A high-salinity water concentration and reduction advanced treatment device

Abstract

This invention provides a high-salinity water concentration and reduction advanced treatment device, comprising a membrane module, a thermal circulation system, a cold circulation system, and a collection system. The thermal circulation system includes a flash tank, an electric heater, a thermal circulation heat exchanger, an external heat source, a thermal circulation pump, a condensate collection pump, and a condensate tank. The flash tank is connected to the membrane module and the condensate collection pump via pipelines. The condensate collection pump is also connected to the flash tank via a pipeline. The flash tank is connected to the membrane module via a pipeline. The outlet of the electric heater is connected to the flash tank via a pipeline, and the inlet is connected to the thermal circulation pump via a pipeline. This invention uses the membrane module as the core bridge of the advanced treatment device, making the thermal circulation system, cold circulation system, and collection system both interconnected and relatively independent. The use of the thermal and cold circulation systems reduces heat loss and improves heat exchange efficiency. The use of the collection system increases the freshwater production rate and the concentrate concentration ratio.

Description

Technical Field

[0001] This invention belongs to the field of environmental engineering water treatment technology, and specifically relates to a deep treatment device for high saline concentration and volume reduction. Background Technology

[0002] Currently, in the field of environmental engineering water treatment technology, most existing technologies face the problems of high investment costs and poor corrosion and scaling resistance when performing deep desalination of high saline water. If pretreatment is required, it will cause corrosion and puncture of the equipment, and leakage will cause serious pollution to the soil and groundwater.

[0003] Although some oil and gas field development companies and refining companies have upgraded their wastewater treatment processes, the deep concentration process in desalination has high operating costs and varies in corrosion and scaling resistance depending on the construction materials. Summary of the Invention

[0004] To address the above problems, the present invention provides a deep treatment device for high brine concentration and volume reduction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-salinity water concentration and reduction deep treatment device includes a membrane module, a thermal circulation system, a cold circulation system, and a collection system;

[0007] The heat circulation system includes a flash tank, an electric heater, a heat circulation heat exchanger, an external heat source, a heat circulation pump, a condensate collection pump, and a condensate tank.

[0008] The flash tank is connected to the membrane module and the condensate collection pump via pipelines. The condensate collection pump is also connected to the flash tank via a pipeline. The flash tank is connected to the membrane module via a pipeline.

[0009] The outlet of the electric heater is connected to the flash tank via a pipeline, and the inlet is connected to the heat circulation pump via a pipeline. The outlet of the heat circulation heat exchanger is connected to the flash tank via a pipeline, and the inlet is connected to the heat circulation pump via a pipeline.

[0010] The inlet and outlet of the external heat source are both connected to a heat circulation pump;

[0011] Both the collection system and the cold circulation system are connected to the membrane module.

[0012] Preferably, a second ball valve is provided in the pipeline between the outlet of the electric heater and the flash tank, a third ball valve is provided in the pipeline between the inlet of the electric heater and the heat circulation pump, a fourth ball valve is provided in the pipeline between the heat circulation heat exchanger and the heat circulation pump, and a first ball valve is provided in the pipeline between the heat circulation heat exchanger and the flash tank.

[0013] Both the electric heater and the flash tank are connected to a temperature sensor.

[0014] A pressure sensor is also installed on the pipeline connecting the flash tank and the membrane module.

[0015] Preferably, the cold circulation system includes a cold circulation tank, a cold circulation pump, a cold circulation heat exchanger, a cooling water circulation pump, and a cooling tower;

[0016] The inlet of the cold circulation tank is connected to the membrane module via a pipeline, and the outlet is connected to the cold circulation pump via a pipeline. The cold circulation pump is connected to the cold circulation heat exchanger via a pipeline.

[0017] The outlet of the cooling tower is connected to the cooling water circulation pump via a pipeline, and the inlet is connected to the cold circulation heat exchanger via a pipeline. The cooling water circulation pump is connected to the cold circulation heat exchanger via a pipeline.

[0018] The cold circulation heat exchanger is also connected to the membrane module through a pipeline, and a fifth ball valve and a temperature sensor are also installed on the pipeline between the cold circulation heat exchanger and the membrane module.

[0019] A temperature sensor is also installed on the pipeline connecting the cold circulation tank and the membrane module.

[0020] Preferably, the collection system includes a concentrate tank, a wetting tank, and a product water tank;

[0021] The concentrate tank, wetting tank, and product water tank are all connected to the membrane module via pipelines;

[0022] The wetting tank is also connected to a wetting pump, which is also connected to a concentrate tank.

[0023] The concentrate tank is also connected to a density meter.

