Ecological flow discharge system and discharge method based on discharge pipe

Abstract

The invention discloses an ecological flow discharge system and discharge method based on a discharge pipe, and the system is applied to a diversion type hydropower station, and comprises the discharge pipe, the inlet end of the discharge pipe is connected with a river blocking facility; the inlet end of the bypass pipe is connected with the discharge pipe, and the bypass pipe is used for discharging ecological flow; the pipeline flow meter is arranged on the bypass pipe, and the pipeline flow meter is used for monitoring flow data of the bypass pipe; the control valve is arranged on the bypass pipe, and the control valve is used for adjusting the ecological flow according to the flow data. According to the embodiment of the invention, the safety of ecological flow discharge of the diversion type hydropower station can be effectively improved, and the operability of ecological flow discharge is improved. The method can be widely applied to the technical field of water conservancy and hydropower.

Description

Technical Field

[0001] This application relates to the technical field of water conservancy and hydropower, and particularly relates to an ecological flow discharge system and a discharge method based on a discharge pipe. Background Art

[0002] Due to the need to build river blocking facilities on natural rivers, small hydropower stations often bring the problem of insufficient downstream ecological flow. Ecological flow is the flow (water volume, water level) and process required to meet the ecological protection requirements of the river downstream of the river blocking facilities of small hydropower stations and maintain the basic structure and function of the ecosystem. Diversion-type hydropower stations build river blocking facilities on the river, and then divert water from the reservoir to the power plant through diversion facilities for power generation, resulting in a dewatered section in the natural river between the factory and the dam, which has an impact on the ecological environment and causes some economic benefits losses. In related technologies, some early-built diversion-type hydropower stations do not have special buildings for discharging ecological flow, while some diversion-type hydropower stations are equipped with sediment discharge pipes or emptying pipes, which can discharge ecological flow. However, since the discharge pipes are mainly used for short-term large-flow sediment discharge or emptying the reservoir capacity, long-term operation may affect the safety of the dam, and it is inconvenient to operate when discharging ecological flow.

[0003] In summary, the technical problems existing in the related technologies need to be improved. Summary of the Invention

[0004] The main purpose of the embodiments of this application is to propose an ecological flow discharge system and a discharge method based on a discharge pipe, which can effectively improve the safety of ecological flow discharge of diversion-type hydropower stations and improve the operability of ecological flow discharge.

[0005] To achieve the above object, on the one hand, an embodiment of this application proposes an ecological flow discharge system based on a discharge pipe, which is applied to a diversion-type hydropower station. The system includes:

[0006] A discharge pipe, the inlet end of which is connected to a river blocking facility;

[0007] A bypass pipe, the inlet end of which is connected to the discharge pipe, and the bypass pipe is used for ecological flow discharge;

[0008] A pipeline flowmeter, which is arranged on the bypass pipe, and the pipeline flowmeter is used to monitor the flow data of the bypass pipe;

[0009] A control valve, which is arranged on the bypass pipe, and the control valve is used to adjust the ecological flow according to the flow data.

[0010] In some embodiments, the bypass pipe includes:

[0011] A bypass vertical pipe section, the inlet end of the bypass vertical pipe section is connected above the pipeline of the drainage pipe, and the bypass vertical pipe section is used to divert the water flow in the drainage pipe into the bypass pipe;

[0012] A bypass horizontal pipe section, the inlet end of the bypass horizontal pipe section is connected to the outlet end of the bypass vertical pipe section, and the bypass horizontal pipe section is used to discharge the ecological flow.

[0013] In some embodiments, the pipeline flowmeter is arranged on the bypass vertical pipe section.

[0014] In some embodiments, the control valve is arranged on the bypass horizontal pipe section.

[0015] In some embodiments, the system further includes:

[0016] A drainage valve, the drainage valve is arranged on the drainage pipe, and the drainage valve is located downstream of the connection between the bypass pipe and the drainage pipe, and the drainage valve is used to control the working state of the drainage pipe.

