A method and device for controlling the amount of desuperheating water

Abstract

The application provides a desuperheating water quantity control method and device, and relates to the technical field of automatic control. The method comprises the following steps: calculating the difference between the main steam temperature calculation value and the main steam temperature design value, and determining the desuperheating water quantity control strategy according to the difference; monitoring the primary desuperheating water quantity and the secondary desuperheating water quantity in the process of controlling the desuperheating water quantity according to the desuperheating water quantity control strategy; if it is determined that the primary desuperheating water quantity and the secondary desuperheating water quantity both reach the respective maximum values or the primary desuperheating water quantity and the secondary desuperheating water quantity both reach the respective minimum values, corresponding prompt messages are generated, and the air preheater thermal calculation is performed. The device executes the above method. The desuperheating water quantity control method and device provided in the embodiment of the application can not only quickly and accurately realize the desuperheating water quantity control, but also terminate the invalid iteration calculation in advance through the prompt message generation mode.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology, specifically to a method and device for controlling the amount of desuperheated water. Background Technology

[0002] The amount of desuperheating water required in thermal calculations is uncertain. Taking the SG-400 / 140-50145 boiler with two-stage desuperheating water as an example, in order to control the amount of desuperheating water, existing technologies typically start by setting a large desuperheating water value. If the calculated main steam temperature is insufficient, the given desuperheating water value is gradually reduced in small increments at a rate of 0.01 kg / s until the calculation error meets the requirements. However, the above method is too time-consuming and may not even meet actual production needs. Summary of the Invention

[0003] To address the problems in the prior art, embodiments of the present invention provide a method and apparatus for controlling the desuperheating water volume, which can at least partially solve the problems existing in the prior art.

[0004] On the one hand, the present invention proposes a method for controlling the amount of desuperheating water, comprising:

[0005] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0006] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0007] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0008] The step of determining the desuperheating water volume control strategy based on the difference includes:

[0009] If it is determined that the difference is greater than the first preset temperature threshold and the first-stage cooling water volume is less than the maximum value of the first-stage cooling water volume, then the first average value of the first-stage cooling water volume and the maximum value of the first-stage cooling water volume is calculated.

[0010] The first average value is used as the first desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the first desuperheating water volume update value, as well as subsequent steps.

[0011] The step of determining the desuperheating water volume control strategy based on the difference further includes:

[0012] If it is determined that the difference is greater than the first preset temperature threshold, and the first-stage cooling water volume is equal to the maximum value of the first-stage cooling water volume, then the second-stage cooling water volume is compared with the maximum value of the second-stage cooling water volume.

[0013] If it is determined that the secondary cooling water volume is less than the maximum value of the secondary cooling water volume, then calculate the second average value of the secondary cooling water volume and the maximum value of the secondary cooling water volume;

[0014] The second average value is used as the second desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the second desuperheating water volume update value, as well as subsequent steps.

[0015] The desuperheating water volume control method further includes:

[0016] If it is determined that the secondary cooling water volume is equal to the maximum value of the secondary cooling water volume, a first prompt message is generated indicating that the cooling water volume cannot be further adjusted due to high temperature.

[0017] The desuperheating water volume control method further includes:

[0018] If it is determined that the first cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the first preset percentage, then the first cooling water volume update value is directly updated to the first-level cooling water volume maximum value.

[0019] If it is determined that the second cooling water volume update value reaches the product of the maximum secondary cooling water volume and the first preset percentage, then the second cooling water volume update value is directly updated to the maximum secondary cooling water volume.

[0020] The step of determining the desuperheating water volume control strategy based on the difference includes:

[0021] If it is determined that the difference is less than the second preset temperature threshold and the secondary cooling water volume is greater than the minimum secondary cooling water volume, then the third average value of the secondary cooling water volume and the minimum secondary cooling water volume is calculated.

[0022] The third average value is used as the third desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the third desuperheating water volume update value, as well as subsequent steps.

[0023] The step of determining the desuperheating water volume control strategy based on the difference further includes:

[0024] If it is determined that the difference is less than the second preset temperature threshold, and the secondary cooling water volume is equal to the minimum secondary cooling water volume, then the primary cooling water volume is compared with the minimum primary cooling water volume.

[0025] If it is determined that the first-stage desuperheating water volume is greater than the minimum first-stage desuperheating water volume, then calculate the fourth average value of the first-stage desuperheating water volume and the minimum first-stage desuperheating water volume;

[0026] The fourth average value is used as the fourth desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the fourth desuperheating water volume update value, as well as subsequent steps.

