A salt-containing liquid concentration device

Abstract

The utility model discloses a kind of salt-containing liquid concentration devices, including outer frame, outer frame is provided with the raw solution pump component for salt-containing liquid to enter, the output end of raw solution pump component is provided with rough filtration component, the output end of rough filtration component is connected with buffer tank, the output end of buffer tank is connected with heating box, the output end of heating box is connected with tubular heating component by circulating pump connecting pipe, the output end of tubular heating component is connected with atomization spray component, atomization spray component is set in heating box, steam generated by atomization spray component is filtered after passing through filter system, then into air duct system, again condensed into pure water by cooling system, and flow into water storage tank to be collected;The side plate inside of outer frame is fixed with inlet and outlet liquid plate, and a plurality of quick couplings are installed on inlet and outlet liquid plate;Raw solution pump component includes raw solution pump fixed in outer frame, and the liquid inlet end of raw solution pump is connected with quick coupling by pipeline, and the liquid outlet end is communicated with rough filtration component by pipeline.The device is compact in structure, stable in operation, and widely used.

Description

Technical Field

[0001] This utility model relates to the field of liquid evaporation and separation technology, and in particular to a device for concentrating and recovering pure water from various types of saline liquids such as seawater, brine and industrial saline waste liquid, specifically a saline liquid concentration device. Background Technology

[0002] In industrial production, marine utilization, and resource recycling processes, large quantities of saline liquids (such as seawater, brine, and saline wastewater) require salt separation, volume reduction, or pure water recovery. Traditional saline liquid evaporation and concentration devices often have the following shortcomings: Pre-treatment capacity is limited. Existing systems mostly use single-stage filtration or simple sedimentation, which can only remove larger particulate impurities and cannot effectively filter fine silt, rust and microorganisms. This leads to scaling and blockage in subsequent heating and heat transfer pipelines, resulting in a significant decrease in operating efficiency.

[0003] Heating methods are energy-intensive. Most devices use direct heating or open heating methods, resulting in significant heat loss; at the same time, the liquid atomization effect is poor, the droplets are large, and the evaporation rate is slow, leading to high system energy consumption.

[0004] The condensation system is inefficient. Traditional condensers have a simple structure, disordered steam flow, and limited heat transfer area, resulting in a low condensation rate and poor pure water collection efficiency; moreover, waste heat cannot be effectively recovered and utilized.

[0005] The system has a low level of automation. Many devices lack liquid level detection, temperature control, and valve linkage control, requiring frequent manual operation and making it difficult to achieve continuous and stable operation.

[0006] Waste liquid treatment is inadequate. Concentrated residues and filtered waste liquids are often discharged directly, which not only wastes resources but may also pollute the environment.

[0007] Therefore, there is an urgent need for a salt liquid concentration device that can integrate pretreatment, heating atomization, condensation recovery, waste liquid treatment and intelligent control to achieve energy-saving efficiency, automated operation and applicability to multiple scenarios. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a salt liquid concentration device, thereby solving the problems of low filtration accuracy, high energy consumption and insufficient automation in existing salt liquid treatment systems, and realizing efficient concentration and pure water recovery of various types of liquids such as seawater, brine and industrial salt waste liquid.

[0009] The objective of this utility model is achieved through the following technical solution: A salt liquid concentration apparatus, comprising: The outer frame houses a stock solution pump assembly for the entry of saline liquid. A coarse filter assembly is located at the output end of the stock solution pump assembly. A buffer tank is connected to the output end of the coarse filter assembly. A heating chamber is connected to the output end of the buffer tank. A tubular heating assembly is connected to the output end of the heating chamber via a circulating pump. An atomizing spray assembly is connected to the output end of the tubular heating assembly. The atomizing spray assembly is located within the heating chamber. The steam generated by the atomizing spray assembly is filtered by a filtration system and then enters an air duct system. It is then cooled by a cooling system, and the cooled steam flows into a water storage tank for collection.

[0010] In one or more embodiments of this utility model, an inlet / outlet plate is fixed to the inner side of the side plate of the outer frame, and a plurality of quick-connect fittings are installed on the inlet / outlet plate; the raw liquid pump assembly includes a raw liquid pump fixed inside the outer frame, the inlet end of the raw liquid pump is connected to one of the quick-connect fittings through a pipe, and the outlet end of the raw liquid pump is connected to the coarse filter assembly through a pipe.

