CN117536179B - Water supply valve system and design method thereof - Google Patents
Water supply valve system and design method thereof Download PDFInfo
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- CN117536179B CN117536179B CN202410027868.4A CN202410027868A CN117536179B CN 117536179 B CN117536179 B CN 117536179B CN 202410027868 A CN202410027868 A CN 202410027868A CN 117536179 B CN117536179 B CN 117536179B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/04—Methods or installations for obtaining or collecting drinking water or tap water from surface water
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
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- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention belongs to the technical field of water supply valve application of water supply engineering, and discloses a water supply valve system and a design method thereof, wherein the water supply valve system specifically comprises at least one water supply valve unit, and each water supply valve unit comprises N water supply valve groups which are arranged in parallel; the N water supply valve groups are respectively and correspondingly arranged at preset elevations of N water supply pipelines connected in parallel; n is more than or equal to 1; each water supply valve group comprises a first maintenance valve, a flow regulating pressure regulating valve and a second maintenance valve which are sequentially arranged on the water supply pipeline. The invention adopts at least one water supply valve unit to divide the elevation and flow of the reservoir into a plurality of sections for stepped water supply so as to solve the water supply problem of the dam with large water-level-fluctuating depth; the water supply problem of the dam with large water level difference depth is further solved through the plurality of water supply valve groups which are arranged in parallel and provided with the flow regulating and pressure regulating valves, and meanwhile, the design and manufacturing difficulty of the flow regulating and pressure regulating valves is reduced; the filter screen at the upstream end of the flow regulating and pressure regulating valve can prevent the valve body from being blocked.
Description
Technical Field
The invention discloses a water supply valve system and a design method thereof, and belongs to the technical field of application of water supply valve systems in water supply engineering.
Background
The water supply reservoir is a form of regulating and supplying water by using the reservoir. The usual water supply modes include the following: first kind: the combined water supply of the hydroelectric generating set and the radial gate is arranged at the downstream of the reservoir, the water is generally supplied after the hydroelectric generating set generates electricity, and when the hydroelectric generating set is blocked from generating electricity, the radial gate is utilized for controlling the water quantity and energy dissipation and water supply. Second kind: the water turbine generator set and the water supply valve unit are combined for water supply, the water is generally supplied after the water turbine generator set generates electricity, and when the water turbine generator set is blocked from generating electricity, the water supply valve unit with a reasonable caliber is utilized for energy dissipation and water supply. Third kind: the water supply valve units are combined to supply water, and water demand can be directly dissipated through different aperture combinations of the water supply valve systems to supply water.
Aiming at dam hinges with high dams, large vaults and large hydro-fluctuation depths, water is generally supplied in the first two combination modes from the energy saving angle. But the radial gate is used for controlling flow energy dissipation water supply, a stilling pool and a water supply runner are required to be arranged, and the requirements on the field are high; if the field is limited, water supply is finished by combining a water turbine generator set and a water supply valve system.
The flow regulating and pressure regulating valve has the advantages of difficult blockage of a slide way, difficult scaling, difficult blockage, small driving device, constant maintenance in certain precision, adjustable precision range, good cavitation resistance and the like, is widely applied to energy dissipation and water supply in water supply engineering at present, but cannot be directly applied to large-scale reservoir water supply engineering with larger water dissipation depth based on the characteristics of wide water head, large flow and high energy dissipation rate of the existing flow regulating and pressure regulating valve equipment.
Disclosure of Invention
The application aims to provide a water supply valve system and a design method thereof, which are used for solving the technical problem that a flow regulating and pressure regulating valve in the prior art cannot be directly applied to water supply in a large reservoir with large water level and large water supply flow. In order to achieve the above object, the present application provides a water supply valve system and a design method thereof, and the specific scheme is as follows:
A water supply valve system comprising at least one water supply valve unit, each water supply valve unit comprising N water supply valve groups arranged in parallel;
the N water supply valve groups are respectively and correspondingly arranged at preset elevations of N water supply pipelines connected in parallel; n is more than or equal to 1;
Each water supply valve group comprises a first maintenance valve, a flow regulating pressure regulating valve and a second maintenance valve which are sequentially arranged on the water supply pipeline.
Preferably, an outlet energy dissipation component is further arranged at the outlet of the flow regulating and pressure regulating valve;
and the outlet energy dissipation component is provided with an opening.
Preferably, each water supply valve group further comprises a filtering device and two pressure detection devices;
the filtering device is positioned between the first maintenance valve and the flow regulating and pressure regulating valve;
the two pressure detection devices are respectively positioned at the upstream end and the downstream end of the filtering device.
