Control method and device for circulating water system of low-pressure economizer, medium and equipment

Abstract

This disclosure relates to a control method, apparatus, medium, and equipment for a circulating water system of a low-pressure economizer. The circulating water system includes a low-pressure economizer 1, a flue gas heating network heater 2, a circulating pump 3, a first regulating valve 4, a second regulating valve 5, and a condensate pump 6. The outlet of the internal pipeline of the low-pressure economizer is connected sequentially to a pipeline junction point via a first passage inside the flue gas heating network heater, the circulating pump, and the first regulating valve. The outlet of the condensate pump is connected to the inlet of the internal pipeline of the low-pressure economizer via the pipeline junction point. The second passage inside the flue gas heating network heater is connected to the heating network water circulation pipeline via the second regulating valve. The method includes: acquiring the outer wall temperature of the low-pressure economizer; adjusting the control parameters of the first PID controller and the second PID controller according to the outer wall temperature of the low-pressure economizer, so that the opening change rate of the first regulating valve and the second regulating valve are not simultaneously greater than a predetermined change rate threshold. This reduces the mutual interference when the two regulating valves are adjusting.

Description

Technical Field

[0001] This disclosure relates to the field of power plant control technology, and more specifically, to a method, apparatus, medium, and equipment for controlling the circulating water system of a low-pressure economizer. Background Technology

[0002] When a power plant's waste heat boiler is in operation, the flue gas temperature at the boiler outlet remains consistently high (e.g., above 85°C), far exceeding the control value (e.g., 75°C). If the flue gas energy is not fully utilized before being discharged, it results in energy waste. Typically, a water-to-water heat exchanger is installed on the circulating water system of the low-pressure economizer. While ensuring that the heating surfaces of the low-pressure economizer are not corroded by condensation, the recirculated condensate from the low-pressure economizer is used to heat the circulating water in the heating network, thus achieving the reuse of waste heat from the flue gas.

[0003] In the heating network water circulation pipeline, regulating valves can be installed to adjust the flow rate of the heating network circulating water, thereby adjusting the heat exchange rate between the heating network circulating water and the low-pressure economizer circulating water, and thus regulating the heat dissipation rate of the low-pressure economizer. Regulating valves are also installed on the low-pressure economizer circulating water pipeline to adjust the flow rate of the low-pressure economizer circulating water, thereby regulating the temperature rise of the low-pressure economizer. The adjustments of these two valves can interfere with each other, resulting in poor timeliness and stability of the regulation. Summary of the Invention

[0004] The purpose of this disclosure is to provide a method, apparatus, medium, and equipment for controlling the circulating water system of an energy-saving, efficient, and safe low-pressure economizer.

[0005] To achieve the above objectives, this disclosure provides a control method for the circulating water system of a low-pressure economizer. The circulating water system includes a low-pressure economizer, a flue gas heating network heater, a circulating pump, a first regulating valve, a second regulating valve, and a condensate pump. The outlet of the internal pipeline of the low-pressure economizer is sequentially connected to a pipeline junction point via a first passage inside the flue gas heating network heater, the circulating pump, and the first regulating valve. The outlet of the condensate pump is connected to the inlet of the internal pipeline of the low-pressure economizer via the pipeline junction point. The inlet of the condensate pump is connected to the exhaust port of the steam turbine via the condenser. The second passage inside the flue gas heating network heater is connected to the heating network water circulation pipeline via the second regulating valve. The circulating water in the first and second passages inside the flue gas heating network heater exchanges heat.

[0006] The method includes:

[0007] Obtain the outer wall temperature of the low-pressure economizer;

[0008] The control parameters of the first proportional-integral-derivative (PID) controller and the second PID controller are adjusted according to the outer wall temperature of the low-pressure economizer, so that the opening change rate of the first regulating valve and the opening change rate of the second regulating valve are not simultaneously greater than a predetermined change rate threshold. The first PID controller is used to control the opening of the first regulating valve according to the acquired outer wall temperature, so that the outer wall temperature of the low-pressure economizer tends to the predetermined temperature threshold. The second PID controller is used to control the opening of the second regulating valve according to the acquired outer wall temperature, so that the outer wall temperature of the low-pressure economizer tends to the temperature threshold.

[0009] Optionally, adjusting the control parameters of the first proportional-integral-derivative PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer includes:

[0010] When the outer wall temperature of the low-pressure economizer is higher than the temperature threshold, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve is greater than the predetermined change rate threshold until a predetermined first opening is reached. At the same time, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve is less than the predetermined change rate threshold until a predetermined second opening is reached.

