Method, system, equipment and medium for automatically adjusting liquid level of cooling tower pool of thermal power plant

Abstract

The invention discloses a method, a system, equipment and a medium for automatically adjusting the liquid level of a tower pool of a cooling tower of a thermal power plant. The method comprises the following steps: determining water loss of the cooling tower in different time periods according to operation data of the thermal power plant and the size of the cooling tower; the water inlet amount of the cooling tower is determined according to the water loss amount of the cooling tower in different time periods, the opening degree of a water inlet adjusting door in a cooling tower water supplementing system is adjusted according to the water inlet amount of the cooling tower, and the method, the system, the equipment and the medium can achieve automatic adjustment of the liquid level of a tower pool of the cooling tower.

Description

Technical Field

[0001] The invention belongs to the field of automatic control and relates to a method, system, equipment and medium for automatically adjusting the liquid level of a cooling tower pool of a thermal power plant. Background Art

[0002] Circulating cooling thermal power plants usually use hyperbolic cooling towers to provide cooling water of a certain temperature to the condenser to condense the exhaust steam of the low-pressure cylinder of the steam turbine, so that the steam turbine can operate safely and economically under a certain exhaust pressure. The cooling tower pool stores the cooled cooling water and transports it to the condenser through a circulating pump. There is a large amount of evaporation and wind loss during the operation of the cooling tower, and it is necessary to replenish water to the cooling tower pool in time.

[0003] At present, most thermal power plants lack automatic adjustment methods and control systems for cooling tower liquid levels. The cooling tower pool liquid level requires operators to manually adjust the opening of the circulating water make-up water pretreatment system inlet valve. The circulating water make-up water pretreatment system mainly adopts high-density tank and other processes. Manually adjusting the opening of the high-density tank inlet valve can easily cause problems such as unstable water quality of the high-density tank effluent and high operating costs of the power plant. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method, system, equipment and medium for automatically adjusting the liquid level of a cooling tower sump in a thermal power plant. The method, system, equipment and medium can realize automatic adjustment of the liquid level of a cooling tower sump.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] In one aspect, the present invention provides a method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant, comprising:

[0007] Determine the water loss of the cooling tower at different times based on the operating data of the thermal power plant and the size of the cooling tower;

[0008] The water inlet of the cooling tower is determined according to the water loss of the cooling tower in different time periods, and the opening of the water inlet regulating door in the cooling tower water replenishment system is adjusted according to the water inlet of the cooling tower.

[0009] The method for automatically adjusting the liquid level of a cooling tower sump of a thermal power plant according to the present invention is further improved in that:

[0010] Furthermore, the water loss Q of the cooling tower at different times is:

[0011] Q=Q z +Q f

[0012] Among them, Q z is the amount of evaporated water in the cooling tower, Q fIt is the windage loss of the cooling tower.

[0013] Furthermore, the windage loss Q of the cooling tower f is:

[0014] Q f = K f × Q x

[0015] wherein, K f is the windage coefficient, and Q x is the circulating water volume.

[0016] Furthermore, the evaporation water volume Q of the cooling tower z is:

[0017] Q z =

(K × P + T 1 / 10) + (K × P - 丨(T 2 - T 1 ) 丨 / 10

[0018] wherein, K f is the windage coefficient, T 1 is the ambient temperature, K z is the correction coefficient, P is the unit load, T 2 is the boundary temperature, and Q x is the circulating water volume.

[0019] Furthermore, it also includes:

[0020] Determine the ambient temperature T according to the unit ambient temperature meter or the weather forecast of the local meteorological bureau 1 ;

[0021] Determine the correction coefficient K according to the form of the cooling tower z ;

[0022] Determine the unit load P according to the power generation given by the State Grid;

[0023] Determine the boundary temperature T according to the geographical location and meteorological conditions of the power plant 2 .

[0024] In the second aspect of the present invention, the present invention provides an automatic regulation system for the liquid level of the cooling tower pool of a thermal power plant, including:

[0025] The first determination module is used to determine the loss water volume of the cooling tower at different time periods according to the operation data of the thermal power plant and the size of the cooling tower;

[0026] A second determination module, configured to determine the water inflow of the cooling tower according to the water loss of the cooling tower at different time periods, and adjust the opening degree of the water inlet regulating valve in the cooling tower water replenishment system according to the water inflow of the cooling tower.

