阅读说明：本技术 一种用于核反应堆直接安注情况下的半开式导流装置 (Semi-open type flow guide device used under direct safety injection condition of nuclear reactor ) 是由 张明乾 付月明 章捷 张辉 王庆礼 司恒远 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种用于核反应堆直接安注情况下的半开式导流装置,用于与直接安注管嘴的出口对应从而对安全注射水进行导流,所述半开式导流装置包括：连接部件以及导流部件；所述连接部件与核反应堆吊篮筒体外壁固定连接,用于固定并支撑所述半开式导流装置,所述导流部件与所述连接部件固定连接,用于引导所述安全注射水,所述导流部件与所述吊篮筒体形成流通通道,用于供安全注射水流动。本发明引导安全注射水沿吊篮外壁面向下流动,提高安全注射水注入堆芯的流量,便于核反应堆构件在役检查。(The invention discloses a semi-open type flow guide device used under the condition of direct safety injection of a nuclear reactor, which is used for guiding safe injection water by corresponding to an outlet of a direct safety injection nozzle, and comprises: a connecting member and a flow guide member; the connecting part is fixedly connected with the outer wall of the nuclear reactor hanging basket barrel and used for fixing and supporting the semi-open type flow guide device, the flow guide part is fixedly connected with the connecting part and used for guiding the safe injection water, and the flow guide part and the hanging basket barrel form a flow passage and are used for the safe injection water to flow. The invention guides the safe injection water to flow downwards along the outer wall surface of the hanging basket, improves the flow rate of the safe injection water injected into the reactor core, and is convenient for in-service inspection of nuclear reactor components.)

1. Semi-open flow-guiding device for nuclear reactor direct injection, for guiding safety injection water in correspondence with the outlet of a direct injection pipe (3), characterized in that said semi-open flow-guiding device (100) comprises: a connecting member (120) and a flow guide member (110); the connecting part (120) is fixedly connected with the outer wall of a barrel of a nuclear reactor hanging basket (2) and used for fixing and supporting the semi-open type flow guide device (100), the flow guide part (110) is fixedly connected with the connecting part (120) and used for guiding the safe injection water, and the flow guide part (110) and the barrel of the hanging basket (2) form a flow channel (130) for the safe injection water to flow.

2. The semi-open deflector of claim 1, wherein the deflector member (110) comprises: the side baffle (111) comprises a side baffle cambered surface (111a), a first plane (111b) and a second plane (111c), the first plane (111b) and the second plane (111c) are fixedly connected with the connecting part (120), and the side baffle (111) is used for preventing the injected safe injection water from continuously diffusing along the outer wall surface of the hanging basket (2) and guiding the safe injection water to flow; the front baffle (112) is a semi-open type baffle, is in an inverted U shape, and is used for injecting the safe injection water to the flow channel (130) and guiding the safe injection water to flow.

3. The semi-open type flow guiding device of claim 2, wherein the radius of the front baffle (112) is larger than the radius of the outer wall of the barrel of the hanging basket (2) and is concentric with the outer wall of the barrel of the hanging basket (2), the front baffle (112) comprises a slot (112a) in the middle area, and a first arc section (112b) and a second arc section (112c) which are distributed at two sides of the slot (112a), and the width of the slot (112a) is larger than the diameter of the direct injection pipe (3) so as to facilitate the safe injection water to be injected into the flow channel (130).

4. The semi-open type flow guiding device as claimed in claim 3, wherein the center of the slot (112a) is opposite to the center of the direct injection pipe (3) for reducing the bypass flow of the safe injection water.

5. A semi-open deflector according to claim 4, characterized in that the semi-open deflector (100) has an axial length along the basket (2) cylinder of more than 300mm for guiding the safety injection water to flow down along the outer wall of the basket (2) cylinder.

6. Semi-open deflector according to claim 5, characterized in that the width of the side baffle (111) in the radial direction of the nuclear reactor gondola (2) cylinder is less than 150 mm.

7. The semi-open deflector of claim 6, wherein the first and second arc segments (112b, 112c) have equal widths, and the widths of the first and second arc segments (112b, 112c) are greater than 50 mm.

