipe 41 and the second steam supply pipe 43 are equipped with fans 45. The fans 45 are fixed inside the steam supply pipes by brackets made of stainless steel. The outlets of the fans 45 face the direction of steam flow to drive the secondary steam to flow in the heating circuit, ensuring smooth circulation of the secondary steam and improving heat utilization efficiency. Stainless steel valves and temperature sensors are installed on both the first steam supply pipe 41 and the second steam supply pipe 43. The valves are used to control the steam flow and on / off, and the temperature sensors are used to monitor the temperature of the secondary steam and transmit the temperature signal to the controller, which then adjusts the heating intensity.

[0035] A spiral heat exchanger 44, made of stainless steel, is installed inside the heating tube 42. Both ends of the spiral heat exchanger 44 are connected to external heating medium supply pipes to heat the secondary steam through heat conduction, thereby increasing the secondary steam temperature and ensuring evaporation efficiency. The heating tube 42 is wrapped with a rock wool insulation layer, which is then covered with a waterproof cloth to reduce heat loss and ensure stable heating efficiency. Temperature sensors and pressure gauges are installed on the heating tube 42 to monitor the temperature and pressure inside, preventing damage to the equipment due to excessive temperature or pressure.

[0036] The secondary heating component is also connected to an external steam inlet pipe, which is made of seamless stainless steel. One end of the external steam inlet pipe is connected to the first steam supply pipe 41, and a flange and valve are installed at the connection. The valve is used to control the on / off of the external steam. The other end of the external steam inlet pipe is connected to an external steam supply device, which is used to introduce external steam into the heating pipe 42 at the beginning of the device startup to heat the evaporation component for the first time, solving the problem of heating without secondary steam at the beginning of the device startup. After the evaporation component generates enough secondary steam, the valve of the external steam inlet pipe is closed, and the device switches to the secondary steam circulation heating mode to reduce energy consumption and prevent secondary steam from flowing back to the external steam supply device, ensuring equipment safety.

[0037] like Figures 2 to 11 As shown, the condensing assembly includes a condensing shell 21, a flow divider 22, and a condenser 23. All parts are made of stainless steel and have been treated with anti-corrosion coating. A steam inlet is provided on one side of the condensing shell 21. The steam inlet is sealed to the steam outlet of the steam guide pipe 55 of the evaporating assembly through a flange. That is, the steam outlet of the steam guide pipe 55 passes through the side wall of the condensing shell 21 and is connected to the steam inlet flange of the condensing shell 21. A sealing ring is installed at the connection to ensure that there is no steam leakage. The bottom of the condensing shell 21 is provided with a condensate outlet and a salt spray outlet, which are connected to the first guide ring pipe 25 and the second guide ring pipe 26, respectively, to promptly discharge the condensate and salt water, ensuring that neither is stored in the condensing shell 21.

[0038] The condenser 23 is installed inside the condenser shell 21 and adopts a shell-and-tube structure. Cooling medium flows through the tubes of the condenser 23. Both the inlet and outlet of the condenser 23 are connected to an external cooling system through pipelines to form a cooling cycle for condensing steam. A spiral blade 24 is fitted on the outer side of the condenser 23. The spiral blade 24 is made of stainless steel with a polished surface. The spiral angle of the spiral blade 24 is set to 30° to guide the steam to form a swirling flow, prolonging the residence time of the steam in the condenser shell 21 and improving condensation efficiency. At the same time, centrifugal force separates the salt mist droplets in the steam, preventing the salt mist from mixing with the condensate and ensuring the purity of the fresh water. The separated condensate and brine are not stored in the condenser shell 21 but are promptly discharged through corresponding guide ring pipes.

