Thermal power plant water circulation ammonification automatic adjusting method and related equipment

Abstract

The invention provides a thermal power plant water circulation ammonification automatic adjusting method and related equipment, and relates to the technical field of thermal power plant ammonification, and the method comprises the following steps: after the frequency of a condensation water ammonification metering pump reaches a threshold value, if the specific conductivity in a condensation water loop does not meet the system target specific conductivity requirement; the distributed control unit obtains the current pH value of the condensation water loop and adjusts the stroke of the condensation water ammonification metering pump based on the current pH value of the condensation water loop and the current frequency of the condensation water ammonification metering pump. After the frequency of the condensation water ammonification metering pump reaches the threshold value, the stroke is adjusted, and when the condensation water ammonification metering pump reaches the operation limit operation frequency, the single-time dosage is changed by changing the stroke, so that the specific conductivity of a condensation water system meets the working condition requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia addition in thermal power plants, and in particular to an automatic regulating method for adding ammonia to water circulation in thermal power plants and related equipment. Background Art

[0002] In thermal power generation systems, in order to adjust the pH value of the water vapor system to inhibit corrosion and protect thermal equipment, it is necessary to increase the pH value by adding ammonia to the water.

[0003] In order to add ammonia to the feed water, it is necessary to use a condensate ammonia metering pump to strictly control the amount of ammonia added to the water. However, the operating frequency of the ammonia metering pump is relatively low. When the condensate ammonia metering pump operates at the limit frequency, the specific conductivity cannot meet the working conditions. At this time, the condensate ammonia metering pump cannot be adjusted further. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a method for automatically adjusting the addition of ammonia to water circulation in a thermal power plant and related equipment, in order to solve at least part of the above problems.

[0005] In a first aspect, an embodiment of the present invention provides a method for automatically regulating the addition of ammonia to a water cycle in a thermal power plant, characterized in that the method is applied to an automatic regulation system for adding ammonia to a water cycle in a thermal power plant, wherein the automatic regulation system for adding ammonia to a water cycle in a thermal power plant is used to control a condensate ammonia metering pump, the automatic regulation system for adding ammonia to a water cycle in a thermal power plant comprises a programmable logic controller and a distributed control unit, and the condensate ammonia metering pump is used to inject ammonia water of a preset concentration into the condensate water circuit. The method comprises:

[0006] The programmable logic controller uses the product of the error between the specific conductivity of the condensate water circuit after the dosing point and the target specific conductivity and the condensate water flow rate as feedback to adjust the frequency of the condensate water ammonia dosing pump;

[0007] After the frequency of the condensate ammonia metering pump reaches the threshold, if the current specific conductivity of the condensate circuit does not meet the target specific conductivity;

[0008] The distributed control unit obtains and adjusts the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate water circuit and the current frequency of the condensate ammonia dosing pump.

[0009] When the stroke of the condensate ammonia metering pump changes, the plunger displacement changes, and thus the single dosing amount changes. Therefore, adjusting the stroke of the condensate ammonia metering pump adjusts the internal environment of the condensate circuit, and when the condensate ammonia metering pump reaches the operating limit frequency, the single dosing amount is changed by changing the stroke, so that the specific conductivity meets the working conditions.

[0010] In one possible manner, the threshold value includes: an upper frequency threshold value and a lower frequency threshold value;

[0011] In the step of obtaining and adjusting the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate water circuit and the current frequency of the condensate ammonia dosing pump by the distributed control unit, the distributed control unit performs the following operations in each stroke adjustment cycle:

[0012] If the current frequency of the condensate ammonia metering pump is greater than the frequency upper limit threshold, and the current pH value of the condensate circuit is less than the pH upper limit threshold, the stroke percentage of the condensate ammonia metering pump is increased;

[0013] If the current frequency of the condensate ammonia metering pump is less than the frequency upper limit threshold, and the current pH value of the condensate circuit is greater than the pH upper limit threshold, the stroke percentage of the condensate ammonia metering pump is reduced.

[0014] In one possible embodiment, the method further includes:

[0015] If the current stroke percentage of the condensate ammonia metering pump is higher than or equal to the stroke upper limit threshold, the distributed control unit is stopped from obtaining and adjusting the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump.

