Box-type radioactive waste oil curing device

Abstract

A box type radioactive waste oil curing device is mainly used for radioactive waste oil liquid treatment and comprises a container, an airtight door, a waste oil storage tank, a waste oil weighing bin, a curing agent weighing bin, a spiral kneading device, a nitrogen injection device, a conveying table and a negative pressure suction machine. A combustible substance detection device, a pipeline connected with an external nitrogen injection system and a pipeline connected with an external negative pressure suction machine are respectively arranged on the side walls of the box; the waste oil storage tank is arranged outside the container and is connected with the internal waste oil weighing bin through a pipeline; a spiral kneading device in the container is connected with a curing agent weighing bin and a waste oil weighing bin through pipelines; a pipeline outlet end at the bottom of the spiral kneading device is aligned with the top of the bottom-opened steel drum; the steel drums are installed on a set of conveying tables, the conveying tables extend to the airtight door, and a cover sealing device is arranged above the conveying tables, close to the airtight door, in the container. The device has the characteristics of good sealing effect, safety and reliability.

Description

Technical Field

[0001] This utility model relates to a curing device, which is mainly used for the treatment of radioactive waste oil liquid. Background Technology

[0002] During normal operation, nuclear power plants generate a certain amount of radioactive waste oil, mainly consisting of insulating oil, lubricating oil, and hydraulic oil. Since nuclear power plants are production and operation units, they generally lack the capacity to process this waste oil and must typically send it for external treatment. Because radioactive waste oil is classified as liquid radioactive waste, it cannot be transported directly and must be converted into a solid (non-dispersed state) before transportation. Therefore, developing a waste oil solidification device is urgently needed by many nuclear power plants.

[0003] An existing patent (application number: CN202410693118.0) discloses a device and method for solidifying radioactive waste oil. The device includes a frame; an adsorption feeding mechanism fixed to the frame for adsorbing and conveying radioactive waste oil; a stirring mechanism fixed to the frame and located on one side of the adsorption feeding mechanism for mixing the radioactive waste oil and a solidifying agent to form a solidified body; a solidification feeding mechanism fixed to the frame and located on one side of the stirring mechanism for conveying the solidifying agent; and a conveying mechanism fixed to the frame and located at one end of the stirring mechanism for conveying the solidified body output by the stirring mechanism to a packaging container. This invention improves the safety of the radioactive waste oil solidification process. However, this device has the problem that radioactive substances such as waste liquid can easily spill out during the solidification and mixing process. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a box-type radioactive waste oil solidification device with good sealing performance and high safety and reliability.

[0005] Specifically, it is implemented as follows: a box-type radioactive waste oil solidification device includes a container, an airtight door, a waste oil storage tank, a waste oil weighing bin, a solidifying agent weighing bin, a spiral kneading device, a nitrogen injection device, a conveyor table, and a negative pressure suction machine. The airtight door is installed on the side wall of the container. A combustible material detection device, a pipe connected to an external nitrogen injection system, and a pipe connected to an external negative pressure suction machine are respectively installed on the side wall of the container. The waste oil storage tank is located outside the container and is connected to the internal waste oil weighing bin via a pipe, on which a diaphragm pump is installed. The spiral kneading device inside the container is connected to the internal waste oil weighing bin via a pipe... The container is connected to a weighing hopper for the curing agent. This hopper is equipped with a conveying device and a discharge valve. Another hopper connects to a screw kneading device and a waste oil weighing hopper, and is also equipped with a discharge valve. The top cover of the screw kneading device has a hopper that connects to the outside of the container, and is equipped with a suction device. The bottom of the screw kneading device has a discharge motor and a hopper with a discharge valve. The outlet of the hopper is aligned with the top of the bottom-opening steel drum. The steel drum is mounted on a set of conveyor platforms that extend to the airtight door. An external conveyor platform connects to the outside of the airtight door. Inside the container, near the airtight door, above the conveyor platform, is a capping device.

[0006] Radioactive waste oil from the waste oil storage tank is pumped into the waste oil weighing hopper via a diaphragm pump and quantitatively added to the spiral kneading device. Simultaneously, the curing agent weighing hopper begins quantitatively adding curing agent, which is then added into the spiral kneading device via a transmission device driven by a drive motor. At this time, the suction device is activated to extract and filter out the radioactive aerosols inside the device. Meanwhile, after the waste oil and curing agent mix and react inside the device, the discharge valve at the bottom of the spiral kneading device is activated to discharge the mixture into the steel drum below. Once full, the discharge valve closes, the conveyor is activated, and the steel drum is transferred to the sealing device for sealing. After sealing, the airtight door is opened, and the sealed steel drum is transferred to the conveyor outside the container for transport. Throughout the process, the negative pressure suction machine outside the container is activated to maintain the pressure inside the container at approximately -100Pa to prevent internal gas from escaping. At the same time, the combustible material detection device is activated. If the concentration of combustible materials inside the container is too high, the nitrogen injection system is activated to replace the gas inside the container.