[0011] Optionally, adjusting the control parameters of the first proportional-integral-derivative PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer includes:

[0012] If the outer wall temperature of the low-pressure economizer is higher than the temperature threshold, and the opening change rate of the first regulating valve is less than the predetermined change rate threshold, then the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve is greater than the predetermined change rate threshold, until the opening of the second regulating valve reaches a predetermined first opening. Then the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve is greater than the predetermined change rate threshold, until a predetermined second opening is reached.

[0013] Optionally, adjusting the control parameters of the first proportional-integral-derivative PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer includes:

[0014] When the outer wall temperature of the low-pressure economizer is lower than the temperature threshold, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve is greater than the predetermined change rate threshold until a predetermined third opening is reached. At the same time, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve is less than the predetermined change rate threshold until a predetermined fourth opening is reached.

[0015] Optionally, adjusting the control parameters of the first proportional-integral-derivative PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer includes:

[0016] If the outer wall temperature of the low-pressure economizer is lower than the temperature threshold, and the opening change rate of the second regulating valve is less than the predetermined change rate threshold, then the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve is greater than the predetermined change rate threshold, until the opening of the first regulating valve reaches a predetermined third opening. Then the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve is greater than the predetermined change rate threshold, until a predetermined fourth opening is reached.

[0017] This disclosure also provides a control device for the circulating water system of a low-pressure economizer. The circulating water system includes a low-pressure economizer, a flue gas heating network heater, a circulating pump, a first regulating valve, a second regulating valve, and a condensate pump. The outlet of the internal pipeline of the low-pressure economizer is sequentially connected to a pipeline junction point via a first passage inside the flue gas heating network heater, the circulating pump, and the first regulating valve. The outlet of the condensate pump is connected to the inlet of the internal pipeline of the low-pressure economizer via the pipeline junction point. The inlet of the condensate pump is connected to the exhaust port of the steam turbine via the condenser. The second passage inside the flue gas heating network heater is connected to the heating network water circulation pipeline via the second regulating valve. The circulating water in the first and second passages inside the flue gas heating network heater exchanges heat.

[0018] The device includes:

[0019] The acquisition module is used to acquire the outer wall temperature of the low-pressure economizer;

[0020] An adjustment module is used to adjust the control parameters of a first proportional-integral-derivative (PID) controller and a second PID controller based on the outer wall temperature of the low-pressure economizer, so that the opening change rate of the first regulating valve and the opening change rate of the second regulating valve do not simultaneously exceed a predetermined change rate threshold. The first PID controller controls the opening of the first regulating valve based on the acquired outer wall temperature to make the outer wall temperature of the low-pressure economizer tend towards the predetermined temperature threshold. The second PID controller controls the opening of the second regulating valve based on the acquired outer wall temperature to make the outer wall temperature of the low-pressure economizer tend towards the temperature threshold.

[0021] Optionally, the adjustment module includes:

[0022] The first adjustment submodule is used to adjust the parameters of the second PID controller when the outer wall temperature of the low-pressure economizer is higher than the temperature threshold, so that the opening change rate of the second regulating valve is greater than the predetermined change rate threshold until a predetermined first opening is reached. At the same time, the first PID controller is adjusted to make the opening change rate of the first regulating valve less than the predetermined change rate threshold until a predetermined second opening is reached.

[0023] Optionally, the adjustment module includes:

[0024] The second adjustment submodule is used to adjust the parameters of the second PID controller when the outer wall temperature of the low-pressure economizer is higher than the temperature threshold, and if the opening change rate of the first regulating valve is less than the predetermined change rate threshold, so that the opening change rate of the second regulating valve is greater than the predetermined change rate threshold, until the opening of the second regulating valve reaches a predetermined first opening, and then adjust the parameters of the first PID controller so that the opening change rate of the first regulating valve is greater than the predetermined change rate threshold, until a predetermined second opening is reached.

[0025] This disclosure also provides a non-transitory computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the methods described above provided in this disclosure.

[0026] This disclosure also provides an electronic device, including:

[0027] A memory on which computer programs are stored;

[0028] A processor is configured to execute the computer program in the memory to implement the steps of the method described above provided in this disclosure.

