High-precision radioactive waste liquid solid suspended particle filtering device

Abstract

The utility model relates to a high-precision radioactive waste liquid solid suspended particle filtering device, and relates to the field of radioactive waste liquid treatment in the nuclear energy technology. The utility model relates to a high-precision radioactive waste liquid solid suspended particle filtering device, which comprises: a filter, which is internally provided with a plurality of filtering membrane tubes and is used for intercepting and removing solid suspended particles in a turbid liquid to be filtered to generate a filtered clear liquid; the slag storage tank is used for collecting and discharging slag liquid generated after filtration of the filter; the gas-liquid mixer is used for mixing the blowback gas with the filtered clear liquid to form a gas-liquid mixture; a high-precision fiber demister is arranged in the gas-liquid separator, and the gas-liquid separator is used for removing water mist from the exhausted gas and exhausting the gas to a ventilation system. Solid suspended particles in the turbid liquid to be filtered can be effectively intercepted and removed, and the cleanliness of the filtered clear liquid is ensured.

Description

Technical Field

[0001] The present application relates to the field of radioactive waste liquid treatment in nuclear energy technology, and in particular to a high-precision radioactive waste liquid solid suspended particle filtering device. Background Art

[0002] During the operation and nuclear fuel processing of nuclear power plants, a large amount of radioactive waste liquid is generated. These waste liquids contain a variety of radioactive ions and suspended solid particles, which need to be strictly treated to meet environmental protection standards.

[0003] At present, nuclear power radioactive waste liquid treatment systems generally use a treatment process of filtration plus ion exchange. This process shows a high efficiency in removing radioactive ions from waste liquid, and can effectively remove radioactive ions from waste water through the selective adsorption and exchange of ion exchange resins.

[0004] However, existing filtration and ion exchange processes face challenges when treating wastewater containing suspended solid particles. Ion exchange resins have relatively weak adsorption capacity for suspended solid particles, resulting in the inability to effectively remove these particles. This not only reduces the efficiency of wastewater treatment, but may also cause frequent clogging of filters in radioactive wastewater treatment systems, increasing maintenance costs and operational difficulties. Summary of the invention

[0005] In view of the problems existing in the existing nuclear power radioactive waste liquid treatment system when treating waste liquid containing suspended solid particles, this application aims to solve the following technical problems:

[0006] Improve the removal efficiency of suspended solid particles: Design a set of high-precision suspended solid particle filtration devices that can quickly and effectively remove suspended solid particles in waste liquid and avoid frequent clogging of filters in the radioactive waste liquid treatment system.

[0007] Ensure the cleanliness of radioactive waste liquid: By improving the removal efficiency of suspended solid particles, ensure that the radioactive waste liquid can reach a high degree of cleanliness after treatment, providing favorable conditions for subsequent treatment processes.

[0008] In response to the above problems, the present application provides a design scheme for a high-precision suspended solid particle filtration device, aiming to solve the problems existing in the prior art and improve the treatment efficiency and stability of nuclear power radioactive waste liquid treatment systems.

[0009] The high-precision radioactive waste liquid solid suspended particle filtering device provided in this application adopts the following technical solution:

[0010] A high-precision radioactive waste liquid solid suspended particle filtering device, comprising:

[0011] The filter has multiple filter membrane tubes inside, which are used to intercept and remove the solid suspended particles in the turbid liquid to be filtered to generate a clear liquid after filtration;

[0012] The slag storage tank is used to collect and discharge the slag liquid produced after filtering by the filter;

[0013] A gas-liquid mixer, used for mixing the backwash gas with the filtered clear liquid to form a gas-liquid mixture;

[0014] The gas-liquid separator has a high-precision fiber demister inside to remove water mist from the exhaust gas and discharge it into the ventilation system;

[0015] The filter is provided with an inlet pipe for turbid liquid to be filtered and an outlet pipe for residual turbid liquid; the inlet pipe for turbid liquid to be filtered and the outlet pipe for residual turbid liquid are respectively provided with cut-off valves; the slag discharge port of the filter is connected with the slag storage tank through a slag discharge pipe, and the slag discharge pipe is fixedly connected with a slag discharge valve;

