CN116357954A - Method, device, medium and equipment for controlling circulating water system of low-pressure economizer - Google Patents

Method, device, medium and equipment for controlling circulating water system of low-pressure economizer Download PDF

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Publication number
CN116357954A
CN116357954A CN202310316334.9A CN202310316334A CN116357954A CN 116357954 A CN116357954 A CN 116357954A CN 202310316334 A CN202310316334 A CN 202310316334A CN 116357954 A CN116357954 A CN 116357954A
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China
Prior art keywords
regulating valve
opening
low
change rate
pressure economizer
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Inventor
桑伟逢
王亚平
赵楠
原辉
于彪
刘槟赫
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Guoneng Guohua Beijing Gas Thermal Power Co ltd
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Guoneng Guohua Beijing Gas Thermal Power Co ltd
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Priority to CN202310316334.9A priority Critical patent/CN116357954A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/003—Feed-water heater systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

The disclosure relates to a circulating water system control method, device, medium and equipment of a low-pressure economizer. The circulating water system comprises 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 pipeline inside the low-pressure economizer is communicated to a pipeline converging point through a first passage inside the flue gas heat supply network heater, a circulating pump and a first regulating valve in sequence, the outlet of the condensate pump is communicated to the inlet of the pipeline inside the low-pressure economizer through the pipeline converging point, and a second passage inside the flue gas heat supply network heater is communicated to a heat supply network water circulating pipeline through a second regulating valve. The method comprises the following steps: acquiring the temperature of the outer wall of the low-pressure economizer; and adjusting 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 rates of the first regulating valve and the second regulating valve are not simultaneously larger than a preset change rate threshold value. In this way, the mutual interference of the two regulating valves in the regulation is reduced.

Description

Method, device, medium and equipment for controlling circulating water system of low-pressure economizer
Technical Field
The disclosure relates to the technical field of power plant control, in particular to a circulating water system control method, a device, a medium and equipment of a low-pressure economizer.
Background
When the waste heat boiler of the power plant is operated, the temperature of the flue gas at the outlet of the boiler is maintained at a higher temperature (for example, above 85 ℃) for a long time, and the control value (for example, 75 ℃) is far exceeded. If the energy of the flue gas is discharged without full utilization, energy waste is caused. A water-water heat exchanger is additionally arranged on a pipeline of a circulating water system of the low-pressure economizer, and the circulating water of the heat supply network is heated by utilizing the recirculated condensed water of the low-pressure economizer under the condition of ensuring that the heating surface of the low-pressure economizer is not corroded by dew condensation, so that the recycling of the flue gas waste heat is realized.
In the heat supply network water circulation pipeline, a regulating valve can be arranged for regulating the flow rate of the heat supply network circulating water so as to regulate the heat exchange speed of the heat supply network circulating water and the circulating water of the low-pressure economizer and further regulate the heat dissipation speed of the low-pressure economizer. And a regulating valve is also arranged on the pipeline of the circulating water of the low-pressure economizer and used for regulating the flow rate of the circulating water of the low-pressure economizer so as to regulate the temperature rise of the low-pressure economizer. The adjustment of these two valves can interfere with each other, making the timeliness and stability of the adjustment poor.
Disclosure of Invention
The purpose of the present disclosure is to provide a circulating water system control method, device, medium and equipment for a low-pressure economizer which is energy-saving, efficient and safe.
In order to achieve the above object, the present disclosure provides a circulating water system control method of a low pressure economizer. The circulating water system comprises a low-pressure economizer, a flue gas heat supply network heater, a circulating pump, a first regulating valve, a second regulating valve and a condensate pump, wherein an outlet of an internal pipeline of the low-pressure economizer is sequentially communicated with a pipeline collecting point through a first passage in the flue gas heat supply network heater, the circulating pump and the first regulating valve, an outlet of the condensate pump is communicated with an inlet of an internal pipeline of the low-pressure economizer through the pipeline collecting point, an inlet of the condensate pump is communicated with a steam discharge port of a steam turbine through a condenser, a second passage in the flue gas heat supply network heater is communicated with a heat supply network water circulating pipeline through the second regulating valve, and circulating water in the first passage and the second passage in the flue gas heat supply network heater is subjected to heat exchange.