[0027] The desuperheating water volume control method further includes:

[0028] If it is determined that the first-stage cooling water volume is equal to the minimum value of the first-stage cooling water volume, a second prompt message is generated indicating that the cooling water volume cannot be further adjusted due to the low temperature.

[0029] The desuperheating water volume control method further includes:

[0030] If it is determined that the third cooling water volume update value reaches the product of the maximum value of the secondary cooling water volume and the second preset percentage, then the third cooling water volume update value is directly updated to the minimum value of the secondary cooling water volume.

[0031] If it is determined that the fourth cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the second preset percentage, then the fourth cooling water volume update value is directly updated to the first-level cooling water volume minimum value.

[0032] On one hand, the present invention proposes a desuperheating water volume control device, comprising:

[0033] The determining unit is used to calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and to determine the desuperheating water volume control strategy based on the difference;

[0034] The monitoring unit is used to monitor the primary cooling water volume and the secondary cooling water volume during the process of controlling the cooling water volume according to the cooling water volume control strategy.

[0035] The generation unit is used to generate a corresponding prompt message and perform air preheater thermal calculations if it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values.

[0036] In another aspect, embodiments of the present invention provide 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, it implements the following method:

[0037] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0038] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0039] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0040] This invention provides a computer-readable storage medium, comprising:

[0041] The computer-readable storage medium stores a computer program that, when executed by a processor, implements the following method:

[0042] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0043] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0044] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0045] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the following method:

[0046] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0047] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0048] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0049] The desuperheating water volume control method and apparatus provided in this invention calculate the difference between the calculated value and the designed value of the main steam temperature, and determine the desuperheating water volume control strategy based on the difference. During the process of controlling the desuperheating water volume according to the desuperheating water volume control strategy, the primary and secondary desuperheating water volumes are monitored. If it is determined that both the primary and secondary desuperheating water volumes have reached their respective maximum values, or both have reached their respective minimum values, a corresponding prompt message is generated, and air preheater thermodynamic calculations are performed. This not only enables rapid and accurate desuperheating water volume control but also terminates invalid iterative calculations in advance by generating prompt messages. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0051] Figure 1 This is a schematic flowchart of a desuperheating water volume control method provided in an embodiment of the present invention.

[0052] Figure 2 This is a schematic diagram of the boiler body related to the desuperheating water volume control method provided in the embodiments of the present invention.

[0053] Figure 3 This is a flowchart illustrating a desuperheating water volume control method provided in another embodiment of the present invention.

[0054] Figure 4 This is a schematic diagram of the structure of a desuperheating water volume control device provided in an embodiment of the present invention.

[0055] Figure 5 This is a schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0057] Figure 1 This is a schematic flowchart of a desuperheating water volume control method provided in an embodiment of the present invention, as shown below. Figure 1As shown, the desuperheating water volume control method provided in this embodiment of the invention includes:

[0058] Step S1: Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference.

[0059] Step S2: During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, monitor the primary desuperheating water volume and the secondary desuperheating water volume.

[0060] Step S3: If it is determined that the primary desuperheating water flow rate and the secondary desuperheating water flow rate have both reached their respective maximum values, or the primary desuperheating water flow rate and the secondary desuperheating water flow rate have both reached their respective minimum values, then a corresponding prompt message is generated, and the air preheater thermal calculation is performed.

[0061] Before describing the desuperheating water volume control method provided in the embodiments of the present invention, as follows: Figure 2 As shown, the relevant content of this method will first be explained in conjunction with the boiler body structure:

[0062] Front screen correspondence Figure 2 The large screen overheater in the middle, the corresponding rear screen Figure 2 The location of the rear screen overheater, and other components, as shown in the image. Figure 2 As shown.

[0063] The boiler has a maximum evaporation capacity of 420 t / h (117 kg / s). The first-stage desuperheating water is set at the inlet of the front screen for coarse adjustment of the superheated steam temperature, while the second-stage desuperheating water is located between the rear screen and the convection superheater for fine adjustment. Due to the influence of pipe diameter and boiler thermal efficiency, the first-stage desuperheating water flow rate is generally limited to within 5% of the main steam flow rate, and the second-stage desuperheating water flow rate is limited to within 2% of the main steam flow rate. That is, the maximum value of the first-stage desuperheating water flow rate is 5.6 kg / s, and the maximum value of the second-stage desuperheating water flow rate is 2.3 kg / s. During the spray desuperheating process, there are countless combinations of the first and second-stage desuperheating water flow rates. For example, the actual desuperheating water injection rate may need to be 1.3 kg / s, which could be at the first stage, the second stage, or a little of both stages. There are countless combinations, all of which can achieve the desired effect. How to allocate and control the calculation process presents certain difficulties.

