Plug flow type decay tank with high impact resistance
By setting up a regulating pool, radiation concentration detection device and return system in the push-flow decay pool, combined with the design of zigzag overflow weir and water flow baffle, the push-flow decay pool has poor impact resistance and unstable water quality in the effluent water is solved. The problem is that the automatic control and uniform distribution of sewage is achieved, and the operation efficiency and safety of the decay pool are improved.
Patent Information
- Application Number
- CN202420381147.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The existing push-flow decay pool has poor impact resistance and unstable water quality of the effluent, which is prone to pollution in radioactive sewage leakage accidents, and lacks mature technical processes and professional equipment.
A push-flow decay pool including sludge pool, regulation pool, decay pool and sampling pool was designed. Automatic control of sewage is achieved by setting up a regulation pool, radiation concentration detection device, return pump and electronically controlled valve to ensure that sewage reaches It is discharged after the discharge standard, and the sewage that does not meet the standards is returned to the regulation tank, and the water flow uniformity and operation efficiency are improved through the zigzag overflow weir, water flow baffle and diversion angle.
The impact resistance of the push-flow decay pool is improved, the water quality of the effluent is stable and reliable, the radiation pollution accident is avoided, and the automatic management and uniform distribution of sewage is achieved.
Smart Images
Figure CN222145809U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of nuclear medicine wastewater treatment, in particular to a plug-flow decay pool with strong impact resistance. Background Art
[0002] In recent years, with the development of nuclear medicine technology, the use of radioactive isotopes to treat patients has gradually been widely used. More and more large and medium-sized hospitals have opened nuclear medicine departments to treat the human body with radionuclides. When this treatment mode is adopted, patients need to take or be injected with radioactive drugs, and most radioactive drugs will be excreted by the human body in the form of metabolism. If these sewage containing radioactive elements are directly discharged into the sewage network, it will pollute the surrounding environment and endanger the safety and health of the public. Therefore, sewage containing radioactive elements needs to be collected and decayed into decay pools first and decayed to the activity requirements specified in the "Medical Institution Water Pollutant Discharge Standard" and the "Hospital Wastewater Treatment Design Code" before it can be discharged into the hospital's sewage treatment station. At present, decay pools are divided into two categories: plug-flow decay pools (continuous decay pools) and trough decay pools (intermittent decay pools): The main body of the trough decay pool is designed as 2 or more trough pool bodies, which alternately store, decay and discharge waste liquid. The waste liquid is first discharged into the No. 1 pool for decay. When the No. 1 pool is almost full of waste liquid, the No. 1 pool is automatically closed through intelligent control and the No. 2 decay pool is opened at the same time for the discharge of radioactive waste liquid, so as to circulate. Each decay pool is equipped with a detection device to display the specific activity of radioactive waste liquid. The system pre-sets the safe discharge threshold of waste liquid. When the discharge standard is reached, the system allows discharge. It is discharged to the environment through the sewage treatment station to ensure that the radiation level of the water environment is not affected. The trough decay pool has strong impact resistance and stable and reliable effluent water quality; the disadvantage is that the total volume of the decay pool is large, the floor area is large, and the cost is high. At present, the technical development of trough decay pools and related intelligent control methods in my country is relatively complete, and there are many professional trough decay pool manufacturers on the market; plug-flow decay pools generally include sludge pools, continuous decay pools and detection pools. The continuous decay pool body is generally divided into 3-5 levels, and a diversion wall or diversion pipe is set in the pool. After entering the pool, the radioactive wastewater flows in the form of slow plug flow, and after the required hydraulic retention time, it can be discharged from the pool to the relevant sewage treatment station. The plug-flow decay pool has a small volume, small footprint, low cost and easy operation; the disadvantage is that it has poor impact resistance. If there is an accident of leakage of radioactive materials at the front end or the discharge of radioactive wastewater is large in a certain period of time, the flow rate of radioactive wastewater in the decay pool will increase, and it will have to be discharged by plug flow before it decays to the allowable discharge concentration, causing a radioactive pollution accident. At present, there is no mature and complete technical process, nor is there a corresponding professional equipment manufacturer. However, in recent years, with the attention of our country and the release of relevant standards, domestic research on plug-flow decay pools has gradually increased, and a number of research results on continuous decay pools have emerged, but there is no plug-flow decay pool with strong impact resistance and stable and reliable effluent water quality. Utility Model Content
