Full-automatic vacuum metering and conveying system for borate powder in non-nuclear area of nuclear power plant

Abstract

The utility model discloses a nuclear power plant non-nuclear area boric acid powder full -automatic vacuum metering conveying system relates to conveying system technical field, include: crushing device for the crushing of material, metering device, and the discharge end of crushing device is connected to the feeding end, is used for the metering of material, reaction kettle, and the discharge end of metering device is connected to the feeding end, is used for receiving material and carries out the reaction, vacuum pump, with metering device and reaction kettle intercommunication, is used for providing vacuum environment. The conveying system of the utility model has simple operation step, equipment operation is reliable, work efficiency is high and can continuous operation etc. advantage, has reduced the labor intensity of operator, improved work environment, saved manpower cost.

Description

Technical Field

[0001] This utility model relates to the field of conveying system technology, and in particular to a fully automatic vacuum metering and conveying system for boric acid powder in non-nuclear areas of nuclear power plants. Background Technology

[0002] Nuclear energy is an important energy source because it has advantages over traditional fossil fuels such as coal, oil, and natural gas, including lower pollutant emissions, higher energy concentration, and larger available resources. Compared to other renewable and clean energy sources such as hydropower, solar power, wind power, and biomass, nuclear energy also has advantages such as higher energy concentration and relatively flexible development locations. With the gradual depletion of traditional fossil fuels and increasing environmental protection requirements, nuclear power generation is now widely used worldwide.

[0003] Currently, most nuclear power plants use boric acid solutions to control the reaction rate of nuclear reactors and protect the safety of the plant. In the initial stages of operation, large quantities of boric acid solution are typically required for nuclear fuel reserves, fuel safety assurance, and initial operation of the primary circuit. In my country's mainstream pressurized water reactor nuclear power plants, a single unit requires approximately 3000 cubic meters of high-precision boric acid solution with a mass concentration of about 4.0-4.75%. This boric acid solution is prepared by adding high-purity nuclear-grade boric acid solid powder to high-purity demineralized water. Therefore, the workload for boric acid solution preparation is enormous. Traditional nuclear power plant boric acid solution preparation equipment suffers from drawbacks such as low automation, cumbersome operation procedures, poor equipment reliability, high manpower requirements, and harsh working environments, making it unable to meet current production needs. Utility Model Content

[0004] Based on the technical problems existing in the background technology, this utility model proposes a fully automatic vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant. It has the advantages of simple operation steps, reliable equipment operation, high work efficiency and continuous operation, which reduces the labor intensity of operators, improves the working environment and saves labor costs.

[0005] This utility model proposes a fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant, comprising:

[0006] A crushing device used for crushing materials;

[0007] A metering device, with its feed end connected to the discharge end of the crushing device, is used for measuring materials;

[0008] The reactor, with its feed end connected to the discharge end of the metering device, is used to receive materials and carry out the reaction.

[0009] A vacuum pump, connected to the metering device and the reaction vessel, is used to provide a vacuum environment.

[0010] Preferably, the crushing device includes a crushing chamber, a dust removal fan is provided above the crushing chamber, a feed inlet is provided on one side of the crushing chamber, a crushing device is provided at the lower end of the crushing chamber, and a first emptying device is connected to the discharge end of the crushing device.

[0011] Preferably, the first emptying device includes a connecting pipe, and the connecting pipe is provided with an air supply valve, a shut-off valve and an emptying valve in sequence along the conveying direction.

[0012] Preferably, a first backflushing device is connected to the upper end of the crushing chamber.

[0013] Preferably, the metering device includes a mounting frame, the mounting frame is provided with a weighing bin and a vibrating screen, the weighing bin is located below the vibrating screen, the upper end of the vibrating screen is connected to a feeding bin, the feeding end of the feeding bin is connected to the discharge end of the crushing device, a plurality of weighing devices are provided between the weighing bin and the mounting frame in a uniform circumferentially distributed manner, and the discharge end of the weighing bin is provided with a screw conveyor.

[0014] Preferably, the screw conveyor is provided with a buffer bin at the discharge end, and the discharge end of the buffer bin is connected to a second emptying device.

[0015] Preferably, the feeding hopper is equipped with a second vibrator and a second backflushing device.

[0016] Preferably, the weighing bin is also equipped with a fluidizing device.

[0017] The beneficial technical effects of this utility model are as follows:

[0018] (1) This utility model integrates crushing, metering, conveying and reaction vessel feeding into the same system. By combining vacuum conveying and automatic weighing, it realizes full automation of boric acid powder from raw material feeding to feeding reaction, greatly reducing manual operation links, reducing labor intensity, and improving production continuity and safety.