[0064] Since the desuperheating water volume verification is performed on the main steam temperature, the calculation process needs to be placed after the thermal calculation of the high-temperature superheater.

[0065] Considering that the control objective of the desuperheating water is the main steam temperature, reverse information transmission is required during manual control: if the main steam temperature is high, the water injection volume is increased; conversely, the water injection volume is decreased. Based on the change in steam temperature after water injection, further adjustments are made according to the principle of "increase for high, decrease for low," deciding whether to continue increasing or decreasing the injection volume. The required amount of desuperheating water cannot be predicted during thermodynamic calculations, so an iterative process of "assumption followed by verification" is necessary. The main steps are as follows:

[0066] 1) In the later stage of furnace heat transfer calculation, after the heat distribution of the front screen is completed, the initial values ​​of the main steam temperature and the first and second stage desuperheating water volume are given according to the empirical values. For example, the initial main steam temperature is 400℃, the first stage desuperheating water volume is 2kg / s, and the second stage desuperheating water volume is 0kg / s.

[0067] 2) Using the main steam temperature as the criterion for checking the desuperheating water volume: After the heat transfer calculation of the final stage convective superheater, the required desuperheating water volume can be calculated based on the over-temperature or under-temperature of the main steam temperature and rated parameters, or the desuperheating water volume can be adjusted first using the binary method according to the principle of "add for high and subtract for low".

[0068] 3) Adjust the distribution of desuperheating water according to the principle of "first coarse adjustment, then fine adjustment". First adjust the first-level desuperheating water volume, and then adjust the second-level desuperheating water volume, up to its limit and down to zero, and return to the furnace heating surface to recalculate the heat transfer. Continue until the error is within the allowable range.

[0069] The complete implementation of two-stage cooling water control function is to completely mimic the human operation of cooling water volume, and update the cooling water volume according to the idea that "the cooling water volume is doubled when the temperature is high, and halved when the temperature is low, and the cooling water volume is adjusted from low to high first", while solving the problem of "not being able to adjust".

[0070] In step S1 above, the device calculates the difference between the calculated main steam temperature and the designed main steam temperature, and determines the desuperheating water flow control strategy based on the difference. The device can be a computer or similar equipment that executes this method. The acquisition, storage, use, and processing of data in this application's technical solution all comply with relevant regulations. Figure 3 As shown, the step of determining the desuperheating water volume control strategy based on the difference includes:

[0071] If it is determined that the difference is greater than a first preset temperature threshold, and the first-stage cooling water volume is less than the maximum first-stage cooling water volume, then the first average value of the first-stage cooling water volume and the maximum first-stage cooling water volume is calculated; the first-stage cooling water volume corresponds to Figure 3 The front screen cooling water volume can be set independently, with the first preset temperature threshold set to +5℃ according to actual conditions. The maximum cooling water volume can also be set independently, with a maximum value of 5.6 kg / s.

[0072] The first average value is used as the first desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the first desuperheating water volume update value, followed by subsequent steps. (Refer to...) Figure 3 Specifically, it can perform steps such as front screen thermal calculation and rear screen thermal calculation until it is executed again to determine whether the main steam temperature meets the requirements, and then perform the corresponding steps based on the result of whether the requirements are met.

[0073] The step of determining the desuperheating water volume control strategy based on the difference further includes:

[0074] If it is determined that the difference is greater than the first preset temperature threshold, and the primary cooling water volume is equal to the maximum value of the primary cooling water volume, then the secondary cooling water volume is compared with the maximum value of the secondary cooling water volume; the secondary cooling water volume corresponds to Figure 3 The desuperheating water flow rate of the high-temperature superheater. The maximum value of the secondary desuperheating water flow rate can be set independently according to the actual situation, and can be selected as 2.3 kg / s.

[0075] If it is determined that the secondary cooling water volume is less than the maximum value of the secondary cooling water volume, then calculate the second average value of the secondary cooling water volume and the maximum value of the secondary cooling water volume;

[0076] The second average value is used as the second desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the second desuperheating water volume update value, followed by subsequent steps. (Refer to...) Figure 3 Specifically, it can perform steps such as thermal calculation of the high-temperature superheater and thermal calculation of other heating surfaces at all levels, until it is determined again whether the main steam temperature meets the requirements, and then perform the corresponding steps based on the result of whether the requirements are met.

