A membrane deaeration system with switchable membrane elements

Abstract

The utility model discloses a membrane type oxygen removing system of switchable membrane element belongs to water oxygen removing field, including inlet water tank, security filter, membrane module, instrument assembly, water production tank and water ring vacuum pump, the membrane module is including at least two membrane elements, each membrane element is provided with inlet water valve, water production valve, bypass valve and emptying valve, wherein, the bypass valve is connected between the water inlet end and the water outlet end of membrane element through bypass pipeline, the emptying valve is communicated with the bottom of membrane element through emptying pipeline, the water ring vacuum pump is communicated with the inside of membrane element through first gas pipeline, and high -purity nitrogen source is communicated with the inside of membrane element through second gas pipeline. The membrane type oxygen removing system of switchable membrane element only needs to increase partial pipeline and valve, can realize the flexible switching of membrane element, can solve the problem that multistage membrane element series connection cannot leak detection in membrane type oxygen removing system, and the operation is not enough flexible.

Description

Technical Field

[0001] This utility model relates to the field of water deoxygenation technology, and in particular to a membrane deoxygenation system with switchable membrane elements. Background Technology

[0002] Currently, commonly used water deoxygenation technologies mainly include thermal deoxygenation, vacuum deoxygenation, chemical deoxygenation, and membrane deoxygenation. Thermal deoxygenation consumes a large amount of steam, vacuum deoxygenation requires complex vacuum maintenance devices, and chemical deoxygenation requires the addition of reducing agents to the water. These deoxygenation methods suffer from high investment and operating costs or are not environmentally friendly. Membrane deoxygenation utilizes the hydrophobic properties of the degassing membrane to separate oxygen from the water. Its device is simple, requiring only a booster pump for pressurization, a degassing membrane to separate water and oxygen, a vacuum pump for evacuation, and nitrogen purging to achieve efficient removal of dissolved oxygen.

[0003] A typical membrane deoxygenation process is as follows: influent – ​​security filter – multi-stage membrane elements in series (vacuum + nitrogen purging) – product water. Influent (usually demineralized water) enters the deaeration membrane system after passing through the security filter. After passing through multiple stages of membrane elements in series, oxygen is removed from the water under negative pressure and nitrogen purging. The deoxygenated water is then used in subsequent processes. The purging nitrogen and oxygen removed from the demineralized water are discharged from the system under negative pressure by the water ring vacuum pump.

[0004] However, these multi-stage series membrane elements can only work simultaneously. When membrane leakage occurs, it is impossible to determine which membrane is faulty, and the system can only be stopped and cannot continue to operate. Or, when the operating conditions change, it is impossible to flexibly adjust the number and status of the membrane elements in operation. Utility Model Content

[0005] The purpose of this invention is to solve the problems of leak detection and insufficient operational flexibility in multi-stage membrane elements connected in series in membrane deoxygenation systems, and to propose a membrane deoxygenation system with switchable membrane elements.

[0006] To achieve the above objectives, the present invention employs the following technology: a membrane deoxygenation system with switchable membrane elements, comprising an inlet tank, a security filter, a membrane module, an instrument module, a product water tank, and a water ring vacuum pump;

[0007] The membrane module includes at least two membrane elements, each of which is provided with an inlet valve, a product water valve, a bypass valve, and a drain valve. The bypass valve is connected between the inlet and outlet of the membrane element through a bypass pipeline. The drain valve is connected to the bottom of the membrane element through a drain pipeline. The water ring vacuum pump is connected to the inside of the membrane element through a first gas pipeline. The high-purity nitrogen source is connected to the inside of the membrane element through a second gas pipeline.

[0008] Therefore, the feed tank is connected to the membrane module through the feed pipe on the feed pump, and the deoxygenated water on the membrane element enters the feed tank through the feed pipe on the feed pump.

[0009] As a further description of the above technical solution: several membrane elements in the membrane assembly are connected in series, and each membrane element is detachably connected to the pipeline system via a flange.

[0010] As a further description of the above technical solution: the instrument assembly includes an inlet flow meter located on the pipeline between the inlet tank and the membrane module, and a product flow meter located on the pipeline between the membrane module and the product water tank.

[0011] As a further description of the above technical solution: a security filter is installed on the pipeline between the water inlet pump and the membrane module, a water inlet dissolved oxygen meter is installed on the water outlet side pipeline of the security filter, and a water product dissolved oxygen meter is installed on the water inlet side pipeline of the product water tank.