[0027] A further improvement of the automatic cooling tower basin liquid level regulation system of the thermal power plant according to the present invention lies in:

[0028] Furthermore, the evaporation water volume Q of the cooling tower z is:

[0029] Q z =

(K × P + T 1 / 10) + (K × P - 丨(T 2 - T 1 ) 丨 / 10

[0030] Wherein, K f is the wind blow coefficient, T 1 is the ambient temperature, K z is the correction coefficient, P is the unit load, T 2 is the boundary temperature, and Q x is the circulating water volume.

[0031] Furthermore, it further includes:

[0032] A third determination module, configured to determine the ambient temperature T according to the unit environment thermometer or the weather forecast of the local meteorological bureau 1 ;

[0033] A fourth determination module, configured to determine the correction coefficient K according to the form of the cooling tower z ;

[0034] A fifth determination module, configured to determine the unit load P according to the power generation given by the State Grid;

[0035] A sixth determination module, configured to determine the boundary temperature T according to the geographical location and meteorological conditions of the power plant 2 .

[0036] In a third aspect of the present invention, there is provided a computer device, including 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 automatic cooling tower basin liquid level regulation method of the thermal power plant are implemented.

[0037] In a fourth aspect of the present invention, there is provided a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the automatic cooling tower basin liquid level regulation method are implemented.

[0038] The present invention has the following beneficial effects:

[0039] The method, system, equipment and medium for automatically adjusting the liquid level of the cooling tower sump of a thermal power plant described in the present invention determine the water loss of the cooling tower in different time periods according to the operating data of the thermal power plant and the size of the cooling tower during specific operation, and then determine the water inlet of the cooling tower according to the water loss of the cooling tower in different time periods, and adjust the opening of the water inlet regulating door in the cooling tower water replenishment system based on this, so as to realize automatic control of the liquid level of the cooling tower sump. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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:

[0041] Figure 1 is a flow chart of the method of the present invention;

[0042] Figure 2 It is a system structure diagram of the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Embodiment 1

[0052] refer to Figure 1 The method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant according to the present invention comprises the following steps:

[0053] 1) Determine the ambient temperature T according to the unit ambient thermometer or the weather forecast of the local meteorological bureau 1 ;

[0054] 2) Determine the correction factor K according to the type of cooling tower z ;

[0055] 3) Determine the unit load P according to the power generation given by the State Grid;

[0056] 4) Determine the boundary temperature T according to the geographical location and meteorological conditions of the power plant 2 ;

[0057] 5) Divide the daily ambient temperature T into several time periods according to the boundary temperature T 2 ; 1 ;

[0058] 6) Calculate the evaporation water volume Q of the cooling tower according to the ambient temperature T 1 , correction factor K z , unit load P and boundary temperature T 2 ; z ;

[0059] 7) Determine the circulating water volume Q x .

[0060] In this embodiment, the evaporation water volume Q of the cooling tower z is:

[0061] Q z =

(K × P + T 1 / 10) + (K × P - 丨(T 2 - T 1 ) 丨 / 10

[0062] Determine the windage coefficient K according to the local meteorological conditions f ;

[0063] Calculate the windage loss water volume Q of the cooling tower according to the windage coefficient K f and the circulating water volume Q x ; f is:

[0064] Q f = K f × Q x

[0065] Calculate the loss water volume Q of the cooling tower according to the evaporation water volume Q z and the windage loss Q f ;

[0066] Q = Q z + Q f

[0067] Set two boundary temperatures T according to the local meteorological conditions of the power plant 2 , and divide the daily ambient temperature T 1By boundary temperature T 2 Divided into two or three stages, according to the average ambient temperature T of each stage 1 Calculate the amount of evaporated water at each stage;

[0068] Determine the upper limit H of the tower pool liquid level according to the tower pool volume 1 And the lower limit H 2 ;

[0069] According to the cooling tower water loss Q calculated at each stage of the day, the incoming water volume is distributed to determine the inlet flow of the circulating water make-up water pretreatment system;

[0070] According to the size of the cooling tower pool, calculate the liquid level changes when the cooling tower pool water replenishment flow is greater than the cooling tower loss and less than the cooling tower loss;

[0071] By automatically controlling the opening of the water inlet valve on the water inlet pipe in the cooling tower water supply system, the liquid level in the cooling tower pool is ensured not to exceed the upper limit H 1 , not less than the lower limit H 2 .

