Gas flushing structure of membrane module and nanofiltration reverse osmosis device

Abstract

The utility model discloses a gas flushing structure of a membrane module, aiming at overcoming the defects that the existing nanofiltration reverse osmosis system is serious in deposition and difficult to flush and clean. The device comprises a pressurizing part, a part to be cleaned and a gas supply part which are connected through pipelines, the pressurizing part can pressurize water to be washed, the gas supply part can inflate the water to be washed to form a water-gas mixture, the water-gas mixture washes permeable membrane elements, the part to be cleaned comprises a plurality of sections of membrane elements, and the gas supply part comprises a plurality of gas supply devices. And the air supply equipment is adjustably connected with the water inlet pipeline of the membrane element through the switch valve, so that the flushing efficiency and the cleanliness of the membrane cleaning system are improved.

Description

Technical Field

[0001] The utility model relates to the field of water treatment, and more specifically, to an air flushing structure of a membrane component and a nanofiltration reverse osmosis device. Background Art

[0002] Membrane water treatment technology is used in various water treatment applications, offering advantages such as ease of operation and economical operation. However, some projects are impacted by complex water source composition, fluctuating water quality, inappropriate process design, and limited operator experience. While membrane systems can operate, they are in a sub-healthy state. These system issues increase operating costs and pose risks to safe and stable operation.

[0003] A system operating in a sub-healthy state can lead to worsening health problems, significantly increase operating costs, and pose significant risks to safe and stable operation. These problems and risks are a source of frustration for many owners, yet solutions remain difficult to find.

[0004] One cause of this problem is the complex influent quality of nanofiltration or reverse osmosis systems. Organic matter and inorganic salts are continuously concentrated by the membrane system, easily depositing on the membrane surface. However, to meet production needs, owners struggle to maintain long-term system downtime for flushing. Often, chemical cleaning is required to restore the system when significant deposits become severe. However, in some projects, conventional chemical cleaning is difficult to use due to complex water sources, poor water quality, inadequate pretreatment, or problematic pharmaceutical product quality. This situation is particularly acute in reclaimed water reuse, zero-emission, and concentrate reverse osmosis projects.

[0005] Related reports have suggested that hydraulic flushing be carried out by shutting down the system, but actual use has proven that the effect is poor. Summary of the Invention

[0006] The utility model overcomes the shortcomings of existing nanofiltration reverse osmosis systems that are serious in deposition and difficult to flush and remove, and provides an air flushing structure for a membrane assembly and a nanofiltration reverse osmosis device, which can improve flushing efficiency and enhance the cleanliness of the membrane system.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A gas flushing structure for a membrane assembly includes a pressurizing portion, a portion to be cleaned, and an air supply portion connected by pipelines. The pressurizing portion can pressurize the water to be cleaned, and the air supply portion can inflate the flushing water to form a water-gas mixture. The water-gas mixture flushes the permeable membrane element. The portion to be cleaned includes several sections of membrane elements, and the air supply portion includes several air supply devices, which are respectively connected to the water inlet pipeline of the membrane assembly.

[0009] The pressurization unit is used to pressurize the flushing water, allowing it to enter the high-osmotic-pressure side of the membrane assembly in a positive flushing manner. The air supply device in the air supply unit is activated to aerate the flushing water, forming an air-water mixture. Because the air supply device is connected to the water inlet pipe and the relatively narrow diameter of the water inlet pipe, the high pressure allows the air and water to mix thoroughly, flushing away deposits from the membrane surface. Compared to flushing with water, this air-water mixture improves flushing efficiency and enhances the cleanliness of the membrane system.

[0010] Preferably, the portion to be cleaned comprises two membrane elements, and the pipeline comprises two branch pipes connected to the air supply device, the two branch pipes being connected to the water inlet pipes of the two membrane assemblies respectively. This structure enables the cleaning of the two membrane assemblies at the same time.

[0011] Preferably, the two branch pipes are respectively provided with automatic valves for controlling the on-off of the branch pipes. This structure enables the air flushing structure to also support the flushing of the two membrane modules in sequence.

[0012] Preferably, the pressurizing unit is a flushing pump.

[0013] Preferably, the air supply equipment includes an air compressor.

[0014] Preferably, the flushing water contains a cleaning agent to improve the ability to remove deposits.

[0015] A nanofiltration reverse osmosis device comprises a booster part, an air flushing structure of a membrane assembly, and a concentrated water pipeline and a produced water pipeline connected to the membrane assembly, which are sequentially connected in series. A check valve is provided between the booster part and the part to be cleaned.

[0016] The pressure-boosting section, consisting of a booster pump and a high-pressure pump connected in series, boosts the pretreatment system's produced water pressure before feeding it into the membrane assembly. This pressure allows the water to overcome the membrane's osmotic pressure and enter the low-osmotic-pressure side. This process traps organic matter and inorganic salts on the high-osmotic-pressure side. The air flushing mechanism is connected to the nanofiltration reverse osmosis unit via piping and a check valve. When the booster pump in the air flushing mechanism provides pressure, the check valve restricts backflow.

