CN116447352A - Nuclear power station voltage stabilizer spray valve - Google Patents
Nuclear power station voltage stabilizer spray valve Download PDFInfo
- Publication number
- CN116447352A CN116447352A CN202310705997.XA CN202310705997A CN116447352A CN 116447352 A CN116447352 A CN 116447352A CN 202310705997 A CN202310705997 A CN 202310705997A CN 116447352 A CN116447352 A CN 116447352A
- Authority
- CN
- China
- Prior art keywords
- valve
- spray
- flow
- nuclear power
- spray valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007921 spray Substances 0.000 title claims abstract description 72
- 239000003381 stabilizer Substances 0.000 title claims abstract description 24
- 239000011148 porous material Substances 0.000 claims abstract description 31
- 230000008859 change Effects 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000005507 spraying Methods 0.000 description 15
- 239000002826 coolant Substances 0.000 description 4
- 230000008602 contraction Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The disclosure belongs to the technical field of nuclear power, and particularly relates to a nuclear power station voltage stabilizer spray valve. In the spray valve disclosed by the invention, the through-flow sectional area of the valve core pore canal is far smaller than the through-flow sectional area when the valve is at a large opening, so that the valve core pore canal does not change the flow when the spray valve is at a large opening, and the original flow characteristic and control requirement of the spray valve can be effectively maintained; further, the pore canal of the spray valve effectively avoids abrupt change of the circulation gap caused by tiny change of the valve core rotation angle when the valve is closed, so that rotation angle change caused by deviation, thermal expansion and the like of a valve transmission part does not influence the medium flow and the spray valve temperature in small flow obviously. Therefore, the stable small-flow flowing medium is continuously and effectively provided for the spray pipeline when the spray valve is closed, and the normal operation of the spray pipeline is ensured.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a spraying valve of a voltage stabilizer of a nuclear power station.
Background
The nuclear power plant reactor coolant pressure boundary, which may be represented as the boundary containing the reactor coolant and radioactive materials at operating temperatures and pressures, is an important barrier to the escape of radioactive fission products, and may include pressure vessels, pipes, pumps, valves, etc. The pressure stabilizer of the reactor coolant pressure system of the nuclear power plant plays a role of maintaining the pressure of a loop to be stable, and generally, the pressure stabilizer maintains the pressure to be 15.5MPa. When the pressure of the first circuit rises, the pressure stabilizer sprays coolant with lower temperature from the upper part of the pressure stabilizer through a spraying system, and steam is partially condensed, so that the pressure drops. The spray system generally has two main spray valves, and during normal operation, the spray valves are in a closed state, and in order to maintain the uniformity of water temperature and chemical components in the pressure stabilizer, the thermal shock to the spray pipeline during the start of high-flow spraying is limited, and a certain amount of continuous spraying of the spray valves is required to continuously flow through the valves during the closing of the spray valves. However, such a structure has a problem:
(1) The structure has high requirements on the transmission precision of the valve core, the size of the gap has obvious influence on the medium flow, and the flow is not easy to accurately control because the flow port area can be greatly changed due to the tiny change of the valve core corner caused by factors such as assembly tolerance, transmission deviation and the like.
(2) When the valve is closed under the condition of low flow, the change of the flow can influence the medium to dissipate heat outwards, so that the temperature of the medium is influenced, and the follow-up voltage stabilizer can be influenced. At present, the temperature difference between the two spray pipelines is required to be less than 5 ℃, but under the existing structure, the actual maximum temperature difference can reach more than 15 ℃ because the flow is difficult to accurately control and the valve core opening degree is further influenced by thermal expansion and contraction.
Therefore, the valve core structure can not maintain the set flow state at the time of low flow. In view of this, it is desirable to keep the valve medium flow stable when the valve is closed and in a low flow state.
Disclosure of Invention
In order to overcome the problems in the related art, the spraying valve of the voltage stabilizer of the nuclear power station is provided.
According to an aspect of the disclosed embodiments, there is provided a nuclear power plant regulator spray valve, the spray valve comprising: the middle part of the valve core is of a hemispherical structure, the outer surface of the valve core is matched with the valve seat, and the opening, closing and flow change of the spray valve are realized by rotating the valve core;
the middle part of the valve core is provided with a flow port, the lower end of the flow port is provided with a pore canal, the inner diameter of the pore canal is 4.7-5.6% of the inner diameter of a channel, and the valve channel is a channel for fluid medium flow between the valve core and a valve seat when the spray valve is in a full-open state;
when the spray valve is in a completely opened state, fluid medium of a spray pipeline of the pressure stabilizer flows through a valve channel between the valve core and the valve seat;
when the spray valve is in a closed state, fluid medium of the spray pipeline of the pressure stabilizer flows through the pore canal.
