Device for Stirring and Suspending Solid-Liquid Two-Phase in Large Storage Tank and Its Usage Method

Abstract

The present invention discloses a device for solid-liquid two-phase stirring and suspension in a large storage tank and its usage method, which relates to the technical field of radioactive waste treatment. The device includes a jet ejector, which comprises a device main body with a flange interface arranged at the lower end. A vertical impeller worm shaft is arranged in the device main body, and a turbine blade is installed at the lower end of the impeller worm shaft. A two-stage turbine worm transmission system is arranged in meshing with the impeller worm shaft. A rotating assembly is installed at the upper end of the device main body. The output end of the two-stage turbine worm transmission system is connected to the rotating assembly, and a rotating nozzle mechanism that is connected to the inside of the jet ejector and can rotate by itself is arranged on the rotating assembly. The present invention provides a set of jet stirring and suspension devices for radioactive waste resin, slurry, etc. in a large storage tank. The core device, the jet ejector, has a simple structure, low equipment failure rate, easy replacement of accessories, and simple operation, and can meet the stirring and suspension of radioactive waste resin, slurry, etc. in a large storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of radioactive waste treatment, and in particular to a device for stirring and suspending solid-liquid two-phase in a large storage tank and a using method thereof. Background Art

[0002] During the production and operation of nuclear military units, radioactive waste resins, mud and other wastes are mostly temporarily stored in large underground storage tanks, seriously over-serving their due dates and without establishing a device for extracting the wastes in the tanks. The waste resins, mud and other phases in the tanks are deposited at the bottom of the tank body, and the upper part is radioactive supernatant liquid. Due to over-serving their due dates, if stored continuously, there is a potential safety hazard of leakage of the phases in the tank. Therefore, the phases in the tank should be processed as soon as possible to eliminate the potential risk of waste release to the environment. No matter which treatment method is adopted, it is first necessary to stir and suspend the temporarily stored phases in the large storage tank to meet the requirements of extracting the phases in the tank and transporting them to the waste treatment facility.

[0003] The stirring methods for solid-liquid two-phase mainly include compressed air stirring, mechanical stirring and jet stirring. Compressed air stirring is mostly used in civil industries with low requirements for stirring uniformity. In the nuclear industry, due to the generation of a large amount of gas, which increases the pressure of gas purification treatment, its application is relatively limited. Mechanical stirring is to achieve the purpose of stirring by making the installed stirring paddle move. The scope of this kind of stirring action is small and it is suitable for stirring small tanks.

[0004] Compared with compressed air and mechanical stirring, jet stirring is a new type of built-in and three-dimensional all-round stirring method. Its working principle is to use a circulating pump to transport fluid to a jet device. The fluid is ejected from the nozzle of the jet device to form a jet. The continuous expansion of the jet will cause the surrounding fluid medium to form vortices under the action of viscous shear. The vortices entrain the surrounding medium, thereby realizing the stirring and mixing of the solid-liquid phases in the tank. The application of jet technology originated from the mining industry and was used to wash the mud in ores. The change from scouring to crushing is a qualitative change in the application of jet technology. The former is low pressure and large flow, while the latter is high pressure and small flow. Due to the advantages of simple structure of the core equipment of jet stirring, low equipment failure rate, easy replacement of accessories, simple operation, etc., its application has been extended from the simple mining industry to various industries such as petroleum and chemical industry.

[0005] The large storage tanks for temporarily storing radioactive waste resins, mud, etc. in the nuclear industry are over-serving their due dates and have a weak safety foundation. Therefore, in order to meet the requirements of stirring and suspending solid-liquid two-phase in a large storage tank and ensure the safety of the tank body, it is urgent to design a process system device for non-dead-angle stirring and suspending solid-liquid two-phase in a large storage tank. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide a device for solid-liquid two-phase stirring and suspension in a large storage tank and its usage method. The device has a simple structure, low failure rate, easy replacement of accessories, and simple operation, and can meet the stirring and suspension of radioactive waste resin, mud, etc. in a large storage tank.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A device for solid-liquid two-phase stirring and suspension in a large storage tank includes a jet ejector. The jet ejector includes a device main body with a flange interface at the lower end. A vertical impeller worm shaft is arranged in the device main body, and a turbine blade is installed at the lower end of the impeller worm shaft; A two-stage turbine worm transmission system is arranged meshing with the impeller worm shaft; A rotating assembly is installed at the upper end of the device main body. The output end of the two-stage turbine worm transmission system is connected to the rotating assembly, and a rotating nozzle mechanism that is connected to the inside of the jet ejector and can rotate by itself is arranged on the rotating assembly.