[0029] The above technical solution utilizes PID controllers to control the opening of the first regulating valve in the low-pressure economizer circulating water pipeline and the second regulating valve in the heating network water circulating pipeline, respectively, to maintain the outer wall temperature of the low-pressure economizer within a suitable temperature range. During this process, the control parameters of the first and second PID controllers are adjusted based on the outer wall temperature of the low-pressure economizer, ensuring that the rate of change of the opening of the first and second regulating valves does not simultaneously exceed a predetermined threshold. This approach, while ensuring stable wall temperature of the low-pressure economizer, reduces mutual interference between the first and second regulating valves during adjustment, resulting in better timeliness and stability of the adjustment.

[0030] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the circulating water system of a low-pressure economizer according to an exemplary embodiment.

[0033] Figure 2 This is a flowchart of a circulating water system control method for a low-pressure economizer according to an exemplary embodiment.

[0034] Figure 3 This is a block diagram of a circulating water system control device for a low-pressure economizer according to an exemplary embodiment.

[0035] Figure 4 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Detailed Implementation

[0036] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0037] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0038] Figure 1 This is a schematic diagram of the circulating water system of a low-pressure economizer according to an exemplary embodiment. Figure 1As shown, the circulating water system 10 includes a low-pressure economizer 1, a flue gas heat network heater 2, a circulating pump 3, a first regulating valve 4, a second regulating valve 5, and a condensate pump 6. The outlet 1a of the internal pipeline of the low-pressure economizer 1 is connected sequentially to a pipeline junction point 7 via a first passage 2a inside the flue gas heat network heater 2, the circulating pump 3, and the first regulating valve 4. The outlet of the condensate pump 6 is connected to the inlet 1b of the internal pipeline of the low-pressure economizer 1 via the pipeline junction point 7. The inlet of the condensate pump 6 is connected to the exhaust port of the steam turbine via the condenser. The second passage 2b inside the flue gas heat network heater 2 is connected to the heat network water circulation pipeline via the second regulating valve 5. The circulating water in the first passage 2a and the second passage 2b inside the flue gas heat network heater 2 undergoes heat exchange.

[0039] like Figure 1 As shown, the pipeline from the outlet 1a of the internal pipeline of the low-pressure economizer 1 passes sequentially through the first passage 2a inside the flue gas heat network heater 2, the circulating pump 3, the first regulating valve 4, and the pipeline junction point 7, reaching the inlet 1b of the internal pipeline of the low-pressure economizer 1, forming the low-pressure economizer circulating water pipeline in the direction indicated by the arrow. The second passage 2b inside the flue gas heat network heater 2 is connected to the heat network water circulation pipeline via the second regulating valve 5. Inside the flue gas heat network heater 2, the circulating water in the low-pressure economizer circulating water pipeline and the heat network water circulation pipeline undergoes heat exchange, using the recirculated condensate from the low-pressure economizer to heat the heat network circulating water, thus realizing the reuse of flue gas waste heat.

[0040] The first regulating valve 4 is a regulating valve in the circulating water pipeline of the low-pressure economizer. High-temperature flue gas (e.g., 133°C) flows out from the outlet 1a of the internal pipeline of the low-pressure economizer 1, flows through the first passage 2a inside the flue gas heat network heater 2, exchanges heat with the circulating water in the second passage 2b (e.g., cools down from 124°C to 105°C), passes through the circulating pump 3 (e.g., cools down to 90°C), mixes with the circulating water (e.g., 39°C) flowing out from the condensate pump 6 at the pipeline junction 7, and flows into the low-pressure economizer 1 through the inlet 1b of the internal pipeline of the low-pressure economizer 1 (e.g., cools down to 70°C), heats up inside the low-pressure economizer 1 (e.g., heats up to 133°C), and flows out.

[0041] The second regulating valve 5 is a regulating valve in the heating network water circulation pipeline. For example, the circulating water in the heating network water circulation pipeline (e.g., 56.8°C) flows into the second passage 2b in the flue gas heating network heater 2, is heated by heat exchange (e.g., heated to 90°C), flows out of the second passage 2b, and then flows into the heating network water circulation pipeline through the second regulating valve 5.