[0017] In some embodiments, the setting steps of the bypass pipe include:

[0018] Calculating the expected pipeline data according to the approved ecological flow parameters and the preset water head parameters; wherein, the expected pipeline data includes the pipeline inner diameter data and the expected length data;

[0019] Calculating the first length data of the bypass vertical pipe section according to the pipeline inner diameter data through a preset hydraulics algorithm;

[0020] Determining the second length data of the bypass horizontal pipe section according to the first length data and the expected length data;

[0021] Setting the bypass pipe according to the first length data, the second length data and the pipeline inner diameter data.

[0022] In some embodiments, the setting steps of the pipeline flowmeter include:

[0023] Determining the expected installation position according to the first length data and the preset installation position parameters; wherein, the preset installation position parameters are determined by the preset hydraulics algorithm, and the preset installation position parameters include the upstream pipe section length parameter and the downstream pipe section length parameter;

[0024] Installing the pipeline flowmeter according to the expected installation position.

[0025] To achieve the above object, another aspect of the embodiments of the present application proposes an ecological flow discharge method based on a drainage pipe, which is applied to the above system, and the method includes the following steps:

[0026] The flow data is dynamically monitored by a pipeline flowmeter;

[0027] Analyze the flow data to adjust the ecological flow discharge through the control valve.

[0028] In some embodiments, the dynamically monitoring the flow data by the pipeline flowmeter includes:

[0029] Dynamically collect pipeline flow velocity data through the pipeline flowmeter; wherein, the pipeline flow velocity data includes the water flow velocity data in the bypass pipe;

[0030] Calculate the flow data based on the pipeline flow velocity data and the pipeline inner diameter data.

[0031] In some embodiments, the analyzing the flow data to adjust the ecological flow discharge through the control valve includes:

[0032] Analyze the flow data and the expected ecological flow threshold to obtain an expected opening value;

[0033] Adjust the opening of the control valve according to the expected opening value to perform ecological flow discharge regulation.

[0034] The embodiments of the present application at least include the following beneficial effects: The present application provides an ecological flow discharge system and method based on a discharge pipe. This solution connects the inlet end of the discharge pipe to a river-blocking facility, and connects the inlet end of the bypass pipe to the discharge pipe to discharge ecological flow through the bypass pipe. At the same time, in the embodiments of the present invention, a pipeline flowmeter is provided on the bypass pipe to monitor the flow data of the bypass pipe, and the flow discharged from the bypass pipe is adjusted according to the flow data through a control valve provided on the bypass pipe, thereby realizing ecological flow regulation, effectively improving the safety of ecological flow discharge in a diversion-type hydropower station, and improving the operability of ecological flow discharge. Description of the Drawings

[0035] Figure 1 is a cross-sectional view of the ecological flow discharge system based on a discharge pipe provided by the embodiments of the present application;

[0036] Figure 2 is a top view of the ecological flow discharge system based on a discharge pipe provided by the embodiments of the present application;

[0037] Figure 3 is a schematic flow chart of the steps for calculating the expected pipeline data of the bypass pipe provided by the embodiments of the present application;

[0038] Figure 4It is a schematic diagram of the step flow of the ecological flow discharge method based on the discharge pipe provided by the embodiments of the present application. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application detailed in the appended claims.

[0040] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the words "if", "when" as used herein can be interpreted as "when...", "while...", or "in response to determining".

[0041] The terms "at least one", "a plurality of", "each", "any one", etc. used in the present application, at least one includes one, two or more than two, a plurality of includes two or more than two, each refers to each of the corresponding plurality, and any one refers to any one of the plurality.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0043] Before the detailed description of the embodiments of the present application, some nouns and terms involved in the embodiments of the present application will be described first, and the nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0044] Ecological flow: It refers to the minimum flow required to maintain the health and basic functions of ecosystems such as rivers, lakes or oceans. Its core goal is to ensure the stability and sustainability of ecosystems.

