A steam-heated seawater desalination reverse osmosis chemical cleaning device

Abstract

This application relates to a steam-heated seawater desalination reverse osmosis chemical cleaning device, comprising: a heating water tank, which is connected to an acid washing water tank and an alkaline washing water tank via pipes, and both the acid washing water tank and the alkaline washing water tank are connected to an acid washing water pump and an alkaline washing water pump via pipes; a security filter, the inlet of which is connected to the outlet of the acid washing water pump and the alkaline washing water pump via pipes, the security filter being connected to a seawater reverse osmosis device via pipes, and the outlet of the seawater reverse osmosis device being connected to the acid washing water tank and the alkaline washing water tank via pipes. The device provided in this application has a simple overall structure, a high degree of automation, and allows the heating and cleaning processes to be performed simultaneously, which can greatly shorten the heating time of the cleaning solution, improve cleaning efficiency, and avoid the corrosion problems of traditional electric heaters caused by acids, alkalis, and other chemical agents, as well as seawater.

Description

Technical Field

[0001] This application relates to the field of seawater desalination, and more particularly to a steam-heated reverse osmosis chemical cleaning device for seawater desalination. Background Technology

[0002] my country is a country with scarce water resources, and water scarcity is one of the bottlenecks restricting its development. More than 300 of the 657 cities in the country are short of water, 46 of the 52 coastal cities are short of water, and 13 of the 14 island counties are extremely short of water. Coastal cities such as Tianjin, Dalian, Qingdao, Shanghai, and Shenzhen are all water-scarce areas.

[0003] Seawater desalination is an important way to solve the water shortage in coastal areas, and it is also an important supplement and strategic reserve of my country's water resources.

[0004] Reverse osmosis membranes are synthetic semi-permeable membranes with specific properties and are the core component of reverse osmosis technology. The surface pores of reverse osmosis membranes are very small (0.5–100 nm), effectively removing pollutants such as microorganisms, salts, colloids, and organic matter from water, thus purifying the water. Seawater reverse osmosis involves forcibly pressurizing seawater to force freshwater through the membrane to the other side, thereby achieving seawater desalination. It features low investment, low energy consumption (no phase change), short construction period, and small footprint, making it the fastest-growing seawater desalination technology in the past two decades. The equipment technology supporting reverse osmosis processes is mature and reliable.

[0005] During the operation of a seawater reverse osmosis system, membrane elements inevitably become fouled. The contaminants on membrane elements mainly fall into three categories: organic matter, inorganic matter, and microorganisms. Chemical cleaning can effectively improve various performance parameters of reverse osmosis membrane elements, restoring fouled membrane elements to a higher level. To achieve good cleaning results, the cleaning solution needs to be heated to 25-30℃ before chemical cleaning. Therefore, we propose a steam-heated chemical cleaning device for seawater desalination reverse osmosis. Summary of the Invention

[0006] This application provides a steam-heated chemical cleaning device for seawater desalination reverse osmosis to solve the problem of inevitable fouling of membrane elements during the operation of seawater reverse osmosis systems.

[0007] This application provides a steam-heated seawater desalination reverse osmosis chemical cleaning device, comprising:

[0008] A heating water tank is connected to an acid washing water tank and an alkaline washing water tank via pipes, and both the acid washing water tank and the alkaline washing water tank are connected to an acid washing water pump and an alkaline washing water pump via pipes.

[0009] A security filter is provided, with its inlet connected to the outlets of an acid wash water pump and an alkaline wash water pump via pipes. The security filter is also connected to a seawater reverse osmosis unit via pipes, and the outlet of the seawater reverse osmosis unit is connected to an acid wash water tank and an alkaline wash water tank via pipes.

[0010] Preferably, the interior of the heating water tank is equipped with multiple steam heating coils, and the upper end of the heating water tank is connected to a low-pressure steam device and a water supply device through two pipes respectively.

[0011] Preferably, the steam heating coil includes a frame tube, straight pipes, a jet nozzle, and a main gas supply pipe. The frame tube is rectangular, and multiple straight pipes are fixedly connected at equal intervals inside the frame tube. The main gas supply pipe is fixedly connected to the upper left side of the frame tube.

[0012] Preferably, the lower end of the frame tube is fixedly connected with jet nozzles at equal and uniform intervals, and the lower left and right sides of the straight pipe are fixedly connected with jet nozzles at equal intervals. The main gas supply pipe is inserted into the upper side of the heating water tank, and the gas supply pipe inlet is connected to the outlet of the low-pressure steam device.

