阅读说明：本技术 一种容积控制箱、容积控制系统及化学和容积控制系统 (Volume control box, volume control system and chemistry and volume control system ) 是由 王乃华 池翔宇 于 2020-06-04 设计创作，主要内容包括：本发明属于容积控制箱领域,提供一种容积控制箱、容积控制系统及化学和容积控制系统。其中,一种容积控制箱,包括容积控制箱壳体；若干个入口,所有入口呈中心对称分布在容积控制箱壳体上,所有入口高度相同；每个入口的轴线与相应入口处的容积控制箱壳体壁面的法线不共线；出口,其连接在容积控制箱壳体的底部。其可以减少在局部的流动死区,增强整个容积控制箱内的混合效果。(The invention belongs to the field of volume control boxes, and provides a volume control box, a volume control system and a chemical and volume control system. Wherein, a volume control box comprises a volume control box shell; the inlets are distributed on the shell of the volume control box in a central symmetry mode, and the heights of the inlets are the same; the axis of each inlet is not collinear with the normal to the wall of the volume control box housing at the respective inlet; an outlet connected to a bottom of the volume control box housing. It can reduce the local flow dead zone and enhance the mixing effect in the whole volume control box.)

1. A volume control box, comprising:

a volume control box housing;

the inlets are distributed on the shell of the volume control box in a central symmetry mode, and the heights of the inlets are the same; the axis of each inlet is not collinear with the normal to the wall of the volume control box housing at the respective inlet;

an outlet connected to a bottom of the volume control box housing.

2. The volume control box of claim 1, wherein the volume control box housing is a centrally symmetric structure.

3. A volume control box according to claim 2, wherein the body of the volume control box housing is cylindrical.

4. The volume control box of claim 2, wherein the upper and lower ends of the volume control box housing are elliptical heads.

5. The volume control box of claim 1, wherein the outlet is connected at a bottom midpoint of the volume control box housing.

6. A volume control box according to claim 1, characterised in that the level of the inlet is located in the lower part of the volume control box housing.

7. The volume control box of claim 1, wherein the inlet is a round tube.

8. The volume control box of claim 1, wherein the outlet is a round tube.

9. A volume control system comprising a volume control chamber according to any one of claims 1-8.

10. A chemical and volumetric control system comprising the volumetric control system of claim 9.

Technical Field

The invention belongs to the field of volume control boxes, and particularly relates to a volume control box, a volume control system and a chemical and volume control system.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Common ways of achieving liquid mixing in tanks in industry are mainly impeller stirring and jet mixing. Generally, for tanks using jet mixing, the liquid is drawn into the pump and discharged as a high velocity liquid from the nozzle back into the slow flowing or stationary tank liquid, and the resulting jet entrains the surrounding fluid, creating a circulation of fluid within the tank. Finally, the working media with different components are fully mixed. In a pressurized water reactor nuclear power plant, a chemical and volume control system is provided with a volume control box for buffering the volume change of a primary circuit which cannot be absorbed by a voltage stabilizer, and the working principle of the chemical and volume control system is jet mixing.

The upper space of the volume control box is nitrogen, and the lower space of the volume control box is primary loop coolant. The principle of jet mixing is used in primary circuit boronization and primary circuit dilution. When the boronizing/diluting operation of the loop is carried out through the boron supplementing/water supplementing interface, one part of injected boric acid solution/water directly enters the loop, and the other part of the injected boric acid solution/water needs to enter the volume control box first and then enters the loop after being stirred and mixed. Generally, when the boration or dilution work is performed, a target value of the outlet boric acid concentration of a certain volume control box and a target value of the final boric acid concentration inside the volume control box are used as control indexes.

The boric acid solution injected into the volume control box has small flow and low flow rate, the original water volume of the volume control box is larger, the boric acid solution has retention effect on the injected boric acid solution, and a loop needs a long time to reach the target boron concentration after the boronization injection is finished. Similarly, when the primary circuit dilution operation is performed, the injected clean water is also retained in the volume control tank, and it takes a long time for the primary circuit to reach the target boron concentration after the dilution injection is finished. This concentration lag phenomenon has an adverse effect on the reactivity control of the reactor.

In the conventional technique, in order to reduce the time required for reaching the target value of the boric acid concentration at the outlet of the volume control tank and the target value of the final boric acid concentration inside the volume control tank, it is common to increase the flow rate at the inlet. However, as the inlet flow rate increases, the liquid level in the volume control tank may be unstable, and the dissolution of nitrogen in the volume control tank may be accelerated. In addition, in the boronizing and diluting working conditions, in the prior art, the macroscopic mixing in the volume control box is weak, and the time for the outlet boric acid concentration of the volume control box to reach the target value of the outlet boric acid concentration of the volume control box is obviously too long. Meanwhile, in the prior art, the inventor finds that due to the asymmetric geometry, the boric acid concentration is unevenly distributed in the volume control box, dead zones are easily formed, and finally, the time for reaching the target value of the final boric acid concentration in the volume control box is too long.