[0011] In one or more embodiments of this utility model, the coarse filtration assembly includes a stainless steel backwash filter fixed in the outer frame, a float valve is provided between the stainless steel backwash filter and the raw liquid pump assembly, and a first solenoid valve is provided between the stainless steel backwash filter and the buffer tank.

[0012] In one or more embodiments of this utility model, the buffer tank and the heating tank are connected by a pipe, the tubular heating assembly is used to connect the heating tank and the circulation pump, the tubular heating assembly includes a tubular heater installed on the pipe, the tubular heater adopts a sleeve structure to isolate the heating element from the liquid, and the liquid is heated by the heating element.

[0013] In one or more embodiments of this utility model, the atomizing spray assembly includes a thick pipe fixed inside the heating chamber, the thick pipe being connected to a tubular heating assembly, a plurality of spray pipes being connected to the thick pipe, and a plurality of atomizing heads being installed on the spray pipes; a liquid level sensor is also installed on the side wall of the heating chamber.

[0014] In one or more embodiments of this utility model, the filtration system includes a filter frame disposed within a heating chamber. Two opposing inner sidewalls of the filter frame are provided with clamping plate assemblies, which allow the filter membrane assembly to be more securely fixed. Each clamping plate assembly includes clamping plates fixed to the inner sidewalls of the filter frame, and each clamping plate has an inverted triangular structure. The filter membrane assembly includes a first filter shaft fixed to the lower end of each clamping plate, and a second filter shaft spanning the upper ends of adjacent clamping plates. The second filter shaft is located above the first filter shaft and is arranged correspondingly to a spray pipe. A plurality of first filter shafts and a plurality of second filter shafts are arranged in an alternating pattern. A filter membrane is disposed on each filter shaft, and the filter membrane forms a plurality of triangular cavity structures, with the corresponding spray pipe located within the respective triangular cavity.

[0015] In one or more embodiments of this utility model, the air duct system includes an air box fixed within an outer frame. The air box is divided into a left cavity and a right cavity by a partition. A front door is provided on the front side of the right cavity, and a side door is provided on the side of the left cavity. The upper side of the heating box is open, and the upper opening of the heating box is connected to a rectangular opening at the bottom of the air box and communicates with the right cavity. A rectangular hole is provided on the partition. The cooling system includes a finned condenser fixed on the left side of the partition, and the finned condenser is located in the left cavity. A compressor and a sleeve condenser are also fixed within the outer frame. The compressor is connected to the finned condenser through a pipe, and the sleeve condenser is connected to the finned condenser and the compressor through pipes respectively. Two axial flow fans are fixed on the air box. The air inlet of the axial flow fans extends into the left cavity of the air box. The axial flow fans are used to draw the gas in the air box outward, so that an airflow is formed in the air box, thereby causing the steam generated by the atomizing spray assembly to flow to the surface of the finned condenser for condensation.

[0016] In one or more embodiments of this utility model, a recycling system is further provided inside the outer frame. The recycling system includes a first recycling pipe and a second recycling pipe. One end of the first recycling pipe is connected to the pipeline between the circulation pump and the tubular heating assembly, and the other end of the first recycling pipe is connected to the second recycling pipe. One end of the second recycling pipe is connected to the output end of the coarse filter assembly, and the other end is connected to the quick connector on the inlet and outlet liquid plates, so as to discharge the high-concentration liquid evaporated inside the heating box and the sewage filtered by the coarse filter assembly. A second solenoid valve, a check valve, and a discharge pump are installed on both the first recycling pipe and the second recycling pipe.

[0017] In one or more embodiments of this utility model, a heat insulation system is provided outside the heating box and the air box. The heat insulation system includes an upper heat insulation component and a lower heat insulation component. The upper heat insulation component covers the outside of the air box and is composed of several heat insulation boards, which are fixed by screws. Polyurethane foam material is provided between the upper heat insulation component and the air box. The lower heat insulation component includes a heat insulation frame fixed to the bottom of the air box. A heat insulation base is fixed to the bottom of the heat insulation frame by a buckle. The heating box is located inside the heat insulation frame and the heat insulation base. Polyurethane foam material is provided between the lower heat insulation component and the heating box.

[0018] In one or more embodiments of this utility model, the pipe of the tubular heating assembly is wrapped with an insulation layer.