[0077] The desuperheating water volume control method also includes:

[0078] If it is determined that the secondary cooling water volume is equal to the maximum value of the secondary cooling water volume, a first prompt message is generated indicating that the cooling water volume cannot be further adjusted due to high temperature. Figure 3 The temperature is high but cannot be adjusted. In existing technologies, if the temperature does not meet the requirements, such as when parameters cannot be adjusted, the cooling water volume verification calculation will form an infinite loop. A common solution is to set a maximum number of loops, but if this maximum number of loops is set too low, it cannot be determined whether it will become ineffective after that number of loops; if it is set too high, it will run idly for many loops, resulting in low efficiency and illogical behavior. This method eliminates the need for unnecessary calculations through the first prompt message.

[0079] The step of determining the desuperheating water volume control strategy based on the difference includes:

[0080] If it is determined that the difference is less than the second preset temperature threshold and the secondary cooling water volume is greater than the minimum secondary cooling water volume, then the third average value of the secondary cooling water volume and the minimum secondary cooling water volume is calculated; the second preset temperature threshold can be set independently according to the actual situation, and can be selected as -5℃, and the minimum secondary cooling water volume can be set independently according to the actual situation, and can be selected as 0.

[0081] The third average value is used as the third desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the third desuperheating water volume update value, followed by subsequent steps. (Refer to...) Figure 3 Specifically, it can perform steps such as thermal calculation of the high-temperature superheater and thermal calculation of other heating surfaces at all levels, until it is determined again whether the main steam temperature meets the requirements, and then perform the corresponding steps based on the result of whether the requirements are met.

[0082] The step of determining the desuperheating water volume control strategy based on the difference further includes:

[0083] If it is determined that the difference is less than the second preset temperature threshold, and the secondary cooling water volume is equal to the minimum secondary cooling water volume, then the primary cooling water volume is compared with the minimum primary cooling water volume; the minimum primary cooling water volume can be set independently according to the actual situation and can be selected as 0.

[0084] If it is determined that the first-stage desuperheating water volume is greater than the minimum first-stage desuperheating water volume, then calculate the fourth average value of the first-stage desuperheating water volume and the minimum first-stage desuperheating water volume;

[0085] The fourth average value is used as the fourth desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the fourth desuperheating water volume update value, followed by subsequent steps. (Refer to...) Figure 3 Specifically, it can perform steps such as front screen thermal calculation and rear screen thermal calculation until it is executed again to determine whether the main steam temperature meets the requirements, and then perform the corresponding steps based on the result of whether the requirements are met.

[0086] The desuperheating water volume control method also includes:

[0087] If it is determined that the first-stage cooling water volume is equal to the minimum value of the first-stage cooling water volume, a second prompt message is generated indicating that the cooling water volume cannot be further adjusted due to low temperature. Figure 3 The temperature is low but cannot be adjusted. In existing technologies, if the temperature does not meet the requirements, such as when parameters cannot be adjusted, the cooling water volume verification calculation will form an infinite loop. A common solution is to set a maximum number of loops, but if this maximum number of loops is set too low, it cannot be determined whether it will become ineffective after that number of loops; if it is set too high, it will run idly for many loops, resulting in low efficiency and illogical behavior. This method eliminates the need for redundant calculations through the second prompt message.

[0088] In step S2 above, while controlling the desuperheating water volume according to the desuperheating water volume control strategy, the device monitors the primary desuperheating water volume and the secondary desuperheating water volume, that is, it obtains real-time data of the primary desuperheating water volume and the secondary desuperheating water volume.

[0089] In step S3 above, if the device determines that both the primary and secondary desuperheating water flows have reached their respective maximum values, or both have reached their respective minimum values, then it generates a corresponding prompt message and performs air preheater thermal calculations. The primary and secondary desuperheating water flows reaching their respective maximum values ​​correspond to... Figure 3 If the temperature is too high to adjust, a first warning message will be generated indicating that the cooling water volume cannot be further adjusted due to the high temperature.

[0090] Both the primary and secondary desuperheating water flows have reached their respective minimum values, corresponding to... Figure 3 If the temperature is low but cannot be adjusted, a second prompt message will be generated indicating that the cooling water volume cannot be further adjusted due to the low temperature.

