Movable boron adding device for preparing boron in nuclear power plant

Abstract

The invention discloses a movable boron adding device for boron preparation of a nuclear power plant, relates to the technical field of operation supply systems, and aims to solve the problems that the boron preparation time is relatively long in the boron preparation operation process of the existing nuclear power plant, boric acid is poured by personnel in high-altitude load-bearing operation, boric acid solid dust splashes, and boric acid powder agglomerates to influence the boron preparation efficiency. The device comprises a boron preparing and dosing device part and a boric acid tank cart, the boron preparing and dosing device part comprises a boron adding bin of a trapezoidal bevel structure, the boron adding bin is further connected with a boron adding bin supporting rod, the bottom of the boron adding bin is connected with a boric acid conveying component through a discharging device, and a variable frequency motor is further arranged between the discharging component and the boric acid conveying component; the boric acid tank is fixed on the roll-over stand of the boric acid tank cart through the clamping and fixing clamp, the roll-over stand is connected with the lifting table through a rotating shaft at the front part of the lifting table, and the lifting table is mounted on the movable frame and can lift on the boric acid tank cart.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of operation and supply system, and particularly relates to a movable boron adding device for boron production in a nuclear power plant. BACKGROUND

[0002] In the reactor boron and water supply system boron production operation: in normal operation, the boric acid solution is prepared in the boric acid solution preparation tank, and the crystalline boric acid and water from the nuclear island desalination water distribution system are stirred uniformly. According to the characteristics that the solubility of boric acid in water increases with the increase of temperature, the preparation tank is provided with an electric heater and a stirrer. During overhaul, the normal loss of boric acid lost during various operations is compensated, or in the case of accidents, transients and unexpected water running during overhaul, a boron water ratio operation is carried out to meet the requirements of technical specifications.

[0003] There are the following problems in the boron production operation process of the nuclear power plant:

[0004] The boron production time is long. Taking the boron production in the boric acid solution preparation tank in normal operation as an example, first, one person needs to fill water to the boric acid solution preparation tank, and another person needs to monitor the liquid level of the boric acid solution preparation tank. When the liquid level reaches a certain height, the other person is contacted through the intercom to close the water filling. After the water filling is completed, boric acid is added to the boric acid solution preparation tank, and a certain amount of boric acid needs to be added for one cycle of boron production. After the electric heater is automatically put into operation, the electric heater starts to light up. When the electric heater starts to light up, the inside of the boric acid solution preparation tank is observed from the addition port. If there is no precipitation, the boron production is completed. However, due to the serious caking of boric acid, after the boric acid is added, the boric acid cannot be dissolved in time, and a large amount of boric acid is accumulated on the filter screen, causing damage to the filter screen and the risk of introducing foreign matter. Since only a small part of the filter screen is submerged in water, the lower part of the caked boric acid cannot be dissolved in time, which will cause the upper part of the boric acid to be dissolved in water, and a lot of time will be spent waiting for the lower part of the caked boric acid to be dissolved in water, which will seriously affect the boron production efficiency. Each time the boron production time is long, and personnel need to carry boric acid multiple times, which is easy to cause personnel fatigue.

[0005] 2. The splashing of boric acid solid dust is not conducive to personnel work. When boric acid is added to the boric acid solution preparation tank, boric acid solid dust smoke is easy to cause, which can be inhaled into the human body, and is not conducive to the health of the boric acid production personnel;

[0006] 3. The caking of boric acid powder affects the boron production efficiency. Due to the hygroscopicity of boric acid, caking is easy to occur during storage in the room and during pouring into the boric acid solution preparation tank. In order to prevent boric acid from caking, two people cooperate to pour boric acid into the basin at the scene and crush it, and then add it to the boric acid solution preparation tank little by little. The boron production efficiency is low, time-consuming and labor-intensive.

