A small seawater desalination plant

Abstract

The utility model relates to a kind of small seawater desalination equipment, including evaporative condenser, gas-liquid separation tank, waste liquid pump, fresh water pump, vacuum pump and electric cabinet, evaporative condenser includes shell, condenser and evaporator, evaporative condenser includes pressure sensor, first temperature sensor, condensing end cold side import, condensing end cold side export, cold end end hot side export, evaporating end hot side import, evaporating end hot side export, evaporating end cold side import and waste liquid port.Evaporative condenser's cold end end hot side export is connected with gas-liquid separation tank, gas-liquid separation tank outlet connects fresh water pump, and fresh water pump discharges fresh water.Electric cabinet is connected with pressure sensor, first temperature sensor, second temperature sensor, vacuum pump, waste liquid pump and fresh water pump, and the whole equipment is controlled.The application uses evaporative condenser and three medium heat exchanger, compact structure, overall design is reasonable, only small arrangement space can be realized in automatic operation under the utilization of seawater manufacturing fresh water.

Description

Technical Field

[0001] This utility model relates to the field of seawater desalination equipment, specifically a small-scale seawater desalination device. Background Technology

[0002] Although the Earth's surface contains abundant water resources, freshwater resources constitute a very small proportion and are extremely unevenly distributed. Many regions, especially coastal islands, remote areas, and some offshore operating platforms, face severe freshwater shortages. This makes obtaining a reliable freshwater supply a key constraint on development in these regions.

[0003] In maritime environments such as ships and offshore oil platforms, space is limited, yet the demand for fresh water is significant. Traditional large-scale seawater desalination equipment is bulky and heavy, making it unsuitable for these locations. For example, the device described in Patent No. 201110368438.1, entitled "A Device Using Dual-Heat Source Spray Evaporation Seawater Desalination Technology," necessitates the development of miniaturized seawater desalination equipment with high waste heat utilization rates to meet the freshwater needs of offshore operations. Furthermore, infrastructure in remote areas and islands is relatively weak, with limitations in power supply and transportation. Small-scale seawater desalination equipment offers advantages such as small size, light weight, and ease of transportation and installation, making it adaptable to the unique environments of these regions and providing a reliable freshwater supply to local residents. Utility Model Content

[0004] The purpose of this invention is to provide a small-scale seawater desalination device. This device has a compact structure, occupies little space, and has a high waste heat utilization rate. It can be used in places such as long-distance ships, offshore operation platforms, and remote islands to provide essential domestic water for a small number of residents or staff.

[0005] The technical solution of this utility model:

[0006] A small-scale seawater desalination device includes an evaporator-condenser, a gas-liquid separator, a heat exchanger, a waste liquid pump, a freshwater pump, a vacuum pump, and an electrical control cabinet. The evaporator-condenser comprises a fixed plate, a condenser, an evaporator, and a rear outer shell. The fixed plate and the rear outer shell are detachably connected, and a sealing gasket is provided between them. The condenser is housed in the upper part of the cavity formed between the fixed plate and the rear outer shell, and the evaporator is housed in the lower part. The evaporator-condenser includes a cold-side inlet, a cold-side outlet, and a hot-side outlet on the condenser end. The evaporator has a hot-side inlet, a hot-side outlet, and a cold-side inlet on the evaporator end, as well as a waste liquid outlet. A first liquid level sensor and a pressure sensor are installed on the evaporator-condenser. The seawater inlet pipe is connected to the inlet of the cold source medium channel of the heat exchanger, and the outlet of the cold source medium channel is connected to the cold-side inlet of the evaporator-condenser via a pipeline. The side outlet is connected to the cold side inlet of the evaporator end via a pipeline, and the hot side outlet of the condenser end is connected to the liquid inlet of the gas-liquid separator via a pipeline. The hot side inlet of the evaporator end is the steam inlet of the equipment, and the hot side outlet of the evaporator end is the steam outlet of the equipment. The liquid outlet of the gas-liquid separator is connected to the inlet of the fresh water pump via a pipeline. The outlet of the fresh water pump is connected to the inlet of the first heat source medium channel of the heat exchanger via a pipeline. The outlet of the first heat source medium channel is connected to the domestic water pipeline. The waste liquid outlet is connected to the inlet of the waste liquid pump via a pipeline. The outlet of the waste liquid pump is connected to the inlet of the second heat source medium channel of the heat exchanger via a pipeline. The outlet of the second heat source medium channel is connected to the waste liquid pipe. The gas outlet of the gas-liquid separator is connected to the vacuum pump. A second liquid level sensor is installed on the gas-liquid separator. The electrical control cabinet is connected to the pressure sensor, the first liquid level sensor, and the second liquid level sensor via signal cables, and to the waste liquid pump, the fresh water pump, and the vacuum pump via control cables.