[0042] If the wall temperature of the low-pressure economizer 1 is too low, condensate will be generated, causing some damage to the economizer 1. In this case, the temperature of the circulating water in the low-pressure economizer circulating water pipeline can be increased by increasing the opening of the first regulating valve 4 and / or decreasing the opening of the second regulating valve 5, thereby increasing the wall temperature of the low-pressure economizer 1. If the wall temperature of the low-pressure economizer 1 is too high, the heat exchange between the circulating water (or flue gas) in the low-pressure economizer circulating water pipeline and the circulating water in the heating network circulating water pipeline can be increased by increasing the opening of the second regulating valve 5 and / or decreasing the opening of the first regulating valve 4, thereby increasing the heat utilization rate. If the openings of the first regulating valve 4 and the second regulating valve 5 are adjusted simultaneously, they will interfere with each other, resulting in poor timeliness and stability of the adjustment.

[0043] Figure 2 This is a flowchart of a circulating water system control method for a low-pressure economizer according to an exemplary embodiment. Figure 2 As shown, the method may include the following steps.

[0044] Step S101: Obtain the outer wall temperature of the low-pressure economizer 1.

[0045] Step S102: Adjust the control parameters of the first proportional-integral-derivative PID controller and the second PID controller according to the outer wall temperature of the low-pressure economizer 1, so that the opening change rate of the first regulating valve 4 and the opening change rate of the second regulating valve 5 are not simultaneously greater than a predetermined change rate threshold.

[0046] The first PID controller is used to control the opening of the first regulating valve 4 according to the acquired outer wall temperature, so that the outer wall temperature of the low-pressure economizer 1 tends to a predetermined temperature threshold. The second PID controller is used to control the opening of the second regulating valve 5 according to the acquired outer wall temperature, so that the outer wall temperature of the low-pressure economizer 1 tends to a temperature threshold.

[0047] In the first and second PID controllers, the controlled variable is the actual value of the low-pressure economizer wall temperature, the input is the temperature threshold (optimal wall temperature), and the output value is the opening degree of the regulating valve. The control parameters of the first and second PID controllers include proportional coefficient, derivative coefficient, and integral coefficient. Adjusting the coefficients of the first PID controller can adjust the rate of change of the opening degree of the first regulating valve 4, and adjusting the coefficients of the second PID controller can adjust the rate of change of the opening degree of the second regulating valve 5.

[0048] For example, if the deviation between the current wall temperature and the temperature threshold of the low-pressure economizer is negative, it affects the safety of the low-pressure economizer. The larger the absolute value of the deviation, the faster the first regulating valve 4 can open (the rate of change of the opening is greater than the predetermined rate of change threshold), while the opening of the second regulating valve 5 can remain unchanged. When the deviation is positive, it does not affect safety and provides sufficient heat to the flue gas heating network. The opening of the first regulating valve 4 can remain unchanged, and the larger the absolute value of the deviation, the faster the second regulating valve 5 can open (the rate of change of the opening is greater than the predetermined rate of change threshold), outputting more heat to the heating network water circulation pipeline to increase economic efficiency.

[0049] The above technical solution utilizes PID controllers to control the opening of the first regulating valve in the low-pressure economizer circulating water pipeline and the second regulating valve in the heating network water circulating pipeline, respectively, to maintain the outer wall temperature of the low-pressure economizer within a suitable temperature range. During this process, the control parameters of the first and second PID controllers are adjusted based on the outer wall temperature of the low-pressure economizer, ensuring that the rate of change of the opening of the first and second regulating valves does not simultaneously exceed a predetermined threshold. This approach, while ensuring stable wall temperature of the low-pressure economizer, reduces mutual interference between the first and second regulating valves during adjustment, resulting in better timeliness and stability of the adjustment.

[0050] In yet another embodiment, adjusting the control parameters of the first proportional-integral-derivative (PID) controller and the second PID controller based on the outer wall temperature of the low-pressure economizer 1 may include:

[0051] When the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve 5 is greater than the predetermined change rate threshold until the predetermined first opening is reached. At the same time, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve 4 is less than the predetermined change rate threshold until the predetermined second opening is reached.

[0052] In other words, when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, the utilization rate of flue gas waste heat is rapidly increased mainly by increasing the opening of the second regulating valve 5, while simultaneously controlling the first regulating valve 4 to decrease its opening at a smaller rate until the opening of the second regulating valve 5 increases to the first opening and the opening of the first regulating valve 4 decreases to the second opening. The first and second openings are predetermined, for example, 90% and 10%, respectively.

[0053] In this embodiment, when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, the opening change rate of the second regulating valve 5 and the opening change rate of the first regulating valve 4 are controlled simultaneously to achieve better utilization of flue gas waste heat.