[0016] The exhaust port of the filter is connected to the gas-liquid separator through an exhaust pipe, the outlet of the gas-liquid separator is connected to the exhaust system, and an exhaust valve is fixedly connected to the exhaust pipe;

[0017] The outlet of the filtered clear liquid of the filter is connected to the inlet of the gas-liquid mixer through a liquid delivery pipe, and a stop valve is fixedly connected to the liquid delivery pipe;

[0018] The inlet of the gas-liquid mixer is connected to the end of the liquid delivery pipe facing away from the filter, and the outlet of the gas-liquid mixer is connected to a drain pipe, which is used to transport the filtered clear liquid to the next treatment system. The drain pipe is connected to a backwash gas pipe, and the backwash gas tank and the drain pipe are fixedly connected by a three-way valve.

[0019] Optionally, the filter is provided with a pressure gauge and a liquid level gauge, the pressure gauge is used to monitor the pressure in the filter, and the liquid level gauge is used to monitor the liquid level height in the filter.

[0020] Optionally, a pressure differential meter is provided on the turbid liquid inlet pipe and the liquid delivery pipe of the filter, respectively, and the pressure differential meter is used to monitor the pressure difference of the filter.

[0021] Optionally, the slag storage tank is provided with a material level meter for monitoring the internal material level height.

[0022] Optionally, the slag storage tank is fixedly connected with a pressure relief pipe, the other end of the pressure relief pipe is connected with an exhaust pipe, and the pressure relief pipe is fixedly connected with a pressure relief valve.

[0023] Optionally, the slag storage tank is provided with a pressure instrument, and the pressure instrument is used to monitor the pressure in the slag storage tank.

[0024] Optionally, an end cap is fixedly connected to the top of the filter by screws, and the filter membrane tube inside the filter is vertically arranged, and multiple filter membrane tubes are evenly distributed along the axis of the filter.

[0025] Optionally, the filtering device adopts PLC full-automatic control to realize automatic operation of starting and stopping, cleaning and regeneration, and slag discharge of the filter.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The device of the present application can effectively intercept and remove solid suspended particles in the turbid liquid to be filtered by arranging multiple high-precision filter membrane tubes in the filter, ensuring the cleanliness of the clear liquid after filtration. The design of mixing the backwash gas with the clear liquid after filtration helps to remove residual particles on the filter membrane tube and prevent filter clogging, thereby improving filtration efficiency and stability. The device of the present application has a backwashing function, which can realize the reuse of filter membrane tubes and reduce production costs.

[0028] 2. This application can ensure that the waste liquid reaches a high degree of cleanliness after treatment through the design of high-precision filter membrane tubes, providing favorable conditions for subsequent treatment processes. The gas-liquid separator equipped with a high-precision fiber demister can effectively remove water mist from the exhaust gas, prevent radioactive substances from leaking into the environment, and no secondary pollutants are generated during the operation process, which improves the safety and cleanliness of the treatment process.

[0029] 3. Through PLC full-automatic control, the start and stop, cleaning and regeneration, and slag discharge of the filter are automated, reducing the complexity and workload of manual operations. Key components such as filters, slag storage tanks, and gas-liquid separators are equipped with monitoring equipment such as pressure gauges, liquid level gauges, differential pressure meters, and material level meters, which can monitor the operating status of the device in real time, detect and handle potential problems in a timely manner, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a high-precision radioactive waste liquid solid suspended particle filtering device;

[0031] Figure 2 The present invention is a cross-sectional view of a filter of a high-precision radioactive waste liquid solid suspended particle filtering device.