The method comprises the following steps:
acquiring the temperature of the outer wall of the low-pressure economizer;
and adjusting control parameters of a first Proportional Integral Derivative (PID) controller and control parameters of a 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 opening change rate of the second regulating valve are different and larger than a preset change rate threshold, wherein the first PID controller is used for controlling 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 preset temperature threshold, and the second PID controller is used for controlling 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.
Optionally, the adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer includes:
and under the condition that the temperature of the outer wall of the low-pressure economizer is higher than the temperature threshold, adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve is larger than the preset change rate threshold until a preset first opening is reached, and simultaneously adjusting parameters of the first PID controller so that the opening change rate of the first regulating valve is smaller than the preset change rate threshold until a preset second opening is reached.
Optionally, the adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer includes:
and under the condition that the temperature of the outer wall of the low-pressure economizer is higher than the temperature threshold, if the opening change rate of the first regulating valve is smaller than the preset change rate threshold, adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve is larger than the preset change rate threshold until the opening of the second regulating valve reaches a preset first opening, and adjusting parameters of the first PID controller so that the opening change rate of the first regulating valve is larger than the preset change rate threshold until the opening of the second regulating valve reaches a preset second opening.
Optionally, the adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer includes:
and under the condition that the temperature of the outer wall of the low-pressure economizer is lower than the temperature threshold, adjusting parameters of the first PID controller so that the opening change rate of the first regulating valve is larger than the preset change rate threshold until a preset third opening is reached, and simultaneously adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve is smaller than the preset change rate threshold until a preset fourth opening is reached.
Optionally, the adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer includes:
and under the condition that the temperature of the outer wall of the low-pressure economizer is lower than the temperature threshold, if the opening change rate of the second regulating valve is smaller than the preset change rate threshold, adjusting parameters of the first PID controller so that the opening change rate of the first regulating valve is larger than the preset change rate threshold until the opening of the first regulating valve reaches a preset third opening, and adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve is larger than the preset change rate threshold until a preset fourth opening is reached.
The disclosure also provides a circulating water system control device of the low-pressure economizer. The circulating water system comprises a low-pressure economizer, a flue gas heat supply network heater, a circulating pump, a first regulating valve, a second regulating valve and a condensate pump, wherein an outlet of an internal pipeline of the low-pressure economizer is sequentially communicated with a pipeline collecting point through a first passage in the flue gas heat supply network heater, the circulating pump and the first regulating valve, an outlet of the condensate pump is communicated with an inlet of an internal pipeline of the low-pressure economizer through the pipeline collecting point, an inlet of the condensate pump is communicated with a steam discharge port of a steam turbine through a condenser, a second passage in the flue gas heat supply network heater is communicated with a heat supply network water circulating pipeline through the second regulating valve, and circulating water in the first passage and the second passage in the flue gas heat supply network heater is subjected to heat exchange.
The device comprises:
the acquisition module is used for acquiring the temperature of the outer wall of the low-pressure economizer;
the adjusting module is used for adjusting the control parameters of a first Proportional Integral Derivative (PID) controller and the control parameters of a 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 opening change rate of the second regulating valve are different and larger than a preset change rate threshold, wherein the first PID controller is used for controlling 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 preset temperature threshold, and the second PID controller is used for controlling 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.
Optionally, the adjusting module includes:
and the first adjusting submodule is used for adjusting the parameters of the second PID controller under the condition that the temperature of the outer wall of the low-pressure economizer is higher than the temperature threshold value, so that the opening change rate of the second regulating valve is larger than the preset change rate threshold value until the preset first opening is reached, and simultaneously adjusting the parameters of the first PID controller, so that the opening change rate of the first regulating valve is smaller than the preset change rate threshold value until the preset second opening is reached.
Optionally, the adjusting module includes:
and the second adjusting submodule is used for adjusting the parameters of the second PID controller if the opening change rate of the first regulating valve is smaller than the preset change rate threshold value under the condition that the temperature of the outer wall of the low-pressure economizer is higher than the temperature threshold value, so that the opening change rate of the second regulating valve is larger than the preset change rate threshold value until the opening of the second regulating valve reaches the preset first opening, and adjusting the parameters of the first PID controller until the opening change rate of the first regulating valve is larger than the preset change rate threshold value until the preset second opening is reached.