[0045] Diversion-type hydropower station: It refers to a hydropower station that generates electricity by concentrating the natural river drop through diversion structures (such as open channels and tunnels). Among them, by building a low dam and a sluice, the water flow is guided to the downstream forebay through a diversion channel or tunnel to form the required water head (water level difference) for power generation.

[0046] Small hydropower stations often bring problems of insufficient downstream ecological flow due to the need to build river-blocking facilities on natural rivers. Ecological flow is the flow (water volume, water level) and process required to meet the ecological protection requirements of the downstream river of the river-blocking facilities of small hydropower stations and maintain the basic structure and function of the ecosystem. Diversion-type hydropower stations build river-blocking facilities on the river, and then divert water from the reservoir to the power plant through diversion facilities for power generation, resulting in a dewatered reach in the natural river between the power plant and the dam, which has an impact on the ecological environment and causes some economic benefits losses. In related technologies, although some early-built diversion-type hydropower stations are equipped with sand discharge pipes for regular sand discharge or emptying bottom pipes for emptying the reservoir capacity in special times, these hydropower stations can discharge ecological flow through the sand discharge pipe or the emptying pipe (collectively referred to as the discharge pipe), but the discharge pipe is mainly used for short-term large-flow sand discharge or emptying the reservoir capacity, and its flow channel structure is not suitable for long-term small-flow operation, and continuous or frequent opening and closing are likely to cause water flow pulsation, resulting in vibration of the dam body or auxiliary structures, and long-term operation may induce fatigue damage of the metal structure, affecting the safety of the dam structure and making it difficult to achieve safe and stable ecological flow discharge. In addition, the diameter of the discharge pipe is generally large, and for power stations with relatively small generally approved ecological flow, there are problems such as inconvenient operation and difficult quantitative monitoring.

[0047] In view of this, the embodiments of the present application provide an ecological flow discharge system and a discharge method based on a discharge pipe. The solution includes a discharge pipe, a bypass pipe, a pipeline flowmeter, and a control valve. Correspondingly, the embodiments of the present invention divert a flow from the discharge pipe through the bypass pipe for ecological flow discharge. At the same time, the embodiments of the present invention monitor the flow data of the bypass pipe through the pipeline flowmeter and adjust the flow of the bypass pipe through the control valve according to the flow data for ecological flow regulation, effectively improving the safety of ecological flow discharge of diversion-type hydropower stations and improving the operability of ecological flow discharge.

[0048] Refer to Figure 1 and Figure 2 As shown in, the ecological flow discharge system based on the discharge pipe provided by the embodiments of the present invention is applied to a diversion-type hydropower station. The system includes a discharge pipe 130, a bypass pipe 150, a pipeline flowmeter 160, and a control valve 170. Among them, Figure 2In the figure, A represents the schematic diagram of the lower structure, and B represents the schematic diagram of the upper structure. Specifically, in the embodiment of the present invention, the inlet end of the drainage pipe 130 is connected to 120. Among them, in the embodiment of the present invention, the drainage pipe 130 is used for discharging sediment in a large flow rate in a short time or emptying the reservoir capacity. For example, in the embodiment of the present invention, the drainage pipe 130 may include a sediment discharge pipe or a bottom emptying pipe. Correspondingly, in the embodiment of the present invention, the inlet end of the bypass pipe 150 is connected to the drainage pipe 130 to discharge the ecological flow. Among them, in the embodiment of the present invention, the water flow in the upstream reservoir area 110 of 120 passes through the drainage pipe 130, enters the bypass pipe 150 from the inlet end of the bypass pipe 150, and is discharged from the outlet end of the bypass pipe 150 to realize the discharge of the ecological flow. In addition, in the embodiment of the present invention, the pipeline flowmeter 160 is arranged on the bypass pipe 150 to monitor the water flow rate in the bypass pipe 150 through the pipeline flowmeter 160 to obtain the corresponding flow rate data. At the same time, in the embodiment of the present invention, the control valve 170 is arranged on the bypass pipe 150 to control the water flow rate in the bypass pipe 150 through the control valve 170. Correspondingly, in the embodiment of the present invention, the flow rate of the bypass pipe 150 is monitored in real time through the pipeline flowmeter 160, and then the control valve 170 is controlled and adjusted according to the monitored flow rate data, realizing the discharge and regulation of the ecological flow, thereby effectively improving the safety of the ecological flow discharge of the diversion type hydropower station and improving the operability of the ecological flow discharge.