[0007] 4. The on-site boric acid solution preparation box is on a high platform, and boric acid needs to be carried to the platform and poured into the boric acid solution preparation box, the space on the platform is narrow, only two people can stand on the platform to pour one bucket of boric acid at a time, a cycle of boric acid preparation needs to add multiple buckets of boric acid, and the boric acid needs to be carried up and down the stairs to the platform multiple times, which is time-consuming and labor-consuming. During the addition of boric acid, due to the inconsistency between the caliber of the boric acid bucket and the caliber of the boric acid solution preparation box, boric acid powder will be spilled around the tank and on the stairs, increasing the risk of slipping and falling. SUMMARY

[0008] The present application aims to provide a movable boric acid adding device for boric acid preparation in a nuclear power plant, which solves the problems of long boric acid preparation time, personnel high-load operation to pour boric acid, boric acid solid dust splashing and boric acid powder caking affecting the boric acid preparation efficiency in the existing boric acid preparation operation process of the nuclear power plant.

[0009] The technical scheme adopted by the present application to solve the technical problems is: a movable boric acid adding device for boric acid preparation in a nuclear power plant, comprising: a boric acid preparation and medicine adding device part and a boric acid tank cart, the boric acid preparation and medicine adding device part comprising: a trapezoidal beveled structure boric acid adding bin, a boric acid adding bin support rod connected to the boric acid adding bin, a boric acid adding bin bottom connected to a boric acid conveying component through a discharging device, and a variable frequency motor provided between the discharging device and the boric acid conveying component; the boric acid tank is fixed on the turnover frame of the boric acid tank cart through a clamping fixing clamp, the turnover frame is connected to the lifting table through the rotating shaft at the front of the lifting table, and the lifting table is installed on the moving frame and can be lifted on the boric acid tank cart.

[0010] The movable boric acid adding device for boric acid preparation in a nuclear power plant, wherein the boric acid adding bin support rod is installed at the four corners of the boric acid adding bin for fixing the boric acid adding bin, and the boric acid adding bin support rod is of a telescopic structure, the height of the boric acid adding bin is adjusted by adjusting the height of the boric acid adding bin support rod.

[0011] The movable boric acid adding device for boric acid preparation in a nuclear power plant, wherein the boric acid conveying component support rod is provided at the lower part of the boric acid conveying component, and the angle of the boric acid conveying component is adjusted by adjusting the height of the boric acid conveying component support rod.

[0012] The movable boric acid adding device for boric acid preparation in a nuclear power plant, wherein the bottom of the boric acid preparation and medicine adding device part is provided with a base, and the base is installed with self-locking moving wheels at the bottom for moving the boric acid preparation and medicine adding device part.

[0013] The movable boric acid adding device for boric acid preparation in a nuclear power plant, wherein the rear side of the boric acid tank cart is provided with an anti-skid handle, and the bottom is provided with universal wheels.

[0014] The movable boron adding device for boron production in a nuclear power plant has the lifting platform connected with the moving frame through a track, a jacking rod arranged between the lifting platform and the moving frame, and the jacking rod connected with a hydraulic device and a lifting lever.

[0015] The movable boron adding device for boron production in a nuclear power plant has a filter screen installed at the inlet of the boron adding bin.

[0016] The movable boron adding device for boron production in a nuclear power plant has a boron acid conveying component including a gear connected with a variable frequency motor, the gear connected with a boron acid conveying pipe of the boron acid conveying component through a lower connecting piece, and the boron acid conveying pipe internally provided with a stirring conveying wheel.

[0017] The movable boron adding device for boron production in a nuclear power plant has an outlet guide pipe arranged at the top of the boron acid conveying pipe, and the outlet guide pipe is a flexible smooth structure and can guide the boron acid from the outlet of the boron acid conveying pipe into the boron acid solution preparation box.

[0018] The movable boron adding device for boron production in a nuclear power plant has a boron acid conveying component with an extension part, the extension part including a boron acid conveying pipe and a stirring conveying wheel matched with the boron acid conveying component, an upper connecting piece arranged at the top of the extension part and connected with a lower connecting piece of the boron acid conveying component, and a combination piece arranged at the bottom of the extension part and capable of being connected with the gear.