[0007] Furthermore, the spiral kneading device has a conical structure with a rotating device on the outer wall at the bottom. The rotating device is equipped with a liquid receiving tray to prevent the remaining mixture in the collection pipe from falling into the conveyor table after the upper discharge valve is closed.

[0008] Furthermore, the airtight door is equipped with a sliding door device, an opening button, a spare opening button, a closing button, and a spare closing button.

[0009] Furthermore, a weighing sensor is installed on the curing agent weighing chamber.

[0010] Furthermore, a drive motor is installed on the conveyor.

[0011] Furthermore, the conveyor platform is equipped with rotating rollers, a rotating motor, and control switches.

[0012] Furthermore, a stirring motor is installed at the top of the spiral kneading device, which is connected to the internal propeller via a connecting rod.

[0013] Furthermore, the spiral kneading device is equipped with a heating device to control the temperature of the mixed liquid, facilitating curing.

[0014] Furthermore, an iodine adsorption device is installed on the pipe at the outlet end of the suction device and the negative pressure suction machine.

[0015] The beneficial effects of this utility model are:

[0016] 1. By simplifying the process of mixing waste oil and solidifying agent and loading it into steel drums, the operational risks can be effectively reduced. There is no high temperature or high pressure operation, which minimizes the possibility of combustion or explosion caused by high temperature and high pressure operation during the treatment process.

[0017] 2. Install a negative pressure suction device to ensure negative pressure inside the chamber and prevent radioactive aerosols from drifting to the outside.

[0018] 3. By solidifying liquid waste oil, the requirements for solid radioactive waste treatment and transportation can be met.

[0019] 4. The device is designed as a sealed container structure, which facilitates sealing management and equipment transportation.

[0020] 5. Installing a liquid receiving device can reduce the amount of mixture remaining in the pipeline falling out after the valve is closed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the device.

[0022] Figure 2 This is a top view of the device.

[0023] In the diagram: 1 Container, 2 Airtight Door, 2-1 Sliding Door Device, 2-2 Door Opening Button, 2-3 Spare Door Opening Button, 2-4 Door Closing Button, 2-5 Spare Door Closing Button, 3 Diaphragm Pump, 4 Waste Oil Storage Tank, 5 Waste Oil Weighing Bin, 6 Curing Agent Weighing Bin, 6-1 Weighing Sensor, 6-2 Drive Motor, 7 Spiral Kneading Device, 7-1 Agitator Motor, 7-2 Propeller, 7-3 Discharge Motor, 8 Steel Drum, 9 Sealing Device, 10 Conveying Device, 11 Suction Device, 12 Iodine Filter Device, 13 Nitrogen Injection System, 14 Combustible Material Detection Device, 15 Conveying Table, 16 Rotating Roller, 16-1 Rotating Motor, 16-2 Control Switch, 17 Negative Pressure Suction Machine, 18 Heating Device, 19 Discharge Valve, 20 Pipeline, 21 Rotating Device, 22 Liquid Receiving Tray. Detailed Implementation

[0024] Example

[0025] like Figure 1 , Figure 2 As shown, the specific implementation is as follows: a box-type radioactive waste oil solidification device includes a container 1, an airtight door 2, a waste oil storage tank 4, a waste oil weighing bin 5, a solidifying agent weighing bin 6, a spiral kneading device 7, a nitrogen injection device 13, a conveyor 15, and a negative pressure suction machine 17. The airtight door 2 is installed on the side wall of the container 1, and the airtight door 2 is equipped with a sliding door device 2-1, an opening button 2-2, a spare opening button 2-3, a closing button 2-4, and a spare closing button 2-5. A combustible material detection device 14, a pipe 20 connected to the external nitrogen injection system 13, and a pipe 20 connected to the external negative pressure suction machine 17 are respectively installed on the side wall of the container 1. An iodine adsorption device 12 is installed on the pipe 20 at the outlet end of the negative pressure suction machine 17. The waste oil storage tank 4 is outside the container 1, and is connected to the external nitrogen injection system 13 via a spiral kneading device 7. Pipeline 20 connects to the internal waste oil weighing bin 5, and a diaphragm pump 3 is installed on pipeline 20. Inside container 1, the spiral kneading device 7 is connected to the curing agent weighing bin 6 via pipeline 20. Pipeline 20 is equipped with a conveying device 10 and a discharge valve 19. A weighing sensor 6-1 is installed on the curing agent weighing bin 6, and a drive motor 6-2 is installed on the conveying device 10. Another pipeline 20 connects the spiral kneading device 7 and the waste oil weighing bin 5, and a discharge valve 19 is installed on this pipeline. The spiral kneading device 7 has a conical structure with a rotating device 21 on its outer wall at the bottom. The rotating device 21 has a liquid receiving tray 22 to prevent the remaining mixture in the collection pipeline from falling into the conveyor table 15 after the upper discharge valve 19 is closed. A pipeline 20 on the top cover of the spiral kneading device 7 connects to the outside of the container, and a suction device 11 is installed on pipeline 20. An iodine adsorption device 12 is installed on the pipe 20 at the outlet end of the suction device 11; a stirring motor 7-1 is installed on the top of the spiral kneading device 7, which is connected to the internal propeller 7-2 via a connecting rod; a heating device 18 is installed on the spiral kneading device 7 to control the temperature of the mixed liquid and facilitate solidification; a feeding motor 7-3 and a pipe 20 are installed at the bottom of the spiral kneading device 7, and a feeding valve 19 is installed on the pipe 20, with the outlet end of the pipe 20 aligned with the top of the bottom-opening steel drum 8; the steel drum 8 is installed on a set of conveyor platforms 15, which extend to the airtight door 2, and an external conveyor platform 15 is connected to the outside of the airtight door 2; a sealing device 9 is installed on the conveyor platform 15 inside the container 1 near the airtight door 2; a rotating roller 16, a rotating motor 16-1, and a control switch 16-2 are installed on the conveyor platform 15.