The present disclosure also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described method provided by the present disclosure.
The present disclosure also provides an electronic device, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the above method provided by the present disclosure.
Through the technical scheme, the opening degrees of the first regulating valve in the pipeline of the circulating water of the low-pressure economizer and the second regulating valve in the water circulating pipeline of the heat supply network are respectively controlled by the PID controller, so that the temperature of the outer wall of the low-pressure economizer is maintained within a proper temperature range. In the process, the control parameters of the first PID controller and the control parameters of 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 larger than a preset change rate threshold value at the same time. Therefore, on the basis of guaranteeing the wall temperature stability of the low-pressure economizer, the mutual interference of the first regulating valve and the second regulating valve during regulation is reduced, and the timeliness and stability of regulation are good.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic view of a circulation water system of a low pressure economizer according to an exemplary embodiment.
Fig. 2 is a flowchart of a method of controlling a circulating water system of a low pressure economizer according to an exemplary embodiment.
Fig. 3 is a block diagram of a circulating water system control apparatus of a low pressure economizer provided according to an exemplary embodiment.
Fig. 4 is a block diagram of an electronic device, according to an example embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.
Fig. 1 is a schematic view of a circulation water system of a low pressure economizer according to an exemplary embodiment. As shown in fig. 1, the circulating water system 10 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 1a of the internal pipeline of the low-pressure economizer 1 is sequentially communicated to a pipeline converging point 7 through a first passage 2a, a circulating pump 3 and a first regulating valve 4 in the flue gas heat supply network heater 2, the outlet of a condensate pump 6 is communicated to an inlet 1b of the internal pipeline of the low-pressure economizer 1 through the pipeline converging point 7, the inlet of the condensate pump 6 is communicated with a steam discharge port of a steam turbine through a condenser, a second passage 2b in the flue gas heat supply network heater 2 is communicated to a heat supply network water circulating pipeline through a second regulating valve 5, and circulating water in the first passage 2a and the second passage 2b in the flue gas heat supply network heater 2 is subjected to heat exchange.
As shown in fig. 1, the low-pressure economizer circulation water line is formed in the direction indicated by the arrow from the outlet 1a of the internal line of the low-pressure economizer 1 to the inlet 1b of the internal line of the low-pressure economizer 1 via the first passage 2a, the circulation pump 3, the first regulating valve 4, and the line junction 7 in the flue gas heat supply network heater 2 in this order. The second passage 2b inside the flue gas heating network heater 2 is connected to the heating network water circulation pipeline via a second regulating valve 5. In the flue gas heat supply network heater 2, circulating water in a low-pressure economizer circulating water pipeline and a heat supply network water circulating pipeline are subjected to heat exchange, and the low-pressure economizer circulating condensation water is utilized to heat the heat supply network circulating water, so that the recycling of flue gas waste heat is realized.
The first regulating valve 4 is a regulating valve in the low-pressure economizer circulating water line. The flue gas (e.g., 133 ℃) which flows out from the outlet 1a of the internal pipeline of the low-pressure economizer 1 and has a relatively high temperature 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., lowers the temperature from 124 ℃ to 105 ℃), is mixed with the circulating water (e.g., 39 ℃) which flows out from the condensate pump 6 at the pipeline confluence point 7 after passing through the circulating pump 3 (e.g., lowers the temperature to 90 ℃), flows into the low-pressure economizer 1 through the inlet 1b (e.g., lowers the temperature to 70 ℃) of the internal pipeline of the low-pressure economizer 1, and is raised in temperature (e.g., raised to 133 ℃) inside the low-pressure economizer 1 and flows out.
The second regulating valve 5 is a regulating valve in the water circulation line of the heat supply network. For example, the circulating water in the heat-supply-network water circulation line (for example, 56.8 ℃) flows into the second passage 2b in the flue gas heat-supply-network heater 2, is warmed up by heat exchange (for example, is warmed up to 90 ℃), flows out of the second passage 2b, and flows into the heat-supply-network water circulation line through the second regulating valve 5.