[0039] The helical blade 24 is connected to a motor, which is mounted on top of the condenser housing 21. The motor housing has a waterproof and sealed structure, with a stainless steel protective shell on the outside to prevent corrosion from salt spray and moisture. The motor shaft passes through the top of the condenser housing 21 and is connected to the helical blade 24 via a coupling made of stainless steel to ensure a secure connection and stable power transmission. A waterproof sleeve made of fluororubber is fitted at the connection point of the motor shaft, providing excellent sealing performance and preventing moisture and salt spray from entering the motor, thus avoiding short circuit damage. Sealant is applied to the connections between the waterproof sleeve and the condenser housing 21, as well as the motor shaft, to further enhance the sealing effect.

[0040] The inner wall of the condenser shell 21 is also connected by clips to a guide plate for collecting salt spray. The guide plate is made of stainless steel with an anti-stick surface to reduce salt spray adhesion. The inner wall of the guide plate is inclined at 15° to facilitate the collection of salt spray droplets under gravity. The bottom of the guide plate is aligned with the salt spray outlet of the condenser shell 21 to ensure that the separated salt spray droplets can flow smoothly into the second guide ring pipe 26 and be promptly discharged to the external concentrated brine storage structure, instead of being stored inside the condenser shell 21. The clips are made of stainless steel and fixed to the inner wall of the condenser shell 21. The guide plate can be directly removed for cleaning without disassembling the condenser shell 21, which facilitates maintenance and prevents salt spray from accumulating on the guide plate, affecting the salt spray separation effect and condensation efficiency.

[0041] The condenser housing 21 is also equipped with a vacuum pump, which is fixed to the outside of the condenser housing 21 by a bracket made of stainless steel. The inlet of the vacuum pump is connected to the inside of the condenser housing 21 through a pipe, and the connection is sealed with a flange to ensure airtightness. The outlet of the vacuum pump is connected to an external waste gas treatment device through a pipe to discharge the extracted air and a small amount of non-condensable gases. The function of the vacuum pump is to create a negative pressure environment within the device. On the one hand, this accelerates the flow rate of steam, allowing it to quickly reach the surface of the condenser 23 and improve condensation efficiency; on the other hand, it lowers the boiling point of seawater, reducing heat loss and further improving the energy-saving effect of the device. The vacuum pump is equipped with a pressure gauge and a valve. The pressure gauge is used to monitor the operating pressure of the vacuum pump, and the valve is used to control the on / off state of the vacuum pump, facilitating the adjustment of the vacuum pump's operating mode according to the operating status of the device.

[0042] The diverter plate 22 is installed inside the condenser housing 21, below the condenser 23. Made of stainless steel, the diverter plate 22 is fixed to the inner wall of the condenser housing 21 by a stainless steel bracket. The diverter plate 22 collects condensate and salt spray droplets separately. Multiple sets of condensate collection holes and multiple sets of salt spray collection holes are provided on the diverter plate 22. The condensate collection holes are connected to the first guide ring pipe 25, and the salt spray collection holes are connected to the second guide ring pipe 26, ensuring that condensate and salt water can be discharged promptly through their respective guide ring pipes and are not stored within the condenser housing 21. The surface of the diverter plate 22 is polished to reduce the adhesion of condensate and salt spray, ensuring that condensate flows smoothly into the first guide ring pipe 25 and salt spray droplets flow smoothly into the second guide ring pipe 26, achieving separation of condensate and salt spray and improving the purity of the fresh water.

[0043] The bottom of the diverter plate 22 is sealed with a first guide ring pipe 25 and a second guide ring pipe 26. Both the first guide ring pipe 25 and the second guide ring pipe 26 are made of seamless stainless steel pipes. Both are flow guiding components that promptly discharge condensate and brine from the condenser shell 21, ensuring that neither is stored within the condenser shell 21. One end of the first guide ring pipe 25 is connected to an external freshwater storage structure, allowing condensate to be discharged to external storage. A water pump is installed on the first guide ring pipe 25 to pressurize and discharge the condensate collected by the diverter plate 22, ensuring timely discharge to the external storage structure. One end of the second guide ring pipe 26 extends to the outside of the device and connects to an external concentrated brine storage structure, allowing concentrated brine to be discharged to external storage. The second guide ring pipe 26 can discharge the concentrated brine formed by the convergence of salt mist, preventing salt mist droplets from accumulating and storing within the condenser shell 21, preventing equipment corrosion, and ensuring no liquid residue remains within the condenser shell 21.

