Variable-flow energy-saving control method, system, equipment and medium for technical water supply system

Abstract

The invention discloses a variable-flow energy-saving control method, system, equipment and medium for a technical water supply system. The variable-flow energy-saving control method comprises the following steps: controlling a system adopting self-flow water supply or self-flow pressure-reduced water supply; a technical water system adopting a water pump to supply water is controlled; according to the method, the system, the equipment and the medium, the technical water supply system of the hydropower station can be automatically and accurately controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of energy-saving control of hydro-generator sets, and relates to a variable flow energy-saving control method, system, equipment and medium for a technical water supply system. Background Art

[0002] The technical water supply system is the main auxiliary equipment of the hydro-turbine generator set. Its function is to provide cooling water required for the operation of the upper guide, lower guide, water guide, thrust, main transformer, air compressor and other coolers of the hydro-turbine generator set, and to provide lubricating water required for the operation of the main shaft seal and other systems. According to the different water heads of the power station, the commonly used water supply methods mainly include gravity water supply, gravity pressure reduction water supply, water pump water supply and top cover water supply. In order to adapt to the seasonal changes in river water quality, the technical water supply circulation mode of the hydro-turbine generator set is divided into open circulation and closed circulation. The automation control level of the technical water supply system of the traditional hydropower station is low, the system parameter control is relatively extensive, and the adjustment method is simple. This causes large fluctuations in pressure and flow during the operation of the system. And the problem of system energy saving and improving generator efficiency is basically not considered. The parameters of the technical water system are also affected by factors such as the head of the unit, which further reduces the working efficiency of the system and even causes problems such as generator condensation. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a variable flow energy-saving control method, system, equipment and medium for a technical water supply system, which can automatically and accurately control the technical water supply system of a hydropower station.

[0004] To achieve the above object, the present invention discloses a variable flow energy-saving control method for a technical water supply system, comprising:

[0005] Control systems using gravity water supply or gravity reduced pressure water supply;

[0006] Control of technical water systems supplied by pumps;

[0007] Control the cold / hot air temperature of the air cooler which can be manually intervened.

[0008] Furthermore, the control of the system using gravity water supply or gravity reduced pressure water supply includes the control of the technical water pipe pressure, the control of the air cooler pressure and the control of the thrust bearing cooler pressure.

[0009] Furthermore, the control process of the technical jellyfish tube pressure is:

[0010] Measure the pressure information of the technical jellyfish tube, generate a first control signal through closed-loop control according to the pressure information of the technical jellyfish tube, and control the technical jellyfish tube pressure regulating valve I according to the first control signal to adjust the pressure of the technical jellyfish tube.

[0011] Furthermore, the control process of the air cooler pressure is:

[0012] Measure the flow information of the air cooler outlet main pipe, and calculate the cooling water demand Q of the air cooler according to the flow information of the air cooler outlet main pipe and the cooling water demand Q of the air cooler. 空 , generate a second control signal, and control the air cooler pressure regulating valve I according to the second control signal to adjust the pressure of the air cooler, thereby controlling the flow of the air cooler.

[0013] Furthermore, the cooling water demand of the air cooler is:

[0014]

[0015] Among them, C is the specific heat of water, △t is the difference between the inlet and outlet water temperatures of the air cooler, and △N is the electromagnetic loss power of the generator.

[0016] Furthermore, the control process of the thrust bearing cooler pressure is as follows:

[0017] Measure the flow information of the thrust bearing cooler outlet main pipe, generate a third control signal according to the flow information of the thrust bearing cooler outlet main pipe, and adjust the thrust bearing cooler pressure regulating valve I according to the third control signal to control the pressure of the thrust bearing cooler main pipe, thereby controlling the flow of the thrust bearing cooler.

[0018] The invention discloses a variable flow energy-saving control system for a technical water supply system, comprising:

[0019] A first control module is used to control a system using gravity water supply or gravity reduced pressure water supply;

[0020] A second control module is used to control a technical water system that uses a water pump to supply water;

[0021] The third control module is used to control the cold / hot air temperature of the air cooler which can be manually intervened.

[0022] Furthermore, the control of the system using gravity water supply or gravity reduced pressure water supply includes the control of the technical water pipe pressure, the control of the air cooler pressure and the control of the thrust bearing cooler pressure.

[0023] The present invention discloses a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the variable flow energy-saving control method of the technical water supply system are implemented.

[0024] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the variable flow energy-saving control method of the technical water supply system are implemented.