8. The semi-open deflector according to claim 7, wherein the connection member (120) comprises a first connection member (121) and a second connection member (122), the first connection member (121) and the second connection member (121) being fixedly connected to the first plane (111b) and the second plane (111c), respectively.

9. The semi-open type flow guiding device as claimed in claim 8, wherein the first connecting part (121) and the second connecting part (122) are flanges, and the flanges are fixedly connected with the outer wall of the barrel of the hanging basket (2) through bolts.

10. Semi-open deflector according to claim 9, characterized in that the connecting member (120), the front baffle (112) and the side baffles (111) are made of austenitic stainless steel sheet material.

Technical Field

The invention relates to the field of internal structural members of nuclear reactors, in particular to a semi-open type flow guide device used under the condition of direct safety injection of a nuclear reactor.

Background

The reactor in the nuclear power station works under high temperature and high pressure, high-temperature coolant heated by the reactor core flows out of the reactor pressure vessel, sequentially passes through the hot section main pipe, the steam generator, the transition section main pipe, the main pump and the cold section main pipe in each loop, is subjected to heat exchange in the steam generator to reduce the temperature, and finally flows back to the reactor pressure vessel for cooling the reactor core. When the nuclear power plant normally operates, if a breach is generated in equipment in the loop, coolant can directly flow out of the breach, so that insufficient coolant flows back to a reactor pressure vessel, and a reactor water loss accident occurs. In order to prevent the core from increasing in temperature due to lack of coolant, the safety injection system must be immediately activated to fill the reactor pressure vessel with water. The safety injection connecting pipe of the traditional safety injection system is connected with the cold pipe section of the main pipeline, and the safety injection water is injected into the reactor pressure vessel through the cold pipe section under the accident condition, so that the purpose of cooling the reactor core is achieved. For the traditional injection mode, if the break position is on the main pipeline connected with the safety injection connecting pipe, the coolant injected from the safety injection connecting pipe can directly flow out from the break position of the main pipeline and cannot flow into the reactor pressure vessel, so that the insufficient safe injection water is finally caused to effectively cool the reactor core, and the accident process cannot be effectively relieved. For avoiding aforementioned unfavorable phenomenon, on the position that direct ann annotates the technique and change the pressure vessel with the ann injection takeover from the trunk line, under the accident condition that the trunk line produced the breach, can directly pour into reactor pressure vessel with safe injection water through direct ann injection takeover in, and need not through the trunk line, avoided losing safe injection water from the trunk line breach, improved the validity that safe injection water pours into the reactor core to nuclear power unit's security has been promoted. At present, more nuclear power reactor types adopt a direct safety injection technology.

West House electric company filed patent application publication No. CN101681685A, and FIGS. 1 and 2 show the arrangement and outline of the flow deflector of the present invention. The direct vessel injection flow deflector may be described as a solid cylinder made of metal such as stainless steel with a groove 76 machined into its front surface 72 directly below the top lip 74. A slot 76 extends downwardly from the top lip through the bottom of the front surface 72. The width of the slot 76 directly matches the flow of the direct vessel injection nozzle 58 in the pressure vessel 10 at a height directly below the top lip 74. The slots 76 redirect water flowing from the nozzles 58 downward through the annular space between the basket 32 and the pressure vessel 10 to a cavity below the core. Because the technology adopts the stainless steel solid cylinder, in order not to influence the installation of the hanging basket, a certain gap (3 mm-5 mm) needs to be reserved between the flow deflector and the injection nozzle 58 of the direct container, and the width of the annular cavity space between the pressure container and the hanging basket is only about 200mm, so that the depth dimension of the groove 76 of the flow deflector disclosed by the invention is smaller, the violent and unstable flow change is caused after high-speed fluid reaches the surface of the groove 76, and the effect of guiding the fluid downwards is finally reduced. In addition, because the radial space occupied by the flow deflector in the annular space is large, in order to not influence the functions of other components in the reactor, the selectable arrangement positions of the flow deflector in the circumferential direction of the annular space are very limited, thereby influencing the arrangement direction of the injection nozzles of the direct container and being not beneficial to the application of the flow deflector in the reactor.