[0049] Refer to Figure 1 , in some embodiments of the present invention, the bypass pipe 150 includes a bypass vertical pipe section and a bypass horizontal pipe section. Specifically, in the embodiment of the present invention, the inlet end of the bypass vertical pipe section is connected above the pipeline of the drainage pipe 130 to drain the water flow in the drainage pipe 130 into the bypass pipe 150 through the inlet end of the bypass vertical pipe section. It is easy to understand that since there is often sediment in the drainage pipe 130, in order to avoid damage or influence on the bypass pipe 150 caused by sediment, etc., in the embodiment of the present invention, the contact surface between the bypass vertical pipe section and the drainage pipe 130 is set above the pipeline of the drainage pipe 130, that is, the upper side pipeline surface, so as to effectively reduce the sediment, etc. being drained into the bypass pipe 150, effectively improving the service life and stability of the bypass pipe 150. In addition, in the embodiment of the present invention, the inlet end of the bypass horizontal pipe section is connected to the outlet end of the bypass vertical pipe section. Among them, in the embodiment of the present invention, the water flow diverted from the drainage pipe 130 into the bypass vertical pipe section flows through the bypass horizontal pipe section and is discharged from the outlet end of the bypass horizontal pipe section to realize the discharge of the ecological flow.

[0050] Refer to Figure 1 and Figure 2, in some embodiments of the present invention, the pipeline flowmeter 160 is arranged on the bypass vertical pipe section. Specifically, whether there is gas or cavity in the bypass pipe 150 will affect the measurement accuracy of the pipeline flowmeter 160. For example, when the water flow in the bypass pipe 150 is not full or gas adheres to the electrodes, the flow data monitored by the pipeline flowmeter 160 will be inaccurate. Therefore, in the embodiments of the present invention, by arranging the pipeline flowmeter 160 on the bypass vertical pipe section, it is ensured that the water flow passing through the pipeline flowmeter 160 can fill the bypass pipe, thereby effectively improving the accuracy of flow monitoring in the bypass pipe 150.

[0051] Referring to Figure 1 and Figure 2 , in some embodiments of the present invention, the control valve 170 is arranged on the bypass horizontal pipe section. Specifically, since the valve core of the control valve 170 usually relies on vertical movement to achieve flow regulation, when the control valve 170 is arranged on a vertically placed pipe section, problems such as lateral eccentric wear of the valve core are likely to occur, resulting in a decrease in the regulation accuracy and sealing performance. Therefore, in the embodiments of the present invention, by arranging the control valve 170 on the bypass horizontal pipe section of the bypass pipe 150, lateral eccentric wear is reduced, the sealing surfaces are evenly contacted, and the problem of incomplete closing caused by the valve core sagging due to its own weight is alleviated, effectively improving the regulation accuracy and sealing performance of the control valve.

[0052] Referring to Figure 1 and Figure 2 , in some embodiments of the present invention, the ecological flow discharge system based on the discharge pipe provided by the embodiments of the present invention further includes a discharge valve 140. Specifically, in the embodiments of the present invention, the discharge valve 140 is arranged on the discharge pipe 130, and the discharge valve is located downstream of the connection between the bypass pipe 150 and the discharge pipe 130, that is, after the water flow upstream of 120 enters the discharge pipe 130, it is first shunted at the connection between the bypass pipe 150 and the discharge pipe 130, and then flows to the discharge valve 140. Correspondingly, in the embodiments of the present invention, the working state of the discharge pipe 130 is controlled by the discharge valve 140. For example, when the discharge valve 140 is opened, the discharge pipe 130 is in a working state, and short-term large-flow sediment discharge or reservoir capacity emptying can be carried out through the discharge pipe 130.