If the wall temperature of the low-pressure economizer 1 is too low, condensate water is generated, and certain damage is caused to the low-pressure economizer 1, at this time, the temperature of circulating water in the circulating water pipeline of the low-pressure economizer can be increased by increasing the opening of the first regulating valve 4 and/or reducing the opening of the second regulating valve 5, so that the wall temperature of the low-pressure economizer 1 is increased. 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 circulating water pipeline of the low-pressure economizer and the circulating water in the water circulating pipeline of the heat supply network can be increased by increasing the opening of the second regulating valve 5 and/or reducing the opening of the first regulating valve 4, so that the heat utilization rate is increased. If the opening degrees of the first regulating valve 4 and the second regulating valve 5 are simultaneously regulated, mutual interference can occur, so that the timeliness and stability of regulation are poor.
Fig. 2 is a flowchart of a method of controlling a circulating water system of a low pressure economizer according to an exemplary embodiment. As shown in fig. 2, the method may include the following steps.
Step S101, obtaining the outer wall temperature of the low-pressure economizer 1.
Step S102, adjusting the control parameters of the first proportional integral derivative PID controller and the control parameters of 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 larger than a preset change rate threshold value.
Wherein the first PID controller is used for controlling the opening degree of the first regulating valve 4 according to the acquired outer wall temperature so as to enable the outer wall temperature of the low-pressure economizer 1 to be towards a preset temperature threshold value, and the second PID controller is used for controlling the opening degree of the second regulating valve 5 according to the acquired outer wall temperature so as to enable the outer wall temperature of the low-pressure economizer 1 to be towards the temperature threshold value.
In the first PID controller and the second PID controller, the regulated quantity is the actual value of the wall temperature of the low-pressure economizer, the input value is a temperature threshold value (better wall temperature), and the output value is the opening degree of a regulating valve. The control parameters of the first and second PID controllers include a proportional coefficient, a derivative coefficient, and an integral coefficient. The change rate of the opening of the first regulating valve 4 can be regulated by regulating each coefficient of the first PID controller, and the change rate of the opening of the second regulating valve 5 can be regulated by regulating each coefficient of the second PID controller.
For example, when the deviation of the current wall temperature of the low-pressure economizer from the temperature threshold is negative, the safety of the low-pressure economizer is affected, and the larger the absolute value of the deviation is, the faster (the rate of change of the opening degree is greater than the predetermined rate of change threshold) the first regulator valve 4 may be controlled to open, and the opening degree of the second regulator valve 5 may be fixed. When the deviation is positive, the safety is not affected, the heat supply of the flue gas heat supply network is abundant, the opening degree of the first regulating valve 4 can be fixed, the larger the absolute value of the deviation is, the faster the second regulating valve 5 can be controlled to be opened (the change rate of the opening degree is larger than a preset change rate threshold value), and more heat is output for the water circulation pipeline of the heat supply network, so that the economical efficiency is increased.
Through the technical scheme, the opening degrees of the first regulating valve in the pipeline of the circulating water of the low-pressure economizer and the second regulating valve in the water circulating pipeline of the heat supply network are respectively controlled by the PID controller, so that the temperature of the outer wall of the low-pressure economizer is maintained within a proper temperature range. In the process, the control parameters of the first PID controller and the control parameters of 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 larger than a preset change rate threshold value at the same time. Therefore, on the basis of guaranteeing the wall temperature stability of the low-pressure economizer, the mutual interference of the first regulating valve and the second regulating valve during regulation is reduced, and the timeliness and stability of regulation are good.
In still another embodiment, adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer 1 may include:
when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold value, the parameters of the second PID controller are adjusted so that the opening rate of the second regulating valve 5 is greater than the predetermined change rate threshold value until a predetermined first opening is reached, and the parameters of the first PID controller are adjusted so that the opening rate of the first regulating valve 4 is less than the predetermined change rate threshold value until a predetermined second opening is reached.
That is, in the case where the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold value, the utilization rate of the flue gas waste heat is rapidly increased mainly by increasing the opening degree of the second regulating valve 5, while at the same time the first regulating valve 4 is controlled to decrease the opening degree at a smaller rate until the opening degree of the second regulating valve 5 is increased to the first opening degree and the opening degree of the first regulating valve 4 is decreased to the second opening degree. The first opening degree and the second opening degree are predetermined opening degrees, for example, 90% and 10%, respectively.
