Water filtration system

Abstract

The present application provides a water filtration system, which includes a first filter and an air intake module. The first filter includes a first housing and a filter element. A first cavity is provided in the first housing. An air inlet and a drain are provided on the first housing. Both the air inlet and the drain are connected to the first cavity. The filter element is provided in the first cavity, and the drain is arranged opposite to the filter element. The air intake module is connected to the air intake. The air intake module applies air pressure to the first filter through the air intake. Under the push of the air pressure, the water in the first cavity flows in the reverse direction through the filter element. Under the impact of the reverse flow of water, impurities attached to the surface of the filter element are peeled off and discharged from the drain with the water flow. When the filter element of the water filtration system is clogged with impurities, there is no need to spend a lot of time and manpower to replace the filter element. It is only necessary to apply air pressure to the first filter through the air intake, thereby saving time and manpower, reducing the cost of using the water filtration system, and solving the problem of high cost of using the water filtration system in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power plants, and in particular to a water filtration system. Background Art

[0002] The water filtration system is an important part of the nuclear island system of a nuclear power plant. Its function is to remove impurities such as solid corrosion products and fission products generated during the operation of the nuclear island reactor of the nuclear power plant in the water to meet the water quality requirements of the nuclear island system of the nuclear power plant and maintain the normal operation of the equipment.

[0003] In the prior art, the water filtration system of the nuclear island system of a nuclear power plant is a one-way filtration structure without a backwash function. When the filter element of the water filtration system is clogged with impurities, the operation of the nuclear island system of the nuclear power plant needs to be stopped, and a lot of time and manpower are spent on replacing the filter element. Moreover, the replaced old filter element cannot be reused. In other words, the water filtration system in the prior art has a high cost of use.

[0004] Application Contents

[0005] The embodiment of the present application provides a water filtration system, which solves the problem of high usage cost of water filtration systems in the prior art.

[0006] To achieve the above-mentioned purpose, an embodiment of the present application provides a water filtration system, which includes a first filter and an air intake module. The first filter includes a first shell and a filter element. A first cavity is provided in the first shell. An air inlet and a drain port are provided on the first shell. Both the air inlet and the drain port are connected to the first cavity. The filter element is provided in the first cavity. The drain port is arranged opposite to the filter element. The air intake module is connected to the air inlet. The air intake module applies air pressure to the first filter through the air inlet.

[0007] Optionally, the water filtration system also includes a differential pressure transmitter, and the first shell is also provided with a water inlet and a water outlet, the water inlet and the water outlet are both connected to the first cavity, and the water inlet is connected to the first end of the differential pressure transmitter, and the water outlet is connected to the second end of the differential pressure transmitter.

[0008] Optionally, the water filtration system also includes a buffer, which includes a second shell, a second cavity is provided in the second shell, a first opening and a second opening are provided on the second shell, the first opening and the second opening are both connected to the second cavity, and the first opening is connected to the drain outlet.

[0009] Optionally, the water filtration system further includes an exhaust module, and the second shell is further provided with a third opening, and the third opening is respectively connected to the second cavity and the exhaust module.

[0010] Optionally, the water filtration system further includes a first check valve and a second check valve, the air intake module is connected to the air inlet through the first check valve, and the third opening is connected to the exhaust module through the second check valve.

[0011] Optionally, the water filtration system further includes a water inlet module, a water outlet module, and a bypass pipeline;

[0012] The water inlet module is connected to the water inlet, and the water outlet module is connected to the water outlet;

[0013] The first end of the bypass line is communicated with the water inlet, and the second end of the bypass line is communicated with the water outlet.

[0014] Optionally, the water filtration system further includes a second filter, and the first end of the bypass line is connected to the water inlet through the second filter.

[0015] Optionally, the water filtration system further includes a detection component, the detection component includes a first detection member, and the first detection member is provided at the water inlet.