[0009] Further, the turbine blade is fixed on the impeller worm shaft by an impeller compression screw.

[0010] Further, the two-stage turbine worm transmission system includes a first-stage turbine gear arranged meshing with the impeller worm shaft. The first-stage turbine gear is installed on a first-stage turbine shaft. A second-stage turbine gear is arranged meshing with the first-stage turbine shaft. The second-stage turbine gear is installed on a second-stage turbine shaft. An annular intermediate plate is hermetically arranged at the upper end of the device main body. The second-stage turbine shaft penetrates through the intermediate plate, and a third-stage gear is arranged at the upper end of the second-stage turbine shaft. The third-stage gear is connected to the rotating assembly.

[0011] Further, the rotating assembly includes a gear sleeve arranged outside the third-stage gear. Internal tooth threads meshing with the third-stage teeth are arranged inside the gear sleeve; A main rotating body is connected above the gear sleeve, and the rotating nozzle shaft mechanism is installed on the main rotating body.

[0012] Further, the rotating nozzle mechanism includes a rotating nozzle shaft connected to the main rotating body through a nozzle bearing, and a spray nozzle arranged at the end of the rotating nozzle shaft; A planetary gear is installed at one end of the rotating nozzle shaft located inside the main rotating body. An inner sleeve is arranged in the gear sleeve in cooperation with a main rotating bearing. The upper end of the inner sleeve is a gear that can mesh with the planetary gear.

[0013] Further, 2 to 6 rotating nozzle mechanisms are arranged.

[0014] Further, a sealed installation cavity is arranged inside the device main body, and the impeller worm shaft, the first-stage turbine shaft, the first-stage turbine gear, the second-stage turbine shaft, and the second-stage turbine gear are all arranged in this installation cavity.

[0015] The usage method of the device for solid-liquid two-phase stirring and suspension in a large storage tank as described above includes:

[0016] S1: Open an opening above the storage tank, and extend both the suction pipeline and the return pipeline of the high self-priming circulating water pump into the storage tank through the opening. The suction port of the suction pipeline is located above the solid-phase liquid level and below the supernatant liquid level in the tank.

[0017] S2: Install the jet ejector below the liquid level in the storage tank.

[0018] S3: Adjust the jet ejector before operation according to the differences in the physical properties of the temporarily stored solid phase in the storage tank.

[0019] S4: Start the high self-priming circulating water pump, open the return valve, adjust the working flow rate and pressure of the high self-priming circulating water pump, and connect the jet ejector to the outlet pipeline of the high self-priming circulating water pump. The high self-priming circulating water pump extracts the supernatant liquid in the storage tank, transports it through the pipeline to the jet ejector, and after being ejected from the jet nozzle, returns to the storage tank for recycling.

[0020] S5: The gas generated during the stirring process of the jet ejector is transported to the tail gas purification equipment through the storage tank breathing and exhaust pipeline for purification.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides a set of jet stirring and suspension devices for radioactive waste resin, mud, etc. in a large storage tank. The core device, the jet ejector, has a simple structure, low equipment failure rate, easy replacement of accessories, and simple operation, and can meet the stirring and suspension of radioactive waste resin, mud, etc. in a large storage tank.

[0023] (2) The present invention selects a high self-priming circulating water pump and installs it at the center position of the tank top, which can not only ensure sufficient water pressure at the outlet of the jet nozzle but also meet the requirements of stirring and suspension at the four corners of the tank. The suction pipeline and the return pipeline of the circulating water pump both extend into the large tank through the manhole of the large tank, reducing the openings at the top of the large tank. A filter screen is provided at the suction port of the circulating pump, and the suction port is located above the solid-phase liquid level and below the supernatant liquid level in the tank, effectively preventing the jet ejector from being blocked.

[0024] (3) The present invention adopts a conical convergent low-pressure bidirectional symmetric nozzle design. The nozzle is made of common metal materials, with a simple processing technology. The nozzle diameter can be determined according to the characteristics of the stirred material phase to achieve the requirement of impacting the entire tank to meet the needs of dead-free stirring and a large stirring range. The bidirectional symmetric nozzle inclination design can not only meet the requirement of long-distance spraying but also meet the requirement of solid-phase particle suspension without sedimentation. While the main rotating body rotates, a self-rotating mechanism of the spray nozzle is added, mainly composed of planetary gears, rotating nozzle shafts, etc., ensuring that the spray nozzle can rotate 360 degrees. When the main rotating body rotates, the spray nozzle rotates self-rotatingly, and the rotation speeds of the two are asynchronous, which can overcome the sedimentation of the stirred material phase in water and meet the requirement of stirring suspension.