Disclosure of Invention

In order to solve the above problems, the present invention provides a volume control tank, a volume control system, and a chemical and volume control system, which can reduce a flow dead zone in a local region and enhance a mixing effect in the entire volume control tank.

In order to achieve the purpose, the invention adopts the following technical scheme:

a first aspect of the invention provides a volume control box.

A volume control box comprising:

a volume control box housing;

the inlets are distributed on the shell of the volume control box in a central symmetry mode, and the heights of the inlets are the same; the axis of each inlet is not collinear with the normal to the wall of the volume control box housing at the respective inlet;

an outlet connected to a bottom of the volume control box housing.

A second aspect of the invention provides a volume control system.

A volume control system comprising a volume control box as described above.

A third aspect of the invention provides a chemical and volumetric control system.

A chemical and volumetric control system comprising a volumetric control system as described above.

Compared with the prior art, the invention has the beneficial effects that:

(1) the plurality of inlets are formed in the volume control box, so that the inlet flow rate can be guaranteed not to be too high while the flow entering the volume control box is large, the liquid level in the volume control box is guaranteed not to fluctuate due to high flow rate, and the nitrogen dissolving speed is guaranteed not to change obviously due to fluctuation of the liquid level.

(2) The inlets are centrally and symmetrically distributed on the volume control box shell, and the heights of all the inlets are the same, so that local flow dead zones can be reduced, and the mixing effect in the whole volume control box is enhanced.

(3) The axis of each inlet is not collinear with the normal of the wall surface of the volume control box shell at the corresponding inlet, so that jet flow is directly jetted into the opposite volume control box shell from the inlet along the axis of the corresponding inlet, a circle is tangent to all jet flows and is a tangent circle, and the tangent circle is positioned in the central part of all jet flows to form negative pressure to suck upper fluid; meanwhile, the jet flow enters the volume control box shell and then rotates along the volume control box to flow downwards, and the rotation of the solution in the volume control box increases the stroke, so that the stirring effect is enhanced, the internal velocity field and the concentration field are more uniform, and the time for reaching the target value of the concentration (such as the concentration of boric acid) of the liquid at the outlet of the volume control box is effectively reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic front view of an embodiment of a volume control box with tangential inlet distribution according to the present invention.

FIG. 2 is a cross-sectional view of an embodiment of a volume control box with a tangential inlet distribution according to the present invention.

FIG. 3 is a schematic front view of another embodiment of a volume control box with tangential inlet distribution according to the present invention.

FIG. 4 is a cross-sectional view of another embodiment of a volumetric control box according to the present invention having a tangential inlet arrangement.

Wherein, 1, an inlet I; 2. an outlet; 3. an inlet II; 4. a volume control box housing; 5. an inlet III; 6. an inlet IV; 7. a cross section; 8. the axis of the inlet is angled normal to the wall of the volume control box housing.

Detailed Description

The invention is further described with reference to the following figures and examples.

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.

In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.

As shown in fig. 1, a volume control box of the present embodiment includes a volume control box housing, an inlet, and an outlet. The first inlet 1, the second inlet 3 and the outlet 2 are connected to the volume control box shell 4, wherein the first inlet 1 and the second inlet 3 are connected to the periphery of the volume control box shell 4; the outlet 2 is connected to the bottom of the volume control box housing 4.

The volume control box housing of the present embodiment is itself a centrally symmetric structure. In the specific implementation, the volume control box shell 4 is cylindrical in shape, and the upper end and the lower end are both elliptical end sockets. The outlet 2 of the present embodiment is connected to the bottom of the volume control box housing 4 at a substantially central location.

It should be noted here that in other embodiments, the volume control box housing may also be an axisymmetric structure, such as: the main body of the volume control box shell is cylindrical, the lower end of the volume control box shell is an elliptical seal head, and the upper end of the volume control box shell is a seal head with a flat plate structure.

Wherein the upper region of the volume control box is nitrogen and the lower region is liquid, and an obvious and stable liquid level exists.

In a specific implementation, the inlet and outlet are both round tubes.

It will be appreciated that in other embodiments, the inlet and outlet may take other forms of pipe, such as square or diamond shaped or oval shaped, etc.

In order to reduce the local flow dead zone and enhance the mixing effect in the whole volume control box, the first port 1 and the second port 3 of the present embodiment are distributed on the volume control box shell 4 in a central symmetry manner, and the first port 1 and the second port 3 are on the same horizontal plane, namely, at the same height, as shown in fig. 2. Wherein the level is located in the lower part of the volume control box housing 4. And the axis of each inlet is not collinear with the normal to the wall of the volume control box housing at the respective inlet. The angle formed by the axis of the inlet and the normal to the wall of the volume control box housing is the angle 8 formed by the axis of the inlet and the normal to the wall of the volume control box housing.