[0019] The beneficial effects of this utility model are: This invention proposes a salt liquid concentration device that employs a double-layer filter screen for graded filtration in a coarse filtration assembly, combined with level linkage control between a buffer tank and a float valve. This effectively removes impurities of different particle sizes, avoids pipe blockage, and ensures stable liquid inflow, solving the problems of insufficient pretreatment and liquid level fluctuations in traditional methods. A tubular heating assembly and an atomizing spray assembly, along with a circulating pump, form a closed-loop heating system, improving atomization efficiency and accelerating evaporation. Simultaneously, an insulation system reduces heat loss, and finned and shell-and-tube condensers recover waste heat and preheat the raw liquid, significantly improving energy utilization. The triangular cavity filter membrane structure of the filtration system increases the steam contact area, efficiently filtering out salt mist and particles, ensuring the purity of the condensate. The duct system guides the orderly flow of steam, and the axial flow fan and condensation structure improve condensation efficiency. An integrated recovery system centrally discharges high-concentration salt solution and filtered wastewater, avoiding environmental pollution and resource waste. The PLC control system achieves automatic regulation of temperature, liquid level, valves, and fans, reducing manual intervention and improving operational stability and safety.

[0020] The device is compact, stable in operation, low in energy consumption, and highly automated. It can be used for seawater desalination and brine concentration, as well as for the volume reduction treatment of industrial saline wastewater, and has broad application prospects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a structural diagram showing the structure after removing the front insulation panel and the front door; Figure 4 This is a structural diagram showing the insulation board, insulation frame, and insulation base removed from the front side. Figure 5 This is a schematic diagram of the filtration system. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] Example

[0024] like Figures 1 to 5 As shown, this embodiment provides a saline liquid concentration device. Through an integrated filtration, heating, atomization, and condensation system, it achieves efficient concentration and pure water recovery of various types of saline liquids, including seawater, brine, and industrial saline waste liquid. It is suitable for coastal areas, shipboard mobile scenarios, and industrial waste liquid reduction applications where pure water is scarce or concentration treatment is required. The device is designed with full consideration of the characteristics of saline and corrosive environments, optimizing aspects such as structural stability, corrosion resistance, and energy utilization to ensure stable operation and efficient pure water production under complex working conditions.

[0025] The outer frame 1 of the device is a cuboid frame welded from high-strength support rods. The support rods are made of high-quality low-carbon steel and undergo surface treatment processes such as rust removal and galvanizing, which greatly improves their corrosion resistance, enabling them to be used for a long time in environments with high humidity, high salinity, or corrosive media without easily rusting. The interior of the frame is divided into upper and lower layers by a 5mm thick steel plate partition. The upper layer is dedicated to the air duct system, providing an independent space for steam flow and condensation; the lower layer is used to install the water storage tank 29 and the lower structure of the heating chamber 3. This layered design not only greatly saves the overall space of the device, but also makes the flow path of steam from heating to condensation more reasonable, reducing unnecessary energy loss.

[0026] The outer frame 1 is covered by a sheet metal painted door panel with a double-layer structure. The inner layer is made of cold-rolled steel plate, and the outer layer is treated with electrostatic spraying to form a uniform and tough paint layer with a surface hardness of HRC30 or higher. Its wear resistance is more than 40% higher than that of ordinary steel plates, effectively resisting the corrosion of environmental factors such as high salt spray and strong ultraviolet rays, and extending the service life of the device. The bottom-mounted casters are made of high-strength nylon and have 360° rotation. Each caster can bear a load of up to 125kg, and the total load capacity of all four casters is 500kg, which fully meets the overall weight requirements of the device. During movement, the noise generated by the wheels contacting the ground is less than 60dB, which will not cause excessive interference to the surrounding environment. The support feet can be adjusted in height via a threaded structure, which can easily adapt to uneven ground and ensure that the device is placed stably. The top air guide grid adopts a streamlined design and is optimized through fluid dynamics simulation to improve the exhaust efficiency by 20%, effectively avoiding the problem of excessive internal temperature of the device due to poor exhaust.

[0027] The inner side of the side plate of the outer frame 1 is fixed with inlet / outlet plates 5, which are made of 8mm thick PVC board, providing excellent corrosion resistance and insulation. The quick-connect fittings installed on these plates are made of brass (304 stainless steel) and nickel-plated, ensuring not only the strength and reliability of the fittings but also enhancing their corrosion resistance, with a insertion / removal life of over 1000 cycles. These quick-connect fittings allow for rapid connection of external raw material pipelines to drain pipes, greatly simplifying the installation process and enabling operators to complete pipeline connections in a short time.