[0007] The beneficial effects of this utility model are:

[0008] 1. The equipment in this application adopts an evaporative condenser and a three-medium heat exchanger. Moreover, the equipment investment is small, the structure is simple and compact, the overall layout design is more reasonable, and the production of fresh water from seawater can be achieved under automatic operation with a small layout space.

[0009] 2. The evaporator and condenser of the equipment in this application combine the condenser and evaporator into one unit, which reduces the footprint and is more conducive to the seawater desalination process. The heat exchanger used in this application is a three-medium heat exchanger, which also reduces the footprint and allows for better utilization of the residual heat from the waste liquid discharged from the waste liquid outlet and the liquid discharged from the gas-liquid separator to reheat the seawater, resulting in better heat utilization.

[0010] 3. The equipment described in this application significantly reduces energy consumption during the water production process by fully utilizing condensate and waste heat. It is a more efficient, lower-cost, and more energy-saving modern piece of equipment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the process flow of the small-scale seawater desalination equipment in this application.

[0012] Figure 2 This is a schematic diagram of the overall structure of the small-scale seawater desalination equipment of this application.

[0013] Figure 3 This is a schematic diagram of the overall structure of the small-scale seawater desalination equipment of this application from another angle.

[0014] Figure 4 This is a schematic diagram of the internal structure of the evaporator and condenser of the small-scale seawater desalination equipment of this application.

[0015] Figure 5 This is a schematic diagram of the evaporator plate bundle or condenser plate bundle structure of the evaporator condenser of the small-scale seawater desalination equipment of this application.

[0016] Figure 6 This is a schematic diagram of the first sealing gasket structure of the evaporator condenser in the small-scale seawater desalination equipment of this application.

[0017] Figure 7 This is a schematic diagram of the second sealing gasket structure of the evaporator condenser in the small-scale seawater desalination equipment of this application.

[0018] Figure label:

[0019] 1. Evaporator / Condenser; 2. Gas-Liquid Separator; 3. Heat Exchanger; 4. Waste Liquid Pump; 5. Fresh Water Pump; 6. Vacuum Pump; 7. Electrical Control Cabinet; 8. Seawater Inlet Pipe; 9. Domestic Water Pipeline; 10. Waste Liquid Pipe; 11. Fixing Plate; 12. Condenser; 13. Evaporator; 14. Rear Outer Shell; 15. Waste Liquid Outlet; 16. First Liquid Level Sensor; 17. Pressure Sensor; 18. Crossbeam; 21. Second Liquid Level Sensor; 31. Cold Source Medium Channel Inlet; 32. Cold Source Medium Channel Outlet; 33. First Heat Source Medium Channel Inlet; 34. First Heat Source Medium Channel Outlet; 35. Second Heat Source Medium Channel Inlet. 5; Second heat source medium channel outlet 36; Cold side inlet of condensing end 121; Cold side outlet of condensing end 122; Hot side outlet of condensing end 123; Condenser plate bundle 124; Condenser movable plate 125; Clamping bolt 126; Hot side inlet of evaporating end 131; Hot side outlet of evaporating end 132; Cold side inlet of evaporating end 133; Evaporator plate bundle 134; Evaporator movable plate 135; Heat exchange plate 1241; First sealing gasket 1242; Second sealing gasket 1243; First sealing gasket 1244; Second sealing gasket 1245; Opening 1246. Detailed Implementation

[0020] In situations where infrastructure is relatively weak, such as on ships at sea, offshore oil platforms, remote areas, and islands, there is a need to address the problem of providing essential drinking water to a small number of residents or workers in locations where power supply and transportation conditions are limited. This invention relates to a small-scale seawater desalination device, which features a simple and compact design, requiring only a small footprint to automatically produce fresh water from seawater.