[0044] like Figures 1 to 13 As shown, this device is controlled by a controller to achieve full-process operation. The external controller can be a PLC controller, model S7-200. The controller is installed in a control box, which is made of stainless steel and has a touch screen and operation buttons on its surface. The touch screen is used to display the device's operating status, parameter settings, and fault alarm information, while the operation buttons are used to manually control the start and stop of each device.

[0045] The controller connection is as follows: The controller's signal output terminals are connected to the water pumps and valves on the water supply pipe 31, sand filter 33, and ultrafilter 32, the fan 45 in the first steam supply pipe 41 and the second steam supply pipe 43, the spiral heat exchanger 44 in the heating pipe 42, the valves in the external steam access pipe, and the cooling water pump, vacuum pump, and motor of the condenser assembly. This enables the start / stop control and parameter adjustment of these devices. The controller's signal input terminals are connected to the pressure gauges on the water supply pipe 31, sand filter 33, and ultrafilter 32, the temperature sensors and pressure gauges on the first steam supply pipe 41, the second steam supply pipe 43, and the heating pipe 42, and the temperature and pressure sensors on the condenser shell 21. This allows the acquisition of the device's operating parameters, such as seawater pressure, pretreatment pressure, secondary steam temperature, heating pipe 42 temperature, and condenser shell 21 pressure. Valves can be uniformly adopted as 2W series solenoid valves, temperature sensors can be uniformly adopted as WRN series assembled thermocouples, pressure gauges can be uniformly adopted as YX-60, and pressure sensors can be uniformly adopted as MPM280 / 281 series.

[0046] The specific operating logic of the secondary steam heating circuit is that the device operates in a cyclical manner, and the specific process is as follows: During the initial startup of the device, external steam is introduced through an external steam inlet pipe. The external steam enters the heating tube 42 and heats it through the spiral heat exchanger 44. The heat is then transferred to the evaporation tube 54 of the first evaporation assembly, achieving the initial heating of the first evaporation assembly. Simultaneously, the water supply assembly sprays pretreated seawater onto the outer wall of the evaporation tube 54 of the first evaporation assembly through the water distribution ring pipe 56. The seawater evaporates under the heat of the evaporation tube 54, forming secondary steam. The secondary steam is then transported to the second evaporation assembly through steam holes to heat the evaporation tube 54 of the second evaporation assembly. In conjunction with the water distribution ring pipe 56 spraying seawater onto the second evaporation tube 54, the second set of seawater evaporates and generates new secondary steam. The vacuum pump operates continuously, extracting air from the condenser shell 21 and each evaporation assembly to create a negative pressure environment, lowering the boiling point of the seawater and improving the evaporation efficiency. Following this process, the secondary steam generated by the second group is continuously transported to the third group of evaporation components, and so on, repeating the heating, evaporation, and secondary steam export heating process until the xth group of evaporation components (users can increase water production by adding a first frame 11, evaporation components, a condensation component, a second frame 12, and a secondary heating component according to actual water production needs). The secondary steam generated by the last group of evaporation components is exported through the steam outlet and enters the secondary heating component for heating. After heating, it is transported through pipelines to the first group of evaporation components to heat the evaporation tubes 54 of the first group of evaporation components, forming a complete secondary steam circulation loop. During the entire circulation process, the steam that has completed heat exchange in each evaporation tube 54 will enter the corresponding condensation component for condensation. The condensate and separated brine generated by condensation are promptly exported to the external storage structure through the corresponding guide ring pipes, and are not stored in the condensation shell 21. At the same time, a negative pressure environment is maintained to ensure circulation operation and reduce overall energy consumption.