[0017] Preferably, the concentrate pipe for the front-end membrane assembly is switchably connected to a first branch pipe and a second branch pipe. The first branch pipe is used to discharge flush water, and the second branch pipe is connected to the water inlet pipe of the rear-end membrane assembly. This structure provides two branches for flush water discharge and connection to the rear-end membrane assembly, and automatic valves are installed on the first branch pipe and the second branch pipe to manage the flow.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) Through the fully mixed gas-liquid mixture, it has better stripping ability and improves the cleaning efficiency of the deposits on the membrane system;

[0020] (2) Using water-gas mixture to flush, the cleaning efficiency is high and the water loss is relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a nanofiltration reverse osmosis device;

[0022] In the picture:

[0023] Flushing pump 1, air compressor 2, branch pipe 3, membrane element 4, booster pump 5, high-pressure pump 6, automatic valve 7, concentrated water pipeline 8, produced water pipeline 9, check valve 10, first branch pipe 11, second branch pipe 12. DETAILED DESCRIPTION

[0024] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Example:

[0028] Ginseng Figure 1 As shown, an air flushing structure of a membrane module, wherein the air flushing structure is represented by a dotted line and includes a pressurizing part, a part to be cleaned and an air supply part connected by pipelines.

[0029] The pressurizing unit pressurizes the flushing water, while the air supply unit aerates the flushing water to form a water-air mixture. This water-air mixture flushes the permeable membrane element 4. The section to be cleaned comprises several membrane elements 4, and the air supply unit comprises several air supply devices, each connected to the water inlet pipe of the membrane assembly. The pressurizing unit comprises a flushing pump 1. The air supply device comprises an air compressor 2. The flushing water contains a cleaning agent.

[0030] The section to be cleaned includes two membrane elements 4. The pipeline includes two branch pipes 3 connected to the air supply equipment. The two branch pipes 3 are connected to the water inlet pipes of the two membrane modules. This structure supports the simultaneous cleaning of both membrane modules. The two branch pipes 3 are each equipped with an automatic valve 7 to control the opening and closing of the branch pipes 3. This structure also enables the air flushing system to flush the two membrane modules in sequence.

[0031] The pressurization unit is used to pressurize the flushing water, allowing it to enter the high-osmotic-pressure side of the membrane assembly in a positive flushing manner. The air supply device in the air supply unit is activated to aerate the flushing water, forming an air-water mixture. Because the air supply device is connected to the water inlet pipe and the relatively narrow diameter of the water inlet pipe, the high pressure allows the air and water to mix thoroughly, flushing away deposits from the membrane surface. Compared to flushing with water, this air-water mixture improves flushing efficiency and enhances the cleanliness of the membrane system.

[0032] Based on the aforementioned air flushing structure, a nanofiltration reverse osmosis device is provided. It comprises a pressure-boosting unit, a membrane assembly air flushing structure, and a concentrate pipe 8 and a product water pipe 9 connected to the membrane assembly in series. A check valve 10 is provided between the pressure-boosting unit and the section to be cleaned. The concentrate pipe 8 of the leading membrane assembly is switchably connected to a first branch pipe 11 and a second branch pipe 12. The first branch pipe 11 is used to discharge flushing water, while the second branch pipe 12 connects to the water inlet pipe of the trailing membrane assembly. This structure provides two branch pipes for flushing water discharge and connection to the trailing membrane assembly. Automatic valves 7 are provided on each of the first branch pipe 11 and the second branch pipe 12 to manage the pipe connectivity.

[0033] The boosting unit includes a boost pump 5 and a high-pressure pump 6 connected in series.

[0034] The automatic valve 7 includes a pneumatic valve, an electric valve or a solenoid valve.

[0035] The pressure-boosting unit, consisting of a booster pump 5 and a high-pressure pump 6 connected in series, boosts the pressure of the pretreatment system's produced water and feeds it into the membrane assembly. This pressure allows the water to overcome the membrane's osmotic pressure and enter the low-osmotic-pressure side. This process traps organic matter and inorganic salts on the high-osmotic-pressure side. The air flushing mechanism is connected to the nanofiltration reverse osmosis device via piping and a check valve 10. When the pressure pump in the air flushing mechanism provides pressure, the liquid is restricted by the check valve 10, preventing reverse flow.

[0036] The above-described embodiments are only preferred solutions of the present invention and do not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A gas flushing structure for a membrane module, characterized in that: It includes a pressurizing part, a part to be cleaned and an air supply part connected by pipelines. The pressurizing part can pressurize the water to be cleaned, and the air supply part can inflate the flushing water to form a water-gas mixture. The water-gas mixture flushes the permeable membrane element. The part to be cleaned includes several sections of membrane elements, and the air supply part includes several air supply equipment. The air supply equipment is respectively connected to the water inlet pipe of the membrane component.

2. The air flushing structure of a membrane module according to claim 1, characterized in that: The portion to be cleaned includes two sections of membrane components. The pipeline includes two branch pipes connected to the air supply equipment, and the two branch pipes are respectively connected to the water inlet pipes of the two sections of membrane components.

3. The air flushing structure of a membrane module according to claim 2, characterized in that: The two branch pipes are respectively provided with automatic valves for controlling the on and off of the branch pipes.

4. The air flushing structure of a membrane module according to claim 1, characterized in that: The pressurizing part is a flushing pump.

5. The air flushing structure of a membrane module according to claim 1, characterized in that: Air supply equipment includes air compressor.

6. The air flushing structure of a membrane module according to claim 1, characterized in that: The flushing water contains cleaning agents.

7. A nanofiltration reverse osmosis device, characterized in that: It comprises a boosting part connected in series, an air flushing structure of the membrane assembly according to any one of claims 1 to 5, and a concentrated water pipeline and a produced water pipeline connected to the membrane assembly, and a check valve is provided between the boosting part and the part to be cleaned.

8. A nanofiltration reverse osmosis device according to claim 7, characterized in that: The concentrated water pipeline of the front membrane assembly is switched to be connected with a first branch pipe and a second branch pipe. The first branch pipe is used to discharge flushing water, and the second branch pipe is connected to the water inlet pipeline of the rear membrane assembly.

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