In this embodiment, under the condition that the temperature of the outer wall of the low-pressure economizer 1 is higher than the temperature threshold value, the opening change rate of the second regulating valve 5 and the opening change rate of the first regulating valve 4 are controlled simultaneously, so that better utilization of the flue gas waste heat is realized.
In still another embodiment, adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer 1 may include:
when the outer wall temperature of the low-pressure economizer 1 is higher than the temperature threshold, if the opening rate of the first regulating valve 4 is smaller than the predetermined change rate threshold, the parameter of the second PID controller is adjusted so that the opening rate of the second regulating valve 5 is larger than the predetermined change rate threshold until the opening of the second regulating valve 5 reaches the predetermined first opening, and the parameter of the first PID controller is adjusted so that the opening rate of the first regulating valve 4 is larger than the predetermined change rate threshold until the predetermined second opening is reached.
In this embodiment, when the temperature of the outer wall of the low-pressure economizer 1 is higher than the temperature threshold, the opening rate of the second regulating valve 5 is controlled to be larger than the predetermined change rate threshold to increase the opening of the second regulating valve 5, and when the second regulating valve 5 reaches the predetermined first opening, the opening rate of the first regulating valve 4 is controlled to be larger than the predetermined change rate threshold to decrease the opening of the first regulating valve 4, so that the stability of system regulation is better.
In still another embodiment, adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer 1 may include:
when the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold value, the parameters of the first PID controller are adjusted so that the opening rate of the first regulating valve 4 is greater than a predetermined rate threshold value until a predetermined third opening is reached, while the parameters of the second PID controller are adjusted so that the opening rate of the second regulating valve 5 is less than a predetermined rate threshold value until a predetermined fourth opening is reached.
That is, in the case that the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold value, the utilization rate of the flue gas waste heat is rapidly increased mainly by increasing the opening degree of the first regulating valve 4, while at the same time the second regulating valve 5 is controlled to decrease the opening degree at a smaller rate until the opening degree of the first regulating valve 4 is increased to the third opening degree and the opening degree of the second regulating valve 5 is decreased to the fourth opening degree. The third opening degree and the fourth opening degree are predetermined opening degrees, for example, 90% and 10%, respectively.
In this embodiment, when the temperature of the outer wall of the low-pressure economizer 1 is lower than the temperature threshold, the opening rate of the second regulating valve 5 and the opening rate of the first regulating valve 4 are controlled simultaneously, so that the temperature of the outer wall of the low-pressure economizer 1 increases rapidly, and the safety of the system is better.
In still another embodiment, adjusting the control parameter of the first proportional integral derivative PID controller and the control parameter of the second PID controller according to the outer wall temperature of the low pressure economizer 1 may include:
when the outer wall temperature of the low-pressure economizer 1 is lower than the temperature threshold, if the opening rate of the second regulating valve 5 is smaller than the predetermined change rate threshold, the parameter of the first PID controller is adjusted so that the opening rate of the first regulating valve 4 is larger than the predetermined change rate threshold until the opening of the first regulating valve 4 reaches the predetermined third opening, and the parameter of the second PID controller is adjusted so that the opening rate of the second regulating valve 5 is larger than the predetermined change rate threshold until the predetermined fourth opening is reached.
In this embodiment, when the temperature of the outer wall of the low-pressure economizer 1 is lower than the temperature threshold, the opening rate of the first regulating valve 4 is controlled to be larger than the predetermined change rate threshold to increase the opening of the first regulating valve 4, and when the first regulating valve 4 reaches the predetermined third opening, the opening rate of the second regulating valve 5 is controlled to be larger than the predetermined change rate threshold to decrease the opening of the second regulating valve 5, so that the stability of system regulation is better.