[0053] In some embodiments of the present invention, the steps of arranging the bypass pipe include but are not limited to the following steps:

[0054] Calculate the expected pipeline data according to the approved ecological flow parameters and the preset head parameters. Among them, the expected pipeline data includes pipeline inner diameter data and expected length data.

[0055] Calculate the first length data of the bypass vertical pipe section according to the pipeline inner diameter data through a preset hydraulic algorithm.

[0056] Determine the second length data of the bypass horizontal pipe section according to the first length data and the expected length data.

[0057] Set the bypass pipe according to the first length data, the second length data, and the pipe inner diameter data.

[0058] In this specific embodiment, the embodiments of the present invention first calculate the expected pipe data according to the verified ecological flow parameters and the preset water head parameters. Specifically, the expected pipe data in the embodiments of the present invention includes the pipe inner diameter data and the expected length data. Specifically, the pipe inner diameter data in the embodiments of the present invention refers to the minimum size of the inner diameter of the bypass pipe. In addition, the expected pipe data in the embodiments of the present invention refers to the expected length of the bypass pipe. Correspondingly, the preset water head parameters in the embodiments of the present invention include the minimum orifice acting water head, where in the case of submerged outflow, it is the water level difference between upstream and downstream, and in the case of free outflow, it is the difference between the upstream water level and the elevation of the outlet center, with the unit of meter (m). Exemplarily, when the verified ecological flow parameter Q = 0.02m 3 / s, set H1 = 1m, n6 = 0.013, ∑ζ = 1.2, x = 1; after calculation, D = 0.1m, and the length of the vertical pipe section is at least 1.5m to meet the ecological flow discharge requirements. The calculation process is as Figure 3 shown, and the calculation formula is as shown in the following formula (1):

[0059]

[0060] wherein, in the formula, H1 represents the minimum orifice acting water head, R T represents the comprehensive coefficient of head loss, L represents the pipe length, with the unit of meter (m), n6 represents the roughness coefficient, which can be determined according to SL655, R represents the hydraulic radius, with the unit of meter (m), D represents the pipe inner diameter, with the unit of meter (m), A represents the pipe cross-sectional area, with the unit of square meter (m 2 ), ζ represents the local head loss coefficient, x represents the outflow coefficient, taking 1.0 for free outflow and 0 for complete submersion.

[0061] Next, the embodiment of the present invention calculates the first length of the bypass vertical pipe section according to the pipeline inner diameter data through a preset hydraulics algorithm, determines the second length data of the bypass horizontal pipe section according to the first length data and the expected length data, and then sets the bypass pipe according to the first length data, the second length data, and the pipeline inner diameter data. Specifically, the embodiment of the present invention first analyzes the bypass vertical pipe section based on hydraulics to determine the corresponding pipeline length, so as to alleviate the problem that the unstable flow velocity has an adverse impact on the monitoring data. For example, the embodiment of the present invention determines that the first length data of the bypass vertical pipe section is ≥15D through a preset hydraulics algorithm, that is, the length of the bypass vertical pipe section is greater than or equal to 15 times the pipeline inner diameter, thereby improving the accuracy of the monitoring data. Next, the embodiment of the present invention determines the length of the bypass horizontal pipe section by subtracting the length of the bypass vertical pipe section from the total expected length (expected length data) of the calculated bypass pipe. Correspondingly, the embodiment of the present invention sets the bypass pipe according to the determined first length data of the bypass vertical pipe section, the second length data of the bypass horizontal pipe section, and the pipeline inner diameter data, so as to be able to alleviate the problem that inaccurate data monitoring is caused by unstable flow velocity while meeting the ecological flow discharge. In addition, the pipe diameter of the bypass pipe in the embodiment of the present invention is less than or equal to the pipe diameter of the discharge pipe.