[0054] In yet another embodiment, adjusting the control parameters of the first proportional-integral-derivative (PID) controller and the second PID controller based on the outer wall temperature of the low-pressure economizer 1 may include:

[0055] If the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, and the opening change rate of the first regulating valve 4 is less than the predetermined change rate threshold, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve 5 is greater than the predetermined change rate threshold. This continues until the opening of the second regulating valve 5 reaches the predetermined first opening. Then, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve 4 is greater than the predetermined change rate threshold, until the predetermined second opening is reached.

[0056] The difference from the previous embodiment is that, in this embodiment, when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, the opening rate of the second regulating valve 5 is first controlled to be greater than the predetermined rate of change threshold to increase the opening of the second regulating valve 5. When the second regulating valve 5 reaches the predetermined first opening, the opening rate of the first regulating valve 4 is then controlled to be greater than the predetermined rate of change threshold to decrease the opening of the first regulating valve 4. The system regulation has better stability.

[0057] In yet another embodiment, adjusting the control parameters of the first proportional-integral-derivative (PID) controller and the second PID controller based on the outer wall temperature of the low-pressure economizer 1 may include:

[0058] When the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve 4 is greater than the predetermined change rate threshold until the predetermined third opening is reached. At the same time, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve 5 is less than the predetermined change rate threshold until the predetermined fourth opening is reached.

[0059] In other words, when the outer wall temperature of the low-pressure economizer 1 is below the temperature threshold, the utilization rate of flue gas waste heat is rapidly increased mainly by increasing the opening of the first regulating valve 4, while simultaneously controlling the second regulating valve 5 to decrease its opening at a smaller rate, until the opening of the first regulating valve 4 increases to the third opening and the opening of the second regulating valve 5 decreases to the fourth opening. The third and fourth openings are predetermined openings, for example, 90% and 10% respectively.

[0060] In this embodiment, when the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold, the opening change rate of the second regulating valve 5 and the opening change rate of the first regulating valve 4 are controlled simultaneously. The outer wall of the low-pressure economizer 1 heats up quickly, and the system has good safety.

[0061] In yet another embodiment, adjusting the control parameters of the first proportional-integral-derivative (PID) controller and the second PID controller based on the outer wall temperature of the low-pressure economizer 1 may include:

[0062] If the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold, and the opening change rate of the second regulating valve 5 is less than the predetermined change rate threshold, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve 4 is greater than the predetermined change rate threshold. When the opening of the first regulating valve 4 reaches the predetermined third opening, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve 5 is greater than the predetermined change rate threshold. This continues until the predetermined fourth opening is reached.

[0063] The difference from the previous embodiment is that, in this embodiment, when the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold, the opening rate of the first regulating valve 4 is first controlled to be greater than the predetermined rate of change threshold to increase the opening of the first regulating valve 4. When the first regulating valve 4 reaches the predetermined third opening, the opening rate of the second regulating valve 5 is then controlled to be greater than the predetermined rate of change threshold to decrease the opening of the second regulating valve 5. The system regulation has better stability.

[0064] Based on the same inventive concept, this disclosure also provides a control device for the circulating water system of a low-pressure economizer. For example... Figure 1 As shown, the circulating water system 10 includes a low-pressure economizer 1, a flue gas heat network heater 2, a circulating pump 3, a first regulating valve 4, a second regulating valve 5, and a condensate pump 6. The outlet 1a of the internal pipeline of the low-pressure economizer 1 is connected to the pipeline junction point 7 via the first passage 2a inside the flue gas heat network heater 2, the circulating pump 3, and the first regulating valve 4. The outlet of the condensate pump 6 is connected to the inlet 1b of the internal pipeline of the low-pressure economizer 1 via the pipeline junction point 7. The inlet of the condensate pump 6 is connected to the exhaust port of the steam turbine via the condenser. The second passage 2b inside the flue gas heat network heater 2 is connected to the heat network water circulation pipeline via the second regulating valve 5. The circulating water in the first passage 2a and the second passage 2b inside the flue gas heat network heater 2 undergoes heat exchange.

[0065] Figure 3 This is a block diagram of a circulating water system control device for a low-pressure economizer according to an exemplary embodiment. Figure 3 As shown, the circulating water system control device 300 of the low-pressure economizer includes an acquisition module 301 and an adjustment module 302.