[0032] Explanation of the reference numerals: 1. Filter; 11. End cover; 12. Filter membrane tube; 13. Inlet pipe for turbid liquid to be filtered; 131. Pressure difference meter; 14. Outlet pipe for residual turbid liquid; 141. Shut-off valve; 15. Pressure gauge; 16. Liquid level gauge; 17. Slag discharge pipe; 171. Slag discharge valve; 18. Exhaust pipe; 181. Exhaust valve; 19. Liquid delivery pipe; 191. Shut-off valve; 2. Slag storage tank; 21. Level meter; 22. Pressure meter; 23. Pressure relief pipe; 231. Pressure relief valve; 3. Gas-liquid mixer; 31. Liquid discharge pipe; 32. Back-blowing gas pipe; 33. Three-way valve; 4. Gas-liquid separator. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-2 This application is described in further detail.

[0034] The present application embodiment discloses a high-precision radioactive waste liquid solid suspended particle filtering device. Figure 1 A high-precision radioactive waste liquid solid suspended particle filtering device includes a filter 1, a slag storage tank 2, a gas-liquid mixer 3 and a gas-liquid separator 4.

[0035] Reference Figure 1 and Figure 2 The filter 1 has an end cap 11 fixedly connected to the top by screws. A plurality of filter membrane tubes 12 are arranged inside the filter 1. The filter membrane tubes 12 are arranged vertically along the axial direction. The plurality of filter membrane tubes 12 are evenly spaced along the axis of the filter 1. The filter 1 is provided with an inlet pipe 13 for turbid liquid to be filtered and an outlet pipe 14 for residual turbid liquid; a cut-off valve 141 is respectively provided on the turbid liquid inlet pipe 13 and the residual turbid liquid outlet pipe 14. The turbid liquid inlet pipe 13 and the liquid delivery pipe 19 of the filter 1 are respectively provided with a differential pressure meter 131, which is used to monitor the pressure difference of the filter 1. The filter 1 is provided with a pressure gauge 15 and a liquid level gauge 16, the pressure gauge 15 is used to monitor the pressure in the filter 1, and the liquid level gauge 16 is used to monitor the liquid level height in the filter 1.

[0036] Reference Figure 1 and Figure 2 The slag discharge port of the filter 1 is connected to the slag storage tank 2 through a slag discharge pipe 17, and a slag discharge valve 171 is fixedly connected to the slag discharge pipe 17. The slag storage tank 2 is used to collect and discharge the slag liquid generated after filtering by the filter 1. A material level meter 21 is provided on the slag storage tank 2 to monitor the internal material level height.

[0037] Reference Figure 1 and Figure 2 The exhaust port of the filter 1 is connected to the gas-liquid separator 4 through the exhaust pipe 18, and the exhaust pipe 18 is fixedly connected with an exhaust valve 181. A high-precision fiber demister is arranged inside the gas-liquid separator 4 to remove water mist from the exhausted gas and discharge it to the ventilation system.

[0038] Reference Figure 1 and Figure 2 The slag storage tank 2 is provided with a pressure instrument 22, which is used to monitor the pressure in the slag storage tank 2. The slag storage tank 2 is fixedly connected with a pressure relief pipe 23, the other end of which is connected with the exhaust pipe 18, and the pressure relief pipe 23 is fixedly connected with a pressure relief valve 231.

[0039] Reference Figure 1 and Figure 2 The outlet of the filtered clear liquid of the filter 1 is connected to the inlet of the gas-liquid mixer 3 through the liquid delivery pipe 19, and the liquid delivery pipe 19 is fixedly connected with a stop valve 191. The gas-liquid mixer 3 is used to mix the backwash gas with the filtered clear liquid to form a gas-liquid mixture. The inlet of the gas-liquid mixer 3 is connected to the end of the liquid delivery pipe 19 away from the filter 1, and the outlet of the gas-liquid mixer 3 is connected to a drain pipe 31, which is used to transport the filtered clear liquid to the next treatment system. The drain pipe 31 is connected to a backwash gas pipe 32, and the backwash gas tank and the drain pipe 31 are fixedly connected through a three-way valve 33.

[0040] Reference Figure 1 and Figure 2 In this embodiment, all valves are program-controlled valves, which are connected to PLC to realize remote control of computer programs, thereby realizing the automatic operation of starting and stopping, cleaning and regeneration, and slag discharge of the filtering device.