[0024] Preferably, the water production tank is also connected to a first freshwater discharge pump, the first freshwater discharge pump is connected to a freshwater tank through a pipeline, a conductivity meter is also installed on the pipeline between the first freshwater discharge pump and the freshwater tank, and the freshwater tank is also connected to a second freshwater discharge pump.

[0025] Preferably, the outlet of the concentrate tank is connected to a concentrate pump, and the outlet of the concentrate pump is connected to a concentrate tank, a cleaning water tank, and a raw water tank via pipelines.

[0026] Preferably, the pipeline between the concentrate pump and the concentrate tank is also equipped with an explosion-proof electric ball valve, and the outlet of the concentrate tank is also connected to a concentrate discharge pump.

[0027] Preferably, the pipeline between the concentrate pump and the cleaning water tank is also equipped with an explosion-proof electric ball valve.

[0028] Preferably, the pipeline between the concentrate pump and the raw water tank is also equipped with an explosion-proof electric ball valve, the raw water tank is also connected to the membrane module by a pipeline, and a seventh ball valve, an eighth ball valve and a flow meter are sequentially installed on the pipeline between the raw water tank and the membrane module;

[0029] The raw water tank is also connected to a precision filter via a pipeline. An explosion-proof electric ball valve is installed on the pipeline between the raw water tank and the precision filter. A ninth ball valve is also installed at the inlet end of the precision filter.

[0030] Preferably, the seventh ball valve is further connected to a sixth ball valve, which is connected to the cleaning water tank.

[0031] Preferably, it also includes a clean water tank and a clean water pipeline;

[0032] The outlet of the clean water tank is connected to the clean water pipeline;

[0033] The clean water pipeline is connected to the cold mixing tank and the flash tank, respectively.

[0034] Preferably, it also includes a vacuum pump, which is connected to the cold circulation tank, flash tank, condenser tank, concentrate tank, wetting tank and product water tank through a vacuum pipeline to provide negative pressure.

[0035] The beneficial effects of this invention are:

[0036] 1. This invention uses a membrane module as the core bridge of the deep treatment device, so that the thermal circulation system, cold circulation system, and collection system are both interconnected and relatively independent; by using the thermal circulation system and cold circulation system, heat loss is reduced and heat exchange efficiency is improved; by using the collection system, the freshwater production rate and the concentrate concentration ratio are increased.

[0037] 2. This invention uses a vacuum pump to draw the membrane module, flash tank, cold circulation tank, product water tank, wetting tank, and concentrate tank into a high-salinity concentration and reduction deep treatment device, so that the entire deep treatment device operates under negative pressure. By evacuating the membrane module, the permeate side is placed in a low-pressure state, and the vapor on the permeate side is extracted and condensed on one side of the condenser plate to obtain distilled water. It has the advantages of low heat loss, high membrane flux, no environmental pollution, good product water quality, and high desalination rate.

[0038] 3. Compared with traditional concentration process devices, the high-salinity water concentration and reduction deep treatment device of the present invention is characterized by vacuum / negative pressure operation, and the membrane module is designed with multi-effect unit combination, which has lower operating temperature and pressure, higher concentration efficiency, 100% theoretical rejection rate for non-volatile components, and can treat heat-sensitive substances and high-concentration saline wastewater.

[0039] 4. The membrane module in the deep treatment device of this invention has the characteristics of strong hydrophobicity, strong acid and alkali resistance, high temperature resistance, good chemical stability and long service life. It solves the problem of easy corrosion and scaling of conventional metal material evaporators. While concentrating at high concentration, the fresh water produced is of good quality and can be used as flushing water or discharged in compliance with standards, which is environmentally friendly.

[0040] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of a high-salinity water concentration and reduction deep treatment device according to the present invention is shown;

[0043] Figure 2 A structural diagram of the membrane module in this invention is shown.