[0021] It should be noted that in the description of this utility model, the terms "upper", "lower", "inner", "outer", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Figures 1-3 As shown, a small-scale seawater desalination device includes an evaporator-condenser 1, a gas-liquid separator 2, a heat exchanger 3, a waste liquid pump 4, a freshwater pump 5, a vacuum pump 6, and an electrical control cabinet 7. The evaporator-condenser 1 includes a fixed plate 11, a condenser 12, an evaporator 13, and a rear outer shell 14. The fixed plate 11 and the rear outer shell 14 are detachably connected. A sealing gasket is provided between the fixed plate and the rear outer shell. The condenser 12 is arranged in the upper part of the cavity formed between the fixed plate 11 and the rear outer shell 14, and the evaporator 13 is arranged in the lower part.

[0024] The evaporator-condenser 1 includes a condenser end cold-side inlet 121, a condenser end cold-side outlet 122, and a condenser end hot-side outlet 123; the evaporator end hot-side inlet 131, evaporator end hot-side outlet 132, and evaporator end cold-side inlet 133; and a waste liquid outlet 15.

[0025] A first liquid level sensor 16 and a pressure sensor 17 are installed on the evaporator-condenser 1.

[0026] The seawater inlet pipe 8 is connected to the cold source medium channel inlet 31 of the heat exchanger 3, the cold source medium channel outlet 32 ​​is connected to the condenser end cold side inlet 121 of the evaporator-condenser 1 through a pipe, and the condenser end cold side outlet 122 is connected to the evaporator end cold side inlet 133 through a pipe.

[0027] The condenser end hot side outlet 123 is connected to the liquid inlet of the gas-liquid separator 2 via a pipeline.

[0028] The evaporator end hot side inlet 131 is the equipment's steam inlet, and the evaporator end hot side outlet 132 is the equipment's steam outlet.

[0029] The outlet of the gas-liquid separator 2 is connected to the inlet of the fresh water pump 5 through a pipeline. The outlet of the fresh water pump 5 is connected to the inlet 33 of the first heat source medium channel of the heat exchanger 3 through a pipeline. The outlet 34 of the first heat source medium channel is connected to the domestic water pipeline 9. The waste liquid outlet 15 is connected to the inlet of the waste liquid pump 4 through a pipeline. The outlet of the waste liquid pump 4 is connected to the inlet 35 of the second heat source medium channel of the heat exchanger 3 through a pipeline. The outlet 36 of the second heat source medium channel is connected to the waste liquid pipe 10. The gas outlet of the gas-liquid separator 2 is connected to the vacuum pump 6. A second liquid level sensor 21 is installed on the gas-liquid separator 2.

[0030] The electrical control cabinet 7 is connected to the pressure sensor, the first liquid level sensor, and the second liquid level sensor via signal cables, and to the waste liquid pump, the fresh water pump, and the vacuum pump via control cables.

[0031] Figure 4 As shown, the condenser 12 of the evaporator-condenser 1 includes a condenser plate bundle 124 and a condenser movable plate 125. A clamping bolt 126 passes through the threaded hole on the condenser movable plate 125 and the threaded blind hole on the fixed plate 11 to clamp the condenser plate bundle 124, the condenser movable plate 125 and the fixed plate 11. The evaporator of the evaporator-condenser 1 includes an evaporator plate bundle 134 and an evaporator movable plate 135. A clamping bolt 126 passes through the threaded hole on the evaporator movable plate 135 and the threaded blind hole on the fixed plate 11 to clamp the evaporator plate bundle 134, the evaporator movable plate 135 and the fixed plate 11. Positioning grooves are opened on both sides of the condenser movable plate 125 and the evaporator movable plate 135. A crossbeam 18 passes through the positioning groove and is bolted to the fixed plate. The crossbeam 18 is used for positioning and provides support. The fixed plate of the evaporator-condenser 1 has a condenser end cold side inlet pipe, a condenser end cold side outlet pipe, a condenser end hot side outlet pipe, an evaporator end hot side inlet pipe, an evaporator end hot side outlet pipe, and an evaporator end cold side inlet pipe, which are respectively connected to the condenser end cold side inlet, condenser end cold side outlet, condenser end hot side outlet, evaporator end hot side inlet, evaporator end hot side outlet, and evaporator end cold side inlet inside the evaporator-condenser 1. The equipment of this application performs evaporation and condensation operations on seawater through the evaporator-condenser 1, and then separates the gas in a gas-liquid separator to obtain fresh water. The evaporator and condenser of this application are integrated together using a single fixed plate, resulting in a compact structure and small footprint.