Preferably, the two water supply valve units are respectively arranged at preset elevations at the downstream of the reservoir and are used for supplying water to different elevation sections of the reservoir in a stepped manner.
A method of designing a water supply valve system, comprising the steps of:
Step1, determining a water supply scheme according to reservoir water level characteristic parameters and water supply quantity requirements;
step 2, determining the setting elevation of a water supply valve unit in the water supply scheme;
and 3, determining the opening form of an outlet energy dissipation part of the flow regulating and pressure regulating valve in the water supply valve unit.
Preferably, the step2 includes:
calculating the installation elevation of the flow regulating and pressure regulating valve according to a cavitation coefficient formula of the flow regulating and pressure regulating valve and an allowable cavitation coefficient formula drawn according to test data;
And determining the setting elevation of the water supply valve unit according to the installation elevation of the flow regulating and pressure regulating valve.
Preferably, after the step 2, the method further includes:
Determining the opening form of an outlet energy dissipation part of the flow regulating and pressure regulating valve;
the aperture forms include aperture size, aperture arrangement, and total aperture area.
Preferably, determining the form of the opening of the outlet energy dissipation component of the flow regulating and pressure regulating valve specifically includes:
Obtaining flow resistance coefficients of the flow regulating and pressure regulating valve under different working conditions;
And obtaining the opening forms of the outlet energy dissipation parts adapting to different working conditions according to the flow resistance coefficients.
Preferably, after determining the open pore form of the outlet energy dissipating member, the method further comprises:
inputting the installation elevation of the flow regulating and pressure regulating valve and the opening form of the outlet energy dissipation part into a CFD model;
and adopting a single-phase flow model to perform CFD three-dimensional flow field analysis and calculation, and adjusting the opening form of the outlet energy dissipation part until the opening form meeting the cavitation requirement is obtained.
Preferably, before the step 3, the method further includes:
a model machine test in a proportion with the water supply valve system is adopted to obtain working parameters of the water supply valve system, and whether the working parameters meet engineering requirements is judged;
if not, re-planning the allowable cavitation coefficient equation, correcting the installation height of the flow regulating and pressure regulating valve, and repeating the step 2 until the installation height meeting the cavitation and vibration requirements of engineering requirements is obtained.
The beneficial effects are that: the invention adopts at least one water supply valve unit with a flow regulating and pressure regulating valve to be arranged in parallel, and divides the height and flow of the reservoir into a plurality of sections for stepped water supply so as to solve the water supply problem of a dam with large water-level-fluctuating depth; according to the invention, through the combined action of the plurality of water supply valve groups with the flow regulating and pressure regulating valves arranged in parallel, the water supply problem of a dam with large water level difference depth is further solved, and meanwhile, the design and manufacturing difficulty of the flow regulating and pressure regulating valves is reduced; the upstream end of the flow regulating and pressure regulating valve is provided with the filter screen, so that the valve body is prevented from being blocked, and the filter screen is matched with the overhaul valve, so that the flow regulating and pressure regulating valve with a complex structure can still clean dirt under the condition of not disassembling a flange connected with a pipeline.
Drawings
FIG. 1 is a schematic diagram showing connection between a water supply reservoir and a water supply valve unit according to the first embodiment;
Fig. 2 is a schematic structural view of a water supply valve unit in the first and second embodiments;
FIG. 3 is a schematic diagram showing the relationship between the mounting elevation and back pressure of the flow regulating and pressure regulating valve;
Fig. 4 is a schematic structural diagram of a filter screen in the first embodiment and the second embodiment;
fig. 5 is a flow chart of a design method according to a second embodiment of the invention.