[0013] Preferably, the upper parts of the acid washing tank and the alkaline washing tank are respectively connected to the hydrochloric acid dosing device and the NaOH dosing device via pipes.

[0014] Preferably, the heating water tank is provided with a water inlet, a steam inlet, a water outlet, an overflow outlet, a breather outlet, a vent outlet, a thermometer outlet, a temperature sensor interface, and a level gauge interface.

[0015] Preferably, the pickling tank is provided with an inlet, an outlet, a vent, an overflow outlet, a vent, an acid dosing outlet, a non-oxidizing bactericide dosing outlet, a cleaning water pump outlet return outlet, a dilute cleaning side return outlet, a concentrated cleaning side return outlet, a thermometer port, a temperature sensor interface, and a level gauge interface.

[0016] Preferably, the alkaline washing water tank is provided with an inlet, an outlet, an overflow outlet, a breather, a vent, an alkali dosing outlet, a cleaning water pump outlet return outlet, a dilute side return outlet, a concentrated side return outlet, a thermometer port, a temperature sensor interface, and a level gauge interface.

[0017] Preferably, the non-oxidizing bactericide dosing port is connected to an external non-oxidizing bactericide supply device via a pipeline.

[0018] Preferably, the upper ends of the heating water tank, the acid washing water tank, and the alkaline washing water tank are all fixedly connected to guardrails, and a straight ladder is connected to the outside of the guardrails.

[0019] The technical solutions provided in this application have the following advantages compared with the prior art:

[0020] The device provided in this application eliminates the need for electric heaters in the acid washing tank and alkali washing tank to heat the cleaning solution. Instead, heating is achieved through direct heat exchange between steam and water via a heating tank and a steam heating coil. Hot water flows into the acid washing tank and alkali washing tank by gravity. After adding acidic or alkaline chemicals, the cleaning solution is prepared. The cleaning solution is repeatedly circulated and soaked through the cleaning tank, cleaning pump, security filter, and seawater reverse osmosis device to complete the chemical cleaning process of the seawater desalination device. This invention has a simple structure, high degree of automation, and the heating and cleaning processes can be performed simultaneously, which can greatly shorten the heating time of the cleaning solution, improve cleaning efficiency, and avoid the corrosion problems of traditional electric heaters caused by acidic or alkaline chemicals and seawater. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The overall structure of a steam-heated seawater desalination reverse osmosis chemical cleaning device is provided in the embodiments of this application;

[0024] Figure 2 A schematic diagram of the overall structure of the steam heating coil of a steam-heated seawater desalination reverse osmosis chemical cleaning device provided in this application embodiment;

[0025] Figure 3 A cross-sectional view of the frame tube of a steam-heated seawater desalination reverse osmosis chemical cleaning device provided in an embodiment of this application;

[0026] Figure 4 A straight pipe cross-sectional view of a steam-heated seawater desalination reverse osmosis chemical cleaning device provided in an embodiment of this application;

[0027] Figure 5 A top view of the heating water tank of a steam-heated seawater desalination reverse osmosis chemical cleaning device provided in this application embodiment;

[0028] Figure 6 This is a front view of the heating water tank of a steam-heated seawater desalination reverse osmosis chemical cleaning device provided in an embodiment of this application.

[0029] In the diagram: 1. Heating water tank; 11. Acid dosing port; 12. Alkali dosing port; 13. Cleaning water pump outlet return port; 14. Cleaning dilute side return port; 15. Cleaning concentrated side return port; 16. Inlet; 17. Breather port; 18. Outlet; 19. Overflow port; 110. Vent port; 111. Level gauge interface; 112. Thermometer port; 113. Temperature sensor interface; 114. Steam inlet; 115. Guardrail; 116. Straight ladder; 2. Acid washing water tank; 3. Alkali washing water tank; 4. Acid washing water pump; 5. Alkali washing water pump; 6. Security filter; 7. Seawater reverse osmosis unit; 8. Steam heating coil; 81. Frame pipe; 82. Straight pipe; 83. Jet nozzle; 84. Main gas supply pipe; Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Various embodiments of this application may exist in the form of a range. It should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of this application. Therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated in this application, it means including any referenced number (fraction or integer) within the indicated range. Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in this application can be purchased commercially or prepared by existing methods.