In one possible implementation, the inner wall of the pore canal is overlaid with a hard alloy, the Rockwell hardness HRC of the hard alloy is greater than 37, and the overlaying depth of the hard alloy is greater than 2mm.
In one possible implementation manner, the roughness Ra of the inner wall of the pore canal is smaller than 1.6, and the ports at the two ends of the pore canal adopt smooth transition.
In one possible implementation, the bore has an inner diameter of 2.5mm to 3mm.
In one possible implementation, the aperture is an O-shaped through hole.
In one possible implementation, the duct is a U-shaped slot.
In one possible implementation, the aperture is a V-groove.
The beneficial effects of the present disclosure are: in the spray valve disclosed by the invention, the through-flow sectional area of the valve core pore canal is far smaller than the through-flow sectional area when the valve is at a large opening, so that the valve core pore canal does not change the flow when the spray valve is at a large opening, and the original flow characteristic and control requirement of the spray valve can be effectively maintained; further, the pore canal of the spray valve effectively avoids abrupt change of the circulation gap caused by tiny change of the valve core rotation angle when the valve is closed, so that rotation angle change caused by deviation, thermal expansion and the like of a valve transmission part does not influence the medium flow and the spray valve temperature in small flow obviously. Therefore, the stable small-flow flowing medium is continuously and effectively provided for the spray pipeline when the spray valve is closed, and the normal operation of the spray pipeline is ensured.
Drawings
Fig. 1 is a cross-sectional view of a nuclear power plant pressurizer spray valve, according to an example embodiment.
Fig. 2 is a perspective view of a nuclear power plant regulator spray valve spool with an O-shaped through hole, according to an example embodiment.
Fig. 3 is a front view of a nuclear power plant regulator spray valve spool with an O-shaped through hole, according to an example embodiment.
Fig. 4 is a perspective view of a nuclear power plant regulator spray valve spool with a V-groove, according to an example embodiment.
Fig. 5 is a perspective view of a nuclear power plant regulator spray valve spool with a U-shaped slot, according to an example embodiment.
In the figure:
1. a valve core; 2. a valve seat; 10. a duct; 11. a flow port.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
The shower valve of the present disclosure may be applied to a reactor-loop cooling system stabilizer shower system, and fig. 1 is a cross-sectional view of a nuclear power plant stabilizer shower valve according to an exemplary embodiment, as shown in fig. 1, the shower valve includes: the valve core 1 and the valve seat 2, the middle part of the valve core 1 is of a hemispherical structure, the outer surface of the valve core 1 is matched with the valve seat 2, the valve core 1 is a main component for controlling the flow of the spray valve, the flow of the spray valve can be controlled by rotating the valve core 1, and the opening and closing of the spray valve are further controlled.
Fig. 2 is a perspective view of a valve core of a spraying valve of a nuclear power station with an O-shaped through hole according to an exemplary embodiment, fig. 3 is a front view of a valve core of a spraying valve of a nuclear power station with an O-shaped through hole according to an exemplary embodiment, as shown in fig. 2 and 3, the valve core 1 is of a symmetrical structure, a circulation port 11 is arranged in a position of a lower middle part of the valve core 1, a duct 10 can be formed at a lower end of the circulation port 11, an inner diameter of the duct 10 is 4.7% to 5.6% of an inner diameter of a valve channel, so that a through-flow cross-sectional area of the duct 10 is only 0.22% to 0.32% of a through-flow cross-sectional area of the valve channel, and the valve channel is a channel through which a fluid medium between the valve core 1 and a valve seat 2 circulates when the spraying valve is in a fully opened state.
When the spraying pipeline of the pressure stabilizer needs to be opened, the spraying valve is controlled to be in a completely opened state, and fluid medium of the spraying pipeline of the pressure stabilizer flows through a valve channel between the valve core 1 and the valve seat 2.
When the spraying pipeline of the voltage stabilizer needs to be closed, the spraying valve is controlled to be in a closed state, fluid medium of the spraying pipeline of the voltage stabilizer flows through the pore channel 10, and small-flow injection with stable flow is formed under the fixed pressure difference of the spraying pipeline of the voltage stabilizer due to the fact that the size of the pore channel 10 is fixed.