[0091] The desuperheating water volume control method also includes:

[0092] If it is determined that the first cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the first preset percentage, then the first cooling water volume update value is directly updated to the first-level cooling water volume maximum value.

[0093] If it is determined that the updated value of the second cooling water volume reaches the product of the maximum value of the secondary cooling water volume and the first preset percentage, then the updated value of the second cooling water volume is directly updated to the maximum value of the secondary cooling water volume. The first preset percentage can be a preset value close to 1, such as 0.995. The main purpose of this step is to prevent the final cooling water volume from undergoing repeated and ineffective iterations between 0.995 and 1, thus eliminating the need for further unnecessary calculations.

[0094] The desuperheating water volume control method also includes:

[0095] If it is determined that the third cooling water volume update value reaches the product of the maximum value of the secondary cooling water volume and the second preset percentage, then the third cooling water volume update value is directly updated to the minimum value of the secondary cooling water volume.

[0096] If the fourth cooling water volume update value is determined to be the product of the first-level cooling water volume maximum value and the second preset percentage, then the fourth cooling water volume update value is directly updated to the first-level cooling water volume minimum value. The second preset percentage can be a preset value close to 0, such as 0.005. The main purpose of this step is to prevent the final cooling water volume from undergoing repeated and ineffective iterations between 0 and 0.005, thus eliminating the need for further redundant calculations.

[0097] The desuperheating water volume control method provided in this invention calculates the difference between the calculated value and the designed value of the main steam temperature, and determines the desuperheating water volume control strategy based on the difference. During the process of controlling the desuperheating water volume according to the desuperheating water volume control strategy, the primary and secondary desuperheating water volumes are monitored. If it is determined that both the primary and secondary desuperheating water volumes have reached their respective maximum values, or both have reached their respective minimum values, a corresponding prompt message is generated, and air preheater thermal calculations are performed. This method not only enables rapid and accurate desuperheating water volume control but also terminates invalid iterative calculations in advance by generating prompt messages.

[0098] Further, determining the desuperheating water volume control strategy based on the difference includes:

[0099] If it is determined that the difference is greater than the first preset temperature threshold and the first-stage cooling water volume is less than the maximum value of the first-stage cooling water volume, then the first average value of the first-stage cooling water volume and the maximum value of the first-stage cooling water volume is calculated; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0100] The first average value is used as the first desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the first desuperheating water volume update value, as well as subsequent steps. This can be referred to the above embodiments for explanation, and will not be repeated here.

[0101] Furthermore, the step of determining the desuperheating water volume control strategy based on the difference also includes:

[0102] If it is determined that the difference is greater than the first preset temperature threshold, and the first-stage cooling water volume is equal to the maximum value of the first-stage cooling water volume, then the second-stage cooling water volume is compared with the maximum value of the second-stage cooling water volume; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0103] If it is determined that the secondary cooling water volume is less than the maximum value of the secondary cooling water volume, then the second average value of the secondary cooling water volume and the maximum value of the secondary cooling water volume is calculated; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0104] The second average value is used as the second desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the second desuperheating water volume update value, as well as subsequent steps. This can be referred to the above embodiment for explanation, and will not be repeated here.

[0105] Furthermore, the method for controlling the desuperheating water volume also includes:

[0106] If it is determined that the secondary cooling water volume is equal to the maximum value of the secondary cooling water volume, a first prompt message is generated indicating that the cooling water volume cannot be further adjusted due to high temperature. This can be referred to the above embodiment for further explanation, and will not be repeated here.

[0107] Furthermore, the method for controlling the desuperheating water volume also includes:

[0108] If it is determined that the first cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the first preset percentage, then the first cooling water volume update value is directly updated to the first-level cooling water volume maximum value; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0109] If it is determined that the updated value of the second cooling water volume reaches the product of the maximum value of the secondary cooling water volume and the first preset percentage, then the updated value of the second cooling water volume is directly updated to the maximum value of the secondary cooling water volume. This can be referred to the above embodiment for further explanation, and will not be repeated here.

[0110] Further, determining the desuperheating water volume control strategy based on the difference includes:

[0111] If it is determined that the difference is less than the second preset temperature threshold and the secondary cooling water volume is greater than the minimum secondary cooling water volume, then the third average value of the secondary cooling water volume and the minimum secondary cooling water volume is calculated; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0112] The third average value is used as the third desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the third desuperheating water volume update value, as well as subsequent steps. This can be referred to the above embodiment for explanation, and will not be repeated here.