[0016] Optionally, the water filtration system further includes a valve assembly, the valve assembly including a first valve and a second valve, the water inlet module is connected to the water inlet through the first valve, and the water outlet module is connected to the water outlet through the second valve.

[0017] In an embodiment of the present application, a water filtration system includes a first filter and an air intake module. The first filter includes a first housing and a filter element. The first housing is provided with a first cavity. The first housing is provided with an air inlet and a drain outlet. Both the air inlet and the drain outlet are connected to the first cavity. The filter element is provided in the first cavity, and the drain outlet is arranged opposite to the filter element. The air intake module is connected to the air intake. The air intake module applies air pressure to the first filter through the air intake. Under the influence of the air pressure, water in the first cavity flows in the reverse direction through the filter element. Under the impact of the reverse flow of water, impurities attached to the surface of the filter element are peeled off and discharged from the drain outlet along with the water flow. When the filter element of the water filtration system is clogged with impurities, there is no need to spend a lot of time and manpower to replace the filter element. The air intake module only needs to apply air pressure to the first filter through the air intake to clean the impurities on the filter element, allowing it to continue to be used. This saves time and manpower, reduces the cost of using the water filtration system, and solves the problem of high cost of using water filtration systems in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following description is given of the drawings in the specification. Obviously, the following drawings are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the listed drawings without paying any creative work.

[0019] Figure 1 It is a structural diagram of the water filtration system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] See also Figure 1 , an embodiment of the present application provides a water filtration system, which includes a first filter 100 and an air intake module 200, the first filter 100 includes a first shell and a filter element, a first cavity is provided in the first shell, an air inlet 101 and a drain port 102 are provided on the first shell, the air inlet 101 and the drain port 102 are both connected to the first cavity, the filter element is provided in the first cavity, the drain port 102 is arranged opposite to the filter element, the air intake module 200 is connected to the air inlet 101, and the air intake module 200 applies air pressure to the first filter 100 through the air inlet 101.

[0022] Specifically, the shape of the first shell can be an ellipsoid, a rectangular parallelepiped, etc., and the material of the first shell can be stainless steel. The material of the filter element can be high-strength stainless steel, and the filter element can be composed of a stacked stainless steel filter mesh. A support can be provided in the first cavity to fix the filter element in the first cavity. The air inlet 101 can be provided at the top of the first shell, and the air inlet 101 is connected to the air intake module 200 through a pipeline. The pipeline can be a hollow cylinder made of stainless steel. The air inlet 101 and the air intake module 200 can both be connected to the port of the pipeline by welding, and the air intake module 200 can be a compressed air system of a nuclear power plant. The drain outlet 102 can be provided at the bottom of the first shell to make drainage more sufficient, and the drain outlet 102 is connected to the nuclear island wastewater treatment and discharge system of the nuclear power plant through a pipeline.

[0023] It should be noted that the design of the water filtration system should meet the requirements of the "Rules for the Design and Construction of Mechanical Equipment of Pressurized Water Reactor Nuclear Island" (RCC-M Code).

[0024] In the embodiment of the present application, the air intake module is connected to the air inlet. The air intake module applies air pressure to the first filter through the air inlet. Driven by the air pressure, the water in the first cavity flows in the reverse direction through the filter element. Under the impact of the reverse flow of water, impurities attached to the surface of the filter element are peeled off and discharged from the drain outlet along with the water flow. When the filter element of the water filtration system is clogged with impurities, there is no need to spend a lot of time and manpower to replace the filter element. The air intake module only needs to apply air pressure to the first filter through the air inlet to clean the impurities on the filter element, allowing it to continue to be used. This saves time and manpower, reduces the cost of using the water filtration system, and solves the problem of high cost of using water filtration systems in the prior art.

[0025] Optional, such as Figure 1 As shown, the water filtration system also includes a differential pressure transmitter 501, and the first shell is also provided with a water inlet 103 and a water outlet 104, the water inlet 103 and the water outlet 104 are both connected to the first cavity, and the water inlet 103 is connected to the first end of the differential pressure transmitter 501, and the water outlet 104 is connected to the second end of the differential pressure transmitter 501.