[0044] In the diagram: 1. Clean water tank; 2. Vacuum pump; 3. Cold circulation tank; 4. Vacuum pipeline; 5. Temperature sensor; 6. Pressure sensor; 7. Membrane module; 701. Hot circulation chamber; 702. Feed liquid chamber; 703. Membrane; 704. Fresh water chamber; 705. Condenser; 706. Concentrate chamber; 707. Cold circulation chamber; 8. Wetting pump; 9. Clean water pipeline; 10. Flash tank; 11. Electric heater; 12. First ball valve; 1201. Second ball valve; 1202. Third ball valve; 1203. Fourth ball valve; 1204. Fifth ball valve; 1205. Sixth ball valve; 1206. Seventh ball valve; 1207. Eighth ball valve. Valve; 1208, Ninth Ball Valve; 13, Heat Circulation Heat Exchanger; 14, External Heat Source; 15, Flow Meter; 16, Heat Circulation Pump; 17, Precision Filter; 18, Explosion-proof Electric Ball Valve; 19, Raw Water Tank; 20, Condensate Collection Pump; 21, Condensate Tank; 22, Densitometer; 23, Cleaning Water Tank; 24, Concentrate Pump; 25, Concentrate Tank; 26, Wetting Tank; 27, Concentrate Tank; 28, Concentrate Drain Pump; 29, Freshwater Tank; 30, First Freshwater Drain Pump; 31, Conductivity Meter; 32, Second Freshwater Drain Pump; 33, Product Water Tank; 34, Cold Circulation Pump; 35, Cold Circulation Heat Exchanger; 36, Cooling Water Circulation Pump; 37, Cooling Tower. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] A high-salinity water concentration and reduction deep treatment device includes a membrane module 7, a thermal circulation system, a cold circulation system, and a collection system;

[0047] The heat circulation system includes a flash tank 10, an electric heater 11, a heat circulation heat exchanger 13, an external heat source 14, a heat circulation pump 16, a condensate collection pump 20, and a condensate tank 21.

[0048] The flash tank 10 is connected to the membrane module 7 and the condensate collection pump 20 through pipelines. The condensate collection pump 20 is also connected to the flash tank 10 through a pipeline. The flash tank 10 is connected to the membrane module 7 through a pipeline.

[0049] The outlet of the electric heater 11 is connected to the flash tank 10 through a pipeline, and the inlet is connected to the heat circulation pump 16 through a pipeline. The outlet of the heat circulation heat exchanger 13 is connected to the flash tank 10 through a pipeline, and the inlet is connected to the heat circulation pump 16 through a pipeline.

[0050] The inlet and outlet of the external heat source 14 are both connected to the heat circulation pump 16;

[0051] Both the collection system and the cold circulation system are connected to membrane module 7.

[0052] It should be noted that this invention is implemented around membrane module 7, which mainly consists of a thermal cycle system, a cold cycle system, a collection system, and membrane module 7. This process is driven by a heat source, using the residual heat of concentrated brine to reach 70-80°C. The vapor pressure difference across the membrane serves as the mass transfer driving force, and a hydrophobic microporous membrane acts as the transfer medium. Due to the membrane's hydrophobicity, water cannot permeate through the membrane, while gas passes through the membrane pores for mass transfer, thereby achieving solution concentration and separation.

[0053] It should be noted that, as Figure 2As shown, the membrane module 7 includes a hot circulation chamber 701, a cold circulation chamber 707, two condenser plates 705, and two membrane plates 703. The membrane plates 703 and condenser plates 705 alternately form different chambers, forming a feed liquid chamber 702, two fresh water chambers 704, and a concentrate chamber 706. The fresh water chambers 704 are located on both sides of the concentrate chamber 706. The feed liquid chambers 702 and the cold circulation chambers 707 are located on the outside of the two fresh water chambers 704, and the hot circulation chamber 701 is located on the outside of the feed liquid chamber 702. The hot circulation chambers 701 and the cold circulation chambers 707 are located at both ends of the membrane module 7.

[0054] The cold circulation chamber 707 is connected to the cold circulation system, the hot circulation chamber 701 is connected to the hot circulation system, the raw material liquid chamber 702 is connected to the raw water tank 19, and the fresh water chamber 704 and the concentrated liquid chamber 706 are both connected to the collection system.

[0055] like Figure 2 The schematic diagram of the working principle of membrane module 7 shows that the membrane 703 in membrane module 7 is a hydrophobic microporous membrane, which serves as the transfer medium. Due to the hydrophobicity of the membrane, water solution cannot permeate through the membrane, while gas passes through the membrane pores for mass transfer, thereby achieving solution concentration and separation. Since only water vapor can permeate through the membrane pores in membrane distillation, the pure water recovery rate is high and the water quality is higher than that of reverse osmosis membrane water. It can treat and reuse extremely high concentrations of saline water, and theoretically, the water production rate can reach 100%.

[0056] The advanced treatment unit operates under negative pressure. As the temperature rises, the water in the high-salinity water is converted into steam, which passes through the membrane 703, encounters the condenser plate 705, is condensed and collected, and the concentrate retains its original form and enters the next stage, achieving further separation of fresh water and concentrate.

[0057] The heat cycle mainly involves heating the raw material liquid, using water in the condenser as the medium for heat exchange. The pipeline connection is described in the previous section and is a closed loop.

[0058] The cold circulation mainly cools the produced water, using the water in cooling tower 37 as the medium for heat exchange. The pipeline connection is described in the previous section and is a closed loop.