[0003] In view of this, the purpose of the utility model is to provide a plug-flow decay pool with strong impact resistance, strong impact resistance and stable and reliable effluent water quality.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A plug-flow decay tank with strong impact resistance comprises a tank body, wherein the tank body is divided into a sludge tank, a regulating tank, a decay tank and a sampling tank arranged in sequence in the left and right directions by a partition wall, an overflow weir is arranged on the partition wall between the sludge tank and the regulating tank and on the partition wall between the decay tank and the sampling tank, a wastewater lifting pump is arranged in the regulating tank, a water outlet of the wastewater lifting pump is connected to a water pipe, the water pipe passes through the partition wall between the regulating tank and the decay tank, a water inlet pipe is arranged on the sludge tank, a drain pipe is arranged on the sampling tank, an electric control valve is arranged on the drain pipe, a reflux pump is arranged in the sampling tank, a water outlet of the reflux pump is connected to a reflux pipe, and an outlet of the reflux pipe is located in the regulating tank, a radiation concentration detection device is also arranged in the sampling tank, the radiation concentration detection device is electrically connected to a controller, and the controller is electrically connected to the reflux pump and the electric control valve.
[0006] Furthermore, a water flow baffle parallel to the partition wall and with a gap therebetween is provided on the regulating tank side of the decay tank, a gap is formed between the lower side of the water flow baffle and the bottom wall of the decay tank, the outlet of the water pipe is located in the gap between the water flow baffle and the regulating tank, a plurality of water holes are evenly spaced along the width direction of the upper part of the water flow baffle, and the height of the lower side of the water hole is the same as that of the overflow weir.
[0007] Furthermore, the overflow weir is sawtooth-shaped.
[0008] Furthermore, both left and right sides of the bottom of the decay pool are chamfered to form a guide angle.
[0009] Furthermore, there are three decay pools arranged side by side on the left and right, and an overflow weir is provided on the partition wall between two adjacent decay pools. The height of the overflow weir between the two adjacent decay pools is equal to the height of the overflow weir between the decay pool and the sampling pool.
[0010] The beneficial effects of the utility model are:
[0011] The utility model discloses a plug-flow decay pool with strong impact resistance. The water volume of the decay pool is controlled by setting a regulating pool. A radiation concentration detection device is set in the sampling pool to detect whether the radiation concentration of sewage in the sampling pool meets the standard. If the standard is met, the signal is transmitted to the controller, and the controller controls the electric control valve on the drain pipe to open, and the sewage is discharged from the drain pipe. If the standard is not met, the signal is transmitted to the controller, and the controller controls the electric control valve to close and controls the reflux pump to start to return the sewage with substandard radiation concentration to the regulating pool, thereby avoiding the discharge of wastewater with substandard radiation concentration. The plug-flow decay pool has strong impact resistance and stable and reliable effluent water quality.
[0012] Providing baffles and arranging water holes at even intervals in the width direction of the baffles is conducive to uniform distribution of sewage in the decay tank.
[0013] Uniform distribution of sewage is achieved by setting up a sawtooth overflow weir.
[0014] Diversion angles are set on the left and right sides of the bottom of the decay pool to avoid dead corners of water flow and improve the operating efficiency of the decay pool.
[0015] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings, in which:
[0017] Figure 1 It is a top sectional view of the utility model.
[0018] Figure 2 for Figure 1 Middle AA section view.
[0019] Figure 3 This is a side view of the partition wall.
[0020] Figure 4 This is a side view of the water flow baffle.
[0021] In the figure: sludge tank 1, sludge tank No. 1 111, sludge tank No. 2 112, regulating tank 2, decay tank 3, decay tank No. 1 31, decay tank No. 2 32, decay tank No. 3 33, sampling tank 4, overflow weir 5, wastewater lifting pump 6, water pipe 7, water inlet pipe 8, drainage pipe 9, reflux pump 10, water flow baffle 11, water hole 12, diversion angle 13, reflux pipe 14. DETAILED DESCRIPTION
[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.