[0012] As a further description of the above technical solution: each of the membrane elements is provided with an inlet valve on the second gas pipeline, and each of the membrane elements is provided with an outlet valve on the first gas pipeline.

[0013] As a further description of the above technical solution: an organic glass column and a negative pressure gauge are sequentially arranged along the gas flow direction on the first gas pipeline between the membrane element and the water ring vacuum pump.

[0014] As a further description of the above technical solution: the water ring vacuum pump is also connected to a cooling water pipeline.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] Each membrane element is equipped with inlet / outlet valves, bypass valves, and drain valves. When the membrane is not in use, open the drain valve to drain the water, then close the drain valve and the inlet / outlet valves. Open the bypass valve so that incoming water bypasses the membrane. When a membrane element leaks, check which membrane is leaking step by step.

[0017] By simply adding some pipes and valves, flexible switching of membrane elements can be achieved, which has a good effect on membrane leak detection or control of the number and status of operation, and solves the problem of not being able to detect leaks and not being flexible enough in operation of multi-stage membrane elements connected in series in membrane deoxygenation systems. Attached Figure Description

[0018] Figure 1 A schematic diagram of a system according to an embodiment of the present invention is shown.

[0019] Legend:

[0020] 1. Inlet water tank; 2. Inlet water pump; 3. Inlet water flow meter; 4. Security filter; 5. Inlet water dissolved oxygen meter; 6. Inlet water valve; 7. Bypass valve; 8. Drain valve; 9. Product water valve; 10. Membrane element; 11. Product water dissolved oxygen meter; 12. Product water flow meter; 13. Product water tank; 14. Product water pump; 15. Air inlet valve; 16. Air outlet valve; 17. Acrylic glass column; 18. Negative pressure gauge; 19. Water ring vacuum pump. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figure 1 This embodiment provides a membrane deoxygenation system with switchable membrane elements, including an inlet tank 1, a security filter 4, a membrane module, an instrumentation module, a product water tank 13, and a water ring vacuum pump 19. The membrane module includes at least two membrane elements 10, each membrane element 10 being equipped with an inlet valve 6, a product water valve 9, a bypass valve 7, and a drain valve 8. The bypass valve 7 is connected between the inlet and outlet ends of the membrane element 10 via a bypass pipeline, and the drain valve 8 is connected to the bottom of the membrane element 10 via a drain pipeline. The water ring vacuum pump 19... 9 is connected to the inside of the membrane element 10 through the first gas pipeline, and the high-purity nitrogen source is connected to the inside of the membrane element 10 through the second gas pipeline. Therefore, the water inlet tank 1 is connected to the membrane module through the water inlet pipeline on the water inlet pump 2, and the deoxygenated water on the membrane element 10 enters the water inlet tank 13 through the water inlet pipeline on the water inlet pump 14. Several membrane elements 10 in the membrane module are connected in series, and each membrane element 10 is detachably connected to the pipeline system through a flange. The water ring vacuum pump 19 is also connected to a cooling water pipeline.

[0023] In this invention, the number of membrane elements 10 in the membrane module can be selected according to the system requirements. Taking a three-stage membrane deoxygenation system as an example, the water to be deoxygenated is stored in the inlet tank 1. During deoxygenation, the water in the inlet tank 1 enters the interconnected membrane elements 10 under the action of the inlet pump 2. Each membrane element 10 is installed through a flange, which facilitates the replacement and maintenance of the membrane element 10. When one of the membrane elements 10 in the membrane module is not in use, the drain valve 8 is opened to drain the water, and then the drain valve 8, the inlet valve 6, and the product water valve 9 are closed. Then the bypass valve 7 is opened, and the inlet water bypasses the membrane element 10 and enters the next membrane element 10. The product water enters the product water tank 13 and is pumped into the next system by the product water pump 14.

[0024] It should be noted that a security filter 4 is installed on the pipeline between the inlet pump 2 and the membrane module. An inlet dissolved oxygen meter 5 is installed on the outlet side pipeline of the security filter 4, and a product water dissolved oxygen meter 11 is installed on the inlet side pipeline of the product water tank 13. Before the inlet pump 2 sends the water to be deoxygenated in the inlet tank 1 to the membrane element 10, the water to be deoxygenated will be filtered by the security filter 4. The filtered water then enters the membrane element 10. In addition, the inlet dissolved oxygen meter 5 detects the dissolved oxygen in the inlet water, and the product water dissolved oxygen meter 11 detects the dissolved oxygen in the product water. Only after the product water passes the test of the product water dissolved oxygen meter 11 will it enter the product water tank 13.