[0059] Several sets of membrane sheets 703 and condenser sheets 705 can be installed in the membrane module 7 as needed, and they can be arranged alternately. The distilled water produced in the desalination chamber 704 goes to the product water tank 33, and the concentrate produced in the concentrate chamber 706 goes to the wetting tank 26 or the concentrate tank 25.

[0060] The membrane module 7 is a multi-effect vacuum membrane. Its feature is that the membrane module 7 is evacuated to a low-pressure state by the vacuum pump 2, which has higher condensation efficiency on the permeate side, significantly reduces heat loss, and improves membrane flux. It also utilizes the multi-stage flash evaporation principle to establish a microscopic multi-effect membrane distillation, which greatly shortens the time for water molecules to go from evaporation to condensation. This makes the multi-effect membrane distillation process closer to the thermodynamic reversible process, improving heat utilization and water production ratio.

[0061] It should be noted that the membrane 703 in the membrane module 7 of the deep treatment device of the present invention can be made of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyethylene (PE) and polypropylene (PP). The present invention preferably uses polytetrafluoroethylene (PTFE) material, which has the characteristics of strong hydrophobicity, resistance to strong acids and alkalis, high temperature resistance, good chemical stability and long service life. It solves the problem of easy corrosion and scaling of conventional metal material evaporators. While concentrating at high concentration, the fresh water produced is of good quality and can be used as flushing water or discharged in compliance with standards, which is environmentally friendly.

[0062] The heat circulation system provides heat transfer power for the raw material liquid of the entire system. The external heat source 14 can use the waste heat (hot water or steam) of the plant area to replace the electric heater 11. The precision filter 17 is installed at the front end of the raw water tank 19, which can reduce turbidity and suspended solids.

[0063] Furthermore, a second ball valve 1201 is installed in the pipeline between the outlet of the electric heater 11 and the flash tank 10, a third ball valve 1202 is installed in the pipeline between the inlet of the electric heater 11 and the heat circulation pump 16, a fourth ball valve 1203 is installed in the pipeline between the heat circulation heat exchanger 13 and the heat circulation pump 16, and a first ball valve 12 is installed in the pipeline between the heat circulation heat exchanger 13 and the flash tank 10.

[0064] Both the electric heater 11 and the flash tank 10 are connected to a temperature sensor 5;

[0065] A pressure sensor 6 is also installed on the pipeline connecting the flash tank 10 and the membrane module 7.

[0066] Furthermore, the cold circulation system includes a cold circulation tank 3, a cold circulation pump 34, a cold circulation heat exchanger 35, a cooling water circulation pump 36, and a cooling tower 37;

[0067] The inlet of the cold circulation tank 3 is connected to the membrane module 7 via a pipeline, and the outlet is connected to the cold circulation pump 34 via a pipeline. The cold circulation pump 34 is connected to the cold circulation heat exchanger 35 via a pipeline.

[0068] The outlet of the cooling tower 37 is connected to the cooling water circulation pump 36 through a pipeline, and the inlet is connected to the cold circulation heat exchanger 35 through a pipeline. The cooling water circulation pump 36 is connected to the cold circulation heat exchanger 35 through a pipeline.

[0069] The cold circulation heat exchanger 35 is also connected to the membrane module 7 via a pipeline. A fifth ball valve 1204 and a temperature sensor 5 are also installed on the pipeline between the cold circulation heat exchanger 35 and the membrane module 7.

[0070] A temperature sensor 5 is also installed on the pipeline connecting the cold circulation tank 3 and the membrane module 7.

[0071] It should be noted that the cold circulation system provides condensate to the membrane module 7. Temperature sensors 5 are designed on both the outlet and return water pipes of the cold circulation tank 3 to monitor the temperature of the condensate entering and leaving the membrane module 7 in real time. Pressure sensors 6 are designed on both sides of the membrane module 7 to monitor the pressure at the hot and cold ends of the vacuum system in real time.

[0072] Furthermore, the collection system includes a concentrate tank 25, a wetting tank 26, and a product water tank 33;

[0073] Concentrate tank 25, wetting tank 26 and product water tank 33 are all connected to membrane module 7 via pipelines;

[0074] The wetting tank 26 is also connected to the wetting pump 8, which is also connected to the concentrate tank 25.

[0075] The concentrate tank 25 is also connected to a density meter 22.

[0076] Furthermore, the water production tank 33 is also connected to a first freshwater discharge pump 30, which is connected to a freshwater tank 29 via a pipeline. A conductivity meter 31 is also installed on the pipeline between the first freshwater discharge pump 30 and the freshwater tank 29. The freshwater tank 29 is also connected to a second freshwater discharge pump 32.