[0023] like Figure 1-2As shown, a plug-flow decay tank with strong impact resistance has a tank body as the main body, and the tank body is divided into a No. 1 sludge tank 111, a No. 2 sludge tank 112, a regulating tank 2, a No. 1 decay tank 31, a No. 2 decay tank 32, a No. 3 decay tank 33 and a sampling tank 4 arranged from right to left in sequence by a plurality of partition walls. The upper part of the partition wall between the No. 1 sludge tank 111 and the No. 2 sludge tank 112 and the upper part of the partition wall between the No. 2 sludge tank 112 and the regulating tank 2 are both provided with overflow weirs 5 of equal height. The No. 1 decay tank 31 and the No. 2 decay tank 32 are arranged in the same manner. The upper part of the partition wall between the No. 1 decay pool 31, the upper part of the partition wall between the No. 2 decay pool 32 and the No. 3 decay pool 33, and the upper part of the partition wall between the No. 3 decay pool 33 and the sampling pool 4 are all provided with overflow weirs 5 of equal height, and the overflow weirs 5 are serrated, and / or, the No. 1 decay pool 31, the No. 2 decay pool 32 and the No. 3 decay pool 33 are all provided with water flow baffles 11 parallel to the partition wall and with a gap on the right side, and the upper side and the front and rear sides of the water flow baffles 11 are sealed and connected to the upper wall of the pool body, and there is a gap between the lower side and the pool body wall, and the water flow baffles 11 are all along the width direction thereof. Three water holes 12 are evenly spaced, and the height of the bottom of the water hole 12 is consistent with the height of the overflow weir 5. The bottoms of the No. 1 decay pool 31, the No. 2 decay pool 32 and the No. 3 decay pool 33 are chamfered at 45° on both sides to form a diversion angle 13. A wastewater lifting pump 6 is provided on the side of the No. 1 decay pool 31 in the regulating pool 2. The water outlet of the wastewater lifting pump 6 is connected to a water pipe 7. The water pipe 7 runs through the partition wall between the regulating pool 2 and the No. 1 decay pool 31, and its outlet is located in the gap between the water flow baffle 11 and the regulating pool 2. A reflux pump 10 is provided in the sampling pool 4, and the water outlet of the reflux pump 10 is connected to a reflux pipe 14. The outlet of the reflux pipe 14 is located in the regulating pool 2. A radiation concentration detection device is provided in the sampling pool 4, and the radiation concentration detection device is electrically connected to a controller, and the controller is electrically connected to the reflux pump 10. The radiation concentration detection device is a known conventional technology. An inlet pipe 8 is provided on the No. 1 sludge pool 111, and a drain pipe 9 is provided on the sampling pool 4. An electrically controlled valve is provided on the drain pipe 9, and the electrically controlled valve is electrically connected to the controller.
[0024] When in use, the staff first inspects the decay pool to check whether there is leakage, blockage, and whether the pool body has radiation protection measures. If there are defects, it cannot be used. At this time, it is necessary to notify the maintenance personnel to carry out maintenance and suspend the entry of radioactive wastewater. If there are no above problems, it can be used. When in use, the No. 1 sludge pool 111 is directly fed with water from the water inlet pipe 8. After the water flows through the No. 1 sludge pool 111 and the No. 2 sludge pool 112 for storage, it flows into the regulating pool 2 through the overflow weir 5. The wastewater lifting pump 6 in the regulating pool 2 discharges the sewage into the No. 1 decay pool 31. The sewage passes through the No. 1 decay pool 31, the No. 2 decay pool 31, and the No. 2 decay pool 31 in turn. The No. 1 decay pool 32 and the No. 3 decay pool 33 decay, and the overflow weir 5 and the three guide holes 12 on the water flow baffle 11 realize dispersed water distribution. The sewage finally enters the sampling pool 4 through the No. 3 decay pool 33. When the radiation concentration detection device in the sampling pool 4 detects that the radiation concentration of the sewage is up to the standard, the signal is transmitted to the controller, and the controller controls the electric control valve to open, and the sewage is discharged through the drain pipe 9. When the radiation concentration detection device in the sampling pool detects that the radiation concentration of the sewage is not up to the standard, the signal is transmitted to the controller, and the controller controls the electric control valve on the drain pipe 9 to close and controls the reflux pump 10 to start and return the sewage to the regulating tank through the reflux pipe 14.