Based on the same inventive concept, the disclosure also provides a circulating water system control device of the low-pressure economizer. As shown in fig. 1, the circulating water system 10 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, wherein an outlet 1a of an internal pipeline of the low-pressure economizer 1 is sequentially communicated to a pipeline collecting point 7 through a first passage 2a in the flue gas heating network heater 2, the circulating pump 3 and the first regulating valve 4, an outlet of the condensate pump 6 is communicated to an inlet 1b of an internal pipeline of the low-pressure economizer 1 through the pipeline collecting point 7, an inlet of the condensate pump 6 is communicated with a steam discharge port of a steam turbine through a condenser, a second passage 2b in the flue gas heating network heater 2 is communicated to a heat network water circulating pipeline through a second regulating valve 5, and circulating water in the first passage 2a and the second passage 2b in the flue gas heating network heater 2 is subjected to heat exchange.
Fig. 3 is a block diagram of a circulating water system control apparatus of a low pressure economizer provided according to an exemplary embodiment. As shown in fig. 3, the circulating water system control device 300 of the low-pressure economizer includes an acquisition module 301 and an adjustment module 302.
The acquisition module 301 is used for acquiring the outer wall temperature of the low-pressure economizer 1.
The adjusting module 302 is configured to adjust a control parameter of a first proportional integral derivative PID controller and a control parameter of a second PID controller according to an outer wall temperature of the low-pressure economizer 1, so that a change rate of an opening of the first regulating valve 4 and a change rate of an opening of the second regulating valve 5 are different and larger than a predetermined change rate threshold, where the first PID controller is configured 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 approaches a predetermined temperature threshold, and the second PID controller is configured 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 approaches the temperature threshold.
Optionally, the adjustment module 302 includes a first adjustment sub-module.
The first adjusting submodule is used for adjusting parameters of the second PID controller when the temperature of the outer wall of the low-pressure economizer 1 is higher than a temperature threshold value, so that the opening change rate of the second regulating valve 5 is larger than a preset change rate threshold value until a preset first opening is reached, and simultaneously adjusting parameters of the first PID controller, so that the opening change rate of the first regulating valve 4 is smaller than the preset change rate threshold value until a preset second opening is reached.
Optionally, the adjustment module 302 includes a second adjustment sub-module.
The second adjusting submodule is configured to, when the temperature of the outer wall of the low-pressure economizer 1 is higher than the temperature threshold, adjust parameters of the second PID controller if the opening rate of the first adjusting valve 4 is smaller than the predetermined rate threshold, so that the opening rate of the second adjusting valve 5 is greater than the predetermined rate threshold, and adjust parameters of the first PID controller until the opening of the second adjusting valve 5 reaches the predetermined first opening, so that the opening rate of the first adjusting valve 4 is greater than the predetermined rate threshold, until the predetermined second opening is reached.
Optionally, the adjustment module 302 includes a third adjustment sub-module.
The third adjusting submodule is used for adjusting parameters of the first PID controller when the temperature of the outer wall of the low-pressure economizer 1 is lower than a temperature threshold value so that the opening change rate of the first regulating valve 4 is larger than a preset change rate threshold value until a preset third opening is reached, and simultaneously adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve 5 is smaller than the preset change rate threshold value until a preset fourth opening is reached.
Optionally, the adjustment module 302 includes a fourth adjustment sub-module.
The fourth adjusting submodule is configured to, when the temperature of the outer wall of the low-pressure economizer 1 is lower than the temperature threshold, adjust the parameter of the first PID controller if the opening rate of the second adjusting valve 5 is smaller than the predetermined rate threshold, so that the opening rate of the first adjusting valve 4 is greater than the predetermined rate threshold, and adjust the parameter of the second PID controller until the opening of the first adjusting valve 4 reaches the predetermined third opening, so that the opening rate of the second adjusting valve 5 is greater than the predetermined rate threshold, and until the predetermined fourth opening is reached.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Through the technical scheme, the opening degrees of the first regulating valve in the pipeline of the circulating water of the low-pressure economizer and the second regulating valve in the water circulating pipeline of the heat supply network are respectively controlled by the PID controller, so that the temperature of the outer wall of the low-pressure economizer is maintained within a proper temperature range. In the process, the control parameters of the first PID controller and the control parameters of 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 larger than a preset change rate threshold value at the same time. Therefore, on the basis of guaranteeing the wall temperature stability of the low-pressure economizer, the mutual interference of the first regulating valve and the second regulating valve during regulation is reduced, and the timeliness and stability of regulation are good.