[0077] Furthermore, the outlet of the concentrate tank 25 is connected to a concentrate pump 24, and the outlet of the concentrate pump 24 is connected to a concentrate tank 27, a cleaning water tank 23 and a raw water tank 19 via pipelines.

[0078] It should be noted that the permeate from product water tank 33 can be pumped into a temporary freshwater tank 29 via a first freshwater discharge pump 30. The outlet of the first freshwater discharge pump 30 is equipped with a conductivity meter 31, which can monitor the conductivity of the permeate in real time and determine the quality of the current permeate. The permeate from concentrate tank 25 can be pumped into a temporary concentrate tank 27 via a concentrate pump 24 or returned to the raw water tank 19. A density meter 22 is installed on concentrate tank 25, and the density value can be set to determine whether the concentrate meets the standard and is discharged into concentrate tank 27, while the concentrate that does not meet the standard is returned to raw water tank 19.

[0079] Furthermore, an explosion-proof electric ball valve 18 is installed in the pipeline between the concentrate pump 24 and the concentrate tank 27, and a concentrate discharge pump 28 is connected to the outlet of the concentrate tank 27.

[0080] Furthermore, an explosion-proof electric ball valve 18 is installed in the pipeline between the concentrate pump 24 and the cleaning water tank 23.

[0081] Furthermore, an explosion-proof electric ball valve 18 is installed in the pipeline between the concentrate pump 24 and the raw water tank 19. The raw water tank 19 is also connected to the membrane module 7 by a pipeline, and a seventh ball valve 1206, an eighth ball valve 1207 and a flow meter 15 are sequentially installed in the pipeline between the raw water tank 19 and the membrane module 7.

[0082] The raw water tank 19 is also connected to a precision filter 17 via a pipeline. An explosion-proof electric ball valve 18 is also installed on the pipeline between the raw water tank 19 and the precision filter 17. A ninth ball valve 1208 is also installed at the inlet end of the precision filter 17.

[0083] Furthermore, the seventh ball valve 1206 is also connected to the tenth ball valve 1209, which is connected to the cleaning water tank 23.

[0084] It should be noted that the raw water tank 19, cleaning water tank 23, concentrated water tank 27, and desalinated water tank 29 are all equipped with remote level gauges. When the liquid level in the raw water tank 19 is low, the system will automatically stop; when it is at a medium level, the explosion-proof electric ball valve 18 will automatically open to replenish water; and when it is at a high level, the explosion-proof electric ball valve 18 will automatically close. Both the concentrated water tank 27 and the desalinated water tank 29 will automatically stop the concentrated water discharge pump 28 and the second desalinated water discharge pump 32 when the liquid level is low, and will automatically start the concentrated water discharge pump 28 and the second desalinated water discharge pump 32 when the liquid level is high. The cold circulation tank 3, flash tank 10, condenser tank 21, concentrate tank 25, wetting tank 26, and product water tank 33 are all equipped with float level gauges. These gauges have low, medium, and high level switches, which are interlocked with the corresponding concentrate pump 24, wetting pump 8, and first freshwater discharge pump 30. When the level is medium, the pump discharge function is activated; at low level, the pump automatically stops; and at high level, the system issues a real-time alarm. Several manual ball valves (first ball valve 12, second ball valve 1201, third ball valve 1202, fourth ball valve 1203, fifth ball valve 1204, sixth ball valve 1205, seventh ball valve 1206, eighth ball valve 1207, ninth ball valve 1208, and tenth ball valve 1209) are installed in the system for maintenance, repair, or process switching. These valves are preset according to the operating mode before system startup. The inlet flow rate is recorded by flow meter 15, and the flow rate can be adjusted via the manual ball valve upstream of flow meter 15.

[0085] Furthermore, it also includes a clean water tank 1 and a clean water pipeline 9; the membrane distillation system consumes a portion of clean water during operation, and the clean water tank 1 can replenish water to the flash tank 10 and the cold circulation tank 3 through the clean water pipeline 9.

[0086] The outlet of clean water tank 1 is connected to clean water pipeline 9;

[0087] The clean water pipeline 9 is connected to the cold circulation tank 3 and the flash tank 10 respectively.

[0088] Furthermore, it also includes a vacuum pump 2, which is connected to the cold circulation tank 3, flash tank 10, condenser tank 21, concentrate tank 25, wetting tank 26 and product water tank 33 via vacuum pipeline 4 to provide negative pressure.