In the figure: 1. a reservoir dam body; 2. a water supply pipe; 3. a water supply valve unit; 301. overhauling a butterfly valve; 302. flow regulating and pressure regulating valves; 303. a ball valve; 304. a filter screen; 4. a water outlet tank; 5. a maximum water level; 6. a minimum water level; 7. depth of fall; 8. a high head water supply section; 9. a low head water supply section; 10. mounting elevation; 11. back pressure.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
At present, in a large-flow water supply project of a large reservoir, the water level-fluctuating depth 7 of the reservoir can reach 100m, and the water supply flow interval has more steps and large span. Generally, the height of the reservoir is divided into a plurality of sections, the flow is divided into a plurality of sections, and the water supply requirement is met through a plurality of water supply modes singly or in combination. The water supply is carried out singly or in combination through the water supply modes such as the radial gate, the water turbine generator set and the water supply valve unit 3, for example, the water turbine generator set and the water supply valve unit 3 are matched for water supply, and the radial gate and the water turbine generator set are matched with each other to meet the water supply requirement. Specifically, as shown in fig. 1, in this embodiment, the height of the reservoir is divided into 3 sections, a high-head water supply section 8, a low-head water supply section 9 and a middle section, in this embodiment, a water turbine generator set and a water supply valve unit 3 are used for combined water supply, the water turbine generator set can make full use of the potential energy of the water in the reservoir in this project, and when the water turbine generator set is blocked due to the water head or flow power generation, the water supply valve unit 3 supplies water. The flow and water head generating advantages of the hydroelectric generating set are fully exerted, and the working condition is optimized and simplified. The working condition analysis is completed by the water supply valve unit 3 by adopting a high water head water supply section 8 and a low water head water supply section 9. The rest sections adopt water turbine generator sets to compensate water supply. The whole reservoir is supplied with water in a stepped way. As shown in fig. 1, the high-head water supply section 8 is a section from the highest water level 5 of the reservoir to a preset height downwards, the low-head water supply section 9 is a section from the preset height to the lowest water level 6, and the hydro-fluctuation depth 7 is the height from the highest water level 5 of the reservoir to the lowest water level 6.
However, the existing flow regulating valve 302 does not have the characteristics of wide water head, large flow and high energy dissipation rate, and cannot meet the water supply requirement. The invention simplifies the water supply section of the water supply valve unit 3 in the water supply working condition, definitely regulates the maximum pressure difference of the front valve and the rear valve of the pressure regulating valve 302 to be 95m, ensures the energy dissipation and overcurrent range to be 2-15.5 m 3/s, designs a water supply valve system, and designs a reservoir water supply system meeting the requirement of the large water dissipation depth 7 based on the flow regulating pressure regulating valve 302.
Embodiment one:
A water supply valve system comprising at least one water supply valve unit 3, each water supply valve unit 3 comprising N water supply valve groups arranged in parallel; the N water supply valve groups are respectively and correspondingly arranged at preset elevations of N water supply pipelines 2 which are connected in parallel; n is more than or equal to 1; each water supply valve group comprises a first maintenance valve, a flow regulating pressure regulating valve 302 and a second maintenance valve which are sequentially arranged on the water supply pipeline 2.
In particular, the water supply valve system in this embodiment includes one hydro-generator set and one water supply valve unit 3 for combined water supply, and it should be understood that in other embodiments, the water supply valve system may further include a plurality of water supply valve units 3 for combined water supply. In this embodiment, the water supply valve unit 3 includes two water supply valve groups, and the water supply engineering in this embodiment has a large scale and a large water supply flow, so that both of the two water supply valve groups are large valves with large calibers. As shown in fig. 1, one end of a water supply pipeline 2 passes through a reservoir dam body 1, the other end is connected with a water outlet tank 4, the water supply pipeline 2 is split into two water supply pipelines 2 between the reservoir dam body 1 and the water outlet tank 4, two water supply valve sets are respectively arranged at preset elevations of the two water supply pipelines 2 which are connected in parallel, the two water supply valve sets are connected in parallel for water supply of low-water-head section high-flow energy dissipation and high-water-head section low-flow energy dissipation, and a hydroelectric generating set is used for water supply of other sections and flow. The invention adopts the parallel arrangement of a plurality of water supply valve groups, thereby reducing the design and manufacturing difficulty of the flow regulating and pressure regulating valve 302; by dividing the water supply section into a high-water-head water supply section 8 and a low-water-head water supply section 9, dam water supply with large water-level-fluctuating depth 7 is reasonably partitioned, and the design and manufacturing difficulty of the flow regulating and pressure regulating valve 302 is further reduced. As shown in fig. 2, each water supply valve group includes a first service valve, a flow regulating pressure regulating valve 302, and a second service valve, which are sequentially provided on the water supply pipe 2.
Specifically, the first service valve may be a butterfly valve, a gate valve, a plug valve, a stop valve, etc., and in this embodiment, the first service valve is a service butterfly valve 301, the second service valve is a ball valve 303, and the ball valve 303 can meet the water flow smoothness requirement after the service and flow regulating pressure regulating valve 302.
Further, an outlet energy dissipation component is further disposed at the outlet of the flow regulating and pressure regulating valve 302; and the outlet energy dissipation component is provided with an opening.