The invention patent (anti-bypass direct safety injection flow guide part and direct safety injection device) with the publication number of CN104008781A is applied by Zhongke Hua nuclear power technology research institute Co., Ltd, and a schematic diagram of the flow deflector of the invention is given by combining with figures 3 and 4, the technology comprises a direct safety injection nozzle 40 and an anti-bypass direct safety injection flow guide part 50, wherein the anti-bypass direct safety injection flow guide part 50 comprises a hollow and downwards bent flow guide pipe body. The direct safety injection guide piece 50 is butted with the outlet of the direct safety injection nozzle 40 so as to guide the safety injection water. Because the direct safety injection guide piece 50 is butted with the outlet of the direct safety injection nozzle 40 into a whole, the outlet of the direct safety injection nozzle 40 is shielded, and the direct safety injection nozzle 40 cannot be subjected to in-service inspection. In addition, the direct safety injection flow guide piece 50 is of a thin-wall cantilever structure and is always impacted by water flow during normal operation of a power station, so that the power station is easily damaged by fatigue.

Therefore, a semi-open type flow guide device for the direct safety injection condition of the nuclear reactor is urgently needed to be provided, and the technical problems that the flow guide effect is poor, the radial occupied space of an annular space is large, the implementation of in-service inspection of other components of the nuclear reactor is influenced and the like in the prior art are solved.

Disclosure of Invention

The invention provides a semi-open type flow guide device used under the condition of direct safety injection of a nuclear reactor, and aims to solve the technical problems that the flow guide effect is poor, the radial space of an annular space is large, the implementation of in-service inspection of other components of the nuclear reactor is influenced, and the like in the prior art.

The technical scheme of the invention for solving the technical problems is as follows: the invention provides a semi-open type flow guide device used under the condition of direct safety injection of a nuclear reactor, which is used for corresponding to an outlet of a direct safety injection nozzle so as to guide safe injection water, and comprises: a connecting member and a flow guide member; the connecting part is fixedly connected with the outer wall of the nuclear reactor hanging basket barrel and used for fixing and supporting the semi-open type flow guide device, the flow guide part is fixedly connected with the connecting part and used for guiding the safe injection water, and the flow guide part and the hanging basket barrel form a flow passage and are used for the safe injection water to flow.

In the above-mentioned semi-open type fluid guiding device of the present invention, the fluid guiding member comprises: the side baffle comprises an arc surface, a first plane and a second plane, the first plane and the second plane are fixedly connected with the connecting part, and the side baffle is used for preventing the injected safe injection water from continuously diffusing along the outer wall surface of the hanging basket and guiding the safe injection water to flow; the front baffle is a semi-open type baffle, is in an inverted U shape, and is used for enabling the safe injection water to be sprayed to the flow channel and guiding the safe injection water to flow.

In the semi-open type flow guide device, the circle center of the cambered surface of the front baffle is over against the center of the safety injection pipe nozzle and is used for reducing the side flow of safe injection water.

In the semi-open type flow guiding device, the radius of the front baffle is larger than that of the outer wall of the hanging basket barrel and is concentric with the outer wall of the hanging basket barrel, the front baffle comprises a groove in the middle area, and a first arc section and a second arc section which are distributed on two sides of the groove, the width of the groove is larger than the diameter of the direct injection pipe, safe injection water can be conveniently injected into the circulation channel, and the widths of the first arc section and the second arc section are equal.

In the above-mentioned semi-open type flow guiding device of the present invention, the axial length of the semi-open type flow guiding device along the hanging basket cylinder is greater than 300mm, and the semi-open type flow guiding device is used for guiding the safe injection water to flow downwards along the outer wall of the hanging basket cylinder.

In the semi-open type flow guide device, the width of the side baffle plate along the radial direction of the nuclear reactor hanging basket barrel is less than 150mm, the radial occupied space of the annular space is small, and the function of other components in a reactor cannot be influenced.

In the above semi-open type flow guiding device of the invention, the widths of the first arc section and the second arc section are greater than 50 mm.

In the above semi-open type flow guiding device of the invention, the connecting member includes a first connecting member and a second connecting member, and the first connecting member and the second connecting member are respectively fixedly connected with the first plane and the second plane.