[0026] Specifically, the water inlet 103 is connected to the first end of the differential pressure transmitter 501 via a pipeline, and the water outlet 104 is connected to the second end of the differential pressure transmitter 501 via a pipeline. Valves can be installed on both pipelines near the first and second ends of the differential pressure transmitter. The differential pressure transmitter 501 is used to measure the liquid level, flow rate, and pressure, and then converts them into a 4-20 mA DC signal output. Purified water flows into the water inlet 103, passes through the filter element of the first filter 100, and flows out of the water outlet 104. As the filtration process continues, impurities accumulate on the surface of the filter element and gradually increase in thickness. As a result, the pressure difference between the water inlet 103 and the water outlet 104 of the first filter 100 increases. When the pressure exceeds a preset value (the preset value can be 0.25 MPa, which can vary depending on the system), the differential pressure transmitter 501 issues a corresponding indication signal, indicating that the filter element of the first filter 100 is clogged beyond an acceptable level, and the air intake module 200 is activated to perform a backwash to clean the filter element.

[0027] Optional, such as Figure 1 As shown, the water filtration system also includes a buffer 300, and the buffer 300 includes a second shell, a second cavity is provided in the second shell, and a first opening 301 and a second opening 302 are provided on the second shell, the first opening 301 and the second opening 302 are both connected to the second cavity, and the first opening 301 is connected to the drain outlet 102.

[0028] Specifically, the buffer 300 can be a hollow ellipsoid made of stainless steel. The reverse-flowing water under the action of air pressure is discharged after being transitionally decelerated through the buffer 300, which can reduce the impact of high-speed water flow on the nuclear island wastewater treatment and discharge system of the nuclear power plant.

[0029] Optional, such as Figure 1 As shown, the water filtration system further includes an exhaust module 400 , and a third opening 303 is further provided on the second shell. The third opening 303 is communicated with the second cavity and the exhaust module 400 respectively.

[0030] Specifically, the exhaust module 400 can be a nuclear island gas processing and exhaust system of a nuclear power plant. The third opening 303 is provided on the top of the second shell. The third opening 303 is connected to the exhaust module 400 through a pipeline to discharge the exhaust gas in the first cavity and the second cavity.

[0031] Optionally, the water filtration system further includes a first check valve 201 and a second check valve 401 , the air intake module 200 is connected to the air inlet 101 through the first check valve 201 , and the third opening 303 is connected to the exhaust module 400 through the second check valve 401 .

[0032] A check valve is a valve with a circular flap that operates by its own weight and the pressure of the medium to block the backflow of the medium, thus preventing the backflow of water. A first check valve 201 is installed on the pipeline connecting the intake module 200 and the air inlet 101 to prevent gas flowing into the first filter 100 from flowing back into the intake module 200 and affecting the cleaning effect of the first filter 100. A second check valve 401 is installed on the pipeline connecting the third opening 303 and the exhaust module 400 to prevent exhaust gas from flowing back into the buffer 300 through the pipeline and affecting the exhaust effect.

[0033] Optionally, the water filtration system also includes a water inlet module 500 and a water outlet module 600, a bypass pipeline 502, the water inlet module 500 is connected to the water inlet 103, the water outlet module 600 is connected to the water outlet 104, the first end of the bypass pipeline 502 is connected to the water inlet 103, and the second end of the bypass pipeline 502 is connected to the water outlet 104.

[0034] The water inlet module 500 is connected to the water inlet 103 via a pipeline, and the water outlet module 600 is connected to the water outlet 104 via a pipeline. The water inlet module 500 provides purified water, which flows through the water inlet 103 into the first filter 100 for filtration. The filtered water then flows out of the water outlet 104 and into the water outlet module 600, where it is delivered to the water demand system requiring filtered water. A third valve 505 is provided on the bypass line 502. This valve is closed during normal filtering by the first filter 100 and opened during cleaning. During cleaning, the purified water provided by the water inlet module 500 flows directly into the water outlet module 600 via the bypass line 502, supplying the water demand system. The water supply to the water demand system is uninterrupted. Since the cleaning time of the first filter 100 is relatively short, typically 10 seconds, the impact of the unfiltered purified water during this brief period of time is minimal and can be ignored.