Specifically, in this embodiment, an outlet energy dissipation member is disposed at the outlet of the flow regulating and pressure regulating valve 302, and an opening is disposed on the outlet energy dissipation member, where the form of the opening in this embodiment is determined according to a system scheme, and the outlet energy dissipation member is used for dissipating energy of water flowing through the flow regulating and pressure regulating valve 302.
Further, each water supply valve group further comprises a filtering device; the filter device is located between the first service valve and the flow regulating and pressure regulating valve 302.
Specifically, as shown in fig. 2, the water supply valve set further includes a filtering device, for the large-caliber flow regulating pressure regulating valve 302 of the present invention, the design and manufacture are relatively complex, and dirt in the valve should be cleaned on the premise of not disassembling the flange connected with the pipeline, so in this embodiment, the filtering device is disposed in front of the valve of the flow regulating pressure regulating valve 302, and the filtering device is located between the overhauling butterfly valve 301 and the flow regulating pressure regulating valve 302, specifically, in this embodiment, the filtering device is a filtering screen 304, as shown in fig. 4, the filtering screen 304 of this embodiment has the characteristics of strong overflow capability, large rigidity, small head loss, difficult blockage and convenient overhauling, and because the flow regulating pressure regulating valve 302 has complex structure and difficult overhauling, the filtering screen 304 can effectively prevent the flow regulating pressure regulating valve 302 from being blocked.
Further, each water supply valve group further comprises two pressure detection devices; the two pressure detection devices are respectively positioned at the upstream end and the downstream end of the filtering device.
Specifically, the two pressure detection devices are respectively located at different positions of the water supply pipeline 2 and are disposed at the upstream and downstream sides of the filter screen 304, and specifically, the filter screen 304 is located between the two pressure detection devices, it should be understood that, in other embodiments, the two pressure detection devices may also include the service butterfly valve 301 and the filtering device. The pressure difference between the two pressure detecting devices is obtained for rapidly judging whether the valve on the water supply pipeline 2 between the two pressure detecting devices is blocked. Specifically, in this embodiment, the pressure detecting device is a pressure sensor, and the two pressure sensors are respectively disposed on the front and rear sides of the filter screen 304, and are configured to obtain the front and rear pressure values of the filter screen 304 in real time, and when the difference between the readings of the two pressure sensors exceeds a preset value, it is indicated that the filter screen 304 is blocked, and the filter screen 304 needs to be overhauled or cleaned.
Furthermore, the two water supply valve units 3 are respectively arranged at preset elevations at the downstream of the reservoir in parallel and are used for supplying water to sections with different elevations of the reservoir in a stepped manner.
Specifically, in other embodiments, another water supply valve unit 3 is used to replace the hydroelectric generating set, the two water supply valve units 3 are respectively disposed at different preset elevations at the downstream of the reservoir, the preset elevations of the two water supply valve units 3 may be identical, and the two water supply valve units may be disposed in the same sluice chamber, or may be disposed at different preset elevations, respectively disposed in different sluice chambers, and specifically, a suitable setting scheme is selected in combination with construction cost and the like. The two water supply valve units 3 cooperate to complete water supply in each section at a flow rate.
Embodiment two:
Step 1, determining a water supply scheme according to reservoir water level characteristic parameters and water supply quantity requirements; step 2, determining the setting elevation of the water supply valve unit 3 in the water supply scheme; and 3, determining the opening form of the outlet energy dissipation part of the flow regulating and pressure regulating valve 302 in the water supply valve unit 3.
Specifically, the design method of the water supply valve system in the first embodiment includes: firstly, according to the water level characteristic parameters of the water supply reservoir and the water supply quantity requirements, a water supply scheme is determined, and the water supply scheme also comprises a system structural form, namely the device of each water supply valve group, the pipe diameter of the water supply pipeline 2 and the like. Specifically, in this embodiment, the water level of the reservoir is up to 7m, the maximum pressure difference between the front and rear of the flow regulating and pressure regulating valve 302 is up to 95m, and the water supply flow is divided into 3 sections by the reservoir elevation, and the flow size section is divided into 5 sections. In the embodiment, a water turbine generator set is selected to be matched with a water supply valve unit 3, so that the water supply requirement of each combined section is met. According to the above-described scheme, it is clear that the flow regulating and pressure regulating valve 302 in the water supply valve unit 3 is used for low-head section, high-flow energy-dissipating water supply and high-head section, low-flow energy-dissipating water supply. It is determined that two water supply valve sets are used for supplying water in parallel, and the two water supply valve sets are matched for use, so that the design and manufacturing difficulty of the flow regulating and pressure regulating valve 302 in the water supply valve sets is reduced.
