A reactor boron and water supply system

Abstract

The present invention discloses a reactor boron and water supply system, including a main controller, a boron holding tank for holding boron powder, a primary water holding tank, and a primary mixing tank, wherein the primary mixing tank is provided with a primary stirring mechanism, and further comprising a secondary water storage tank and a secondary mixing tank, wherein the output ends of the primary mixing tank and the secondary water storage tank are respectively connected to the input end of the secondary mixing tank through a pipeline, and a third flow control valve and a fourth flow control valve are respectively provided on the pipeline, and the output end of the secondary mixing tank is provided with a first delivery pump, and the output end of the first delivery pump is connected to the reactor coolant system through a pipeline. By providing two mixing tanks, the primary mixing tank and the secondary mixing tank, boron can be mixed and prepared twice, with higher mixing quality, more efficient mixing, and more uniform mixing.

Description

[Technical field]

[0001] The present invention relates to the technical field of nuclear power plant operating equipment, in particular to the technical field of reactor boron and water replenishment systems. [Background technology]

[0002] When a pressurized water reactor nuclear power plant is in operation, boron is usually added to the primary coolant to improve the economy and safety of the nuclear power plant. During shutdown, refueling or overhaul, boron is also needed to keep the active area in a subcritical state for a long time. Therefore, the boron content in the coolant has a significant impact. Once it is found that the boron content is insufficient and needs to be supplemented, the supplementation speed should be as fast as possible. However, when supplementing boron, boron powder and water need to be mixed in a certain proportion. The mixing time of powder and water is long, and the mixing efficiency is low, which makes the supplementation speed slow. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a reactor boron and water replenishment system, which can improve the reactor boron and water replenishment efficiency and improve safety.

[0004] To achieve the above-mentioned purpose, the present invention proposes a reactor boron and water replenishment system, comprising a main controller, a boron holding tank for holding boron powder, a primary water holding tank, and a primary mixing tank, wherein the boron holding tank and the primary water holding tank are both connected to the input end of the primary mixing tank through a pipeline, and a first flow control valve and a second flow control valve are respectively arranged between the boron holding tank and the primary mixing tank, and between the primary water holding tank and the primary mixing tank, a primary stirring mechanism is arranged in the primary mixing tank, and further comprising a secondary water storage tank and a secondary mixing tank, wherein the output ends of the primary mixing tank and the secondary water storage tank are respectively connected to the input end of the secondary mixing tank through a pipeline, and a third flow control valve and a fourth flow control valve are respectively arranged on the pipeline, and a first output end of the secondary mixing tank is provided with a third flow control valve and a fourth flow control valve. A delivery pump, wherein the output end of the first delivery pump is connected to the reactor coolant system through a pipeline, the secondary mixing tank comprises a tank body and a premixing tube, the tank body is provided with an agitator, the premixing tube is arranged beside the tank body, and a cylindrical premixing cavity is provided in the premixing tube, a spiral stirring shaft arranged along its length direction can be rotatably provided in the premixing cavity, an end of the premixing tube away from the tank body is provided with a first driving motor drivingly connected to the spiral stirring shaft, an end of the premixing tube close to the tank body is connected to the tank body through a premixing output pipe, a water input pipe and a boron primary mixed liquid input pipe are respectively provided on both sides of the end of the premixing tube away from the premixing output pipe, the water input pipe is connected to the secondary water storage tank, and the boron primary mixed liquid input pipe is connected to the primary mixing tank.

[0005] Preferably, the agitator includes a stirring spindle vertically arranged in the tank body, the stirring spindle is rotatably connected to the top of the tank body, and the tank body is provided with a spindle drive mechanism for driving the stirring spindle to rotate, the stirring spindle extends outside the spindle drive mechanism and is provided with a rotating joint, the premix output pipe is rotatably connected to the rotating joint, a spindle cavity communicating with the premix output pipe is provided in the stirring spindle, and a plurality of spindle liquid outlet holes communicating with the spindle cavity are provided on one end of the stirring spindle close to the tank body.

[0006] Preferably, a plurality of stirring arms fixedly connected to the stirring main shaft are provided on the side thereof, and an arm cavity communicating with the main shaft cavity and a plurality of arm liquid outlet holes communicating with the arm cavity are provided in the stirring arm.