[0028] The raw liquid pretreatment system is a crucial component for ensuring the quality of the condensed pure water and the stability of the system. It consists of a raw liquid pump assembly and a coarse filter assembly. The raw liquid pump 6 is a corrosion-resistant centrifugal pump with a pump body made of 316 stainless steel. The impeller has undergone dynamic and static balance testing, resulting in low vibration and noise during operation, and a flow rate of up to 2m³ / h. 3 With a flow rate of [number] m / h and a head of 15 m, it can meet the needs of conveying saline liquids in different scenarios. Its inlet end is connected to a quick-connect fitting via a PPH pipe, and its outlet end is connected to a stainless steel backwash filter 7. The PPH pipe has excellent temperature resistance (-20℃~100℃) and salt spray corrosion resistance, ensuring that no leakage will occur during long-term transportation of saline liquids.

[0029] The stainless steel backwash filter 7 features a 304 stainless steel outer shell and an internal double-layer filtration structure consisting of a 50-mesh external filter and a 400-mesh plain-woven filter. The external filter effectively intercepts larger particles (≥300μm in diameter), while the plain-woven filter further removes finer particles (≥38μm in diameter) such as mud, rust, etc. The resulting feed liquid has a high impurity removal rate, providing excellent feed for subsequent evaporation and concentration. The filter also features a backwashing function; when impurities accumulate on the filter screen, they can be discharged through backwashing without disassembling the screen, reducing maintenance workload.

[0030] The float valve 8 between the filter and the raw material pump 6 uses a copper valve body (304 stainless steel) and an internal float made of corrosion-resistant engineering plastic. It automatically adjusts the flow rate using a lever principle. When the liquid level in the heating tank 3 reaches the set value, the float rises under buoyancy and closes the valve, stopping the supply of liquid to the heating tank 3. When the liquid level drops, the float sinks, the valve opens, and the supply of liquid continues. The control accuracy error is ≤±5mm, ensuring a stable liquid level in the heating tank 3. The first solenoid valve 9 between the filter and the buffer tank 2 is a two-position two-way valve using high-quality sealing material. Its response time is ≤0.5s, and it can automatically open and close according to the liquid level in the buffer tank 2 in conjunction with the PLC control system, ensuring a continuous supply of raw material.

[0031] Buffer tank 2 is injection molded from food-grade PE material, with a volume of 50L. Its smooth interior, free of dead corners, facilitates cleaning and disinfection. The liquid level switch installed inside the tank uses infrared sensing technology to detect the liquid level, featuring high accuracy and fast response. When the liquid level is above 80%, the switch sends a signal to the control system to shut down the raw material pump 6, stopping liquid intake. When the liquid level is below 20%, it sends a signal to start the raw material pump 6 to replenish the liquid, preventing the heating element from burning out due to insufficient liquid and thus protecting the equipment. The bottom of buffer tank 2 is designed with a 5° incline, allowing for more thorough liquid drainage, with residual liquid ≤50ml, reducing the possibility of bacterial growth.

[0032] The heating and atomization system is the core component for evaporation and directly affects the concentration efficiency of the device. The heating chamber 3 is welded from 304 stainless steel with a wall thickness of 3mm. It has undergone a water pressure test and can withstand a pressure of 0.3MPa, ensuring no leakage or deformation during heating. Internally, it forms a closed-loop circuit with the circulating pump 4 and the tubular heating components, allowing the saline liquid to circulate and be heated within the system, thus improving energy utilization.

[0033] The circulating pump 4 is a magnetically driven pump with a mechanical seal-free structure. Power is transmitted through magnetic coupling, avoiding leakage caused by mechanical seal wear in traditional centrifugal pumps. The pump's flow rate adjustment range is 0.5~3m³ / h. 3The flow rate can be dynamically adjusted according to the evaporation rate to ensure coordinated heating and atomization processes. The pump body is made of corrosion-resistant material, enabling stable operation in saline environments for extended periods, with a service life exceeding 8000 hours.