The present disclosure also provides an electronic device comprising a memory and a processor, the memory having stored thereon a computer program; the processor is configured to execute the computer program in the memory to implement the steps of the above-described method provided by the present disclosure.
Fig. 4 is a block diagram of an electronic device 400, shown in accordance with an exemplary embodiment. As shown in fig. 4, the electronic device 400 may include: a processor 401, 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.
The processor 401 is configured to control the overall operation of the electronic device 400, so as to complete all or part of the steps in the method for controlling the circulating water system of the low-pressure economizer. The memory 402 is used to store various types of data to support operation at the electronic device 400, which may include, for example, instructions for any application or method operating on the electronic device 400, as well as application-related data, such as contact data, transceived messages, pictures, audio, video, and the like. The Memory 402 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 403 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 402 or transmitted through the communication component 405. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 404 provides an interface between the processor 401 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The 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 (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 405 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic device 400 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), digital signal processor (Digital Signal Processor, abbreviated as DSP), digital signal processing device (Digital Signal Processing Device, abbreviated as DSPD), programmable logic device (Programmable Logic Device, abbreviated as PLD), field programmable gate array (Field Programmable Gate Array, abbreviated as FPGA), controller, microcontroller, microprocessor, or other electronic component for performing the method of circulating water system control of the low-pressure economizer described above.
In another exemplary embodiment, a computer readable storage medium is also provided, which includes non-transitory program instructions that, when executed by a processor, implement the steps of the above-described method for controlling a circulating water system of a low-pressure economizer. For example, the computer readable storage medium may be the memory 402 including the program instructions described above, which are executable by the processor 401 of the electronic device 400 to perform the circulating water system control method of the low pressure economizer described above.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned method of controlling a circulating water system of a low-pressure economizer when being executed by the programmable apparatus.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. The circulating water system control method of the low-pressure economizer is characterized in that the circulating water system (10) comprises 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), wherein an outlet (1 a) of an internal pipeline of the low-pressure economizer (1) is communicated to a pipeline collecting point (7) through a first passage (2 a) in the flue gas heat network heater (2), the circulating pump (3) and the first regulating valve (4) in sequence, an outlet of the condensate pump (6) is communicated to an inlet (1 b) of an internal pipeline of the low-pressure economizer (1) through the pipeline collecting point (7), an inlet of the condensate pump (6) is communicated with a steam discharge port of a steam turbine through the condenser, a second passage (2 b) in the flue gas heat network heater (2) is communicated to a heat network water circulating pipeline through the second regulating valve (5), and the flue gas in the first passage (2 a) of the flue gas heat network heater (2) is subjected to heat exchange; the method comprises the following steps:
acquiring the temperature of the outer wall of the low-pressure economizer (1);
and adjusting control parameters of a first Proportional Integral Derivative (PID) controller and control parameters of a 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 different and larger than a preset change rate threshold, wherein the first PID controller is used for controlling 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 preset temperature threshold, and the second PID controller is used for controlling 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 according to claim 1, wherein said adjusting control parameters of a first proportional, integral and derivative PID controller and control parameters of a second PID controller according to an outer wall temperature of the low pressure economizer (1) comprises:
and under the condition that the temperature of the outer wall of the low-pressure economizer (1) is higher than the temperature threshold, adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve (5) is higher than the preset change rate threshold until a preset first opening is reached, and simultaneously adjusting parameters of the first PID controller so that the opening change rate of the first regulating valve (4) is lower than the preset change rate threshold until a preset second opening is reached.
3. The method according to claim 1, wherein said adjusting control parameters of a first proportional, integral and derivative PID controller and control parameters of a second PID controller according to an outer wall temperature of the low pressure economizer (1) comprises:
and 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 smaller than the preset change rate threshold, adjusting the parameters of the second PID controller so that the opening change rate of the second regulating valve (5) is larger than the preset change rate threshold until the opening of the second regulating valve (5) reaches a preset first opening, and adjusting the parameters of the first PID controller so that the opening change rate of the first regulating valve (4) is larger than the preset change rate threshold until the preset second opening is reached.