[0047] The working process of this device is as follows: First, the user sets the device's operating parameters, such as seawater supply, secondary steam temperature, negative pressure value of condenser shell 21, and heating medium temperature, through the controller's touchscreen. Then, the device is started. External seawater is transported to the sand filter 33 by the water pump at the inlet end of the sand filter 33. After passing through the quartz sand filter layer of the sand filter 33, large particles and suspended solids in the seawater are removed. The filtered seawater enters the ultrafilter 32 and passes through the hollow fiber membrane of the ultrafilter 32 to further filter fine impurities, completing the seawater pretreatment. The pretreated seawater is transported to the water supply pipe 31 by the water pump, and enters the water distribution ring pipe 56 of each evaporation component through multiple quick-connect couplings. The water distribution ring pipe 56 sprays seawater evenly onto the outer wall of the evaporation pipe 54 through spray holes, forming a uniform water film.

[0048] Simultaneously, the controller activates the vacuum pump to extract air from the condenser shell 21 and each evaporation component, creating a negative pressure environment to lower the boiling point of seawater and accelerate its evaporation. The system then enters the secondary steam heating loop to produce freshwater. During operation, the controller monitors the operating parameters of each device and adjusts their status, such as the seawater spray volume of each water distribution ring pipe 56, the heating intensity of the secondary heating components, and the operating power of the vacuum pump, ensuring stable operation. Users can view the device's operating status via the touchscreen and manually adjust operating parameters or perform manual operations as needed. Condensate and concentrated brine are discharged through the first guide ring pipe 25 and the second guide ring pipe 26, ensuring both are promptly discharged to an external storage structure and not stored within the condenser shell 21 to prevent liquid accumulation and equipment corrosion. If further increases in water production are required, additional components can be added. These new components can be directly connected to the existing circulation loop without significant modifications to the original device, adapting to different water production needs and achieving the advantages of modular expansion.

[0049] After the device has been running for a period of time, the sand filter 33 and ultrafilter 32 can be periodically drained and backwashed to remove impurities generated during filtration and restore filtration efficiency. The guide plate inside the condenser shell 21 can be removed and cleaned to remove salt spray impurities adhering to the surface. The sealing condition of each pipeline and flange can be checked, and damaged gaskets and rubber rings can be replaced in time to prevent leakage. The operation of each water pump, fan 45, motor, and vacuum pump can be checked, and timely maintenance and upkeep can be performed to extend the service life of the equipment. When the device needs to be transported or relocated, each frame and component can be disassembled for easy transportation and reinstallation, adapting to different usage scenarios and meeting the drinking water supply needs of different areas such as coastal areas and islands.

[0050] In summary, this device utilizes a modular frame to enable detachable connections of its components, facilitating transportation, installation, maintenance, and expansion. By installing spiral blades 24 on the condenser 23 and connecting them to a motor, steam is guided to form a swirling flow, improving condensation efficiency and salt mist separation. The use of a flow divider 22 and a guide plate achieves separation of condensate and salt mist. The inclusion of a secondary heating component and an external steam inlet pipeline enables secondary steam recycling and rapid device startup, reducing energy consumption. The ultrafiltration unit 32 and sand filter 33 pre-treat seawater, preventing impurities from clogging pipelines and equipment. A controller enables full-process control, enhancing the stability and convenience of device operation. Liquid level monitoring and automatic discharge control ensure that condensate and brine are not stored within the condenser shell 21. Insulation panels cover each frame, reducing heat loss and ensuring stable device operation.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A modularly assembled seawater desalination device, characterized in that: The system includes a desalination component, a water supply component, and a secondary heating component, which together form a secondary steam heating circuit. The secondary heating component is also connected to an external steam inlet pipe for initial heating of the evaporation component. The desalination component includes multiple sets of first frames (11), each set of first frames (11) is equipped with an evaporation component, and each set of evaporation components is connected to a condensation component via a pipe. The condensation component includes a condensation shell (21), a flow divider (22), and a condenser (23). The condenser (23) is fitted with spiral blades (24), which are used to guide steam to form a swirling flow. The flow divider (22) is used to collect condensate and salt spray droplets respectively. The secondary heating component is linked with the evaporation component, and the water supply component is used to supply pretreated seawater to the evaporation component.