[0032] like Figures 5-7As shown, the condenser plate bundle 124 and evaporator plate bundle 134 of the evaporator condenser 1 have the same structure, including multiple heat exchange plates 1241, multiple first sealing gaskets 1242, and multiple second sealing gaskets 1243. The heat exchange plates are commonly used plate heat exchanger plates in the prior art. The first sealing gaskets 1242 and second sealing gaskets 1243 are alternately placed between the heat exchange plates 1241. The first sealing gasket 1242 is a rectangular single sealing gasket 1244, with a corner hole double sealing gasket 1245 in one diagonal of the single sealing gasket 1244. The second sealing gasket 1243 is a rectangular single sealing gasket 1244, with a corner hole double sealing gasket 1245 in one diagonal of the single sealing gasket 1244. The corner hole double sealing gaskets of the first sealing gasket 1242 and the corner hole double sealing gaskets of the second sealing gasket do not coincide. The long side of the single sealing gasket has an opening 1246 in the middle. The first sealing gasket 1242 has a continuous and complete sealing gasket, and the channel it occupies is sealed. The second sealing gasket 1243 has an opening 1246 on its upper side, making the channel of the gasket open to the outside. The opening on the upper side of the second sealing gasket allows the steam and waste liquid formed after heat exchange of the cold medium entering from the cold side inlet of the evaporator condenser to flow out through the upper opening. The waste liquid flows downwards after flowing out of the upper opening and is discharged from the waste liquid outlet by the action of a waste liquid pump. The steam rises through the opening on the upper side of the second sealing gasket of the condenser plate bundle of the evaporator condenser and enters the condenser. After entering the condenser, it exchanges heat with the seawater entering the condenser to form condensate. The condensate flows into the gas-liquid separator through a pipeline.

[0033] The heat exchanger in this application utilizes the residual heat from the waste liquid discharged from the evaporator-condenser 1 and the condensate flowing from the outlet of the gas-liquid separator. The heat exchanger can be two heat exchangers connected in series, one with a cold source medium and the other with a heat source medium. However, for a compact structure, a three-medium heat exchanger is preferred, i.e., a heat exchanger that exchanges heat between two heat source media and one cold source medium. The three-medium heat exchanger can be based on the invention described in application number 202411924396.9: "A Plate and Plate Heat Exchanger Device for Dual-Medium and Single-Medium Heat Exchange".

[0034] When using a three-medium heat exchanger: such as Figures 1-3As shown, the heat exchanger 3 in the device of this application is a three-medium heat exchanger. The three-medium heat exchanger includes a fixed plate, a movable plate, and a plate bundle. Clamping bolts clamp the fixed plate, the movable plate, and the plate bundle. The plate bundle includes a first heat source medium channel, a second heat source medium channel, and a cold source medium channel. The hot medium in the first heat source medium channel and the second heat source medium channel exchange heat with the cold medium in the cold source medium channel. The seawater inlet pipe is connected to the inlet of the cold source medium channel of the three-medium heat exchanger. The outlet of the cold source medium channel is connected to the cold side inlet of the condenser end of the evaporator condenser through a pipeline. The outlet of the freshwater pump connected to the gas-liquid separator is connected to the inlet of the first heat source medium channel of the three-medium heat exchanger through a pipeline. The outlet of the first heat source medium channel is connected to the domestic water pipeline. The outlet of the waste liquid pump connected to the waste liquid outlet of the evaporator condenser is connected to the inlet of the second heat source medium channel of the three-medium heat exchanger through a pipeline. The outlet of the second heat source medium channel is connected to the waste liquid pipe.