4. The method according to claim 1, wherein said adjusting control parameters of a first proportional, integral and derivative PID controller and control parameters of a second PID controller according to an outer wall temperature of the low pressure economizer (1) comprises:
and under the condition that the temperature of the outer wall of the low-pressure economizer (1) is lower than the temperature threshold value, adjusting parameters of the first PID controller so that the opening change rate of the first regulating valve (4) is larger than the preset change rate threshold value until a preset third opening is reached, and simultaneously adjusting parameters of the second PID controller so that the opening change rate of the second regulating valve (5) is smaller than the preset change rate threshold value until a preset fourth opening is reached.
5. The method according to claim 1, wherein said adjusting control parameters of a first proportional, integral and derivative PID controller and control parameters of a second PID controller according to an outer wall temperature of the low pressure economizer (1) comprises:
and under the condition that the temperature of the outer wall of the low-pressure economizer (1) is lower than the temperature threshold, if the opening change rate of the second regulating valve (5) is smaller than the preset change rate threshold, adjusting the parameters of the first PID controller so that the opening change rate of the first regulating valve (4) is larger than the preset change rate threshold until the opening of the first regulating valve (4) reaches a preset third opening, and adjusting the parameters of the second PID controller so that the opening change rate of the second regulating valve (5) is larger than the preset change rate threshold until a preset fourth opening is reached.
6. The circulating water system control device of the low-pressure economizer is characterized in that the circulating water system (10) comprises 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), wherein an outlet (1 a) of an internal pipeline of the low-pressure economizer (1) is communicated to a pipeline collecting point (7) through a first passage (2 a) in the flue gas heat network heater (2), the circulating pump (3) and the first regulating valve (4) in sequence, an outlet of the condensate pump (6) is communicated to an inlet (1 b) of an internal pipeline of the low-pressure economizer (1) through the pipeline collecting point (7), an inlet of the condensate pump (6) is communicated with a steam discharge port of a steam turbine through the condenser, a second passage (2 b) in the flue gas heat network heater (2) is communicated to a heat network water circulating pipeline through the second regulating valve (5), and the second passage (2 a) in the flue gas heat network (2) is subjected to heat exchange in the first passage (2 b); the device comprises:
the acquisition module is used for acquiring the outer wall temperature of the low-pressure economizer (1);
the adjusting module is used for adjusting control parameters of a first Proportional Integral Derivative (PID) controller and control parameters of a 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 different and larger than a preset change rate threshold, wherein the first PID controller is used for controlling 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 preset temperature threshold, and the second PID controller is used for controlling 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 comprises:
and the first adjusting submodule is used for adjusting parameters of the second PID controller under the condition that the temperature of the outer wall of the low-pressure economizer (1) is higher than the temperature threshold value, so that the opening change rate of the second regulating valve (5) is higher than the preset change rate threshold value until a preset first opening is reached, and simultaneously adjusting the parameters of the first PID controller, so that the opening change rate of the first regulating valve (4) is lower than the preset change rate threshold value until a preset second opening is reached.
8. The apparatus of claim 6, wherein the adjustment module comprises:
and the second adjusting submodule is used for adjusting parameters of the second PID controller if the opening change rate of the first regulating valve (4) is smaller than the preset change rate threshold value under the condition that the temperature of the outer wall of the low-pressure economizer (1) is higher than the temperature threshold value, so that the opening change rate of the second regulating valve (5) is larger than the preset change rate threshold value until the opening of the second regulating valve (5) reaches a preset first opening, and adjusting the parameters of the first PID controller until the opening change rate of the first regulating valve (4) is larger than the preset change rate threshold value until a preset second opening is reached.
9. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1-5.
10. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-5.
CN202310316334.9A 2023-03-28 2023-03-28 Method, device, medium and equipment for controlling circulating water system of low-pressure economizer Pending CN116357954A (en)

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CN202310316334.9A CN116357954A (en) 2023-03-28 2023-03-28 Method, device, medium and equipment for controlling circulating water system of low-pressure economizer

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Application Number Priority Date Filing Date Title
CN202310316334.9A CN116357954A (en) 2023-03-28 2023-03-28 Method, device, medium and equipment for controlling circulating water system of low-pressure economizer

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CN116357954A true CN116357954A (en) 2023-06-30

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