Subsequently, according to the water supply scheme, the installation height 10 of the flow regulating and pressure regulating valve 302 in the water supply valve block is determined, and as shown in fig. 1, the water supply valve unit 3 is generally disposed at the end of the water supply pipe 2, followed by the water outlet tank 4, wherein the installation height 10 of the flow regulating and pressure regulating valve 302 determines the installation height of the water supply valve unit 3 and the elevation of the building surface of the valve chamber, and thus, the installation height 10 of the flow regulating and pressure regulating valve 302 in the water supply valve unit 3 in the water supply scheme should be determined, and then the installation height of the water supply valve unit 3 should be determined. The installation height 10 of the flow regulating and pressure regulating valve 302 should be such that the cavitation coefficient is greater than the allowable cavitation coefficient, i.e., σ > σ Allow for , to ensure that no more cavitation damage than allowable occurs during various operating conditions.
Then, the opening form of the outlet energy dissipation member of the flow regulating and regulating valve 302 in the water supply valve unit 3 is determined, and the opening form of the outlet energy dissipation member of the flow regulating and regulating valve 302 is related to the pressure regulating and flow regulating capacity of the flow regulating and regulating valve 302, so that the cavitation characteristics of the flow regulating and regulating valve 302 are affected, and therefore, it is important to select an appropriate opening form of the outlet energy dissipation member.
Finally, construction is performed according to the set elevation and design scheme, and the water supply valve unit 3 is installed.
Further, determining the setting elevation of the water supply valve unit 3 in the water supply scheme includes: according to a cavitation coefficient formula, calculating a cavitation coefficient of the flow regulating and pressure regulating valve 302, comparing the cavitation coefficient with a planned allowable cavitation coefficient sigma Allow for , and obtaining the installation height 10 of the flow regulating and pressure regulating valve 302 by trial calculation; the installation height of the water supply valve unit 3 is determined according to the installation height 10 of the flow regulating and pressure regulating valve 302.
Specifically, the installation height 10 of the flow regulating and pressure regulating valve 302 is calculated, and the cavitation coefficient sigma is calculated according to the following formula:
Wherein: h 1 is the difference between the valve inlet head, i.e. the reservoir head, and the mounting elevation 10 of the flow regulating and pressure regulating valve 302, in meters (m); h 2 is the water head of the valve outlet, namely the difference between the installation height 10 of the flow regulating and pressure regulating valve 302 and the water head of the water outlet tank 4, and the unit is meter (m); h At is the height of the water column corresponding to the local atmospheric pressure, and the unit is meter (m); h d is the height of a water column corresponding to the saturated steam pressure of water at 20 ℃, and the unit is meter (m); v 2 is the pipeline media flow rate in meters per second (m/s); g is gravity acceleration, 9.81m/s 2 is taken. In the above formula, the water head of the water tank 4 and the installation height 10 of the flow regulating and pressure regulating valve 302 are variables.
In the case where the elevation of the flow regulating and pressure regulating valve 302 is fixed: as shown in fig. 3, the difference in elevation between the water head of the water tank 4 and the installation elevation 10 of the flow regulating and pressure regulating valve 302 is the back pressure 11, that is, the higher the water head of the water tank 4 is, the higher the water tank 4 is, that is, the water tank 4 is set high Cheng Yue is, that is, the larger the H 2 is, the larger the back pressure 11 is, that is, the H 2 is positively correlated with the back pressure 11; from the cavitation coefficient formula it can be concluded that: with the height of the flow regulating valve 302 fixed, the greater the H 2, the greater the cavitation coefficient. From the above, the greater the back pressure 11, the greater the cavitation coefficient, and the greater the cavitation coefficient, the greater the cavitation suppressing ability, that is, the greater the back pressure 11, the greater the cavitation suppressing ability. According to the data accumulation of the data of the field test in the embodiment, the rule is summarized to obtain σ Allow for =0.0563e0.0319x, wherein x is the valve opening, e is a constant, e= 2.718281828459, and when the installation height 10 of the flow regulating and regulating valve 302 and the water head of the water outlet tank 4 are adjusted, the corresponding H 1 and H 2 meet the calculated cavitation coefficient σ > σ Allow for , the installation height 10 of the flow regulating and regulating valve 302 is reasonable and feasible. Therefore, the installation height 10 of the flow regulating and pressure regulating valve 302 and the running water level of the water outlet tank 4 which meet the requirements are obtained through calculation, and then the installation height 10 of the flow regulating and pressure regulating valve 302 is used for determining the installation height of the water supply valve unit 3 and the water supply pipeline 2 where the water supply valve unit 3 is located.