The volume control case of this embodiment's a plurality of entries can realize that the flow that the volume control case got into is great while can guarantee again that the entry velocity of flow is unlikely to too high target to guarantee that the liquid level can not take place undulant because of the high velocity of flow in the volume control case, thereby the speed that nitrogen gas dissolves in to dissolving in the reinforcing volume control case.

The first inlet 1 and the second inlet 3 are used for enabling a boric acid solution to enter;

the outlet 2 is used for allowing the mixed boric acid solution to flow out.

Wherein, the angle 8 formed by the axis of the inlet and the normal of the wall surface of the volume control box shell can be specifically set according to the actual situation, and the range is between 0 degree and 90 degrees.

The axis of each inlet is not collinear with the normal to the wall of the volume control box housing at the respective inlet so that the jets are directed from the inlets along the respective inlet axis into the opposite volume control box housing, there being a circle tangential to all the jets, this circle being the tangent circle 9. The tangential circle 9 in the central part of all the jets creates a negative pressure, causing entrainment of the upper fluid. In such a volume control chamber, the individual jets together form a distinct circle of tangency during operation. The cross section in the volume control box can be divided into three areas by taking the circle center of the tangent circle as the center. A central negative pressure region, a weakly mixed region adjacent to the wall surface, and a strongly mixed region between the weakly mixed region and the negative pressure region.

Meanwhile, the jet flow enters the volume control box shell and then rotates along the volume control box to flow downwards, and the rotation of the solution in the volume control box increases the stroke, so that the stirring effect is enhanced, the internal velocity field and the concentration field are more uniform, and the time for reaching the target value of the concentration (such as the concentration of boric acid) of the liquid at the outlet of the volume control box is effectively reduced.

FIG. 3 is a schematic front view of another embodiment of a volume control box with tangential inlet distribution.

As shown in fig. 3, on the basis of fig. 2, the inlet one 1, the inlet two 3, the inlet three 5, the inlet four 6 and the outlet 2 are connected to the volume control box shell 4, wherein the inlet one 1, the inlet two 3, the inlet three 5 and the inlet four 6 are connected around the volume control box shell 4; the outlet 2 is connected to the bottom of the volume control box housing 4.

This embodiment sets up four entries, can make volume control box get into the flow great while can guarantee again that the entry velocity of flow is unlikely to too high to it is undulant to avoid the liquid level that the high velocity of flow caused, and then avoids the improvement of the nitrogen gas dissolving speed that the liquid level is undulant to cause.

The entry that this embodiment set up all is on same horizontal plane and be central symmetry distribution on volume control case casing 4, has reduced the flow dead zone of volume control incasement portion like this, makes the effect homoenergetic that the efflux was stirred thoughtlessly realize in whole volume control incasement, effectively reduces the time of arriving the final boric acid concentration's of volume control incasement target value.

The axes of the first inlet 1, the second inlet 3, the third inlet 5 and the fourth inlet 6 are not collinear with the normal of the wall surface of the volume control box shell at the corresponding inlets, the jet flow is directly injected into the opposite volume control box shell from the inlets along the corresponding inlet axes, a circle is tangent to all the jet flows, and the circle is a tangent circle 9. The tangential circle 9 in the central part of all the jets creates a negative pressure, causing entrainment of the upper fluid. In such a volume control chamber, the individual jets together form a distinct circle of tangency during operation. Meanwhile, the jet flow enters the volume control box shell and then rotates along the volume control box to flow downwards, and the rotation of the solution in the volume control box increases the stroke, so that the stirring effect is enhanced, the internal velocity field and the concentration field are more uniform, and the time for reaching the target value of the concentration (such as the concentration of boric acid) of the liquid at the outlet of the volume control box is effectively reduced.

The normal direction of the inlet axis and the wall surface of the volume control box shell, which is arranged in the embodiment, is an angle 8 formed by the axis of the inlet and the normal line of the wall surface of the volume control box shell on the horizontal plane, so that a plurality of jet flows can form a tangent circle, and obvious tangent circle type mixing is formed in the volume control box, thereby effectively reducing the time for reaching the target value of the concentration of the boric acid at the outlet of the volume control box.

In another embodiment, there is also provided a volume control system comprising a volume control box as described above.

It should be noted that other structures of the volume control system are conventional structures, and will not be described herein again.

In another embodiment, there is also provided a chemical and volumetric control system comprising the volumetric control system described above.

It is understood that other configurations of the chemical and volume control system of the present embodiment are conventional and will not be discussed in detail herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.