[0062] In some embodiments of the present invention, the setting of the pipeline flowmeter includes but is not limited to the following steps:

[0063] Determine the expected installation position according to the first length data and the preset installation position parameters. Among them, the preset installation position parameters are determined through a preset hydraulics algorithm, and the preset installation position parameters include the upstream pipe section length parameter and the downstream pipe section length parameter.

[0064] Install the pipeline flowmeter according to the expected installation position.

[0065] In this specific example, in the embodiment of the present invention, the desired installation position is first determined according to the first length data and the preset installation position parameters, and then the pipeline flowmeter is installed according to the desired installation position. Specifically, in the embodiment of the present invention, the preset installation position parameters refer to the condition parameters required for the installation of the pipeline flowmeter, including the upstream pipe section parameters and the downstream pipe section parameters. Among them, the upstream pipe section parameters refer to the condition parameters required for the upstream pipe section at the installation position of the pipeline flowmeter, and the downstream pipe section parameters refer to the condition parameters required for the downstream pipe section at the installation position of the pipeline flowmeter. Correspondingly, in the embodiment of the present invention, the preset installation position parameters are determined by a preset hydraulics algorithm. For example, in order to make the water flow form a fully developed flow layer before entering the pipeline flowmeter to alleviate the interference of eddies, etc. on the pipeline flowmeter, in the embodiment of the present invention, the upstream pipeline length parameter is that the upstream straight pipe section ≥ 10D. At the same time, in order for the water flow to gradually return to the natural flow state after passing through the pipeline flowmeter and reduce the disturbance to the subsequent pipeline or equipment, in the embodiment of the present invention, the downstream pipeline length parameter is that the downstream straight pipe ≤ 5D. Correspondingly, in the embodiment of the present invention, the best installation position of the pipeline flowmeter on the bypass vertical pipe section, that is, the desired installation position, is determined according to the preset installation position and the length data of the bypass vertical pipe section, and then the pipeline flowmeter is installed at the desired installation position, effectively improving the monitoring accuracy and stability of the pipeline flowmeter.

[0066] The embodiment of the present invention provides an ecological flow discharge method based on a discharge pipe, which can effectively improve the safety of ecological flow discharge in a diversion-type hydropower station and improve the operability of ecological flow discharge. Refer to Figure 4 , the method of the embodiment of the present invention includes but is not limited to steps S210 to S220.

[0067] Specifically, the application process of applying the method of the embodiment of the present invention to the above-mentioned ecological flow discharge system based on a discharge pipe includes but is not limited to the following steps:

[0068] Step S210: Dynamically monitor the flow data through a pipeline flowmeter.

[0069] Step S220: Analyze the flow data to adjust the ecological flow discharge through a control valve.

[0070] During the operation of this specific embodiment, in the embodiments of the present invention, the flow rate data is first dynamically monitored by a pipeline flowmeter, and then analyzed based on the flow rate data to adjust the ecological flow discharge through a control valve. Specifically, in the embodiments of the present invention, the flow rate data refers to the water flow rate in the bypass pipe. Correspondingly, in the embodiments of the present invention, the pipeline flowmeter installed on the bypass pipe is used to monitor the water flow rate in the bypass pipeline in real time, and the monitored flow rate data is analyzed to determine whether the current flow rate discharged from the bypass pipe meets the required ecological flow rate. Then, by controlling and adjusting the control valve, the adjustment of the ecological flow discharge is realized. By forming a closed-loop control mode between the pipeline flowmeter and the control valve, the safety of the ecological flow discharge of the diversion-type hydropower station is effectively improved, and the operability of the ecological flow discharge is also improved.