[0032] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in this application, the terms "comprising," "including," etc., mean "including but not limited to." In this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this application, "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this application, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of a single item or a plural item. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0033] like Figures 1 to 6 As shown, this application provides a steam-heated seawater desalination reverse osmosis chemical cleaning device, comprising:

[0034] A heating water tank 1 is connected to an acid washing water tank 2 and an alkaline washing water tank 3 via pipes, and both the acid washing water tank 2 and the alkaline washing water tank 3 are connected to an acid washing water pump 4 and an alkaline washing water pump 5 via pipes.

[0035] Security filter 6, the inlet of which is connected to the outlet of acid wash water pump 4 and alkaline wash water pump 5 via a pipe, the security filter 6 is connected to seawater reverse osmosis device 7 via a pipe, and the outlet of seawater reverse osmosis device 7 is connected to acid wash water tank 2 and alkaline wash water tank 3 via pipes respectively.

[0036] Specifically: Heating water tank 1 is made of 316L stainless steel, with a diameter of φ2200mm, a height of 2650mm, and a volume of 10m³. 3 ;

[0037] Pickling tank 2 is made of fiberglass epoxy resin, with a diameter of φ2200mm, a height of 2650mm, and a volume of 10m³. 3 ;

[0038] Alkaline washing water tank 3 is made of fiberglass epoxy resin, with a diameter of φ2200mm, a height of 2650mm, and a volume of 10m³. 3 ;

[0039] The housings, impellers, and other flow-through components of CIP's acid wash water pump 4 and alkaline wash water pump 5 are made of 316L stainless steel. The security filter 6 is also made of 316L stainless steel, and the filter element is a high-flow filter element with a filtration accuracy of 5µm. CIP's acid wash water pump 4, alkaline wash water pump 5, security filter 6, and seawater reverse osmosis device 7 all use existing technologies available on the market, which will not be elaborated here.

[0040] refer to Figure 1 As shown: The interior of the heating water tank 1 is equipped with multiple steam heating coils 8, and the upper end of the heating water tank 1 is connected to a low-pressure steam device and a water supply device through two pipes respectively.

[0041] refer to Figure 2 As shown: The steam heating coil 8 includes a frame tube 81, straight tubes 82, jet nozzles 83 and a main gas supply pipe 84. The frame tube 81 is rectangular, and multiple straight tubes 82 are fixedly connected at equal intervals inside the frame tube 81. The main gas supply pipe 84 is fixedly connected to the upper left side of the frame tube 81.

[0042] Specifically: the steam heating coil 8 is made of 316L stainless steel and is supplied with low-pressure steam with an absolute pressure of P=0.4MPa. The inlet pipe diameter is DN125. The steam heating coil 8 is fixed at a height of 200mm from the bottom of the heating water tank 1. To ensure that the steam and water are fully mixed, the steam heating coil 8 has symmetrical and staggered holes on both sides at 100mm intervals, and steam jet heads 83 with a diameter of φ20-φ10 are installed on the holes.

[0043] refer to Figure 2 As shown: The lower end of the frame pipe 81 is fixedly connected with jet nozzles 83 at equal and uniform intervals, and the lower left and right sides of the straight pipe 82 are also fixedly connected with jet nozzles 83 at equal intervals. The gas supply main pipe 84 is inserted into the upper side of the heating water tank 1, and the gas supply main pipe 84 is connected to the gas outlet of the low-pressure steam device.

[0044] The jet head 83 is a steam ejection device.

[0045] refer to Figure 1 As shown: The upper parts of the acid washing tank 2 and the alkaline washing tank 3 are respectively connected to the hydrochloric acid dosing device and the NaOH dosing device through pipes.

[0046] refer to Figure 1 , Figure 5 and Figure 6 As shown: The heating water tank 1 is equipped with a water inlet 16, a steam inlet 114, a water outlet 18, an overflow outlet 19, a breather 17, a vent 110, a thermometer port 112, a temperature sensor interface 113, and a level gauge interface 111.

[0047] Specifically: The heating water tank 1 is equipped with a DN100 inlet 16, a DN150 outlet 18, a DN150 overflow outlet 19, a DN150 vent outlet 110, a DN100 steam inlet 114, and two DN50 thermometer ports 112 and magnetic level gauge ports 111. The inlet 16 is equipped with a DN100 electric inlet valve, which is interlocked with the water level of the heating water tank 1. When the water level reaches 1.8m, the electric inlet valve is closed to stop the water intake. The steam inlet 114 is equipped with a DN100 electric steam valve, which is interlocked with the temperature of the heating water tank 1. When the heating temperature reaches 28℃, the electric steam valve is closed to stop the steam intake.