[0041] The implementation principle of a high-precision radioactive waste liquid solid suspended particle filtering device in the embodiment of the present application is as follows: the filter 1, the slag storage tank 2, the gas-liquid mixer 3 and the gas-liquid separator 4 and other components are installed to ensure that each connection is sealed reliably. All program-controlled valves are connected to the PLC and initialized to ensure that the remote control function is normal.

[0042] When starting work, open the shut-off valve 141 on the turbid liquid inlet pipe 13 to allow the turbid liquid to enter the filter 1. Close the shut-off valve 141 on the residual turbid liquid outlet pipe 14 to prevent the unfiltered waste liquid from being directly discharged. The filter 1 starts working, and the solid suspended particles in the waste liquid are intercepted by the filter membrane tube 12. During the filtration process, the differential pressure meter 131 continuously monitors the differential pressure of the filter 1. As the filter cake layer thickens, the differential pressure gradually increases. The pressure gauge 15 and the liquid level gauge 16 monitor the pressure and liquid level in the filter 1 respectively to ensure that the filtration process is carried out within a safe range.

[0043] When the pressure difference reaches the maximum allowable value, close the shut-off valve 141 on the turbid liquid inlet pipe 13 to stop filtering. Open the shut-off valve 141 on the residual turbid liquid outlet pipe 14 to discharge the residual turbid liquid in the filter 1. Open the slag discharge valve 171 to discharge the trapped slag liquid into the slag storage tank 2 for collection and treatment. During the filtering process, open the exhaust valve 181 to allow the gas generated in the filter 1 to enter the gas-liquid separator 4 through the exhaust pipe 18. In the gas-liquid separator 4, the water mist is removed by a high-precision fiber demister, and then the clean gas is discharged to the ventilation system.

[0044] When the slag tank 2 starts to collect the slag liquid produced after filtering by the filter 1, the entry of the slag liquid may cause the pressure in the tank to change. The pressure meter 22 set on the slag tank 2 will continuously monitor the pressure in the tank and feed back the pressure data to the control system (such as PLC) in real time. The control system determines whether the pressure in the slag tank 2 is too high or abnormal based on the preset pressure threshold. If the pressure in the tank is within the normal range, the collection and treatment of the slag liquid will continue. If the pressure in the tank exceeds the preset threshold, the control system will start the pressure relief program. The control system sends an opening signal to the pressure relief valve 231 to open the pressure relief valve 231. When the pressure relief valve 231 is opened, the high-pressure gas or liquid in the slag tank 2 will flow to the exhaust pipe 18 through the pressure relief pipe 23, and finally be discharged to the ventilation system or other safe areas. As the gas is discharged, the pressure in the slag tank 2 gradually decreases until it reaches a safe range.

[0045] When the filter membrane tube 12 needs to be cleaned, the backwash gas is introduced from the backwash gas tank into the gas-liquid mixer 3 through the control of the three-way valve 33, and mixed with the filtered clear liquid to form a gas-liquid mixture. During the backwashing process, the mixed liquid of the backwash gas and the filtered clear liquid will reversely flush the filter membrane tube 12 at a certain speed and pressure, thereby removing the suspended solid particles and dirt attached to the membrane tube.

[0046] After the backwashing is completed, the related valves on the backwashing gas pipe 32 and the drain pipe 31 are closed, and the cut-off valves 141 on the turbid liquid inlet pipe 13 to be filtered and the residual turbid liquid outlet pipe 14 are opened to restore the filtration system to normal operation.