[0034] The core of the tubular heating assembly is the sheathed tubular heater 10, whose outer shell is made of 316L stainless steel. The inner heating element is completely isolated from the liquid, avoiding the risk of electric leakage and ensuring high safety. This heater adopts a coiled pipe design, increasing the heating area by more than 30% compared to straight-tube heating elements, achieving a thermal efficiency of over 95%, and rapidly heating the raw liquid to the set temperature. The heater uses a PT100 temperature sensor to monitor the liquid temperature in real time, with a temperature control accuracy of ±0.5℃. The initial temperature rise rate is 25% faster than traditional electric heating tubes, shortening the device start-up time. To reduce heat loss, the pipe is wrapped with a 50mm thick aluminum silicate insulation layer 28, with a thermal conductivity ≤0.03W / (m·K), resulting in a heat loss rate of less than 5%.

[0035] The atomizing spray assembly consists of a thick pipe, spray pipes 11, and atomizing heads. The thick pipe is connected to the liquid outlet of the tubular heater 10 and employs a variable diameter design to ensure uniform fluid distribution to each spray pipe 11. Four spray pipes 11 branching from the thick pipe are radially distributed, each spray pipe 11 equipped with six spiral atomizing heads. This atomizes the high-temperature liquid into fine droplets with a diameter of 5-10 μm, significantly increasing the contact area with air and accelerating the evaporation process. The liquid level sensor 12 installed on the side walls of the heating chamber is an immersion-type hydrostatic sensor with a measurement range of 0-500 mm and an accuracy of ±1 mm. It monitors the liquid level inside the chamber in real time and feeds it back to the control system.

[0036] The filtration system removes salt spray and particulates from the steam, ensuring the quality of the purified water after condensation. The filter frame 30 is injection molded from virgin PP sheet, possessing high impact resistance, not becoming brittle at low temperatures, and exhibiting good dimensional stability. The filter frame 30 has openings on both the top and bottom, and its two opposing inner sidewalls are equipped with clamping plate assemblies. These clamping plate assemblies include clamping plates 13 fixed to the inner sidewalls of the filter frame 30. Each clamping plate 13 has an inverted triangular structure, providing stable support for the filter membrane assembly and preventing it from shaking or falling off under the impact of high-speed airflow.

[0037] The filter membrane assembly includes a first filter shaft 14 fixed to the lower end of each clamping plate 13, and a second filter shaft 15 spanning the upper ends of adjacent clamping plates. The second filter shaft 15 is located above the first filter shaft 14, and each second filter shaft 15 is located above a corresponding spray pipe 11. The first filter shafts 14 and the second filter shafts 15 are arranged in an alternating pattern, and the filter shafts are made of glass fiber reinforced PP material. Filter membranes 16 are disposed on the first filter shafts 14 and the second filter shafts 15, forming a plurality of triangular cavity structures, with the spray pipes 11 located within the corresponding triangular cavities. The filter membranes 16 are made of polytetrafluoroethylene (PTFE), which has excellent chemical stability and corrosion resistance, effectively trapping salt spray and microorganisms, resulting in high filtration efficiency. The triangular cavity structure increases the contact area between steam and the filter membrane, further improving filtration efficiency and ensuring the purity of the steam entering the condensation system.

[0038] The filter frame 30 is located inside the heating chamber 3, with its upper part extending into the right cavity of the air box 17, allowing steam to directly enter the filtration system and reducing the mixing of impurities during the transmission process. The clamping plate 13 is made of the same material as the filter frame 30 and has the same coefficient of thermal expansion, avoiding changes in the fitting gap due to temperature changes and ensuring the stability of the filter membrane assembly.

[0039] The duct system provides a reasonable passage for steam flow and condensation. The bellows 17 is made of galvanized steel sheet (304 stainless steel) bent into shape, with a passivated surface to enhance corrosion resistance. The bellows 17 is divided into a left chamber and a right chamber by a partition 18. A front door 19 is located on the front of the right chamber, and a side door is located on the side of the left chamber for easy inspection and maintenance. The doors are fixed with hand-tightened screws and equipped with sealing rings, achieving an IP65 sealing performance. The upper side of the heating chamber 3 has an opening, which connects to the rectangular opening at the bottom of the bellows 17 and communicates with the right chamber, allowing steam generated in the heating chamber 3 to smoothly enter the right chamber of the bellows 17. Rectangular holes are provided on the partition 18 to facilitate steam flow from the right chamber to the left chamber.