[0071] In some embodiments of the present invention, the flow rate data is dynamically monitored by a pipeline flowmeter, including but not limited to the following steps:

[0072] The pipeline flow velocity data is dynamically collected by the pipeline flowmeter. Among them, the pipeline flow velocity data includes the water flow velocity data in the bypass pipe.

[0073] The flow rate data is calculated based on the pipeline flow velocity data and the pipeline inner diameter data.

[0074] In this specific embodiment, in the embodiments of the present invention, the pipeline flow velocity data is first dynamically collected by the pipeline flowmeter, and then the flow rate data is calculated based on the pipeline flow velocity data and the pipeline inner diameter data. Specifically, the pipeline flow velocity data in the embodiments of the present invention includes the water flow velocity data in the bypass pipe. Among them, in the embodiments of the present invention, the water flow velocity in the bypass pipe is collected in real time by the pipeline flowmeter. Correspondingly, in the embodiments of the present invention, based on the pipeline inner diameter data of the bypass pipe and the collected water flow velocity (pipeline flow velocity data), the flow rate data of the water flowing through the bypass is calculated through a preset flow rate algorithm, as shown in the following formula (2):

[0075]

[0076] Among them, in the formula, Q represents the discharge flow rate value, with the unit of cubic meters per second (m 3 / s), v represents the measured flow velocity value, that is, the pipeline flow velocity data, and d represents the pipeline inner diameter, with the unit of meter (m). Among them, in the embodiments of the present invention, for steel pipes, the pipeline inner diameter can be taken as its nominal diameter, and for plastic pipes, the nominal diameter minus twice the wall thickness is taken.

[0077] In some embodiments of the present invention, the flow rate data is analyzed to adjust the ecological flow discharge through a control valve, including but not limited to the following steps:

[0078] The expected opening value is obtained by analyzing the flow rate data and the expected ecological flow rate threshold.

[0079] Adjust the opening of the control valve according to the desired opening value to perform ecological flow discharge regulation.

[0080] In this specific embodiment, the embodiment of the present invention first analyzes the flow data and the desired ecological flow threshold to obtain the desired opening value, and then adjusts the opening of the control valve according to the desired opening value to perform ecological flow discharge regulation. Specifically, the desired ecological flow threshold in the embodiment of the present invention refers to the minimum flow value required to be discharged, and this discharged flow can meet the ecological flow demand. Correspondingly, the embodiment of the present invention compares the flow data in the bypass pipeline (the ecological flow discharged from the bypass pipe) with the desired ecological flow threshold to determine whether the currently discharged flow is greater than the desired ecological flow threshold, that is, whether it meets the ecological flow demand, and then determines the desired opening value of the control valve. For example, when it is determined that the flow data is less than the desired ecological flow threshold, it means that the currently discharged flow from the bypass pipe is too small, and at this time, the opening of the control valve needs to be increased to increase the discharged flow. Therefore, the embodiment of the present invention analyzes and calculates the desired opening value of the control valve based on the currently real-time monitored flow data, and adjusts the opening of the control valve to the desired opening, so as to achieve accurate and stable discharge of ecological flow.

[0081] It is easy to understand that the embodiment of the present invention discharges ecological flow through a newly connected bypass pipe of the discharge pipe, and the control valve of the bypass pipe controls the flow rate. The pipeline flowmeter monitors the discharged flow online. It is possible to deploy this ecological flow discharge system without changing the existing river-blocking facilities, which not only meets the requirements of ecological environment protection, but also does not affect the operation safety of the river-blocking facilities. At the same time, it is easy to operate, effectively alleviates the problems existing in the discharge of ecological flow by the existing discharge pipes, and is convenient for quantitative monitoring of the discharged flow, with the characteristics of good safety, strong operability, and high accuracy.

[0082] The embodiments described in the embodiments of the present application are for more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation to the technical solutions provided by the embodiments of the present application. Those skilled in the art know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0083] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation to the embodiments of the present application, and may include more or fewer steps than shown in the figures, or combine certain steps, or different steps.