[0072] It should be noted that the present invention calculates and predicts the water loss and make-up water flow of the cooling tower based on the foundation and operation data of the thermal power plant, and then distributes the cooling tower make-up water flow to realize automatic regulation of the cooling tower pool liquid level, while ensuring the stability of the water inlet flow of the cooling tower make-up water treatment system, avoiding problems such as pool overflow caused by excessive water inlet flow, which is beneficial to the automated operation of the circulating water make-up water treatment system of the thermal power plant, and ensuring the safe and economical operation of the circulating water make-up water treatment system of the thermal power plant.

[0073] The present invention calculates the evaporation water volume of the cooling tower in each time period and the change of the cooling tower pool liquid level, reasonably distributes the calculated cooling tower loss water volume to each time period, and controls the replenishment water volume by controlling the water inlet regulating gate of the circulating water replenishment pretreatment system through the control system.

[0074] Embodiment 2

[0075] refer to Figure 2 The automatic liquid level regulating system for cooling tower pool of thermal power plant of the present invention comprises:

[0076] The first determination module is used to determine the water loss of the cooling tower in different time periods according to the operation data of the thermal power plant and the size of the cooling tower;

[0077] The second determination module is used to determine the water inlet of the cooling tower according to the water loss of the cooling tower in different time periods, and adjust the opening of the water inlet regulating door in the cooling tower water replenishment system according to the water inlet of the cooling tower.

[0078] As an embodiment of the present invention, the water loss Q of the cooling tower at different time periods is:

[0079] Q = Q z +Q f

[0080] wherein, Q z is the evaporation water volume of the cooling tower, and Q f is the drift loss of the cooling tower.

[0081] As an embodiment of the present invention, the drift loss Q f of the cooling tower is:

[0082] Q f = K f × Q x

[0083] wherein, K f is the drift coefficient, and Q x is the circulating water volume.

[0084] As an embodiment of the present invention, the evaporation water volume Q z of the cooling tower is:

[0085] Q z =

(K × P + T 1 / 10) + (K × P - 丨(T 2 - T 1 ) 丨 / 10

[0086] wherein, K f is the drift coefficient, T 1 is the ambient temperature, K z is the correction coefficient, P is the unit load, T 2 is the boundary temperature, and Q x is the circulating water volume.

[0087] As an embodiment of the present invention, it further includes:

[0088] A third determination module, configured to determine the ambient temperature T 1 according to the unit ambient temperature meter or the weather forecast of the local meteorological bureau;

[0089] A fourth determination module, configured to determine the correction coefficient K z according to the form of the cooling tower;

[0090] A fifth determination module, configured to determine the unit load P according to the power generation amount given by the State Grid;

[0091] A sixth determination module, configured to determine the boundary temperature T 2 according to the geographical location and meteorological conditions of the power plant.

[0092] 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.

[0093] Embodiment 3

[0094] 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 method for automatically adjusting the liquid level of the cooling tower pool of a thermal power plant are implemented, for example, including: determining the water loss of the cooling tower in different periods according to the operating data of the thermal power plant and the size of the cooling tower; determining the water intake of the cooling tower according to the water loss of the cooling tower in different periods, and adjusting the opening of the water intake regulating door in the cooling tower water supply system according to the water intake of the cooling tower. Determine the ambient temperature T according to the unit ambient thermometer or the weather forecast of the local meteorological bureau 1 ; Determine the correction factor K according to the cooling tower type z ; Determine the unit load P according to the power generation given by the State Grid; Determine the boundary temperature T according to the geographical location and meteorological conditions of the power plant 2 . 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, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure 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.