[0007] Preferably, the liquid outlet hole of the support arm is arranged on a side of the stirring support arm away from the stirring main shaft.

[0008] Preferably, a filter is provided between the secondary mixing tank and the first delivery pump.

[0009] Preferably, a boron primary mixed liquid storage tank is provided between the primary mixing tank and the secondary mixing tank.

[0010] Preferably, the primary mixing tank and the secondary mixing tank are respectively provided with a first boron concentration detection system and a second boron concentration monitoring system which are connected to the main controller in data communication.

[0011] Preferably, a plurality of heaters are provided in the tank body, and the heaters control the temperature of the liquid in the tank body to maintain at 70°C-80°C.

[0012] The beneficial effects of the reactor boron and water supply system of the present invention: the present invention can mix and prepare boron twice by setting two mixing tanks, namely a primary mixing tank and a secondary mixing tank. The boron holding tank and the primary water holding tank respectively introduce a small amount of water and boron through the primary mixing tank, which can be first mixed into a high-concentration boron solution, and then mixed into a low-concentration boron solution through the secondary mixing tank. The secondary mixing has higher mixing quality and more efficient mixing. The primary mixing tank can pre-mix the high-concentration boron solution, which is convenient for the secondary water storage tank to quickly prepare the boron solution of the required concentration, and can quickly mix the boron solution of the required concentration in a short time to improve efficiency. The secondary mixing tank is provided with a premixing tube, and a spiral stirring shaft is provided in the premixing tube. Water and the boron primary mixed liquid are respectively input through the water input tube and the boron primary mixed liquid input tube for premixing in the premixing tube. After premixing, they are stirred and mixed in the introduction tank body to improve efficiency and make mixing more uniform.

[0013] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0014] Figure 1 It is a structural schematic diagram of a reactor boron and water replenishment system of the present invention.

[0015] Figure 2 The present invention is a schematic diagram of the structure of a secondary mixing tank of a reactor boron and water supply system. [Specific implementation method]

[0016] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0017] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0018] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Embodiment 1:

[0021] See also Figure 1 , Figure 2The present invention provides a reactor boron and water replenishment system, comprising a main controller, a boron holding tank 1 for holding boron powder, a primary water holding tank 2, and a primary mixing tank 3, wherein the boron holding tank 1 and the primary water holding tank 2 are both connected to the input end of the primary mixing tank 3 through a pipeline, and a first flow control valve 4 and a second flow control valve 5 are respectively arranged between the boron holding tank 1 and the primary mixing tank 3, and between the primary water holding tank 2 and the primary mixing tank 3, a primary stirring mechanism is arranged in the primary mixing tank 3, and further comprising a secondary water storage tank 6 and a secondary mixing tank 7, wherein the output ends of the primary mixing tank 3 and the secondary water storage tank 6 are respectively connected to the input end of the secondary mixing tank 7 through a pipeline, and a third flow control valve 8 and a fourth flow control valve 9 are respectively arranged on the pipeline, and a first delivery pump 10 is arranged at the output end of the secondary mixing tank 7, and the output end of the first delivery pump 10 is connected to the input end of the secondary mixing tank 7 through a pipeline. The secondary mixing tank 7 comprises a tank body 71 and a premixing tube 72, wherein the tank body 71 is provided with an agitator 73, the premixing tube 72 is provided beside the tank body 71, and a cylindrical premixing cavity is provided in the premixing tube 72, a spiral stirring shaft 74 is rotatably provided in the premixing cavity along its length direction, an end of the premixing tube 72 away from the tank body 71 is provided with a first driving motor 75 transmission-connected to the spiral stirring shaft 74, an end of the premixing tube 72 close to the tank body 71 is communicated with the tank body 71 through a premixing output pipe 76, a water input pipe 77 and a boron initial mixed liquid input pipe 78 are respectively provided on both sides of the end of the premixing tube 72 away from the premixing output pipe 76, the water input pipe 77 is communicated with the secondary water storage tank 6, and the boron initial mixed liquid input pipe 78 is communicated with the primary mixing tank 3. In this embodiment, by setting two mixing tanks, the primary mixing tank 3 and the secondary mixing tank 7, the boron can be mixed and prepared on both sides. The boron holding tank 1 and the primary water holding tank 2 respectively introduce a small amount of water and boron through the primary mixing tank 3, which can be first mixed into a high-concentration boron solution, and then mixed into a low-concentration boron solution through the secondary mixing tank 7. The secondary mixing has higher mixing quality and more efficient mixing. The primary mixing tank 3 can pre-mix the high-concentration boron solution, which is convenient for the secondary water storage tank 6 to quickly prepare the boron solution of the required concentration, and can quickly mix the boron solution of the required concentration in a short time to improve efficiency. The secondary mixing tank 7 is provided with a premixing tube 72, and a spiral stirring shaft 74 is provided in the premixing tube 72. Water and the boron primary mixed liquid are respectively input through the water input pipe 77 and the boron primary mixed liquid input pipe 78 to be premixed in the premixing tube 72. After premixing, they are stirred and mixed in the introduction tank body 71 to improve efficiency and make mixing more uniform.