Specifically, after the step 2, the method further includes: determining the form of the opening of the outlet energy dissipation member of the flow regulating and pressure regulating valve 302; the aperture forms include aperture size, aperture arrangement, and total aperture area. The open pore form of the outlet energy dissipation member of the flow regulating and regulating valve 302 in the water supply valve unit 3 is determined, and the open pore form of the outlet energy dissipation member of the flow regulating and regulating valve 302 is related to the pressure regulating and flow regulating capacity of the flow regulating and regulating valve 302, so that the cavitation characteristics of the flow regulating and regulating valve 302 are affected, and therefore, it is important to select an appropriate open pore form of the outlet energy dissipation member.
Specifically, the outlet of the flow regulating and pressure regulating valve 302 is provided with an outlet energy dissipation component, and the outlet energy dissipation component is provided with an opening, wherein the size, the arrangement mode, the total area of the opening and the like of the opening are related to the pressure regulating and flow regulating capacity of the flow regulating and pressure regulating valve 302, and conventionally, the opening form is determined by adopting a linear relation of single flow characteristics, which can lead to small regulating range and inaccurate regulating performance of the flow regulating and pressure regulating valve 302.
Specifically, for the characteristics of large pressure difference before and after the valve and large flow change range of the flow regulating and regulating valve 302 in the present embodiment, an open pore form cannot be determined by adopting a single flow characteristic linear relation, in the present embodiment, flow resistance coefficients of the flow regulating and regulating valve 302 under the two working conditions are obtained by adopting different working conditions for a high water head section, a small flow and a low water head section and a large flow, two different flow resistance coefficients are obtained, for other working conditions in a middle section, a hydroelectric generating set is adopted to compensate, a complex working condition is simplified into two working conditions of a high water head section, a small flow and a large flow, according to the flow resistance coefficients of the two working conditions, the open pore form of a corresponding outlet energy dissipation component provided by a manufacturer is referred to the flow regulating valve 302, flow field simulation (computational fluid dynamics, computational Fluid Dynamics, CFD) is performed by using a CFD model, flow and cavitation characteristics of a plurality of open pore schemes under each working condition are compared, and the open pore form is selected, so that the open pore form simultaneously satisfies the flow resistance coefficients under the two working conditions.
Further, after determining the open pore form of the outlet energy dissipation member, the method further comprises: inputting the installation height 10 of the flow regulating and pressure regulating valve 302 and the open pore form of the outlet energy dissipation component into a CFD model; and adopting a single-phase flow model to perform CFD three-dimensional flow field analysis and calculation, and adjusting the opening form of the outlet energy dissipation part until the opening form meeting the cavitation requirement is obtained.
Specifically, parameters of the installation height 10 of the flow regulating and pressure regulating valve 302 and the opening form of the outlet energy dissipation component obtained through calculation are input into the CFD model; performing CFD flow field analysis and calculation by adopting a single-phase flow model to obtain the pressure in the valve body of the flow regulating and pressure regulating valve 302 under each working condition; if the pressure in any area of the valve body of the flow regulating and pressure regulating valve 302 is greater than the preset pressure, it is reasonable and feasible to determine the design of the opening form of the outlet energy dissipating component. If the pressure in any area of the valve body of the flow regulating and pressure regulating valve 302 is less than or equal to the preset pressure, the opening form of the outlet member needs to be adjusted until the opening form is obtained that the pressure in any area of the valve body of the flow regulating and pressure regulating valve 302 is greater than the preset pressure. Specifically, in this embodiment, under each working condition, if a low pressure area of less than 10000Pa appears in the valve body, it is considered that cavitation may occur in the flow regulating and pressure regulating valve 302. By this step the form of the outlet energy dissipating means of the flow regulating pressure regulating valve 302 is determined.
Specifically, the embodiment further includes performing three-dimensional flow field simulation through a CFD model to determine a form of the filtering device, and specifically, in the embodiment, the filtering device is a filter screen 304, as shown in fig. 4, which is a schematic structural diagram of the filter screen 304 obtained through simulation in the embodiment.