[0084] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0085] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in systems and devices can be implemented as software, firmware, hardware, and their appropriate combinations.

[0086] As used in the description of the present application and the above-mentioned drawings, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0087] It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally means that the associated objects before and after are in an "or" relationship. "At least one (one) of the following" or its similar expression means any combination of these items, including any combination of single items (ones) or plural items (ones). For example, at least one (one) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0088] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above-mentioned unit division is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms.

[0089] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or may be distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0090] The preferred embodiments of the embodiments of the present application have been described above with reference to the accompanying drawings. However, this does not limit the scope of the rights of the embodiments of the present application. Any modifications, equivalent replacements, and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall fall within the scope of the rights of the embodiments of the present application.

Claims

1. An ecological flow discharge system based on a discharge pipe, characterized in that, Applied to a diversion-type hydropower station, the system includes: A discharge pipe, the inlet end of which is connected to a river-blocking facility; A bypass pipe, the inlet end of which is connected to the discharge pipe, and the bypass pipe is used for discharging ecological flow; A pipeline flowmeter, which is arranged on the bypass pipe, and the pipeline flowmeter is used for monitoring the flow data of the bypass pipe; A control valve, which is arranged on the bypass pipe, and the control valve is used for adjusting the ecological flow according to the flow data.

2. The system according to claim 1, wherein The bypass pipe includes: A bypass vertical pipe section, the inlet end of which is connected above the pipeline of the discharge pipe, and the bypass vertical pipe section is used for diverting the water flow in the discharge pipe into the bypass pipe; A bypass horizontal pipe section, the inlet end of which is connected to the outlet end of the bypass vertical pipe section, and the bypass horizontal pipe section is used for discharging ecological flow.

3. The system according to claim 2, wherein The pipeline flowmeter is arranged on the bypass vertical pipe section.

4. The system according to claim 2, wherein The control valve is arranged on the bypass horizontal pipe section.

5. The system according to claim 1, wherein The system further includes: A discharge valve, which is arranged on the discharge pipe and is located downstream of the connection between the bypass pipe and the discharge pipe, and the discharge valve is used for controlling the working state of the discharge pipe.

6. The system according to claim 2, wherein The setting steps of the bypass pipe include: Calculating the expected pipeline data according to the approved ecological flow parameters and the preset water head parameters; wherein, the expected pipeline data includes pipeline inner diameter data and expected length data; Calculating the first length data of the bypass vertical pipe section according to the pipeline inner diameter data through a preset hydraulic algorithm; Determining the second length data of the bypass horizontal pipe section according to the first length data and the expected length data; Setting the bypass pipe according to the first length data, the second length data and the pipeline inner diameter data.

7. The system according to claim 6, wherein The setting steps of the pipeline flowmeter include: Determining the expected installation position according to the first length data and the preset installation position parameters; wherein, the preset installation position parameters are determined by the preset hydraulic algorithm, and the preset installation position parameters include upstream pipe section length parameters and downstream pipe section length parameters; Installing the pipeline flowmeter according to the expected installation position.

8. An ecological flow discharge method based on a discharge pipe, characterized in that, Applied to the system of claim 1, the method includes the following steps: Dynamically monitoring the flow data through the pipeline flowmeter; Analyzing the flow data to adjust the discharge of ecological flow through the control valve.

9. The method according to claim 8, characterized in that, The dynamically monitoring the flow data through the pipeline flowmeter includes: Dynamically collecting pipeline flow velocity data through the pipeline flowmeter; wherein, the pipeline flow velocity data includes the water flow velocity data in the bypass pipe; Calculating the flow data according to the pipeline flow velocity data and the pipeline inner diameter data.

10. The method according to claim 8, wherein The analyzing the flow data to adjust the discharge of ecological flow through the control valve includes: Analyzing according to the flow data and the expected ecological flow threshold to obtain the expected opening value; Adjusting the opening of the control valve according to the expected opening value to adjust the discharge of ecological flow.

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