[0066] The acquisition module 301 is used to acquire the outer wall temperature of the low-pressure economizer 1.

[0067] The adjustment module 302 is used to adjust the control parameters of the first proportional-integral-derivative PID controller and the second PID controller according to the outer wall temperature of the low-pressure economizer 1, so that the opening change rate of the first regulating valve 4 and the opening change rate of the second regulating valve 5 are not simultaneously greater than a predetermined change rate threshold. The first PID controller is used to control the opening of the first regulating valve 4 according to the acquired outer wall temperature, so that the outer wall temperature of the low-pressure economizer 1 tends to the predetermined temperature threshold. The second PID controller is used to control the opening of the second regulating valve 5 according to the acquired outer wall temperature, so that the outer wall temperature of the low-pressure economizer 1 tends to the temperature threshold.

[0068] Optionally, the adjustment module 302 includes a first adjustment submodule.

[0069] The first adjustment submodule is used to adjust the parameters of the second PID controller when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, so that the opening change rate of the second regulating valve 5 is greater than the predetermined change rate threshold until the predetermined first opening is reached. At the same time, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve 4 is less than the predetermined change rate threshold until the predetermined second opening is reached.

[0070] Optionally, the adjustment module 302 includes a second adjustment submodule.

[0071] The second adjustment submodule is used to adjust the parameters of the second PID controller when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold. If the opening change rate of the first regulating valve 4 is less than the predetermined change rate threshold, the second adjustment submodule will adjust the parameters of the first PID controller to make the opening change rate of the second regulating valve 5 greater than the predetermined change rate threshold until the opening of the second regulating valve 5 reaches the predetermined first opening. Then, the first adjustment submodule will adjust the parameters of the first PID controller to make the opening change rate of the first regulating valve 4 greater than the predetermined change rate threshold until the predetermined second opening is reached.

[0072] Optionally, adjustment module 302 includes a third adjustment submodule.

[0073] The third adjustment submodule is used to adjust the parameters of the first PID controller when the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold, so that the opening change rate of the first regulating valve 4 is greater than the predetermined change rate threshold until the predetermined third opening is reached. At the same time, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve 5 is less than the predetermined change rate threshold until the predetermined fourth opening is reached.

[0074] Optionally, adjustment module 302 includes a fourth adjustment submodule.

[0075] The fourth adjustment submodule is used to adjust the parameters of the first PID controller when the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold. If the opening change rate of the second regulating valve 5 is less than the predetermined change rate threshold, the adjustment will be made so that the opening change rate of the first regulating valve 4 is greater than the predetermined change rate threshold. This adjustment continues until the opening of the first regulating valve 4 reaches the predetermined third opening. Then, the adjustment will be made to adjust the parameters of the second PID controller so that the opening change rate of the second regulating valve 5 is greater than the predetermined change rate threshold, until the predetermined fourth opening is reached.

[0076] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0077] The above technical solution utilizes PID controllers to control the opening of the first regulating valve in the low-pressure economizer circulating water pipeline and the second regulating valve in the heating network water circulating pipeline, respectively, to maintain the outer wall temperature of the low-pressure economizer within a suitable temperature range. During this process, the control parameters of the first and second PID controllers are adjusted based on the outer wall temperature of the low-pressure economizer, ensuring that the rate of change of the opening of the first and second regulating valves does not simultaneously exceed a predetermined threshold. This approach, while ensuring stable wall temperature of the low-pressure economizer, reduces mutual interference between the first and second regulating valves during adjustment, resulting in better timeliness and stability of the adjustment.

[0078] This disclosure also provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory; the processor is used to execute the computer program in the memory to implement the steps of the method provided in this disclosure.

[0079] Figure 4 This is a block diagram illustrating an electronic device 400 according to an exemplary embodiment. Figure 4 As shown, the electronic device 400 may include a processor 401 and a memory 402. The electronic device 400 may also include one or more of a multimedia component 403, an input / output (I / O) interface 404, and a communication component 405.