[0025] The present invention has the following beneficial effects:

[0026] The variable flow energy-saving control method, system, equipment and medium of the technical water supply system described in the present invention adopt a combined control method during specific operation to realize automatic and accurate control of the technical water supply system of the hydropower station. Specifically, the system using gravity water supply or gravity reduced-pressure water supply is controlled; the technical water system using a water pump for water supply is controlled; the cold / hot air temperature of the air cooler which can be manually intervened is controlled, so as to overcome the head and drainage losses caused by the constant pressure and constant flow operation mode of the traditional technical water system, and at the same time take into account the requirements of power stations with different technical water supply and water intake methods and the open circulation and closed circulation working modes of technical water, optimize and meet the requirements of each cooler of the unit for the technical water flow under different working conditions, reduce the water consumption of the unit for power generation, improve the efficiency of the generator, reduce the plant power consumption rate, and improve the condensation problem of the unit air cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 A logical diagram of the jellyfish pipe pressure control for a system technology that uses gravity water supply or gravity reduced pressure water supply;

[0029] Figure 2 A logical diagram for controlling the pressure (flow) of an air cooler in a system using gravity water supply or gravity reduced pressure water supply;

[0030] Figure 3 A logic diagram for controlling the pressure (flow) of the thrust bearing cooler of a system using gravity water supply or gravity reduced pressure water supply;

[0031] Figure 4 A logical diagram for controlling a technical water system using a water pump to supply water;

[0032] Figure 5 A logical diagram for the control of the technical water system for gravity water intake or gravity reduced pressure water intake;

[0033] Figure 6 Schematic diagram of the logic of the technical water system control that supplies water to the pumps.

[0034] Among them, 1A indicates that the controller controls the technical water pipe pressure according to the set pressure, 2A indicates the analog quantity quality judgment link, 1B indicates the relationship between active power and air cooler flow demand, 2B indicates air cooler flow prediction control, 3B indicates air cooler cold / hot air temperature control, 4B indicates air cooler pressure limit, 1C indicates the relationship between active power and thrust bearing cooler flow demand, 2C indicates thrust bearing cooler flow prediction control, 3C indicates the relationship between working water head and unit efficiency, 4C indicates thrust bearing cooler pressure limit, 1 is the upper guide bearing cooler, 2 is the air-cooled cooler, 3 is the thrust bearing cooler, 4 is the lower guide bearing cooler, 5 is the water-guide bearing cooler, 6 is the technical water pipe pressure regulating valve, 7 is the air cooler pressure regulating valve, 8 is the thrust bearing cooler pressure regulating valve, 9 is the pressure reducing water source, 10 is the technical water cooler, 11 is the technical water variable frequency water pump, and 12 is the water pump water intake or closed-loop water source. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0038] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0039] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0040] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0043] Embodiment 1

[0044] The variable flow energy-saving control method for the technical water supply system described in the present invention includes controlling a system using gravity water supply or gravity reduced-pressure water supply, controlling a technical water system using a water pump to supply water, and controlling the cold / hot air temperature of an air cooler that can be manually intervened.

[0045] Specifically, the control of the system using gravity water supply or gravity reduced pressure water supply includes the control of technical water pipe pressure, the control of air cooler pressure (flow) and the control of thrust bearing cooler pressure (flow).

[0046] refer to Figure 1 , Figure 5 and Figure 6 The control process of the jellyfish tube pressure is as follows:

[0047] The pressure information of the technical jellyfish tube is measured, and a first control signal is generated through a closed-loop control method according to the pressure information of the technical jellyfish tube, and the pressure regulating valve I of the technical jellyfish tube is controlled according to the first control signal to adjust the pressure of the technical jellyfish tube. It should be noted that the pressure information of the technical jellyfish tube is measured by a technical jellyfish tube pressure transmitter.

[0048] refer to Figure 2 , Figure 5 and Figure 6 , the control process of air cooler pressure is:

[0049] Measure the flow information of the air cooler outlet main pipe, and calculate the cooling water demand Q of the air cooler according to the flow information of the air cooler outlet main pipe and the cooling water demand Q of the air cooler. 空 , generate a second control signal, and control the air cooler pressure regulating valve I according to the second control signal to adjust the pressure of the air cooler, thereby controlling the flow of the air cooler, wherein the flow information of the air cooler outlet main pipe is measured by the air cooler inlet flow transmitter.

[0050] The cooling water demand of the air cooler is:

[0051]

[0052] Wherein, C is the specific heat of water, C = 4.187 × 103 J / (kg·K); △t is the difference between the inlet and outlet water temperatures of the air cooler, ranging from 2 to 4 K; △N is the electromagnetic loss power of the generator (kW).

[0053] refer to Figure 3 , Figure 5 and Figure 6 , the control process of the thrust bearing cooler pressure (flow) is:

[0054] Measure the flow information of the thrust bearing cooler outlet main pipe, generate a third control signal according to the flow information of the thrust bearing cooler outlet main pipe, and adjust the thrust bearing cooler pressure regulating valve I according to the third control signal to control the pressure of the thrust bearing cooler main pipe, thereby controlling the flow of the thrust bearing cooler, wherein the flow information of the thrust bearing cooler outlet main pipe is measured by the thrust bearing cooler inlet flow transmitter.