[0026] Radioactive waste oil in waste oil storage tank 4 is pumped into waste oil weighing hopper 5 via diaphragm pump 3 and quantitatively added to spiral kneading device 7. At the same time, curing agent weighing hopper 6 begins quantitatively adding curing agent, which is then added into spiral kneading device 7 via transmission motor 6-2 driving conveyor device 10. At this time, suction device 11 is activated to extract and filter out radioactive aerosols inside the device. Simultaneously, after the waste oil and curing agent mix and react inside the device, the discharge valve 19 at the bottom of spiral kneading device 7 is activated to discharge the mixture into the steel drum below. In step 8, after the filling is complete, the discharge valve 19 is closed, the conveyor 15 is started, and the steel drum 9 is transferred to the sealing device 9 for sealing. Then the airtight door 2 is opened, and the sealed steel drum 8 is transferred to the conveyor outside the container for transport. Throughout the process, the negative pressure suction machine 17 outside the container 1 is turned on to maintain the pressure inside the container at about -100Pa to prevent the internal gas from escaping. At the same time, the combustible material detection device 14 is turned on. If the concentration of combustible material inside the container is too high, the nitrogen injection system 13 is turned on to replace the gas inside the container.

Claims

1. A container-type radioactive waste oil solidification device, comprising a container, an airtight door, a waste oil storage tank, a waste oil weighing bin, a solidifying agent weighing bin, a spiral kneading device, a nitrogen injection device, a conveyor table, and a negative pressure suction machine, wherein the airtight door is installed on the side wall of the container, characterized in that: The container sidewalls are equipped with a combustible material detection device, a pipe connected to an external nitrogen injection system, and a pipe connected to an external negative pressure suction machine. The waste oil storage tank is located outside the container and is connected to the internal waste oil weighing silo via a pipe, which is equipped with a diaphragm pump. Inside the container, a screw kneading device is connected to a solidifying agent weighing silo via a pipe, which is equipped with a conveying device and a discharge valve. Another pipe connects the screw kneading device and the waste oil weighing silo, and is equipped with a discharge valve. The top cover of the screw kneading device has a pipe connecting to the outside of the container, and a suction device is installed on the pipe. The bottom of the screw kneading device has a discharge motor and a pipe, which is equipped with a discharge valve. The outlet end of the pipe is aligned with the top of the bottom-opening steel drum. The steel drum is mounted on a set of conveyor platforms, which extend to the airtight door. An external conveyor platform is connected to the airtight door. Inside the container, near the airtight door, a cover device is installed above the conveyor platform.

2. The box-type radioactive waste oil solidification device according to claim 1, characterized in that: The spiral kneading device has a conical structure with a rotating device on the outer wall at the bottom and a liquid receiving tray on the rotating device.

3. The box-type radioactive waste oil solidification device according to claim 1, characterized in that: The airtight door is equipped with a sliding door device, an opening button, a spare opening button, a closing button, and a spare closing button.

4. A box-type radioactive waste oil solidification device according to claim 1, characterized in that: A weighing sensor is installed on the curing agent weighing bin.

5. A box-type radioactive waste oil solidification device according to claim 1, characterized in that: The conveyor is equipped with a drive motor.

6. A box-type radioactive waste oil solidification device according to claim 1, characterized in that: The conveyor is equipped with rotating rollers, a rotating motor, and control switches.

7. A box-type radioactive waste oil solidification device according to claim 1, characterized in that: The top of the spiral kneading device is equipped with a stirring motor, which is connected to the internal propeller via a connecting rod.

8. A box-type radioactive waste oil solidification device according to claim 1, characterized in that: The spiral kneading device is equipped with a heating device.

9. A box-type radioactive waste oil solidification device according to claim 1, characterized in that: An iodine adsorption device is installed on the pipe at the outlet of the suction device and the negative pressure suction machine.

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