Further, a model machine in a proportion to the water supply valve system is adopted to test and obtain working parameters of the water supply valve system, and whether the working parameters meet engineering requirements is judged; if not, the allowable cavitation coefficient equation is re-formulated, and the installation elevation 10 of the flow regulating and pressure regulating valve 302 is corrected until the working parameters meeting the cavitation and vibration requirements of engineering requirements are obtained, and the corresponding installation elevation 10 enabling the working parameters to meet the requirements is obtained.
Specifically, in this embodiment, the method further includes: the model test of the whole water supply valve system is carried out by using a model machine with the ratio of 1:5, the model machine is scaled down in equal proportion with the water supply valve system determined in the first embodiment and the second embodiment, the working parameters such as the flow resistance coefficient, the flow regulation characteristic, the cavitation characteristic, the vibration characteristic and the like of the water supply valve system are tested by the model machine, whether the working parameters meet engineering requirements or not is judged, namely, the actual measurement data of the model machine are compared with the simulation result of the CFD model in the steps, if the requirements are met, the flow regulating and regulating valve 302 with the open pore form is put into production. If not, repeating the step 2, namely re-planning the allowable cavitation coefficient equation sigma Allow for , correcting the installation height 10 of the flow regulating and pressure regulating valve 302, repeating the step 2, performing CFD model simulation calculation, and correcting and fine-tuning the opening form of the outlet energy dissipation component. Until the mounting elevation 10 and the opening form of the flow regulating and pressure regulating valve 302 meeting cavitation and vibration requirements are obtained. The finishing arrangement has a flow regulating and pressure regulating valve 302 in the form of an opening as described above.
Specifically, in this embodiment, performing CFD model flow field simulation further includes: the outlet flow state of the flow regulating and regulating valve 302 is smoothly connected, and the transition is smooth. In this embodiment, the ball valve 303 is adopted, and the structure is smooth and smooth, so that the flow cross section in the flow regulating and pressure regulating valve 302 can be stably transited when the annular shape in the valve cavity is converged to the axis of the outlet, and vibration, noise and cavitation caused by water flow disturbance due to the structural change of the flow passage are avoided.
Specifically, the ball valve 303 is adopted in the invention, because the ball valve 303 can simultaneously meet the requirements of maintenance and smooth water flow.
Finally, the water supply valve system is installed according to the arrangement structure of the first embodiment and the design result of the second embodiment. The hydraulic generator unit comprises a water supply valve system, an overhaul butterfly valve 301 of the water supply valve group, a filter screen 304, a pressure sensor, a flow regulating and pressure regulating valve 302 and a ball valve 303.
As shown in FIG. 5, the water supply scheme is determined according to reservoir parameters and water supply requirements, and then the setting elevation of the water supply valve is determined; the installation height 10 of the flow regulating and pressure regulating valve 302 in the water supply valve unit 3 is obtained through theoretical research and calculation, then the opening form of the outlet energy dissipation part is planned, then the obtained parameters such as the installation height 10, the opening form and other parts in the water supply valve system are substituted into the CFD model, CFD three-dimensional flow field analysis is carried out, whether the water supply valve system meets the relevant requirements of cavitation characteristics or not is judged, if not, the opening form of the outlet energy dissipation part is regulated; if so, after CFD three-dimensional flow field analysis, a 1:5 scaling model test is carried out, whether the water supply valve system meets engineering requirements is judged, if so, the flow regulating and regulating valve 302 is processed, if not, a cavitation coefficient equation sigma Allow for is redeveloped, the installation height 10 of the flow regulating and regulating valve 302 in the water supply valve system is calculated, the open pore form is redeveloped, the open pore form is adjusted through CFD three-dimensional flow field analysis, and the steps are repeated until the engineering requirements are met.
According to the invention, theoretical research calculation, CFD model three-dimensional flow field simulation and 1:5 model machine test are adopted to simulate and research a key valve and the whole water supply valve system, so that the engineering design is feasible, safe and reliable. The invention solves the water supply problem of the dam with the large hydro-fluctuation depth 7 by utilizing the limited space, saves engineering investment, and ensures the operation safety of the water supply engineering through multiple verification.