[0080] The processor 401 controls the overall operation of the electronic device 400 to complete all or part of the steps in the circulating water system control method of the low-pressure economizer described above. The memory 402 stores various types of data to support the operation of the electronic device 400. This data may include, for example, instructions for any application or method operating on the electronic device 400, and application-related data such as contact data, sent and received messages, pictures, audio, video, etc. The memory 402 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. Multimedia component 403 may include a screen and an audio component. The screen may be, for example, a touchscreen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in memory 402 or transmitted via communication component 405. The audio component also includes at least one speaker for outputting audio signals. I / O interface 404 provides an interface between processor 401 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual or physical buttons. Communication component 405 is used for wired or wireless communication between the electronic device 400 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IoT, eMTC, or other 5G technologies, or combinations thereof, is not limited here. Therefore, the corresponding communication component 405 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0081] In an exemplary embodiment, the electronic device 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to execute the circulating water system control method of the low-pressure economizer described above.

[0082] In another exemplary embodiment, a non-transitory computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implements the steps of the circulating water system control method for the low-pressure economizer described above. For example, the computer-readable storage medium may be the memory 402 including program instructions described above, which may be executed by the processor 401 of the electronic device 400 to complete the circulating water system control method for the low-pressure economizer described above.

[0083] In another exemplary embodiment, a computer program product is also provided, which includes a computer program executable by a programmable device, the computer program having a code portion for performing the circulating water system control method of the low-pressure economizer described above when executed by the programmable device.

[0084] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0085] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0086] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A circulating water system control method for a low-pressure economizer, characterized by, The circulating water system (10) includes a low-pressure economizer (1), a flue gas heat network heater (2), a circulating pump (3), a first regulating valve (4), a second regulating valve (5), and a condensate pump (6). The outlet (1a) of the internal pipeline of the low-pressure economizer (1) is connected sequentially to a pipeline junction point (7) via a first passage (2a) inside the flue gas heat network heater (2), the circulating pump (3), and the first regulating valve (4). The outlet of the condensate pump (6) is connected to the inlet (1b) of the internal pipeline of the low-pressure economizer (1) via the pipeline junction point (7). The inlet of the condensate pump (6) is connected to the exhaust port of the steam turbine via the condenser. The second passage (2b) inside the flue gas heat network heater (2) is connected to the heat network water circulation pipeline via the second regulating valve (5). The circulating water in the first passage (2a) and the second passage (2b) inside the flue gas heat network heater (2) undergoes heat exchange. The method includes: Obtain the outer wall temperature of the low-pressure economizer (1); The control parameters of the first PID controller and the second PID controller are adjusted according to the outer wall temperature of the low-pressure economizer (1) so that the opening change rate of the first regulating valve (4) and the opening change rate of the second regulating valve (5) satisfy one of the following conditions: the opening change rate of the first regulating valve (4) is greater than a predetermined change rate threshold, and the opening change rate of the second regulating valve (5) is less than the change rate threshold; the opening change rate of the first regulating valve (4) is less than the change rate threshold, and the opening change rate of the second regulating valve (5) is greater than the change rate threshold; the opening change rate of the first regulating valve (4) is first greater than the change rate threshold. The rate of change threshold is such that the rate of change of the opening of the second regulating valve (5) is greater than the rate of change threshold; the rate of change of the opening of the second regulating valve (5) is greater than the rate of change threshold first, and the rate of change of the opening of the first regulating valve (4) is greater than the rate of change threshold afterward. In this case, the first PID controller is used to control the opening of the first regulating valve (4) according to the acquired outer wall temperature so that the outer wall temperature of the low-pressure economizer (1) tends to the predetermined temperature threshold. The second PID controller is used to control the opening of the second regulating valve (5) according to the acquired outer wall temperature so that the outer wall temperature of the low-pressure economizer (1) tends to the temperature threshold.

2. The method of claim 1, wherein, The adjustment of the control parameters of the first PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer (1) includes: When the outer wall temperature of the low-pressure economizer (1) is higher than the temperature threshold, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve (5) is greater than the predetermined change rate threshold until the predetermined first opening is reached. At the same time, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve (4) is less than the predetermined change rate threshold until the predetermined second opening is reached.

3. The method of claim 1, wherein, The adjustment of the control parameters of the first PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer (1) includes: If the outer wall temperature of the low-pressure economizer (1) is higher than the temperature threshold, and the opening change rate of the first regulating valve (4) is less than the predetermined change rate threshold, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve (5) is greater than the predetermined change rate threshold until the opening of the second regulating valve (5) reaches the predetermined first opening. Then, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve (4) is greater than the predetermined change rate threshold until the predetermined second opening is reached.