[0016] One possible approach is that if the current stroke percentage of the condensate ammonia metering pump is equal to or lower than the stroke lower limit threshold, the distributed control unit is stopped from obtaining and adjusting the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump.

[0017] One possible approach is that if the current frequency of the condensate ammonia adding metering pump is greater than the frequency upper limit threshold and the current pH value of the condensate water circuit is less than the pH lower limit threshold, then in the step of increasing the stroke of the condensate ammonia adding metering pump, the stroke of the condensate ammonia adding metering pump is increased by a first percentage in each stroke adjustment cycle.

[0018] One possible approach is that if the current frequency of the condensate ammonia adding metering pump is less than the frequency lower limit threshold, and the current pH value of the condensate circuit is greater than the pH upper limit threshold, then in the step of lowering the stroke of the condensate ammonia adding metering pump, the stroke of the condensate ammonia adding metering pump is lowered according to the second percentage in each stroke adjustment cycle.

[0019] One possible approach is that, in response to a stop instruction, the distributed control unit stops obtaining and adjusting the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump.

[0020] In a second aspect, the present application provides an automatic regulation system for adding ammonia to a water circulation in a thermal power plant, the automatic regulation system for adding ammonia to a water circulation in a thermal power plant is used to control a condensate water ammonia metering pump, the automatic regulation system for adding ammonia to a water circulation in a thermal power plant comprises: a programmable logic controller and a distributed control unit, the condensate water ammonia metering pump is used to inject ammonia water of a preset concentration into the condensate water circuit;

[0021] The programmable logic controller is configured to use the product of the error between the specific conductivity of the condensate water circuit after the dosing point and the target specific conductivity and the condensate water flow rate as feedback to adjust the frequency of the condensate water ammonia dosing pump;

[0022] After the frequency of the condensate ammonia metering pump reaches the threshold, if the current specific conductivity of the condensate circuit does not meet the target specific conductivity;

[0023] The distributed control unit is configured to obtain and adjust the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia dosing pump.

[0024] In a third aspect, the present application provides an electronic device, comprising:

[0025] at least one processor; and

[0026] at least one memory in communication with the processor, wherein:

[0027] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the method according to the first aspect.

[0028] In a fourth aspect, the present application provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method described in the first aspect.

[0029] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A structural diagram of a water circulation ammonia addition automatic regulation system for a thermal power plant provided by an embodiment of the present invention;

[0033] Figure 2 A flow chart of a method for automatically adjusting water circulation and ammonia addition in a thermal power plant provided by an embodiment of the present invention;

[0034] Figure 3 This is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In thermal power generation systems, in order to adjust the pH value of the water vapor system to inhibit corrosion and protect thermal equipment, it is necessary to increase the pH value by adding ammonia to the water.

[0037] In order to add ammonia to the feed water, it is necessary to use a condensate ammonia metering pump to strictly control the amount of ammonia added to the water. However, the operating frequency of the ammonia metering pump is relatively low. When the condensate ammonia metering pump operates at the limit frequency, the specific conductivity cannot meet the working conditions. At this time, the condensate ammonia metering pump cannot be adjusted further.

[0038] Based on this, an embodiment of the present invention provides an automatic adjustment method for adding ammonia to water circulation in a thermal power plant and related equipment, in order to solve the above problems.

[0039] To facilitate understanding of this embodiment, a method for automatic regulation of water circulation and ammonia addition in a thermal power plant disclosed in an embodiment of the present invention is first introduced in detail.

[0040] The present application provides a method for automatically regulating the addition of ammonia to water circulation in a thermal power plant. The method is applied to an automatic regulating system for the addition of ammonia to water circulation in a thermal power plant, which is used to control a condensate ammonia metering pump.

[0041] Reference Figure 1 In the embodiment provided in the present application, the automatic regulation system for adding ammonia to the water circulation of a thermal power plant includes a programmable logic controller and a distributed control unit, and the condensate ammonia metering pump is used to inject ammonia water of a preset concentration into the condensate circuit.

[0042] Reference Figure 2 In the embodiment provided in the present application, first: execute S10: the programmable logic controller uses the product of the error between the specific conductivity of the condensate water circuit after the dosing point and the target specific conductivity and the current condensate water flow rate as feedback to adjust the frequency of the condensate water ammonia metering pump.