[0019] (2) This utility model uses a weighing bin and a uniformly distributed weighing device in conjunction with a screw conveyor to ensure that the feeding accuracy meets the requirements of the boric acid solution concentration control of the nuclear power plant, and avoids batch deviation caused by manual weighing, thereby improving the stability of the boric acid solution concentration and the safety of nuclear reactor operation.

[0020] (3) The dust removal fan is equipped above the crushing chamber of this utility model. Combined with the first back-blowing device and the second back-blowing device, it effectively suppresses the escape of dust during the crushing and feeding process, reduces the inhalation hazard of boric acid powder to operators, significantly improves the working environment, and meets the occupational health and safety standards of non-nuclear areas of nuclear power plants.

[0021] (4) The present invention provides a second vibrator on the feeding hopper and a fluidization device on the weighing hopper, which effectively prevents the blockage caused by deliquescence or accumulation of boric acid powder, ensures the continuous flow of materials during crushing, metering and vacuum conveying, and improves conveying efficiency and equipment operation stability.

[0022] (5) Both the first and second emptying devices of this utility model are equipped with a gas replenishment valve, a stop valve and an emptying valve along the material conveying path, which can quickly empty the residual material when the batch ends or when maintenance is required, avoid cross-contamination between batches, shorten the switching time and improve the equipment utilization rate.

[0023] (6) A vacuum pump is used to provide a closed conveying environment, so that the boric acid powder is completely sealed during the conveying process, avoiding direct contact between operators and powder, reducing the risk of chemical exposure, and reducing the possibility of powder absorbing moisture and clumping, thereby improving the stability of material quality and the reliability of conveying. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant proposed in this utility model.

[0025] Figure 2 This is a schematic diagram of the pulverizing device proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the first emptying device proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the weighing device proposed in this utility model.

[0028] In the diagram: 1-Pulverizing device, 11-Pulverizing bin, 12-First backflushing device, 13-Dust removal fan, 14-Feed inlet, 15-First vibrator, 16-Crushing device, 17-First emptying device, 171-Connecting pipe, 172-Air replenishment valve, 173-Stop valve, 174-Emptying valve, 2-Metering device, 21-Weighing bin, 211-Fluidization device, 22-Mounting frame, 23-Second backflushing device, 24-Feeding bin, 241-Second vibrator, 25-Vibrating screen, 26-Weighing device, 27-Screw conveyor device, 28-Buffer bin, 29-Second emptying device, 3-Reaction vessel, 4-Vacuum pump. Detailed Implementation

[0029] The present invention will be further explained below with reference to specific embodiments.

[0030] Reference Figure 1 The present invention proposes a fully automatic vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant, comprising a crushing device 1, a metering device 2, a reaction vessel 3, and a vacuum pump 4.

[0031] Crushing device 1 is used for crushing materials. Since boric acid powder tends to clump, it is necessary to crush the clumped boric acid powder using a crushing device. The crushing device can adopt an existing crushing structure.

[0032] Metering device 2, with its feed end connected to the discharge end of crushing device 1, is used for measuring materials. The weighing device is designed to improve the precise control of the amount of boric acid added to the reactor, ensure that the feeding accuracy meets the boric acid solution concentration control requirements of the nuclear power plant, avoid batch deviations caused by manual weighing, and thus improve the stability of boric acid solution concentration and the safety of nuclear reactor operation.

[0033] The reactor 3 has its feed end connected to the discharge end of the metering device 2, and is used to receive materials and carry out the reaction.

[0034] Vacuum pump 4, connected to metering device 2 and reaction vessel 3, is used to provide a vacuum environment.

[0035] Reference Figure 2 In this embodiment, the pulverizing device 1 includes a pulverizing chamber 11, a dust removal fan 13 is installed above the pulverizing chamber 11, a feed inlet 14 is installed on one side of the pulverizing chamber 11, and a crushing device 16 is installed at the lower end of the pulverizing chamber 11. The discharge end of the crushing device 16 is connected to a first emptying device 17. The crushing device 16 mainly achieves the crushing of boric acid powder by driving two cooperating crushing rollers with a motor. The particle size of the crushed boric acid powder can be controlled by designing the parameters of the crushing rollers. In this embodiment, the crushing particle size of the crushing device is designed to be ≤2mm.

[0036] Reference Figure 3 The first emptying device 17 includes a connecting pipe 171, and the connecting pipe 171 is sequentially equipped with an air replenishment valve 172, a shut-off valve 173, and an emptying valve 174 along the conveying direction. Through the design of the first emptying device 17, residual materials can be quickly emptied when a batch ends or when maintenance is required, avoiding cross-contamination between batches, shortening the changeover time, and improving equipment utilization.