[0025] Specifically, the instrumentation includes an inlet flow meter 3 located on the pipeline between the inlet tank 1 and the membrane module, and a product water flow meter 12 located on the pipeline between the membrane module and the product water tank 13. The inlet flow meter 3 measures the flow rate of water entering the membrane deoxygenation system. By monitoring the inlet flow rate, it ensures that the amount of water entering the system remains stable within the design range, preventing excessive or insufficient water flow from affecting the deoxygenation effect. The product water flow meter 12 measures the flow rate of water produced after treatment by the membrane deoxygenation system. The product water flow rate is one of the important indicators for measuring the system's processing capacity. By monitoring the product water flow rate, it is possible to understand whether the system's operating efficiency meets the design requirements.

[0026] Specifically, an organic glass column 17 and a negative pressure gauge 18 are sequentially arranged along the gas flow direction on the first gas pipeline between the membrane element 10 and the water ring vacuum pump 19. An inlet valve 15 is provided on the second gas pipeline of each membrane element 10, and an outlet valve 16 is provided on the first gas pipeline of each membrane element 10.

[0027] The removal of dissolved oxygen requires vacuuming and nitrogen purging. The system is equipped with a water ring vacuum pump 19 to extract gas from the membrane element 10. The negative pressure value after the membrane can be read by the negative pressure gauge 18. Each membrane element 10 has an inlet valve 15 and an outlet valve 16 installed in its nitrogen purging pipeline. When the membrane element 10 is not in use, the inlet valve 15 and outlet valve 16 need to be closed. The plexiglass column 17 is made of transparent plexiglass with high light transmittance and is used to observe whether the membrane element is leaking. When the membrane element 10 leaks, it is possible to clearly observe whether there are water droplets seeping out of the membrane element or water stains at the pipeline interface, thus allowing the leaking membrane to be identified step by step.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A membrane deaeration system of switchable membrane elements, characterized in that, It includes an inlet tank (1), a security filter (4), a membrane module, an instrument module, a product water tank (13), and a water ring vacuum pump (19); The membrane module includes at least two membrane elements (10), each membrane element (10) is provided with an inlet valve (6), a product water valve (9), a bypass valve (7) and an empty valve (8), wherein the bypass valve (7) is connected between the inlet and outlet of the membrane element (10) through a bypass pipeline, the empty valve (8) is connected to the bottom of the membrane element (10) through an empty pipeline, the water ring vacuum pump (19) is connected to the inside of the membrane element (10) through a first gas pipeline, and the high-purity nitrogen source is connected to the inside of the membrane element (10) through a second gas pipeline; Therefore, the inlet tank (1) is connected to the membrane module through the inlet pipe on the inlet pump (2), and the deoxygenated water on the membrane element (10) enters the product water tank (13) through the product water pipe on the product water pump (14).

2. A membrane deaeration system of switchable membrane elements according to claim 1, wherein, The membrane elements (10) in the membrane assembly are connected in series, and each membrane element (10) is detachably connected to the pipeline system via a flange.

3. A membrane deaeration system of switchable membrane elements according to claim 2, wherein, The instrumentation assembly includes an inlet flow meter (3) located on the pipeline between the inlet tank (1) and the membrane module, and a product flow meter (12) located on the pipeline between the membrane module and the product tank (13).

4. The membrane deaeration system of claim 3, wherein, A security filter (4) is installed on the pipeline between the water inlet pump (2) and the membrane module. A water inlet dissolved oxygen meter (5) is installed on the water outlet side pipeline of the security filter (4), and a water product dissolved oxygen meter (11) is installed on the water inlet side pipeline of the product water tank (13).

5. The membrane deaeration system of claim 1, wherein, Each membrane element (10) is provided with an inlet valve (15) on its second gas line and an outlet valve (16) on its first gas line.

6. The membrane deaeration system of claim 1, wherein, An organic glass column (17) and a negative pressure gauge (18) are sequentially arranged along the gas flow direction on the first gas pipeline between the membrane element (10) and the water ring vacuum pump (19).

7. The membrane deaeration system of claim 1, wherein, The water ring vacuum pump (19) is also connected to a cooling water pipeline.

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