[0043] Specifically, the conversion relationship between specific conductivity and pH value is as follows:

[0044] PH = A + lgDD;

[0045] PH—the target pH value of the liquid where ammonia is added;

[0046] DD—Specific conductivity of condensate circuit;

[0047] A—PH constant.

[0048] It should be noted that in the thermal power generation water-steam circulation system, specific conductivity (also called electrical conductivity) is used to indicate the ability of water to conduct electric current.

[0049] In this step, when the condensate ammonia metering pump drips ammonia into the condensate water circuit, it is regarded as dosing. The programmable logic controller uses the condensate flow rate as the gain and the error between the specific conductivity of the condensate water circuit after the dosing point and the target specific conductivity as the error. The feedback amount is generated and the frequency of the condensate ammonia metering pump is adjusted by PID regulation.

[0050] At this time, the frequency of the condensate ammonia metering pump gradually increases or decreases. When the frequency of the condensate ammonia metering pump reaches the threshold, if the current specific conductivity of the condensate circuit does not meet the target specific conductivity, the frequency of the condensate ammonia metering pump cannot be adjusted.

[0051] In this situation, start adjusting the stroke of the condensate ammonia metering pump.

[0052] Specifically, executing S20: the distributed control unit obtains and adjusts the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate water circuit and the current frequency of the condensate ammonia dosing pump.

[0053] Specifically, in this step, the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump are fed back to the distributed control unit, and the distributed control unit will adjust the stroke of the condensate ammonia metering pump based on the fed-back pH value and frequency.

[0054] In the embodiment provided in the present application, the condensate circuit is provided with an economizer. Specifically, in this step, the distributed control unit can obtain the pH value at the economizer inlet.

[0055] The core principle of a condensate ammonia metering pump is to change the effective volume of the pump chamber by directly controlling the physical displacement of the plunger (or diaphragm). The single dosage of the condensate ammonia metering pump corresponds to the volume of ammonia liquid discharged by a single movement of the plunger. This volume is determined by the effective cross-sectional area of ​​the pump chamber and the distance the plunger is displaced.

[0056] When the stroke of the condensate ammonia metering pump changes, the plunger displacement changes, and thus the single dosing amount changes. Therefore, adjusting the stroke of the condensate ammonia metering pump adjusts the internal environment of the condensate circuit, and when the condensate ammonia metering pump reaches the operating limit frequency, the single dosing amount is changed by changing the stroke, so that the specific conductivity meets the working conditions.

[0057] The following will explain the specific adjustment method of the stroke:

[0058] In the embodiment provided in the present application, the aforementioned limit thresholds include: an upper frequency threshold and a lower frequency threshold. The upper frequency threshold represents the upper limit of the optimal operating frequency of the condensate ammonia metering pump, and the lower frequency threshold represents the lower limit of the optimal operating frequency of the condensate ammonia metering pump.

[0059] Given that the specific conductivity control of the condensate ammonia metering pump is difficult and the specific conductivity control of the condensate water circuit has hysteresis, when it is predicted that the specific conductivity of the condensate water circuit cannot meet the operating requirements, the layer can be flushed in advance for adjustment.

[0060] Specifically, the upper limit of the optimal operating frequency of the condensate ammonia metering pump is lower than the upper limit of the operating frequency of the condensate ammonia metering pump, and the lower limit of the optimal operating frequency of the condensate ammonia metering pump is higher than the lower limit of the operating frequency of the condensate ammonia metering pump.

[0061] For example, assuming that the upper limit of the operating frequency of the condensate ammonia metering pump is 80 Hz and the lower limit of the operating frequency of the condensate ammonia metering pump is 0 Hz, the upper limit threshold of the frequency can be set to 60 Hz and the lower limit threshold of the frequency can be set to 20 Hz.

[0062] By adjusting the stroke in advance, the hysteresis of the specific conductance control of the condensate circuit can be reduced.

[0063] Specifically, in the embodiment provided in the present application, if the current frequency of the condensate ammonia metering pump is greater than the frequency upper limit threshold, and the current pH value of the condensate circuit is less than the pH upper limit threshold, this means that the pH value of the condensate circuit is too low, which means that the single drug injection amount of the condensate ammonia metering pump needs to be increased. Therefore, the stroke percentage of the condensate ammonia metering pump needs to be increased.