In the semi-open type flow guide device, the first connecting part and the second connecting part are both flanges, and the flanges are fixedly connected with the outer wall of the hanging basket barrel through bolts.

In the semi-open type diversion device, the connecting part, the front baffle and the side baffles are all made of austenitic stainless steel plates.

The technical scheme provided by the embodiment of the invention has the following beneficial effects: the invention provides a semi-open type flow guide device used in the direct safety injection condition of a nuclear reactor, aiming at the technical problems that the flow guide effect is poor, the radial occupied space of an annular space is large, the implementation of in-service inspection of other components of the nuclear reactor is influenced, and the like in the prior art, wherein a side baffle, a front baffle and a hanging basket barrel are communicated to form a flow passage of safe injection water, after the safe injection water is injected to the outer wall surface of the hanging basket barrel from a direct safety injection connecting pipe, the side baffle prevents the safe injection water from diffusing along the outer wall of the hanging basket, guides the safe injection water to slowly rotate and flow along the outer wall surface of the hanging basket; the front baffle enables the safe injection water to stably flow downwards along the flow section with a specific thickness on the outer wall surface of the hanging basket, and the entrainment effect of high-speed steam in the annular cavity on the safe injection water is weakened, so that the flow rate of the safe injection water injected into the reactor core is greatly improved; and the flow guide device is of a semi-open structure, so that the bypass effect is effectively weakened, and the influence on the flow of fluid in the annular cavity of the reactor pressure vessel is extremely small during the normal operation of the reactor.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a prior art arrangement of a nuclear reactor downcomer flow deflector of a safety injection device;

FIG. 2 is a schematic representation of the nuclear reactor downcomer flow deflector of FIG. 1;

FIG. 3 is a schematic structural diagram of a prior art bypass flow prevention type direct injection guide member;

FIG. 4 is a schematic view of a direct safety injection device utilizing the flow guide of FIG. 3;

FIG. 5 is a top view of a semi-open type flow guiding device for a direct safety injection condition of a nuclear reactor according to an embodiment of the present invention;

FIG. 6 is a side view of a semi-open type flow guiding device for a direct safety injection condition of a nuclear reactor, provided by an embodiment of the invention;

FIG. 7 is a schematic structural diagram of a semi-open type flow guiding device for a direct safety injection condition of a nuclear reactor according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a flow guide component of a semi-open flow guide device for a direct safety injection condition of a nuclear reactor, according to an embodiment of the present invention;

FIG. 9 is a sectional view of a semi-open flow guide device flow guide component A-A for direct nuclear reactor safety injection according to an embodiment of the invention;

FIG. 10 is a sectional view of a semi-open flow guide device flow guide component B-B for direct nuclear reactor safety injection according to an embodiment of the invention;

fig. 11 is an effect diagram of a semi-open type flow guiding device for use in a direct safety injection condition of a nuclear reactor according to an embodiment of the present invention.

Detailed Description

In order to solve the technical problems of poor flow guide effect, large radial occupied space in an annular space, influence on in-service inspection of other components of a nuclear reactor and the like in the prior art, the invention aims to provide a semi-open type flow guide device used under the condition of direct safety injection of the nuclear reactor, and the core idea is as follows: the side baffle, the front baffle and the hanging basket barrel are communicated to form a flow channel of safe injection water, after the safe injection water is sprayed to the outer wall surface of the hanging basket barrel from the direct safety injection connecting pipe, the side baffle prevents the safe injection water from diffusing along the outer wall of the hanging basket, guides the safe injection water to slowly rotate in the flow direction and downwards flow along the outer wall surface of the hanging basket; the front baffle enables the safe injection water to stably flow downwards along the flow section with a specific thickness on the outer wall surface of the hanging basket, and the entrainment effect of high-speed steam in the annular cavity on the safe injection water is weakened, so that the flow rate of the safe injection water injected into the reactor core is greatly improved; the flow guide device is of a semi-open structure, so that the bypass effect is effectively weakened, the radial occupied space of the annular space is small, the functions of other components in the reactor cannot be influenced, and the influence on the flow of fluid in the annular cavity of the reactor pressure vessel is extremely small during the normal operation of the reactor.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.