The invention adopts at least one water supply valve unit 3 with a flow regulating and pressure regulating valve 302 to be arranged in parallel, and divides the height and flow of the reservoir into a plurality of sections for stepped water supply so as to solve the problem of dam water supply with a large water level fluctuating depth 7; according to the invention, through the combined action of the plurality of water supply valve groups with the flow regulating and pressure regulating valve 302 arranged in parallel, the water supply problem of a dam with the water level difference 7 is further solved, and meanwhile, the design and manufacturing difficulty of the flow regulating and pressure regulating valve 302 is reduced; the filter screen 304 is arranged at the upstream end of the flow regulating and pressure regulating valve 302 to prevent the valve body from being blocked, and the filter screen 304 is matched with the maintenance valve, so that the flow regulating and pressure regulating valve 302 with a complex structure can still clean dirt under the condition of not disassembling a flange connected with a pipeline.
The foregoing examples merely represent several embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention should be determined by the appended claims.
Claims (7)
1. The design method of the water supply valve system based on the high-head large reservoir is characterized by comprising the following steps of:
Step1, determining a water supply scheme according to reservoir water level characteristic parameters and water supply quantity requirements;
the water supply system in the water supply scheme comprises at least one water supply valve unit and a water turbine generator set for combined water supply, each water supply valve unit comprises N water supply valve groups which are arranged in parallel, the N water supply valve groups are connected in parallel for water supply, the water supply system is used for low-head section large-flow energy dissipation water supply and high-head section small-flow energy dissipation water supply, and the water turbine generator set is used for water supply of other sections and flow rates;
the N water supply valve groups are respectively and correspondingly arranged at preset elevations of N water supply pipelines connected in parallel, N is more than or equal to 1, one end of each water supply pipeline penetrates through the reservoir dam body, and the other end of each water supply pipeline is connected with the water outlet tank;
Each water supply valve group comprises a first maintenance valve, a flow regulating pressure regulating valve and a second maintenance valve which are sequentially arranged on the water supply pipeline;
an outlet energy dissipation part is arranged at the outlet of the flow regulating and pressure regulating valve;
The outlet energy dissipation component is provided with an opening;
each water supply valve group further comprises a filtering device;
the filtering device is positioned between the first maintenance valve and the flow regulating and pressure regulating valve;
step 2, determining the setting elevation of a water supply valve unit in the water supply scheme;
Calculating the installation height of the flow regulating and pressure regulating valve according to a cavitation coefficient formula of the flow regulating and pressure regulating valve and an allowable cavitation coefficient formula drawn according to test data, wherein the allowable cavitation coefficient formula is sigma Allow for =0.0563e0.0319x, x is the opening of the valve, e is a constant, and e= 2.718281828459;
determining the setting elevation of the water supply valve unit according to the installation elevation of the flow regulating and pressure regulating valve;
and 3, determining the opening form of an outlet energy dissipation part of the flow regulating and pressure regulating valve in the water supply valve unit.
2. The method of designing a water supply valve system according to claim 1, further comprising, after the step 2:
Determining the opening form of an outlet energy dissipation part of the flow regulating and pressure regulating valve;
the aperture forms include aperture size, aperture arrangement, and total aperture area.
3. The method of designing a water supply valve system according to claim 2, wherein determining the form of the opening of the outlet energy dissipating member of the flow regulating and pressure regulating valve specifically comprises:
Obtaining flow resistance coefficients of the flow regulating and pressure regulating valve under different working conditions;
And obtaining the opening forms of the outlet energy dissipation parts adapting to different working conditions according to the flow resistance coefficients.
4. A method of designing a water supply valve system according to claim 3, further comprising, after determining the open pore form of the outlet energy dissipating member:
inputting the installation elevation of the flow regulating and pressure regulating valve and the opening form of the outlet energy dissipation part into a CFD model;
and adopting a single-phase flow model to perform CFD three-dimensional flow field analysis and calculation, and adjusting the opening form of the outlet energy dissipation part until the opening form meeting the cavitation requirement is obtained.
5. The method of designing a water supply valve system according to claim 4, further comprising, before the step 3:
a model machine test in a proportion with the water supply valve system is adopted to obtain working parameters of the water supply valve system, and whether the working parameters meet engineering requirements is judged;
if not, re-planning the allowable cavitation coefficient equation, correcting the installation height of the flow regulating and pressure regulating valve, and repeating the step 2 until the installation height meeting the cavitation and vibration requirements of engineering requirements is obtained.
6. The method of designing a water supply valve system according to claim 1, wherein each of the water supply valve sets further comprises two pressure detecting means;
the two pressure detection devices are respectively positioned at the upstream end and the downstream end of the filtering device.
7. The method of claim 1 to 6, wherein the number of the water supply valve units is two, and the water supply valve units are respectively arranged at preset elevations at the downstream of the reservoir and are used for supplying water to the different elevation sections of the reservoir in a stepped manner.
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