[0047] After the cleaning and regeneration is completed, all the slag discharge and exhaust valves 181 are closed to prepare for restarting the filter 1. The shut-off valve 141 on the filtrate inlet pipe 13 is opened, and the filter 1 starts filtering again. The entire filtering and cleaning process is fully automatically controlled by the PLC, and the pressure difference instrument 131, the pressure gauge 15, the liquid level gauge 16 and other instruments continuously monitor the status of the filter 1. When the cleaning conditions are met again, the system automatically executes the cleaning and regeneration process to achieve unmanned operation.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-precision radioactive waste liquid solid suspended particle filtering device, characterized in that: include: The filter (1) is provided with a plurality of filter membrane tubes (12) for intercepting and removing solid suspended particles in the turbid liquid to be filtered to generate a clear liquid after filtration; A slag storage tank (2) is used to collect and discharge the slag liquid produced after being filtered by the filter (1); A gas-liquid mixer (3) is used to mix the backwash gas with the filtered clear liquid to form a gas-liquid mixture; A gas-liquid separator (4) is provided with a high-precision fiber demister inside, which is used to remove water mist from the exhausted gas and discharge it into the ventilation system; The filter (1) is provided with a turbid liquid inlet pipe (13) for filtering and a residual turbid liquid outlet pipe (14); the turbid liquid inlet pipe and the residual turbid liquid outlet pipe (14) are respectively provided with cut-off valves (141); the slag discharge port of the filter (1) is connected to the slag storage tank (2) through a slag discharge pipe (17), and the slag discharge pipe (17) is fixedly connected with a slag discharge valve (171); The exhaust port of the filter (1) is connected to the gas-liquid separator (4) through an exhaust pipe (18); the outlet of the gas-liquid separator (4) is connected to an exhaust system; and an exhaust valve (181) is fixedly connected to the exhaust pipe (18); The outlet of the filtered clear liquid of the filter (1) is connected to the inlet of the gas-liquid mixer (3) through a liquid delivery pipe (19), and a stop valve (191) is fixedly connected to the liquid delivery pipe (19); The inlet of the gas-liquid mixer (3) is connected to the end of the liquid delivery pipe (19) facing away from the filter (1), and the outlet of the gas-liquid mixer (3) is connected to a liquid discharge pipe (31). The liquid discharge pipe (31) is used to transport the filtered clear liquid to the next treatment system. The liquid discharge pipe (31) is connected to a back-blowing gas pipe (32). The back-blowing gas tank and the liquid discharge pipe (31) are fixedly connected via a three-way valve (33).

2. A high-precision radioactive waste liquid solid suspended particle filtering device according to claim 1, characterized in that: The filter (1) is provided with a pressure gauge (15) and a liquid level gauge (16); the pressure gauge (15) is used to monitor the pressure in the filter (1), and the liquid level gauge (16) is used to monitor the liquid level in the filter (1).

3. A high-precision radioactive waste liquid solid suspended particle filtering device according to claim 2, characterized in that: A pressure differential meter (131) is provided on the turbid liquid inlet pipe (13) and the liquid delivery pipe (19) of the filter (1), respectively. The pressure differential meter (131) is used to monitor the pressure differential of the filter (1).

4. The high-precision radioactive waste liquid solid suspended particle filtering device according to claim 1 is characterized by: The slag storage tank (2) is provided with a material level meter (21) for monitoring the internal material level height.

5. The high-precision radioactive waste liquid solid suspended particle filtering device according to claim 1 is characterized by: The slag storage tank (2) is fixedly connected to a pressure relief pipe (23), the other end of the pressure relief pipe (23) is connected to an exhaust pipe (18), and the pressure relief pipe (23) is fixedly connected to a pressure relief valve (231).

6. A high-precision radioactive waste liquid solid suspended particle filtering device according to claim 5, characterized in that: The slag storage tank (2) is provided with a pressure meter (22), and the pressure meter (22) is used to monitor the pressure in the slag storage tank (2).

7. The high-precision radioactive waste liquid solid suspended particle filtering device according to claim 1 is characterized by: The top of the filter (1) is fixedly connected with an end cover (11) by means of screws, and the filter membrane tube (12) inside the filter (1) is vertically arranged, and a plurality of filter membrane tubes (12) are evenly distributed along the axis of the filter (1).

8. A high-precision radioactive waste liquid solid suspended particle filtering device according to any one of claims 1 to 7, characterized in that: The filtering device adopts PLC full-automatic control to realize the automatic operation of starting and stopping, cleaning and regeneration, and slag discharge of the filter (1).

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