[0019] Compared with the prior art, the movable boron adding device for boron production in a nuclear power plant has the following beneficial effects: on the one hand, the structure design reduces the boron acid solid dust splashing; on the other hand, the stirring conveying wheel stirs and grinds the boron acid before entering the boron acid solution preparation box, so that the boron acid powder is prevented from caking, the step of stirring the boron acid powder with a stirring rod during the boron production process is cancelled, and the boron production efficiency is improved. Finally, the boron acid tank cart can facilitate the boron production staff to move and lift the boron acid tank, and can reduce the labor intensity and working time of the boron production staff in carrying and lifting the boron acid tank to the adding opening. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a structural schematic view of a boron production and adding device of the movable boron adding device for boron production in a nuclear power plant;

[0021] Figure 2 Fig. 3 is a structural schematic view of a boron acid tank cart of the movable boron adding device for boron production in a nuclear power plant;

[0022] Figure 3 Fig. 4 is a structural schematic view of a boron acid conveying component of the movable boron adding device for boron production in a nuclear power plant.

[0023] Figure 4 The diagram shown is a schematic representation of an extension of the boric acid delivery component of a movable boron-adding device for boron production in a nuclear power plant, according to the present invention.

[0024] Reference numerals: 1. Boron filling bin; 2. Filter screen; 3. Boron filling bin support rod; 4. Boric acid conveying component; 5. Boric acid conveying component support rod; 6. Base; 7. Self-locking casters; 8. Variable frequency motor; 9. Collection tank; 10. Discharge component; 11. Moving frame; 12. Tilting frame; 13. Fixing clamp; 14. Rotating shaft; 15. Casters; 16. Top rod; 17. Lifting platform; 18. Lifting lever; 19. Anti-slip handle; 20. Boric acid conveying pipe; 21. Outlet guide pipe; 22. Agitator conveying wheel; 23. Lower connector; 24. Gear; 25. Upper connector; 26. Assembly. Detailed Implementation

[0025] To address the problems of long boron production time, heavy-duty work at heights while handling boric acid, and the impact of boric acid dust splashing and powder agglomeration on production efficiency in existing boron production processes at nuclear power plants, this invention provides a mobile boron-adding device for boron production in nuclear power plants. For example... Figures 1-4 As shown, the device includes a boron dosing unit and a boric acid tank trolley. The boron dosing unit includes a trapezoidal beveled-mouth boron dosing chamber 1, which also has a dustproof chamfered structure to reduce the splashing of boric acid solid dust when pouring in. If the splashing of boric acid solid dust is large, a dust cover can be installed on the top of the boron dosing chamber 1. A filter screen 2 is installed at the inlet of the boron dosing chamber 1 to filter the boron powder before it enters the chamber, preventing foreign objects from entering.

[0026] A boron-adding hopper 1 is also connected to a boron-adding hopper support rod 3, which is installed at the four corners of the boron-adding hopper 1 to fix the boron-adding hopper 1. The boron-adding hopper support rod 3 is a telescopic structure, and the height of the boron-adding hopper 1 can be adjusted by adjusting the height of the boron-adding hopper support rod 3. The bottom of the boron-adding hopper 1 is connected to the boric acid conveying component 4 through a discharge component 10. The lower part of the boric acid conveying component 4 is provided with a telescopic boric acid conveying component support rod 5, and the angle of the boric acid conveying component 4 can be adjusted by adjusting the height of the boric acid conveying component support rod 5.

[0027] A variable frequency motor 8 is also installed between the discharge component 10 and the boric acid conveying component 4; the speed of the variable frequency motor 8 is variable, which can control the rate at which the boric acid conveying component 4 adds boron to the boric acid solution preparation tank. A base 6 is installed at the bottom of the boron dosing device. The bottom ends of the boron filling chamber support rod 3 and the boric acid conveying component support rod 5 are connected to the base 6. Self-locking casters 7 are installed under the base 6 for moving the boron dosing device. A collection tank 9 can also be placed on the upper part of the base 6 to collect the residual boric acid in the boron filling chamber 1 and the boric acid conveying component 4 after the boron production process is completed, preventing the boric acid from absorbing moisture and clumping due to long-term storage in the boron dosing device.