[0035] When two heat exchangers are connected in series: the heat exchangers include a first heat exchanger and a second heat exchanger. The seawater inlet pipe is connected to the inlet of the cold source medium channel of the first heat exchanger. The outlet of the cold source medium channel of the first heat exchanger is connected to the inlet of the cold source medium channel of the second heat exchanger through a pipeline. The outlet of the cold source medium channel of the second heat exchanger is connected to the cold side inlet of the condenser end of the evaporator-condenser through a pipeline. The outlet of the freshwater pump connected to the gas-liquid separator is connected to the inlet of the heat source medium channel of the first heat exchanger through a pipeline. The outlet of the heat source medium channel of the first heat exchanger is connected to the domestic water pipeline. The outlet of the waste liquid pump connected to the waste liquid outlet of the evaporator-condenser is connected to the inlet of the heat source medium channel of the second heat exchanger through a pipeline. The outlet of the heat source medium channel of the second heat exchanger is connected to the waste liquid pipe.

[0036] A specific embodiment of a small-scale seawater desalination device described in this application is as follows: Figure 1 , 2 As shown:

[0037] This application discloses a small-scale seawater desalination equipment, comprising an evaporator-condenser 1, a gas-liquid separator 2, a waste liquid pump 4, a freshwater pump 5, a vacuum pump 6, a heat exchanger 3, a seawater inlet pipe 8, a domestic water pipeline, and an electrical control cabinet 7. The equipment includes an evaporator-condenser 1 that integrates the evaporator and condenser into one unit, resulting in a small footprint. The evaporator-condenser is equipped with a pressure sensor, a first liquid level sensor, a hot-side inlet at the evaporation end, a hot-side outlet at the evaporation end, a cold-side inlet at the evaporation end, a cold-side inlet at the condensation end, a hot-side outlet at the condensation end, a cold-side outlet at the condensation end, and a waste liquid outlet.

[0038] The hot-side inlet of the evaporator-condenser also serves as the equipment's steam inlet, and the hot-side outlet of the evaporator-condenser also serves as the equipment's steam outlet. The cold-side outlet of the condenser-condenser is connected to the cold-side inlet of the evaporator-condenser via a pipeline. The cold-side inlet of the condenser-condenser is connected to the outlet of the cold source medium channel of the three-medium heat exchanger via a pipeline. The waste liquid outlet of the evaporator-condenser is connected to the inlet of the waste liquid pump via a pipeline. The outlet of the waste liquid pump is connected to the second heat source medium channel of the three-medium heat exchanger via a pipeline. The hot-side outlet of the condenser-condenser is connected to the inlet of the gas-liquid separator via a pipeline.

[0039] The three-medium heat exchanger includes a first heat source medium channel, a second heat source medium channel, and a cold source medium channel. The hot media in the first and second heat source medium channels exchange heat with the cold media in the cold source medium channel. The inlet of the cold source medium channel also serves as the equipment's seawater inlet. The outlet of the first heat source medium channel of the three-medium heat exchanger also serves as the equipment's condensate (domestic water) outlet, and the outlet of the second heat source medium channel also serves as the equipment's waste liquid outlet.

[0040] The equipment includes a gas-liquid separator, which is equipped with a second liquid level sensor, a liquid inlet, a gas outlet, and a liquid outlet. The gas outlet of the gas-liquid separator is connected to a vacuum pump via a pipeline, and the liquid outlet of the gas-liquid separator is connected to the inlet of a freshwater pump via a pipeline. The outlet of the freshwater pump is connected to the inlet of the first heat source of a three-medium heat exchanger via a pipeline.