[0035] Optionally, the water filtration system further includes a second filter, and the first end of the bypass line 502 is connected to the water inlet 103 through the second filter.

[0036] It should be understood that if costs permit, a second filter can also be installed on the bypass line 502. When the first filter 100 is cleaned, the water inlet module 500 provides water to be purified, which flows into the bypass line 502, is filtered by the second filter on the bypass line 502, and then flows out to the water outlet module 600 to supply water to the water-demanding system.

[0037] Optional, such as Figure 1 As shown, the water filtration system further includes a detection component, and the detection component includes a first detection component 503 . The first detection component 503 is provided at the water inlet 103 .

[0038] The first detection part 503 can be a pressure gauge, which is arranged on the pipeline connecting the water inlet module 500 and the water inlet 103 through a manual valve to detect the pressure of the water inlet 103 of the first filter 100. The detection component can also include a second detection part 304 and a third detection part 105. The second detection part 304 can be arranged at the buffer 300. Specifically, it can be connected to the second cavity by a pipeline, and a manual valve and the second detection part 304 can be arranged on the pipeline. Similarly, it can be connected to the first cavity by a pipeline, and a manual valve and the third detection part 105 can be arranged on the pipeline. The second detection part 304 and the third detection part 105 can both be pressure gauges, which are used to detect the pressure inside the buffer 300 and the first filter 100 respectively. When the internal pressure of the first filter 100 exceeds the limit value, it means that the internal pressure of the first filter 100 is too high and may burst the first filter 100, and human intervention is required. The human intervention can be carried out by cleaning the first filter 100.

[0039] The detection component may also include a radiation detector, which may be located 1-2 m away from the filter housing to detect the radiation level. When the radiation level exceeds a preset value, such as 1×10 4 At Gy, the first filter 100 is cleaned.

[0040] Optional, such as Figure 1 As shown, the water filtration system also includes a valve assembly, which includes a first valve 504 and a second valve 601. The water inlet module 500 is connected to the water inlet 103 through the first valve 504, and the water outlet module 600 is connected to the water outlet 104 through the second valve 601.

[0041] The first valve 504 and the second valve 601 can both be pneumatic valves. The valve assembly can also include a fourth valve 202, which is arranged on the pipeline connecting the air intake module 200 and the air inlet 101; the valve assembly can also include a fifth valve 402, which is arranged on the pipeline connecting the air intake 101 and the exhaust module 400; the valve assembly can also include a sixth valve 305, which is arranged on the pipeline connecting the drain outlet 102 and the first opening 301; the valve assembly can also include a seventh valve 306, which is arranged on the pipeline connecting the second opening 302 and the waste liquid treatment module; the valve assembly can also include an eighth valve 403, which is arranged on the pipeline connecting the third opening 303 and the second check valve 401.

[0042] By adding a valve assembly, the control of the water filtration system can be enhanced. Specifically, when the first filter 100 is filtering normally, the first valve 504 and the second valve 601 are open, the third valve 505, the fourth valve 202, the fifth valve 402, the sixth valve 305, the seventh valve 306, and the eighth valve 403 are all closed, the valves at both ends of the differential pressure transmitter 501 are open, and the manual valves connected to the detection element are all open. The water inlet module 500 outputs the water to be purified, which flows through the first valve 504 and flows into the first filter 100 from the water inlet 103. Under the action of the differential pressure, the purified water passes through the filter element. Under the interception effect of the filter element pores, impurities are intercepted on the outer surface of the filter element, achieving the separation of water and impurities. The purified water passes through the filter element and flows out from the water outlet 104. After flowing through the second valve 601, it flows to the water outlet module 600.