[0064] Here, the stroke percentage represents the ratio of the actual stroke length to the maximum stroke length of the pump, and the pH lower threshold represents the minimum pH value allowed in the condensate circuit, that is, the maximum acidity allowed in the condensate circuit.

[0065] As a preferred embodiment, in this situation, the stroke percentage of the condensate-adding ammonia metering pump is increased according to a first percentage in each stroke adjustment cycle.

[0066] In this example, the first percentage can be understood as the adjustment step of each stroke cycle. Exemplarily, each stroke adjustment cycle increases the stroke percentage of the condensate-adding-ammonia metering pump by 2%.

[0067] To further illustrate the example, a specific example is provided below:

[0068] Assuming that the frequency upper limit threshold is 40HZ, the pH upper limit threshold is 9.4, assuming that the pH value of the condensate water circuit after the drug point is 9.1, and the current frequency of the condensate water ammonia metering pump is 40Hz, then the stroke percentage of the condensate water ammonia metering pump is adjusted. Assuming that the current stroke percentage is 60%, the stroke percentage is adjusted from 60% to 62% in the current stroke adjustment cycle, and this operation is repeated in the next cycle. As the stroke increases, the amount of drug added each time gradually increases, the environment in the condensate gradually becomes alkaline, and the pH value of the condensate water circuit will gradually increase. When the pH value of the condensate water circuit reaches 9.4, the stroke of the condensate water ammonia metering pump is stopped.

[0069] In some examples, if the current frequency of the condensate ammonia metering pump is less than the frequency lower limit threshold, and the current pH value of the condensate circuit is greater than the pH upper limit threshold, it means that the condensate circuit is too alkaline. At this time, the single dosage of the condensate ammonia metering pump is reduced. Specifically, the stroke percentage of the condensate ammonia metering pump is lowered.

[0070] As a preferred embodiment, in this situation, the stroke percentage of the condensate-adding-ammonia metering pump is reduced according to the second percentage in each stroke adjustment cycle.

[0071] Similarly, the second percentage can be understood as the adjustment step of each stroke cycle. For example, each stroke adjustment cycle reduces the stroke percentage of the condensate-adding ammonia metering pump by 2%.

[0072] The second percentage is different from the first percentage in that the first percentage is an adjustment step for increasing the stroke percentage of the condensate ammonia dosing pump, while the second percentage is an adjustment step for decreasing the stroke percentage of the condensate ammonia dosing pump.

[0073] To further illustrate the example, a specific example is provided below:

[0074] Assuming that the frequency upper limit threshold is 10HZ, the pH lower limit threshold is 9.2, and the pH value of the condensate water circuit after the drug point is 9.3, and the current frequency of the condensate water ammonia metering pump is 10HZ, the stroke percentage of the condensate water ammonia metering pump is adjusted at this time. Assuming that the current stroke percentage is 60%, the stroke percentage is adjusted from 60% to 58% in the current stroke adjustment cycle, and this operation is repeated in the next cycle. Since the amount of drug added each time is reduced, the condensate water circuit will gradually become acidic, and the pH value of the condensate water circuit will gradually decrease. When the pH value of the condensate water circuit reaches 9.2, the stroke of the condensate water ammonia metering pump is stopped.

[0075] Through the above method, the stroke percentage of the condensate ammonia metering pump is adjusted with the help of the condensate ammonia metering pump. During the stroke percentage adjustment process, the frequency of the condensate ammonia metering pump will not change, and thus frequency oscillation will not occur.

[0076] In some situations, if the current stroke percentage of the condensate ammonia metering pump is higher than or equal to the stroke upper limit threshold, it means that the stroke of the condensate ammonia metering pump cannot be adjusted, and the above-mentioned distributed control unit is stopped to obtain and adjust the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump.

[0077] It should be noted that the stroke upper limit threshold represents the maximum value of the stroke percentage, which can be 80% for example. In this example, assuming that the stroke percentage of the condensate ammonia metering pump is greater than or equal to 80%, it means that the stroke percentage of the condensate ammonia metering pump can no longer be adjusted at this time.