[0089] This invention addresses the problems of poor corrosion resistance and scaling, as well as high investment costs, associated with conventional deep desalination processes used in resource development involving high-salinity water. The device employs multi-effect membrane distillation technology made of corrosion-resistant non-metallic materials, resistant to acids, alkalis, and oxidants, and offers significant cost advantages, making it an important alternative to existing metal evaporators. The purpose of using this invention is to concentrate the solution to near-saturation, depending on the material, thereby reducing the amount of crystallization water required for subsequent evaporation and ultimately lowering the overall system energy consumption.

[0090] The working process of this invention is as follows:

[0091] After passing through the precision filter 17, the feed solution enters the raw water tank 19. Upon starting the membrane distillation system, the feed solution in the raw water tank 19 enters the membrane module 7, which includes multiple membrane sheets 703 and condenser plates 705. The feed solution's temperature rises and evaporates under vacuum. The generated vapor passes through the membrane sheets 703 and is separated from the feed. The membrane module 7 separates the feed solution into concentrate and vapor. The concentrate flows through a pipeline into the concentrate tank 25. The concentrate in the concentrate tank 25 is pumped by the concentrate pump 24 into either the raw water tank 19 or the concentrate tank 27. Concentrate meeting the set concentration value enters the concentrate tank 27, while concentrate not meeting the set value returns to the raw water tank 19 for recirculation. After the membrane is wetted, the feed solution left on the membrane wall flows from the membrane module 7 into the wetting tank 26, then is pumped by the wetting pump 8 to the concentrate tank 25, and then pumped by the concentrate pump 24 into either the concentrate tank 27 or the raw water tank 19, forming a cycle. The generated steam enters the double-effect membrane module 7 to heat the feed liquid and is condensed and collected in the product water tank 33. The fresh water in the product water tank 33 enters the fresh water tank 29 via the first fresh water discharge pump 30.

[0092] Cooling tower 37 and cold circulation heat exchanger 35 provide cooling water for the cold end of the membrane in the entire unit. There are two streams of cold circulation water: one is internal system cold circulation water, and the other is external system cold circulation water. The internal system cold circulation water comes out of cold circulation tank 3, passes through cold circulation pump 34 to cold circulation heat exchanger 35, and then enters membrane module 7. After exiting membrane module 7, it returns to cold circulation tank 3. The external system cold circulation water comes out of cooling tower 37, passes through external cooling water circulation pump 36 to cold circulation heat exchanger 35, and then returns to cooling tower 37.

[0093] The electric heater 11 and the heat exchanger 13 provide steam to the hot end of the membrane for the entire device. The hot water flows out of the flash tank 10 and reaches the electric heater 11 (or the heat exchanger 13) via the heat pump 16. After exiting the electric heater 11 (or the heat exchanger 13), it enters the flash tank 10 again. The water entering the flash tank 10 flashes and generates steam, which then enters the membrane module 7. The condensate that comes out of the membrane module 7 enters the condenser 21. The water in the condenser 21 returns to the flash tank 10 via the condensate collection pump 20, completing the hot end cycle.

[0094] It should be noted that the deep processing device of the present invention integrates all the equipment in the process onto a single skid, adopts an integrated automated control design, and forms an independent module. The entire skid is equipped with locking rollers for easy loading and unloading of containers. It features a small overall footprint, convenient installation and transportation, and is suitable for operation in various indoor and outdoor environments. The entire system operates fully automatically and is simple to operate and maintain.

[0095] It should be noted that the operating conditions of this invention in the field are as follows:

[0096] 1. The device has an easy-to-operate automatic operation mode. When the cold end vacuum drops to 150 mmbar, the heat circulation pump 16 will start automatically, and the electric heater 11, cold circulation pump 34, and fan in the cooling tower 37 will start automatically in succession. The device will start with clean water and switch to raw water operation when the temperature difference between the inlet and outlet membranes reaches 3.5 degrees.

[0097] 2. This process can concentrate salinity from 4.7% to 14% to over 22%. The optimal temperature range for the flash tank 10 is 58℃-65℃. To ensure the normal operation of the membrane system and prevent crystallization or blockage within the membrane chamber, the influent flow rate should be controlled at 2-4 LPM when the raw water concentration is below 10%, and at 7-10 LPM when the raw water concentration is above 10%. This technology is widely adaptable to different influent water qualities with varying salinity, but it is most energy-efficient when the influent concentration is higher.

[0098] The following uses specific implementation data to verify the operation of this invention:

[0099] Example 1: With a raw water salinity of 10.8%, a flash tank 10 temperature of 65°C, and flow rates set at 7-10 LPM, the freshwater production rate remained between 80-88 L / h, and the freshwater conductivity consistently reached below 350 μS / cm. The concentrate production rate increased with the flow rate, rising from 340 L / h to 500 L / h. After 5 hours of operation, the raw water in the raw water tank 19 underwent continuous circulation, resulting in a concentrate salinity of 23.7%, a 1.19-fold increase in concentration. Once the concentrate reached the system's target value, it entered the concentrate tank 27 and was then discharged via the concentrate discharge pump 28 into the downstream evaporation and crystallization unit for crystallization treatment.