[0055] It should be noted that for a Francis turbine generator set, the axial water thrust F acting on the runner is W for:

[0056]

[0057] Where K is the coefficient to be determined, D1 is the nominal diameter of the impeller, n is the impeller speed under specific working conditions, r / min, Q is the impeller flow rate under specific working conditions, m 3 / s, H is the working water head under specific working conditions, m.

[0058] The control of the technical water system using a water pump for water supply includes limiting the pressure of the technical water main pipe and controlling the pressure (flow) of the air cooler. It should be noted that according to the general design principle of water consumption allocation of the technical water system, the generator air cooler accounts for about 70% of the total technical water supply of a single machine. The water consumption of the technical water cooler is usually designed with a safety factor of 1.5 times the minimum water consumption, and the air cooler is operated at the optimal efficiency as the control principle, and the working pressure requirements of the remaining branch coolers are guaranteed by limiting the module 4D.

[0059] Embodiment 2

[0060] The variable flow rate energy-saving control system for the water supply system described in the present invention comprises:

[0061] A first control module is used to control a system using gravity water supply or gravity reduced pressure water supply;

[0062] A second control module is used to control a technical water system that uses a water pump to supply water;

[0063] The third control module is used to control the cold / hot air temperature of the air cooler which can be manually intervened.

[0064] Furthermore, the control of the system using gravity water supply or gravity reduced pressure water supply includes the control of the technical water pipe pressure, the control of the air cooler pressure and the control of the thrust bearing cooler pressure.

[0065] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0066] Embodiment 3

[0067] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the variable flow energy-saving control method of the technical water supply system are implemented, for example, including: controlling a system using gravity water supply or gravity pressure-reduced water supply; controlling a technical water system using a water pump for water supply; and controlling the cold / hot air temperature of an air cooler that can be manually intervened. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, which may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0068] Embodiment 4

[0069] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the variable flow energy-saving control method of the technical water supply system are implemented, for example, including: controlling a system using gravity water supply or gravity pressure-reduced water supply; controlling a technical water system using a water pump to supply water; and controlling the cold / hot air temperature of an air cooler that can be manually intervened. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0070] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0071] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0072] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0074] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0075] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A variable flow energy-saving control method for a technical water supply system, characterized in that: include: Control systems using gravity water supply or gravity reduced pressure water supply; Control of technical water systems supplied by pumps; Control the cold / hot air temperature of the air cooler which can be manually intervened.

2. The variable flow energy-saving control method for a technical water supply system according to claim 1 is characterized in that: Control of a system using gravity water supply or gravity reduced pressure water supply includes control of technical water pipe pressure, control of air cooler pressure and control of thrust bearing cooler pressure.

3. The variable flow rate energy-saving control method for a technical water supply system according to claim 1 is characterized in that: The control process of technical jellyfish tube pressure is: Measure the pressure information of the technical jellyfish tube, generate a first control signal through closed-loop control according to the pressure information of the technical jellyfish tube, and control the technical jellyfish tube pressure regulating valve I according to the first control signal to adjust the pressure of the technical jellyfish tube.

4. The variable flow rate energy-saving control method for a technical water supply system according to claim 1 is characterized in that: The control process of air cooler pressure is: Measure the flow information of the air cooler outlet main pipe, and calculate the cooling water demand Q of the air cooler according to the flow information of the air cooler outlet main pipe and the cooling water demand Q of the air cooler. 空 , generate a second control signal, and control the air cooler pressure regulating valve I according to the second control signal to adjust the pressure of the air cooler, thereby controlling the flow of the air cooler.

5. The variable flow rate energy-saving control method for a technical water supply system according to claim 4 is characterized in that: The cooling water demand of the air cooler is: Among them, C is the specific heat of water, △t is the difference between the inlet and outlet water temperatures of the air cooler, and △N is the electromagnetic loss power of the generator.

6. The variable flow energy-saving control method for a technical water supply system according to claim 1 is characterized in that: The control process of the thrust bearing cooler pressure is as follows: Measure the flow information of the thrust bearing cooler outlet main pipe, generate a third control signal according to the flow information of the thrust bearing cooler outlet main pipe, and adjust the thrust bearing cooler pressure regulating valve I according to the third control signal to control the pressure of the thrust bearing cooler main pipe, thereby controlling the flow of the thrust bearing cooler.

7. A variable flow energy-saving control system for a technical water supply system, characterized in that: include: A first control module is used to control a system using gravity water supply or gravity reduced pressure water supply; A second control module is used to control a technical water system that uses a water pump to supply water; The third control module is used to control the cold / hot air temperature of the air cooler which can be manually intervened.

8. The variable flow energy-saving control system for technical water supply system according to claim 7 is characterized in that: Control of a system using gravity water supply or gravity reduced pressure water supply includes control of technical water pipe pressure, control of air cooler pressure and control of thrust bearing cooler pressure.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the variable flow energy-saving control method for the water supply system as described in any one of claims 1-6 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the steps of the variable flow energy-saving control method for the water supply system as described in any one of claims 1 to 6 are implemented.

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