[0113] Furthermore, the step of determining the desuperheating water volume control strategy based on the difference also includes:

[0114] If it is determined that the difference is less than the second preset temperature threshold, and the secondary cooling water volume is equal to the minimum secondary cooling water volume, then the primary cooling water volume is compared with the minimum primary cooling water volume; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0115] If it is determined that the first-stage desuperheating water volume is greater than the minimum first-stage desuperheating water volume, then the fourth average value of the first-stage desuperheating water volume and the minimum first-stage desuperheating water volume is calculated; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0116] The fourth average value is used as the fourth desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the fourth desuperheating water volume update value, as well as subsequent steps. This can be referred to the above embodiment for explanation, and will not be repeated here.

[0117] Furthermore, the desuperheating water volume control method also includes:

[0118] If it is determined that the first-stage cooling water volume is equal to the minimum first-stage cooling water volume, a second prompt message is generated indicating that the cooling water volume cannot be further adjusted due to low temperature. This can be referred to the above embodiment for further explanation, and will not be repeated here.

[0119] Furthermore, the desuperheating water volume control method also includes:

[0120] If it is determined that the third cooling water volume update value reaches the product of the maximum value of the secondary cooling water volume and the second preset percentage, then the third cooling water volume update value is directly updated to the minimum value of the secondary cooling water volume; this can be referred to the above embodiment for explanation, and will not be repeated here.

[0121] If it is determined that the fourth cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the second preset percentage, then the fourth cooling water volume update value is directly updated to the first-level cooling water volume minimum value. This can be referred to the above embodiment for explanation, and will not be repeated here.

[0122] Figure 4 This is a schematic diagram of the structure of a desuperheating water volume control device provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the desuperheating water volume control device provided in this embodiment of the invention includes a determining unit 401, a monitoring unit 402, and a generating unit 403, wherein:

[0123] The determining unit 401 is used to calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and to determine the desuperheating water flow control strategy based on the difference; the monitoring unit 402 is used to monitor the primary desuperheating water flow and the secondary desuperheating water flow during the process of controlling the desuperheating water flow according to the desuperheating water flow control strategy; the generating unit 403 is used to generate a corresponding prompt message and perform air preheater thermal calculation if it is determined that the primary desuperheating water flow and the secondary desuperheating water flow have both reached their respective maximum values, or the primary desuperheating water flow and the secondary desuperheating water flow have both reached their respective minimum values.

[0124] Specifically, the determining unit 401 in the device is used to calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and to determine the desuperheating water volume control strategy based on the difference; the monitoring unit 402 is used to monitor the primary desuperheating water volume and the secondary desuperheating water volume during the process of controlling the desuperheating water volume according to the desuperheating water volume control strategy; the generating unit 403 is used to generate a corresponding prompt message and perform air preheater thermal calculation if it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values.

[0125] The desuperheating water volume control device provided in this embodiment of the invention calculates the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determines the desuperheating water volume control strategy based on the difference. During the process of controlling the desuperheating water volume according to the desuperheating water volume control strategy, the device monitors the primary desuperheating water volume and the secondary desuperheating water volume. If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, a corresponding prompt message is generated, and air preheater thermal calculations are performed. This not only enables fast and accurate desuperheating water volume control, but also terminates invalid iterative calculations in advance by generating prompt messages.

[0126] Furthermore, the determining unit 401 is specifically used for:

[0127] If it is determined that the difference is greater than the first preset temperature threshold and the first-stage cooling water volume is less than the maximum value of the first-stage cooling water volume, then the first average value of the first-stage cooling water volume and the maximum value of the first-stage cooling water volume is calculated.

[0128] The first average value is used as the first desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the first desuperheating water volume update value, as well as subsequent steps.

[0129] Furthermore, the determining unit 401 is also specifically used for:

[0130] If it is determined that the difference is greater than the first preset temperature threshold, and the first-stage cooling water volume is equal to the maximum value of the first-stage cooling water volume, then the second-stage cooling water volume is compared with the maximum value of the second-stage cooling water volume.

[0131] If it is determined that the secondary cooling water volume is less than the maximum value of the secondary cooling water volume, then calculate the second average value of the secondary cooling water volume and the maximum value of the secondary cooling water volume;

[0132] The second average value is used as the second desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the second desuperheating water volume update value, as well as subsequent steps.

[0133] Furthermore, the desuperheating water volume control device is also used for:

[0134] If it is determined that the secondary cooling water volume is equal to the maximum value of the secondary cooling water volume, a first prompt message is generated indicating that the cooling water volume cannot be further adjusted due to high temperature.