[0028] During normal operation, the boric acid conveying component 4 is directly installed on the boron dosing device and driven directly by the variable frequency motor 8. The boric acid conveying component 4 includes a gear 24 connected to the variable frequency motor 8. The gear 24 is connected to the boric acid conveying pipe 20 of the boric acid conveying component 4 via a lower connector 23. An agitator wheel 22 is installed inside the boric acid conveying pipe 20, and the agitator wheel 22 is connected to the gear 24 via the lower connector 23 of the boric acid conveying component 4. The gear 24 is driven by the variable frequency motor 8, and the agitation and conveying speed of the agitator wheel 22 can be controlled by adjusting the speed of the variable frequency motor 8. An outlet guide pipe 21 is provided at the top of the boric acid conveying pipe 20. The outlet guide pipe 21 has a flexible and smooth structure, allowing boric acid to be introduced from the outlet of the boric acid conveying pipe 20 into the boric acid solution preparation tank.

[0029] The boric acid delivery component 4 also has an extension section for extending the delivery height of the boric acid delivery component 4 during boron production to the loading well during overhaul. The extension section includes a boric acid delivery pipe 20 and a stirring delivery wheel 22 that match the boric acid delivery component 4. When it is necessary to extend the boric acid delivery component 4, the lower connector 23 of the boric acid delivery device is detached from the gear 24. The top of the extension section is provided with an upper connector 25 that connects to the lower connector 23 of the boric acid delivery component 4, and the bottom of the extension section is provided with an assembly 26 that can connect to the gear 24.

[0030] Boron production workers move boric acid tanks using a boric acid tank trolley. The boric acid tanks are secured to the trolley's tilting frame 12 using clamping clips 13. The tilting frame 12 is connected to the lifting platform 17 via a rotating shaft 14 at the front of the lifting platform 17. The lifting platform 17 is mounted on a movable frame 11, allowing it to be raised and lowered on the boric acid tank trolley. The lifting platform 17 and the movable frame 11 are connected by a track, with a top rod 16 between them. This top rod 16 is used to secure the bottom of the lifting platform 16 and support the overall weight of the boric acid tank trolley. The top rod 16 is connected to a hydraulic device and a lifting lever 18. The lifting lever 18 drives the hydraulic device to raise and lower the top rod 16, thereby raising and lowering the lifting platform 17 on the movable frame 11. Pressing the lifting lever 18 lifts the boric acid to the boron filling chamber 1 of the boron dosing equipment. The boric acid tank trolley has a non-slip handle 19 at the rear and casters 15 at the bottom.

[0031] Example:

[0032] The boric acid tank movement and dosing process of a mobile boron dosing device for boron production in nuclear power plants according to the present invention is as follows:

[0033] Boron production workers placed the boric acid tank into Figure 2 The boric acid tank is fixed on the tilting frame 12 of the boric acid tank trolley by clamping and fixing clips 13. The boric acid production worker pushes the anti-slip handle 19 to push the boric acid tank trolley and move the boric acid tank to the side of the boric acid production and dosing device. The boric acid tank trolley is equipped with casters 15, which can change the direction of movement during the pushing process.

[0034] After moving the boric acid tank trolley to the side of the boron dosing device, repeatedly press down the lifting lever 18. Under the action of the hydraulic device, the push rod 16 is raised, causing the lifting platform 17 to rise. When the lifting platform 17 is raised to the same height as the boron filling chamber 1 of the boron dosing device, stop pressing down the lifting lever 18. Rotate the tilting frame 12 towards the boron filling chamber 1 along the rotating shaft 14. When the boric acid tank on the tilting frame 12 can pour boric acid into the boron filling chamber 1, reduce the tilting speed until the boric acid powder in the boric acid tank is completely poured into the boron filling chamber 1. The height of the boron filling chamber 1 can be adjusted by the height of the boron filling chamber support rod 3.

[0035] Normal boron preparation and dosing procedure:

[0036] During normal boron production, the boron dosing device is placed in the room where the boric acid solution preparation tank is located. After adding boric acid powder to the boron dosing chamber 1, clean the foreign matter from the filter screen 2, and check the base 6 and self-locking casters 7 before fixing them in the appropriate position. After aligning the boric acid conveying component 4 and the outlet guide pipe 21 with the boric acid solution preparation tank, turn on the power to the variable frequency motor 8 and start the variable frequency motor 8. The variable frequency motor 8 drives the stirring conveying wheel 22 through the gear 24. Under the stirring of the stirring conveying wheel 22, the boric acid powder is lifted in the boric acid conveying pipe 20 to the outlet guide pipe 21 and enters the boric acid solution preparation tank along the outlet guide pipe 21. During the boron production process, the speed of the variable frequency motor 8 can be adjusted according to the boron production rate. When the boric acid powder in the boron dosing chamber 1 is consumed, if it is necessary to continue boron production, the boric acid tank movement and dosing process is repeated to add more boron to the boron dosing chamber 1.