[0025] (4) In the present invention, 2 to 6 spray nozzles can be flexibly set, which can be set according to the characteristics of the stirred material phase and the size of the storage tank, reasonably distribute the liquid flow rate, reduce the impact on the tank bottom and tank wall, and improve the safety performance.

[0026] (5) In the present invention, the purpose of speed reduction and torque increase is achieved through a two-stage worm and worm gear transmission system, and the power for the rotational stability is provided by controlling the gear torque to ensure the stability of the jet ejector during the working process.

[0027] (6) The gas generated during the jet stirring process of the present invention is transported to the tail gas purification equipment through the large tank exhaust pipe for purification to meet the requirement of the filtered gas meeting the discharge standards. Description of the Drawings

[0028] Figure 1 is the overall external view of the jet ejector in the present invention;

[0029] Figure 2 is the internal partial view of the jet ejector in the present invention;

[0030] Figure 3 is the internal partial view of the jet ejector from another perspective in the present invention;

[0031] Figure 4 is the internal partial view of the jet ejector from another perspective in the present invention;

[0032] Figure 5 is the internal partial view of the jet ejector from another perspective in the present invention;

[0033] Figure 6 is the schematic diagram of the working process of the device provided by the present invention.

[0034] Among them, the names corresponding to the reference numerals are: 1 - interface flange, 2 - mechanical seal, 3 - primary turbine shaft, 4 - scroll impeller, 5 - impeller worm shaft, 6 - main rotary bearing, 7 - main rotating body, 8 - secondary turbine gear, 9 - secondary turbine shaft, 10 - gear sleeve, 11 - planetary gear, 12 - rotary nozzle shaft, 13 - injection nozzle, 14 - nozzle bearing sleeve, 15 - nozzle bearing, 16 - impeller compression screw, 17 - impeller worm shaft bearing, 18 - primary turbine shaft bearing, 19 - primary turbine gear, 20 - secondary turbine shaft bearing, 21 - inner sleeve, 22 - intermediate plate, 23 - device main body, 24 - tertiary gear. Detailed implementation mode

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The implementation modes of the present invention include but are not limited to the following embodiments.

[0036] As Figures 1 to 5 shown, this embodiment provides a device for solid-liquid two-phase stirring and suspension in a large storage tank, including a jet ejector. The jet ejector includes a device main body 23 with a flange interface 1 provided at the lower end. A vertical impeller worm shaft 5 is provided inside the device main body 23. A turbine blade 4 is installed at the lower end of the impeller worm shaft 5. Preferably, in this embodiment, the turbine blade 4 is fixed to the impeller worm shaft 5 by an impeller compression screw 16; a primary turbine gear 19 is meshed with the impeller worm shaft 5, the primary turbine gear 19 is installed on a primary turbine shaft 3, a secondary turbine gear 8 is meshed with the primary turbine shaft 3, and the secondary turbine gear 8 is installed on a secondary turbine shaft 9. The flange interface 1 is connected to the water pipe at the power end to fix the device. The water pipe at the power end rotates the turbine blade 4, and then transmits the power to the impeller worm shaft 5, and then drives the primary turbine gear 19 and the primary turbine shaft 3 to rotate in sequence, and finally transmits the power to the secondary turbine gear 8 and the secondary turbine shaft 9.