[0135] Furthermore, the desuperheating water volume control device is also used for:

[0136] If it is determined that the first cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the first preset percentage, then the first cooling water volume update value is directly updated to the first-level cooling water volume maximum value.

[0137] If it is determined that the second cooling water volume update value reaches the product of the maximum secondary cooling water volume and the first preset percentage, then the second cooling water volume update value is directly updated to the maximum secondary cooling water volume.

[0138] Furthermore, the determining unit 401 is specifically used for:

[0139] If it is determined that the difference is less than the second preset temperature threshold and the secondary cooling water volume is greater than the minimum secondary cooling water volume, then the third average value of the secondary cooling water volume and the minimum secondary cooling water volume is calculated.

[0140] The third average value is used as the third desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the third desuperheating water volume update value, as well as subsequent steps.

[0141] Furthermore, the determining unit 401 is also specifically used for:

[0142] If it is determined that the difference is less than the second preset temperature threshold, and the secondary cooling water volume is equal to the minimum secondary cooling water volume, then the primary cooling water volume is compared with the minimum primary cooling water volume.

[0143] If it is determined that the first-stage desuperheating water volume is greater than the minimum first-stage desuperheating water volume, then calculate the fourth average value of the first-stage desuperheating water volume and the minimum first-stage desuperheating water volume;

[0144] The fourth average value is used as the fourth desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the fourth desuperheating water volume update value, as well as subsequent steps.

[0145] Furthermore, the desuperheating water volume control device is also used for:

[0146] If it is determined that the first-stage cooling water volume is equal to the minimum value of the first-stage cooling water volume, a second prompt message is generated indicating that the cooling water volume cannot be further adjusted due to the low temperature.

[0147] Furthermore, the desuperheating water volume control device is also used for:

[0148] If it is determined that the third cooling water volume update value reaches the product of the maximum value of the secondary cooling water volume and the second preset percentage, then the third cooling water volume update value is directly updated to the minimum value of the secondary cooling water volume.

[0149] If it is determined that the fourth cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the second preset percentage, then the fourth cooling water volume update value is directly updated to the first-level cooling water volume minimum value.

[0150] The embodiments of the present invention provide a desuperheating water volume control device that can be used to execute the processing flow of the above-described method embodiments. Its functions will not be repeated here, but can be referred to the detailed description of the above-described method embodiments.

[0151] Figure 5 This is a schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention, such as... Figure 5 As shown, the computer device includes: a memory 501, a processor 502, and a computer program stored in the memory 501 and executable on the processor 502. When the processor 502 executes the computer program, it implements the following method:

[0152] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0153] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0154] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0155] This embodiment discloses a computer program product, which includes a computer program that, when executed by a processor, implements the following method:

[0156] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0157] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0158] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0159] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the following method:

[0160] Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference;

[0161] During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored.

[0162] If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed.

[0163] Compared with existing technologies, the desuperheating water volume control method provided in this invention calculates the difference between the calculated main steam temperature and the designed main steam temperature, and determines a desuperheating water volume control strategy based on the difference. During the process of controlling the desuperheating water volume according to the desuperheating water volume control strategy, the primary and secondary desuperheating water volumes are monitored. If it is determined that both the primary and secondary desuperheating water volumes have reached their respective maximum values, or both have reached their respective minimum values, a corresponding prompt message is generated, and air preheater thermal calculations are performed. This not only enables rapid and accurate desuperheating water volume control but also terminates invalid iterative calculations in advance by generating prompt messages.