[0043] As the filtration process continues, the impurities accumulated on the surface of the filter element gradually increase and thicken, and the pressure difference at the water inlet 103 and the water outlet 104 of the first filter 100 will become higher and higher. When it exceeds the preset value (the preset value can be 0.25 MPa, and the preset value can vary depending on the system), the differential pressure transmitter 501 sends a corresponding indication signal, indicating that the filter element of the first filter 100 is clogged beyond the allowable level, and the air intake module 200 is started to backwash and clean the filter element. The specific process is as follows: the first valve 504 and the second valve 601 are closed by the indication signal of the differential pressure transmitter 501, and the third valve 505 and the fourth valve 202 are opened. The water to be purified can enter the water outlet module 600 through the bypass line 502. The air inlet module 200 blows air into the first filter 100 to apply air pressure. When the air pressure in the first filter 100 reaches the set value, the fourth valve 202 is closed and the sixth valve 305 is opened. Under the pressure of the air, the water in the first cavity flows in the reverse direction through the filter element. Under the impact of the reverse flow of water, impurities attached to the surface of the filter element are peeled off and discharged from the drain port 102 with the water flow, flowing into the buffer 300. By observing the second detection element 304, after determining that the water flow and air flow in the buffer 300 are stable, the seventh valve 306 is opened to drain the water. When the water in the first filter 100 and the buffer 300 is emptied, the sixth valve 305 is closed, and the fifth valve 402 and the eighth valve 403 are opened to exhaust the air.

[0044] After the filter element cleaning process is completed, the third valve 505, the fifth valve 402, the seventh valve 306 and the eighth valve 403 are closed, the first valve 504 and the second valve 601 are opened, the first filter 100 filters normally and waits for the next cleaning.

[0045] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A water filtration system, characterized in that: The water filtration system includes a first filter and an air intake module; The first filter includes a first housing and a filter element. A first cavity is provided in the first housing. An air inlet and a drain port are provided on the first housing. Both the air inlet and the drain port are connected to the first cavity. The filter element is provided in the first cavity. The drain port is arranged opposite to the filter element. The air intake module is in communication with the air inlet, and the air intake module applies air pressure to the first filter through the air inlet; The water filtration system further includes a buffer, the buffer including a second shell, a second cavity being defined therein, a first opening and a second opening being defined on the second shell, the first opening and the second opening both being in communication with the second cavity, and the first opening being in communication with the drain port; The water filtration system further includes an exhaust module, and the second shell is further provided with a third opening, the third opening being in communication with the second cavity and the exhaust module respectively; The first shell is further provided with a water inlet and a water outlet, both of which are in communication with the first cavity; The water filtration system also includes a water inlet module, a water outlet module, and a bypass pipeline; The water inlet module is connected to the water inlet, and the water outlet module is connected to the water outlet; The first end of the bypass line is communicated with the water inlet, and the second end of the bypass line is communicated with the water outlet.

2. The water filtration system according to claim 1, characterized in that The water filtration system further includes a differential pressure transmitter, the water inlet is communicated with a first end of the differential pressure transmitter, and the water outlet is communicated with a second end of the differential pressure transmitter.

3. The water filtration system according to claim 1, wherein: The water filtration system further includes a first check valve and a second check valve, the air intake module is connected to the air inlet through the first check valve, and the third opening is connected to the exhaust module through the second check valve.

4. The water filtration system according to claim 1, wherein: The water filtration system further includes a second filter, and the first end of the bypass line is connected to the water inlet through the second filter.

5. The water filtration system according to claim 2, wherein: The water filtration system further includes a detection component, which includes a first detection member. The first detection member is provided at the water inlet.

6. The water filtration system according to claim 1, wherein: The water filtration system further includes a valve assembly, which includes a first valve and a second valve. The water inlet module is connected to the water inlet through the first valve, and the water outlet module is connected to the water outlet through the second valve.

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