[0037] An annular intermediate plate 22 is hermetically arranged at the upper end of the device main body 23. The secondary turbine shaft 9 penetrates through the intermediate plate 22, and a tertiary gear 24 is arranged at the upper end of the secondary turbine shaft 9. A gear sleeve 10 with internal teeth meshing with the tertiary gear 24 is arranged outside the tertiary gear 24, and the outer diameter of the gear sleeve 10 is consistent with that of the intermediate plate 22. A main rotating body 7 is connected above the gear sleeve 10. When the secondary turbine shaft 9 starts to rotate, it drives the tertiary gear 24 thereon to rotate, and then transmits the power to the gear sleeve 10, which drives the main rotating body 7 to rotate. Rotating nozzle shafts 12 are arranged on both sides at the upper end of the main rotating body 7, and spray nozzles 13 are installed at the ends of the rotating nozzle shafts 12. During installation, the two spray nozzles 13 can be set at different installation angles. The rotating nozzle shafts 12 are connected to the main rotating body 7 through nozzle bearings 15, and a nozzle bearing sleeve 14 is arranged outside the nozzle bearings 15. A planetary gear 11 is installed at one end of the rotating nozzle shaft 12 inside the main rotating body 7. An inner sleeve 21 is arranged inside the gear sleeve 10 in cooperation with a main rotating bearing 6. The upper end of the inner sleeve 21 is a gear that can mesh with the planetary gear 11. When the main rotating body 7 rotates, it drives the two rotating nozzle shafts 12 to move horizontally along the gear on the gear sleeve 10. Since the installation angles of the two spray nozzles 13 on the rotating nozzle shafts 12 are different, the two spray nozzles 13 spray jets in different directions to achieve the purpose of suspension stirring.

[0038] During actual use, the flange interface 1 is connected to a water pump, and water flow is relied on as the power. Water enters the device from the flange interface, and the water flow drives the turbine blades 4 to rotate, which in turn drives the impeller worm shaft 5 to rotate. The impeller worm shaft 5 drives the primary turbine, and the primary turbine drives the secondary turbine, achieving the purpose of speed reduction and torque increase through a two-stage turbine worm transmission system. The secondary turbine drives the gear sleeve 10 and the main rotating body 7 to rotate, and the main rotating body 7 drives the two spray nozzles to rotate horizontally by 360 degrees. While the spray nozzles are rotating horizontally, due to the installation angles of the spray nozzles, when the water flow sprays out from the nozzles, the generated reaction force drives the spray nozzles to spin, forming multi-directional jets. To ensure the normal operation of each part inside the device, a sealed installation cavity is arranged inside the device main body 23. The impeller worm shaft 5, the primary turbine shaft 3, the primary turbine gear 19, the secondary turbine shaft 9, and the secondary turbine gear 8 are all arranged in this installation cavity. The impeller worm shaft 5, the primary turbine shaft 3, and the secondary turbine shaft 9 are all connected to the installation cavity through mechanical seals 2 to separate each transmission part from the water environment. In addition, an impeller worm shaft bearing 17 is arranged at the contact between the impeller worm shaft 5 and the installation cavity, a primary turbine shaft bearing 18 is arranged at the contact between the primary turbine shaft 3 and the installation cavity, and a secondary turbine shaft bearing 20 is arranged at the contact between the secondary turbine shaft 9 and the installation cavity to ensure the normal operation of each turbine shaft.

[0039] As Figure 6As shown in the figure, this embodiment also provides a method for using a solid-liquid two-phase stirring and suspension device in a large storage tank, including:

[0040] S1: Open an opening above the storage tank, extend both the suction pipeline and the return pipeline of the high self-priming circulating water pump into the storage tank through the opening. To prevent the solid phase from sucking into the pipeline and blocking the jet injection device, a filter screen is set at the suction port of the high self-priming circulating water pump. The suction port is located above the solid phase liquid level and below the supernatant liquid level in the tank to meet the normal operation requirements of the jet injector.

[0041] S2: The jet injector is installed below the liquid level at the center position of the storage tank to meet the requirements of jet stirring and suspension without dead angles and small air flow disturbance.

[0042] S3: According to the differences in the physical properties of the temporarily stored solid phase in the storage tank, debug the jet injector before operation to determine its installation height and process control parameters.

[0043] S4: The nozzle of the jet injector adopts a bidirectional symmetric design, and its nozzle diameter can be adjusted according to the physical properties of the stirred phase. Open the inlet valve, outlet valve of the high self-priming circulating water pump, start the high self-priming circulating water pump, and open the return valve. Adjust the working flow rate and pressure of the high self-priming circulating water pump. Connect the jet injector to the outlet pipeline of the high self-priming circulating water pump. The high self-priming circulating water pump extracts the supernatant liquid in the storage tank, transports it to the jet injector through the pipeline, and after being ejected from the injection nozzle, it returns to the storage tank for recycling.

[0044] S5: The gas generated during the stirring process of the jet injector is transported to the tail gas purification equipment through the storage tank breathing and exhaust pipeline for purification to meet the requirements of the filtered gas reaching the emission standard.