[0040] The cooling system includes a finned condenser 21 fixed to the left side of the partition 18 (located in the left cavity), and a compressor 22 and a shell-and-tube condenser 23 installed in the outer frame 1, forming a complete refrigeration cycle system. The system can use environmentally friendly refrigerants such as R410A. The compressor 22 compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, driving the refrigeration cycle; the finned condenser 21 cools and liquefies the high-temperature, high-pressure refrigerant gas, releasing heat, and simultaneously condenses the vapor into liquid pure water; the shell-and-tube condenser 23 assists in heat dissipation and recovers waste heat for preheating the raw liquid, improving energy efficiency. The finned condenser 21 and the compressor 22 are connected by copper tubing to ensure good thermal conductivity and corrosion resistance.

[0041] Two axial flow fans 24 are fixed on the air box 17. The air inlet of the axial flow fans 24 extends into the left cavity of the air box 17. During operation, they draw the gas out of the air box 17, creating a negative pressure inside the air box 17. This causes the steam generated by the atomizing spray assembly to flow onto the finned condenser 21, accelerating the steam condensation process. The airflow and speed of the axial flow fans 24 can be adjusted according to the condensation requirements to ensure that the condensation efficiency matches the evaporation efficiency.

[0042] The recovery system is used to treat high-concentration residual liquid and filtered wastewater generated during the operation of the device, and includes a first recovery pipe 20 and a second recovery pipe 31. One end of the first recovery pipe 20 is connected to the pipeline between the circulating pump 4 and the tubular heating assembly, and the other end is connected to the second recovery pipe 31. One end of the second recovery pipe 31 is connected to the output end of the coarse filter assembly, and the other end is connected to a quick-connect fitting on the inlet / outlet plate. This connection method can centrally discharge the high-concentration liquid evaporated inside the heating chamber 3 and the wastewater filtered by the coarse filter assembly, avoiding accumulation inside the device that could cause corrosion and pollution.

[0043] Both the first recovery pipe 20 and the second recovery pipe 31 are equipped with a second solenoid valve, a check valve, and a discharge pump. The second solenoid valve is used to control the discharge time and volume of waste liquid, and can be automatically controlled by the control system according to the operating conditions; the check valve prevents backflow of waste liquid; the discharge pump is a corrosion-resistant pump that discharges the recovered liquid to an external recovery tank for subsequent treatment or resource utilization.

[0044] The insulation system is used to reduce heat loss during equipment operation and improve energy efficiency. It includes an upper insulation component and a lower insulation component. The upper insulation component covers the outside of the air box 17 and consists of several insulation boards 25. The insulation boards 25 are made of SPCC low carbon steel plates bent and fixed with screws. Polyurethane foam material is filled between the upper insulation component and the air box 17 to improve insulation performance. The lower insulation component covers the outside of the heating chamber 3 and includes an insulation frame 26 fixed to the bottom of the air box 17 and an insulation base 27 fixed by clips. The heating chamber 3 is located inside the insulation frame 26 and the insulation base 27. Polyurethane foam material is also provided between the lower insulation component and the heating chamber 3 to further reduce heat loss.

[0045] The tubular heating component has an external insulation layer 28 covering the pipe. The insulation layer 28 is made of high-quality insulation cotton, which has good insulation and temperature resistance properties, and can effectively reduce the heat loss of high-temperature liquid in the pipe and improve evaporation efficiency.

[0046] The control system is the core of the plant's automated operation, consisting of a PLC, touch screen components, solenoid valve components, circulating pump components, raw material pump components, and various temperature control and liquid level detection components. The PLC receives sensor signals and controls the actions of the actuators according to preset programs to ensure stable operation of the plant.

[0047] In terms of heating control, the heating temperature is set via a touchscreen, and the control system controls the heater's operation. When the temperature sensor detects that the liquid temperature has reached the set value, the heater stops heating; when the liquid temperature is below a certain level, the heater continues heating to maintain the temperature within the set range. The control system employs a PID control algorithm, achieving a control accuracy of ±0.1℃, ensuring a stable and accurate heating process.

[0048] The liquid level control of the buffer tank is achieved through a liquid level sensor: when the liquid level sensor detects that the liquid level in the buffer tank 2 is lower than the set value, it sends a signal to start the raw liquid pump assembly to add liquid to the buffer tank 2; when the liquid level reaches the set value, the liquid addition stops to ensure that there is sufficient liquid supply in the buffer tank 2.

[0049] The liquid inlet control of the heating chamber is controlled by a float and a high liquid level sensor to control the opening and closing of the solenoid valve: when the liquid level in the heating chamber 3 is lower than the set value, the float descends, the high liquid level sensor sends a signal, and the control system opens the solenoid valve to add liquid to the heating chamber 3; when the liquid level reaches the set value, the float rises, the high liquid level sensor sends a signal, and the control system closes the solenoid valve to ensure that the liquid level in the heating chamber 3 is stable.