4. The method of claim 1, wherein, The adjustment of the control parameters of the first PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer (1) includes: When the outer wall temperature of the low-pressure economizer (1) is lower than the temperature threshold, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve (4) is greater than the predetermined change rate threshold until the predetermined third opening is reached. At the same time, the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve (5) is less than the predetermined change rate threshold until the predetermined fourth opening is reached.

5. The method of claim 1, wherein, The adjustment of the control parameters of the first PID controller and the second PID controller based on the outer wall temperature of the low-pressure economizer (1) includes: If the outer wall temperature of the low-pressure economizer (1) is lower than the temperature threshold, and the opening change rate of the second regulating valve (5) is less than the predetermined change rate threshold, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve (4) is greater than the predetermined change rate threshold until the opening of the first regulating valve (4) reaches the predetermined third opening. Then the parameters of the second PID controller are adjusted so that the opening change rate of the second regulating valve (5) is greater than the predetermined change rate threshold until the predetermined fourth opening is reached.

6. A circulating water system control device for a low-pressure economizer, characterized by The circulating water system (10) includes a low-pressure economizer (1), a flue gas heat network heater (2), a circulating pump (3), a first regulating valve (4), a second regulating valve (5), and a condensate pump (6). The outlet (1a) of the internal pipeline of the low-pressure economizer (1) is connected sequentially to a pipeline junction point (7) via a first passage (2a) inside the flue gas heat network heater (2), the circulating pump (3), and the first regulating valve (4). The outlet of the condensate pump (6) is connected to the inlet (1b) of the internal pipeline of the low-pressure economizer (1) via the pipeline junction point (7). The inlet of the condensate pump (6) is connected to the exhaust port of the steam turbine via the condenser. The second passage (2b) inside the flue gas heat network heater (2) is connected to the heat network water circulation pipeline via the second regulating valve (5). The circulating water in the first passage (2a) and the second passage (2b) inside the flue gas heat network heater (2) undergoes heat exchange. The device includes: The acquisition module is used to acquire the outer wall temperature of the low-pressure economizer (1); The adjustment module is used to adjust the control parameters of the first PID controller and the second PID controller according to the outer wall temperature of the low-pressure economizer (1), so that the opening change rate of the first regulating valve (4) and the opening change rate of the second regulating valve (5) satisfy one of the following conditions: the opening change rate of the first regulating valve (4) is greater than a predetermined change rate threshold, and the opening change rate of the second regulating valve (5) is less than the change rate threshold; the opening change rate of the first regulating valve (4) is less than the change rate threshold, and the opening change rate of the second regulating valve (5) is greater than the change rate threshold; the opening change rate of the first regulating valve (4) is greater than the change rate threshold; the opening change rate of the first regulating valve (4) is first... If the change rate is greater than the threshold, the opening change rate of the second regulating valve (5) is greater than the threshold; if the opening change of the second regulating valve (5) is greater than the threshold, the opening change rate of the first regulating valve (4) is greater than the threshold, wherein the first PID controller is used to control the opening of the first regulating valve (4) according to the acquired outer wall temperature so that the outer wall temperature of the low-pressure economizer (1) tends to the predetermined temperature threshold, and the second PID controller is used to control the opening of the second regulating valve (5) according to the acquired outer wall temperature so that the outer wall temperature of the low-pressure economizer (1) tends to the temperature threshold.

7. The apparatus of claim 6, wherein, The adjustment module includes: The first adjustment submodule is used to adjust the parameters of the second PID controller when the outer wall temperature of the low-pressure economizer (1) is higher than the temperature threshold, so that the opening change rate of the second regulating valve (5) is greater than the predetermined change rate threshold until a predetermined first opening is reached. At the same time, the parameters of the first PID controller are adjusted so that the opening change rate of the first regulating valve (4) is less than the predetermined change rate threshold until a predetermined second opening is reached.

8. The apparatus of claim 6, wherein, The adjustment module includes: The second adjustment submodule is used to adjust the parameters of the second PID controller when the opening change rate of the first regulating valve (4) is less than the predetermined change rate threshold when the outer wall temperature of the low-pressure economizer (1) is higher than the temperature threshold, so that the opening change rate of the second regulating valve (5) is greater than the predetermined change rate threshold, until the opening of the second regulating valve (5) reaches the predetermined first opening, and then adjust the parameters of the first PID controller so that the opening change rate of the first regulating valve (4) is greater than the predetermined change rate threshold, until the predetermined second opening is reached.

9. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-5.

10. An electronic device, comprising: include: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1-5.

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