When the spray valve is closed to cause the temperature of the medium in the pipeline to change, the matching clearance between the valve core 1 and the valve seat 2 is changed due to thermal expansion and cold contraction; when the spray valve transmission mechanism is deviated, the small change of the corner of the valve core 1 is caused, under the conditions, the through-flow sectional area of the pore channel 10 is far larger than the through-flow sectional area generated by the small gaps, so that when the spray valve is closed, the existence of the pore channel 10 effectively ensures the stability of the through-flow sectional area of a medium, thereby keeping the stability of small flow and keeping the temperature difference between the spray valves within a specified range.
In one possible implementation, the inner diameter of the pore canal may be between 2.5mm and 3mm, so that the medium flow requirement in the case of low-flow can be better met.
In one possible implementation manner, hard alloy is deposited on the inner wall of the pore canal, the Rockwell hardness HRC of the hard alloy is greater than 37, the deposited depth of the hard alloy is greater than 2mm, the roughness Ra of the inner wall of the pore canal is less than 1.6, and the ports at the two ends of the pore canal adopt smooth transition. Thereby slowing down the erosion of the orifice by the fluid medium.
In one possible implementation, as shown in fig. 2 and 3, the channels are O-shaped through holes. Fig. 4 is a perspective view of a nuclear power plant regulator spray valve spool with a V-groove according to an exemplary embodiment, as shown in fig. 4, with the orifice being a U-groove. Fig. 5 is a perspective view of a nuclear power plant regulator spray valve spool having a U-shaped groove according to an exemplary embodiment, as shown in fig. 5, the orifice being a V-shaped groove. The O-shaped through hole, the U-shaped groove and the pore canal of the V-shaped groove structure can realize smooth circulation of fluid medium, and can effectively reduce erosion of the fluid medium and the inner wall of the pore canal.
In the spray valve disclosed by the invention, the through-flow sectional area of the valve core pore canal is far smaller than the through-flow sectional area when the valve is at a large opening, so that the valve core pore canal does not change the flow when the spray valve is at a large opening, and the original flow characteristic and control requirement of the spray valve can be effectively maintained; further, the pore canal of the spray valve effectively avoids abrupt change of the circulation gap caused by tiny change of the valve core rotation angle when the valve is closed, so that rotation angle change caused by deviation, thermal expansion and the like of a valve transmission part does not influence the medium flow and the spray valve temperature in small flow obviously. Therefore, the stable small-flow flowing medium is continuously and effectively provided for the spray pipeline when the spray valve is closed, and the normal operation of the spray pipeline is ensured.
In an application example, the valve 1 and the valve 2 are spray valves, the valve cores of the valve 1 and the valve 2 are designed by adopting O-shaped through holes, through thermal transmission calculation analysis, when the matching rotation angle of the valve cores and the valve seat in the valve 1 and the valve 2 is reduced from 10.5 degrees to 9.0 degrees (the rotation angle range in small flow), the flow and the temperature change of the valve 1 and the valve 2 are smaller, the temperature deviation is less than 2 ℃ and is lower than 5 ℃ specified by the technical standard, as shown in table 1, the matching rotation angle of the valve cores and the valve seat is reduced from 10.5 degrees to 9.0 degrees through four changes of the valve cores and the valve seat, delta theta represents the angle reduced by each change of the matching rotation angle of the valve cores and the valve seat, delta theta and theta are in units of degrees, and the flow units of the valve 1 and the valve 2 are m 3 And/h, the temperatures of valve 1 and valve 2 are in units of ℃.
TABLE 1 valve flow, temperature and temperature drop at different corners
| Δθ | θ | Valve 1 flow | Valve 2 flow rate | Valve 1 temperature | Valve 2 temperature |
| 0 | 10.5 | 0.9736 | 0.9726 | 285.9 | 285.2 |
| 0.5 | 10 | 0.9076 | 0.9070 | 285.6 | 284.8 |
| 1 | 9.5 | 0.8619 | 0.8616 | 285.3 | 284.6 |
| 1.5 | 9.0 | 0.8321 | 0.8320 | 285.2 | 284.4 |
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (7)
1. A nuclear power plant pressurizer spray valve, characterized in that the spray valve comprises: the middle part of the valve core is of a hemispherical structure, the outer surface of the valve core is matched with the valve seat, and the opening, closing and flow change of the spray valve are realized by rotating the valve core;
the middle part of the valve core is provided with a flow port, the lower end of the flow port is provided with a pore canal, the inner diameter of the pore canal is 4.7-5.6% of the inner diameter of a valve channel, and the valve channel is a channel for fluid medium flow between the valve core and a valve seat when the spray valve is in a full-open state;
when the spray valve is in a completely opened state, fluid medium of a spray pipeline of the pressure stabilizer flows through a valve channel between the valve core and the valve seat;
when the spray valve is in a closed state, fluid medium of the spray pipeline of the pressure stabilizer flows through the pore canal.