[0022] See also Figure 1 , Figure 2The stirrer 73 includes a stirring spindle 731 vertically arranged in the tank body 71, the stirring spindle 731 is rotatably connected to the top of the tank body 71, and the tank body 71 is provided with a spindle driving mechanism 732 for driving the stirring spindle 731 to rotate, the stirring spindle 731 extends outside the spindle driving mechanism 732 and is provided with a rotary joint 733, the premix output pipe 76 is rotatably connected to the rotary joint 733, the stirring spindle 731 is provided with a spindle cavity connected to the premix output pipe 76, and the stirring spindle 731 is provided with a plurality of spindle liquid outlet holes 7311 connected to the spindle cavity at one end close to the tank body 71. The boron primary mixed liquid is directly introduced into the tank body 71 through the spindle cavity in the stirring spindle 731, so that the boron primary mixed liquid is immediately stirred by the stirrer 73 after being introduced into the tank body 71, thereby improving the stirring quality and efficiency.

[0023] See also Figure 1 , Figure 2 The side of the stirring main shaft 731 is provided with a plurality of stirring arms 734 fixedly connected thereto, and the stirring arms 734 are provided with an arm cavity communicating with the main shaft cavity and a plurality of arm liquid outlet holes 7341 communicating with the arm cavity.

[0024] See also Figure 1 , Figure 2 The arm liquid outlet hole 7341 is arranged on a side of the stirring arm 734 away from the stirring main shaft 731 .

[0025] See also Figure 1 , Figure 2 A filter 11 is provided between the secondary mixing tank 7 and the first delivery pump 10 .

[0026] See also Figure 1 , Figure 2 A boron primary mixed liquid storage tank 12 is provided between the primary mixing tank 3 and the secondary mixing tank 7 .

[0027] See also Figure 1 , Figure 2 The primary mixing tank 3 and the secondary mixing tank 7 are respectively provided with a first boron concentration detection system 14 and a second boron concentration monitoring system 15 which are connected to the main controller for data communication.

[0028] See also Figure 1 , Figure 2 A plurality of heaters 79 are also provided in the tank body 71, and the heaters 79 control the liquid temperature in the tank body 71 to maintain at 70°C-80°C.

[0029] Working process of the present invention:

[0030] In the operation process of a reactor boron and water replenishment system of the present invention, a boron holding tank 1 and a primary water holding tank 2 respectively introduce a small amount of water and boron through a primary mixing tank 3, which can be first mixed into a high-concentration boron solution and introduced into a boron primary mixed liquid storage tank 12 for storage. When the reactor coolant system is connected and boron needs to be added, water and boron primary mixed liquid are respectively introduced into the premixing pipe 72 through a water input pipe 77 and a boron primary mixed liquid input pipe 78 in a certain proportion, and are premixed by rotating a spiral stirring shaft 74 in a premixing pipe 72, and then introduced into the tank body 71 through a stirring main shaft 731 for stirring and mixing, thereby improving efficiency and making the mixing more uniform, and then introduced into the reactor coolant system through a first delivery pump 10.