[0041] The equipment includes an electrical control cabinet, which is connected to a pressure sensor, a first liquid level sensor, and a second liquid level sensor via signal cables, and to a waste liquid pump, a fresh water pump, and a vacuum pump via control cables. The pressure sensor, the first liquid level sensor, and the second liquid level sensor transmit the detected signals to the electrical control cabinet, which then controls the operation of the waste liquid pump, the fresh water pump, and the vacuum pump.

[0042] The working process of the small-scale seawater desalination equipment in this application:

[0043] Pipeline connection: Connect the hot side inlet and hot side outlet of the evaporator end of the equipment to the steam supply and return pipelines of the external pipeline, respectively. Connect the seawater inlet pipe of the equipment to the seawater supply pipeline of the external pipeline. Connect the outlet of the first heat source medium channel of the heat exchanger to the domestic water pipe. Connect the waste liquid pipe of the equipment to the sewage pipe of the external pipeline or discharge it directly.

[0044] Seawater preheating: When the equipment is running, seawater enters the inlet of the cold source medium channel of the three-medium heat exchanger through the seawater inlet pipe. During the process of flowing through the cold source medium channel of the three-medium heat exchanger, it exchanges heat with the first heat source condensate and the second heat source waste liquid on the hot side of the three-medium heat exchanger, and uses the residual heat of the waste liquid and condensate to preheat the seawater.

[0045] Secondary heating of seawater: After the seawater flows out of the cold source medium channel of the three-medium heat exchanger, it enters the cold side of the evaporator condenser through the cold side inlet of the evaporator condenser. During the process of flowing through the cold side of the evaporator condenser, it exchanges heat with the steam on the hot side of the evaporator condenser and uses the heat released during the condensation of the steam to heat the seawater a second time.

[0046] Seawater is heated three times: after flowing out of the cold side of the condenser end of the evaporator condenser, the seawater enters the evaporator end of the evaporator condenser through the inlet on the cold side of the evaporator end of the evaporator condenser. During the process of flowing through the cold side of the evaporator end of the evaporator condenser, it exchanges heat with the saturated steam on the hot side of the evaporator end of the evaporator condenser.

[0047] Waste liquid recovery and waste heat utilization in seawater: During the three-stage heating process of seawater, the waste liquid after seawater evaporation flows from the opening on the second sealing gasket to the lower part of the evaporator-condenser. It is then pumped out of the evaporator-condenser by the waste liquid pump through the waste liquid port. After being pumped out, the waste liquid enters the second heat source medium channel of the three-medium heat exchanger through the inlet. During the flow of the waste liquid through the second heat source medium channel of the three-medium heat exchanger, it exchanges heat with the seawater on the cold side of the three-medium heat exchanger, recovering the waste heat in the waste liquid to preheat the seawater. Subsequently, the waste liquid is directly discharged or flows into the external network waste liquid pipe.

[0048] Seawater condensation: The steam evaporated from the seawater exits through the opening on the upper part of the second sealing gasket, rises to the top of the evaporator and enters the hot side of the condenser end. As the steam flows through the hot side of the evaporator end, it exchanges heat with the seawater on the cold side. During the condensation process, the steam heats the seawater on the cold side of the evaporator end. The condensate then flows out of the hot side of the evaporator end and into the gas-liquid separator.

[0049] Seawater condensation recovery and waste heat utilization: After being pumped out of the gas-liquid separator by the freshwater pump, the condensate enters the first heat source medium channel of the three-medium heat exchanger through the inlet of the first heat source medium channel. During the process of the condensate flowing through the first heat source medium channel of the three-medium heat exchanger, it exchanges heat with the seawater on the cold side of the three-medium heat exchanger, recovering the waste heat in the condensate to preheat the seawater. Then the cold condensate flows into the freshwater pipeline network.

[0050] The equipment control process: The equipment electrical control cabinet controls the start and stop of the waste liquid pump and its operating frequency based on the signal from the first liquid level sensor, ensuring that the waste liquid level in the evaporator-condenser is not higher than the hot side outlet of the steam end of the evaporator and not lower than the minimum safe value. The electrical control cabinet also controls the start and stop of the fresh water pump and the vacuum pump and their operating frequencies based on the signals from the pressure transmitter and the second liquid level sensor, ensuring that the condensate level in the gas-liquid separator is not higher than the maximum safe value and not lower than the minimum safe value. At the same time, a negative pressure environment is created inside the equipment to reduce the temperature at which steam is generated and condensed in the evaporator-condenser, thereby reducing the heat consumption of the external heat source.