[0025] The plug-flow decay tank with strong impact resistance controls the water volume of the decay tank by adding a regulating tank 2. The radiation concentration detection device in the sampling tank 4 is convenient for obtaining the radiation concentration of the sewage at the end of the decay tank to prevent the sewage in the decay tank from being discharged by mistake when it does not meet the discharge standard. The reflux pump 10 and the reflux pipe 14 are convenient for returning the sewage that does not meet the discharge standard to the regulating tank 2 to prevent the sampling tank from being fully loaded, thereby realizing automatic control. The overflow weir 5 is set to a serrated shape, and a water flow baffle 11 is set in the decay tank 3. Holes are opened evenly and equidistantly in the width direction of the water flow baffle 11, which are all conducive to the uniformity of sewage distribution. This design solves the uneven water flow characteristics in traditional decay tanks. In addition, a 45° chamfer is set at the bottom of the decay tank. This design solves the problem of water flow dead corners in traditional decay tanks, thereby reducing the operating efficiency of the decay tank.
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.
Claims
1. A plug-flow decay cell with strong impact resistance, Features: The invention comprises a tank body, wherein the tank body is divided into a sludge tank (1), a regulating tank (2), a decay tank (3) and a sampling tank (4) arranged in sequence in the left-right direction by a partition wall, an overflow weir (5) is provided on the partition wall between the sludge tank (1) and the regulating tank (2) and on the partition wall between the decay tank (3) and the sampling tank (4), a wastewater lifting pump (6) is provided in the regulating tank (2), a water outlet of the wastewater lifting pump (6) is connected to a water delivery pipe (7), and the water delivery pipe (7) passes through the partition wall between the regulating tank (2) and the decay tank (3) The sludge pool (1) is provided with a water inlet pipe (8), the sampling pool (4) is provided with a drainage pipe (9), the drainage pipe (9) is provided with an electrically controlled valve, a reflux pump (10) is provided in the sampling pool (4), the water outlet of the reflux pump (10) is connected to the reflux pipe (14), the outlet of the reflux pipe (14) is located in the regulating pool (2), and a radiation concentration detection device is also provided in the sampling pool (4), the radiation concentration detection device is electrically connected to a controller, and the controller is electrically connected to the reflux pump (10) and the electrically controlled valve.
2. The plug-flow decay cell with strong impact resistance according to claim 1, Features: A water flow baffle (11) is provided on the side of the regulating tank (2) in the decay tank (3) and is parallel to the partition wall and has a gap therebetween. A gap is formed between the lower side of the water flow baffle (11) and the bottom wall of the decay tank (3). The outlet of the water delivery pipe (7) is located in the gap between the water flow baffle (11) and the regulating tank (2). A plurality of water holes (12) are evenly spaced at intervals on the upper part of the water flow baffle (11) along its width direction. The height of the lower side of the water hole (12) is the same as that of the overflow weir (5).
3. The plug-flow decay cell with strong impact resistance according to claim 1, Features: The overflow weir (5) is sawtooth-shaped.
4. The plug-flow decay cell with strong impact resistance according to any one of claims 1 to 3, Features: The left and right sides of the bottom of the decay pool (3) are chamfered to form a guide angle (13).
5. The plug-flow decay cell with strong impact resistance according to claim 1, Features: The decay pools (3) are three and arranged side by side on the left and right. An overflow weir (5) is provided on the partition wall between two adjacent decay pools (3). The height of the overflow weir (5) between the two adjacent decay pools (3) is equal to the height of the overflow weir (5) between the decay pool (3) and the sampling pool (4).