[0045] The above embodiments are only one of the preferred embodiments of the present invention and should not be used to limit the protection scope of the present invention. Any meaningless changes or polishing made on the main design concept and spirit of the present invention, as long as the technical problems solved are still the same as those of the present invention, should be included in the protection scope of the present invention.

Claims

1. A method for using a device for stirring and suspending solid-liquid two-phases in a large storage tank, characterized in that: include: S1: An opening is opened above the storage tank, and the suction pipeline and return pipeline of the high self-priming circulating water pump are extended into the storage tank through the opening. The suction port of the suction pipeline is located above the solid phase liquid level and below the supernatant liquid level in the tank; S2: Install the jet injector below the liquid level in the storage tank; S3: Debug the jet ejector before operation according to the physical property differences of the temporarily stored solid phase in the storage tank; S4: Start the high self-priming circulating water pump, open the reflux valve, adjust the working flow and pressure of the high self-priming circulating water pump, and connect the jet ejector to the outlet pipeline of the high self-priming circulating water pump; the high self-priming circulating water pump extracts the supernatant in the storage tank, transports it to the jet ejector through the pipeline, and returns to the storage tank for recycling after being ejected by the ejection nozzle; S5: The gas generated during the jet ejector stirring process is transported from the storage tank exhaust pipe to the exhaust gas purification equipment for purification; The device for stirring and suspending solid-liquid two-phases in a large storage tank comprises a jet ejector, the jet ejector comprising a device body (23) with a flange interface (1) arranged at the lower end, a vertical impeller worm shaft (5) arranged in the device body (23), a turbine blade (4) installed at the lower end of the impeller worm shaft (5); a two-stage turbine worm transmission system meshing with the impeller worm shaft (5); a rotating assembly installed at the upper end of the device body (23), the output end of the two-stage turbine worm transmission system connected to the rotating assembly, and a rotating nozzle mechanism connected to the inside of the jet ejector and capable of self-rotation is arranged on the rotating assembly.

2. The method for using the device for solid-liquid two-phase stirring suspension in a large storage tank according to claim 1, characterized in that: The turbine blades (4) are fixed on the impeller worm shaft (5) via an impeller clamping screw (16).

3. The method for using the device for solid-liquid two-phase stirring suspension in a large storage tank according to claim 2, characterized in that: The two-stage turbine worm gear transmission system comprises a first-stage turbine gear (19) meshing with an impeller worm shaft (5), the first-stage turbine gear (19) being mounted on a first-stage turbine shaft (3), a second-stage turbine gear (8) being meshing with the first-stage turbine shaft (3), the second-stage turbine gear (8) being mounted on a second-stage turbine shaft (9), an annular intermediate plate (22) being sealed at the upper end of a device body (23), the second-stage turbine shaft (9) penetrating the intermediate plate (22), and a third-stage gear (24) being arranged at the upper end of the second-stage turbine shaft (9), the third-stage gear (24) being connected to a rotating assembly.

4. The method for using the device for solid-liquid two-phase stirring suspension in a large storage tank according to claim 3, characterized in that: The rotating assembly comprises a gear sleeve (10) arranged outside the third-stage gear (24), the gear sleeve (10) being provided with internal teeth meshing with the third-stage gear (24); a main rotating body (7) is connected above the gear sleeve (10), and a rotating nozzle shaft mechanism is mounted on the main rotating body (7).

5. The method for using the device for solid-liquid two-phase stirring suspension in a large storage tank according to claim 4, characterized in that: The rotating nozzle mechanism comprises a rotating nozzle shaft (12) connected to a main rotating body (7) via a nozzle bearing (15), and a spray nozzle (13) arranged at the end of the rotating nozzle shaft (12); a planetary gear (11) is installed at one end of the rotating nozzle shaft (12) located inside the main rotating body (7), an inner sleeve (21) is arranged in the gear sleeve (10) in cooperation with the main rotating bearing (6), and the upper end of the inner sleeve (21) is a gear that can mesh with the planetary gear (11).

6. The method for using the device for solid-liquid two-phase stirring suspension in a large storage tank according to claim 5, characterized in that: The number of the rotating nozzle mechanisms is 2 to 6.

7. The method for using the device for stirring and suspending solid-liquid two-phases in a large storage tank according to claim 6, characterized in that: A sealed installation cavity is arranged inside the device body (23), and the impeller worm shaft (5), the first-stage turbine shaft (3), the first-stage turbine gear (19), the second-stage turbine shaft (9), and the second-stage turbine gear (8) are all arranged in the installation cavity.

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