2. The nuclear power station voltage stabilizer spray valve according to claim 1, wherein the inner wall of the pore canal is overlaid with hard alloy, the Rockwell hardness HRC of the hard alloy is more than 37, and the overlaying depth of the hard alloy is more than 2mm.
3. The nuclear power station voltage stabilizer spray valve according to claim 1, wherein the roughness Ra of the inner wall of the pore canal is less than 1.6, and the ports at the two ends of the pore canal adopt smooth transition.
4. The nuclear power plant pressurizer spray valve of claim 1 wherein said orifice is between 2.5mm and 3mm in inside diameter.
5. The nuclear power plant pressurizer spray valve of claim 1 wherein said orifice is an O-shaped through hole.
6. The nuclear power plant pressurizer spray valve of claim 1 wherein said duct is a U-shaped groove.
7. The nuclear power plant pressurizer spray valve of claim 1 wherein said duct is a V-groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310705997.XA CN116447352B (en) | 2023-06-15 | 2023-06-15 | Nuclear power station voltage stabilizer spray valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310705997.XA CN116447352B (en) | 2023-06-15 | 2023-06-15 | Nuclear power station voltage stabilizer spray valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116447352A true CN116447352A (en) | 2023-07-18 |
| CN116447352B CN116447352B (en) | 2023-09-19 |
Family
ID=87130568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310705997.XA Active CN116447352B (en) | 2023-06-15 | 2023-06-15 | Nuclear power station voltage stabilizer spray valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116447352B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267007A (en) * | 1970-07-10 | 1972-03-15 | ||
| GB1269611A (en) * | 1970-01-05 | 1972-04-06 | Paterex Ltd | Lock nut device |
| DE4301269A1 (en) * | 1993-01-19 | 1994-07-21 | Osi Kommunikations Und Systemt | Construction and fitting kit for optical transmission lines |
| KR19990054204A (en) * | 1997-12-20 | 1999-07-15 | 박실조 | Pipe connector |
| JP2007076677A (en) * | 2005-09-13 | 2007-03-29 | Toyo Seikan Kaisha Ltd | Screw cap |
| CN201705979U (en) * | 2010-06-08 | 2011-01-12 | 昆山新莱洁净应用材料股份有限公司 | Ball valve for preventing liquid from spraying and rising |
| JP2011033160A (en) * | 2009-08-05 | 2011-02-17 | Maezawa Kyuso Industries Co Ltd | Flow rate adjusting stop cock |
| CN205401796U (en) * | 2016-03-07 | 2016-07-27 | 北京市阀门总厂股份有限公司 | Ultra -low temperature ball valve that floats |
-
2023
- 2023-06-15 CN CN202310705997.XA patent/CN116447352B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1269611A (en) * | 1970-01-05 | 1972-04-06 | Paterex Ltd | Lock nut device |
| GB1267007A (en) * | 1970-07-10 | 1972-03-15 | ||
| DE4301269A1 (en) * | 1993-01-19 | 1994-07-21 | Osi Kommunikations Und Systemt | Construction and fitting kit for optical transmission lines |
| KR19990054204A (en) * | 1997-12-20 | 1999-07-15 | 박실조 | Pipe connector |
| JP2007076677A (en) * | 2005-09-13 | 2007-03-29 | Toyo Seikan Kaisha Ltd | Screw cap |
| JP2011033160A (en) * | 2009-08-05 | 2011-02-17 | Maezawa Kyuso Industries Co Ltd | Flow rate adjusting stop cock |
| CN201705979U (en) * | 2010-06-08 | 2011-01-12 | 昆山新莱洁净应用材料股份有限公司 | Ball valve for preventing liquid from spraying and rising |
| CN205401796U (en) * | 2016-03-07 | 2016-07-27 | 北京市阀门总厂股份有限公司 | Ultra -low temperature ball valve that floats |
Non-Patent Citations (2)
| Title |
|---|
| 杨佳明: "核一级稳压器喷雾阀流量特性分析及流量系数计算程序设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, pages 2 - 41 * |
| 祁崇可: "核电厂稳压器喷雾阀阀芯结构和等百分比流量特性补偿研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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| Publication number | Publication date |
|---|---|
| CN116447352B (en) | 2023-09-19 |
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