[0037] To prevent dust pollution, a first backflushing device 12 is connected to the upper end of the crushing chamber 11. Through the combined action of the first backflushing device and the dust removal fan, dust escape can be effectively suppressed during the material crushing process, reducing the inhalation hazards of boric acid powder to operators, significantly improving the working environment, and meeting the occupational health and safety standards for non-nuclear areas of nuclear power plants.

[0038] Reference Figure 4In this embodiment, the metering device 2 includes a mounting frame 22, which is provided with a weighing bin 21 and a vibrating screen 25. The weighing bin 21 is located below the vibrating screen 25. The upper end of the vibrating screen 25 is connected to a feeding bin 24. The feeding end of the feeding bin 24 is connected to the discharge end of the crushing device 1. A plurality of metering devices 26 are evenly distributed circumferentially between the weighing bin 21 and the mounting frame 22. The discharge end of the weighing bin 21 is provided with a screw conveyor 27.

[0039] In addition, a buffer bin 28 is provided at the discharge end of the screw conveyor 27, and a second emptying device 29 is connected to the discharge end of the buffer bin 28. The structure of the second emptying device 29 is the same as that of the first emptying device 17.

[0040] When adding materials, the materials are conveyed from the weighing bin 21 to the buffer bin 28 by the screw conveyor 27. When the weighing device detects that the amount of material reduction in the weighing bin 21 has reached the preset value, the screw conveyor 27 is turned off, thus completing one precise addition of materials. The materials in the buffer bin 28 are then conveyed to the reactor for reaction.

[0041] For the weighing device in this embodiment, existing technology can be used. In this embodiment, the weighing device integrates a Mettler Toledo high-precision weighing module (range 0.5-5 tons, linear error ±0.1%FS). The weighing device is electrically connected to the control module, and automatically measures the weight of the conveyed boric acid powder according to the set value and the technology between the weighing module instrument.

[0042] In this embodiment, there are certain gaps between the weighing bin 21 and the vibrating screen 25, and between the screw conveyor 27 and the buffer bin 28. Therefore, the weighing device mainly weighs the total weight of the weighing bin 21, the screw conveyor 27, and the raw materials located in the weighing bin 21.

[0043] In this embodiment, a second vibrator 241 and a second back-blowing device 23 are provided on the feeding hopper 24. The second vibrator 241 ensures the feeding of materials, and the second back-blowing device 23 has the same function as the first back-blowing device 12, which can suppress the escape of dust during the feeding process.

[0044] In this embodiment, a fluidizing device 211 is also provided on the weighing bin 21, which can prevent uneven feeding caused by material accumulation or blockage, ensure that the weighing device can accurately measure the weight of the material, and avoid measurement errors caused by material retention.

[0045] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application. The scope of this application is defined by the appended claims and their equivalents, all of which should be included within the protection scope of this application.

Claims

1. A fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant, characterized in that, include: A crushing device (1) is used for crushing materials; Metering device (2), the feed end of which is connected to the discharge end of crushing device (1), is used for measuring materials; The reactor (3) has its feed end connected to the discharge end of the metering device (2) for receiving materials and carrying out the reaction. A vacuum pump (4) is connected to the metering device (2) and the reactor (3) to provide a vacuum environment.

2. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 1, characterized in that, The crushing device (1) includes a crushing chamber (11), a dust removal fan (13) is provided above the crushing chamber (11), a feed inlet (14) is provided on one side of the crushing chamber (11), a crushing device (16) is provided at the lower end of the crushing chamber (11), and a first emptying device (17) is connected to the discharge end of the crushing device (16).

3. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 2, characterized in that, The first emptying device (17) includes a connecting pipe (171), and the connecting pipe (171) is provided with an air replenishment valve (172), a shut-off valve (173) and an emptying valve (174) in sequence along the conveying direction.

4. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 2, characterized in that, The upper end of the crushing chamber (11) is connected to a first backflushing device (12).

5. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 1, characterized in that, The metering device (2) includes a mounting frame (22), which is equipped with a weighing bin (21) and a vibrating screen (25). The weighing bin (21) is located below the vibrating screen (25). The upper end of the vibrating screen (25) is connected to a feeding bin (24). The feeding end of the feeding bin (24) is connected to the discharge end of the crushing device (1). A number of weighing devices (26) are evenly distributed circumferentially between the weighing bin (21) and the mounting frame (22). A screw conveyor (27) is provided at the discharge end of the weighing bin (21).

6. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 5, characterized in that, The screw conveyor (27) is provided with a buffer bin (28) at the discharge end, and the discharge end of the buffer bin (28) is connected to a second emptying device (29).

7. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 5, characterized in that, The feeding hopper (24) is equipped with a second vibrator (241) and a second backflushing device (23).

8. The fully automated vacuum metering and conveying system for boric acid powder in the non-nuclear area of ​​a nuclear power plant according to claim 5, characterized in that, The weighing chamber (21) is also equipped with a fluidizing device (211).

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