[0031] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A reactor boron and water supply system, comprising a main controller, a boron holding tank (1) for holding boron powder, a primary water holding tank (2), and a primary mixing tank (3), wherein the boron holding tank (1) and the primary water holding tank (2) are both connected to an input end of the primary mixing tank (3) through a pipeline, and a first flow control valve (4) and a second flow control valve (5) are respectively arranged between the boron holding tank (1) and the primary mixing tank (3), and between the primary water holding tank (2) and the primary mixing tank (3), and a primary stirring mechanism is arranged in the primary mixing tank (3), characterized in that: The invention also comprises a secondary water storage tank (6) and a secondary mixing tank (7), wherein the output ends of the primary mixing tank (3) and the secondary water storage tank (6) are respectively connected to the input end of the secondary mixing tank (7) through pipelines, and the pipelines are respectively provided with a third flow control valve (8) and a fourth flow control valve (9), the output end of the secondary mixing tank (7) is provided with a first delivery pump (10), and the output end of the first delivery pump (10) is connected to the reactor coolant system through a pipeline, and the secondary mixing tank (7) comprises a tank body (71) and a premixing pipe (72), wherein the tank body (71) is provided with an agitator (73), the premixing pipe (72) is provided beside the tank body (71), and the premixing pipe (72) is provided with a cylindrical A premixing chamber is provided in the premixing chamber, wherein a spiral stirring shaft (74) is rotatably arranged along the length direction thereof, a first driving motor (75) is provided on the end of the premixing tube (72) away from the tank body (71) and is transmission-connected to the spiral stirring shaft (74), an end of the premixing tube (72) close to the tank body (71) is communicated with the tank body (71) through a premixing output pipe (76), a water input pipe (77) and a boron primary mixed liquid input pipe (78) are respectively provided on both sides of the end of the premixing tube (72) away from the premixing output pipe (76), the water input pipe (77) is communicated with the secondary water storage tank (6), and the boron primary mixed liquid input pipe (78) is communicated with the primary mixing tank (3).

2. A reactor boron and water supply system as claimed in claim 1, characterized in that: The agitator (73) comprises a stirring main shaft (731) vertically arranged in the tank body (71); the stirring main shaft (731) is rotatably connected to the top of the tank body (71); the tank body (71) is provided with a main shaft driving mechanism (732) for driving the stirring main shaft (731) to rotate; the stirring main shaft (731) extends outside the main shaft driving mechanism (732) and is provided with a rotating joint (733); the premix output pipe (76) is rotatably connected to the rotating joint (733); a main shaft cavity communicating with the premix output pipe (76) is provided in the stirring main shaft (731); and a plurality of main shaft liquid outlet holes (7311) communicating with the main shaft cavity are provided at one end of the stirring main shaft (731) close to the tank body (71).

3. A reactor boron and water supply system as claimed in claim 2, characterized in that: A plurality of stirring arms (734) fixedly connected to the stirring main shaft (731) are provided on the side thereof, and an arm cavity communicating with the main shaft cavity and a plurality of arm liquid outlet holes (7341) communicating with the arm cavity are provided in the stirring arm (734).

4. A reactor boron and water supply system as claimed in claim 3, characterized in that: The support arm liquid outlet hole (7341) is arranged on a side of the stirring support arm (734) away from the stirring main shaft (731).

5. A reactor boron and water supply system as claimed in claim 1, characterized in that: A filter (11) is provided between the secondary mixing tank (7) and the first delivery pump (10).

6. A reactor boron and water supply system as claimed in claim 1, characterized in that: A boron primary mixed liquid storage tank (12) is provided between the primary mixing tank (3) and the secondary mixing tank (7).

7. A reactor boron and water supply system as claimed in claim 1, characterized in that: The primary mixing tank (3) and the secondary mixing tank (7) are respectively provided with a first boron concentration detection system (14) and a second boron concentration monitoring system (15) which are connected to the main controller for data communication.

8. A reactor boron and water replenishment system as claimed in claim 1, characterized in that: A plurality of heaters (79) are also provided in the tank body (71), and the heaters (79) control the temperature of the liquid in the tank body (71) to maintain at 70°C-80°C.

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