[0078] In another scenario, if the current stroke percentage of the condensate ammonia metering pump is equal to or lower than the stroke lower limit threshold, the distributed control unit is stopped from obtaining and adjusting the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump.

[0079] It should be noted that the stroke lower limit threshold represents the minimum value of the stroke percentage, which can be 20% for example. In this example, assuming that the stroke percentage of the condensate ammonia metering pump is less than or equal to 20%, it means that the stroke percentage of the condensate ammonia metering pump can no longer be adjusted at this time.

[0080] Through the above method, the stroke of the condensate ammonia adding metering pump is prevented from being too large or too small, ensuring that the condensate ammonia adding metering pump moves within the allowable stroke range, thereby improving the service life of the condensate ammonia adding metering pump.

[0081] On the basis of the above-mentioned embodiment, it is assumed that the stop instruction is triggered, and the water circulation ammonia addition automatic regulation system of the thermal power plant responds to the stop instruction, stops the distributed control unit from obtaining and adjusting the stroke of the condensate ammonia addition metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia addition metering pump.

[0082] Based on the above embodiments, the present application provides an automatic regulating system for adding ammonia to the water circulation of a thermal power plant. The automatic regulating system for adding ammonia to the water circulation of a thermal power plant is used to control a condensate ammonia metering pump. The automatic regulating system for adding ammonia to the water circulation of a thermal power plant includes a programmable logic controller and a distributed control unit. The condensate ammonia metering pump is used to inject ammonia water of a preset concentration into the condensate water circuit.

[0083] Programmable logic controller: configured to use the product of the error between the specific conductivity of the condensate water circuit after the dosing point and the target specific conductivity and the condensate water flow rate as feedback to adjust the frequency of the condensate water ammonia dosing pump;

[0084] After the frequency of the condensate ammonia metering pump reaches the threshold, if the current specific conductivity of the condensate circuit does not meet the target specific conductivity;

[0085] The distributed control unit is configured to obtain and adjust the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump.

[0086] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0087] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0088] The flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of code, and the module, program segment or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, as well as the combination of boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0089] Figure 3 A block diagram is shown of an exemplary electronic device suitable for implementing exemplary embodiments of the present invention. Figure 3 The electronic device shown is only an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0090] like Figure 3 As shown, the electronic device is implemented as a general-purpose computing device. Components of the electronic device may include, but are not limited to, one or more processors 410, a memory 430, and a communication bus 440 connecting various system components (including the memory 430 and the processing unit 410).

[0091] Communication bus 440 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. Examples of such architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnection (PCI) bus.

[0092] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0093] Memory 430 may include computer-readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. Memory 430 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of various embodiments of the present invention.

[0094] A program / utility having a set (at least one) of program modules may be stored in memory 430. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules generally perform the functions and / or methods described in the embodiments of the present invention.

[0095] The processor 410 executes various functional applications and data processing by running the programs stored in the memory 430, such as implementing the embodiments of the present invention. Figure 1 The method provided by the illustrated embodiment.

[0096] An embodiment of the present invention provides a non-transitory computer-readable storage medium storing computer instructions, which enable the computer to execute the embodiment of the present invention. Figure 1 The method provided by the illustrated embodiment.

[0097] The above-mentioned computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM) or flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or device.

[0098] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0099] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0100] The computer program code for performing the operations of the embodiments of the present invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect via the Internet).

[0101] The foregoing description describes specific embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0102] In the description of the embodiments of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In the embodiments of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in the embodiments of the present invention and the features of different embodiments or examples, unless they are contradictory.

[0103] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0104] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred implementation of the embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the invention pertain.

[0105] 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 the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0106] It should be noted that the terminals involved in the embodiments of the present invention may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.

[0107] In the several embodiments provided in the embodiments of the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection of the devices or units through some interfaces, which may be electrical, mechanical or other forms.

[0108] In addition, the functional units in various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or hardware plus software functional units.

[0109] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to perform some of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, and other media that can store program code.

[0110] The above description is only a preferred embodiment of the embodiment of the present invention and is not intended to limit the embodiment of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiment of the present invention should be included in the scope of protection of the embodiment of the present invention.