[0048] Steam inlet 114 is connected to an external steam supply device via a pipe, water outlet 18 is the outlet of the heating water tank 1, vent 110 is connected to a vent valve via a pipe, thermometer port 112 is for connecting a thermometer, temperature sensor interface 113 is for connecting a temperature sensor, and level gauge interface 111 is for connecting a level gauge.

[0049] refer to Figure 1 , Figure 5 and Figure 6 As shown: The pickling water tank 2 is equipped with an inlet 16, an outlet 18, a breather 17, an overflow 19, a vent 110, an acid dosing port 11, a non-oxidizing bactericide dosing port, a cleaning water pump outlet return port 13, a cleaning dilute side return port 14, a cleaning concentrated side return port 15, a thermometer port 112, a temperature sensor interface 113, and a level gauge interface 111.

[0050] Specifically: the pickling water tank 2 is equipped with a DN100 inlet 16 connected to the heating water tank 1, a DN150 outlet 18 connected to the pickling water pump 4, a DN25 acid dosing device 11 connected to an external acid dosing device, a DN150 overflow port 19, a DN150 vent port 110, a DN50 thermometer port 112, and a magnetic level gauge interface 111. The inlet 16 is equipped with a DN100 electric inlet valve, which is interlocked with the level of the pickling water tank 2. When the water level reaches 1.8m, the electric inlet valve is closed to stop the water intake. After the heating water tank 1 heats to 28℃, the electric inlet valve of the pickling water tank 2 is opened, and hot water flows into the pickling water tank 2 by gravity.

[0051] The vent 110 is connected to the vent valve via a pipe, the thermometer port 112 is for connecting the thermometer, the temperature sensor interface 113 is for connecting the temperature sensor, and the level gauge interface 111 is for connecting the level gauge.

[0052] refer to Figure 1 , Figure 5 and Figure 6As shown: The alkaline washing water tank 3 is equipped with an inlet 16, an outlet 18, an overflow port 19, a breather port 17, a vent port 110, an alkali dosing port 12, a cleaning water pump outlet return port 13, a cleaning dilute side return port 14, a cleaning concentrated side return port 15, a thermometer port 112, a temperature sensor interface 113, and a level gauge interface 111.

[0053] Specifically: the alkaline washing water tank 3 is equipped with a DN100 inlet 16 connected to the heating water tank 1, a DN150 outlet 18 connected to the alkaline washing water pump, a DN25 alkaline dosing port 12 connected to the alkaline dosing device, a DN150 overflow port 19, a DN150 vent port 110, and two interfaces: a DN50 thermometer port 112 and a magnetic level gauge port 111. The inlet 16 is equipped with a DN100 electric inlet valve, interlocked with the water level in the alkaline washing water tank 3. Water is introduced to a level of 1.8m, then the electric inlet valve is closed to stop the water intake. After the heating water tank 1 heats to 28℃, the electric inlet valve of the alkaline washing water tank 3 is opened, allowing hot water to flow into the alkaline washing water tank 3 by gravity.

[0054] The vent 110 is connected to the vent valve via a pipe, the thermometer port 112 is for connecting the thermometer, the temperature sensor interface 113 is for connecting the temperature sensor, and the level gauge interface 111 is for connecting the level gauge.

[0055] refer to Figure 1 As shown: The non-oxidizing bactericide dosing port is connected to an external non-oxidizing bactericide supply device via a pipeline. The non-oxidizing bactericide supply device adopts existing equipment on the market and adds non-oxidizing bactericide to the inside of the pickling water tank 2.

[0056] refer to Figure 5 As shown: The upper ends of the heating water tank 1, the pickling water tank 2 and the alkaline washing water tank 3 are all fixedly connected with guardrails 115, and a straight ladder 116 is connected to the outside of the guardrails 115.

[0057] During the cleaning process, hot water is added to the pickling tank 2 until the liquid level reaches 1.8m. Then, the external acid dosing device is activated to inject acid into the pickling tank 2, and a pickling solution with pH=2 is prepared. The CIP pickling water pump 4 and the electric pickling valve are then activated. The pickling cleaning solution is circulated back to the pickling tank 2 through the security filter 6 and the seawater reverse osmosis device 7. After repeated circulation and soaking, the chemical cleaning pickling process is completed. The electric vent valve of the pickling tank 2 is then opened to drain the cleaning solution.