[0051] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art, inspired by this description, design similar structures and implementations to the above embodiments without departing from the technical essence of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A small-scale seawater desalination device, characterized in that: The system includes an evaporator-condenser, a gas-liquid separator, a heat exchanger, a waste liquid pump, a fresh water pump, a vacuum pump, and an electrical control cabinet. The evaporator-condenser comprises a fixed plate, a condenser, an evaporator, and a rear outer shell. The fixed plate and the rear outer shell are detachably connected, and a sealing gasket is provided between them. The condenser is housed in the upper part of the cavity formed between the fixed plate and the rear outer shell, and the evaporator is housed in the lower part. The evaporator-condenser includes a cold-side inlet, a cold-side outlet, and a hot-side outlet on the condenser end; and a hot-side inlet, a hot-side outlet, and a cold-side inlet on the evaporator end, as well as a waste liquid outlet. A first liquid level sensor and a pressure sensor are installed on the evaporator-condenser. A seawater inlet pipe is connected to the inlet of the cold source medium channel of the heat exchanger. The outlet of the cold source medium channel is connected to the cold-side inlet of the evaporator-condenser via a pipeline, and the cold-side outlet is connected via a pipeline. The system is connected to the cold-side inlet of the evaporator and the hot-side outlet of the condenser via a pipeline to the inlet of the gas-liquid separator. The hot-side inlet of the evaporator is the steam inlet of the equipment, and the hot-side outlet of the evaporator is the steam outlet of the equipment. The outlet of the gas-liquid separator is connected to the inlet of the freshwater pump via a pipeline. The outlet of the freshwater pump is connected to the inlet of the first heat source medium channel of the heat exchanger via a pipeline. The outlet of the first heat source medium channel is connected to the domestic water pipeline. The waste liquid outlet is connected to the inlet of the waste liquid pump via a pipeline. The outlet of the waste liquid pump is connected to the inlet of the second heat source medium channel of the heat exchanger via a pipeline. The outlet of the second heat source medium channel is connected to the waste liquid pipe. The gas outlet of the gas-liquid separator is connected to the vacuum pump. A second liquid level sensor is installed on the gas-liquid separator. The electrical control cabinet is connected to the pressure sensor, the first liquid level sensor, and the second liquid level sensor via signal cables, and to the waste liquid pump, the freshwater pump, and the vacuum pump via control cables.

2. The small-scale seawater desalination equipment according to claim 1, characterized in that: The condenser of the evaporator-condenser includes a condenser plate bundle and a condenser movable plate. Clamping bolts pass through threaded holes on the condenser movable plate and threaded blind holes on the fixed plate to clamp the condenser plate bundle, the condenser movable plate, and the fixed plate. The evaporator of the evaporator-condenser includes an evaporator plate bundle and an evaporator movable plate. Clamping bolts pass through threaded holes on the evaporator movable plate and threaded blind holes on the fixed plate to clamp the evaporator plate bundle, the evaporator movable plate, and the fixed plate. Positioning grooves are opened on both sides of the condenser movable plate and the evaporator movable plate. A crossbeam passes through the positioning grooves and is bolted to the fixed plate.

3. A small-scale seawater desalination device according to claim 2, characterized in that: The condenser plate bundle and evaporator plate bundle of the evaporator condenser have the same structure, including multiple heat exchange plates, multiple first sealing gaskets, and multiple second sealing gaskets. The first sealing gaskets and second sealing gaskets are alternately placed between the heat exchange plates. The first sealing gasket is a rectangular single sealing gasket with a corner hole double sealing gasket in one diagonal. The second sealing gasket is a rectangular single sealing gasket with a corner hole double sealing gasket in one diagonal. The corner hole double sealing gaskets of the first sealing gasket and the corner hole double sealing gaskets of the second sealing gasket do not coincide. The long side of the single sealing gasket has an opening in the middle.

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