[0050] The fan operation is controlled based on the set temperature: when the temperature sensor detects that the temperature inside the air box 17 has reached the set value, the control system turns on the fan assembly to accelerate air circulation and improve condensation efficiency; when the temperature is lower than the set value, the control system turns off the fan assembly or reduces its speed to reduce energy consumption.

[0051] The water storage tank 29 is fixed at the bottom of the device and is used to collect the condensed pure water. It can be made of food-grade 304 stainless steel or PE material to ensure that the pure water is not contaminated. The water storage tank 29 is equipped with a liquid level sensor, consisting of high and low liquid level switches: when the liquid level in the water storage tank 29 is low, an alarm is triggered to remind the user to use or drain the water in time; when the liquid level is high, a signal is sent to the control system to stop the production of pure water and avoid overflow and waste. The bottom of the water storage tank 29 is equipped with a drain outlet and valve for easy control of the discharge rate and time.

[0052] The principle of this utility model: After the raw liquid pump assembly 6 introduces the saline liquid, it passes through the double-layer filter screen of the coarse filter assembly 7 to remove impurities of different particle sizes. The filtered raw liquid enters the buffer tank 2, where the liquid level switch controls the inflow to maintain a stable water level. Then, it is precisely replenished to the heating tank 3 via the float valve 8. The raw liquid in the heating tank 3 enters the tubular heating assembly 10 through the circulation pump 4. After being heated to the set temperature, it is sent to the atomizing spray assembly 11 to form fine droplets to accelerate evaporation. The un-atomized liquid flows back to the heating tank 3 for recycling. The generated steam flows upward and passes through the filter membrane 16 of the filtration system (stretched on a triangular cavity structure composed of the first filter shaft 14, the second filter shaft 15, and the clamping plate 13) to remove impurities such as salt mist and microorganisms. The pure steam enters the air vent. The right chamber of the air box 17 of the duct system; the axial flow fan 24 guides steam into the left chamber, where it is condensed into pure water by the finned condenser 21. The heat recovered by the condenser can be used to preheat the raw liquid to improve energy utilization. The condensed pure water flows into the water storage tank 29, which is controlled by high and low liquid level switches. The high-concentration residual liquid and filtered sewage generated by heating are discharged through the first recovery pipe 20 and the second recovery pipe 31 of the recovery system. The entire process is reduced by the heat preservation system (heat preservation board 25, heat preservation frame 26, heat preservation base 27, heat preservation layer 28). The control system is based on PLC and combined with PID algorithm to accurately control the temperature, liquid level and the operation of equipment such as solenoid valve 9 and compressor 22, so as to realize automated and efficient concentration and pure water recovery.

[0053] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A device for concentrating salt-containing liquids, characterized in that, include: The outer frame (1) is provided with a raw liquid pump assembly for the entry of salt liquid. The output end of the raw liquid pump assembly is provided with a coarse filter assembly. The output end of the coarse filter assembly is connected to a buffer tank (2). The output end of the buffer tank (2) is connected to a heating box (3). The output end of the heating box (3) is connected to a tubular heating assembly through a circulation pump (4). The output end of the tubular heating assembly is connected to an atomizing spray assembly. The atomizing spray assembly is located inside the heating box (3). The steam generated by the atomizing spray assembly is filtered by the filtration system and then enters the air duct system. It is then cooled by the cooling system. The cooled steam flows into the water storage tank (29) for collection.

2. The apparatus according to claim 1, characterized in that: The inner side of the side plate of the outer frame (1) is fixed with an inlet / outlet plate (5), and a number of quick-connect fittings are installed on the inlet / outlet plate (5); the raw liquid pump assembly includes a raw liquid pump (6) fixed inside the outer frame (1), the inlet end of the raw liquid pump (6) is connected to one of the quick-connect fittings through a pipe, and the outlet end of the raw liquid pump (6) is connected to the coarse filter assembly through a pipe.

3. The apparatus according to claim 1, characterized in that: The coarse filtration assembly includes a stainless steel backwash filter (7) fixed inside the outer frame (1), and a float valve (8) is provided between the stainless steel backwash filter (7) and the raw liquid pump assembly; a first solenoid valve (9) is provided between the stainless steel backwash filter (7) and the buffer tank (2).