Claims

1. A method for automatically adjusting the water circulation and ammonia addition in a thermal power plant, characterized in that: The method is applied to a thermal power plant water circulation ammonia addition automatic regulation system, the thermal power plant water circulation ammonia addition automatic regulation system is used to control a condensate water ammonia addition metering pump, the thermal power plant water circulation ammonia addition automatic regulation system includes a programmable logic controller and a distributed control unit, the condensate water ammonia addition metering pump is used to inject ammonia water of a preset concentration into the condensate water circuit, and the method includes: The programmable logic controller uses the product of the error between the condensate water circuit specific conductivity after the dosing point and the target specific conductivity and the condensate water flow rate as feedback to adjust the frequency of the condensate water ammonia dosing pump; After the frequency of the condensate ammonia metering pump reaches the threshold, if the current specific conductivity of the condensate circuit does not meet the target specific conductivity; The distributed control unit obtains and adjusts the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate water circuit and the current frequency of the condensate ammonia dosing pump.

2. The method according to claim 1, characterized in that The threshold values ​​include: an upper frequency threshold and a lower frequency threshold; In the step of obtaining and adjusting the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate water circuit and the current frequency of the condensate ammonia dosing pump by the distributed control unit, the distributed control unit performs the following operations in each stroke adjustment cycle: If the current frequency of the condensate ammonia metering pump is greater than the frequency upper limit threshold, and the current pH value of the condensate circuit is less than the pH upper limit threshold, the stroke of the condensate ammonia metering pump is increased; and If the current frequency of the condensate ammonia metering pump is less than the frequency lower limit threshold, and the current pH value of the condensate circuit is greater than the pH upper limit threshold, the stroke of the condensate ammonia metering pump is reduced.

3. The method according to claim 2, characterized in that The method further comprises: If the current stroke of the condensate ammonia metering pump is higher than or equal to the stroke upper limit threshold, the step of the distributed control unit adjusting the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump is stopped.

4. The method according to claim 2, characterized in that If the current stroke of the condensate ammonia metering pump is equal to or lower than the stroke lower limit threshold, the step of the distributed control unit adjusting the stroke of the condensate ammonia metering pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia metering pump is stopped.

5. The method according to claim 2, characterized in that If the current frequency of the condensate ammonia adding metering pump is greater than the frequency upper limit threshold and the current pH value of the condensate water circuit is less than the pH lower limit threshold, in the step of increasing the stroke of the condensate ammonia adding metering pump, the stroke of the condensate ammonia adding metering pump is increased by a first percentage in each stroke adjustment cycle.

6. The method according to claim 2, characterized in that If the current frequency of the condensate ammonia adding metering pump is less than the frequency upper limit threshold, and the current pH value of the condensate water circuit is greater than the pH upper limit threshold, in the step of lowering the stroke of the condensate ammonia adding metering pump, the stroke of the condensate ammonia adding metering pump is lowered according to the second percentage in each stroke adjustment cycle.

7. The method according to claims 1 to 6, characterized in that The step of stopping the distributed control unit from adjusting the stroke of the condensate ammonia adding metering pump based on the current pH value of the condensate and the current frequency of the condensate ammonia adding metering pump in response to the stop instruction.

8. An automatic regulating system for adding ammonia to water circulation in a thermal power plant, characterized in that: The thermal power plant water circulation ammonia addition automatic regulation system is used to control the condensate water ammonia addition metering pump, and the thermal power plant water circulation ammonia addition automatic regulation system includes: a programmable logic controller and a distributed control unit, and the condensate water ammonia addition metering pump is used to inject ammonia water of a preset concentration into the condensate water circuit; The programmable logic controller is configured to use the product of the error between the condensate water circuit specific conductivity after the dosing point and the target specific conductivity and the condensate water flow rate as feedback to adjust the frequency of the condensate water ammonia dosing pump; After the frequency of the condensate ammonia metering pump reaches the threshold, if the current specific conductivity of the condensate circuit does not meet the target specific conductivity; The distributed control unit is configured to obtain and adjust the stroke of the condensate ammonia dosing pump based on the current pH value of the condensate circuit and the current frequency of the condensate ammonia dosing pump.

9. An electronic device, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor, wherein: The memory stores program instructions that can be executed by the processor, and the processor can execute the method according to any one of claims 1 to 7 by calling the program instructions.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method according to any one of claims 1 to 7.

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