[0058] After adding hot water to the alkaline washing tank 3 to a level of 1.8m, start the alkaline dosing device to inject alkaline solution into the alkaline washing tank 3, prepare an alkaline washing solution with pH=12, start the CIP alkaline washing water pump 5 and the alkaline washing electric valve, and the alkaline washing solution will circulate back to the alkaline washing tank through the security filter 6 and the seawater reverse osmosis device 7. After repeated circulation and soaking, the chemical cleaning alkaline washing process is completed. Open the electric vent valve of the alkaline washing tank 3 to drain the cleaning solution.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed in this application.

Claims

1. A steam heating based reverse osmosis chemical cleaning device for sea water desalination characterized in that, The application relates to a seawater cleaning device. The seawater cleaning device comprises a heating water tank (1) connected with an acid washing water tank (2) and an alkali washing water tank (3) through pipelines respectively, and the acid washing water tank (2) and the alkali washing water tank (3) are connected with an acid washing water pump (4) and an alkali washing water pump (5) through pipelines respectively; A security filter (6) is connected with the outlet of the acid washing water pump (4) and the alkali washing water pump (5) through a pipeline, and the security filter (6) is connected with a seawater reverse osmosis device (7) through a pipeline; the outlet of the seawater reverse osmosis device (7) is connected with the acid washing water tank (2) and the alkali washing water tank (3) through pipelines respectively; A plurality of steam heating coils (8) are arranged in the heating water tank (1), and the upper end of the heating water tank (1) is connected with a low-pressure steam device and a water supplement device through two pipelines respectively; The steam heating coil (8) comprises a frame pipe (81), a straight pipe (82), a jet head (83) and a gas supply main pipe (84); the frame pipe (81) is in a rectangular shape, and a plurality of straight pipes (82) are fixedly connected to the frame pipe (81) at equal intervals; the upper end of the frame pipe (81) is fixedly connected with the gas supply main pipe (84) on the left side; The lower end of the frame pipe (81) is fixedly connected with the jet head (83) at equal intervals, and the lower part of the straight pipe (82) is fixedly connected with the jet head (83) on the left and right sides at equal intervals; the gas supply main pipe (84) is inserted into the upper side of the heating water tank (1), and the gas inlet of the gas supply main pipe (84) is connected with the gas outlet of the low-pressure steam device; The upper part of the acid washing water tank (2) and the alkali washing water tank (3) is connected with a hydrochloric acid dosing device and a NaOH dosing device through pipelines respectively.

2. A steam-based chemical cleaning device for reverse osmosis of seawater desalination as claimed in claim 1, wherein: The heating water tank (1) is provided with a water inlet (16), a steam inlet (114), a water outlet (18), an overflow port (19), a breathing port (17), a vent port (110), a thermometer port (112), a temperature sensor interface (113) and a liquid level meter interface (111).

3. A steam-based chemical cleaning device for reverse osmosis of seawater desalination as claimed in claim 1, wherein: The acid washing water tank (2) is provided with a water inlet (16), a water outlet (18), a breathing port (17), an overflow port (19), a vent port (110), an acid dosing port (11), a non-oxidizing bactericide dosing port, a cleaning water pump outlet backflow port (13), a cleaning dilute side backflow port (14), a cleaning concentrated side backflow port (15), a thermometer port (112), a temperature sensor interface (113) and a liquid level meter interface (111).

4. A steam-based chemical cleaning apparatus for reverse osmosis of seawater desalination as claimed in claim 3, wherein: The non-oxidizing bactericide dosing port is connected with an external non-oxidizing bactericide liquid supply device through a pipeline.

5. A steam-based chemical cleaning device for reverse osmosis of sea water desalination as claimed in claim 1, wherein: The alkali washing water tank (3) is provided with a water inlet (16), a water outlet (18), an overflow port (19), a breathing port (17), a vent port (110), an alkali dosing port (12), a cleaning water pump outlet backflow port (13), a cleaning dilute side backflow port (14), a cleaning concentrated side backflow port (15), a thermometer port (112), a temperature sensor interface (113) and a liquid level meter interface (111).

6. A steam-based chemical cleaning device for reverse osmosis of sea water desalination as claimed in claim 1, wherein: The upper end of the heating water tank (1), the acid washing water tank (2) and the alkali washing water tank (3) is fixedly connected with a guardrail (115), and the outer side of the guardrail (115) is connected with a straight ladder (116).

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