[0095] Embodiment 4

[0096] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the method for automatically adjusting the liquid level of the cooling tower pool of a thermal power plant are implemented. For example, the method includes: determining the water loss of the cooling tower in different periods according to the operating data of the thermal power plant and the size of the cooling tower; determining the water intake of the cooling tower according to the water loss of the cooling tower in different periods, and adjusting the opening of the water intake regulating door in the cooling tower water supply system according to the water intake of the cooling tower. Determine the ambient temperature T according to the unit ambient thermometer or the weather forecast of the local meteorological bureau 1 ; Determine the correction factor K according to the cooling tower typez ; Determine the unit load P according to the power generation given by the State Grid; Determine the boundary temperature T according to the geographical location and meteorological conditions of the power plant 2 Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1A step that specifies a function in one or more boxes.

[0101] 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.

[0102] 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.

[0103] 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 method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant, characterized in that: include: Determine the water loss of the cooling tower at different times based on the operating data of the thermal power plant and the size of the cooling tower; The water inlet of the cooling tower is determined according to the water loss of the cooling tower in different time periods, and the opening of the water inlet regulating door in the cooling tower water replenishment system is adjusted according to the water inlet of the cooling tower.

2. The method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant according to claim 1, characterized in that: The water loss Q of the cooling tower at different times is: Q=Q z +Q f Among them, Q z is the amount of evaporated water in the cooling tower, Q f It is the wind loss of cooling tower.

3. The method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant according to claim 2, characterized in that: The wind loss Q of the cooling tower f for: Q f =K f ×Q x Among them, K f is the wind blowing coefficient, Q x The circulating water volume.

4. The method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant according to claim 1, characterized in that: Evaporation water volume of cooling tower Q z for: Q z = 【(K × P + T1 / 10) + (K × P - 丨(T2 - T1)丨 / 10】× Q x Among them, K f is the wind blowing coefficient, T1 is the ambient temperature, K z is the correction coefficient, P is the unit load, T2 is the boundary temperature, Q x The circulating water volume.

5. The method for automatically adjusting the liquid level of a cooling tower pool in a thermal power plant according to claim 1, characterized in that: Also includes: Determine the ambient temperature T1 according to the unit ambient thermometer or the weather forecast of the local meteorological bureau; Determine the correction factor K according to the cooling tower type z ; Determine the unit load P based on the power generation given by the national grid; The boundary temperature T2 is determined according to the geographical location and meteorological conditions of the power plant.

6. An automatic liquid level adjustment system for a cooling tower pool in a thermal power plant, characterized in that: include: The first determination module is used to determine the water loss of the cooling tower in different time periods according to the operation data of the thermal power plant and the size of the cooling tower; The second determination module is used to determine the water inlet of the cooling tower according to the water loss of the cooling tower in different time periods, and adjust the opening of the water inlet regulating door in the cooling tower water replenishment system according to the water inlet of the cooling tower.

7. The automatic liquid level adjustment system for cooling tower pool of thermal power plant according to claim 6, characterized in that: Evaporation water volume of cooling tower Q z for: Q z = [(K × P + T1 / 10) + (K × P - |(T2 - T1)| / 10)] × Q x Among them, K f is the wind blowing coefficient, T1 is the ambient temperature, K z is the correction coefficient, P is the unit load, T2 is the boundary temperature, Q x The circulating water volume.

8. The automatic liquid level adjustment system for cooling tower pool of thermal power plant according to claim 7, characterized in that: Also includes: The third determination module is used to determine the ambient temperature T1 according to the unit ambient thermometer or the weather forecast of the local meteorological bureau; The fourth determination module is used to determine the correction factor K according to the cooling tower type z ; A fifth determination module is used to determine the unit load P according to the power generation provided by the national grid; The sixth determination module is used to determine the boundary temperature T2 according to the geographical location and meteorological conditions of the power plant.

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 method for automatically adjusting the liquid level of the cooling tower sump of a thermal power plant as described in any one of claims 1 to 5 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 method for automatically adjusting the liquid level of the cooling tower sump of a thermal power plant as described in any one of claims 1 to 5 are implemented.

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