[0100] Example 2: With a raw water salinity of 10.8%, a flash tank 10 temperature of 58°C, and flow rates set at 7-10 LPM, the freshwater production rate remained between 76-84 L / h, and the freshwater conductivity consistently remained below 500 μS / cm. The concentrate production rate increased with increasing flow rate, rising from 344 L / h to 516 L / h. After 5 hours of operation, the raw water in the raw water tank 19 underwent continuous circulation, resulting in a concentrate salinity of 21.3%, a 0.97-fold increase in concentration. Concentration efficiency decreased, and energy consumption was reduced by 16% compared to Example 1.

[0101] Flash tank 10 can operate stably with a temperature setting of 58-65℃. When the temperature of flash tank 10 is set to 65℃, the freshwater production volume is large, the water quality is good, and the concentration of concentrate is high, but the energy consumption is high. Considering both the concentration efficiency and energy consumption, 60℃ is finally selected as the optimal temperature setting for flash tank 10.

[0102] Example 3: The raw water salinity was 14%, the flash tank 10 temperature was 60℃, and the flow rate was set to 7 LPM. As the raw water concentration increased during the circulation process, the freshwater production rate changed very little, remaining between 76 L / h and 84 L / h. The conductivity of the freshwater effluent remained stable below 700 μs / cm. After 3 hours of operation, the concentrate concentration reached the target value of 22%, an increase of 0.57 times. The concentration treatment time was shortened by 40%, and the energy consumption was reduced by 51% compared to Example 2.

[0103] When the salinity of the influent is high, the energy consumption of this device and process is significantly reduced, while the quality of the freshwater produced is slightly increased due to fluctuations in water quality.

[0104] Example 4: The raw water salinity is 4.7%, the temperature of flash tank 10 is 60℃, the flow rate is set to 2-4 LPM, the fresh water production rate is maintained between 84-92 L per hour, the conductivity of the fresh water can reach below 300 μs / cm, and after 3 hours of operation, the raw water concentration reaches 10.35%, which is 1.2 times higher.

[0105] Example 5: The raw water salt content is 7.7%, the temperature of flash tank 10 is 60℃, the flow rate is set to 2-4 LPM, the fresh water production rate is maintained between 84-92 L per hour, the conductivity of the fresh water can reach below 300 μs / cm, and after 3 hours of operation, the raw water concentration reaches 15.6%, which is 1.03 times higher.

[0106] When the temperature of flash tank 10 is set at 60℃, it operates stably. During the process of adjusting the flow rate from 2 to 4, the freshwater production is relatively stable, remaining between 84-92L, and the quality of the produced water is good.

[0107] Compared to Example 4, the concentration of the raw water was increased, the experimental control conditions were the same, the concentration factor decreased by 14%, but the average energy consumption decreased by 15.2%. The lower the raw water concentration, the higher the energy consumption.

[0108] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-salinity water concentration and volume reduction advanced treatment device, characterized in that, Includes membrane module (7), thermal cycle system, cold cycle system and collection system; The heat circulation system includes a flash tank (10), an electric heater (11), a heat circulation heat exchanger (13), an external heat source (14), a heat circulation pump (16), a condensate collection pump (20), and a condensate tank (21). The flash tank (10) is connected to the membrane module (7) and the condensate collection pump (20) through pipelines. The condensate collection pump (20) is also connected to the flash tank (10) through pipelines. The flash tank (10) is connected to the membrane module (7) through pipelines. The outlet of the electric heater (11) is connected to the flash tank (10) through a pipeline, and the inlet is connected to the heat circulation pump (16) through a pipeline. The outlet of the heat circulation heat exchanger (13) is connected to the flash tank (10) through a pipeline, and the inlet is connected to the heat circulation pump (16) through a pipeline. The inlet and outlet of the external heat source (14) are both connected to the heat circulation pump (16); the electric heater (11) and the heat circulation heat exchanger (13) are used to provide steam for the membrane hot end of the deep treatment device. After the hot circulation water comes out of the flash tank (10), it reaches the electric heater (11) or the heat circulation heat exchanger (13) through the heat circulation pump (16). After coming out of the electric heater (11) or the heat circulation heat exchanger (13), it enters the flash tank (10). The water entering the flash tank (10) generates steam through a flash explosion and then enters the membrane module (7). The condensate after coming out of the membrane module (7) enters the condenser (21). The water in the condenser (21) returns to the flash tank (10) through the condensate collection pump (20) to complete the hot end circulation. Both the collection system and the cold circulation system are connected to the membrane module (7); The collection system includes a concentrate tank (25), a wetting tank (26), and a product water tank (33). The concentrate tank (25), wetting tank (26) and product water tank (33) are all connected to the membrane module (7) through pipelines; The wetting tank (26) is also connected to a wetting pump (8), which is also connected to a concentrate tank (25); The concentrate tank (25) is also connected to a density meter (22); The water production tank (33) is also connected to a first freshwater discharge pump (30), which is connected to a freshwater tank (29) via a pipeline. The outlet of the concentrate tank (25) is connected to a concentrate pump (24), and the outlet of the concentrate pump (24) is connected to a concentrate tank (27), a cleaning water tank (23) and a raw water tank (19) via pipelines.

2. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 1, characterized in that, A second ball valve (1201) is provided in the pipeline between the outlet of the electric heater (11) and the flash tank (10), a third ball valve (1202) is provided in the pipeline between the inlet of the electric heater (11) and the heat circulation pump (16), a fourth ball valve (1203) is provided in the pipeline between the heat circulation heat exchanger (13) and the heat circulation pump (16), and a first ball valve (12) is provided in the pipeline between the heat circulation heat exchanger (13) and the flash tank (10). The electric heater (11) and the flash tank (10) are each connected to a temperature sensor (5); A pressure sensor (6) is also installed on the pipeline connecting the flash tank (10) and the membrane module (7).

3. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 1, characterized in that, The cold circulation system includes a cold circulation tank (3), a cold circulation pump (34), a cold circulation heat exchanger (35), a cooling water circulation pump (36), and a cooling tower (37). The inlet of the cold circulation tank (3) is connected to the membrane module (7) through a pipeline, and the outlet is connected to the cold circulation pump (34) through a pipeline. The cold circulation pump (34) is connected to the cold circulation heat exchanger (35) through a pipeline. The outlet of the cooling tower (37) is connected to the cooling water circulation pump (36) through a pipeline, and the inlet is connected to the cold circulation heat exchanger (35) through a pipeline. The cooling water circulation pump (36) and the cold circulation heat exchanger (35) are connected through a pipeline. The cold circulation heat exchanger (35) is also connected to the membrane module (7) through a pipeline. A fifth ball valve (1204) and a temperature sensor (5) are also provided on the pipeline between the cold circulation heat exchanger (35) and the membrane module (7). A temperature sensor (5) is also installed on the pipeline connecting the cold circulation tank (3) and the membrane module (7).

4. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 1, characterized in that, A conductivity meter (31) is also installed on the pipeline between the first freshwater discharge pump (30) and the freshwater tank (29), and the freshwater tank (29) is also connected to a second freshwater discharge pump (32).

5. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 1, characterized in that, An explosion-proof electric ball valve (18) is also installed in the pipeline between the concentrate pump (24) and the concentrate tank (27), and a concentrate discharge pump (28) is also connected to the outlet of the concentrate tank (27).

6. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 1, characterized in that, An explosion-proof electric ball valve (18) is also installed in the pipeline between the concentrated water pump (24) and the cleaning water tank (23).

7. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 6, characterized in that, An explosion-proof electric ball valve (18) is also installed in the pipeline between the concentrate pump (24) and the raw water tank (19). The raw water tank (19) is also connected to the membrane module (7) by a pipeline. A seventh ball valve (1206), an eighth ball valve (1207) and a flow meter (15) are installed in sequence on the pipeline between the raw water tank (19) and the membrane module (7). The raw water tank (19) is also connected to a precision filter (17) via a pipeline. An explosion-proof electric ball valve (18) is also installed on the pipeline between the raw water tank (19) and the precision filter (17). A ninth ball valve (1208) is also installed at the inlet end of the precision filter (17).

8. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 7, characterized in that, The seventh ball valve (1206) is also connected to a sixth ball valve (1205), which is connected to the cleaning water tank (23).

9. The advanced treatment device for high-salinity water concentration and volume reduction according to claim 3, characterized in that, It also includes a clean water tank (1) and a clean water pipeline (9); The outlet of the clean water tank (1) is connected to the clean water pipeline (9); The clean water pipeline (9) is connected to the cold circulation tank (3) and the flash tank (10) respectively.

10. A high-salinity water concentration and reduction deep treatment device according to claim 3 or 9, characterized in that, It also includes a vacuum pump (2), which is connected to the cold circulation tank (3), flash tank (10), condenser (21), concentrate tank (25), wetting tank (26) and product water tank (33) via vacuum pipeline (4) to provide negative pressure.

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