2. The modularly assembled seawater desalination device according to claim 1, characterized in that: The desalination component is provided with multiple sets of second frames (12) at one end, and a third frame (13) and a fourth frame (14) are provided on one side of the desalination component respectively. The multiple sets of second frames (12), the third frame (13) and the fourth frame (14) are detachably connected to the multiple sets of first frames (11) by multiple sets of bolts.

3. A modularly assembled seawater desalination device according to claim 2, characterized in that: The water supply component and the secondary heating component are both installed in multiple sets of the second frame (12). The water supply component includes a water supply pipe (31). The water supply pipe (31) is provided with multiple sets of water outlets. The multiple sets of water supply pipe (31) outlets are respectively sealed and connected to multiple sets of evaporation components through multiple sets of quick-connect fittings for uniformly supplying seawater.

4. A modularly assembled seawater desalination device according to claim 3, characterized in that: The water supply pipe (31) has an ultrafilter (32) and a sand filter (33) connected in series at the water inlet end. The ultrafilter (32) and the sand filter (33) are respectively installed in the third frame (13) and the fourth frame (14). The sand filter (33) works in conjunction with the ultrafilter (32) to pretreat seawater.

5. A modularly assembled seawater desalination device according to claim 1, characterized in that: The secondary heating assembly includes a first steam supply pipe (41), a heating pipe (42), and a second steam supply pipe (43) that are sequentially sealed and connected. The first steam supply pipe (41) is connected to the steam outlet of one of the evaporation assemblies, and the second steam supply pipe (43) is connected to the steam inlet of the other evaporation assembly.

6. A modularly assembled seawater desalination device according to claim 5, characterized in that: Both the first steam pipe (41) and the second steam pipe (43) are equipped with a fan (45), which is used to drive the secondary steam to flow in the heating circuit. The heating pipe (42) is equipped with a spiral heat exchanger (44), which is used to heat the secondary steam.

7. A modularly assembled seawater desalination device according to claim 1, characterized in that: Multiple evaporation components are connected by flanges. The evaporation components include an evaporation shell (51). A first sealing plate (52) and a second sealing plate (53) are fixed inside the evaporation shell (51). The second sealing plate (53) has a steam hole for discharging secondary steam. Multiple sets of evenly distributed evaporation tubes (54) are inserted between the first sealing plate (52) and the second sealing plate (53).

8. A modularly assembled seawater desalination device according to claim 7, characterized in that: A steam guide pipe (55) is installed at the end of the second sealing plate (53) away from the first sealing plate (52). The steam inlet end of the steam guide pipe (55) covers multiple sets of evaporation tubes (54), and the steam outlet end of the steam guide pipe (55) passes through the side wall of the evaporation shell (51) and is sealed to the condensation assembly. The steam guide pipe (55) is used to introduce the steam in the evaporation tubes (54) into the condensation assembly.

9. A modularly assembled seawater desalination device according to claim 8, characterized in that: A water distribution ring pipe (56) is also installed between the first sealing plate (52) and the second sealing plate (53) by screws. The water inlet end of the water distribution ring pipe (56) passes through the evaporation shell (51) and is sealed to the water supply assembly. The water distribution ring pipe (56) is sleeved on the outside of multiple sets of evaporation pipes (54) and is evenly arranged around the multiple sets of evaporation pipes (54). The water distribution ring pipe (56) is used to evenly spray pretreated seawater onto the outer wall of the multiple sets of evaporation pipes (54).

10. A modularly assembled seawater desalination device according to claim 1, characterized in that: The bottom of the diversion plate (22) is connected to a first guide ring pipe (25) and a second guide ring pipe (26). The first guide ring pipe (25) is used to connect to an external fresh water storage tank, and the second guide ring pipe (26) is used to connect to an external concentrated brine discharge tank. In the secondary steam heating circuit, the secondary steam generated by the evaporation component is heated by the secondary heating component and then flows back to the evaporation component to realize the recycling of secondary steam.

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