4. The apparatus according to claim 1, characterized in that: The buffer tank (2) and the heating tank (3) are connected by a pipe. The tubular heating assembly is used to connect the heating tank (3) and the circulating pump (4). The tubular heating assembly includes a tubular heater (10) with a pipe. The tubular heater (10) adopts a sleeve structure to isolate the heating element from the liquid and heat the liquid through the heating element.

5. The apparatus according to claim 1, characterized in that: The atomizing spray assembly includes a thick pipe fixed inside the heating chamber (3), the thick pipe being connected to the tubular heating assembly, and a number of spray pipes (11) connected to the thick pipe, with a number of atomizing heads installed on the spray pipes (11); a liquid level sensor (12) is installed on the side wall of the heating chamber (3).

6. The apparatus according to claim 5, characterized in that: The filtration system includes a filter frame (30) disposed inside the heating box (3), and the filter frame (30) has two opposing inner sidewalls provided with a retaining plate assembly for securely installing the filter membrane assembly; The card plate assembly includes card plates (13) fixed on the inner side wall of the filter frame (30), and the card plates (13) are all inverted triangular structures; The filter membrane assembly includes a plurality of first filter shafts (14) and a plurality of second filter shafts (15). Each first filter shaft (14) is disposed at the lower end of a corresponding card plate (13), and each second filter shaft (15) spans the upper end of an adjacent card plate (13) and is located above the first filter shaft (14). A plurality of first filter shafts (14) and a plurality of second filter shafts (15) are arranged in an alternating manner, and each second filter shaft (15) is located above a corresponding spray pipe (11); A filter membrane (16) is installed on both the first filter shaft (14) and the second filter shaft (15). Several filter membranes (16) form several triangular cavity structures, and the spray pipe (11) is located in the corresponding triangular cavity.

7. The apparatus according to claim 1, characterized in that: The air duct system includes a bellows (17) fixed inside the outer frame (1). The bellows (17) is divided into a left cavity and a right cavity by a partition (18). A front door (19) is provided on the front side of the right cavity, and a side door is provided on the side of the left cavity. The upper side of the heating box (3) is open, and the upper opening of the heating box (3) is connected to the rectangular opening at the bottom of the air box (17) and communicates with the right cavity. The partition (18) has a rectangular hole; The cooling system includes a finned condenser (21) fixed to the left side of the partition (18), the finned condenser (21) being located in the left cavity; The outer frame (1) also has a compressor (22) and a shell-and-tube condenser (23) fixed inside. The compressor (22) is connected to the finned condenser (21) through a pipe, and the shell-and-tube condenser (23) is connected to the finned condenser (21) and the compressor (22) through pipes respectively. Two axial flow fans (24) are fixed on the air box (17). The air inlet of the axial flow fan (24) extends into the left cavity of the air box (17) to draw the gas in the air box (17) outward, so that airflow is formed in the air box (17), thereby causing the steam generated by the atomizing spray assembly to flow to the surface of the finned condenser (21) for condensation.

8. The apparatus according to claim 2, characterized in that: The outer frame (1) is also provided with a recycling system, which includes a first recycling pipe (20) and a second recycling pipe (31). One end of the first recovery pipe (20) is connected to the pipe between the circulation pump (4) and the tubular heating assembly, and the other end of the first recovery pipe (20) is connected to the second recovery pipe (31). One end of the second recovery tube (31) is connected to the output end of the coarse filter assembly, and the other end is connected to a quick connector on the inlet / outlet liquid plate (5); The first recovery pipe (20) and the second recovery pipe (31) are each equipped with a second solenoid valve, a check valve and a discharge pump, which are used to discharge the high-concentration liquid and the sewage filtered by the coarse filter assembly in the heating box (3).

9. The apparatus according to claim 7, characterized in that: Both the heating box (3) and the air box (17) are equipped with a heat preservation system, which includes an upper heat preservation component and a lower heat preservation component. The upper insulation component covers the outside of the air box (17) and is composed of several insulation boards (25), which are fixed by screws; A polyurethane foam material is provided between the upper insulation component and the air box (17); The lower insulation component covers the outside of the heating box (3) and includes an insulation frame (26) fixed to the bottom of the air box (17) and an insulation base (27) fixed by a buckle. Polyurethane foam material is provided between the lower insulation component and the heating box (3).

10. The apparatus according to claim 4, characterized in that: The tubular heating assembly has an insulation layer (28) wrapped around the outside of the pipe.

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