[0164] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0165] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0166] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0167] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0168] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0169] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the amount of desuperheating water, characterized in that, include: Calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and determine the desuperheating water flow control strategy based on the difference; During the process of controlling the desuperheating water volume according to the aforementioned desuperheating water volume control strategy, the primary desuperheating water volume and the secondary desuperheating water volume are monitored. If it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values, then a corresponding prompt message will be generated, and the air preheater thermal calculation will be performed. The step of determining the desuperheating water volume control strategy based on the difference includes: If it is determined that the difference is greater than the first preset temperature threshold and the first-stage cooling water volume is less than the maximum value of the first-stage cooling water volume, then the first average value of the first-stage cooling water volume and the maximum value of the first-stage cooling water volume is calculated. The first average value is used as the first desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the first desuperheating water volume update value. The step of determining the desuperheating water volume control strategy based on the difference further includes: If it is determined that the difference is greater than the first preset temperature threshold, and the first-stage cooling water volume is equal to the maximum value of the first-stage cooling water volume, then the second-stage cooling water volume is compared with the maximum value of the second-stage cooling water volume. If it is determined that the secondary cooling water volume is less than the maximum value of the secondary cooling water volume, then calculate the second average value of the secondary cooling water volume and the maximum value of the secondary cooling water volume; The second average value is used as the second desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the second desuperheating water volume update value. If it is determined that both the primary and secondary desuperheating water volumes have reached their respective maximum values, or both have reached their respective minimum values, then a corresponding prompt message is generated, including: If it is determined that both the primary and secondary desuperheating water volumes have reached their respective maximum values, a first prompt message will be generated indicating that the desuperheating water volume cannot be further adjusted due to high temperature. If it is determined that both the primary and secondary cooling water volumes have reached their respective minimum values, a second prompt message will be generated indicating that the cooling water volume cannot be further adjusted due to low temperature.

2. The method for controlling the desuperheating water volume according to claim 1, characterized in that, The desuperheating water volume control method also includes: If it is determined that the secondary cooling water volume is equal to the maximum value of the secondary cooling water volume, a first prompt message is generated indicating that the cooling water volume cannot be further adjusted due to high temperature.

3. The method for controlling the desuperheating water volume according to claim 2, characterized in that, The desuperheating water volume control method also includes: If it is determined that the first cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the first preset percentage, then the first cooling water volume update value is directly updated to the first-level cooling water volume maximum value. If it is determined that the second cooling water volume update value reaches the product of the maximum secondary cooling water volume and the first preset percentage, then the second cooling water volume update value is directly updated to the maximum secondary cooling water volume.

4. The method for controlling the desuperheating water volume according to claim 1, characterized in that, The step of determining the desuperheating water volume control strategy based on the difference includes: If it is determined that the difference is less than the second preset temperature threshold and the secondary cooling water volume is greater than the minimum secondary cooling water volume, then the third average value of the secondary cooling water volume and the minimum secondary cooling water volume is calculated. The third average value is used as the third desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the third desuperheating water volume update value.

5. The method for controlling the amount of desuperheating water according to claim 4, characterized in that, The step of determining the desuperheating water volume control strategy based on the difference further includes: If it is determined that the difference is less than the second preset temperature threshold, and the secondary cooling water volume is equal to the minimum secondary cooling water volume, then the primary cooling water volume is compared with the minimum primary cooling water volume. If it is determined that the first-stage desuperheating water volume is greater than the minimum first-stage desuperheating water volume, then calculate the fourth average value of the first-stage desuperheating water volume and the minimum first-stage desuperheating water volume; The fourth average value is used as the fourth desuperheating water volume update value, and the difference between the calculated main steam temperature and the design main steam temperature is calculated based on the fourth desuperheating water volume update value.

6. The method for controlling the desuperheating water volume according to claim 5, characterized in that, The desuperheating water volume control method also includes: If it is determined that the first-stage cooling water volume is equal to the minimum value of the first-stage cooling water volume, a second prompt message is generated indicating that the cooling water volume cannot be further adjusted due to the low temperature.

7. The method for controlling the desuperheating water volume according to claim 6, characterized in that, The desuperheating water volume control method also includes: If it is determined that the third cooling water volume update value reaches the product of the maximum value of the secondary cooling water volume and the second preset percentage, then the third cooling water volume update value is directly updated to the minimum value of the secondary cooling water volume. If it is determined that the fourth cooling water volume update value reaches the product of the first-level cooling water volume maximum value and the second preset percentage, then the fourth cooling water volume update value is directly updated to the first-level cooling water volume minimum value.

8. A desuperheating water volume control device, characterized in that, For implementing the desuperheating water volume control method according to any one of claims 1 to 7, the apparatus comprises: The determining unit is used to calculate the difference between the calculated value of the main steam temperature and the design value of the main steam temperature, and to determine the desuperheating water volume control strategy based on the difference; The monitoring unit is used to monitor the primary cooling water volume and the secondary cooling water volume during the process of controlling the cooling water volume according to the cooling water volume control strategy. The generation unit is used to generate a corresponding prompt message and perform air preheater thermal calculations if it is determined that the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective maximum values, or the primary desuperheating water volume and the secondary desuperheating water volume have both reached their respective minimum values.

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, it implements the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of any one of claims 1 to 7.

11. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 7.

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