[0037] Cleaning process for boron dosing equipment:

[0038] After the boron dosing is completed, the boron dosing chamber 1 needs to be cleaned. The discharge component 10 is connected to the bottom of the dosing chamber 1. During normal operation, the discharge component 10 is in a closed state to ensure the airtightness of the boron dosing device. When cleaning the boron dosing chamber 1, the discharge component 10 is opened to discharge the remaining boric acid in the dosing chamber 1 and the boric acid conveying component 4 into the collection tank 9.

[0039] It should be noted that the combination of the technical features in the embodiments of the present invention is not limited to the combination methods described in the embodiments of the present invention or the combination methods described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way, unless there is a contradiction between them.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable boron-adding device for boron production in nuclear power plants, characterized in that, The device includes a boron dosing device and a boric acid tank trolley. The boron dosing device includes a trapezoidal inclined structure boron dosing chamber (1), a boron dosing chamber support rod (3) connected to the boron dosing chamber (1), the bottom of the boron dosing chamber (1) being connected to the boric acid conveying component (4) via a discharge device (10), and a variable frequency motor (8) being provided between the discharge component (10) and the boric acid conveying component (4). The boric acid tank is fixed on the tilting frame (12) of the boric acid tank trolley by a clamping clamp (13). The tilting frame (12) and the lifting platform (17) are connected by a rotating shaft (14) at the front of the lifting platform (17). The lifting platform (17) is mounted on a movable frame (11) and can be lifted and lowered on the boric acid tank trolley.

2. The portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, The boron filling chamber support rod (3) is installed at the four corners of the boron filling chamber (1) to fix the boron filling chamber (1). The boron filling chamber support rod (3) is a telescopic structure, and the height of the boron filling chamber (1) can be adjusted by adjusting the height of the boron filling chamber support rod (3).

3. A portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, The lower part of the boric acid conveying component (4) is provided with a retractable boric acid conveying component support rod (5), and the angle of the boric acid conveying component (4) can be adjusted by adjusting the height of the boric acid conveying component support rod (5).

4. A portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, The bottom of the boron dosing device is provided with a base (6), and a self-locking caster (7) is installed under the base (6) for moving the boron dosing device.

5. A portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, The boric acid tank trolley is equipped with a non-slip handle (19) on the rear side and casters (15) on the bottom.

6. A portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, The lifting platform (17) and the movable frame (11) are connected by a track, and a top rod (16) is provided between them. The top rod (16) is connected to a hydraulic device and a lifting lever (18). Under the action of the lifting lever (18), the hydraulic device is driven to make the top rod (16) rise and fall, thereby driving the lifting platform (17) to rise and fall on the movable frame (11).

7. A portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, A filter screen (2) is installed at the inlet of the boron filling chamber (1).

8. A portable boron-adding device for boron production in nuclear power plants according to claim 1, characterized in that, The boric acid conveying component (4) includes a gear (24) connected to a variable frequency motor (8). The gear (24) is connected to the boric acid conveying pipe (20) of the boric acid conveying component (4) through a lower connector (23). A stirring conveying wheel (22) is provided inside the boric acid conveying pipe (20).

9. A portable boron-adding device for boron production in nuclear power plants according to claim 8, characterized in that, The top of the boric acid delivery pipe (20) is provided with an outlet guide pipe (21). The outlet guide pipe (21) has a flexible and smooth structure, which can introduce boric acid from the outlet of the boric acid delivery pipe (20) into the boric acid solution preparation tank.

10. A portable boron-adding device for boron production in nuclear power plants according to claim 8, characterized in that, The boric acid conveying component (4) has an extension, which includes a boric acid conveying pipe (20) and a stirring conveying wheel (22) that are matched with the boric acid conveying component (4). The top of the extension is provided with an upper connector (25) that is connected to the lower connector (23) of the boric acid conveying component (4), and the bottom of the extension is provided with an assembly (26) that can be connected to the gear (24).

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